technical archives

2006_0515CA.pdf

DATE: May 2006

CLIENT: Young Homes, Rancho Cucamonga, CA

LOCATION: Perris, CA (Riverside County)

JOB: Replace 360' sewer main under county roadway,

upsizing 10" VCP trunk line with 14" SDR17 HDPE

SPECIAL CONDITIONS: 24-hour flow bypass, mandatory fusion couplings

EQUIPMENT: TRIC 100-ton Crowder ram, grippers for 1.5" standard wire rope,

custom TRIC 16" diameter steel pulley base, custom TRIC 14" roller-bearing static bursting head,

PowerTeam 20HP high-pressure hydraulic pump, excavators, water truck

PROJECT LOG

1

January 9: Unloading nine 40’ sticks of SDR17 HDPE pipe.

January 9 and 10: Fusing pipe.

2

January 10: Fusing pipe.

March 15: TRIC founder Ward Carter welds shackle to 1.5” cable end (for pulling through sewer

with smaller 3/8” cable).

3

May 9: Attaching head.

May 9: 360 feet of pipe ready to pull.

4

May 10: Cutting the street. A 25’ long ramp leads to a 10’ long shored pit upstream from lower

manhole. Pipe at invert to manhole roughly 9’ deep.

May 10: Digging the entry pit and ramp. Pull will be against grade, and sewer will be fl ooded with

fresh water from upstream exit pit to assist static bursting head.

5

May 15: Zednem Construction crew drags pipe into entry ramp.

May 15: Positioning 100-ton TRIC puller. Pit is larger than necessary because pull was originally

planned from behind a narrower shoring box.

6

May 15: Working with grippers and cable. TRIC technicians John Rafferty (in pit) and Bob

Zamaroni make various adjustments.

May 15: Gripper tread strips under load, and ram slams against side shoring plate, breaking upper

hydraulic fi tting and pressure gauge connection.

7

May 16: Repaired ram and grippers working fi ne. Bob Zamaroni of TRIC checks setup.

May 16: Ram is safety-strapped to street plate. Sewer is fl ooded and pull continues. Five minutes

later, high-pressure hydraulic pump fails.

8

May 17: Alternate large high-pressure pump is located and pull is resumed.

May 17: John Raff erty carefully adjusts grippers and retainer plates to cable path.

9

May 17: High pressure ram pulls slowly but steadily. Steve Gabrielson of Young Homes looks on.

May 17: Night falls. Ram leaks as pressure rises and hydraulic fl uid gets hotter. Each stroke must be

closely monitored to ensure that enough pulling force remains to release cable from ram.

10

May 17, 9:30 PM: Pull is fi nished.

May 17: Disassembly and cleanup takes another hour. Overall, burst requires three days.

11

May 18: Busy street manhole connection made fi rst. EMWD inspector checks inlet.

May 18: Electrofusion coupling at street manhole cools aft er controlled heating.

12

May 18: Head cut free. As expected, new pipe comes in above grade due to greater compaction in

undisturbed soil underneath original trench.

May 18: Manholes are core-drilled for new pipe. 16” diameter ports required.

13

May 19: Cleaning and scoring pipe for upstream electrofusion coupling. Diff erent brand coupling

will not work with fusion unit, and a compatible fusion unit must be found.

May 19: Inserting pipe into upstream manhole. 30’ section with coupling stands overnight, and

matching fusion unit is obtained the following morning.

14

May 20: (Saturday) Drying condensation between coupling and pipe before fusion.

May 20: Aft er second coupling cools down, new 350’ sewer line passes pressure test.