Restoration method for lining cavities of highway tunnels with poorer surrounding rock

Abstract

The invention discloses a restoration method for lining cavities of highway tunnels with poorer surrounding rock. The restoration method comprises the following steps of a, detecting the condition ofcavity or cavity beneath slab; b, determining the small duct grouting area at the determined cavity or non-dense part, and excavating and chiseling secondary lining concrete; c, distributing drillingholes in the secondary lining concrete, and installing grouting pipes; d, adopting a first grouting material to complete low-pressure grouting; e, adopting a second grouting material to complete high-pressure grouting; f, after the secondary grouting is initially set, detecting and inspecting; g, after the second grouting material is initially set, adopting a third grouting material to complete high-pressure grouting; g, touching up a waterproof plate in the secondary lining concrete; i, fully constructing one layer of sealing patch on the waterproof plate; j, arranging anchor screws at the inside surface of the secondary lining concrete; k, cleaning the waterproof plate; l, arranging a reinforcement net; m, building a mould for rebuilding; n, removing the inclined steel mould, cutting andfinishing. The restoration method has the advantages that the problems of structure safety, water protection and drainage, attractive appearance of tunnel building and the like can be effectively solved; the to be treated range is determined mainly by adopting a geology radar cooperating with a geology hammer for detection.

Description

technical field [0001] The invention relates to a method for repairing the lining cavity of a highway tunnel with poor surrounding rock. Background technique [0002] With the rapid development of my country's traffic, the mileage of various roads is increasing, and the number of newly-built and completed tunnels is also increasing year by year. Various tunnel diseases or defects affect the safety of the tunnel, especially the common tunnel lining in poor surrounding rocks. Lining cavity disease or not dense defects. Tunnel protection generally consists of three layers, from the inside to the outside are the primary support layer, the water-proof layer and the secondary lining layer, and the water-proof layer is mostly made of waterproof boards. However, due to various reasons, after the secondary lining layer of the newly-built tunnel was removed, it was found by geological radar that the backfill behind the primary support was not dense, the backfill was empty or even a la...

AI Technical Summary

Problems solved by technology

However, for large-area primary support problems and structural safety problems caused by insufficient thickness of the secondary lining, additional engineering reinforcement measures need to be considered

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