Foundation pit supporting structure and foundation pit construction method: Fid-Bau Portal

Foundation pit supporting structure and foundation pit construction method

LI JIANWANG / WU TIANHUA / NIU JUNTAO / GUO JIANWEI / ZHANG ZHIYAO / YANG LU / SUN HAO / AERMAN SAILIKE / ZHANG XINLEI

The invention provides a foundation pit supporting structure and a foundation pit construction method. The foundation pit supporting structure and the foundation pit construction method are used for a foundation pit close to an existing metro, the foundation pit comprises a standard section foundation pit and an end well foundation pit, the end well foundation pit is an A-area foundation pit close to the existing metro, and the standard section foundation pit is a B-area foundation pit away from the existing metro. The supporting structure comprises at least one blocking wall, a reinforcing structure arranged in any one of at least one sub-foundation pit and a horizontal supporting assembly used for supporting the foundation pit. One of the at least one blocking wall serves as a partition blocking wall to be arranged between the A-area foundation pit and the B-area foundation pit; and the at least one blocking wall divides the A-area foundation pit into the at least one sub-foundation pit. According to the foundation pit supporting structure and the foundation pit construction method, the deformation of an existing subway station or an interval tunnel can be effectively controlled when the deep, long and narrow foundation pit adjacent to the existing subway station or the interval tunnel in a small clear distance is constructed.

本公开提供了一种基坑支护结构及基坑施工方法，用于临近既有地铁的基坑，其中，基坑包括标准段基坑和端头井基坑，端头井基坑为靠近既有地铁的A区基坑，标准段基坑为远离既有地铁的B区基坑。支护结构包括：至少一个封堵墙、设置于至少一个子基坑中任一子基坑内的加固结构，以及用于支撑基坑的水平支撑组件。至少一个封堵墙中的一个封堵墙作为分区封堵墙设置于A区基坑与B区基坑之间；至少一个封堵墙将A区基坑划分为至少一个子基坑。本公开可以在对小净距邻近既有地铁车站或区间隧道的深狭长基坑施工时，有效控制既有地铁车站或区间隧道的变形。

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