Deep foundation pit fat groove backfilling system

Abstract

The invention discloses a deep foundation pit fat groove backfilling system which comprises a rubble backfilling layer (4), a reserved pipeline (5), a composite stress backfilling layer and a top concrete backfilling layer (10). A foundation pit supporting system (1) of a deep foundation pit, a foundation pit foundation structure and a structural outer wall (8) form a semi-closed deep foundation pit fertile groove, the two sides of the deep foundation pit fertile groove are closed by the foundation pit supporting system and the structural outer wall, and the bottom of the deep foundation pit fertile groove is closed by the foundation pit foundation structure; the rubble backfill layer, the multiple composite stress backfill layers and the top concrete backfill layer are sequentially backfilled in the deep foundation pit fat groove from bottom to top to form a fat groove backfill structure. The reserved pipeline is vertically arranged in the deep foundation pit fat groove, the lower end of the reserved pipeline extends to the bottom of the rubble backfill layer, the upper end of the reserved pipeline extends to the position above the top concrete backfill layer, and a plurality of holes (51) are formed in the reserved pipeline. The problems that drainage and pressure reduction are difficult, internal stress is uneven and the backfilling effect is unstable in the deep foundation pit fat groove backfilling process can be effectively solved.

Description

technical field [0001] The invention relates to a foundation pit backfill structure, in particular to a deep foundation pit fertilizer groove backfill system. Background technique [0002] The fertilizer trough refers to the part that is excavated more to provide a working surface. Generally, it refers to the space between the outer wall of the basement of the building or the outer wall of the foundation and the edge of the foundation pit. It is one of the important links in the construction of the foundation pit. During the construction of the foundation pit, the fertilizer tank needs to be backfilled. At present, the fertilizer tank of deep foundation pits is mostly backfilled with plain soil or sand and gravel. Due to the abundance of groundwater in the fertilizer tank of deep foundation pits, precipitation on the top and lateral seepage will wash away the backfill material in the fertilizer tank, causing problems such as deformation and subsidence of the backfill materia...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a deep foundation pit fertilizer groove backfill system, which can effectively solve the technical problems of difficult drainage and pressure reduction, uneven internal force, and unstable backfill effect in deep foundation pit fertilizer groove backfill

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