Water seepage prevention construction method at the joint surface of underground diaphragm wall by open-cut method and cover-excavation method

Abstract

The invention provides an anti-seepage construction method of a joint surface between an underground continuous wall of an open-cut method and an underground continuous wall of a cover-excavation method. The method comprises the following steps: forming a deformation joint in the joint surface between the underground continuous wall of the open-cut method and the underground continuous wall of the cover-excavation method to release uneven inner force of the underground continuous walls on the two sides, and tightly pressing an anti-seepage shear block onto the external side of the joint surface between the underground continuous wall of the open-cut method and the underground continuous wall of the cover-excavation method by using the dislocation force generated by deformation differences of the two sides of the underground continuous wall so as to take an anti-seepage effect. The anti-seepage construction method of the joint surface between the underground continuous wall of the open-cut method and the underground continuous wall of the cover-excavation method, provided by the invention, is suitable for situations that difference exists between the deformations of the joint surface between the underground continuous walls, has the advantages that the shearing force generated by relative dislocation of the underground continuous walls is fully utilized, the deformations of the underground continuous walls are limited and the anti-seepage effect is also taken, and also has the advantages of relatively high efficiency, less used materials, lower cost, convenient construction and operation and high reliability.

Description

technical field [0001] The invention relates to a method in the technical field of underground building construction, in particular to an anti-seepage construction method at the joint surface of an underground continuous wall by an open-cut method and a cover-excavation method. Background technique [0002] Among the subway construction methods, the open-cut method has simple construction technology, high construction efficiency, and low engineering cost, but it has a greater impact on the surrounding environment and is not suitable for urban areas with dense traffic. The cover excavation method is a method in which the top is closed after the ground is excavated to a certain depth, and the rest of the substructure is constructed under the closed top cover. The cover-and-excavation method has higher cost and lower construction efficiency, but has less impact on surrounding traffic conditions. Based on the different characteristics of the open-cut method and the cover-excava...

AI Technical Summary

Problems solved by technology

"This technology can play an anti-leakage role when the deformation of the two underground diaphragm walls to be connected is basically the same. The deformation of the two underground diaphragm walls is quite different, resulting in tearing of the geomembrane at the interface

Therefore, this technology is only applicable to the case where there is no difference in deformation at the interface of the underground diaphragm wall, the application range is narrow, the reliability is low, the sealing effect of the geomembrane joint is not good, and a large amount of material is wasted, and the efficiency is relatively low

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