Tunnel arch prefabricated segment assembling construction method

Abstract

The invention discloses a tunnel arch prefabricated segment assembling construction method. The method comprises the steps that A, arch prefabricated segment reinforcement cage binding construction is conducted on a prefabrication yard outside a tunnel hole; B, arch prefabricated segments are poured and formed; C, after the arch prefabricated segments are prefabricated, grouped mounting is conducted in the mode that jacking is conducted firstly and then longitudinal sliding is conducted; and D, every 5-6 arch prefabricated segments form a group, after one group is mounted, arch back grouting and arch prefabricated segment and side wall joint grouting are conducted, and all bolts in bolt sinking tables are dismounted after grouting is completed. The tunnel arch prefabricated segment assembling construction method is applied to tunnel assembling type lining construction, the effect that arch prefabricated segment construction is safe and stable is ensured, and accurate lap joint with a cast-in-place side wall can be achieved.

Description

technical field [0001] The invention belongs to the technical field of tunnel concrete lining construction, and in particular relates to a construction method for assembling prefabricated segments in a tunnel arch, which is specially used for an assembled lining structure. Background technique [0002] The traditional construction technology of the second lining of the tunnel adopts full-circle steel bar binding, combined with a fully hydraulic lining trolley, and pours concrete into the vertical pouring holes on the top hole by hole to carry out the concrete pouring of the second lining of the whole ring. The mining method tunnel adopts a series of equipment modification such as controlled under-excavation, window-based mold entry, concentrated vibration, molded grouting and other equipment modification and process and construction method improvement measures. The lining quality has been greatly improved, but the lining strength and thickness of the tunnel arch are insuffici...

AI Technical Summary

Problems solved by technology

The mining method tunnel adopts a series of equipment modification such as controlled under-excavation, window-based mold entry, concentrated vibration, molded grouting and other equipment modification and process and construction method improvement measures. The lining quality has been greatly improved, but the lining strength and thickness of the tunnel arch are insufficient. Quality defects such as lack of compactness and gaps at the back are still very prominent

In recent years, through various inspection methods, it has been found that the railway tunnels that have been laid or opened for operation have the above-mentioned quality defects to varying degrees. Among them, the quality problems of the arch are the most prominent, and there are safety hazards such as falling blocks during the operation process, which has caused great harm to the operation safety. Great impact, its defects need to be dealt with

Since some tunnels have already been track laid or operated, a lot of manpower, financial resources and time will be spent on the later renovation, the workload and difficulty of the renovation are huge, and it is difficult to meet the original design standards and use functions

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