Shield tunnel end reinforcement method

Abstract

The invention discloses a shield tunnel end reinforcement method. The shield tunnel end reinforcement method comprises the steps that a three-axis mixing pile or a high-pressure jet grouting pile is adopted to reinforce a stratum at a tunnel door, so that soft soil is hardened to increase the stratum strength at the tunnel door; and then in a working well in which a shield machine starts or arrives, a certain number of freezing holes in the extending direction of a shield tunnel are inwardly arranged in a wall to be constructed in the circumferential direction of the tunnel door, and freezingtubes are arranged in the freezing holes for freezing and reinforcing the stratum at the tunnel door. The shield tunnel end reinforcement method solves the problems that the safety risks of start andarrival of the shield machine are increased due to the fact that the environment at the tunnel door is relatively complicated and cement system reinforcement in the form of a combination of the three-axis mixing pile and the high-pressure jet grouting pile cannot be performed due to ground environment restrictions, and the construction risks of start and arrival of the shield machine are reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering construction, in particular to a method for reinforcing the end of a shield tunnel. Background technique [0002] At present, the shield tunneling method is widely used in subway construction in various parts of my country. The shield tunnel enters the tunnel stratum from the working well or is pushed out from the end of the tunnel to enter the working well. For sandy soil or saturated water-containing clay, if it is not reinforced, a large amount of soil and groundwater will collapse into the working well behind the working well enclosure, resulting in a large area of ​​ground subsidence around the cave, endangering the underground Pipelines and nearby buildings. Therefore, before the shield machine enters and exits the tunnel, it is necessary to strengthen the ground at the tunnel door, that is, to strengthen the end. End reinforcement is an important part of the shield machine's depa...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a shield tunnel end reinforcement method to solve the problem that the environment at the entrance is relatively complex, and the end reinforcement cannot meet the cement system reinforcement construction conditions, resulting in an increase in the safety risk of the shield tunnel starting and arriving. Reduce the risk of shield starting and reaching construction

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