Temporary steel support demolition construction method for large-section multi-pilot-tunnel tunnel
A construction method and steel support technology, applied in tunnels, earthwork drilling, mining equipment, etc., can solve problems such as tunnel structure deformation, achieve the effects of ensuring safety and stability, facilitating force balance, and reducing risks
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[0037] Such as Figure 1-4 As shown, a construction method for removing the temporary steel support of a large-section multi-pilot tunnel. When the tunnel is excavated, the large section is divided into multiple steps and multiple pilot tunnels through steel supports for construction. After the construction is completed, the temporary steel support needs to be removed. Temporary steel supports are carried out sequentially prior to each subsection of the permanent structure, and the removal length is determined by structural force calculations and on-site monitoring data analysis. Specifically, the temporary support includes multiple horizontal braces and vertical braces, which are vertically arranged and connected according to the design. All horizontal braces and vertical braces are composed of section steel, mesh, rectangular tube, and shotcrete. The section steel is the skeleton, and the mesh Connect pieces of section steel with rectangular tubes, and finally spray concrete...
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