Inner support structure for reinforcing foundation pit support and construction method

Abstract

The invention provides an inner support structure for reinforcing foundation pit support and a construction method. The inner support structure comprises enclosing purlins and a plurality of steel pipe supports, wherein the enclosing purlins are arranged around a foundation pit, both ends of each steel pipe support are respectively a fixed end and a movable end, and the fixed end and the movable end of each steel pipe support are respectively connected with the enclosing purlins on two opposite sides. According to the inner support structure, only plain concrete is poured into the ends of a steel pipe, so that the self weight of the inner support structure is reduced, and the installation difficulty of the inner support structure is reduced. When the inner support structure is removed, theconnecting position is easy to cut, the plain concrete in the steel pipe can be completely taken out, the integrity of the steel pipe is not damaged, the transportation, recycling and use of the steel pipe are facilitated, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of deep foundation pit engineering such as construction engineering, rail transit engineering, and ports and wharfs, and relates to an internal support structure suitable for deep foundation pits, in particular to an internal support structure and construction for strengthening foundation pit support. method. Background technique [0002] In foundation pit engineering, steel pipes or concrete are often used as inner supports to form an enclosure structure to prevent the deformation of the foundation pit. The simple steel pipe support has the problem of insufficient bearing capacity and excessive deformation of the enclosure structure. The use of concrete inner supports will delay the construction period. , Cost increase, difficulty in dismantling in the later stage, inability to recycle and so on. [0003] Using the improved concrete-filled steel tube as support, although the load-carrying capacity has been...

AI Technical Summary

Problems solved by technology

[0002] In foundation pit engineering, steel pipes or concrete are often used as inner supports to form an enclosure structure to prevent the deformation of the foundation pit. The simple steel pipe support has the problem of insufficient bearing capacity and excessive deformation of the enclosure structure. The use of concrete inner supports will delay the construction period. , high cost, difficulty in dismantling later, and inability to recycle, etc.

[0003] Using the improved concrete-filled steel tube as support, although the load-carrying capacity has been improved, due to the increased self-weight of the concrete-filled steel tube, the difficulty of transportation and installation has increased, and the deflection of the support has increased, which has increased the difficulty and requirements of the connection at the interface. At the same time, the concrete-filled steel tube There are also certain difficulties in the final recycling

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