External closed cylinder viscous shear damper for stay cables

Abstract

The invention relates to a damper, in particular to a viscous shear type damper with an external closed cylinder for a stay cable, and belongs to the technical field of stay cable dampers. It includes an inner insertion tube and an outer damping cylinder, the upper end of the outer damping cylinder is sealed and connected to a guide cover, the upper end of the inner insertion tube is connected to a guide rod, and the upper end of the guide rod passes through the guide cover, protrudes from the outer damping cylinder and is connected with double clevis. Two opposite magnetic steel sheets are arranged on the inner end surface of the inner insertion tube and the outer end surface of the inner damping cylinder, and the two opposite magnetic steel sheets have opposite magnetic properties. The present invention has a closed structure, the upper and lower connectors are equipped with guide and limit positions, and the internal cannula is filled with a polymer viscous damping fluid. It has a self-positioning function inside, and the installation hole distance will not shift during the process of transportation and installation, which improves the installation efficiency of the damper.

Description

technical field [0001] The invention relates to a damper, in particular to a viscous shear type damper with an external closed cylinder for a stay cable, and belongs to the technical field of stay cable dampers. Background technique [0002] With the continuous development of modern bridge-building technology, bridge span structures are developing toward tall, soft, and low-damping trends. The development of ultra-long, large-span flexible bridges is an international trend. The spans of the cable-stayed bridges built at home and abroad in recent years are increasing day by day, and the stay cables are also increasing day by day. Stayed cables are one of the main load-bearing components of cable-stayed bridges. Due to their small mass, high flexibility, and low internal damping, they are prone to vibrations under the excitation of the external environment. Continuous cable vibration will cause fatigue of the cables and anchor heads and damage to the protective layer, shorten...

AI Technical Summary

Problems solved by technology

[0004] 1. The existing viscous shear damper with external cable is generally an open structure, which cannot be completely isolated from the outside air only by the dust cover and the rubber dust plate, and the outside dust and water vapor can still invade, which will affect the damping device performance and service life

[0005] 2. The existing cable-mounted viscous shear damper box is mostly welded by steel plates into a rectangular shape, with large dimensions and heavy weight, making installation and maintenance quite inconvenient

And because there is no positioning and guiding measures for the upper and lower structures of the damper, the upper and lower damper boxes are in a free state, resulting in difficulty in positioning the damper box and jamming after installation

[0006] 3. When the existing cable-mounted viscous shear type damper is used for a cable with a large in-plane angle (≥45°), the damper box is required to be installed perpendicular to the cable, causing the damper box to If the inclination angle of the body is too large, that is, the angle with the horizontal plane is too small, the high viscosity damping medium inside the damper box will overflow. reduced, and the appearance cannot be unified

[0007] 4. The upper and lower structures of the existing cable external viscous shear damper are only connected by the damping medium, and the infinite structure may easily cause the damper to deviate from the center position during transportation and installation, which will affect the installation of the damper

[0008] 5. The existing external viscous shear damper for the cable is a single type installed in the surface of the cable. Since the internal damping position is far away from the cable, when the cable vibrates out of the plane, the damper will rotate out of the plane. effect, which weakens the out-of-plane vibration reduction effect of the damper

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