Inaugurated by Prime Minister Sheikh Hasina, this $160 million project for the Dhaka City Corporation is designed to help modernise the city and contribute to attracting investment.
The flyover is one the largest projects to date under the Bangladesh government’s public/ private partnership programme, intended to improve water, electricity, and gas supplies, as well as ease traffic congestion in the southern part of Dhaka.
The four-lane dual-carriageway flyover runs 9 kilometres and includes 13 slip roads stretching from the Dhaka-Chittagong highway to Palashi. This structure is expected to provide faster road connectivity with 30 districts. It is thus strategic to the development of the country’s capital.
THE CLIENT:
Dhaka City Corporation
THE CHALLENGE
Some of the difficulties included legal wrangling between various divisions of government, design revisions, and complaints of incompatibility with a planned metro rail. To maintain construction on schedule, the army was called in to help relocate utility lines from the project area.
South Asia is a very challenging business environment so this was achieved by:
Thorough and effective planning with strong input from local specialists and other parties allowed for contingencies.
Additional site supervision and detailed monitoring of logistics and supply planning.
Extensive liaison effort, especially with government departments and relevant parties, so that everyone was kept informed of changes or revisions, with a clear directive of what was expected of them in response.
The foundation stone for construction of Jatrabari-Gulistan flyover, the first such project to be built through private investment without involving any government fund or foreign loan support, was laid in June 2006. Dubai-based Belhasa-Accom and Associates Ltd will construct the flyover under the supervision of the DCC.
The structures are mainly on specially designed pile/open foundation and pre-stressed concrete superstructure. The total length of the elevated corridor is 11.8 Km of which approx. 4.1 Km is main flyover having 4-lane divided carriageway and approx. 6.1 Km is ramps having 2-lane carriageway.
Piles with 800~1200mm diameter were used for the foundation where the lengths varied from 25~38 meter. Both segmental box girders were with post-tensioned and I-girders with pre-tensioned were used for the super structure.
Moreover, 26 units of cast in-situ spans are also included in the ramps. .
It was a great challenge to finalize the details of pile group and its cap for the foundation of entire flyover by keeping most of the major different utilities in its own position without relocating the same.
As a result, separate design for all the 315 numbers of pile group of different regular and irregular shapes comprising of total 2366 numbers of pile shaft was done for the entire flyover.
The LRFD method of AASHTO 4th Edition 2007 was adopted for the design of pile foundation of the flyover. Hydraulic Drilling Rig was used for pile boring and plant made ready mix concrete (RMC) through "Tremie" was used to do the pile concreting.
A total of 2,000 workers and 120 engineers worked for 26,000 hours to build the flyover with 32,000 tonnes of steel, 89,000 tonnes of cement and 1,66,000 tonnes of stone.
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