Construction method and support mould for tunnel primary support

Abstract

The invention provides a construction method and support mould for tunnel primary support. The movable support mould is adopted in tunnel primary support construction; a mould cavity is formed betweenthe support mould and the tunnel excavation face; the support mould moves with the outline of the tunnel excavation face as the moving track; the mould cavity used for forming a tunnel primary support concrete layer is formed through joint cooperation of the movable support mould and the tunnel excavation face; the mould cavity is filled with concrete added with an accelerator, and after the concrete at the bottom of the mould cavity is initially solidified, the support mould moves towards a next station step by step; when the support mould moves, a mould cavity which is newly formed by the support mould in the moving process and the tunnel excavation face is continuously filled with concrete added with an accelerator; and finally, the whole tunnel primary support concrete layer is formed. The construction method and support mould have the beneficial effects that the working time is short, efficiency is high, the using quantity of the accelerators is small, springback is avoided, flatness is high, smoothness is achieved, unevenness is avoided, attractiveness is achieved, and after-treatment is not needed.

Description

technical field [0001] The invention relates to the technical field of initial support for tunnel construction, in particular to a construction method for initial support of a tunnel and a support mold. Background technique [0002] When the mine method is used for underground excavation construction, the surrounding rock support is generally divided into primary support and secondary lining, and the secondary lining is generally a concrete or reinforced concrete structure. Before the secondary lining is applied, the support form immediately after excavation is called primary support. The primary support is the main load-bearing structure for the stability of the tunnel. It is a flexible structure closely attached to the surrounding rock and the main support means to control the deformation and relaxation of the surrounding rock. The secondary lining is when the deformation of the surrounding rock and the primary support are basically stable. Under construction, the primary...

AI Technical Summary

Problems solved by technology

However, in order to ensure that the concrete quickly forms an initial support layer on the inner surface of the tunnel, a large amount of accelerators are often added to the concrete. The accelerators not only cause health hazards to construction workers, but also easily cause workers to suffer from silicosis and other diseases. also cause environmental pollution

At the same time, spraying concrete directly on the tunnel and the anchor spraying net will also cause poor stiffness of the initial support, and even deformation and cracking of the initial support, especially in the broken surrounding rock section. , also recorded in the invention patent application document with application number 201610225659.6

[0004] During the concrete spraying process of the initial support layer of the tunnel, the rebound phenomenon of the concrete is particularly serious, and the rebound rate is about 10%-50%, resulting in a great waste of materials, and the surface is prone to concrete accumulation after spraying, and there are bumps and cracks. pit

As a result, the following process needs to deal with the excessively accumulated raised parts on the surface, resulting in a waste of labor costs. The name is "A Tunnel Primary Support Structure", and the utility model patent application file with the application number 201721035530.5 also has relevant records and explanations

Images