Tunnel connection channel construction method of shield interval

Abstract

The invention discloses a tunnel connection channel construction method of a shield interval, which comprises the following steps: 1. an enclosed plain concrete continuous wall which is used as a water sealing curtain is arranged at the periphery of the connection channel ; 2. a mixing pile or grouting is adopted inside of the connection channel area to reinforce soil body; 3. excavating vertical well construction is carried out within the range of a reinforce area; 4. a subsurface excavation method is adopted to carry out excavation and lining construction for the connecting channel from both sides of the vertical well. 5. after the construction of the connecting channel interval is completed and a shield machine entirely passes through a reinforce body, a tube sheet positioned at the connecting channel portal is cut off, the portal waterstop and the portal structure of the connecting channel are constructed; the lining structure of the connecting channel positioned at the vertical well is also constructed and the vertical well is refilled, finally the connecting channel is completed; the stratum reinforce construction method of the connecting channel is high in efficiency and safe, can be promoted and applied to the construction of reinforcing stratum for changing the tool bits of the shield machine, thereby providing reliable guarantee for changing the tool bits of the shield machine.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a construction method for a communication channel in a shield tunneling project. Background technique [0002] In the previous projects, the ground reinforcement method of the connecting channel in the shield tunneling project was reinforced by one or more combinations of stirring pile reinforcement, jet grouting pile reinforcement, grouting reinforcement or freezing method reinforcement methods. However, when it is necessary to strengthen the soft ground with rich groundwater, strong water mobility and large void ratio, if cement slurry material is used for reinforcement, the cement slurry will often cause the occurrence of slurry flow, segregation, etc., resulting in low strength of the reinforced soil. , large porosity, poor uniformity, self-stabilization and strong permeability, which eventually lead to reinforcement failure; if the freezing method is used for reinforceme...

AI Technical Summary

Problems solved by technology

However, when it is necessary to strengthen the soft ground with rich groundwater, strong water mobility and large void ratio, if cement slurry material is used for reinforcement, the cement slurry will often cause the occurrence of slurry flow, segregation, etc., resulting in low strength of the reinforced soil. , large porosity, poor uniformity, self-stabilization and strong permeability, which eventually lead to reinforcement failure; if the freezing method is used for reinforcement, there are also problems of long construction period, high construction cost, adverse effects of frost heaving, and rapid groundwater flow. The ground freezing effect is not ideal and other deficiencies