Rehabilitation of PSC Bridge - A Case Study
Introduction
A grade-separator was to be constructed at the Polytechnic crossing in Lucknow city on National Highway-24A. The construction work was started in May 2002 which was scheduled to be completed within three years. Before the completion of the work, the contract was terminated and the leftover work was awarded to another contractor. Two spans of Inner carriageway and one span of Outer carriageway were completed by the previous Contractor. The soffit slab and the web portion of the Outer span P2-P3 was cast-in-situ by the previous contractor while, the deck was to be cast by the new contractor. As the box girder was designed for single stage prestressing (i.e. Prestressing only after the casting of soffit slab, web and deck slab), therefore this span could not be prestressed earlier and remained supported on the shuttering for about two years. As soon as the work of prestressing was started, end anchorage blocks started caving, one after another. The work was immediately stopped and the problem was referred to CRRI. CRRI conducted detailed inspections/investigations for the structural integrity of this span P2-P3 on outer carriageway. Based on test results and visual inspection, scheme of its rehabilitation was prepared. Post rehabilitation assessment of the bridge was also carried out by CRRI and results are presented in this paper.
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Published on:
17 December 2012
Published in: NBM&CW December 2012
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