Self-resetting energy dissipation device for shield tunnel shock absorption

Abstract

The invention belongs to the field of shield tunnel shock absorption, and particularly discloses a self-resetting energy dissipation device for shield tunnel shock absorption. The device comprises steel core outer rings, waterproof gaskets, rubber gaskets and shape memory alloy rings, wherein the inner sides of the steel core outer rings are provided with inclination angles, and the outer sides ofthe steel core outer rings are provided with grooves; the waterproof gaskets are fixed in the grooves in the outer sides of the steel core outer rings, and the rubber gaskets attach to the outer sides of the waterproof gaskets and the steel core outer rings; the shape memory alloy rings are installed between the two steel core outer rings, and the surfaces of the shape memory alloy rings attach to the inclination angles at the inner sides of the steel core outer rings; and when external force is applied, the distance between the two steel core outer rings is compressed, the shape memory alloyrings deform due to extrusion of the steel core outer rings, expand outwards and generate restoring force at the same time, so that energy is dissipated, and the structure of the device is enabled toreset. The device has a good buffering effect, can dissipate energy, can also provide the restoring force, and plays a role in self-resetting after an earthquake, and thus the maintenance and replacement cost of a tunnel is reduced.

Description

technical field [0001] The invention belongs to the field of shock absorption of shield tunnels, and more particularly relates to a self-resetting energy consumption device for shock absorption of shield tunnels. Background technique [0002] At present, most urban underground rail transit adopts the underground structure form of shield tunnel, and the seismic performance of shield tunnel directly affects the safety of urban traffic. The shield tunnel is composed of many segments and bolts connected to each other, and the segment joint is its weak link. The performance of the joint determines the overall stiffness and deformation capacity of the shield tunnel, and plays a key role in the waterproofing of the structure. [0003] The main manifestations of shield tunnel earthquake damage are segment cracking, platform dislocation, water leakage and joint damage. The rigidity of the connecting bolts is low, and it is easy to cause stress concentration and serious deformation u...

AI Technical Summary

Problems solved by technology

For example, the patent CN 110107577 A provides a shock-absorbing and energy-dissipating device for shield tunnel bolt joints. The device has the following disadvantages: 1. The design uses rubber washers and ordinary springs as shock-absorbing elements, which only play a buffering role during earthquakes. The energy dissipation effect is very small; 2. When an earthquake occurs, the compression deformation of the rubber gasket is limited, which reduces the buffering effect to a certain extent. The deformation of the spring depends on the total deformation of the rubber gasket to achieve the corresponding effect, and the effect is limited. ; 3. The device does not have the self-resetting function after the earthquake

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