Construction method for overlength jet grouting stiffness core combined pile

Abstract

The invention discloses a construction method for an overlength jet grouting stiffness core combined pile. The construction method includes following steps: (1) determining the vertical and horizontal distribution conditions of high-pressure-bearing water sections and non-high-pressure-bearing water sections according to the geological condition, and determining the quantity and the diameter of jet grouting pile expansion sections in pile bodies of overlength jet grouting piles; (2) performing construction of a plurality of groups of overlength jet grouting piles by employing high-pressure jet grouting drills, and setting the spacing between the plurality of overlength jet grouting piles according to the diameter of the jet grouting pile expansion sections; (3) manufacturing components of pile connectors, assembling and connecting wing plates of I-steels of various unit lengths by employing wing plate connection bolts and wing plate connection boards in the transverse direction, and forming section steel piles in unit lengths; (4) inserting the section steel piles, assembling the section steel piles of various unit lengths via web connection bolts and web connection boards according to the design length of the section steel piles, and accomplishing the construction work of the overlength jet grouting stiffness core combined pile via assembling and inserting; and (5) accomplishing the construction of the jet grouting pile expansion sections and the overlength jet grouting piles.

Description

technical field [0001] The invention relates to a construction method of a rigid-flexible composite pile, in particular to a construction method suitable for a plurality of ultra-long rotary grouting piles and a section steel pile composite pile in a highly confined water foundation. Background technique [0002] The high-pressure jet grouting method is a new technology developed by introducing high-pressure water flow technology based on the theory and practice of static pressure grouting. It is mainly used to strengthen the foundation and improve the shear strength of the foundation. It is often used for foundation anti-seepage, Improve the water flow properties of the foundation soil and stabilize the slope and other projects. According to different injection methods, it can be divided into single-pipe method, double-pipe method and triple-pipe method. The high-pressure rotary jet grouting method has the advantages of wide application range, convenient construction, and ...

AI Technical Summary

Problems solved by technology

However, for some projects, due to the high pressure of water or the deep depth of high-pressure jet grouting piles, the groundwater pressure is relatively high, and it is difficult for ordinary grouting equipment to inject lower-pressure grout into the surrounding soil, so the design diameter cannot be formed. pile body

[0003] However, in the highly confined water foundation, the strength of the pile body needs to meet certain requirements. Although the pure flexible pile can be applied to the highly confined water foundation, its strength is relatively weak. The traditional rigid-flexible pile uses a soft One rigid combination mode, in deep foundation pit support, the connection between such combination piles is weak, which is easy to cause high pressure water leakage, soil gushing at the bottom of the foundation pit, etc.

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