Method for preventing surface collapse when shield tunneling machine starts and immediately underneath passes existing shield tunnel

Abstract

The invention provides a method for preventing surface collapse when a shield tunneling machine starts and immediately underneath passes an existing shield tunnel. The method for preventing surface collapse when the shield tunneling machine starts and immediately underneath passes the existing shield tunnel specifically comprises the steps that firstly, multiple layers of pipe sheds are arranged between a shield tunnel portal contour line and an existing tunnel, then an extension steel ring is added at a shield tunnel portal opening, the steel ring is reinforced by adopting a steel ring support structure, the extension steel ring is connected with a portal pre-embedded ring plate, at least two wire brushes are arranged in the middle of the extension steel ring, a cord fabric rubber plate is arranged on the end part of the extension steel ring, a plurality of cavities are formed, a ring of ball valves are mounted on the position, corresponding to every cavities, outside the extension steel ring, an anti-head-planting structure is arranged on the bottom of the extension steel ring, finally, a shield tunneling machine cutter disc is improved before a shield goes down a well, a strengthened net is arranged on the opening position of the cutter disc, and anti-twist blocks are arranged on a shield body. According to the method for preventing surface collapse when the shield tunnelingmachine starts and immediately underneath passes the existing shield tunnel, it is guaranteed that in the process of starting and immediate underneath passing an existing line, the existing line is not influenced, shield construction can be completed in planned time, and whole subway construction is not delayed.

Description

technical field [0001] The invention belongs to the field of shield construction, and specifically relates to a construction method for preventing ground subsidence when a shield machine starts to pass through an existing shield tunnel. Shield machine transformation, shield grouting and other construction steps increase the stability of the starting section of the shield tunneling, establish a complete and effective soil chamber pressure before the starting of the shield tunneling, and ensure that the shield machine is safe, fast and efficient at the starting time. Pass through the existing shield tunnel smoothly to prevent ground subsidence when the shield machine starts to go down the existing shield tunnel. Background technique [0002] With the rapid development of my country's economy, people's pace of life is gradually accelerating, and more and more people begin to flock to the city, which puts pressure on urban traffic. An important means of transportation for traffi...

AI Technical Summary

Problems solved by technology

Whether it is to establish the pressure of the soil bin in advance or the grouting of the segment, the requirements for the construction period, the working environment and the construction space are relatively high. For some construction projects with tight construction schedules, limited working environment and limited space, there will be construction difficulties, and even Unable to construct

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