Construction technology for tunnel trunk primary support
A technology of primary support and construction technology, applied in tunnels, tunnel linings, shaft equipment, etc., can solve problems that affect the rapid construction and safe operation of tunnels, large deformation of surrounding rock extrusion and even landslides, and support structure instability, etc., to achieve The effects of eliminating potential safety hazards, stabilizing the foundation, and speeding up the construction progress
Active Publication Date: 2019-07-12
CCCC THIRD HARBOR ENG +2
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Problems solved by technology
[0002] In recent years, with the rapid development of my country's transportation industry, a large number of deep-buried mountain tunnels will pass through water-rich and high-in-situ stress areas. Improper construction will easily lead to the reduction of the tunnel section and the instability of the support structure, seriously affecting the rapid construction of the tunnel and the safe operation in the future
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[0029] The present invention will be further described below in conjunction with accompanying drawing.
[0030] see Figure 1 to Figure 4 , the construction technology of the initial support of the tunnel body of the present invention includes the following processes: initial spraying of concrete, steel support installation, advance support of the next cycle, installation of steel mesh, re-spraying of concrete and installation of system anchor rods;
[0031]When carrying out the primary spraying concrete process, adopt the wet spraying process and include the concrete preparation step and the concrete spraying step;
[0032] When performing the concrete preparation step, the following materials are used to configure the concrete: cement, sand, crushed stone, quick-setting agent and water; the cement is ordinary Portland cement; the fineness modulus of the sand is greater than 2.5, and the moisture content is 5-7%; The maximum particle size of the crushed stone is not greater ...
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The invention discloses a construction technology for tunnel trunk primary support. The construction technology for tunnel trunk primary support comprises the following steps of initial shotcrete, steel shotcrete installation, advanced support of a next cycle, reinforcing mesh installation, compound shotcrete and system anchor rod installation. When the step of initial shotcrete is carried out, awet spraying technology is adopted. The steel shotcrete installation process comprises the following steps of steel shotcrete manufacturing and steel shotcrete erection. Advanced small duct support iscarried out when the advanced support of the next cycle is carried out. The reinforcing mesh installation process comprises the steps of reinforcing mesh machining and reinforcing mesh installation pavement. When system anchor rod installation is carried out, a hollow grouting anchor rod is adopted according for a V-level surrounding rock segment. A cement mortar anchor rod is adopted for an IV-level surrounding rock segment. A cement mortar anchor rod is adopted for an III-level surrounding rock segment. The system anchor rod installation process comprises the steps of anchor rod manufacturing, anchor rod drilling, grouting and anchor rod installation. The construction technology for tunnel trunk primary support can perform effective reinforcement processing on tunnel surrounding rock, tunnel deformation is rapidly restrained, and the purpose of tunnel permanent support is achieved.
Description
technical field [0001] The invention relates to a construction technique for initial support of a tunnel body. Background technique [0002] In recent years, with the rapid development of my country's transportation industry, a large number of deep-buried mountain tunnels will pass through water-rich and high-in-situ stress areas. Improper construction will easily lead to the reduction of the tunnel section and the instability of the supporting structure, which will seriously affect the rapid construction of the tunnel and the safe operation in the future. After the excavation of the tunnel, in order to control the stress release and deformation of the surrounding rock in an appropriate amount, increase the safety of the structure and facilitate the construction, immediately after the excavation of the tunnel, a structural layer with less rigidity and as part of the permanent bearing structure is constructed. Contents of the invention [0003] The purpose of the present in...
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IPC IPC(8): E21D11/00E21D11/10E21D20/02E21D11/18
CPCE21D11/003E21D11/105E21D11/18E21D20/02
Inventor 陈继高国庆郭新杰陈浩闫威
Owner CCCC THIRD HARBOR ENG
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