mrwa sewerage standards

METHOD OF CONNECTION

DIRECT TO EXISTING SEWERAGE MAIN

TO SHAFT OF EXISTING MS or MC

PREFERENCETABLE 500-A: CONNECTIONS TO LIVE SEWERS. OPTIONS, REQUIREMENTS AND PREFERENCES

SITUATIONS OF USE AND COMMENTSDN100 & DN150 CONNECTIONS TO MAINS < 3.5m (PRIVATEPROPERTY) or < 4.0m DEEP (RD RESERVE OR PUBLIC OPEN SPACE)DN100 CONNECTION < 5m FROM EXISTING MS or MC

KEY REFERENCESTABLE 104A-A, MRWA-S-503

TABLE 104A-A, MRWA-S-305 & 306

TO SHAFT OR BASE OFEXISTING CONCRETE MH

TO BASE OF EXISTING PLASTICMAINTENANCE STRUCTURE

1

OFTEN DIFFICULT TO COMPLY WITH ALL MRWA-S-308REQUIREMENTS

TABLE 104A-A, MRWA-S-305, 306& 306B

2

ONLY IF UNUSED BASE INFLOW STUB IS CONFIRMED

HIGHLY FLEXIBLE SOLUTION WHERE MOST CONSTRUCTIONCAN USUALLY OCCUR WHILE THE SEWER REMAINS IN SERVICE

TABLE 104A-A, MRWA-S-307 to314, 508 & 510

TO BASE OR SHAFT OF NEWCONCRETE MH

3EXISTING FLOWS MUST BE CONTAINED DURINGCONSTRUCTION. SOMETIMES THE ONLY VIABLE SOLUTIONWHERE THERE IS LIMITED FOOTPRINT FOR A CONCRETE MH

TABLE 104A-A, MRWA-S-305,306, 306B & 512

TO BASE OF NEW PLASTIC STRUCTURE,OR SHAFT OF NEW PLASTIC MH

TABLE 104A-A, MRWA-S-308& 506

ACCEPTANCE TESTING REQUIREMENTS

PRESSURE / VACUUM TESTING NOTREQUIRED. VISUAL RECORD OF NEWCONNECTION (REFER TABLE 500-D).

PRESSURE / VACUUM TEST NEW CONNECTIONPIPEWORK IN THE SIGNED PRESENCE OF ANACCREDITED CONSULTANT OR WATERAGENCY AUDITOR, or

VISUAL RECORD OF NEW CONNECTION (REFERTABLE 500-D) AND STRUCTURE. THIS METHODIS TYPICALLY MORE PRACTICAL WHERE THEEXISTING ASSET IS IN POOR CONDITION

TABLE 500-D Notes:a. Still photographs shall be taken with a > 5MP pixel camera with sufficient light to ensure

images are clear whilst zoomed x10. Blurry and unclear images are not acceptable.b. All parts of a structure impacted by Live Sewer works shall be photographed so that all work

completed can be clearly observed.c. Still photograph the junction's internal bore by pointing the camera down the line of the

junction's offtake to verify that the full bore of the offtake is clear & unimpeded.d. Provide As Constructed visual records to Water Agency in accordance with their requirements.e. Where CCTV camera insertion is required, backfill as much of the new pipework as practical

while maintaining access to the end of pipe for CCTV camera insertion.At least one layer of backfill shall be placed over embedment up until 1m from end of pipe.Some CCTV footage of the backfilled pipe and extent of excavation shall be provided withinfootage of the pipe internals.

f. CCTV inspection shall be for the full length of new pipework.g. Push Rod CCTV camera reports shall list the size, type (crack, wrinkle, hole, gouge) and

severity of all defects (full WSA 05 report not required).h. Tractor CCTV report as per WSA 05, WSAA Conduit Inspection Reporting Code.

> DN150 & < 25m LONG

PUSH ROD CCTV PIPE INTERNALLY AFTER BACKFILL

STILL PHOTOGRAPH OF INTERNAL BORE OF JUNCTION &EXTERNAL PHOTOGRAPH OF EACH JOINT PRIOR TO BACKFILL

DN100 & > 3m LONG

RECORD REQUIREDSITUATIONTABLE 500-D: VISUAL RECORDING OF CONSTRUCTION

TRACTOR (CRAWLER) CCTV INTERNALLY AFTER BACKFILL> DN150 & > 25m LONG

DN100 & <3m LONG

PUSH ROD CCTV PIPE INTERNALLY AFTER BACKFILL

STILL PHOTOGRAPH(S) OF STRUCTURE INTERNALSSTRUCTURES

SIDE BOUNDARY

REAR BOUNDARY

DRIVEWAYDRIVEWAY

SIDE BOUNDARY

REAR BOUNDARY

DRIVEWAYDRIVEWAY

FRONT BOUNDARY

FIGURE 500-C1: BEFORE CONNECTION TO NEW STRUCTURE

FIGURE 500-C2: AFTER NEW MAINTENANCE STRUCTURE &CONNECTION & PIPE CONNECTION DECOMMISSIONING

FIGURE 500-D2: AFTER LARGERSTRUCTURE REPLACEMENT

FIGURE 500-D1: BEFORE ISREPLACEMENT

FIGURE 500-E2: AFTER LARGERSTRUCTURE REPLACEMENT

FIGURE 500-E1: BEFORE ISREPLACEMENT IN ROAD RESERVE

DRIVEWAY

DRIVEWAY

FRONT BOUNDARY

FIGURE 500-B1: BEFORE NEW PIPE CONNECTIONS

FIGURE 500-B2: AFTER NEW PIPE CONNECTIONS &REDUNDANT PIPE CONNECTION DECOMMISSIONING

NEW LIVE SEWERPIPE CONNECTION(REF MRWA-S-503)

NEW LIVE SEWERPIPE CONNECTION(REF MRWA-S-503)

DECOMMISSIONEDPROPERTY CONNECTION(REF MRWA-S-514)

NEW MAINTENANCESTRUCTURE (REFMRWA-S-508, 510 & 512)

HIGH STRENGTHFILLER (COMPO)

SIKADUR 31 (SIKA), NITOMORTAR EL-HB (PARCHEM),MEGAPOXY PM (VIVACITY), EPIREZ 633, DUO-BOND(DEKS), FERROPRE (HENKEL)

CONCRETE

GROUT

32 MPa PREMIXED or > 50 MPa BAGGED or COMPO

ACRYLIC, SBR or LATEX BONDING AGENTBONDING AGENT

HIGH FLOW, LOW SHRINKAGE CEMETITIOUS MATERIALeg: LIQUIFILL GRADE PC1 or RAPIDFILL A

SUPPLIER / SPECIFICATIONMATERIAL

ALL PREPARATION FOR AND APPLICATION OF MATERIALS SHALL COMPLY WITH THEMANUFACTURER'S INSTRUCTIONS

TABLE 500-B: LIVE SEWER WORKS MATERIALS

MORTAR TYPE M4, CONSTITUENTS AS PER TABLE 500-C

-

AS 1379

-

AS 1478.1

AS 3700

STANDARD

SAND 4.5

BUILDING LIME 0.5

1GP or GB CEMENTOPTION 1MATERIAL

TABLE 500-C: ACCEPTABLE MORTAR MIX PROPORTIONS

4

0

1

3

0 - 0.25

1

WATER THICKENER OPTIONAL YES OPTIONAL

AS 3972STANDARD

AS 1478.1

AS 1672.1

WSA PS 360

DECOMMISSIONEDPROPERTY CONNECTION(REF MRWA-S-514)

NEW MAINTENANCESTRUCTURE (REFMRWA-S-508, 510 & 512)

SIDE BOUNDARY

REAR BOUNDARY

FIGURE 500-A1: BEFORE NEWCONNECTION TO EX STRUCTURE

EX CONCRETE MH

FIGURE 500-A2: AFTER NEWCONNECTION TO EX STRUCTURE

SIDE BOUNDARY

REAR BOUNDARY

NEW CONNECTION(REF MRWA-S-506)

TYPICAL EXAMPLES OF LIVE SEWER ALTERATIONS

OPTION 2 OPTION 3

Surface Preparation & Placement of Materials:A. Prepare existing concrete and pipe for new concrete / Compo. Remove any

redundant items, hose down & scabble existing concrete to expose aggregate.Specialised scabbling tools shall be used for significant areas (ie: > 150 x 150).

B. Place Bonding Agent on all bonding surfaces to be concreted or mortar rendered.C. Fill redundant shaft inflow pipe or fix new pipe stub in place with Compo.D. Render any channel concrete to required geometry with mortar or Compo.E. Fill any redundant channel and base connection with concrete.F. If live flow in other channels can be maintained below the invert of the channel

being constructed or decommissioned, concrete or render may be placed byhand without the need for a retaining plate or flow isolation.Ensure no concrete enters a live channel.

G. If live flow in other channels will be above the invert of the channel beingconstructed or decommissioned, new concrete shall be formed against aretaining plate (refer Figure 516-E) set flush against the live flow channel surface.Alternatively the flow can be reduced or restricted.

TO SHAFT OF EXISTING PLASTIC MH TABLE 104A-A, MRWA-S-306B

TO SHAFT OF NEW MS or MC PRESSURE / VACUUM TESTING NOT REQUIRED.VISUAL RECORD (REFER TABLE 500-D).

TABLE 104A-A, MRWA-S-305,306 & 512

ONLY IF SUITABLE UNUSED CHANNEL IS CONFIRMED FOR DROP

MRWA SEWERAGE STANDARDS

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Planning Design Construction

R. JAGGERR. JAGGER

JUNE 2020JUNE 2020

PRE-PUBLISHED DRAFT1

2020 1CP / GA / NGJUN 20

ALL DIMENSIONS IN mm UNLESS STATED OTHERWISE

G. ANTHONSENC. PAXMANN. GERHARD

S. TRIKHA

R. LEOND. STEWART

SEP 20SEP 20SEP 20

SEP 20SEP 20SEP 20

PUBLISHED FIRST ISSUE2 CP / GA / RLSEP 20

NOT TO SCALE

LIVE SEWER WORKSMRWA-S-500

LEGEND:New Assert (black)

Existing asset (blue)

THIS LEGENDAPPLIES TO ALL500 SERIESSTANDARDS

· ALL WORKS SHALL BE UNDERTAKEN BY AN APPROPRIATELY ACCREDITED (APPROVED) LIVE SEWER CONTRACTOR· THE 500 SERIES STANDARDS DO NOT PROVIDE INFORMATION ON THE REHABILITATION OF SEWERS OR CONNECTIONS

CONDITION ASSESSMENT:1. "DEFECTIVE" is defined as having 8 or more points as per Appendix C of WSA 05. "SOUND" is not defective.2. Connect to or alter the height of existing assets which are in sound condition. Assess condition using one of the following:

2.1. Existing Pipe. Expose the pipe at location of work and visually inspect.If pipe is defective, expose more pipe and inspect (up to 1m in both directions or as far as practical).If this pipe is defective, insert push rod CCTV through a small hole (<30) in crown of pipe and inspect further.If work is abandoned due to poor pipe condition, patch hole with section of half pipe, Compo and then concrete in place.

2.2. Existing Pipe. CCTV inspect the main from a neighboring maintenance structure.2.3. Existing Maintenance Structure. Visually inspect, take visual records and survey any structure prior to works commencing.

3. Replace all joints and defective pipe within 300 of new pipe or new structures.4. Should a defective section of sewer not be able to be taken out of service or be too long to practically re-lay, contact the Water

Agency for advice. Typically a structural liner will be installed to rehabilitate the sewer prior to connection to the liner.

FRONT BOUNDARYFRONT BOUNDARY FRONT BOUNDARY

FRONT BOUNDARY

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R. LEOND. STEWART

SEP 20SEP 20SEP 20

SEP 20SEP 20SEP 20


NOT TO SCALE

PIPE CONNECTIONSMRWA-S-503

FIGURE 503-A: SS JUNCTION CLAMP

FLOW

TABLE 503-A: PROPERTY CONNECTION JUNCTION FITTINGS

STAINLESS STEEL 45° JUNCTION CLAMP,(unless conc embedment / encasement)

100 150 225 300 375 600525450 > 675

PVC DWV 45° JUNCTION (OB) - IN LINE FITTING

PVC, PP, GRP 45° JUNCTION (OB) - IN LINE

HOST PIPE

PVC DWV

PP

CONNECTION FITTING TYPESEWER STATUS

OUT OF SERVICE

PE

PVC DWV, PP,GRP, VC or CONC

DRY or LIVE SEWER

LIVE SEWER

ELECTROFUSION SADDLE JUNCTION 4 GRP GRP FABRICATED 45° JUNCTION (OB)- IN LINE

TYP NOT OKACCEPTABLE HOST DN

PROCESS STEP DESCRIPTIONSTEPAB

CD

E

F

H

I

TABLE 503-B: CLAMP / SADDLE JUNCTION INSTALLATION INSTRUCTIONS (assuming existing sewer in acceptable condition)

Place clamp or saddle correctly over hole so no host pipe surfacevisible looking through the branch opening (ie: no flow impedance)

Mark the outline of the branch's hole and the saddle perimeter,remove the mat / saddle and oversize the outline of the hole by 5mmusing a paint marker

Support the pipe so that it does not sag when the hole / coupon is cut

Ensure saddle / clamp matches the outside diameter of the host pipeLINING SADDLEMatch lining OD

N/A

Excavate pipe and determine the optimum location for junction.Keep junction 300 clear of pipe defects and pipe sockets / collars

Cut out the hole (using saber, hole or air saw, grinder), ensuringthat all cut out material, swarf and jagged edges are removedClean the pipe / clamp mat / saddle surfaces

G

Apply jointing compount (ref Table 503-C) to outside of hostpipe and saddle inside surfaces

If installing a saddle on a pipe lining, clear host pipe away from theliner equal to the saddle length plus ~150mm both sides of saddlePlace rubber mat from clamp or saddle junction over host pipe,orientating branch as required for TY1, 2 or 4 junction

J

K

SS CLAMP DWV SADDLE OTHER SADDLE PE SADDLE

Rotary peel bondingarea of PE pipe & cleanwith approved wipe

EXCEPTIONS / SPECIAL REQUIREMENTS

N/A N/A N/A N/A

N/A

Hold / fasten clamp / saddle firmly in place.Place temporary pipe (OD close fit to ID of saddle) down throughsaddle offtake and through hole in host pipe to keep saddle and hostmain holes aligned until jointing compound sets.

LM

N

Bolt halvestogetherandtightenfirmly

Fasten SS hoseclamps until bondingagent oozes fromsaddle. Cure epoxybefore loading.

Hold saddlefirmly on pipe for15 sec. Do notdisturb for 5 min

Clean off excess bonding agent from the inside surface of the pipeIf the hole is cut after fixing the saddle, cut out the hole through thebranch (using hole saw), ensuring that all cut out material, swarf andjagged edges are removedIf Type 2, support junction with concrete or cement stabilisedembedment. Remove pipe supports, place embedment & backfill.Test the property connection (as per Table 500-A if existing main)O

Strap saddle tomain in accordancewith themanufacturer'sinstructions

N/A N/A

FIGURE 503-C: PE ELECTROFUSIONSADDLE JUNCTION ON PE PIPE· Transition PE to DWV as per Figure 317-A.· For DN100 property connections, use a saddle

with DN110PE branch.· For DN150 property connections, use a saddle

with DN160PE branch.

Also chamfer insidediameter of PE branchto match DWV ID

REFERENCE

MRWA-S-302 to 304

MRWA-S-302 to 304

MRWA-S-302 to 304

FIGURE 503-C

LINER or DWV WITHCONC EMBEDMENT

FIGURE 503-D or EDWV SADDLE JUNCTION

VC or CONC WITHCONC EMBEDMENT

OUT OF SERVICE

OUT OF SERVICE

VC SADDLE JUNCTION

DEFECTIVE PIPE OUT OF SERVICE 45° JUNCTION (OB) AND MAKE UP PIECE

FIGURE 503-D: CONCRETE EMBEDDEDDWV, GRP, PP, VC or CONCRETE PIPE

FIGURE 503-F: CONNECTING TO PIPE WITH LOCAL DEFECTS (AFTER WORKS)

SOUNDEXISTING

PIPESOUND

EXISTING PIPE

DEFECTS >300

SOUNDEXISTING

PIPESOUND

EXISTING PIPE

>300

COUPLING OR CLAMP AS PERFIGURES 514-C to E

NEW PIPE

FIGURE 503-D

FIGURE 503-F

REMOVE SOCKET / COLLARIF WITHIN 300 OF DEFECTOR NEW JUNCTION FITTING

JUNCTION FITTING(AS ABOVE)

(BEFORE WORKS)IF NO JUNCTIONCOMPATIBLE WITHEXISTING PIPE, NEWPIPE & FITTING ASPER OPPOSITE SIDEMAY BE USED

LIVE SEWER INSTALL STRUCTURAL LINER & CONNECT FIGURE 503-E

EX CONCRETE

SMOOTHINTERNALPROFILE

EMBEDMENT

SADDLE

AS PER ROWS 1 to 3 ABOVE

DEFECTIVE PIPE

GRP WITH CONCEMBEDMENT

FIGURE 503-DOUT OF SERVICE orLIVE SEWER

GRP SADDLE JUNCTION

FIGURE 503-A & B

CONCRETE or CEMENT STABILISE IF:1) TYPE 2 CONNECTION, or2) IF PP PIPE + SS HALF CLAMP SADDLE

FIGURE 503-B: SS JUNCTION CLAMP ELEVATION

EMBEDMENT

ENSURE OFFTAKEPROTRUSION FITSWITHIN PIPE CUTOUT

CONCRETEOR CEMENTSTABILISEDIF TYPE 2CONNECTION

TABLE 503-C: SADDLE JOINTING COMPOUND & ADAPTATION TO DWV

PP

PIPE

GRP

FIGURE 317-A

ADAPTATION TO DWV

VC or CONCRETE

REDUCING JUNCTION CLAMP *ORDER SADDLE WITH DWV OFFTAKEHEPWORTH SA9 or SA10 ADAPTOR

PE

PVC STUB

JOINTING COMPOUND(REF TABLE 503-C)

SILICON SEALANT

JOINTING COMPOUND

SIKADUR 31 or MEGAPOXY PMCOMPO

ELECTRO-FUSION WELD

DWV NAPRIMER & SOLVENT CEMENT

DWVBEND

ADAPTOR

NOTES Regarding Table 503-A & B:1. Denotes only DN100 offtake available.

Denotes that DN100 and DN150 branches are acceptable and available.2. The terms "OUT OF SERVICE" and "DRY" are interchangeable.3. > DN225 branches are not acceptable.4. All junction fittings are to connect at 45° to the upstream line.5. For PE Electrofusion saddles, use 45° wastewater EF saddles where available. Otherwise use 90°large bore EF branch saddles.6. For Type 2 saddle or clamp connections, support all saddle and clamp offtakes with concrete or cement stabilised bedding to

prevent vertical loads rotating the offtake. Place between underside of offtake and extend down to native soil. Refer Figure 503-B.

SS316 HOSE CLAMPS(DEKS INDUSTRIES)

FIGURE 503-E:DWV SADDLE JUNCTION ON SEWER LINING

PVC SADDLE, Ø TOSUIT LINING OD

SIKADUR 31 orMEGAPOXY PM

<150

CLEAR HOSTMAIN 150FROM LINER

OUT OF SERVICE orLIVE SEWER

OUT OF SERVICE orLIVE SEWER

INSTALL JOINTING COMPOUNDS IN ACCORDANCE WITH MANUFACTURER'S INSTRUCTIONS.

<300

<300

ENSURE CLAMP 300 CLEAROF JOINTS AND DEFECTS

FLOW

SS

SADDLE

GRP + DWVVC

PE

DWVNALINER DWV SIKADUR 31 or MEGAPOXY PM

* REMOVE BOTTOM HALF OF CLAMP, PLACE TOP HALF OF CLAMP WITH OFFTAKE & CONCRETE IN PLACE

PLACE CONCRETE OR CEMENT STABILISED EMBEDMENTUNDER OFFTAKE AS INDICATED IN FIGURE 503-B

TYPE 2ALIGNMENT

TYPE 1 or 4ALIGNMENT

ENSURE SADDLE 300 CLEAROF JOINTS AND DEFECTS

EX SOCKET / COLLAR CANBE RETAINED IF >300 FROMNEW PIPE

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FIGURE 506-C1: EXISTINGCONCRETE MH SHAFT

FIGURE 506-H2: PREPARATION FOR BASECONNECTION WITHIN EX MH BASE

FIGURE 506-D2: PREPARATION FORDROP BEND WITHIN EX MH BASE

TEMPORARYCHANNEL ENCLOSURE

FIGURE 506-I2: PREPARATION FOR BASECONNECTION ABOVE EX MH BASE

NEW

SHA

FT C

ONNE

CTIO

NS T

O EX

ISTI

NG C

ONCR

ETE

MHs

NEW

BAS

E CO

NNEC

TION

S TO

EXIS

TING

CON

CRET

E MH

s

FIGURE 506-D1: EXISTINGCONCRETE MH BASE

FIGURE 506-E1: EXISTINGCONCRETE MH BASE

FIGURE 506-H1: EXISTINGCONCRETE MH BASE

FIGURE 506-I1: EXTENDEDEXISTING CONCRETE MH BASE

CONNECT PIPE TO SHAFTAS PER FIGs 310-D to G

COMPO IN PLACEAS PER TABLE 500-B

DROP PIPE BRACKETSAS PER FIG 314-IDROP PIPE, BENDS & CHANNELAS PER FIG 311-C to E

FIGURE 506-C2: PREPARATION,MH SHAFT CONNECTION

FIGURE 506-E2: PREPARATION FORDROP BEND ABOVE EX MH BASE

SCABBLE ALLSURFACES WHICH WILLBE IN CONTACT WITHNEW CONCRETE

BREAKOUT, BETWEEN 50 & 75 LARGERIN DIAMETER THAN FUTURE PIPE STUB

PROVIDE ROUGH SURFACE:1) PLUG & FEATHER, or2) DRILL SERIES OF HOLES & BREAKOUT, or3) CORE DRILL & SCABBLE SURFACE(JACK HAMMERING NOT ALLOWED)

FIGURE 506-H3: FINAL ARRANGEMENT FORBASE CONNECTION WITHIN EX MH BASE

FIGURE 506-D3: FINAL ARRANGEMENTFOR DROP BEND WITHIN EX MH BASE

FIGURE 506-I3: FINAL ARRANGEMENT FORBASE CONNECTION ABOVE EX MH BASE

FIGURE 506-C3: FINAL ARRANGEMENTMH SHAFT CONNECTION

FIGURE 506-E3: FINAL ARRANGEMENTFOR DROP BEND ABOVE EX MH BASE

>750

CONCRETEELEVATED

TABLE

CONCRETE ELEVATED TABLE TOREQUIRED DIMENSIONS & FINISH

MORTAR RENDER CHANNEL TOREQUIRED DIMENSIONS & FINISH

MECHANICAL REMOVALOF BASE TO CREATEPENETRATION & CHANNEL

BREAKOUT SHAFTAS PER FIG 506-C2

SCABBLE ALL SURFACESTO BE CONCRETED

COMPO PIPESTUB IN PLACE

MECHANICAL REMOVAL OFBASE TO CREATE CHANNEL

COMPO PIPE STUB IN PLACE

MORTAR RENDER TOREQUIRED CHANNEL

DIMENSIONS & FINISH

CONNECT PIPETO BASE AS PER

FIGs 310-D to G

CONNECT PIPETO BASE AS PERFIGs 310-D to G


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R. JAGGERR. JAGGER

JUNE 2020JUNE 2020

2020 1




S. TRIKHA

R. LEOND. STEWART

SEP 20SEP 20SEP 20

SEP 20SEP 20SEP 20


NOT TO SCALE

NEW CONNECTIONS TOEXISTING CONCRETE MHs

MRWA-S-506

Connection to Shafts / Risers of Existing MHs:1. New shaft connections shall comply with MRWA-S-311.2. Drop pipes shall discharge with the following preference:

2.1. Into a new channel formed in the existing base (refer Figure 506-D).Provide a compelling reason to the Water Agency if this is not practical:

2.2. Into a channel formed within an elevated table (refer Figure 506-E).Provide a compelling reason to the Water Agency if this is not practical:

2.3. Into an existing live sewer channel, preferably at the downstream end of themain channel.

Connection to Base of Existing MHs:a. New base connections shall comply with MRWA-S-308 & 310.b. Designer shall specify whether connection level can be elevated to enable Fig 506-I option.c. Option described by Figure 506-I requires Water Agency approval.

Submit photo evidence to the Water Agency that the existing concrete base extends > 750 beyond MH shaft.

General Requirements:A. Inspect the structure or any pipe stub being connected to so as to obtain

geometric and condition information. Ref MRWA-S-500.B. Assess whether it would be better to connect to an existing maintenance

structure or construct a new structure over the existing sewer.Provide justification to the Water Agency for any decision.

C. Provide a detailed design as per MRWA-S-308 for all changes to existingMHs and new MHs on live sewers. All of the requirements detailed inMRWA-S-308 shall apply to alterations to existing concrete MHs.

D. Selection and application of all materials shall be as per MRWA-S-500.E. Where penetrations are to be made to existing shafts or where new

channels are to be formed in existing bases, implement measures to captureall debris and prevent this from entering the sewer. Existing channels shallbe covered or temporary pipes placed in existing channels.

F. Where tables are elevated, ladders or step irons shall be modified toconform to MRWA-S-314.

G. Where unused stubs are being connected to, new pipe connecting to thestub shall be of the same material as the stub. Inspect existing stubs toconfirm material.

FIGURE 506-A: BEFORENEW CONNECTION

EXI

STIN

G SE

WER

EX MH

FIGURE 506-B: AFTERNEW SHAFT CONNECTION

EXI

STIN

G SE

WER

NEWSHAFTCONNECTION

-

-3

-

FIGURE 506-F: BEFORENEW CONNECTION

EXI

STIN

G SE

WER

EX MH

FIGURE 506-G: AFTERNEW BASE CONNECTION

EXI

STIN

G SE

WER

NEWBASECONNECTION

-

-3

-



EX MH

EX MH

PIPE Ø +50 to 75

EXISTING BASE

NEWCHANNEL

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· The existing pipe shall not be broken into until as much of the MH has beenconstructed as possible.

· While it remains unbroken, the excavation may or not be a confined space.Decision shall depend on possibility of hazardous atmosphere and the age, typeand condition of pipe.

1. Excavate and expose the pipe where MH is to be constructed.2. Identify the most appropriative location for the new MH.

Ensure pipe at and around new MH is in sound condition, preferably straight withas few joints as possible.

3. Thoroughly clean pipe to be encased and where MH encasement is to occur:3.1. If PVC DWV- prime the pipe before applying solvent cement fully around

the pipe. Sprinkle builders sand liberally to the solvent cement while soft.Allow to harden before concreting.

3.2. If PP, VC or CONC- applying a circular 2 thick Hydrotite bandage 75 backfrom where the pipe crown will be removed.

3.3. If GRP- sand the pipe with coarse sand paper. Then apply polyester resinto abraded surface and sprinkle builders sand liberally to resin while soft.Allow to harden before concreting.

4. Place polystyrene blockout above the existing pipe and for any new lateralconnection chase / channel as per Figure 508-D1 and E1.

5. Place steel reinforcement for base as per Table 310-B. Mesh may be difficult toplace, in which case place equivalent bars as much as practical.

6. Install formwork required in preparation for placement of concrete for the base.7. Pour the in-situ cast base including nib wall and starter bars in accordance with

MRWA-S-310.8. Pour the wall segments and shaft connections (if present) as per MRWA-S-311.

9. Pour the MH top and set cover and frame as per MRWA-S-313 & 313B.10. Fix ladder / step irons / landings / drop pipe as per MRWA-S-314.11. Remove the polystyrene blockout from the base. Recommended lateral channel

block out foam be removed first & side channel inspected & rendered as requiredbefore live channel blockout foam and crown are removed.

12. Vacuum test the new MH and new connection pipework (refer Table 500-A).13. Cut out the top of the pipe (crown) as per Figure 508-D3.14. Cut out the side of the existing pipe to allow the new lateral channel to enter the

main channel as per Figure 508-E3.15. Render the top edges of the cut pipe and any gap between pipe and base with

Compo (refer Table 500-B) in accordance with Figure 508-D4 & E4.16. Once the MH walls have set sufficiently, backfill in accordance with the MRWA

Backfill Specification MRWA-04-03.

Concrete Maintenance Hole Construction Over Existing Sewers:

FLOW THROUGH FOAMBLOCKOUT

REQUIRE SHORT FLOW ISOLATION(SUITABLE FOR SMALL FLOWS)

REQUIRE SECTION OF SOUND PIPEIN A SUITABLE LOCATION

CONSTRUCT OVEREXISTING SEWER

LIMITATION / OUTCOMEOPTION (IN ORDER OF PREFERENCE)TABLE 508-A: FLOW MANAGEMENT & CONSTRUCTION OPTIONS

2A

1

3 BYPASS PUMPING MORE COSTLY AND RISKY

4

CONSTRUCT OVER NEWSECTION OF REPLACED PIPE

FIG 508-D & E,MRWA-S-510

REFERENCE

PIPE

FOAM BLOCKOUT

FIGURE 508-D1: PREPARATION: AWAY FROM LATERAL CONNECTION

PIPENEW BASECONCRETE

FIGURE 508-D2: BASE CONCRETE IN PLACE, AWAY FROM LATERAL CONNECTION

PIPE

FIGURE 508-E1: PREPARATION, AT LATERAL CONNECTION

PIPE

FIGURE 508-E2: BASE CONCRETE IN PLACE, AT LATERAL CONNECTION

FOAMBLOCKOUT

NEW BASECONCRETE

CUTCUT

FIGURE 508-D3: CUT OUT EXPOSED PIPE FIGURE 508-D4: RENDER TOP EDGE OF CUT PIPE

COMPO

CUT

FIGURE 508-E3: CUT OUT EXPOSED PIPE FIGURE 508-E4: RENDER TOP EDGE OF CUT PIPE

CUTCOMPO

FIGURE 508-A: OPTION 1, PLAN VIEW

EXI

STIN

G SE

WER

NEWMH

NEWLATERALCONNECTION

-

B

-

A

-

GENERAL REQUIREMENTS:A. Comply with Confined Space entry requirements of the Water Agency throughout the works.B. Submit Work Method Statement if this has been requested by the Water Agency.C. This standard is applicable to both new shaft and new base connections to concrete MHs constructed around an existing sewer.

Refer MRWA-S-311 for new shaft connection and MRWA-S-310 for new base connection requirements.D. Excavate down to and around pipe where the MH is to be constructed, ensuring that the main is stable and not damaged.E. Assess the condition of the pipe in accordance with MRWA-S-500, note 2. Construct around existing pipe in sound condition.

The new MH may need to be constructed in an alternate location or the pipe replaced (ref Option 2C) or rehabilitated prior to work.F. Construct concrete MHs in accordance with MRWA-S-307 to 317 as much as practical.G. Once the MH walls have cured sufficiently, backfill in accordance with the MRWA Backfill Specification MRWA-04-03.

OPTION 1SECTION A

FIGURES (INCHRONOLOGICAL

SEQUENCE)

OPTION 1SECTION B

FIGURES (INCHRONOLOGICAL

SEQUENCE)

GRAVITY BYPASS NOT TYPICALLY PREFERRED

OPTION 2B FIGURES IN

CHRONOLOGICALSEQUENCE

FIGURE 508-F1: FOAM BLOCKOUT WITHINTERNAL FLOW THROUGH PIPE

FIGURE 508-F2: FOAM BLOCKOUT

NEW BASECONCRETE

FIGURE 508-F3: BASE CONCRETE IN PLACE, AWAYFROM LATERAL CONNECTION (THROUGH SECTION A)

FIG 508-F

FIG 512-I & J

-

-

DWV PIPE THROUGH FOAMBLOCKOUT FOR SEWAGETO PASS THROUGHDURING CONSTRUCTION

FIGURE 508-F4: BASE CONCRETE IN PLACE, ATLATERAL CONNECTION (THROUGH SECTION B)

NEW BASECONCRETE

FIGURE 508-C: NEW MH BASE INSTALLED OVER EXISTING PIPE

NEW LATERALCHANNEL

FIGURE 508-B: EXISTING PIPE OVER WHICH CONCRETE MH WILL BE CONSTRUCTED

FOOTPRINT OFPIPE CROWN TOBE REMOVED

RELEVANT TO ALL OPTIONS SHOWN IN MRWA-S-508 to 512

PIPE SURFACE TO BEPREPARED FOR CONCRETE

PIPE SURFACE TO BEPREPARED FOR CONCRETE

SHAFT OR BASECONNECTION

INSTALL PREFABRICATEDMAINTENANCE STRUCTURE

FIG 512-D,F & L


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NOT TO SCALE

LIVE SEWER CONCRETE MH CONSTRUCTIONMRWA-S-508

PIPE

FOAMBLOCKOUT

ALTERNATIVE BLOCKOUT PROFILE IFCHANNEL FOR SHAFT CONNECTION

PIPE STUB AS PERFIGs 310-D to G IFBASE CONNECTION

STEELREINFORCEMENT,BARS WIRED INPLACE WHEREPRACTICAL

>150

NOTE: ONE OF 3 MH CONNECTORS NOT YET PLACED

2B

2C

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MAINTAIN CONCRETEHAUNCH UNDER PIPEIF PRACTICAL


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PUBLISHED FIRST ISSUE

2020 1




S. TRIKHA

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SEP 20SEP 20SEP 20

SEP 20SEP 20SEP 20


NOT TO SCALE

LIVE SEWER CONCRETE MHCONSTRUCTION, CONCRETE ENCASED

MRWA-S-510

PIPE

EX CONCRETE

FOAM BLOCKOUT

>75

~2 3 PIP

E Ø

FIGURE 510-B1: PREPARATION,DEEP CONCRETE EMBEDMENT

DOWEL

PIPE

EX CONCRETE

FOAM BLOCKOUT

FIGURE 510-C1: PREPARATION,EXPOSED CONCRETE EMBEDMENT

PIPE

EX CONCRETE

NEW BASECONCRETE

FIGURE 510-C2: BASE CONCRETE IN PLACE

~1 3 PIP

E Ø

PIPE

EX CONCRETE

>75

~2 3 PIP

E Ø

FIGURE 510-B2: BASE CONCRETE IN PLACE

DOWEL

~1 3 PIP

E Ø

PIPE

EX CONCRETE

FIGURE 510-D1: PREPARATION, CONCRETE ENCASEMENT FIGURE 510-D2: BASE CONCRETE IN PLACE

PIPE

EX CONCRETENEW BASE

PIPE

FOAMBLOCKOUT

FIGURE 510-E1: PREPARATION, DEEP CONCRETEEMBEDMENT AND SMALLER LATERAL CONNECTION

SMALLER SEWER INVERT

PIPE

FIGURE 510-F1: PREPARATION, DEEP CONCRETEEMBEDMENT AND LARGER LATERAL CONNECTION

ELEVATED LARGERSEWER INVERT

PIPE

FIGURE 510-F2: BASE CONCRETE IN PLACE, CONCRETEEMBEDMENT AT LATERAL CONNECTION

ELEVATEDSEWER INVERT

ELEVATED TABLE LEVEL

EX CONCRETE

EX CONCRETE EX CONCRETE

PIPE

FIGURE 510-E2: BASE CONCRETE IN PLACE

NORMAL TABLE LEVEL

EX CONCRETE

FOAMBLOCKOUT

SMALLER SEWER INVERT NEW BASE

NEW BASE

PIPE

EX CONCRETE

FIGURE 510-G1: PREPARATION, CONCRETEENCASEMENT, AWAY FROM LATERAL

FIGURE 510-G2: PREPARATION, CONCRETEENCASEMENT, AWAY FROM LATERAL

EX CONCRETENEW BASE

PIPE

ELEVATEDTABLE LEVEL

CONSTRUCTION DETAILS, SECTION A OPTIONS(AWAY FROM LATERAL CONNECTION)

CONSTRUCTION DETAILS, SECTION B(DROP OR BASE LATERAL CONNECTION)

Concrete Embedment (Figures 510-B, C, E & F):1. Drill a pilot hole through concrete embedment / encasement to confirm thickness and condition of embedment.2. Ensure concrete is able to withstand dowel insertion and scabbling without fracturing. Remove all weak material or if most concrete is

weak, remove all concrete embedment. Concrete removal method shall take into account the condition of the existing pipe and thedegree to which it can withstand vibration and impact.

3. Scabble all existing concrete surfaces which will bond with new concrete until aggregate exposed.4. Place dowels as shown at 200 spacing for the length of the new MH, ensuring that all dowels will have > 75 clear cover once concreted in

place as per Figure 510-B1 and dowels > 75 from the pipe.Dowel thickness as per Table 310-B. Insert into the existing concrete with adhesive capsule chemical anchors. Keep dowels >75 clear ofany new lateral channel connection.If concrete thickness is less than half pipe Ø, reduce the penetration of the dowels to ensure they have adequate clear cover underneath.

5. Where the concrete is in good condition, shallow and structurally sound enough to safely excavate underneath the embedment, prepareas per Figure 510-C1.5.1. Support pipe against deflection due to weight of concrete where required (ie: if flexible pipe).5.2. Place base N16 x 200 reinforcement bars at 45° and 135°to the sewer as much as practical.

6. Place foam blockout at lateral connection if channel required for shaft connection with drop pipe, as per Figure 510-E1.7. Place foam blockout and stub pipe at lateral connection if channel required for a base connection, as per Figure 510-F1.8. Prepare concrete surface and place materials as per Figures 510-B, C, E and F and MRWA-S-500 and 508.9. Remove blockout and pipe crown as per Figure 508-D3 and E3, ensuring no material falls into the live channel.10. Trim all edges and smooth rough edges with Compo as per Figures 508-D4 and E4.

Concrete Encasement (Figures 510-D & G):Connection to a concrete encased sewer requires Water Agency approval and shall only be undertaken where there is no practical alternative.Approval will depend on the contractor having a sound methodology to prevent debris entering the sewer.A. Excavate down to string line of the encasement and drill a dowel hole to confirm condition of concrete.B. Ensure concrete able to withstand dowel insertion and scabbling without fracturing.C. Remove all weak material or if most concrete is weak, remove all concrete encasement. Concrete removal method shall take into account

the condition of the existing pipe and the degree to which it can withstand vibration and impact.D. Remove concrete encasement for lateral connection as per Figure 510-G1.

Refrain from removing concrete from the haunch of the pipe, even if that means elevating the lateral inflow channel.E. Scabble all existing concrete surfaces which will bond with new concrete until aggregate exposed.F. Place dowels as shown at 200 spacing for the length of the new MH, ensuring that all dowels will have > 75 clear cover once concreted in

place and are > 75 from the pipe as per Figure 510-D1. Dowel thickness as per Table 310-B.Insert into the existing concrete with adhesive capsule chemical anchors. Keep dowels >75 clear of any new lateral channel connection.Dowels are shown in the below figures as horizontal, but may be angled upwards to as much as 45 deg from horizontal.

G. Place foam blockout at lateral connection if channel required for shaft connection with drop pipe.H. Place foam blockout and stub pipe at lateral connection if channel required for a base connection.I. Prepare concrete surface and place materials as per Figures 510-D & G and MRWA-S-500 and 508.J. Remove blockout and pipe crown as per Figure 508-D3 and E3, ensuring no material falls into the live channel.K. Trim all edges and smooth rough edges with Compo as per Figures 508-D4 and E4.

NEW BASECONCRETE

>150

REMOVE EXCESS CONCRETEAND PIPE CROWN AS PER FIG508-D3 and D4

ELEVATED TABLE LEVELSCABBLE SURFACE OF ALL EX CONCRETETO CONTACT NEW CONCRETE

CUT

CUT

CUT

REMOVE EXCESS CONCRETE ANDPIPE CROWN AS PER FIG 508-E3 & E4

SCABBLE SURFACEOF ALL ACCESSIBLEEX CONCRETE TOCONTACT NEWCONCRETE

SCABBLESURFACE OFALL ACCESSIBLEEX CONCRETETO CONTACTNEW CONCRETE

BLOCKOUT PROFILE IF CHANNEL FORSHAFT CONNECTION DROP BEND

PIPE STUB AS PER FIGs 310-D to G

FOAM BLOCKOUT FORNEW SEWER INFLOW SAME

Ø AS EXISTING SEWER

FOAM BLOCKOUT FORNEW SEWER INFLOW SAME

Ø AS EXISTING SEWER

ELEVATE LATERALSEWER SO EX

CONCRETE UNDERHAUNCH LEFT IN PLACE

PIPE STUBNOT SHOWNFOR CLARITY

ELEVATE LATERALSEWER SO EX

CONCRETE UNDERHAUNCH LEFT IN PLACE

~23 PIPE Ø

~13 PIPE Ø

> 75

FIGURE 510-A: PLAN VIEW E

XIST

ING

SEW

ER

NEWMH

-

B

-

A

-

FOOTPRINT OF PIPECROWN TO BEREMOVED

NEW SHAFTOR BASECONNECTION

MECHANICAL REMOVAL OFCONCRETE ENCASEMENTFOR NEW LATERAL CHANNEL

(INTERNAL DROP CONNECTION AND SHALLOW CHANNEL SHOWN)

(BASE CONNECTION AND DEEP CHANNEL SHOWN)

DOWEL

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NOTES Regarding Inserting Plastic Structures into Existing Sewers:· This type of installation may only be used where:·· Flows can be contained without significant risk.·· The host sewer is not lined.

· Plastic structures with flexible RRJ connectors are recommended.· Comply with the Water Agency's confined space entry requirements at all times.· Undertake installation as follows:

1. Submit Work Method Statement if this has been requested by the Water Agency.2. Excavate down to and around the pipe where the plastic structure is to be constructed.

3. Minimise the amount of pipe embedment removed around the existing pipe.4. Prepare the base in accordance with MRWA-S-305, 306 & 306B.5. Stop sewer flow from entering the main to be cut.6. Place a band around the existing pipe to mark straight cut lines where the pipe is to be cut.7. Cut (+/- 3 mm from straight circumferential line) and dry the main.8. Place plastic structure with pipe extension(s) and lubricated couplings (if coupling).9. Pull back couplings or place clamps over joins, ensuring fitting is centered over the gap.10. Install remaining items, place embedment and backfill as per MRWA-S-305, 306 & 306B.

FIGURE 512-D: NEW PLASTIC STRUCTUREINSTALLED INTO EXISTING SEWER

FIGURE 512-H: EXAMPLE OF STRUCTURE TO BE REMOVED INPREPARATION FOR MH AND LARGER CONNECTION (ELEVATION)

PREPARED PIPESURFACE (REF

NOTE 3 OFMRWA-S-508)

FIGURE 512-I: REPLACE DEFECTIVE OR REMOVEDSTRUCTURE WITH SECTION OF NEW SEWER

(REFER MRWA-S-508 & 510 FOR CONSTRUCTION DETAILS)

FIGURE 512-G: EXAMPLE OF DEFECTIVE PIPE AT LOCATIONWHERE NEW CONCRETE MH IS TO BE CONSTRUCTED (ELEVATION)

FIGURE 512-J: INSTALL CONCRETE MH OVER NEW SECTION OF SEWER(REFER MRWA-S-508 & 510 FOR CONSTRUCTION DETAILS)

FIGURE 512-B: EXAMPLE OF DEFECTIVE PIPE WHERE NEW PLASTICMAINTENANCE STRUCTURE IS TO BE INSTALLED (ELEVATION)

FIGURE 512-A: EXISTING PIPE WHERE NEW PLASTIC MAINTENANCESTRUCTURE IS TO BE INSTALLED (ELEVATION)

FIGURE 512-C: EXAMPLE OF STRUCTURE TO BE REMOVED IN PREPARATION FORPLASTIC MAINTENANCE STRUCTURE INSTALLATION (ELEVATION)

SLIP COUPLING, FLEXIBLECOUPLING, OR CLAMP(REFER FIGURES 514-C to E)

FIGURE 512-E: EXAMPLE OF STRUCTURE TO BE REMOVED INPREPARATION FOR MH AND LARGER CONNECTION (ELEVATION)

FIGURE 500-F: NEW PLASTIC MH WITHLARGER SHAFT CONNECTION

FIGURE 512-L: LARGER CONNECTION TO NEW PLASTICSTRUCTURE ON AN EXISTING SMALL SEWER

DN225 CHANNEL

NEW PLASTICSTRUCTURE

DN22

5CH

ANNE

L

NOTE: DISPENSATIONREQUIRED

SLIP COUPLING, FLEXIBLE COUPLING,or CLAMP (REFER FIG's 514-C to F)

ECCENTRIC REDUCER(COMMON INVERT)

ECCENTRICREDUCER(COMMONINVERT)

EXISTINGDN150SEWERPIPE

EXISTINGDN150SEWERPIPE

NEW

DN2

25CO

NNEC

TION

FIGURE 512-K: LARGER CONNECTIONS TO NEW CONCRETEMH ON AN EXISTING SMALLER SEWER

(REFER MRWA-S-508 & 510 FOR CONSTRUCTION DETAILS)

NEW DN225CONNECTION

EX

DN15

0 SEW

ER

NEW CONCRETE MH

NEWCHANNEL

NOTE:DISPENSATIONREQUIRED

General Notes:· "DEFECTIVE PIPE" is defined as having 8 or more points as per Appendix C of WSA 05- Conduit Inspection Code.· While existing sewer is shown as brown (indicating VC pipe), the existing pipe may be of any type.· To make a new shaft connection to an existing plastic maintenance structure, excavate to the new shaft connection level and

install shaft connection as per MRWA-S-305, 306 & 306B. Some brands will require that the entire top section of structure beremoved and a shaft coupler added. Some brands will enable a shaft connection to be made to an existing shaft.

SLIP COUPLING, FLEXIBLECOUPLING, OR CLAMP(REFER FIGURES 514-C to F)

SLIP COUPLING, FLEXIBLECOUPLING, OR CLAMP(REFER FIG's 514-C to F)REFER MRWA-S-305,

306 & 306B FORPLASTIC STRUCTUREINSTALLATION DETAILS NEW SHAFT

CONNECTION


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S. TRIKHA

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SEP 20SEP 20SEP 20


NOT TO SCALE

LIVE SEWER MAINTENANCE STRUCTUREINSTALLATION EXAMPLES

MRWA-S-512

>2 xPIPEØ

>2 xPIPEØ

>2 xPIPEØ

NEW PIPE

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S. TRIKHA

R. LEOND. STEWART

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SEP 20SEP 20SEP 20


NOT TO SCALE

REPAIR OF SEWERSAND DECOMMISSIONING

OF SEWER PIPE CONNECTIONS

MRWA-S-514

NEW MAKE-UP PIPE

FIGURE 514-C: PIPE INSERTION USING FLEXIBLE COUPLINGS

TYPE B, STRAUB or REHAU AWADUCTFLEX-CONNECT COUPLINGSCENTERED ON JOINT, AS PER FIG 514-E

SOUNDEXISTING

PIPE

SOUNDEXISTING

PIPE

MINLENGTH

300

5 MAX GAP REINSTATE BEDDING

NEW MAKE-UP PIPE

FIGURE 514-D: PIPE INSERTION USING SLIP COUPLINGS

SLIP COUPLINGSCENTERED ON JOINT

SOUNDEXISTING

PIPE

SOUNDEXISTING

PIPE

MINLENGTH

300


NOTES Regarding Couplings, Clamps & Make Up Pieces:· Any makeup piece shall have the same ID as the host main +/-5.· Chamber internal protruding edges to ensure smooth transition through make up piece.· Ensure the sealing range of the selected product can accommodate the outside

diameter of both the existing main and make up piece as per Figure 514-E.· Slip couplings and clamps may only be used where the make up piece and existing host

main have the same outside diameter (+/- 1). Refer Figure 514-D & F: .· Clamps and couplings shall not be used in the construction of new pipelines.· Profiled repair clamps and joining clamps for insertion of pipe sections into profiled wall

pipe (ie: PP pipe) are available from the relevant manufacturer.· Ensure clamps overlap existing pipe as per Table 514-C.

MIN CLAMP LENGTH EITHER SIDE OF GAP

75

125

PIPE DN< DN375> DN450

TABLE 514-C: CLAMP OVERLAP

Option 2 Procedure- Pipe Insertion:1. Submit Work Method Statement if requested by the Water Agency.2. Minimise the amount of pipe embedment removed around existing

pipe.3. Inspect the pipe and determine its structural integrity. Only bridge

between existing pipe in sound condition with no defects.4. Expose as much as 3m of pipe in an attempt to find pipe of

acceptable condition.Where pipe of satisfactory condition cannot be found within that 3m,contact the Water Agency for advice. Typically the pipe insertionworks will need to be delayed or canceled as full pipe rehabilitationoptions will need to be considered.

5. Stop sewer flow from entering the main (plug upstream sewer).6. Place a band around existing pipe and mark straight cut lines (+/- 3

from straight).7. Obtain confined space permits and prepare for confined space entry

if this has not already been done.7. Cut the main and remove redundant pipework.8. Cut an insertion piece, ensuring gaps will be < 5 wide and that the

difference in ID is less than 5.9. Chamfer any protruding internal edge and ensure a smooth

transition.10. Clean outside surfaces of insertion piece and beyond each of the

existing pipe ends and lubricate if RRJ couplings are being used.11. Place a coupling over each existing pipe end (unless clamps used),12. Insert pipe piece and pull back couplings or place clamps over joins,

ensuring fittings centered over gaps.13. Embed and backfill as per MRWA-S-201 and 202.

NEW MAKE-UP PIPE.> 2 x CLAMP LENGTH

FIGURE 514-F: PIPE INSERTION USING CLAMPS

CENTER CLAMPSON JOINTS

SOUNDEXISTING

PIPE

SOUNDEXISTING

PIPE

MINLENGTH

300


FIGURE 514-A: MECHANICAL INSERT ARRANGEMENTS

SOUNDEXISTING

PIPE

SOUNDEXISTING

PIPE

POSSIBLE JUNCTION OFFTAKEMECHANICAL INSERT

POSSIBLEDEFECT >150

CENTRE INSERT AT CENTREOF DEFECT / OFFTAKE

>1mBACKFILL

DEFINITION

SHALLOW

SHALLOW

DEPTH

YES

YES or NO

TABLE 514-B: DEPTH DEFINITIONS

NO DEEP

2

1

3

< 3.5m DEEP

< 2.0m

> 2.0m DEEP

~5 ton EXCAVATOR ACCESS

YES or NO DEEP4 > 3.5m DEEP

>150

FIGURE 514-B: PATCH LINER ARRANGEMENTS

SOUNDEXISTING

PIPE

SOUNDEXISTING

PIPE

POSSIBLE JUNCTIONOFFTAKE APPROVED PATCH LINER

POSSIBLEDEFECT

>200 >200

~1000

CENTRE INSERT AT CENTREOF DEFECT / OFFTAKE

SITUATION OF USE

UNPAVED SHALLOW CONNECTIONS / DEFECTS and FLOW ISOLATION PRACTICAL

PAVED or DEEP CONNECTIONS / DEFECTS or EXCAVATION IMPRACTICALOPTION

FIG 514- C to F

FIG 514- A or B

TABLE 514-A: REPAIR / CONNECTION DECOMMISSIONING OPTIONS

FIG 514- G, H or I UNPAVED SHALLOW CONNECTIONS / DEFECTS and FLOW ISOLATION IS IMPRACTICAL

2

1

3

PIPE REPLACEMENT

INSERT / LINER

CAP CONNECTION

REFERENCE

· "PAVED" includes all surfaces which are not soil or gravel (eg: concrete, bitumen, paving etc).· Option 3 requires Water Agency approval.· "DEFECTS" or "DEFECTIVE PIPE" is defined as having 8 or more points as per Appendix C of WSA 05.

OPTION 1: MECHANICAL INSERT or PATCH LINER

OPTION 2: PIPE REPLACEMENT

OPTION 3: CAP CONNECTION

FIGURE 514-G: TYPE 2 CONNECTION CAP

Option 3 Procedure- Cap Connection :a. Excavate down to section of straight property connection

pipe nearest the junction fitting or concrete encasement.b. Cut this straight pipe within 100mm of the junction fitting,

junction bend or concrete encasement.c. Inspect inside the junction fitting & bend (with push rod

CCTV if necessary) from this location to confirm they arein sound condition (no cracks, defects and offtake doesnot protrude into reticulation main).Undertake Option 1 or 2 where a defect is observed.

d. If PVC DWV pipe, SCJ weld a cap to the cut end , orIf VC pipe, place a Fernco QwikCap or HepworthStopper at cut end.

e. Place concrete to 100 above the cap.f. Backfill any excavation in accordance with the MRWA

Backfill Specification.

<100

BACKFILL

CAP

NEW CONCRETE

UNPAVED SURFACE

EXCA

VATI

ON E

DGE

EX CONCRETEEMBEDMENT

>100

FIGURE 514-H: TYPE 1 or4 CONNECTION CAP

FIGURE 514-I: CONCRETEENCASED CONNECTION CAP

<100

>100

>100

<100

NEWCONCRETE

NEW CONCRETE

< 2.5

4

5

°

FIGURE 514-E: COUPLINGARRANGEMENTS

PIPE COUPLING

FLOW EITHER DIRECTION

< 5

CHAMFER

COUPLING WITHSEALING RANGE FORLARGER PIPE

GROUT AS PERMRWA-S-516

ONLY SUITABLE FOR BRIDGING WHERE HOST AND MAKEUP PIECE ARE THE SAME PIPE

EPDM RUBBER BUSH OFCORRECT THICKNESSTO COMPENSATE FORDIFFERENCE IN PIPE OD.BUSHES FOR > DN300PIPE ARE CUSTOM MADETO ORDER.

Quality Control:A. Contractors accredited by approved

mechanical insert suppliers shall assesswhich of mechanical insert or patch lineris the most appropriate sealing method.

B. Mechanical inserts shall be used wherepractical. Patch liners may be used when:B.A. a longitudinal crack is present in

the host main (where expansion ofthe mech insert may elongate thecrack),

B.B. an obstruction in the pipe preventsmechanical insert installation.

B.C. the defect is longer than can besealed by a mech insert .

C. MRWA Approved Patch Liners aredefined in Sydney Water documentACP003: List of Deemed to ComplyProducts for Pipeline Rehabilitation.

D. Mechanical inserts and patch liners needto be installed as per the manufacturersinstructions and QA procedures.

E. Pre and post installation Visual Recordsas per Table 500-D shall be provided tothe Water Agency.

Limitations & Requirements:a. Mechanical inserts approved in MRWA Products Portal may only be used

to repair small defects (ie: defects or openings < insert length minus 300).b. Mechanical inserts shall not be used on lined sewers.c. Maximum 4 inserts or patches per sewer. Should more than 4 be required,

obtain Water Agency approval or reline sewer from maintenance structureto maintenance structure.

d. Min 1m separation between mechanical inserts.e. Patch liners are typically about 1 meter long but two may be 200

overlapped to bridge defective pipe up to 1m long.f. For defective pipe longer than 1m, replace section of pipe as per Option 2

or reline the sewer from maintenance structure to maintenance structure.

>300>300

GROUT AS PERMRWA-S-516

Depth refers to the height between FSL and the lowest invert

PVC DWV CONNECTION PIPEWORK SHOWN. SAMEAPPROACH SHALL BE TAKEN FOR VC PIPEWORK

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JUNE 2020JUNE 2020

2020 1




S. TRIKHA

R. LEOND. STEWART

SEP 20SEP 20SEP 20

SEP 20SEP 20SEP 20


NOT TO SCALE

DECOMMISSIONING OFSEWERS AND STRUCTURES

MRWA-S-516

Sewer Decommissioning Procedure: (Assumes concrete MHs)Select and apply materials as described in Tables 500-B & C and adjacent notes.A. Remove sewer main from service (disconnect inflows).

Option 1: Seal Downstream Junctions:B. Prepare inflow channel and pipe for concrete / Compo.

B.A. Remove all drop pipe, fittings and brackets. Refer Figure 516-D.B.B. Remove greater than half of pipe within MH wall (cut or jackhammer out).

C. If grouting buried sewer line or leaving in place:C.A. Place sandbags up inflow pipe, more than 100 past structure wall.C.B. If grouting, place breather through sandbags and extend into MH and up to a

higher elevation than the highest grout level (highest obvert of sewer beingdecommissioned) plus 1m.

D. Place Bonding Agent on all surfaces which will contact concrete.E. Fill redundant shaft inflow pipe with Compo.F. Fill base channel with concrete, ensuring new concrete finishes flush with existing

table and live channel surfaces (refer Notes F & G of MRWA-S-500).G. Remove any retaining plate and plug any fastener holes in table with Compo.

Option 2: Remove SewerH. Remove sewer pipe to within 500 of maintenance structure. Alternatively, remove

adjacent sewer if note 1 from Table 516-A applies.

I. Cut sewer cleanly and install close fit cap to pipe.J. Place concrete or cement stabilised embedment all around capped pipe

down to bottom of excavation.Option 3: Grout SewerIf sewer terminates at a MH:K. Open temporary ball valve on breather.L. Where practical, open property service IO caps to allow air escape

and the property connection pipe to be grouted below the grout level.M. Place grout, slowly enough that the grout will rise from the low point without

creating any air pockets.N. Monitor the grout level in the breather and ensure that it does not overflow from

the breather by closing the ball valve if the grout level gets too high.O. Complete grouting of the sewer until the pipe is full. Allow grout to set (ie: >24 hrs).P. Trim off breather pipe flush with the table or wall surface. Reuse ball valve if

functional.If sewer terminates at a pipe connection, MS or MC:Q. Block the end of pipe by (i) grouting the downstream line as above, (ii) installing

mechanical insert or patch liner (refer Fig 514-A & B), or (iii) installing a plug.R. Insert grout placement Tremie hose down pipe sewer to just before end of line.S. Pump grout down Tremie hose in one continuous operation while retracting the

Tremie hose at a speed to match the pump rate. Grout until pipe is full.

FIGURE 516-E: MH BASE JUNCTIONSEAL, PRE GROUT PLACEMENT

NEW CONCRETE

TEMPORARY PLATETO RETAIN CONCRETEIF SEWAGE LEVELABOVE INVERT

BREATHER.DN50 SOLVENTWELDED PVCPRESSURE PIPE

SANDBAGS

TEMPORARY BALL VALVESET BALL VALVEABOVE HIGHESTOBVERT OF PIPE TOBE GROUTED + 1m

FIGURE 516-F: MH BASE JUNCTIONSEAL, POST GROUTED SEWER

TRIM PIPE SO FLUSHWITH TABLE ONCEGROUT HAS CURED

GROUT

TYPICAL SITUATION WHERE OPTION APPROPRIATE

SHALLOW SEWER and UNPAVED SURFACE

ALL DECOMMISSIONED SEWERS

DECOMMISSIONING OPTION

FIG 516- G and H

FIG 516- B to J

TABLE 516-B: SEWER DECOMMISSIONING OPTIONS

2

1

REMOVE SEWER + OPTION 1

SEAL DOWNSTREAM JUNCTION

REFERENCE

RISKS OF LEAVING EMPTY REDUNDANT SEWERS IN PLACE:a. Sewer Collapse. May lead to subsidence of the surface or neighboring structures.b. Damage from Groundwater. Empty decommissioned sewers can provide a conduit whereby ground water could

enter, accelerate and erode or scour the area where it discharges. Steep decommissioned sewers (steeper than 1 in20) and decommissioned sewers with substantial elevation change (>2m) should be grouted or removed.

c. Infiltration and inflow. Ground water may enter decommissioned assets and flow into live sewers unlessdownstream junctions are correctly sealed.

DEEP SEWERS or PAVED SURFACE or EXCAVATION IMPRACTICAL FIG 516- A to F3 GROUT SEWER + OPTION 1"SHALLOW" and "DEEP" terms defined in Table 514-B.

LIKELIHOODOF COLLAPSE

MEDIUM

HIGH

PIPE MATERIAL

ADJACENT INFRASTRUCTURE PRESENT 1 ADJACENT SIGNIFICANT INFRASTRUCTURE PRESENT

ADJACENT INFRASTRUCTURE PRESENT

TABLE 516-A: SITUATIONS WHERE SEWERS REQUIRE GROUTING or REMOVAL

PLASTIC, GRP orDEFECTIVE VC 2

CONCRETE or METALLIC

WHEN GROUTING / REMOVAL REQUIRED

LOW ADJACENT SIGNIFICANT INFRASTRUCTURE PRESENTSOUND VC 2

· "ADJACENT" can be considered to be where the seweris within the zone of influence of the infrastructure.

· "PRESENT" could be now or in the future.· "INFRASTRUCTURE" can be considered to be any

functioning asset (eg: road, footpath, residentialdwellings, shops etc).

· "SIGNIFICANT INFRASTRUCTURE" can be consideredto be any functioning asset of high importance (eg: > 3story buildings, VicRoads roads, rail, tram lines etc).

1 Only required for the part of sewer adjacent to theinfrastructure.

2 Assess condition of DN100 VC pipe where AdjacentSignificant Infrastructure present as per MRWA-S-500.

GROUTING / REMOVALREQ'D (REF) TABLE 516-A

YES

NOT NECESSARY

YES

>100

GROUTED DECOMMISSIONED SEWERAGE MAIN

FINISHED SURFACE LEVEL (FSL)

>1mBACKFILL AS PER MRWABACKFILL SPECIFICATION

FIGURE 516-A: MAINTENANCE STRUCTURE DECOMMISSIONING

IF TRAFFICABLE: AS PER ROAD OWNER'SSPECIFICATION and MIN CLASS 4 FCR.IF NON-TRAFFICABLE: GRANULAR FILL

FIGURE 516-C: MH SHAFT JUNCTIONSEAL, GROUTED SEWER

>100

TRIM PIPE SO FLUSHWITH TABLE ONCEGROUT HAS CURED

GROUT

FIGURE 516-B: MH SHAFT JUNCTIONSEAL, PRE GROUT PLACEMENT

>100

BREATHER. DN50SOLVENT WELDED PVCPRESSURE PIPE

TEMPORARY BALL VALVE

SET BALL VALVEABOVE HIGHESTOBVERT OF PIPE TOBE GROUTED + 1m

COMPO. FINISHFLUSH WITHINTERNAL WALL

FIGURE 516-D: MH SHAFT JUNCTIONSEAL, DROP PIPE CHANNEL FILL

REMOVE DROPPIPE AND FILLCHANNEL WITHNEW CONCRETE

THIS FIGURE APPLIES TO ALL SHAFT JUNCTION SEALS(FIGURES 516- C, G & I)

FIGURE 516-J: MH BASE JUNCTIONSEAL, SEWER LEFT IN PLACE

FINISH CHANNELINFILL CONCRETEFLUSH WITH EX TABLE

NEW CONCRETE

SANDBAGS

SEWER LEFTIN PLACE

FIGURE 516-H: MH BASE JUNCTIONSEAL, REMOVED SEWER

NEW CONCRETE

FIGURE 516-G: MH SHAFTJUNCTION SEAL, REMOVED SEWER

COMPO. FINISHFLUSH WITHINTERNAL WALL

CAP

>100

CAP>100

>100

>100

FIGURE 516-I: MH SHAFT JUNCTIONSEAL, SEWER LEFT IN PLACE

GENERAL NOTES:· All live sewer maintenance (cleaning) and construction work shall be

completed by a Water Agency approved contractor.· Flow control is the responsibility of the contractor. Spills are not acceptable.

SEWER LEFTIN PLACE COMPO. FINISH

FLUSH WITHINTERNAL WALL

SANDBAGS >100

>100

REMOVE ALLDROP PIPE ANDBRACKETS

REMOVE ALLDROP PIPE ANDBRACKETS

SANDBAGS

REMOVE ALL DROPPIPE & BRACKETS

EXISTINGWALL

i) Cut back > 50 of bracketinsert within wall.

ii) Fill cavity with Compo toMH inner wall surface.

DROP PIPEBRACKETWALL INSERT

COMPO

FINISH CHANNELINFILL CONCRETEFLUSH WITH EX TABLE

T

REMOVE >HALF OF PIPEWITHIN WALL

1. Grout redundant sewers, orCover channels with half pipe (one size larger than channel), sealgaps and concrete to 100 above crown of covers.

2. Remove all of structure within 1m of surface and dispose of allmaterials.

3. Backfill the excavation as per the relevant MRWA BackfillSpecification 04-03.

WALL

Maintenance Structure Decommissioning Procedure:

>50

a. Remove and dispose of the vent and base.b. Excavate and remove all buried pipework within 1m of FSL.c. Grout the buried vent pipe if required as per Table 516-A & B.

Vent Decommissioning Procedure:

PIPE SIZE

> DN150ANY

ANY

> DN150TYPICALLY ALL OF REDUNDANT SEWER SHALL BE REMOVED OR GROUTED UNLESS NOTE 1 APPLIES

FILL DROP PIPECHANNEL AS FIG 516-D

FILL DROP PIPECHANNEL AS FIG 516-D

IF SEWER TO REMAIN LIVE, PLACE ANDSECURE COVER(S) OVER CHANNELS

>300

>300

NEW CONCRETE ORCEMENT STABILISED

EMBEDMENT

> T / 2

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LIMIT:TOP

RUNG< 600

BELOWFSL &

BELOWNECK

MRWA SEWERAGE STANDARDSMELBOURNE RETAIL WATER AGENCIESDRAWN:DESIGNED:

1 2 6 7 8 9 10 12113 4 5

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R. JAGGERR. JAGGER


VERSIONISSUED

DATE:

DATE:

CHECKED:GWW

SEW

YVW

DATENAME APPROVED:

GWW

SEW

YVW

DATENAME


JAN 2020JAN 2020

2020 1PRE-PUBLISHED DRAFT1 CP / GA / NGJUN 20


S. TRIKHA

R. LEOND. STEWART

SEP 20SEP 20SEP 20

SEP 20SEP 20SEP 20


NOT TO SCALE

EXISTING CONCRETE MH HEIGHTADJUSTMENT, METHOD

SELECTION & GENERAL REQUIREMENTS

MRWA-S-518

FIGURE 518-J: NECK LOWER FIGURE 518-K: TRUNCATECONICAL TOP

FIGURE 518-M: TRUNCATECONICAL TOP & SHAFT LOWER

FIGURE 518-L: SHAFT LOWERFIGURE 518-F: SHAFT RAISE FIGURE 518-H: NECK RAISE FIGURE 518-I: EXISTINGCONICAL TOP MH

FIGURE 518-G: TRUNCATECONICAL TOP & NECK RAISE

GENERAL NOTES:1. Works shall be undertaken in accordance with the Water Agency's Confined Space procedure by a Live

Sewer accredited Contractor.2. MHs shall be inspected and measured prior to works commencing so that the appropriate height

adjustment method can be selected.3. Depending on Table 313-B, some of the provided options may be interchangeable, for example:

3.1. Figures 518-A and 518-F3.2. Figures 518-E and 518-L.ie: once the existing shaft is exposed, the MH may be rebuilt with either a Flat Top or Conical Top.

4. Where the existing MH has a shaft connection, new construction is not permitted within 500 of the shaftconnection.

5. Where MHs in a significantly deteriorated state are observed, contact the Water Agency for advice.A number of options may be considered:5.1. Rehabilitate the existing MH to be retained with a liner or Calcium Aluminate Cement CAC.5.2. Knock down the MH to the nib wall and reconstruct from that level.5.3. Decommission the MH and reconstruct a new MH over the sewer (refer MRWA-S-508 to 512 & 516).

6. MH depth may exceed 8m depth if structural assessment of the existing MH by a competent personindicates that it is structurally capable of being deepened.

7. These details may also be applied to the removal and reconstruction of cover and step ironor ladderrelocation within MHs

FIGURE 518-D: NECK LOWER FIGURE 518-E: SHAFT LOWERFIGURE 518-B: NECK RAISE FIGURE 518-C: EXISTINGFLAT TOP MH

FIGURE 518-A: SHAFT RAISE

LIMIT: > 100

LIMIT: SHAFTHEIGHT 1000

FLAT TOP MH HEIGHT ADJUSTMENT OPTIONS:

CONICAL TOP MH HEIGHT ADJUSTMENT OPTIONS:

LIMIT: < 8m

CUT LINE FORFIGURE 518-E OPTION

REMOVE FLAT TOP,CUT AND REMOVE

UPPER SECTION OFSHAFT & REPLACE

FLAT TOP

REMOVE FLAT TOP,ADD SHAFT &

REPLACE FLAT TOPCUT LINE FORFIGURE 518-D OPTION

CUT LINE FORFIGURE 518-B OPTION

LOWER NECK, orREMOVE NECK &PLACE NEW NECK,COVER & FRAME

CUT & REMOVEUPPER SECTION OF

NECK, EXTEND NECKWITH NEW COVER &

FRAME

NEW & OLD CONCRETEINTERFACE

NEW & OLD CONCRETEINTERFACE

LIMIT: < 900

HEIGHT: REFTABLE 313-C

HEIGHT OPTIONS

LIMIT: < 8m

NEW &OLD

CONCRETEINTERFACE

REMOVE CONICALTOP, ADD SHAFT &NEW CONICAL TOP

CUT LINE FOR FIGURE518-L & M OPTIONS

CUT LINE FORFIGURE 518-F OPTION

CUT LINE FORFIGURE 518- K

OPTIONS

PRIOR APPROVALREQUIRED AS MH

BECOMES NON-ENTY.

TRUNCATE CONICALTOP, ADD NEW 750ID

NECK

LIMIT: NONECK

CUT LINEFIG 518-J

CUT LINE FIG 518-H

REMOVE COVER &FRAME AND RAISE

NECK

REMOVE SECTIONOF NECK REMOVE NECK AND

SECTION OFCONICAL TOP REMOVE NECK,

CONICAL TOP ANDSECTION OF SHAFT.

REBUILD TO NEWSURFACE LEVEL

REMOVE NECK, CONICALTOP AND SECTION OF

SHAFT. ADD TRUNCATEDCONICAL TOP

FLAT TOP MH Height Adjustment:A. Existing flat tops may only be reused if they are in excellent condition (ie: no discernable loss of material, concrete is

hard such that it does not flake or spall when hit with a hammer, lift anchours in new condition).B. Where the frame is cast into the neck and it is in corroded or in poor condition and the conversion slab (flat top) is in

good condition, the neck may be removed and rebuilt on the existing conversion slab if conversion slab is to be reused.

LIMIT:NOSHAFT

CONVERSION SLAB

NECKSHOWN AS EXISTING.

MAY NEED TO BE NEW(REFER NOTES A & B)

SHOWN AS EXISTING.MAY NEED TO BE NEW(REFER NOTES A & B)

REFER FIGURE 313B-A REFER FIGURE 313B-BREFER FIGURE 313B-B

REFER FIGURE 313B-C

REFER FIGURE 520-D or E

REFER FIGURE 520-F or G

REFER FIGURE 520-F or GREFER FIGURE 520-J REFER FIGURE 520-H & I



LIMIT: TOPRUNG < 600FROM FSL& BELOWNECK

EXISTING MH

EXISTING MH

REFER FIGURE 313B-C REFER FIGURE 313B-C

HEIGHT: REFTABLE 313-C

HEIGHT OPTIONS

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VERSIONISSUED


DATE:


1 2 6 7 8 9 10 12113 4 5

H HGWW

SEW

YVW

DATENAME APPROVED:

GWW

SEW

YVW

DATENAME


A

1 2 63 4 5

B

C

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1 2 6 7 8 9 10 12113 5

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R. JAGGERR. JAGGER

JAN 2020JAN 2020

2020 1




S. TRIKHA

R. LEOND. STEWART

SEP 20SEP 20SEP 20

SEP 20SEP 20SEP 20


NOT TO SCALE

EXISTING CONCRETE MHHEIGHT ADJUSTMENT,

CONSTRUCTION DETAILS

MRWA-S-520

F.S.L F.S.LNON ROADPAVEMENTOR SOIL

NEW MAKEUP RING

NEW COVER

<600

FIGURE 520-D: LOWERED CONE TOP MH NECK IN ANY SITUATION

NOTES Regarding All Height Alterations:· Arrangements shown are suitable for both conical and flat

top MHs unless otherwise indicated.· All figures are shown in the finished altered state.· Re-grease all frames prior to replacement of covers.· All frames and covers shall be new and as per Table 313-E.· New cover shall be the same size as that removed unless

otherwise stated.· Place covers over live channels to collect debris and ensure

that no content enters the sewer.

FIGURE 520-E: LOWERED MH NECK OUT OF ROAD PAVEMENT

CONCRETE SURFACEIF PAVEMENT

CONCRETE SURFACE IF SOIL

F.S.L

MASTICWEDGES (x 3)

FIGURE 520-G: RAISED MH NECK OUT OF ROAD PAVEMENTFIGURE 520-F: RAISED MH NECK IN ANY SITUATION

F.S.L

TOP RUNG LEVEL TOP RUNG LEVEL

NEW COVER ASPER TABLE 313-ENEW COVER

<900

FIGURE 520-J: TRUNCATED MH CONE WITHRAISED 750Ø NECK TO SURFACE

F.S.L

FRESHCONCRETE

POSSIBLEOUTLINE OF

ORIGINAL 600ØNECK

CUTTING EXISTING CONCRETE:A. Ensure only MHs in sound condition are cut.B. Jack hammer demolition not allowed.C. Ring or demolition saw cut, or

D. Plug and feather cut.E. Where mastic joint to be used, cut surface

must be flat with surface irregularities <5mm depth.

LADDER / STEP IRON ALTERATION PROCEDURE:Ladder and step irons shall be installed / modified in accordance with MRWA-S-314.1. Cut down ladder or remove step irons as required (to <600 from new FSL).2. If Figure 520-J being constructed: (i) if ladder / step irons in poor condition, remove all (structure becomes

non-entry), or (ii) if ladder / step irons in good condition, apply note 1.3. Install new ladder support brackets as required as per Figure 314-D.4. Extend ladder from existing ladder using brackets as per Figure 314-B.5. Add new step irons as per Figure 314-E when raising MHs.6. If a landing is present, it shall be left in place unless impractical to do so. New landings need not be added.

Pre-cast construction joints not permitted for MH's < 12 months old.MASTIC + PRECAST COMPONENT PROCEDURE:1. Cut neck / cone / shaft (refer cut instructions).2. Place mastic primer on both surfaces.2. Place 25 wide triangular bromo butyl mastic around top surface.3. Locate precast item (frame, flat top, ring segment) with wedges.4. Place precast item centrally.5. Place new rapid set concrete around joint perimeter, > 2T wide and

> 200 deep (flat top on vertical shaft does not require this).6. Place new cover & return to normal service.

CONCRETE SPECIFICATION:a. Concrete quantities > 0.5m3 shall be approved fresh

plant mixed 32 MPa concrete trucked to site.b. Concrete quantities < 0.5m3 may be mixed on site using

50 MPa structural concrete (ie: not "builders" concrete).

IRREGULARLY SHAPED ORBRICK EXISTING MH SHAFT

CONVERSION SLABOUTER EDGE

IRREGULARLYSHAPED ORBRICK EXISTINGMH SHAFT

NEW SHAFT

REINFORCEMENT AS PERTABLE 313B-D & MRWA-S-309

CONVERSION SLAB INTERNALDIAMETER TO SUIT NEW SHAFTINSIDE DIAMETER

SLAB OUTER EDGE. DIMENSIONS:> NEW SHAFT OUTSIDE DIAMETER, &> LOWER SHAFT OUTSIDE EDGE

XY

A

MASTIC

HOOP AND OUTER BARS TO BE N20.ADD OUTER BAR IF SL81 MESH USED.

INNER DIAMETER OFCONVERSION SLAB MAYBE FOR 600 or 750 NECKOR 1050 / 1200 SHAFT

CONVERSION SLAB.REF FIG 313B-D

THIS OPTION REQUIRES WATER AGENCY APPROVAL.

B-

A-

FIGURE 520-K: SECTION A: CONVERSION SLAB

FIGURE 520-L: SHAFT SHAPE OR DIAMETER CHANGE

FIGURE 520-M: SECTION B: COMPONENT OUTLINES

NEW UPPER SHAFTOUTSIDE DIAMETER

<600

NEW SHAFT.ENSURE ID BETWEEN X & Y.ENSURE OD > A.

REF FIG 520-A

FIGURE 520-H: TRUNCATED MH CONE & PRECAST FRAME

F.S.L

FIGURE 520-I: TRUNCATED MH CONE & CAST IN SITU FRAME

F.S.L

NEW COVER AS PER TABLE 313-C(750 ROUND COVER SHOWN)

REFER FIG 520-A or B


REF PER FIG520-A or B

· Lip of precast concrete frame surround may need to be trimmed to fit within the recess ofthe make up ring.

· Proprietary MH adjustment rings systems approved by the Water Agency (eg: Cretex)may be used in lieu of the above. Install as per manufacturer's installation instructions.

50 to75

>200

>200

NEW CAST IN SITUCONCRETE

> N12 DOWEL (x4)EQUI-SPACED AROUND

PERIMETER

ADHESIVE CAPSULE

EXTEND INTO NEWCONCRETE AS LONG AS

POSSIBLE UP TO 200

MORTAR

30-50

>50

FIGURE 520-C: PRE-CAST CONSTRUCTION JOINT

FIGURE 520-A: DOWEL CONSTRUCTION JOINT

FLAT CUTSURFACE

REMOVE LIPFROM PRECASTSURROUND IFREQ'D

FRAME &PRECASTSURROUND

FRESHCONCRETE>200

REF PERFIG 520-C

REF PER FIG520-A or B

REF PER FIG 520-C

SHALLOW PLAIN CONCRETE CONSTRUCTION JOINT SHOWNFOR FLAT TOPS, WHERE NECK CUT TO < 100 HIGH, REMOVE ALL OF EXISTING NECK

MHs IN TRAFFICABLE AREAS MAY NOT BE TRUNCATED

REF PER FIG 520-C

CAST IN SITU PROCEDURE:1. Cut neck / cone / shaft (refer

cut instructions).2. Scabble / roughen cut surface,

exposing aggregate.3. Place internal (& external if

preferred) formwork.4. Place mortar over cut surface.5. Pour new concrete to F.S.L

6. Place new frame within wetconcrete & finish surface.

7. Steel plate over work area if intrafficable area.

8. Wait until 60% cure strength(ie: 24 hrs normally).

9. Strip formwork, Compo formsupport holes, place new cover& return to service.




750

NON ROADPAVEMENTOR SOIL

NEW COVER

REMOVE LIPFROM PRECASTRING IF REQ'D

100 to 200

FIG 520-B: PLAIN CONCRETE CONSTRUCTION JOINT

2T

30-50

>200 >50

FRESHCONCRETE

CONCRETESURFACE IFPAVEMENT

CONCRETESURFACE IF SOIL

>200

100 to 200

TALLER DOWEL CONSTRUCTION JOINT SHOWN

REF PERFIG 520-A

>200

ROUGH SURFACE

MORTAR

ROUGH SURFACE

FLAT OR CONE TOP

FLAT OR CONE TOPFLAT OR CONE TOP

T

2T T

FLAT OR CONE TOP

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mrwa sewerage standards

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