Counter-pressure system for restraining horizontal displacement of foundation pit enclosure structure and construction method thereof

Abstract

The invention provides a counter-pressure system for restraining horizontal displacement of a foundation pit enclosure structure and a construction method thereof, and relates to the field of foundation pit construction in geotechnical engineering. The construction method comprises the steps that a steel bracket, a PVC reinforced water bag and a limiting block are arranged; the steel bracket is arranged at the bottom of a foundation pit; the outer side edge of a cross beam of the bottom of the steel bracket is limited by a positioning block to realize the limiting of the outer side of the steel bracket in the horizontal direction; a stand column of the steel bracket corresponds to the outer side interval of the enclosure structure; the PVC reinforced water bag is arranged between the standcolumn and the enclosure structure; and the lower end of the PVC reinforced water bag is arranged on the inner side edge of the cross beam. In the practical use process, the occupied area is small, the stability is high, the counter-pressure height is large, the counter-pressure load is large, the construction is simple, convenient and fast, the counter-pressure system is economical and practical, an application range is wide, and the counter-pressure system is suitable for being widely popularized.

Description

technical field [0001] The invention relates to the field of foundation pit construction in geotechnical engineering, in particular to a back pressure system and a construction method for constraining the horizontal displacement of foundation pit enclosure structures. Background technique [0002] When the excavation area of ​​the foundation pit is large, a large-area horizontal support system needs to be installed, and more vertical support piles and support columns need to be installed at the same time, which affects the construction period and cost. At present, when the excavation area of ​​the foundation pit is large, the scheme of reserving backpressure soil in the surrounding enclosure structure of the foundation pit is gradually adopted. Reserving back pressure soil is an excavation method in which the middle part of the foundation pit is excavated first, and then the earthwork around the retaining wall is excavated. The amount of support is small and the cost is low....

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Problems solved by technology

[0003] However, the reserved soil needs to occupy a certain space, and there may not be enough space to implement the reserved soil back pressure in a restricted environment

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