Method and device for joint reinforcement of underground diaphragm wall

Abstract

The invention relates to a method and a device for reinforcing a joint of an underground continuous wall, and relates to the technical field of leakage plugging of the underground continuous wall. The steps of the method include: (1) forming a groove in the underground diaphragm wall, performing ultrasonic detection on the verticality of the groove, performing joint brushing, and hoisting to complete the underground diaphragm wall reinforcement cage; (ii) placing the joint grouting pipe fixing frame; Slurry pipe...; IV lowering the concrete pouring conduit...; V The concrete strength of the diaphragm wall reaches 50% of the design strength and above, and the concrete pouring time is not less than 5 days, and the joints of the diaphragm wall are reinforced through the grouting pipe Slurry injection…. The invention solves the problems of mud inclusion, concrete segregation and non-compactness in the joints of the underground continuous wall, effectively prevents the problems of water leakage and quicksand of the underground continuous wall during the excavation of the foundation pit, and proposes a corresponding device. Compared with the underground diaphragm wall plugging method in the process of foundation pit excavation, it has the advantages of safety, low risk, low cost, high efficiency and high quality.

Description

technical field [0001] The invention relates to the technical field of leakage plugging of underground continuous walls, in particular to a method and a device for strengthening joints of underground continuous walls. Background technique [0002] With the development and utilization of urban underground space in my country, the depth of underground engineering construction is getting deeper and deeper. For cities in coastal or riverside soft soil areas, foundation pit engineering is an important part of underground engineering, and the enclosure structure is the premise to ensure the safety of foundation pit engineering. Affected by the constraints of the surrounding conditions of the city and the complexity of geological conditions, the underground diaphragm wall is used as the enclosure structure in the deep foundation pit project in the soft soil area. During the excavation of the foundation pit, when there is water leakage and quicksand in the foundation pit, the leaka...

AI Technical Summary

Problems solved by technology

In addition, the cost of using these plugging methods is high

[0003] For the underground diaphragm wall adopting milling joints and locking pipe joints, mud is likely to be trapped in the joints between the first and second underground diaphragm walls, which will lead to water leakage of the enclosure structure during foundation pit excavation. Quicksand, especially in pressurized water formations, can cause foundation pit leakage accidents

When the foundation pit is excavated at a depth of 20m or above and is affected by confined water, this plugging method may fail, which may lead to a burst of confined water or a piping accident, resulting in serious economic losses and damage to the surrounding environment

Images