Existing tunnel lining reinforcement structure and reinforcement method

Abstract

The invention discloses an existing tunnel lining reinforcement structure and a reinforcement method. The reinforcement structure is characterized in that arch lining steel frames serve as main supporting structures and are adopted for supporting formwork to form supporting units, a distance between the inner side of each supporting unit and an existing tunnel lining is smaller than 37.5cm to guarantee catenary safety and construction safety, concrete is poured to the inner side of the supporting formwork repeatedly, and the lining steel frames and the formwork are demounted after pouring is finished. According to the reinforcement method, the existing tunnel is equally segmented, segments are sequentially numbered, the supporting units are erected at intervals on odd segments, width of the supporting units is determined according to the segmenting conditions and stress conditions in a concrete pouring process, each supporting unit forms an independent concrete pouring cavity, concreteend faces of odd segments serve as end moulds of the even segments, and only inner side formwork supporting is needed; by segmented pouring, the lining steel frames can be demounted conveniently, influences on concrete service life due to pouring of the lining steel frames in concrete are avoided, and operating efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to an existing tunnel lining reinforcement mechanism and a reinforcement method. Background technique [0002] In tunnel engineering, lining is a permanent support structure built with reinforced concrete and other materials along the periphery of the tunnel body to prevent rock and soil deformation or collapse. Due to the influence of the environment and the climate environment, some linings have problems of water seepage and block loss, which seriously affect the driving safety in the tunnel, especially in railway tunnels, because when the train passes at high speed, on the one hand, wind pressure will be formed, and on the other hand, it will generate strong wind pressure. The vibration, wind pressure and vibration will aggravate the damage of the lining. In order to solve the above technical problems, the existing lining needs to be strengthened and repaired. For roa...

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Problems solved by technology

[0003] However, for the railway tunnels in operation, the difficulty increases suddenly. On the one hand, because the current railway is basically an electrified railway line, there is a catenary inside the tunnel, which must be avoided during the construction process. The secondary lining also needs to keep a certain distance from the catenary. The radial space between the existing lining and the catenary is 37.5 cm. If a secondary lining of 25 cm is added, if the existing formwork support system is used It is difficult to complete. On the other hand, the construction can only be carried out at the skylight point of the railway operation, and it is necessary to realize rapid construction in stages. It is difficult to realize the structure of the existing supporting formwork of the full hall.

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