Mountain tunnel arch non-roof collapse construction treatment method and structure

Abstract

The invention relates to the technical field of tunnel collapse treatment and particularly relates to a mountain tunnel arch non-roof collapse construction treatment method and structure. The method comprises the following steps that a, backfilling back pressure is conducted, specifically, hole slag is conveyed to the edge of a collapse cavity, arrangement is conducted below a non-collapse primary support layer through a long-arm machine, an arc surface and an end die are formed at the top of the hole slag, the end die is higher than the arc surface, and the arc surface is located in the collapse cavity; b, buried pipe capping is conducted, at least three steel pipes are buried in the upper portion of the hole slag, one end of each steel pipe extends into the collapse cavity, and the other end of each steel pipe is located in the tunnel; the joint of the hole slag and an inner wall of the collapse cavity is blocked; c, a protective arch is poured, specifically, concrete is poured into the collapse cavity from the position of the steel pipe to form the protective arch, and the pouring height of the concrete is smaller than the height of the end die; d, a primary support layer is repaired; and the steps a-d are repeated till the collapsed cavity is integrally repaired, and a second lining layer is constructed. The method has the effect of improving construction safety in the tunnel collapse treatment process.

Description

technical field [0001] The present application relates to the technical field of tunnel collapse treatment, in particular to a construction treatment method and structure for a non-roof fall collapse in the arch of a mountain tunnel. Background technique [0002] The tunnel project is an underground project. Due to the influence of the site environment, geological conditions and the existing technical level, the tunnel collapse may occur. The non-roof fall expansion in the cave is the most common situation in the tunnel collapse. When the collapse occurs, it will affect The use of the tunnel, or during the construction process affects the subsequent construction of the tunnel. When a non-roof fall collapse occurs in the tunnel, the following methods are usually adopted: 1. First, remove the collapsed body and then re-support; 2. Excavate and support after taking advanced support measures, and then backfill the collapsed position; Backfill the location, and take advance supp...

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Problems solved by technology

[0004] However, in the above-mentioned construction process, the inventor believes that the workers are easily exposed to the bottom of the landslide during the installation of the stainless steel curved plate, and the rockfall that occurs at any time at the landslide will cause harm to the workers

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