Construction method for adopting concrete breast board piles to support side slope with height difference of foundation pit

Abstract

The invention relates to a construction method for adopting concrete breast board piles to support a side slope with height difference of a foundation pit. The construction method includes: step 1, the concrete breast board piles are manufactured, anchor bars are embedded at the tops of the breast board piles, female grooves is arranged on one sides of the breast board piles, and seam allowances matched with the female grooves are arranged on the other sides of the breast board piles; step 2, a shallow foundation pit is excavated; step 3, a plurality of breast board piles are hung in supporting positions, the seam allowances on the breast board piles are inserted in the female grooves of the adjacent breast board piles, and the plurality of breast board piles forms a whole body and are fixed; step 4, cement mortar or fine stone concrete is poured in the female grooves; step 5, the anchor bars are welded onto a main reinforcement of a bottom plate in a foundation of the shallow foundation pit, the lower portions of the breast board piles are embedded in a soil layer, and the upper portions of the breast board piles, the lower portion of the foundation of the shallow foundation pit and the soil layer form into a whole body; and step 6, a deep foundation pit is excavated. The construction method is simple to construct and high in safety and has good comprehensive technical and economic benefits.

Description

technical field [0001] The invention relates to the field of foundation pit height difference slope support construction, and more specifically relates to a construction method for foundation pit height difference slopes supported by concrete retaining sheet piles. Background technique [0002] In the blast furnace project, the main body foundation is usually constructed first, and then the deep foundation of the pipe gallery in the casting yard is constructed. Because the bottom elevation of the blast furnace body foundation is -4.2m, the bottom elevation of the pipe gallery foundation is -7.5m, and the net distance outside the foundation is only 1.3m , the base height difference is large, in order to ensure the safety of buildings and foundation pit slopes, the usual practice is to pre-drive steel rails, I-beams or H-beams at the retaining position between the pipe gallery and the foundation of the blast furnace body, with a spacing of 1.2~ 1.5m, and then excavate the soil...

AI Technical Summary

Problems solved by technology

[0002] In the blast furnace project, the main body foundation is usually constructed first, and then the deep foundation of the pipe gallery in the casting yard is constructed. Because the bottom elevation of the blast furnace body foundation is -4.2m, the bottom elevation of the pipe gallery foundation is -7.5m, and the net distance outside the foundation is only 1.3m , the base height difference is large, in order to ensure the safety of buildings and foundation pit slopes, the usual practice is to pre-drive steel rails, I-beams or H-beams at the retaining position between the pipe gallery and the foundation of the blast furnace body, with a spacing of 1.2~ 1.5m, and then excavate the soil, insert a 3-6cm thick retaining plate between the steel piles to retain the soil, drive a wedge between the transverse retaining plate and the steel, so that the horizontal plate is in close contact with the soil, but due to Horizontal slabs cannot stop water, especially when the groundwater level is high, the soil is sandy, and the construction is difficult due to precipitation. Often, due to water and soil loss in the upper part of the foundation pit, the soil in the foundation of the building will be elevated, causing soil collapse and superstructure damage. Or uneven settlement, etc., can easily lead to safety and quality hazards such as subsidence of the surrounding foundations. It is necessary to repeatedly reinforce the support, which is costly, takes a long time to construct, and cannot ensure safety.

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