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Having delivered sophisticated structural bearing and expansion joint solutions to various bridges across the sub-continent for many years already, our team in India has extensive experience in the supply of bearings for impressive railway bridges such as the Chenab Railway Bridge, the New Jubilee Bridge at Kolkata, the Hyderabad Metro’s viaducts and the two-level road and rail bridges over the Ganges River at Munger and Patna – among many others.
But an extra degree of expertise is called for when the task is to replace bearings in an existing structure, considering the need for the new bearings to precisely match the old ones in certain respects, and the complications of working on a bridge that is already in service.
In the case of the recent project to replace the bearings of the main span structures of two railway bridges in western India – on the Zuari and Mandovi rivers – a major challenge was presented by the severely limited track closures during which work could be carried out (maximum 3 hours, sometimes only 1.5 hours). Another significant challenge was the difficult access to the pier tops.
After evaluating the situation in detail, mageba proposed a complete solution involving the design and manufacture of suitably dimensioned and detailed RESTON® POT bearings, the construction of a temporary access platform at each pier to facilitate the installation work, lifting of the bridge superstructures using specially designed low-height hydraulic jacks, and injection of rapid-cure grout beneath the new bearings to ensure proper transfer of load to the substructures.
Executing the work properly, efficiently and safely during the very limited track closures required detailed planning, close coordination with the railway company, and a great deal of engineering competence. Thankfully the work has been completed on both structures without incident, and our colleagues are already applying their expertise to other challenging projects around the country.
Contractor: Afcons Infrastructure Ltd.
Owner: Konkan Railway Corporation