Tunnel initial stage support waterproof board weld air tightness detection method

Abstract

The invention belongs to the tunnel waterproof engineering technology field and particularly relates to a tunnel initial stage support waterproof board weld air tightness detection method. The method comprises steps that 1, an electric climb welder is utilized to carry out dual-weld welding at two sides of a splicing portion of a waterproof board to form a non-completely closed reserved cavity, and two ends of the waterproof board have openings; 2, a pinhead of a syringe needle is inserted into one opening of the waterproof board to make the pinhead of the syringe needle stay in the reserved cavity; 3, glue is filled between a slit portion between the syringe needle and the waterproof board, and the glue, the waterproof board and the syringe needle are fixedly connected into one body through welding; after the glue is solidified, inflation of the reserved cavity of the closed waterproof board is carried out by an air tightness detector through the syringe needle, when pressure of a pressure meter of the air tightness detector reaches 0.25Mpa, inflation stops, after 15 minutes, if the pressure of the pressure meter decreases within 10%, weld welding quality is proved to be qualified, otherwise, weld welding quality is proved to be disqualified.

Description

Technical field [0001] The invention belongs to the technical field of road tunnel waterproof and drainage engineering. Background technique [0002] The waterproof board for tunnels is a water-proof material made of polymer materials and is a component of the tunnel composite lining structure. The specific installation method is to pave and hang on the surface of the sprayed concrete initial support, and then carry out the secondary lining concrete pouring. The tunnel waterproof board can prevent the tunnel groundwater from seeping to the second lining concrete part, thereby preventing groundwater leakage from the lining concrete surface, improving the safety and service life of the tunnel, and ensuring the safety of tunnel driving. [0003] At present, the laying of waterproof boards for tunnels mostly adopts the tunnel circular laying method. This method only needs to set a splicing joint perpendicular to the longitudinal direction of the tunnel between every two circularly lai...

AI Technical Summary

Problems solved by technology

The disadvantage of this inspection method is that: the air channel is formed when the weld seam is welded, and it needs to be inserted into the air channel after piercing the waterproof board during the inspection. The injection needle will form a pinhole on the waterproof board, and the gap between the pinhole and the needle wall Without sealing treatment, when the air pump inflates the sealed air channel, the gas in the air channel will leak along the gap between the needle hole and the injection needle, which will eventually lead to a large error in the test result of the air tightness of the gas, causing construction personnel to misunderstand. sentence

However, no one has discovered this problem in the existing literature or during actual construction. The inventor has carried out actual measurement on this problem and found that the detection result is distorted due to the pinhole gap, which has affected the actual judgment.

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