Method for constructing diaphragm wall at existing underground structure: Fid-Bau Portal

Method for constructing diaphragm wall at existing underground structure

WANG JUNYI / CHEN HUA / CHEN XINXI / ZHAO HUI / JIN GUODONG / HUANG PEILIN

The invention relates to a method for constructing a diaphragm wall at an existing underground structure, which comprises the following steps of dismantling an underground structure of a correspondingpart along a length direction of the to-be-constructed diaphragm wall to form a dismantling groove; vertically jacking and reinforcing the rest underground structure on two opposite sides of the dismantling groove; carrying out trenching construction on the dismantling groove to form a construction groove; pouring in the construction groove to form the diaphragm wall; and removing the rest underground structure, and backfilling the removed position. The method firstly removes part of underground structures affecting the diaphragm wall, and the rest diaphragm wall can be used for helping support a foundation pit; meanwhile, the conditions that the surrounding subway pipelines and other structures are affected due to the collapse and disturbance of soil mass caused by removing the diaphragmwall can be avoided. After the diaphragm wall construction, the rest underground is dismantled, the disturbance affection on the surrounding structures by the construction process is reduced, and thesituation that the surrounding pipelines are affected due to disturbance of the soil mass caused by completely dismantling the underground structures can be avoided.

本发明涉及一种在既有地下结构处施工地连墙的方法，包括如下步骤：沿着待施工的地连墙的长度方向拆除对应部分的地下结构形成拆除槽；在拆除槽的相对两侧对剩余的地下结构进行竖向顶撑加固；对拆除槽进行成槽施工，形成施工槽；在施工槽灌注形成地连墙；拆除剩余的地下结构，且对拆除位置进行回填。本发明先拆除影响地连墙的部分地下结构，可利用剩余的地连墙帮助支撑基坑，同时，可防止拆除地连墙引起坍塌扰动土体，影响周围的地铁管线等构筑物。地连墙施工完毕之后，再将剩余的地下结构拆除，减小施工过程对周围结构的扰动影响，避免先将地下结构全部拆除扰动土体影响周围的管线。

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