Variable section cement-soil gravity type retaining wall and construction method thereof

Abstract

The invention discloses a variable section cement-soil gravity type retaining wall and a construction method thereof. The retaining wall comprises a main wall body which consists of main cement mixed pile bodies, and an attached wall body which is positioned below the bottom face of a foundation pit and on one side or two sides of the main wall body, is connected with the main wall body and consists of attached cement mixed pile bodies, wherein the main wall body and the attached wall body form the variable section retaining wall. The construction method comprises the following steps of: forming the main wall body by using a cement mixed pile machine, forming the attached wall body, and excavating empty pile parts, so that the variable section cement-soil gravity type retaining wall is formed by the main wall body which consists of the main cement mixed pile bodies and is positioned above the bottom of the foundation pit, and the main wall body consisting of the main cement mixed pile bodies and the attached wall body consisting of the attached cement mixed pile bodies, which are positioned below the bottom of the foundation pit. By using the retaining wall formed by the construction method, when the soil layer at the bottom of the foundation pit is disturbed by cushion cap excavation and substrate structure construction, the foundation pit deforms a little, and the formed gravity type retaining wall has small width and floor area and high inclination resistance, shear resistance and bending resistance.

Description

technical field [0001] The invention relates to a cement-soil gravity retaining wall structure and a construction method for temporary support of foundation pit excavation, in particular to a variable-section cement-soil gravity retaining wall and a construction method thereof. Background technique [0002] The cement-soil mixing pile is a kind of soil reinforcement formed by uniformly mixing the undisturbed soil and cement. Using special mixing machinery such as deep mixer or high-pressure rotary spraying machine, the undisturbed soil and curing agent are forced to stir in the foundation soil on the spot, and a series of complex physical and chemical reactions are produced through the soil and curing agent or external admixture to form a Mixing piles with certain strength, integrity and stability, and multiple cement-soil mixing piles form a retaining wall. In construction, some foundation pits need to be excavated, but in actual construction, in order to prevent the stabi...

AI Technical Summary

Problems solved by technology

The currently known cement-soil gravity retaining walls used for excavation and support of foundation pits are all in the form of equal cross-sections. The disadvantages are that the wall width is too large and the floor area is large. When the bottom of the foundation pit is located in soft soil such as silt or silty soil, the excavation of the cap and the construction of the floor structure will disturb the bottom soil layer of the foundation pit, resulting in an increase in the actual excavation of the foundation pit, thereby increasing the deformation of the foundation pit , affecting the safety of the foundation pit support structure and the pile foundation in the foundation pit

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