Method applied to airtight and waterproof treatment of gas tunnel

Abstract

The invention discloses a method applied to airtight and waterproof treatment of a gas tunnel. The method comprises the following steps: (1) fully paving waterproof plates on a primary support and protection surface and paving closed-hole type foam plastic cushions on the waterproof plates; (2) positioning middle embedded water stop belts in longitudinal construction joints; (3) positioning middle embedded water stop belts in annular construction joints; (4) secondarily lining, embedding the middle embedded water stop belts, placing water-swelling water stop strips in the longitudinal construction joints and embedding externally-pasted rubber water stop belts in the annular construction joints; (5) embedding joint-embedding materials into the construction joints; (6) eliminating danger, spraying water and falling dust; (7) detecting the airtight property of the tunnel after the tunnel is constructed, thus ending the whole construction process. The method can be used for overcoming the difficulty of the airtight and waterproof treatment caused when digging a high-concentration gas tunnel in the past, can also be used for overcoming the difficulty of hardly positioning the middle embedded water stop belts in the different construction joints, and is high in pertinence, simple and practical, high in operability, good in effect, high in construction quality and high in waterproof performance and airtight performance; the high construction speed is ensured.

Description

technical field [0001] The invention relates to the field of gas tunnel protection, in particular to a method for airtight and waterproof treatment of gas tunnels. Background technique [0002] The release of methane from porous rock and subsequent influx into underground workings depends on the permeability and pressure gradient of the rock mass. Before the tunnel construction, the rock mass and the gas stored in the rock mass are in an equilibrium state. When the tunnel construction is in progress, this balance is broken, and a passage for gas or groundwater to flow is formed. [0003] When the tunnel is excavated, the surrounding rock loose circle deformation zone formed around the tunnel produces a high permeability zone. When the tunnel is lined, the permeability of the broken surrounding rock in the deformation zone is greater than that of the lining, which is at least two orders of magnitude higher. The lining constitutes a low-permeability barrier. If the loose defo...

AI Technical Summary

Problems solved by technology

[0005] Currently, the airtightness and waterproof design of gas tunnels have great deficiencies. Most of the tunnels are waterproofed. In terms of protection for tunnels with high gas concentration, in addition to waterproofing, there is also the risk of prominent gas. How to ensure waterproofing and avoid gas protruding well, and the positioning method of the buried waterstop in the construction joint is also a difficult point in the construction, which is a problem that needs to be solved at present. The present invention aims at this situation. In the long-term research and practice, we have summed up the processing method that is combined with the actual engineering and can effectively ensure the construction