Membrane bag concrete and corrugated steel plate combined tunnel preliminary bracing structure

Abstract

The invention belongs to the technical field of tunnel supporting, and particularly relates to a film bag concrete and corrugated steel plate combined tunnel primary supporting structure which comprises a corrugated steel plate body and a film bag body. Connecting plates are welded to the two ends of each corrugated steel plate body, a plurality of fixing holes are formed in the connecting plates, every two adjacent corrugated steel plate bodies are fixed together through the corresponding connecting plate and spliced into an arch-shaped supporting plate, a film bag body is laid on the outer arc-shaped surface of each supporting plate, and the film bag bodies are laid along the inner concave faces of the outer surfaces of the corrugated steel plate bodies. The film bag body is filled with concrete; after the concrete in the film bag body is dried, the size is expanded and enlarged again, the sealing performance of the port of the pouring area is enhanced, construction operation is convenient, concrete screen pouring is conducted in the pouring area, the mortar overflow amount is reduced, and materials are saved; and meanwhile, the film bag body and the undried concrete are both flexible bodies and expand and support in accordance with the shape in the pouring area, so that the device is suitable for soft soil, expansive soil, collapsible soil and other areas with low foundation bearing capacity.

Description

technical field [0001] The invention belongs to the technical field of tunnel support, in particular to a tunnel initial support structure combined with a membrane bag concrete and a corrugated steel plate. Background technique [0002] After tunnel excavation, in order to control the proper release and deformation of surrounding rock stress, increase structural safety and facilitate construction, immediately after tunnel excavation, the structural layer with less rigidity and as a permanent bearing structure is called initial support. [0003] Existing tunnel excavation support generally uses corrugated steel plate. The biggest feature of corrugated steel plate is that the virtual thickness of the steel plate can be increased through the setting of the waveform, so that its buckling resistance and shear resistance can be significantly improved. Therefore, as a building material of corrugated steel plate, it is also gradually applied in the fields of transportation facilitie...

AI Technical Summary

Problems solved by technology

[0004] When the corrugated steel plate is used to support and protect the earth against rock stress, concrete is sprayed outside the arched support structure formed by splicing corrugated steel plates. Due to the support of a single corrugated steel plate, the opening of the pouring area between the support structure and the soil is If there are gaps left, the concrete is easy to overflow when spraying and pouring concrete, which affects the overall support strength and sealing performance of the pouring area, and also causes waste of concrete materials, and the concrete is directly in contact with the corrugated steel plate, and the concrete adheres to the corrugated steel plate. on the steel plate, so that the removal of the corrugated steel plate in the later stage is more airtight. In severe cases, the corrugated steel plate is damaged and cannot be used again, resulting in a waste of building materials

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