Calculation method of bridge pile steel sleeve construction additional force

Abstract

The invention discloses a calculation method of bridge pile steel sleeve construction additional force, and relates to the technical field of underground engineering. The method comprises the following steps of building a calculation model of steel sleeve construction; calculating the pile end pressure p according to the calculation model; calculating the pile side radial pressure q according to the calculation model; calculating the pile side vertical frictional resistance f according to the calculation model; according to the pile end pressure p, introducing a soil plug height reduction coefficient zeta, and calculating corrected pile end pressure p'; and according to the pile side radial pressure q and the pile side vertical frictional resistance f, introducing four-section correction, and calculating the corrected pile side radial pressure q' and the corrected pile side vertical frictional resistance f'. According to the method, the problem that in the prior art, when the additional force of steel sleeve construction is calculated, the characteristics of steel sleeve sectional construction in actual engineering are neglected, and the influence of the strength of the soil squeezing effect within the steel sleeve construction depth range is ignored, so that the final result and the actual engineering have access to each other is solved.

Description

technical field [0001] The invention relates to the technical field of underground engineering, in particular to a calculation method for the additional force of bridge pile steel casing construction. Background technique [0002] Bored piles have the characteristics of fast construction speed, high bearing capacity, and wide application range, so they are widely used in large-diameter bridge pile projects. However, due to the diversity and complexity of its construction technology, quality control is prone to deviations, and construction and quality accidents of bored piles occur frequently. In particular, the construction of large-diameter bridge piles adjacent to the operating subway tunnel is likely to cause a large disturbance to the surrounding soil, which in turn causes excessive deformation of the tunnel. If effective engineering measures are not taken, the operation safety of the subway will be seriously threatened. The full-casing cast-in-situ pile is constructed ...

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Problems solved by technology

[0007] The purpose of the present invention is to propose a calculation method for the additional force of bridge pile steel casing construction, to solve the problem of ignoring the actual situation when calculating the additional force of steel casing construction in the related art. The characteristics of the segmental construction of the steel casing in the project, and the influence of the strength of the soil extrusion effect within the construction depth of the steel casing, make the final result different from the actual project.

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