MEGASTRUCTURES

BANDRA WORLI SEA-LINKBANDRA WORLI SEA LINK

Presented By

TE ( CIVIL)Ankita Pal

SSJCET

INTRODUCTION

Officially known as Rajiv Gandhi Sea Link.

Cable-stayed bridge with pre-stressed concrete-steel viaducts.

Links the Bandra (Western suburb) and Worli ( South Mumbai).

Inaugurated on June 30 , 2009.

Among the most complex & advanced construction projects ever in India.

Designed By : Sheshadri Srinivasan (Structural engineer , Working in Lebanese Engineering Firm Dar-Al-Handshah )

Commissioned By : Maharashtra State Road Development Corporation

Constructed By : Hindustan Construction company , India ( HCC)

HISTORY Mahim Causeway was the only link connecting westernsuburbs to island

city of Mumbai, making it highlycongested during the peak hours .

Vehicular traffic admeasuring about 120,000 PCUtravels on the Mahim causeway everyday and during peak hours and it takes about forty minutes to travelfrom Mahim causeway to Worli, a distance of about 8km.

LOCATION

BASIC INFO Official Name “ Rajiv Gandhi Setu ”

Carries 8 Lanes of Traffic

Owner MSRDC

Design Cable-stayed, Concrete-Steel precast viaducts

Total length 5.6 Km ( 3.5 miles )

Width 2 20 m ( 66 ft ) Highest Point 126 m ( 413 ft ) Longest Span 2 250 m ( 820 ft ) Vertical Clearance 20 m ( below bridge for transportation )

Foundation Type Pile Foundation Toll System Automated 16-Lane Toll Plaza

Time Frame

Estimated Time Frame : 5 years Construction begin : June 1995 Construction end : March 2003

Actual Time Frame : 11 years Construction begin : October 2000 Construction End : 24 March 2010 Opened : 30 June 2009

BUDGET

Estimated Cost : ₹ 665.81 Cr Actual Cost : ₹ 1653.25 Cr

The Increament in project cost was due to payments of escalation 213 ₹Cr on account of inordinate delay in completion (61 months ) .

New technical changes in the bridge at the behest of new consultant 70 Cr ₹.

Contractor for delay in award of work 125 Cr .₹

Interest liability due to delayed completion 230 Cr .₹

PIERS : The span between the piers is 50 maters .

This distance arrived by considering optimization between foundation cost Vs. superstructure cost .

If the piers are wide apart then foundation cost comes down , but the superstructure becomes heavier and its cost goes up .

Moreover, more number of piers provide better wind resistance .

CABLE WIRE Are also known as  ‘ Parallel Wire Stay Cables ’.

Manufactured  by “Shanghai Pujiang Cable Co. Ltd” China .

Each cable consists a group of steel wires ( 6 wires ) .

Each steel wire has a diameter 7mm with a breaking limit of 6.28 Tones.

  Group of these wires was packed in two layers of HDPE (High Density Poly Ethylene) material .

Highly uneven and variable foundation bed even for plane area of one pile .

The maritime Board does not allow marine traffic in monsoon season . Thus work was halted Mid-May only to re-commence in October . Effectively reducing the work schedule to only seven month in a year .

Needed for extra steel trusses , further experts .

Delay due to change in design of stray Cable .

BENEFITS

Considerable savings in travel time from 40 min to 8 min

Estimated savings in fuel and vehicle operating cost is around $ 16.2 million .

Stress free driving . Reduced accidents and noise pollution . Reduction in air pollution .

ANY DOUBT