Shield reinforcing construction process

Abstract

The invention discloses a shield reinforcing construction process. A shield lanuching reinforcing soil body and a receiving reinforcing soil body are each divided into a first area soil body and a second area soil body along a shield excavation path, and the shield reinforcing construction process comprises the following steps that S1, reinforcing the first area soil bodies by adopting a high-pressure jet grouting pile and/or a three-axis mixing pile, and constructing the second area soil bodies by adopting a freezing method; and S2, performing freezing method construction on the outer ring ofa shield tunnel entrance door or a shield tunnel exit door in a lanuching well or a receiving well, and arranging freezing pipes in a circle shape, wherein the diameter of the circle is larger than that of the shield tunnel entrance door and that of the shield tunnel exit door. The shield reinforcing construction process can be applied to the situation that the surrounding environment is complexin the urban rail transit construction process, and a cutterhead can be effectively prevented from being frozen.

Description

technical field [0001] The invention relates to the technical field of shield tunneling engineering construction, in particular to a shield tunnel reinforcement construction technology. 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, the ground at the tunnel door must be reinforced. [0003] At present, there is a relatively mature technology for the reinforcement of the shield e...

AI Technical Summary

Problems solved by technology

In addition, the horizontal freezing method will be used. In the conventional horizontal freezing method, the outer ring freezing method and the cup bottom freezing method are used for construction. In order to ensure the construction safety in the process of digging the hole, the cup bottom freezing cannot be cancelled.

[0004] A certain amount of space is needed to place equipment during the cement-based reinforcement construction process, but the surrounding environment in the current urban rail transit construction process is relatively complex, which often cannot meet the cement-based reinforcement construction conditions; and the bottom of the cup freezes, causing the construction risk of freezing the cutter head

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