A construction method for improving the bearing capacity of inclined steel pipe piles

Abstract

The invention discloses a construction method for improving the bearing capacity of oblique steel pipe piles, which includes the following steps: (1) inserting oblique steel pipe piles obliquely into the soil layer to a predetermined depth by using a sinking machine, Including the steel pipe pile body, the lower end of the steel pipe pile body is provided with a variable diameter pipe section and a guide pipe in sequence; (2) Extend the high-pressure rotary spraying drill pipe on the drilling rig into the steel pipe pile body, and Drilling under guidance to the design top elevation position of the rotary grouting reinforcement section to be constructed in the soil layer; (3) After drilling to the design top elevation position, the high-pressure rotary grouting drill pipe is drilled while high-pressure rotary jet cement slurry is formed to form a section (4) Lift the high-pressure rotary grouting drill pipe away from the oblique steel pipe pile, and then sink the oblique steel pipe pile to the depth range of the rotary grouting reinforcement section, so that the oblique steel pipe pile and the rotary grouting reinforcement section The spray reinforcement section forms a coaxial integrated structure. The invention has the advantages of simple and fast construction method, high reliability and low construction cost.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a construction method for improving the bearing capacity of inclined steel pipe piles. Background technique [0002] The construction method of oblique steel pipe piles is usually to carry out a certain length of high-pressure rotary jet reinforcement in a certain area at the end of the steel pipe pile, and then insert the steel pipe pile into the reinforcement body, and finally ensure that the steel pipe and the pile end reinforcement body are jointly stressed. However, due to the high flexibility of the high-pressure rotary grouting drill pipe, it is difficult to ensure the line shape of the drill pipe during oblique drilling (from oblique line to deflection line), and the reinforcement area is prone to deviation, which leads to the failure of subsequent steel pipe piles. It can be effectively inserted into the high-pressure rotary grouting reinforcement a...

AI Technical Summary

Problems solved by technology

However, there are certain problems in the construction process, which can easily affect the bearing capacity of the pile foundation.

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