Prototype test device for shield tunnel dual-layer lining structure and secondary lining pouring device

Abstract

The invention discloses a prototype test device for a shield tunnel dual-layer lining structure. Two mudsills, two cross counter-force beams and a vertical counter-force beam form a test bed; two cross slip beams, two cross jacks, a vertical load transfer beam and two vertical jacks form a loading device; the both ends of the shield tunnel dual-layer lining structure formed by combining a duct piece lining and a secondary lining are respectively arranged on the stressed faces of the two cross slip beams; and the cross jacks and the vertical jacks respectively apply pressure to the duct piece lining and the secondary lining. The invention further discloses a pouring deice for the secondary lining, wherein two symmetrical connection lateral faces on a splicing module are in a splayed structure; and a concrete baffle is mounted at the outer side of an assembly of the splicing module and forms a pouring cavity. According to the invention, a dual-layer lining structure loading test can be realized at different stress states, a cracked duct piece lining and secondary lining reinforcing and supporting mechanical loading test is carried out, and the pouring of secondary linings with different sizes and different curvatures can be realized.

Description

technical field [0001] The invention relates to a prototype test device for a segment lining structure of a shield tunnel, in particular to a prototype test device for a double-layer lining structure of a shield tunnel including a segment lining and a secondary lining and a secondary lining pouring device. Background technique [0002] At present, the load-bearing structure of traffic shield tunnels at home and abroad generally uses single-layer fabricated segment lining as permanent support. However, with the increase of the service life of the shield tunnel, the lining of the segment will have problems such as lining ring misalignment, cracking of the segment concrete, and local water leakage in the tunnel, so that the mechanical properties of the shield tunnel lining structure will increase with the service life. The increase will cause damage and deterioration, which seriously threatens the durability and long-term safety of the tunnel lining structure. Under the situat...

AI Technical Summary

Problems solved by technology

In terms of test research on the mechanical properties of shield tunnel segment linings, there are currently two main types of mechanical test devices for prototype segment ring loading and horizontal model test devices based on similarity theory. The prototype test is too expensive to consider structural reinforcement. and secondary lining, etc., it is difficult to carry out practical application and promotion; the horizontal model test device based on similarity theory is too simplified, and there are problems such as the inability to simulate segmental lining joints and segment assembly.

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