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PROVISION OF LIMITED USE SUBWAY-COMPARISON OF CUT & COVER METHOD

Vs BOX PUSHING TECHNIQUE

1. Introduction: Many level crossing are planned to be closed bydiverting to either existing level crossing, existing bridge or byconstruction of new RUB. Earlier work for new RUB are proposed tobe constructed by using push through technique. Then it is proposedto carry out work by cut & cover method which has greatly enhanced

the economy. This paper deals with the comparison of these bothtechnique.

2.RBs policy of closing LC gate : As per latest RB policyvide letter no 2006/CE-I/MISC-2(RUB) dated 25/2/2008 , the closingof existing level crossing gate may be planned by provision of limiteduse subway having dimension not more than 4m X 3.6 m in planhead 30. ME also directed there will be no constraint for fund in thisplan head.

3. Work Planned : Accordingly different work proposed the

details of them are as follows:Diversion through existing LC- 14 NosDiversion through existing bridge- 7 NosDiversion through newly constructed limited use sub way 8 Nos

On single line section 3 nosOn double line section 5 nos

Diversion through newly constructed normal height sub way- 1 Noson double line

4.Box Pushing technique : Three work for closing of levelcrossing no. AP22, AP26 and AP34 are sanctioned in PH 30 in lawbook each having sanctioned value of Rs 43 LakhsThe Scope in this work was as follows:

Construction of thrust bed.Casting of box segment along with cutting edge.Pushing of box segment by using hydraulic jacks.


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Item proposed in this work are as follows:

NS-1

Casting jacking precast RCC Boxminimum M-45 grade concrete mix,below Railway track under running trafficconditions by box pushing techniqueincluding providing thrustbed and casting arrangements withcontractors design, providing drag sheeton top of box, providing intermediate

jacking points if required, dewateringincluding alltemporary works making joint of boxwatertight with all contractors men,machinery, and material required forcarrying out work in all respect for RCCBox thrust bed. (Rate Rs. 21312.50 forone meter 2 / permeter length. Size of box 4.00m X3.50m) (inside dimensions)

M 298375.00 10 2983750.00

The percentage received are 95.786% Above the basic cost

Cost per meter for pushing the segmental box other than wing wall,return wall etc = Rs 5,81,831/-

Payment schedule for Box Pushing item proposed are asfollows:

After approval of all Relevant Drawings by H.Qrs : 2%After completion of Thrust Bed & anchors : 10%After Casting of Box segment : 40%After pushing full length of RCC Box (Box pushing length asprescribed in schedule or as per site requirement) : 43%After completion of all work : 5%

After considering the lowest offer value the offer comes out tobe Rs. 73.5 Lakhs per level crossing. There are guidelines from thecost of RUB should not exceed Rs 50 Lakhs

So alternative method for execution are studied and it is noticedthat similar type of closing 11 unmanned level crossing by using cutand cover method on Guna-Maksi was carried out recently on Bhopal


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division. The method studied and same is applied for provision oflimited use subway.

5. Cut and cover method : The various activities involved are:a)Casting of box segment each of 2 m length- 5 Nos

Size of box 3.5 X 4.0 clear dimensionThick ness of box 400 mm

Weight of one segment 13.28 m3 X 2.5 t/ m3 = 33.2tones

b)Placement of segmental boxes in traffic blockCrane of 120 t capacity required

Capacity of crane required at 8 m radius will at least be

50 tQuantum of earth work = 118 m3 before block + 200 m3during block

2 Hitachi pocklain of 225 capacity will be required forthis v olume of earth work to be execute in 1.30 Hrs

Item proposed in the work are as follows:NS-10

Placement of precast RCC segmental Box

with the help of road crane at desiredlocation,carefully by lifting and pack ing method,

during traffic and power block with all

contractor labour tools and material, crane,machinery, preparation of surface as directed

by Engineer, including filling of joints byepoxy mortar and laying of required sand

including cost of epoxy and sand, includingall material and labour, tools, plants,machinery etc. with all lead and lift.

MT 2200.00Rs.TwoThousandTw o

Hundred

And PaiseNil Only

190 418000.00

Prov iding RCC M-40 controlled concrete insegmental box with 20 mm crushed stone

agreegate including form w ork, shuttering,

staging, mixing placing vibrat ing etc.complete as directed by Engineer in-charge.

M3 5000.00Rs.Five

Thousand

And PaiseNil Only

78 390000.00

Supplying MS plain / Tor steel barsconforming to IS specification andtransporting to site including loading andunloading w ith all contractors labour, tools

and plant complete. Note- 1) Provision forwastage / rolling margin/overlaps is includedin basic rate. 2) Payment against w ork done

will be made in accordance w ith the specialconditions for contract with contractors steel.

3) Specification of the above item as perspecial condition w ith contractors steel are

MT 30220.59 12 362647.08


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attached.

Sanctioned value per bridge 43 Lakhs Offer value for per bridge- 35.78 Lakhs

Cost of barrel length per meterCost of concrete = 6.14 m3 X 5000 X 1.30 = Rs

39910Cost of steel = 36264 X 1.30 = Rs 47,143Cost ofplacement = 6.14 X 2.5 X 2200 X 1.3 =Rs 43,901Cost of earthwork, epoxy & misc item = 15,000Total

= Rs 1,45,954 per meter

6. Box pushing Vs Cut & cover method : By adopting Cut& cover method there will be saving in cost per Level crossingof by Rs. 23.5 lakhs

Supervision required for box pushing will not be required.Hence more work can be planned with existing staff

There will be joint at every 2m which is not desirable There will be requirement of traffic block of 4 Hrs and also

possibility of disruption to traffic in event of crane failure There is saving of Rs 4,35,877 per meter barrel length (Rs

5,81,831 - 1,45,954 )

In big yards having of number of lines the same technique maynot be utilized

7. Conclusion : Cut & cover method is more economical for singleline work. The same may be used in double line section in electictraction which will cost Rs. 75 lakhs for closing existing level crossing

as against sanction upto 1.5 Cr for which proposal are beingsanctioned in RB level. Box pushing technique gives less joints in

imbakment and do not require traffic blocks. but may cost more. Iflonger barrel length cost of box pushing gets lesser and may becomecomparable with cut & cover method which may be worked out.


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PROJECT REPORT

PROVISION OF LIMITED USE

SUBWAY- COMPARISON OFCUT & COVER METHOD

Vs BOX PUSHING TECHNIQUE

PRESENTED BY

Sh. Vinod M. BhangaleSr.DEN/N/NGP

Kind Guidance By

Sh. A.K.Goyal

Sr.Prof/Br-I

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