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某线铁路某段处于30m左右深路堑,其上有3×40m预应力混凝土简支转连续T梁公路上跨桥,因路堑地质为膨胀岩,单侧膨胀岩边坡滑移推动桥台移动,导致全桥纵向移动,墩台开裂,不能保证公路上跨桥正常使用,需加固处理。通过多方案比较后,确定加固设计方案采用基础托换、桥墩抱箍及桥台新建、通过顶升及落梁利用既有T梁等措施对既有桥进行加固,桥梁加固后满足各项规范要求,达到了预期效果。
A section of a railway line is at a depth of about 30m, and there are 3 × 40m prestressed concrete simply supported continuous-turn T-beam bridges across the bridge. Because the cutting geology is swelling rock and the unilateral expansion rock slope slides to promote the abutment movement , Resulting in longitudinal movement of the bridge, pier cracking, can not guarantee the normal use of the bridge across the road, to be reinforced. Through the comparison of multiple schemes, it is determined that the reinforcement design scheme adopts the foundation underpinning, the bridge pier hoop and the bridge abutment to be newly built, and the existing bridges are reinforced by using existing T-beams through jacking and falling beams, and the bridges are reinforced to meet the specifications Requirements, to achieve the desired results.