External stay cable type damping device

Abstract

The invention discloses an external stay cable type damping device. The device comprises a stay cable, a cable hoop, bolt connecting pieces, dampers, an upper bracket, a pipe hoop, a supporting frame, a diagonal bracing pipe and a box girder top surface, wherein the cable hoop is fixedly sleeved on a stay cable PE (Polyethylene) external protecting pipe through the bolt connecting pieces; two single earrings are arranged on one side of the cable hoop close to the dampers; the single earrings of the cable hoop are connected with one ends of the dampers through pin shafts; the other ends of the dampers are connected with double earrings on the end part of the upper bracket through the pin shafts; the two dampers are symmetrically distributed to form an isosceles triangle with the upper bracket; the dampers are perpendicular to the central line of the stay cable; the middle part of the upper bracket is movably sleeved in the pipe hoop through the bolt connecting pieces of the pipe hoop; the pipe hoop is welded at the top end of the supporting frame; the diagonal bracing pipe is fixedly connected to the upper part of the supporting frame through the pin shaft; the bottom end of the diagonal bracing pipe, the bottom end of the supporting frame and the box girder top surface are fixedly welded to form a triangular supporting structure. The device has the advantages of simple structure and convenience in mounting and is suitable for stay cables of all angles.

Description

technical field [0001] The invention belongs to the technical field of bridge damping devices, and in particular relates to an external damping and damping device for a cable-stayed bridge that can suppress and reduce the vibration of the cables of a cable-stayed bridge. Background technique [0002] With the continuous development of modern bridge construction technology, the bridge span structure is developing towards the trend of tall, soft and low damping, and the development of ultra-long and 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 fat...

AI Technical Summary

Problems solved by technology

Disadvantages: 1. The structure of this type of vibration damping device is complicated, and there are many connection points between parts, and the accumulated motion gap is relatively large, which prolongs the response time of the vibration of the cable stay, which is helpful for suppressing the small vibration of the cable stay greater impact, and because the components are too complex, the workload of later maintenance will also increase

2. The damper of this type of device is indirectly connected to the stay cable through a lever. The vibration generated by the stay cable is in-plane and out-of-plane three-dimensional vibration. When the stay cable produces out-of-plane vibration, it drives the lever to rotate, even if the damper rotates, The energy dissipated by the rotation of the damper is not very significant, so the vibration damping effect is not very good

3. When the stay cable is longer, in order to improve the vibration damping effect of the cable, the installation height required for the damping device will also be raised accordingly. If this type of vibration damping is used, the lever will inevitably be lengthened, and the damping effect will be less obvious

Disadvantages: 1. Since only a single-axis damping device is installed, that is, only one damper is installed, the damping effect on vibrations in other directions outside the cable plane, especially in the direction perpendicular to the damper, is not obvious, because the vibration transmitted to the damper The axial displacement is obviously much smaller than the vibration displacement of the cable itself, which reduces the vibration of the cable and reduces the energy dissipation effect of the damper.

When the stay cables are long, the installation height of the vibration damping device is required to be relatively high, and when the cables are densely distributed, if this structure is used for installation, the bottom end of the rigid support will be affected by the adjacent stay cables, while can't install correctly

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