Post-grouting reinforcement construction method for flexible joints of ground-connected walls

Abstract

The post-grouting reinforcement construction method of the flexible joint of the ground connection wall is the construction technology of the ground connection wall of the subway foundation pit engineering. Grouting pipe (2): Place the porous grouting pipe at the end of the reinforcement cage, and tie it together with the reinforcement cage with iron wire, or weld it on the reinforcement cage with electric welding, and lower it together with the reinforcement cage; there are three porous grouting pipes, They are respectively installed at the ends of steel cages of two underground diaphragm walls, one grouting pipe is installed on both sides of the end of one underground diaphragm wall, and one grouting pipe is arranged in the middle of the end of the other underground diaphragm wall; when the underground diaphragm wall The concrete of the wall reaches more than 70% of the design strength. Before final setting, a high-pressure pump is used to inject reinforcing cement slurry into the wall through a porous grouting pipe. The invention has good grouting effect and high grouting success rate, can effectively improve the integrity of the ground connection wall and reduce the leakage problem of the flexible joint of the ground connection wall.

Description

technical field [0001] The invention belongs to the reinforcement technology of the flexible joint of the ground connection wall in the support structure of the deep foundation pit of the underground engineering. It is suitable for large-scale deep foundation pit projects in soft soil areas where the groundwater level is buried shallow and the ground connection wall is deeply embedded, especially in silty silt soil geological conditions. Background technique [0002] The construction joint of the underground diaphragm wall is the joint that longitudinally connects the units of two adjacent trough sections. It should meet the requirements of stress and anti-seepage (ensure the impermeability and integrity of the wall), and strive for simple construction. For the next unit trough The grooving of the segments poses no difficulties. There are many types of joints, such as direct connection to form joints and lock pipe joints, joint box joints and prefabricated component joints....

AI Technical Summary

Problems solved by technology

[0003] Technical problem: The purpose of the present invention is to provide a method for strengthening the flexible joint of ground wall with good grouting effect and high success rate of grouting, so as to make up for the low joint strength of the traditional flexible joint of ground wall caused by process defects , Poor penetration resistance and other shortcomings

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