A 180-metre, four-span river crossing replacing a seasonal causeway that closed the corridor for up to eleven weeks each monsoon. Substructure was built inside a single low-flow window using staged cofferdams.
The river-bed working window was limited to a 5-month low-flow period; missing it would have added a full year to the programme.
Sub-soil investigation showed a boulder layer at variable depth, making sinking rates unpredictable across the four foundations.
The existing causeway had to remain open to local traffic throughout construction.
Foundation sequence was re-planned to sink two wells concurrently with independent cofferdams, doubling the effective use of the low-flow window.
A chiselling and grabbing method with pre-positioned standby plant kept sinking progress through the boulder layer without stopping the sequence.
Girder casting moved to an off-site bed on the true left bank, decoupling superstructure production from river conditions.
The causeway was retained as a controlled single-lane crossing with scheduled closure windows published to the community two weeks in advance.
Span length
180 m
Four prestressed girder spans
Completed
Ahead of programme
Handover 6 weeks early
Corridor closure
Eliminated
Previously up to 11 weeks a year
Lost-time injuries
0
Over 26 months
The seasonal causeway before construction, and the completed crossing providing year-round access.
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