JPH053315U - Shock absorber for bridge - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a shock absorber for repair work which has a simple structure and does not require maintenance of the closed cylinder type shock absorber used together with bridge support. [Structure] As shown in FIG. 1, a silicone resin putty 6 having a dilatancy characteristic is enclosed in a cylinder 2 of a closed cylinder type shock absorber 1 used for a bridge, and a soft packing material 5 is attached to a pressure receiving surface of a piston 3. Further, by providing the orifice 4 on the piston, the shock absorber can be downsized, and the shock absorber is suitable for repair work of a small bridge or an existing bridge.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  This invention is an improvement of the shock absorber for bridge, especially the closed cylinder type shock absorber. It is about.

[0002]

[Prior art]

  Multi-span continuous bridge disperses horizontal force in the axial direction generated during earthquake to each pier. Is desirable.

[0003]   Therefore, a method of using a bearing and a damper together is known as one means. This The method is to allow the loose girder movement due to temperature changes to escape, and to move suddenly during an earthquake. In order to resist with a damper, the resistance due to the adhesive force of the viscous body The ones that are used and those that are caused by the flow resistance due to the orifice of the oil cylinder It is known.

[0004]

[Problems to be solved by the device]

  Among the above, the damper due to the adhesive force of the viscous body has a large box body and a new large bridge However, it is not suitable for repair work on small bridges and existing bridges.

[0005]   In addition, the oil damper has already been put into practical use and is commonly used in several bridges, but the structure Requires precision, is expensive, and requires maintenance such as oil inspection. Is not widely used.

[0006]   Furthermore, as is well known, the structure that uses high viscosity instead of oil is free maintenance. However, it is preferable that it absorbs the influence of viscosity due to temperature changes and the slight movement due to the flexure of girder loading. The current situation is that it has not been put into practical use due to problems such as the inability to collect it.

[0007]

[Means for Solving the Problems]   In order to solve the above-mentioned problems, the present invention is of a closed cylinder type used for bridges. In the shock absorber, a silicon resin type with dilatancy characteristics in the cylinder Enclose the putty and attach a soft packing material to the pressure receiving surface of the piston. It is a structure with an orifice on the stone.

[0008]

[Action]

  A silicone resin putty with dilatancy characteristics is enclosed in a closed cylinder. Therefore, the silicon putty in the cylinder is For slow movement, pass through the gap between the piston and the cylinder and the orifice. However, it resists the sudden movement of the girder during an earthquake like an elastic body, Fix Ston. The small movement of the piston due to the bending of the girder such as the passage of vehicles, The soft packing on the piston pressure receiving surface absorbs it.

[0009]   At this time, the soft packing attached to the pressure receiving surface of the piston is compressed, so this pressure Only the reduction amount allows the movement.

[0010]

【Example】

  An embodiment of the bridge shock absorber of the present invention will be described with reference to the drawings. In FIG. A shock absorber 1 is provided with an orifice 4 on a piston 3 in a cylinder 2. Again piss A soft packing material 5 is provided on the pressure receiving surface of the tongue 3 and the tongue 3 has a duck inside the cylinder 2. If the ilantancy characteristic, that is, when a small force is gradually applied, normal liquid It has almost the same fluidity as the body, but also has high elastic properties, while applying sudden force. A silicone resin that has a behavior that is almost solid when it is crossed. Fill the putty 6 of the system.

[0011]   The silicon-based putty is used for the connecting fitting 8 that supports one end 7a of the piston rod 7. 6 is provided with an inlet 9 and an inlet plug 9a, while the other end of the piston rod 7 is provided. Between the end 10a of the connecting metal fitting 10 supporting the portion 7b and the base end 2a of the cylinder 2, a jar is provided. The loose 11 is provided, and dust is invaded by the dust seal packing 12 of the cylinder 2. Prevent.

[0012]   In the figure, 13 is a bearing and 14 is a packing.

[0014]   Next, an example of using the thus constructed bridge shock absorber 1 for repair work of an existing bridge explain about.   As shown in Fig. 2, a fixed bearing 16 and a movable bearing 17 are provided on the pier 15, and these bearings are used. Therefore, while supporting the bridge girders 18 and 19, the expansion joint 20 is provided in the gap between the bridge girders 18 and 19. In the bridge provided with, when the expansion joint 20 fails, the fixed bearing 16 Was replaced with a movable bearing 17, the expansion joint was removed, and the girder gap was closed. The horizontal force supported by the fixed bearing 16 is reduced by installing the impact device. The impulse device 1 acts as a substitute.

[0015]   In addition, FIG. 4 shows that the rubber girders 21 are loosely supported to suppress the lift of the bridge girders 22. It shows an example in which the impact device 1 is provided.

[0016]   Fig. 5 shows the structure in which the horizontal force of the bridge pier is dispersed by the rubber bearing 21 to assist the cushioning. 1 shows an example in which the device 1 is attached.

[0017]

[Effect of device]

  The bridge shock absorber of this invention has a closed cylinder and a piston as an oil damper. Since it does not require high precision such as, the processing cost is lower than that of oil dampers. Since there is no leak of silicon putty, no maintenance is required. Silicon putty has little change in viscosity and dilatancy characteristics with temperature, The change over time is small. Therefore, the function of the damper can be maintained for a long time. come.

[0018]   By absorbing the flexure of the packing on the piston pressure receiving surface, it is possible to absorb the slight movements caused by the flexure of the girder. Rukoto can.

[0019]   The silicon putty in the cylinder is It flows through the gap between the ton and the cylinder and the orifice, but It resists sudden movement like an elastic body and fixes the piston. However, the fixie Since the soft packing attached to the pressure receiving surface of the engine is compressed, it can be moved by bending the girder. On the other hand, only this compression amount allows the movement.   Since the damper is used together with the movable bearing, it is possible to allow movement due to bending of the girder. It is important in reducing the stress that acts on. The structure is simple and it is advantageous to manufacture a small capacity, and it is possible to provide dampers for repair work. Noh.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a shock absorber for a bridge according to the present invention.

FIG. 2 is a view showing an existing bridge supported by a fixed bearing and a movable bearing.

FIG. 3 is a view showing a state in which the shock absorber of the present invention is attached to the existing bridge shown in FIG.

FIG. 4 is a view showing a state in which the shock absorber of the present invention is attached to an existing bridge supported by this support.

FIG. 5 is a view showing a state in which the shock absorber of the present invention is attached to another existing bridge supported by a rubber bearing.

[Explanation of symbols]

1 Bridge shock absorber 2 cylinders 3 pistons 4 Orihuis 5 Soft packing material 6 Silicon putty with dilatancy characteristics 8, 10 connection fittings

Claims (2)

[Scope of utility model registration request] 1. A closed cylinder type shock absorber used for a bridge, characterized in that a silicone-based resin putty having dilatancy characteristics is enclosed in the cylinder, and a soft packing material is attached to the pressure receiving surface of the piston. Shock absorber for bridge. 2. The shock absorber for a bridge according to claim 1, wherein the piston is provided with an orifice.