KR200316028Y1 - Vibration Damping Device of Cable Stayed Bridge - Google Patents

Abstract

In the present design, suspension bridges and cable-stayed bridges are widely used in the construction methods due to the long span of bridges, but especially cable-stayed bridges have relatively low rigidity that supports upper girders (tops) with cables. This is a big problem to suppress cable vibration and improve the safety and durability of cable-stayed bridge cables.

Description

Vibration Damping Device of Cable Stayed Bridge

Since the cable-stayed bridge is a structure with low rigidity, the wind tunnel test of the girder is conducted and the dynamic wind safety is examined in detail.However, due to the long span of the bridge, the vibration of the cable itself caused by the wind is also a big problem, and the countermeasures are further considered. being.

The cause of vibration is academically reported to be caused by the following three phenomena.

First, when the wind passes through the cable and vortices occur, the frequency of this vortex coincides with the cable's natural frequency.

Secondly, when the wind accompanied by rain, two channels are formed on the upper and lower sides of the cable, resulting in rain vibration, which occurs when the cable cross section forms an aerodynamically unstable cross section.

Third, when the cables are arranged in parallel, it is known that the wind flow through the front cable causes vibration by Wave Gallopping, which causes the rear cable to vibrate.

Therefore, the present invention is a device for suppressing the vibration that is inevitably generated in the cable-stayed bridge cable, is easy to disassemble and assemble, and maximizes the vibration absorption and suppression effect, it can be easily installed and installed on the new bridge and cable-stayed cable Vibration suppression device of cable-stayed bridge cable designed to

When the bridge is long spanned or passes through rugged areas with deep valleys, deep seas or rivers, especially the cable-stayed bridge method is adopted, and the construction of the bridge is supported by cables connected to the main tower. In the case of the bridge of the cable-stayed bridge method, if the vibration generated in the cable by rain, wind or traffic vehicle is not adequately suppressed, this may lead to a large accident in which the fatigue load is accumulated at the cable connection part and the cable is cut.

As a result, a device for absorbing and suppressing vibration generated in the cable-stayed bridge cable has been developed and applied in part, but most of them are made of rubber pads (PADs), which are relatively small in vibration absorption capacity and have a vibration amplitude. This has a small drawback.

The present invention solves the conventional problems described above, as well as easy to install and install, and the device is designed to effectively perform the vibration suppression of the cable-stayed bridge cable, which is an essential purpose with the easy advantages of inspection and maintenance, the present invention is a conventional The damping device filled with a special fluid (Silicon Putty), which is fundamentally different from the PAD type vibration damping device that uses rubber, has a radial arrangement in the axial direction of the cable. It is a structure that absorbs and attenuates, and a damper using a silicon putty is a useful device having a large force and amplitude that can accommodate the generated vibration.

Figure 1 Cable-stayed Bridge

2 is a schematic diagram of a vibration suppression device installed on a cable-stayed bridge cable

Fig. 3 vibration suppression apparatus of the present invention using a fluid damper installed in the axial direction of the cable

Figure 4 Detailed view of the inside of the fluid damper

Explanation of symbols for the main parts of the drawings: Main Tower or: Bridge Top: Cable Lay: Cable Damper

1: cable-stayed bridge

2a: Upper clamp 2b: Lower clamp 2c: Rubber packing 2d: Tightening bolt hole

3a: Damper fixing bracket (frame side) 3b; Damper fixing bracket (clamp side)

4a: Upper frame 4b: Lower frame 4c: Tightening bolt hole

5: Damper

6: Holding column 6a: Anchor bolt hole

7: Base Plate

A: Mounting hole (frame side) A ': Mounting hole (clamp side)

B: Housing

C: Piston

D: cylinder

E: Seal

F: Piston Rod

G: filler

Hereinafter, the present invention will be described with reference to the accompanying drawings.

Figure 3 is a representative view of the present invention as shown in the following description of the combination installed on the cable,

There are clamps 2a and 2b which are fastened to the cable around the cable 1, and are fastened with bolts using the fastening bolt holes 2d while the rubber packing 2c is inserted therebetween.

The clamps 2a and 2b are again connected to the fixed frames 4a and 4b using damper fixing brackets 3a and 3b. The damping device 5 is inserted therebetween, and the lower frames 4b of the fixed frames are assembled. It is welded integrally with the support post 6 and the bottom fixing plate 7.

Therefore, the upper frame 4a is fastened and assembled by bolting through the fastening bolt hole 4c to the lower frame 4b, and is finally fixed to the upper plate of the bridge.

In addition, the detailed structure of the damping device (5) is specified in Figure 4, the piston rod (F) and the piston (C) integrated into the closed cylinder (D) is inserted, the interior space of the filler (G) Filled, the sealing material (E) for preventing the outflow to the outside is assembled and installed.

The housing (B) is assembled and installed between the clamps (2a, 2b) and the frame (4a, 4b) of the vibration suppression device for mounting the damping device and to prevent external interference during operation of the piston rod (F). will be.

As described above, when the cable-stayed bridge is pre-installed using the device of the present invention, the cable-stayed bridge is a vibration suppression device designed to be easily installed on the bridge deck due to the structure that is easily attached and detached in the field. Bridge construction

It is a device that has very useful and effective functions because it can not only increase safety and economic efficiency when using bridges, but also greatly increase the durability of cables in the future.

Claims (1)

It is a vibration suppression device for cable-stayed bridge cable using a damping device by filling a piston and a cylinder and filling a special fluid into it. There are clamps 2a and 2b which are fastened to the cable around the cable 1 and the rubber packing 2c is inserted therebetween, and they are fastened by bolts using the fastening bolt holes 2d and clamps 2a. 2b is connected to the fixing frames 4a and 4b again using damper fixing brackets 3a and 3b, and a plurality of damping devices 5 are inserted into the cable and axially radially inserted around the cable. The lower frame 4b of the fixed frame is welded integrally with the support 6 and the bottom fixing plate 7, and the entire structure is a cable-stayed bridge cable finally fixed to the upper plate of the bridge through the support and the bottom fixing plate. Damping device for cable-stayed bridges designed to effectively suppress vibrations.