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Case Study
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CLIENT : Hooghly River Bridge Commissioners ![]() ELEVATION ![]() DECK SECTION ![]() HALF PLAN Salient features of the bridge Type:Cable stayed girder bridge with composite construction. Span arrangement:One main span of 457.2m with 2 end spans of 182.88m each Gradient:1 in 25 Carriage way:2 nos., 3 lane carriageway (12.30m) divided by a median strip 1.70m wide. Deck Structure:R C composite deck with built up steel girders. The girder system comprises of two longitudinal l Section plate girders 29.10m apart with a middle longitudinal girder and connecting cross girders at 4.10m c/c. The R.C composite slab (max.. thickness 230mm) spans between the girders. Cables:Parallel wire cables, formed with 7mm dia wires(U.T.S. 160 kg/sq.mm) and forged steel anchorages with Hi Ammass at the ends are connected to the tower head at one end and to the main girders at the other. Definition of work:All over the world the major problem faced by stayed cable bridges is premature distress of cable wires due to corrosion. To overcome this problem CICO entered into a technical collaboration with Yokohama Rubber Company, Kapan and Toshin Kaken, Japan for protection of the main cables against corrosion. The material used had to be flexible as the rigid material would result in cracking which would lead to corrosion. The material used had to be fire retardant as well. The material thus used was a combination of Polyurethane and Polyutadiene. Work Value:Approx. Rs. 160 million. |
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