Shield tunnel portal sealing device and shield tunnel portal sealing method

Abstract

The invention belongs to the technical field of shield tunnel engineering and particularly relates to a shield tunnel portal sealing device and a shield tunnel portal sealing method. The shield tunnel portal sealing device comprises a lined wall, an embedded steel ring is arranged on the lined wall, a sealing box is arranged on the embedded steel ring and comprises a sealing steel ring, a fixing plate, a fold type support plate and two waterproof structures, a plurality of grease injecting holes are evenly circumferentially reserved in the sealing steel ring between the two waterproof structures, each waterproof structure comprises a steel wire brush and a cord fabric rubber plate, the cord fabric rubber plates are arranged on one side close to the embedded steel ring, and grouting holes are reserved in the lined wall and in the sealing steel ring on the inner sides of the cord fabric rubber plates. The shield tunnel portal sealing device has the advantages that the cord fabric rubber plates are primarily used for sealing to prevent a major part of water and soil from pouring out, so that 'pouring prevention' is achieved; water penetration is prevented as the steel wire brushes secondarily achieve seamless contact with a shield tunneling machine shell or duct pieces; and the grouting holes reserved in the lined wall and the sealing steel ring can achieve grouting sealing timely in emergencies.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel engineering, and in particular relates to a shield tunnel door sealing device and method. Background technique [0002] During the construction of shield tunneling, the failure of the door seal at the exit stage is one of the important sources of construction risk. The main and most common manifestation of the risk is water gushing and sand gushing at the door. The rationality and reliability of the door sealing device directly affect the results of dangerous situations. The failure of the door seal will directly threaten the safety of the operators, leading to the flooding of the shield end well, the burial of the shield machine, and even structural instability. [0003] At present, the commonly used two waterproof devices for sealing the door are as follows: figure 1 As shown, during the construction of the lining wall 1, a pre-embedded steel ring 2 is installed at the portal, and a steel...

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the above-mentioned waterproof system is that the cord rubber sheet has a strong integrity. Since the shield casing may have convex and concave surfaces (such as the weld seam on the shield casing formed during the assembly and debugging of the shield machine), the overlapping of the shield casing The cord rubber plate on the machine cannot form a seamless contact with the shell, forming a tiny water seepage channel through which water overflows, and during the process of injecting sealing grease into the sealed box through the grease injection hole, the grease will be squeezed out through the water seepage channel , causing a lot of inconvenience to the construction

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