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Shield burial method for receiving and plugging overexcavation gap in high-water-pressure stratum

A high water pressure, shield technology, applied in underground chambers, earthwork drilling, wellbore lining, etc., can solve the problems of prone to accidents and high risk of shield receiving, achieve great promotion value and economic benefits, and avoid disasters Effects of Sexual Accidents

Active Publication Date: 2010-11-24
CHINA RAILWAY NO 3 GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the existing shield receiving wall thickness over-excavation gap waterproof plugging technology is not suitable for high water pressure formations, resulting in high risk of shield receiving and accident-prone problems, the invention provides a shield tunneling buried in high water pressure formations Method of receiving and plugging over-excavation gap

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  • Shield burial method for receiving and plugging overexcavation gap in high-water-pressure stratum

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Embodiment Construction

[0026] The specific embodiment of the present invention will be further described in conjunction with the accompanying drawings.

[0027] In order to ensure the safe reception of shield tunneling in high water pressure water-bearing sand formations, submerged shield tunnel reception is required, and a separate space with a size larger than the main body of the shield machine is reserved in advance at the receiving station or during the construction of the station as shield tunnel reception Wells and shield receiving wells must be watertight and able to withstand the external water pressure of the station. The layout of shield receiving wells is as follows: figure 1 shown.

[0028] Before the shield machine arrives (generally 10-20m away from the portal), the concrete and steel bars of the receiving portal are broken, and then a circular groove is chiseled in the portal circle, and a double-layer freezing pipe is laid and fixed in the chiseled circular groove. Freezing pipes a...

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Abstract

The invention belongs to the technical field of waterproofing plugging of tunneling overexcavation gaps, and particularly relates to a shield burial method for receiving and plugging an overexcavation gap in high-water-pressure stratum. The invention solves the problem that the existing overexcavation gap waterproofing plugging technique is not suitable for high-water-pressure stratum, has high risk for shield receiving and can easily induce accidents. The method comprises the following steps: preserving a shield receiving well; breaking the wall of the shield receiving well to chisel out an annular groove, and laying freezing pipes in the annular groove; filling water into the shield receiving well, or filling water after filling soil; impelling the shield machine until only the shell of the shield tail is still in the entrance / exit ring of the tunnel; starting freezing, and injecting grout into the overexcavation gap; pumping water when the shield receiving well is isolated from the outside confined aquifer; and after pumping water to remove silt, cutting off part of the shield tail, and lifting out the disassembled shield machine, thereby completing receiving. The invention has the beneficial effects of ensuring that the shield can be received in the high-pressure fine sand layers and other severe strata, and preventing catastrophic accidents in shield receiving in unfavorable strata.

Description

technical field [0001] The invention belongs to the technical field of water-proof and leak-proof plugging of overcut gaps behind segment walls when shield tunnels are received in a shield tunnel construction project, and in particular relates to a method for shield tunnel submerged receiving and plugging over-cut gaps in high water pressure formations. Background technique [0002] The existing waterproof and plugging technologies for over-excavating gaps behind the segment wall during shield receiving mainly include: [0003] ①Pressure-injection double-fluid cement mortar waterproof plugging technology. This is a commonly used method of waterproofing and plugging when receiving shield tunneling, that is, before breaking the door when receiving shield tunneling, use cement slurry and a certain proportion of water glass to inject it into the over-excavated gaps behind the segments and shield walls. In order to prevent groundwater, especially groundwater with a certain press...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/38
Inventor 辛振省
Owner CHINA RAILWAY NO 3 GRP CO LTD
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