Construction method for treating rock mass cavity without formworks in tunneling

Abstract

The invention discloses a construction method for treating a rock mass cavity without formworks in tunneling. The method includes the following steps of firstly, arranging an inner protection layer and an outer protection layer; secondly, constructing a protection arch, wherein concrete is poured between the inner protection layer and the outer protection layer to form the protection arch; thirdly, conducting chamber excavation and preliminary support construction, wherein tunneling chamber excavation and preliminary support construction are conducted under protection of the protection arch, water leakage holes and hydraulic reclamation holes which are communicated with the protection arch are reserved in a preliminary support, and water leakage pipes and hydraulic reclamation pipes are embedded in the holes respectively; fourthly, forming a graded broken stone buffer layer through hydraulic reclamation, wherein hydraulic reclamation should be sequentially conducted on graded broken stone from bottom to top, and the whole hydraulic reclamation work is completed step by step; fifthly, forming a secondary lining through pouring. By means of the method, construction risks caused by tunnel rock mass cavity section collapse, stone falling and other disasters can be effectively reduced, the treatment speed is increased, the engineering cost is reduced, the treating quality of the tunnel rock mass cavity is ensured, safety during tunnel operation is improved, and the maintenance cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering construction, and in particular relates to a construction method for treating rock mass cavities without templates in tunnel engineering. Background technique [0002] In recent years, with the rapid development of my country's economy, high-grade highways continue to extend to the western mountainous areas, driving the rapid development of tunnel engineering. At the same time, the design and construction of tunnel engineering also encounter various problems that need to be solved urgently. For example, when tunnel construction and excavation encounter unfavorable geological areas such as weak interlayers, a little improper treatment measures will cause landslides, and large-scale landslides will be accompanied by large cavities; in addition, tunnel construction in karst areas often occurs Large karst cavities are encountered. When these cavities are disturbed by tunnel excavation, dis...

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Problems solved by technology

[0003] In the process of tunnel construction and excavation, a large rock mass cavity is encountered. The conventional method of backfilling has the disadvantages of large amount of work, long time, and high cost; the method of grouting is used to deal with it. In the case of no formwork to restrict the grouting range, it is very difficult It is difficult to control the quantity of grouting and construction quality, and it will block the cavity drainage channel; especially, in large rock cavity with rockfall, collapse, or even collapse, construction personnel and equipment are exposed to danger for a long time, which is prone to danger

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