Drilling and blasting tunnel structure adopting prefabricated inverted arch

Abstract

The invention relates to a drilling and blasting tunnel structure adopting a prefabricated inverted arch. An arch part is an initial support of a tunnel; a secondary lining of a cast-in-place arch wall is arranged in the initial support of the tunnel; the lower end of the secondary lining of the cast-in-place arch wall and a fabricated inverted arch prefabricated block at the bottom are connectedinto a ring through a cast-in-place inverted arch lining; the end parts of both sides of the fabricated inverted arch prefabricated block are provided with fabricated inverted arch block two-side expansion ends; and the end faces are provided with tenons which are in butt joint with blind mortises on the end faces of the cast-in-place inverted arch lining. The drilling and blasting tunnel structure meets the requirements for the basic structural form of the tunnel fabricated inverted arch, and the inverted arch structure is prefabricated in factory-like and standardization modes, so that the reliable quality is ensured, and the quality, strength and other properties of a prefabricated component are much better than those of a cast-in-place structure.

Description

technical field [0001] The invention belongs to the technical field of tunnels and underground engineering, and in particular relates to a drill-and-blast tunnel structure using prefabricated and assembled inverted arches. Background technique [0002] With the continuous improvement of construction technology, construction level and construction requirements, more and more new technologies, new processes and new construction methods are applied to the construction of tunnels and underground projects. Prefabricated buildings are a major change in construction methods, which are conducive to saving resources, reducing construction pollution, improving the working environment, improving labor production efficiency, improving standardized operations, and ensuring quality and safety levels. However, limited by various factors, the current drilling and blasting construction method of tunnel construction is still mainly cast-in-situ, and the proportion of prefabricated tunnel cons...

AI Technical Summary

Problems solved by technology

[0003] According to the statistics of the railway tunnels currently in operation, especially the high-speed railway tunnels, some tunnels have problems such as bulging of the bottom arch, mud and mud, which will lead to cracking and deformation of the ballast bed in severe cases, resulting in the speed limit of the tunnel and affecting the normal operation of the high-speed railway.

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