Construction method of cast-in-situ stiff piles for foundation pit supporting

Abstract

The invention discloses a construction method of cast-in-situ stiff piles for foundation pit supporting. The method comprises the following construction steps: paying off and locating; after a construction platform is laid, drilling pile holes by a spiral drilling machine, wherein the pile holes have the apertures of 350mm, and when the pile holes are drilled, the maximum drilling amount of every time is less than or equal to 500mm, the deviation between the center of a drill bit and each pile position is less than or equal to 5cm, and the pile verticality deviation is less than or equal to 0.5%. After the construction method is adopted, the utilization rate of a reinforcing steel bar of a pile body is improved, the construction technology is simplified, the cost is lowered, and the time limit for a project is shortened.

Description

technical field [0001] The invention relates to the field of building foundation pit support, and is especially suitable for the construction method of rigid piles for foundation pit support in a pile-anchor support system. Background technique [0002] With the improvement of the development and utilization of urban space, the site conditions of deep foundation pit support projects are becoming more and more harsh, especially in the case of small foundation pit sites and tight construction schedules, large-diameter cast-in-place piles and rotary excavation piles are subject to The limitation of strata and mechanical operation space is difficult to meet the construction requirements; the main bending moment of the support pile does not match the force characteristics of the traditional form of uniformly distributed reinforcement, resulting in low steel utilization. Contents of the invention [0003] The purpose of the present invention is to provide a construction method o...

AI Technical Summary

Problems solved by technology

[0002] With the improvement of the development and utilization of urban space, the site conditions of deep foundation pit support projects are becoming more and more harsh, especially in the case of small foundation pit sites and tight construction schedules, large-diameter cast-in-place piles and rotary excavation piles are subject to The limitation of stratum and mechanical operation space is difficult to meet the construction requirements; the main bending moment of the support pile does not match the force characteristics of the traditional uniform reinforcement form, resulting in low utilization rate of steel

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