Anti-seismic pressure-limiting anchor rod head

Abstract

The invention belongs to the technical field of anchorage, and specifically relates to an anti-seismic pressure-limiting anchor rod head. An annular hydraulic cylinder coaxially sleeves on an anchor rod, and the anchor rod is connected with a mounting wall; the inner part of the annular hydraulic cylinder is sequentially divided into a first annular cavity and a second annular cavity from inside to outside by an annular baffle; a first annular piston is arranged in the first annular cavity, and a second annular piston is arranged in the second annular cavity; the first annular piston is connected to one end of each piston connecting rod, and the other end of each piston connecting rod extends out of the annular hydraulic cylinder; the second annular piston is connected with one end, away from the mounting wall, of the second annular cavity through a damping spring; the end, deviated from the piston connecting rod, of the first annular cavity is connected with the end, deviated from thedamping spring, of the second annular cavity; and a constant pressure valve is mounted on the side, deviated from the damping spring, of the second annular cavity. According to the anti-seismic pressure-limiting anchor rod head, anti-seismic damping is generated by viscous liquid flowing and deformation of the damping spring, and the constant pressure valve limits the maximum anchoring force to prevent the anchor head from being damaged by impact load exceeding the anchor rod bearing capacity.

Description

technical field [0001] The invention belongs to the technical field of anchor rods and anchor heads, and in particular relates to an anti-seismic pressure-limiting anchor rod and anchor head. Background technique [0002] With the rapid development of highway and railway construction in our country, engineering construction in high-intensity areas puts forward new requirements for the seismic resistance of anchorage engineering. Practice has proved that when earthquakes occur, the damage of anchorage engineering mainly occurs at the anchor head. In the prior art, only springs are added under the anchor head plate to reduce the impact force of the earthquake (referred to as spring anti-seismic anchor). Due to the large anchoring force, the stiffness of the spring is large, the deformation is limited, and the cushioning capacity of the anchor is limited. When When the impact load exceeds the bearing capacity of the anchor, the anchor head will still be damaged, which cannot fu...

AI Technical Summary

Problems solved by technology

The common disadvantage of the rod body pressure anchor is that the anchoring force changes nonlinearly with the deformation of the rod body, and the ultimate pulling amount is a limited value, which is expensive, requires high installation requirements, and cannot be reused.

[0006] When the yielding structure of these two types of yielding anchors is deformed or displaced, the anchoring force changes and has a nonlinear relationship, which is difficult to quantitatively analyze; the deformation or displacement of the yielding structure is limited, and the anchor head yielding structure requires Increase the allowable deformation by replacing the relief ring multiple times; the cost of the pressure relief structure of the rod body is high, and the installation requirements are high; it cannot be reused

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