Steel tube concrete and sprayed concrete stiff combined structure tunnel support system and construction method

Abstract

The invention provides a steel tube concrete and sprayed concrete stiff combined structure tunnel support system and a construction method. Multiple steel tube concrete arch frames are arranged and are sequentially arranged in the longitudinal direction of a tunnel, and each steel tube concrete arch frame comprises multiple spliced square steel segments and fine aggregate concrete materials injected in steel tubes. After splicing of each steel tube concrete arch frame is completed, injection and filling are carried out in a segmented manner. Multiple cotter shearing force parts are fixed to the longitudinal inner and outer tube faces of each steel tube concrete arch frame. The left side and the right side of each transverse partition plate are connected with L-shaped embedded plates, and the L-shaped embedded plates are fixed to the longitudinal tube faces of the steel tube concrete arch frames. Multiple ring steel bars are welded to each transverse partition plate in a penetrating manner. The space between the steel tube concrete arch frames is filled with sprayed concrete, and the thickness of the sprayed concrete is flushed with the steel tube concrete arch frames. By means of the system, the bearing force and corrosion resistance of the square steel arch frames are enhanced, and the bonding capacity of the support system and the sprayed concrete is improved.

Description

technical field [0001] The invention relates to the field of primary support structures of tunnels, in particular to a tunnel support system and a construction method of a rigid combined structure of steel pipe concrete and shotcrete. Background technique [0002] In recent years, with the country's investment and promotion of infrastructure construction. my country's transportation construction has achieved rapid development, especially the tunnel construction has made great progress, and the tunnel engineering construction is developing in the direction of complex geological conditions such as high ground stress and weak fracture zones. In the tunnel construction project, the initial support type of the tunnel is very important to its structural stability. Generally, the initial support of the tunnel includes wood support, section steel support, grid support, anchor shotcrete support and other methods. At present, the steel arch frame made of finished steel is mainly used...

AI Technical Summary

Problems solved by technology

In this system, the advantages of steel pipe and concrete complement each other, improve the compressive strength and corrosion resistance of the arch, solve the problems of weak bonding ability and poor synergy between shotcrete and steel arch, and solve the problem of steel arch under load. The problem of distortion and deformation of the lower instability

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