डिब्रुगर्ह Dibrugarh (DBRG): Minister of State for Railways Manoj Sinha in his written reply to a question in Rajya Sabha mentioned that Physical works of both North and South guide bunds, 44 km long rail link from Chaulkhowa – Moranhat, 14 km long north bank rail link and 8 km long south bank rail link of Bogibeel rail-cum-road bridge over river Brahmaputra have been completed. In main bridge, 36 out of 42 well foundations and 28 out of 40 piers have been completed. 2 out of 41 girders have been launched. The project has been targeted for completion by March 2017.
Bogibeel rail-cum-road bridge was sanctioned in 1997-98. Latest anticipated cost of the project is Rs. 4996 crore and an expenditure of Rs.3041 crore has been incurred upto March, 2014. An outlay of Rs. 600 crore has been provided for the year 2014-15.
Rail-Cum-Road bridge site has been located at approx. 17 Km downstream of Dibrugarh Town. The road approaches are connected to NH No.37 on south bank at Km. 580.788 and to N.H. No.52 on north bank at Km. 307.826 .
The rail approach is connected to Chaulkhova Railway station at a distance of 5.83 Km. from Dibrugarh Town and between Sisibargaon Siripani Railway Station on north bank at 382.005Km. of the existing MG track (which is being converted to B.G. Track).
The 4.94km bridge is one of the longest river bridges in the country. The rail-road bridge is being undertaken by the Northeast Frontier Railway, which is a part of Indian Railways. The work on the project began in 2002. The Bogibeel rail / road bridge is being built over the Brahmaputra River,northeastern India.The project is now scheduled to be completed by the end of 2016.
River Brahmaputra bridge design and construction
The Bogibeel Bridge is a welded-steel-truss-and-reinforced-concrete structure. It spans 125m and has strong box-type built-in sections. The bridge is supported on well foundations and 42 piers.
The project got the approval of the federal Cabinet Committee on Economic Affairs (CCEA) in September 1997 and construction began in April 2002.
Major earthworks and strengthening of the north and south dykes were completed by June 2011. As of the end of 2011, 13 well foundations on the south bank and 11 well foundations on the north bank are in progress for the main bridge.
Contractors involved in the Bogibeel rail-road bridge in Indian state of Assam
The state-owned consultancy and project management enterprise Rites (Rail India Technical and Engineering Services) has undertaken the pre-construction studies and detailed design of the rail-road bridge.
Top-Notch Engineers was involved in the design and drawings of the bridge.
The well foundations and substructure of the bridge are being constructed by Gammon India under an INR3.44bn ($64.62m) contract.
Assam-based Bharatia Infra Projects has supplied aggregates for the bridge under an INR540m ($10m) sub-contract from Gammon India.
Bharatia Infra has constructed the guide bunds and approach embankments on the south bank of the bridge. A joint venture of Hindustan Construction Company (HCC), Germany-based DSD Brouckenbau and VNR Infrastructures will build the superstructure of the bridge under an INR9.87bn ($185m) contract awarded in November 2011.
The superstructure is planned to be completed in 48 months. HCC holds a 51% stake in the JV while DSD owns 20% and VNR 29%. One of the other important projects of HCC in India is the Bandra Worli Sea Link in Mumbai.
This bridge falls under sismic zone – V as per IS: 1893-2002. The superstructure consists of steel trusses of 125m span and 32.6m span, for double track on bottom level and three lane road deck at top level. The warren type truss of 125m span consists of 10 panels of 12.16m each with centre to centre distance of bearing as 121.6m. The members shall consist of welded plates of either ‘I’ or ‘Box’-sections. The Railway deck shall consist of cross girders at a spacing of 12.16m at the bottom chord joints of truss. The stringers and cross girders are of welded type with welded connections for lateral and cross bracing members. The roadway deck consists of composite top chord and cross girders. The roadway cross girders are at the same spacing of 3.04m. Two spans of 32.6m, one each at shores shall be required to be fabricated and launched along with 39 spans of 125m each.