Novel modular temporary support assembly structure for loess tunnel with ultra-large cross section

Abstract

The invention relates to the technical field of tunnel construction support, in particular to a novel modular temporary support assembly structure for a loess tunnel with an ultra-large cross section. According to the novel modular temporary support assembly structure for the loess tunnel with the ultra-large cross section, field assembly operation is realized through I-shaped steel, special accessories, bolt connection and the like, reutilization of materials is achieved, and the use cost is greatly reduced. The novel modular temporary support assembly structure comprises vertical supports, annular supports and a temporary inverted arch, the vertical supports are detachably connected through door-shaped structures and tensioning structures, the vertical supports are detachably connected with the annular supports, and the two ends of the temporary inverted arch are detachably connected with the vertical supports and the annular supports.

Description

technical field [0001] The invention relates to the technical field of tunnel construction support, in particular to a novel modular temporary support assembly structure for super-large section loess tunnels. Background technique [0002] In the existing technology, construction methods such as double-side-wall pilot pits, CD, and CRD are suitable for tunnel construction with large spans, poor surrounding rock conditions, and high requirements for ground deformation control. Highway tunnels in Northwest China where collapsible loess is widely distributed widely used in construction. During the construction process, a large number of temporary supports are required to ensure the stability of the surrounding rock. The force of the temporary support system is complex, and the closure time of the entire section of the initial support is relatively long. Low. In order to effectively solve the above technical problems, an assembled temporary support structure is generally adopte...

AI Technical Summary

Problems solved by technology

[0003] At present, during tunnel construction, the temporary support is basically welded. The traditional welded steel frame system needs to be welded and fixed, and it is easy to cause heat and deformation of the steel frame. Deslag removal and antirust treatment, improper treatment, easy to oxidize and rust, affect the life of the steel frame

At the same time, the biggest defect of electric welding connection is that it is easy to produce false welding, causing the steel frame system to bury safety hazards

The construction site of electric welding is full of sparks, smog, and welding slag, which requires professional equipment and auxiliary equipment. The energy consumption is relatively large, and there is a fatal hidden danger of electric welding itself, namely fire.

The most important thing is that it is inconvenient to disassemble the material after welding and can only be cut, which leads to the inability of the material to be reused, resulting in a large amount of material waste and increased production costs

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