Longitudinal anti-seismic joint of shield tunnel segment

Abstract

The invention discloses a longitudinal anti-seismic joint of a shield tunnel segment, and belongs to the technical field of shield tunnel segment lining joints. Comprising a threaded sleeve prefabricated in a concrete segment a, a screw is in threaded connection with the threaded sleeve, the screw is sleeved with a rubber ball sleeve, a rubber gasket is arranged at the end of the screw, a steel washer a is attached to the rubber gasket, a steel washer b and the steel washer a are oppositely arranged, and the two ends of an elastic device are connected with the steel washer b and the steel washer a respectively. The fastening nut is in threaded connection with the screw rod and is attached to the steel washer b, and the locking nut is in threaded connection with the screw rod and is in contact with the fastening nut. The method has the beneficial effects that the number of hand holes formed in the concrete duct piece is reduced, the bolt fastening operation time of technicians is shortened, and the existing shield technology and equipment can be applied and implemented more easily.

Description

technical field [0001] The invention relates to a longitudinal anti-seismic joint of a shield tunnel segment, belonging to the technical field of shield tunnel segment lining joints. Background technique [0002] The shield tunneling method has the characteristics of environmental protection, safety and high efficiency. The design process and construction method of shield tunneling have been gradually improved, but some problems have also been exposed in the process of construction and operation. Shield tunnel segments are made of prefabricated segments. In the field splicing method, when the tunnel structure passes through poor geology, the longitudinal segment connecting bolts may be partially damaged due to the deformation between the linings or the action of seismic loads. [0003] The segment joint of shield tunnel is the weak link of the lining pipe ring structure, and the form of joint bolts has gradually changed from curved bolts, straight bolts, and now commonly use...

AI Technical Summary

Problems solved by technology

When the adjacent lining rings are stretched or misaligned with the deformation of the formation, the longitudinal connecting bolts are often broken or sheared by the concrete segments and the concrete segments are partially damaged

The above problems not only reduce the safety of the structure itself, but also cause serious water leakage problems in the shield tunnel due to further misalignment of the waterstop or insufficient extrusion force

[0004] The curved bolt or straight bolt joints of the existing shield tunnel segment lining need to open grooves on the outer surface of the butt joint segment to form hand holes, and reduce the cross-sectional size of the concrete segment, while the inclined bolt only connects the single segment. Grooves are made on the outer surface of the side to form hand holes. The existing joints have limited shear and tensile deformation capabilities, which may easily cause damage to joint bolts and lining structures during earthquakes. The seismic capacity of the longitudinal joint joints of shield tunnels needs to be improved.

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