Construction method of cement-soil mixing pile with strong core

Abstract

The invention discloses a stiffening-core cement mixing pile construction method. The construction method comprises the following steps of: step (1) installing a guide frame; step (2) constructing a cement mixing pile; step (3) inserting Larson steel plates and Steel pipes, namely (C1) pretreating the Larson steel plates and the Steel pipes, and coating the surfaces of the Larson steel plates andthe Steel pipes with a friction reducing agent of which the thickness is controlled to be 1-3 mm; and (C2) welding the pretreated Larson steel plates and Steel pipes as a whole, wherein each steel pipe is positioned between two Larson steel plates and is positioned at the middle part of a concave surface of the corresponding Larson steel plate; the lower end of each steel pipe extends out of the corresponding Larson steel plate; and the upper end of each steel pipe is aligned to the corresponding Larson steel plate. The construction method disclosed by the invention improves the bending resistance and the shearing resistance of support, and the overall support has good stability.

Description

technical field [0001] The invention relates to the field of foundation pit support construction. More specifically, the invention relates to a construction method of a cement-soil mixing pile with a strong core. Background technique [0002] With the development of urban underground space, the construction of deep foundation pits has become more and more common. In the process of excavating deep foundation pits, the support of foundation pits is particularly important. Deep mixing piles and Larsen steel sheet piles, as two common types of foundation pit enclosure, have their own advantages and disadvantages. For example, the gravity retaining wall of conventional deep mixing piles has poor bending resistance, shear resistance, overturning resistance and slip resistance, and it is easy to be damaged under the action of earth pressure, which affects the safety of the foundation pit and surrounding buildings. However, the Larsen steel sheet piles are overlapped with each ot...

AI Technical Summary

Problems solved by technology

For example, the gravity retaining wall of conventional deep mixing piles has poor resistance to bending, shearing, overturning and sliding, and is easily damaged under the action of earth pressure, which affects the safety of foundation pits and surrounding buildings.

However, the Larsen steel sheet piles are overlapped with each other to form a foundation pit support structure. The support depth is limited, and gaps are prone to appear, and the water-stop effect is not good.

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