Caption : Bangabandhu Jamuna Multipurpose Bridge.
Introduction
Bangabandhu Jamuna Multipurpose Bridge opened in June 1998, is the longest bridge in Bangladesh as well as in South Asia, and the 11th longest bridge in the world. It connects Bhuapur on the Jamuna River's east bank to Sirajganj on its west bank. It is the eleventh longest bridge in the world. It was constructed over the Jamuna River.
History of construction
Popular leader Maulana Abdul Hamid Khan Bhashani first raised the demand for construction of the Jamuna Bridge at a political level in 1949. In the 1954 provincial elections of East Pakistan, the 21-point manifesto of the united front contained a demand for the bridge. On January 6, 1964, Mohammad Saifur Rahman, a member from Rangpur in the Provincial Assembly inquired about government's intentions with regard to the construction of a bridge over the Jamuna. On July 11, 1966, Shamsul Haque, another member from Rangpur in the same Assembly, moved a resolution for the construction of the bridge and the house adopted it unanimously.
After Bangladesh attained independence in 1971, the new government publicly stated its intention in 1972 to construct a bridge over the Jamuna and budgetary provisions were kept for the purpose in the 1972-73 budget. On being invited by the Bangladesh government, the Japan International Cooperation Agency (JICA) funded a feasibility study through Nippon Koei Co. Ltd. in 1973 on the construction of a road-cum-rail bridge over the Jamuna.
Jamuna Multipurpose Bridge was constructed at a cost of $962 million. The cost of construction was shared by IDA, ADB, OECF of Japan, and the government of Bangladesh. Of the total, IDA, ADB and OECF supplied 22% each, and the remaining 34% was borne by Bangladesh. The components of the project's cost were as per given pie chart:
The main bridge is 4.8 km long with 47 main spans of approximately 100 metres and 2 end spans of approximately 65 metres. Connected to the bridge are East and West approach viaducts each with 12 spans of 10 metre length and transition spans of 8 metres. The total width of the bridge deck is 18.5 metres.
The crossing has been designed to carry a dual two-lane carriageway, a dual gauge (broad and metre) railway, a high voltage (230 kV) electrical interconnector, telecommunication cables and a 750 mm diameter high pressure natural gas pipeline. The carriageways are 6.315 metres wide separated by a 0.57 metre width central barrier; the rail track is located along the north side of the deck. On the main bridge, electrical interconnector pylons are positioned on brackets cantilevered from the north side of the deck. Telecommunication ducts run through the box girder deck and the gas pipeline is located under the south cantilever of the box section. The bridge has been built by Hyundai Engineering and Construction (Korea) as a 'design and build' contract. TY Lin Assoc. of San Francisco carried out the design as a sub-contractor for Hyundai. The approach roads were constructed by Samwhan Corporation (Korea).
Considering the fact that the width of the main channel does not exceed 3.5 km, and after making allowances for floods, a bridge length of 5 km was considered adequate. In October 1995, one year after the commencement of physical work of the bridge, a bridge length of 4.8 km, instead of a flood-width of the river at 14 km, was finalised. This narrowing was essential to keep the overall project cost within economic viability. It has, however, required considerable river training work to keep the river under the bridge.
To withstand predicted scourge and possible earthquakes, the bridge is supported on 80-85 m long and 2.5 m and 3.15 m diameter steel piles, which were driven by powerful (240-ton) hydraulic hammer. The superstructure of the bridge is pre-cast segments erected by the balanced cantilever method. Basic features of the bridge are: length (main part) - 4.8 km; width - 18.5 metre; spans - 49; deck segments - 1263; piles - 121; piers - 50; road lanes - 4; railway tracks - 1 dual gauge track.
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