Second Vivekananda Bridge
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PROJECT: SECOND VIVEKANANDA BRIDGE PROJECT PICTURES (CLICK TO VIEW LARGER IMAGE)
The second Vivekananda Bridge is part of new 6.1-km highway located north of Kolkata, India. The bridge main bridge is 880m (2,890 ft) long, and carries six lanes of traffic over the Hooghly River.
The profile of the main bridge was tightly constrained both above and below. However, foundations in the deep, soft soils were quite expensive, so an alternative was sought to minimize the overall structural depth while maintaining a limited number of piers.
The solution was a precast segmental “extradosed” bridge. The extradosed tendons allowed the constant depth box girder to reach a
SECOND VIVEKANANDA BRIDGE
Page 2 of 2
span length of 110 m (360 ft) while maintaining a low profile. Each 28.6m (94 ft) wide span consists of a single cell concrete box girder, stiffened by internal struts.
Expansion joints are located at mid-span to simplify the balanced cantilever construction. Steel beams placed inside the box girder provide moment resisting capacity for concrete creep redistribution effects and live loads.
The superstructure is monolithically connected to cast-in-place pier shafts supported on 45 m (148 ft) deep caissons. The caissons are circular and the caisson caps are located at riverbed level to reduce scour.
Speed of construction was critical due to high current and flooding following the monsoon season. Work in the river was limited to eight months per year.
IBT was responsible for the design of the main bridge structures. IBT also provided construction support for casting and erection.
Design / Build Contractor: Larsen and Toubro Design Consultant: CES / PB Consortium Subconsultant for main bridge design: International Bridge Technologies, Inc.
PROJECT: SECOND VIVEKANANDA BRIDGE PROJECT PICTURES (CLICK TO VIEW LARGER IMAGE)
The second Vivekananda Bridge is part of new 6.1-km highway located north of Kolkata, India. The bridge main bridge is 880m (2,890 ft) long, and carries six lanes of traffic over the Hooghly River.
The profile of the main bridge was tightly constrained both above and below. However, foundations in the deep, soft soils were quite expensive, so an alternative was sought to minimize the overall structural depth while maintaining a limited number of piers.
The solution was a precast segmental “extradosed” bridge. The extradosed tendons allowed the constant depth box girder to reach a
SECOND VIVEKANANDA BRIDGE
Page 2 of 2
span length of 110 m (360 ft) while maintaining a low profile. Each 28.6m (94 ft) wide span consists of a single cell concrete box girder, stiffened by internal struts.
Expansion joints are located at mid-span to simplify the balanced cantilever construction. Steel beams placed inside the box girder provide moment resisting capacity for concrete creep redistribution effects and live loads.
The superstructure is monolithically connected to cast-in-place pier shafts supported on 45 m (148 ft) deep caissons. The caissons are circular and the caisson caps are located at riverbed level to reduce scour.
Speed of construction was critical due to high current and flooding following the monsoon season. Work in the river was limited to eight months per year.
IBT was responsible for the design of the main bridge structures. IBT also provided construction support for casting and erection.
Design / Build Contractor: Larsen and Toubro Design Consultant: CES / PB Consortium Subconsultant for main bridge design: International Bridge Technologies, Inc.
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