AFCONS Questionaire Ground Supp Bridge Launching 16-07-13 (3)

8/10/2019 AFCONS Questionaire Ground Supp Bridge Launching 16-07-13 (3)

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What was the pr imary goal of the project and how was i t achieved

Barapulla Elavted Corridor Phase-I and Phase-II are one of the esteemed infrastructureprojects for citizens of Delhi. In such old and congested city, Barapulla elevated corridorprovides connectivity between the central part of city to its westerner part, rendering a longsignal free path. The phase-I was completed in year 2010 for the common wealth games held

in India. Now the phase-II, is under construction by Afcons Infrastructure Limited for thePublic Works Department, Delhi (PWD). Both these phases fall under fast-track categoryprojects as Govt. of Delhi has promised to put them in public use by Yr. 2015. The citizens ofDelhi are keen to see the developments of phase-II also.

The alignment of phase-II starts from INA market and reaches right upto Sarai Kale KhanArea. Major portion of the alignment passes over an existing wide open drain (nalla) and atcertain places passes over existing crowded locality, roads, railways, pipelines and otherestablishments. There are new seven ramps to be provided to allow ascending / descendingof the traffic. Thus the launching of the bridge superstructure has to be done along thecongested path, but within very much limited time frame available. This demanded a veryefficient yet affordable bridge launching system. A major portion of the bridge alignmentconsists of precast box segments to be launched with the system explained hereunder. Apartfrom Box-Segments certain stretches consists of Pre-Tensioned I Girder, Balance cantileverspans, concrete voided slabs and one steel Arch bridge (but the overall contribution of otherbridge configurations is very less). The box segment spans are of three-span continuous type(each span of average 30m length).

What obstacles did you face with in the project? Were you able to ov ercome thesechal lenges?

The alignment is passing through congested areas and it has very steep gradients, super-elevations and curvatures in plan. The launching is required to be done without affecting theexisting traffic hence conventional launching system became difficult. The feeding ofsegments and other equipments from casting yard to the work site is allowed during limited

hours in night time.

A innovative ground supported bridge launching system was planned and designed for thisproject using STAAD. The entire analysis, design / detailing was done with Stadd-V8i versionand proved to be extremely satisfactory. The software enabled greater ease in optimization ofcertain member forces and sizes.

List al l Bent ley produ ct and services involved with the project?

STAAD-Pro

How m any people were members of the project team?

Three

Please indicate which phase your no minated projects is cu rrent ly in

The project at present is under construction.

Locat ion of project

Elevated Viaduct Barapulla (Phase-II), from INA market to Sundial Park, New Delhi, India

What was the capi ta l cost of the project?

Approximately 340+Cr INR.


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Please provide speci f ic examples of the benef i ts , ROI and t ime or m oney s aved b yusing B ent ley produ cts and services

The launching operation of bridge superstructure is popularly done using an equipment calledLaunching Girder or a Launching truss (or simply LG / LT). The LGs are of two types

underslung and over-head type, and both are usually very heavy; as per thumb rule inconstruction industry the weight of LG is approximately equal to the weight of the individualbridge span to be erected. Even the length of the LG is approximate twice the length of thespan to be erected, which gives operational comfort. The LG can operate well in fairly flatbridge alignment or with gentle longitudinal gradient (say up to 2%) and moderate curvaturesin plan (say upto 300m radii). Lag can launch simply supported spans more comfortably.

In the present project the bridge alignment has a very steep gradient (max 4.3%) and verysharp radius of curvatures (upto 75m) and continuous spans. The Ground Supported BridgeLaunching system design and detailed using Staap-V8i was very much efficient to optimizethe cost and design & construction time. The weight of the system was almost one-third of theconventional LGs, and even the length could be limited to individual span length. As thesystem was very light weight, it gave handling ease to construction workers at site. In spite of

being very light weight, the system can work well in water logged areas, and area with softsoils also.

Thus this job is an excellent example of creative use of the software to achieve cost and timesaving in addition to functional ease at work site.

Was col laboration technology emp loyed to

NA

Has the pro ject uti l ised visu alizat ion capabil i t ies to enhanc e the quality and/orproduct iv i ty o f the del ivered project? I f yes, please l is t products used.

Yes-Staad.Pro

Did this pro ject optim ize the use of natural resourc es, or reduc e/mit ig ate the effects ofhuman act iv i ty on the environment? i f yes, please expla in how and why.

The use of Staad.Pro software resulted in generating lighter design which satisfied functionalcriteria within short time and with least man power allocation.

Has your organizat ion demons trated a commitment to expanding the size, qual i ty orlongevi ty of global pool o f infrastructure professional?

NA

Please provide a quotat ion about the benef i ts der ived from the us e of Bent leysoftw are/services on the project.

NA

Can we use your name with th is quote?

YES, AFCONS INFRASTRUCTURE LIMITED

Why should th is project win?


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Often the Staad software is used by consultants and structural designer for routine structureslike buildings, portal-frames, sheds, bridges etc. All these are permanents structures, unlikethe ground supported staging system described herein, where the all resources (time,material, machinery and workers) were available in a limited range; and the construction hadto be done without affecting existing traffic without demanding specified time limit.

Thus this job is an excellent example of creative use of the software to achieve cost and timesaving in addition to functional ease at work site.

Fig.1 Showing a Typical a view of three span bridge module(each module is about 90m long and such 33 modules are to be lanched)

Fig.2 Showing a Typical a view of Ramp-A (sharp radii of curvature can be seen)


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Fig. 3 Typical view of the

Fig. 4 Typical view of the Erection system

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AFCONS Questionaire Ground Supp Bridge Launching 16-07-13 (3)