Tunnel support structure and tunnel support construction method

Abstract

The invention discloses a tunnel support structure and a tunnel support construction method. First pressure-bearing parts penetrate through first arch frames and thus make direct contact with the first arch frames, thus force transmission between the first pressure-bearing parts and the first arch frames is smooth, the first arch frames can more reliably transmit borne external force to first anchor pipes and second anchor pipes, overall sinking of the tunnel support structure or tunnel arch apex sinking and peripheral surrounding rock convergence are effectively controlled, and the situationthat due to the welding quality problem or insufficient shear capacity of a weld joint, the external force borne by the first arch frames cannot be effectively transmitted is avoided; meanwhile, everytwo adjacent first arch frames are connected together through a connector, the contact area with a lower step soil body which has not been excavated yet is expanded, and the carrying capacity of thesoil body to the first arch frames is improved; and in addition, every two adjacent bases are connected together through a connector to form a stable transverse cantilever beam, and sinking of the overall structure of the first arch frames due to not-timely foot connecting after lower step excavation is avoided.

Description

technical field [0001] The invention relates to the technical field of tunnels, in particular to a tunnel support structure and a tunnel support construction method. Background technique [0002] With the rapid development of highways, highway tunnels have become an indispensable building for highways. In order to shorten the distance between the two places, drilling holes in mountains has become the best choice. With the increase in the amount of tunnel construction, different With more and more different geological formations, tunnels with weak surrounding rocks will inevitably be encountered. [0003] Weak surrounding rock tunnel refers to the surrounding rock whose surrounding rock grade is V or VI, and has the following characteristics: 1. The surrounding rock is weak in rock quality, low in bearing capacity, well-developed in joints and fissures, and broken in structure. Generally, shale, Soft rock strata represented by mudstone, schist, carbonaceous rock, and phyllit...

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used control measure is to set four anchor bolts or small conduits with locking feet at the connection of the initial support I-beam arch. However, the traditional control measures cannot effectively control the external force on the I-beam arch. It is transmitted to the lock foot bolt or the lock foot small conduit, so the overall sinking of the tunnel support structure or the sinking of the vault and the excessive convergence of the surrounding area are caused.

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