Tunnel connection channel construction method of shield interval

A technology for connecting passages and construction methods, applied in tunnels, tunnel linings, earthwork drilling, etc., can solve the problems of high construction cost, poor uniformity, long construction period, etc., and achieve the effect of saving horizontal transportation, good reinforcement effect, and efficient method.

Active Publication Date: 2009-12-09
CHINA TUNNEL CONSTR GUANGDONG
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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 uniformi

Method used

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Embodiment Construction

[0012] A method for constructing a tunnel communication channel in a shield section, comprising the following steps:

[0013] (1) A circle of closed plain concrete diaphragm wall is added as a water-stop curtain on the outer periphery of the reinforcement area. The plain concrete diaphragm wall is 800mm thick, and the concrete strength grade used is C20. The diaphragm wall within the tunnel range is mixed with C20+mortar It becomes plain concrete equivalent to the strength of C5, so that the shield machine tool can directly cut it, and ensure the shield machine to tunnel smoothly through the reinforcement. The water-stopping effect of the diaphragm wall is reliable. The diaphragm wall is constructed from the ground to the impermeable stratum, and together with the impermeable layer, forms a closed cylindrical outsourcing structure, which can cut off the water flow and prevent water erosion in the reinforced soil within the reinforcement range. And the role of seepage damage, t...

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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...

Claims

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Application Information

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IPC IPC(8): E21D11/04
Inventor 易觉方启超赵晖赖伟文王小军董维奇黎湛荣
Owner CHINA TUNNEL CONSTR GUANGDONG
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