Method for automatically constructing support of confined concrete arch center for underground tunnel

Abstract

The invention discloses a method for automatically constructing support of a confined concrete arch center for an underground tunnel. The confined concrete arch center at least comprises two sections, adjacent sections are hinged at joints, the contact surfaces of joints of two adjacent sections are structures matched with each other, the structure of the contact surface of one section is a convex structure, while the structure of the contact surface of the other section is a concave structure matched with the convex structure, a structure is arranged between the convex structure and the concave structure and is used for engaging and fixing the two structures when the two structures are in a matched state, and each section is of a composite structure of which square steel or round steel is filled with concrete. The arch center adopting a foldable mode can be automatically unfolded in the constructing process, does not need manual field splicing, and is safe and efficient; and the concave structure and the convex structure which are matched with each other are arranged on contact surfaces of the joints, and the engaging structures are arranged, so that the confined concrete arch center is automatically engaged when being extended, construction is facilitated, and the support strength of the confined concrete arch center is guaranteed.

Description

technical field [0001] The invention belongs to the field of underground engineering support, and in particular relates to an automatic construction method for constrained concrete arch support suitable for underground tunnels. The constrained concrete arch can be highlighted in complex geological conditions such as soft rock, high stress, and fault fracture zones. Stronger carrying capacity. Background technique [0002] In recent years, with the rapid development of the scale and speed of tunnel construction, it is inevitable that the planned tunnels will pass through strata with complex conditions such as high stress and weak fracture zones. Geological conditions continue to deteriorate, and the surrounding rock structure, mechanical properties, strength and deformation characteristics have changed, resulting in the existing surrounding rock control theory and technology can not adapt to the new situation in the deep, a large number of hard-to-support tunnels, directly af...

AI Technical Summary

Problems solved by technology

However, the research on the control technology of confining concrete with weak surrounding rocks for super-large-section tunnels is in its infancy at home and abroad, and there is no mature construction method suitable for constrained concrete support systems in China.

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