Construction method for treating rock mass cavity without formworks in tunneling

A technology for tunnel engineering and construction methods, applied in tunnels, tunnel linings, earth-moving drilling and mining, etc., can solve the problems of rockfall, easy occurrence of danger, large amount of engineering, etc., to ensure the quality of treatment, reduce construction risks, and low construction risks. Effect

Active Publication Date: 2016-06-22
CHANGAN UNIV +1
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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, i

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  • Construction method for treating rock mass cavity without formworks in tunneling

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[0032] Examples:

[0033] A construction method for treating the cavity of a rock mass without a template in a tunnel project includes the following steps:

[0034] Step 1: Set up the inner and outer protective layers;

[0035] Use PVC waterproof board + φ8 steel wire mesh 15cm, with 150cm support steel frame made of I20a steel frame, lay it at the intersection of the rock cavity and tunnel cavity, and then spray on the PVC waterproof board + steel mesh and support steel frame C20 concrete, after the concrete has solidified, check the shotcrete layer, supplement the vacancies and thin areas with shotcrete to form a 20cm thick outer protective layer; use the same construction steps to apply a 15cm thick inner protective layer on the inner side of the outer protective layer; The distance between the inner and outer protective layers is 70cm; the outer protective layer and the inner protective layer are equipped with drain holes and blow-fill holes, and are respectively pre-buried with...

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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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Application Information

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IPC IPC(8): E21D11/10
CPCE21D11/10
Inventor 贾艳领夏永旭张无畏周勇狄叶飞韩兴博
Owner CHANGAN UNIV
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