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
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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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