Segmented integrated casting tunnel steel arch frame structure and supporting method thereof

Abstract

The invention provides a segmented integrated casting tunnel steel arch frame structure and a supporting method thereof. The structure is divided into a plurality of unit segments in the extending direction of an arch frame. The unit segments are integrated castings. The cross section of each unit segment is a regular rectangle. Each unit segment comprises a soil facing side stress rod, lateral shear supporting rods, a soil back side stress rod, stress rod connecting rods and segment connecting plates. The adjacent unit segments are installed through bolts penetrating through the two segment connecting plates to form the whole steel arch frame structure. The steel arch of the structure is prefabricated in a factory, steel is integrally cast and is good in integrity, the machining precisionis high, and quality is easy to guarantee. Meanwhile, the lateral shear supporting rods, the soil facing side stress rod and the soil back side stress rod are prefabricated into a whole, so that theshear performance is excellent, and the stress performance of the whole steel arch frame can be effectively guaranteed. Moreover, manual welding and grating steel frame machining in a traditional initial support field are avoided, the cutting loss of steel bars is reduced, the manufacturing cost is reduced, the construction period is shortened, and the structure is suitable for various types of subsurface tunnel construction needing initial support.

Description

technical field [0001] The invention relates to the technical field of tunnel arches, in particular to a segmented and integrated cast tunnel steel arch structure that can be used in the construction of underground excavation tunnels, and is suitable for the construction of various underground excavation tunnels that require primary support. Background technique [0002] With the continuous development of urban underground space, the construction of underground engineering is increasingly restricted by the above-ground environment and underground structures. Due to its relatively small impact on the surrounding environment and strong cross-section adaptability, the underground excavation method has gained more and more attention. However, there are many problems in the traditional primary support and secondary lining construction of underground excavation tunnels. [0003] The common form of initial support for traditional underground excavation tunnels is the grid steel fra...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a segmented integrated cast tunnel steel arch structure and its support method, which solves the problem that the existing grid steel frame needs to be processed and manufactured at the construction site, the processing accuracy is difficult to guarantee, the adjustment and erection of workers is difficult, and the strength of the steel bar is low. The technical problems of serious losses, low construction speed and high safety risks, as well as the technical problems of high project cost caused by cumbersome construction, serious waste of steel materials and high labor costs

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