Foundation
Out of 27 foundations, 25 are open wells. The North abutment and pier No.1 are on raft foundations. The wells have been sunk to 56 m below L.W.L, mainly from scour and seismic considerations. The strata encountered were dense sand mixed with pebbles. During sinking, obstructions in the form of wooden logs and boulders were overcome; this was possible with armoured well curb having shoe-brackets and 12 mm thick steel plates.
With elaborate monitoring at each stages of sinking, it has been possible to position all the wells within permissible limits of tilt (1 in 80) and shift (150 mm) each well costing of Rs. 80 lakh and involving 5,000m of concrete was completed within an average period of 90 days.
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