在南水北调中线某跨渠排水渡槽施工中，由于柱墩阻水情况不满足设计要求，需对下部结构进行改造，以减少阻水影响。介绍了将该渡槽柱墩改造为板式墩的设计和施工方案，及下部结构的受力分析过程。改造中，在不中断已建渡槽使用的前提下，完成原有盖梁受力体系的转换和板墩置换，同时对盖梁进行了截面增大的改造。对类似工期紧张、空间受限的下部结构改造工程具有借鉴意义。%Substructure of a drainage aqueduct crossing main canal of South-to-North Water Diversion Project was needed to be reconstructed due to excessive water-resistance effect, the restructuring design solution that substitutes plate-piers for col-umn-piers as well as the construction scheme are presented. In the construction, the plate-piers were substituted and the sec-tion of bent cap was enlarged, so the former force system was transferred while the aqueduct functioned well. The force analysis for the restructuring process is carried out, which provides valuable references for other substructure restructuring construction characterized as limited construction schedule and restrained construction clearance.
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