Method and device for treating tunnel secondary lining vault cavity and local loose part

Abstract

The invention belongs to a method and a device for treating a tunnel secondary lining vault cavity and a local loose part, and the device is characterized in that three slurry outlet holes with the diameter of 4mm are drilled in the positions of 90 degrees, 180 degrees and 270 degrees every 20cm on the pipe wall of a longitudinal grouting pipe, and the outer side of each slurry outlet hole is sealed by a PE (Polyethylene) film. Two exhaust holes with the diameter of 4 mm are drilled in the pipe wall of the longitudinal exhaust pipe at the 45-degree position and the 315-degree position every 20 cm, the outer side of each exhaust hole is sealed through a PE film, and the length of the longitudinal grouting pipe and the length of the longitudinal exhaust pipe are larger than that of a tunnel second lining pouring construction section. The longitudinal grouting pipes in the vertical pipes are communicated. According to the method, when the secondary lining concrete is finally set, the secondary lining concrete poured by the secondary lining is subjected to hole filling treatment grouting through the longitudinal grouting pipe, so that the integrity of the secondary lining concrete and grouting treatment slurry is improved, various concrete defects are repaired, a waterproof plate of a vault can be effectively prevented from being perforated and falling off, and the construction quality is guaranteed.

Description

technical field [0001] The invention belongs to a method and a device for treating the cavity and local loose part of the tunnel's second lining vault. Background technique [0002] During tunnel construction, geotextiles and waterproof boards must be laid on the lining arch surface layer before the concrete pouring of the second lining of the tunnel, and then the second lining concrete is formed by grouting with a molded grouting trolley. After the formation of the second lining concrete, voids and loose cement layers will form between the outer cement layer of the arch and the waterproof board, especially the voids and loose cement layers on the outer side of the vault, which will affect the construction quality of the tunnel lining. Therefore, it is necessary to backfill the cement slurry treatment to the voids and the undense parts of the cement layer. The conventional treatment method is to drill holes at the second lining concrete at the lower end of the vault voids an...

AI Technical Summary

Problems solved by technology

After the formation of the second lining concrete, voids and loose cement layers will be formed between the outer cement layer of the arch and the waterproof board, especially the voids and loose cement layers on the outer side of the vault, which will affect the construction quality of the tunnel lining

Therefore, it is necessary to backfill the cement slurry treatment to the voids and the undense parts of the cement layer. The conventional treatment method is to drill holes at the second lining concrete at the lower end of the vault voids and undense areas to communicate with the vault voids and undense areas, and then Inward grouting to close the vault cavity and the undense structure, but this method is not only time-consuming and laborious, high investment cost, long construction period, not easy to construct, but also often punctures the waterproof board or exists in the cavity during grouting. Insufficiency of gas pressure affecting grouting effect

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