Pier top embedded part, eccentric force transmission part and cantilever type anti-falling beam limiting device

Abstract

The invention discloses a pier top embedded part, an eccentric force transmission part and a cantilever type anti-falling beam limiting device. The pier top embedded part comprises an embedded plate,a force transmission cylinder is arranged on the embedded plate, a first eccentric block is arranged in an inner cavity of the force transmission cylinder, a through hole is formed in the first eccentric block, and the axis of the through hole and the axis of the force transmission cylinder are eccentric; the eccentric force transmission part comprises a force transmission cup body and a loading ring, the bottom surface of the force transmission cup body is provided with a second eccentric block used for being inserted into the through hole in the first eccentric block, and the loading ring isinserted into an inner cavity of the force transmission cup body; the cantilever type anti-falling beam limiting device comprises a beam bottom embedded sleeve assembly, a pier top embedded part, aneccentric force transmission part connected to the pier top embedded part and a limiting tenon elastically installed between the beam bottom embedded sleeve assembly and a loading ring of the eccentric force transmission part, and the beam bottom embedded sleeve assembly is embedded in beam bottom plate concrete. The pier top embedded part is embedded in the surface of pier top concrete. The invention is simple in structural design, installation of the limiting tenon can be smoothly achieved, shock absorption, isolation and limiting effects on an earthquake can be achieved in the using process, and the beam falling prevention capacity can be improved.

Description

technical field [0001] The invention relates to the technical field of bridge vibration reduction and isolation, in particular to a pier top embedded part, an eccentric force transmission part and a cantilever type anti-falling beam limiting device. Background technique [0002] Beam drop during an earthquake is one of the main forms of bridge earthquake damage. Falling beams will cause great damage to the bridge structure, and it is extremely difficult to repair after the earthquake. Therefore, in the seismic design of bridges, preventing earthquake falling beams is an important Very important subject. [0003] In the previous seismic design of bridges, a limit stop device was installed between the girder body and the bridge pier or abutment. When an earthquake occurs, when the support bolts are sheared, the limit stopper will limit the gap between the beam body and the abutment. The large displacement prevents the girder body from falling, and at the same time, the limit ...

AI Technical Summary

Problems solved by technology

When the gap is small, the temperature force of the beam body cannot be effectively released. When the gap is large, there will be a collision between the stopper and the supporting pad when the earthquake occurs, thereby affecting the function of the anti-fall beam;

[0006] (2) The block basically does not have the function of shock absorption and isolation during an earthquake, and the force deformation of the block cannot be accurately calculated, and the impact effect and damage are difficult to estimate;

[0007] (3) When the beam body is displaced, only the stopper on one side plays a role, and the stopper is an anisotropic component, and there is an obvious weak axis direction

Due to the current situation of off-site construction, it is difficult to align the positions of the upper and lower steel cylinders, which makes it difficult to install the limit steel tenon. Although the tenon-shaped anti-fall beam device is designed with an eccentric flange device, it is still difficult to adjust the eccentricity due to its small amount of eccentric adjustment. Meet the needs of limit steel tenon installation

Therefore, most of the current actual engineering construction adopts the construction method of burying the pre-embedded steel cylinder at the top of the pier after erecting the beam, which not only increases the construction process and construction difficulty, but also increases the construction cost

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