Method for calculating settlement of composite single pile of post-grouting cast-in-place pile of extruded and expanded branch disc

Abstract

The invention discloses a method for calculating settlement of a composite single pile of a post-grouting cast-in-place pile of an extruded and expanded branch discextruding and expanding branch disc.The invention, belongings to the technical field of building pile foundations. The invention provides a method for calculating settlement of a composite single pile of a post-grouting cast-in-place pile of an extruding and expanding branch disc. The adopted scheme is as follows: the method comprises the steps of 1. Tthe grouting cast-in-place pile is a single pile after the branch disc is extruded and expanded; or the piles are single-row piles, or the center distance of the sparse pile foundation is greater than 6 times of the pile diameter; pile foundation settlement calculation of the cast-in-place pile considers the influence of load sharing of foundation soil at the bottom of a bearing platform on pile foundation settlement. The settlement of the grouting pile composite single pile behind the squeezed branch disc is calculated as follows: the settlement is calculated as follows; superposing additional stress generated by calculation points of bearing platform bottom foundation counterforce and post-grouting cast-in-place pile side resistance and end resistance on a pile body axis below a pile end plane, calculating the settlement of a pile foundation by adopting a one-way compression layering summation method, and counting the pile body compression amount of a section part from a pile top to an upper disc top; the method is suitable for the field of settlement calculationof building pile foundations.

Description

technical field [0001] The invention relates to a method for calculating the settlement of a composite single pile of a grouted cast-in-place pile after extrusion and expansion of a support plate, and belongs to the technical field of building pile foundations. Background technique [0002] Pile foundation is one of the important forms of building foundation. For high-rise buildings and bridges, most of them use pile foundation. In the late 1950s, India began to use multi-section reaming piles in expansive soil. In early 1978, the Beijing Institute of Construction Engineering conducted a 300mm small-diameter pile with a diameter of 480m at the enlarged head and two sections with a length of 5m. Three-section reaming short piles were tested and studied. Then around 2000, the application promotion and mechanism research of extruded and expanded branch piles were carried out in many places in China. Concrete cast-in-situ piles with extruded support discs use special extruded ...

AI Technical Summary

Problems solved by technology

At present, there is still no conclusion on the settlement calculation of the grouted cast-in-place pile after the extruded and expanded support plate when it bears the vertical load

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