Construction method of a three-dimensional rigid foundation pit support structure

Abstract

The invention discloses a construction method for a three-dimensional rigid foundation pit support structure. The three-dimensional rigid foundation pit support structure includes a front row of retaining piles and a rear row of vertical prestressed anchor rods, and the front row of retaining piles is arranged at the wall of the foundation pit , the rear row of vertical prestressed anchors are distributed parallel to the front row of retaining piles longitudinally, the top of the front row of retaining piles is connected with the front row of retaining pile crown beams, and the upper part of the rear row of vertical prestressed anchors is connected with the rear row of vertical anchor longitudinal beams, A cantilever beam is connected between the front row of retaining pile crown beams and the rear row of vertical anchor longitudinal beams, and the front row of wall retaining pile crown beams, the rear row of vertical anchor longitudinal beams and the cantilever beams are poured as a whole. The invention increases the stability performance and anti-overturning ability of the support system; can control the lateral deformation of the pit wall; and can prevent group anchor effect. It is suitable for special environments such as foundation pits adjacent to subway tunnels, subway hub stations or underground pipe galleries. It has short construction period, low cost, less consumables, and convenient construction. It solves the problems of high cost and long construction period in the traditional double-row pile structure. Good social and economic benefits.

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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