Stiff cement-soil mixing support pile inserted into an inverted cup-shaped steel bucket and its construction method

Abstract

The invention discloses an inverted cup-shaped steel drum inserted stiff soil cement stirring retaining pile and a construction method thereof. Soil cement of the stirring pile is arranged in an inserted inverted cup-shaped steel drum, the stress state of the soil cement is changed as the soil cement is sealed in the steel drum, a one-way stretch bending stress state of soil cement on the outer side of H steel in a traditional construction method is changed into a three-way pressing state of the soil cement in the cup-shaped steel drum, and thus the characteristic that the compressive strength of the soil cement is greatly higher than the tensile strength and the shear strength of the soil cement can be brought into full play. According to the stiff soil cement stirring retaining pile disclosed by the invention, the lateral rigidity of a pile formed by a traditional soil mixing wall (SMW) construction method is greatly improved, the defect of small lateral rigidity of the pile formed by the traditional SMW construction method is overcome, the characteristics of high water stop performance, high construction speed, high economical efficiency brought by recyclability of steel and the like in the prior art are inherited, and the retaining pile is suitable for a supporting structure of foundation pit engineering of soft soil, floury soil or silt strata with high excavation depth and high underground water level.

Description

Technical field [0001] The invention relates to a rigid cement-soil mixing support pile inserted into an inverted cup-shaped steel bucket and a construction method thereof, and belongs to the technical field of foundation pit support in geotechnical engineering. It is suitable for the excavation depth and shallow underground water level of the foundation pit engineering enclosure structure, especially under geological conditions such as soft clay and silt with high water content. Background technique [0002] Steel pipes, I-beams, H-beams and other profiles are inserted into cement-soil mixing piles to form rigid cement-soil mixing piles. Generally, this type of pile construction method is called SMW construction method, and this type of pile is also called SMW construction method pile. SMW is the abbreviation of SoilMixingWall. SMW construction method piles came out in Japan in 1976. SMW construction method piles are drilled to a certain depth on site with a multi-axis drilling...

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