基于横跨地铁车站既有轨道交通运营电力线缆原位保护的连续墙施工方法研究

Study on Construction Method of Diaphragm Wall of Foundation Pit of Metro Station Crossing Underneath Operation Power Cable of Existing Rail Transit Based on In-situ Protection

针对城市轨道交通建设中重要管线迁改严重制约地铁车站建设进度的问题,依托苏州轨道交通6号线4标江星路车站基坑下穿既有运营110 kV高压线缆工程,提出采用导墙开挖前临时悬吊管线并设置U型槽钢构保护、划分槽段并用改进后抓斗完成成槽作业、分段制作钢筋笼、钢筋笼平面"双拼"方式入槽后灌注混凝土的一整套施工方法,在对电缆排管原位保护情况下完成地下连续墙施工。施工过程中管线未受明显扰动,地连墙分幅处也未发现有明显渗漏情况。对比管线迁改方案,管线原位保护和配套施工方法可以明显节约施工成本和缩短工期,具有良好的效果。

At present,the important pipeline relocation in urban rail transit construction seriously restricts the construction progress of metro stations.Hence,a series of construction technologies,such as suspending the pipeline before the excavation of guide wall temporarily and setting U-shaped groove steel structure protection,dividing the groove sections and improving the grab to complete the groove forming operation,fabricating the reinforcement cage in sections,and putting the reinforcement cage into the groove by plane"double splicing"method and then pouring the concrete,are put forward for the foundation pit construction of Jiangxing Road Station of No.4 Bid of Suzhou Rail Transit Line 6 crossing underneath the 110 kV high-voltage cable project.The construction of the diaphragm wall is carried out by in-situ protecting the cable pipeline.During the construction process,the pipeline has not been obviously disturbed,and no obvious leakage has been found at the diaphragm wall.The results show that the in-situ pipeline protection scheme with good applicable effect is superior to pipeline relocation scheme in terms of cost and construction schedule.