Tunnel construction method based on steel tube arch-rib supporting structure

Abstract

The invention discloses a tunnel construction method based on a steel tube arch-rib supporting structure, which solves the problem that under a soft rock condition, a large-span and large-section tunnel is safely and quickly constructed. The tunnel construction method comprises the main processing steps of: forming a steel tube concrete arch-rib type supporting structure; and under the protectionof the supporting structure, tunneling a main tunnel on a complete section, and finally, forming a secondary lining structure. In the technology of the invention, by introducing steel tube concrete, the strong support is realized by low cost; and being different from the traditional advanced supports, such as a pipe roof, and the like which mainly give priority to a longitudinal direction, the steel tube concrete arch-rib type supporting structure mainly gives priority to a circumferential direction with poorer stress; in the construction process of an steel tube arch, a plurality of operation surfaces of longitudinal and transverse guiding holes are constructed in parallel with high speed and short work time; after the steel tube arch is completely constructed, a large-size digger is adopted to operate, which greatly increases construction speed and operation freedom degrees; and otherwise, the steel tube arch can be used as a casual support or a permanent support so that materials are not wasted and the construction cost of the large-span and large-section tunnel is saved.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to the construction technology of large-span and large-section tunnels. Background technique [0002] With the development of highways and high-speed railways, the excavation section of traffic tunnels is getting larger and larger. At present, four-lane or four-lane single-hole tunnels have appeared, with an excavation span of more than 20m and an excavation area of ​​200m 2 above. How to realize the rapid and safe construction of large-span and large-section tunnels in weak surrounding rock is an important issue to be solved urgently. In order to reduce the deformation of the surrounding rock and control the stability of the surrounding rock, according to the quality of the surrounding rock, the current excavation methods for ultra-large-section tunnels mainly include the step method, CD method, CRD method, ring excavation reserved core soil method, and double side wall guide me...

AI Technical Summary

Problems solved by technology

Although this method overcomes the shortcomings of construction interference and slow construction progress caused by partial excavation, the long anchor cables driven into the tunnel face are only used as temporary support measures and cannot be reused, resulting in waste of materials

[0004] In addition, some recent new construction methods, such as pre-lining method and shield-assisted method (shield arch excavation method, ring excavation method composed of multiple shields, etc.), cannot be widely used due to the high cost of construction equipment. use

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