浅谈低净空地下连续墙施工关键技术

摘要:

低净空环境是基坑围护结构施工过程中不可避免的难点之一，该施工问题在高架桥、高压线等基础设施下较为常见。根据南昌丹霞路综合管廊项目对高压线下低净空地下连续墙围护结构施工进行关键技术研究。结果表明，分节吊装过程中，钢筋笼分节组合断面宜设置多个断面；采用抓-铣结合工艺能有效缩短工期；工字钢接头内侧需进行二次处理，避免钢筋笼无法有效下放。

Abstract:

Low clearance environment is one of the inevitable difficulties in the construction of foundation pit retaining structure. This construction problem is common in viaduct, high voltage line and other infrastructure. According to Nanchang Danxia Road comprehensive pipe corridor project, the key technology of underground diaphragm wall envelope construction under high voltage line with low clearance is studied. The results show that in the process of segmental hoisting, the segmental section of reinforcement cage should be equipped with multiple sections. The combined process of grab-milling can effectively shorten the construction period. The inner side of the I-steel joint needs secondary treatment to avoid the failure of the reinforcement cage to lower effectively.