Construction method of three-dimensional rigid foundation pit supporting structure

Abstract

The invention discloses a construction method of a three-dimensional rigid foundation pit supporting structure. The three-dimensional rigid foundation pit supporting structure comprises a front row ofwall protection piles and a back row of vertical pre-stressed anchor rods. The front row of wall protection piles is arranged on the wall of a foundation pit. The back row of vertical pre-stressed anchor rods and the front row of wall protection piles are distributed longitudinally in parallel. The top of the front row of wall protection piles is connected with a front row of wall protection pilecrown beam. The upper portion of the back row of vertical pre-stressed anchor rods is connected with a back row of vertical anchor longitudinal beam. A cantilever beam is connected between the frontrow of wall protection pile crown beam and the back row of vertical anchor longitudinal beam. The front row of wall protection pile crown beam, the back row of vertical anchor longitudinal beam and the cantilever beam are poured into a whole. The stability performance and antidumping capacity of a supporting system are increased; lateral deformation of the pit wall can be controlled; and the anchor group effect can be avoided. The construction method is suitable for special environments such as subway tunnels or subway junction stations or underground pipe galleries adjacent to the foundationpit, and is short in construction period, low in manufacturing cost and small in number of consumables, construction is convenient, the problems that in a traditional dual-row pile structure, the costis high and the construction period is long are solved, and good social benefits and economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of foundation pit support, and in particular relates to a construction method of a three-dimensional rigid foundation pit support structure, which is mainly applicable to the situation that the adjacent buildings (structures) of the foundation pit cannot be constructed. Background technique [0002] With the rapid development of my country's infrastructure construction, a large number of public buildings (structures) such as underground railways and pipe galleries have been built in cities. Since the proposed building is adjacent to the subway tunnel, subway hub station or underground pipe gallery, traditional support structures such as soil nails and anchor rods cannot be properly implemented during foundation pit construction, and only internal support or double-row pile support structures can be used. . [0003] However, the internal support and double-row pile support structure have great limitations in...

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Problems solved by technology

[0004] The invention provides a construction method of a three-dimensional rigid foundation pit support structure to solve the technical problems of difficult construction, high cost, long construction period and complicated procedures when there are adjacent buildings (structures) in the foundation pit.

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