A construction method for treating rock mass cavities without formwork in tunnel engineering

Abstract

The invention discloses a construction method for treating a rock mass cavity without templates in tunnel engineering, which comprises the following steps: step 1, setting inner and outer protection layers; step 2, constructing a protective arch between the inner protection layer and the outer protection layer Pour concrete to form a protective arch; step 3, excavate the cavern and apply initial support, under the protection of the protective arch, carry out excavation of the tunnel engineering cavern and initial support construction; the initial support is reserved to communicate with the protective arch Drainage holes and blow-fill holes are pre-buried in the holes respectively. Drainage pipes and blow-fill pipes are pre-buried; step 4, blow-fill graded gravel buffer layer, blow-fill graded gravel should be blown-fill in sequence from bottom to top, and gradually complete the entire Blow filling work; step five, pouring secondary lining. The invention can effectively reduce the construction risks caused by disasters such as landslides and rockfalls in the rock cavity section of the tunnel, accelerate the treatment speed, reduce engineering costs, ensure the treatment quality of the tunnel rock cavity, improve the safety of the tunnel during operation and reduce maintenance cost.

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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