Inverted arch supporting assembly suitable for shield-type TBM tunnel prefabricated segmental lining structure

Abstract

The invention relates to an inverted arch supporting assembly suitable for a shield-type TBM tunnel prefabricated segmental lining structure. Under the precondition that the segment structural property is not weakened, the problem that a lining segment is separated out from the shield tail and then naturally sinks can be effectively solved, the ring formation quality of the segment is greatly improved; and meanwhile, mounting of the segment can further be facilitated, and the structural waterproof property can be ensured. The inverted arch supporting assembly comprises threaded sleeves and inverted arch supporting components; the threaded sleeved are arranged in a structure on the outer side of the prefabricated segment in an enveloped mode according to the assembly point position, the inverted arch supporting components are symmetrically mounted and arranged on the outer side of the lower portion of an inverted arch and provided with inverted arch supporting legs and supporting threaded rods, and the supporting threaded rods are detachably in spiral connection with the threaded sleeves.

Description

technical field [0001] The invention relates to tunnel engineering, in particular to an inverted arch support assembly suitable for the prefabricated segment lining structure of a shield type TBM tunnel. Background technique [0002] Rock tunnel boring machines (TBM) were widely used in hydraulic and railway tunnels in the early stage. With the vigorous development of urban rail transit projects, TBM construction methods are also used more and more in urban subway tunnels in rocky areas. Constrained by the special surrounding environment and complex geological conditions of urban subways, shield-type TBMs are generally used for construction. For example, single-shield TBMs are used for Chongqing rail transit, and double-shield TBMs are used for Qingdao rail transit; geological adaptation is generally used for lining structures. It is a prefabricated reinforced concrete segment lining structure with strong performance and rapid construction. [0003] Since the reinforced con...

AI Technical Summary

Problems solved by technology

Since the shield-type TBM has no shield tail sealing device, the gap between the outer diameter of the segment and the excavation diameter cannot be filled by synchronous grouting; therefore, when the segment comes out of the shield tail, the inverted arch segment will naturally sink to occupy the The gap between the outer diameter of the segment and the excavation diameter will cause the segment to be wrong and the ellipticity of the tunnel to exceed the standard, and it may also cause serious leakage of the tunnel segment in the later stage

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