JPS5933727B2 - Shock absorbers used in structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to
The present invention relates to a shock absorbing device that alleviates so-called vehicle braking and starting loads as well as earthquake forces, and absorbs displacement of the superstructure due to temperature changes, creep caused by drying shrinkage of concrete, etc.

Conventionally, this type of shock absorber includes a casing 1 fixed to a lower structure B such as a bridge pier, a rod-shaped body 2 fixed at one end to an upper structure G such as a bridge girder, etc., as shown in FIGS. 1 and 2. The ends are inserted so as to form a large gap 3, 3 in one direction and a small gap 4.4 in the other orthogonal direction, and the gap 3 is formed by the rod-shaped body 2 and the casing 1.
, 4 are filled with a viscous material 5, and the rod-shaped body 2 fills the gaps 3, 3.
The viscous body 5 closes the gap 4 by moving to either of the gaps 4 and 4.
.

However, depending on the installation method (or condition) of the structure, there was a problem in that the impact force acting on the bridge could only be buffered in one direction, either in the direction of the bridge axis or in the direction perpendicular to the bridge axis. .

Various studies have been made to solve these problems. For example, in Japanese Patent Publication No. 52-34137, an inner box was disposed inside the casing, the pair of parallel sides of which abut against the inner wall of the casing to provide a buffering effect in only one direction. and a rod-like body is mounted in the inner box so that a pair of parallel side surfaces of the rod-like body abut against an inner wall of the inner box located in the direction of the buffering effect to obtain a buffering effect in a direction perpendicular to the direction. provided a shock absorbing device for the

However, although this shock absorbing device satisfies the function of providing a shock absorbing effect both in the direction of the bridge axis and in the direction perpendicular to the bridge axis, the problem remains that it requires a large number of casings, inner boxes, rod-shaped bodies, and other components, and the structure is complicated. It had been.

That is, the contact surfaces between the casing and the inner box, and between the inner box and the rod-shaped body must be formed with grooves that form flow paths for the viscous material to provide a buffering effect. The inner box is normally assembled using welding, bolts, etc. using There are problems such as the complicated work involved in manufacturing the rods with improved dimensional accuracy so that each rod-shaped body can move smoothly.

The present invention has been made to solve these problems, and includes a shock absorber in which a rectangular rod-shaped body is inserted into a rectangular casing. By arranging a pair of pressing plates that are larger than the width of the casing and having a predetermined small gap from the inner wall of the casing, the pressing plates move together with the rod-shaped body in one direction, thereby reducing the gap between the pressing plates and the casing. A buffering effect is obtained by the flow resistance of the viscous material filled in the casing flowing through the gap, and in the other direction perpendicular to this direction, a rod-shaped body moves between a pair of pressing plates along the pressing plates, A shock absorber that obtains a shock absorbing effect by the flow resistance of a viscous material filled in the casing flowing through the gap between the press plate and the casing;
This provides a shock absorbing device that generates resistance in all directions.

In other words, a pair of pressing plates which are thicker than the width of the side surfaces (and whose ends have a predetermined small gap with the inner wall of the casing) are arranged on either of a pair of parallel side surfaces of the rod-shaped body, sandwiching the side surfaces, and The viscous material filled in the casing moves between the press plate and the inner wall of the casing as the rod-shaped body moves against both the axis and the direction perpendicular to the bridge axis, as well as against impact forces that act in all directions. The present invention provides a shock absorbing device for use in a structure that provides a smooth shock absorbing effect using flow resistance flowing through the gaps between the structures.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Reference numeral 10 denotes a casing having a rectangular cross-sectional shape, which is buried and fixed in a lower structure B such as a bridge pier, and the casing 10 has an opening 11 at one end, and a receiver is attached to the outer periphery of the opening 11. A sealing material 13 held at 12 is attached.

Note that the casing 10 has its opening 11 facing upward,
In addition, the receiver is embedded and fixed in the lower structure B such that the member 12 is located generally on the upper surface of the lower structure B.

Reference numeral 14 denotes a rod-shaped body having a rectangular cross-sectional shape and having one end fixed to the superstructure G such as a bridge girder, and the other end of the rod-shaped body 14 is inserted into the casing 10 so that it can move with the movement of the superstructure G. is inserted into the opening 11 of the casing.

15. 15 is a rod-shaped body 14 inserted into the casing 10
The protrusion 15 is provided on the lower end 14' of the rod-shaped body 14, and the protrusion 15 is attached to a pair of side surfaces parallel to the bridge axis direction (Y-Y direction in the figure) of the rod-shaped body 14 in the bridge axis direction (X-Y direction in the figure). It is provided so as to protrude in the X direction).

Reference numeral 16.16 denotes a pair of pressing plates that are configured to face each other in parallel by a connecting piece 17.17, and the pressing plates 16,1
6 is fitted into the rod-shaped body 14 and placed in the casing 10 with one end in contact with the convex portions 15, 15 of the rod-shaped body 14 so as to work together with the rod-shaped body 14 in one direction, so-called bridge axis direction. and are arranged so as to face each other.

The pressing plates 16, 16 are larger than the width of the opposing side surfaces of the rod-shaped body 140, and are formed in such a size that they have a predetermined small gap C between them and the inner wall of the casing 10.

1B and 1B are protrusions provided on both ends of the press plates 16 and 160, and the protrusions 1B and 18 abut against the inner wall of the casing 10 and close the gap between the press plate 16 and the casing 10 by the movement of the rod-like body 14. C is always kept constant and a smooth buffering effect can be obtained.

19.19 is a pressing plate 16.16 provided on the rod-shaped body 14
The floating preventing portions 19, 19 are formed by protruding portions 15, 15 so as to cover the upper ends of the pressing plates 16, 16.
The convex portions 15, 15 are formed on the side surfaces provided with the convex portions 15, 15 to prevent the pressing plate 16°16 from rising as the rod-shaped body 14 moves.
This is to prevent this by holding it in place.

20 is a viscous material filled in the casing 10;
1 is a lid placed on the rod-shaped body 14, and the lid 21 is attached to the rod-shaped body 1.
Even if the casing 4 moves, it is always provided in sliding contact with the sealing material 13 of the casing to prevent foreign matter from entering the casing 10.

Here, since the load of the superstructure G such as the bridge girder is supported by a separately installed support device (not shown),
The load does not act on the shock absorber, and the casing 1
Since the rod-shaped body 14 fitted into the upper structure G is always maintained at a constant distance from the bottom of the casing 10 by the support device, the subordinate load acting on the upper structure G is smoothly transferred to the bottom of the casing 10.
This can be transmitted to the viscous body 20 filled in the inside.

In the shock absorbing device of the present invention, by disposing a pair of pressing plates 16, 16 fixed to a rod-shaped body 14 by a connecting piece 17, the rod-shaped body 14 is moved in the bridge axis direction (X in the figure) by the action of a dependent load. -X direction (see Figure 4),
The pressing plates 16, 16 move in the direction together with the rod-shaped body 14, and as a result of this movement, the viscous body 20 filled in the casing 10 is moved between both ends of the pressing plates 16, 16 and the casing 10.
The material flows through a gap C formed between the inner wall of the body as shown by arrow a in the figure, and the flow resistance force generated when flowing through the gap C absorbs and relieves the load.

In addition, the subordinate load acting in the direction perpendicular to the bridge axis (Y-Y direction in the figure, see Figure 4) causes the rod-shaped body 14 to move in that direction, that is, the rod-shaped body 14 moves between the pressing plates 16 and 16. 1
The viscous material 2 filled in the casing 10 is
0 flows through the gap C formed between both ends of the press plate 16.16 and the inner wall of the casing 10 as shown by the arrow d in the figure.
The flow resistance force when flowing through the gap C absorbs and relieves the load.

In this way, the rod-shaped body 14 inserted into the casing 10
By arranging a pair of pressing plates 16, 16 in the casing 10, the pressing plates 16, 16 move together with the rod-shaped body 14, or the rod-shaped body 14 moves between the pressing plates 16, 16, thereby filling the inside of the casing 10. Flow viscous resistance is generated in the viscous body 20, and this resistance always provides a reliable buffering effect in all directions.

In addition, in this embodiment diagram, the direction perpendicular to the bridge axis of the rod-shaped body 14 (Y-
A convex portion 15.15 on which the pressing plates 16, 16 are placed is formed at the lower end portions 14', 14' of the pair of side surfaces parallel to the Y direction), and the pressing plates 16. Although it was made to move in the axial direction (X-X direction), the lower end portions 14' of the pair of side surfaces parallel to the bridge axis direction (X-X direction (2),
It is also possible to adopt an embodiment in which a convex portion 15.15 is provided on 14' so that the pressing plate 16.16 can move together with the rod-shaped body 14 in a direction perpendicular to the bridge axis (Y-Y direction).

FIGS. 6 to 8 show shock absorbers of other embodiments.

That is, in this embodiment, concave grooves 22, 22 are provided at the bottom of the casing 10 along the bridge axis direction, and the rod-shaped body 14 is provided in the bottom part of the casing 10.
The pressing plate 16° 16 that can move with the grooves 22, 2
2, and by the movement of the rod-like body 14, the gap C between both ends of the pressing plates 16, 16 and the inner wall of the casing 10 is formed between the concave grooves 22, 22 and the legs 23, 2.
By engaging 3, it is always kept constant.

In this embodiment as well, the same effects as those described in the embodiments shown in FIGS. 3 to 5 can be obtained.

In addition, in the embodiment diagram, there is a groove 22 at the bottom of the casing 10.
, 22 were provided along the bridge axis direction, but the grooves 22, 22
It is also possible to adopt a mode in which the pressure plates 16 are provided not along the bridge axis direction but along the direction perpendicular to the bridge axis, and in such a case, the pressing plates 16, 16 are arranged so as to be movable together with the rod-shaped body 14 in this direction.

In this embodiment, in order to make the pair of pressing plates 16, 16 face each other in parallel, a mode is shown in which both ends thereof are locked by connecting pieces 17°17. Various means can be used without using the connecting pieces 17, 17, and are not limited to this embodiment.

The present invention has the above-mentioned configuration, and has a simple structure in which a pair of pressing plates are arranged on a rod-shaped body that is inserted into a casing, and a reliable buffering effect can always be obtained in all directions.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a conventional shock absorber, and Fig. 2 is a longitudinal sectional view showing a conventional shock absorber.
1, FIG. 3 is a vertical sectional view showing the shock absorber of the present invention, and FIG. 4 is a sectional view taken along line F--
5 is a perspective view showing the pressing plate in FIG. 3, FIG. 6 is a vertical sectional view showing a shock absorber of another embodiment, and FIG. 7 is a perspective view showing the pressure plate in FIG. The H-line sectional view and FIG. 8 are perspective views showing the pressing plate in FIG. 7. 10: Casing, 14: Rod-shaped body, 15: Convex portion, 16:
Pressing plate, 20: viscous body.

Claims (1)

[Claims] 1 In a casing that is fixed to a lower structure such as a bridge pier and has a rectangular cross-sectional shape and has an opening at one end,
The other end of a rod-shaped body having a rectangular cross-sectional shape, one end of which is fixed to a superstructure such as a bridge girder, is inserted through the opening with a gap that allows movement within the casing in the direction of the bridge axis and perpendicular to the bridge axis. , and in a shock absorbing device in which the casing is filled with a viscous material, a rod-like body inserted into the casing is sandwiched between one of a pair of parallel side surfaces, and has a width larger than the width of the side surfaces. (, and a pair of pressing plates whose both ends have a predetermined small gap with the inner wall of the casing are disposed, and the rod-shaped body is inside the casing together with the pressing plates in one direction, and in the other direction perpendicular to the said direction. A shock absorbing device for use in a structure, characterized in that by moving between the pressing plates, a viscous flow resistance is generated and a shock absorbing effect is exerted against movement both in the bridge axis and in the direction perpendicular to the bridge axis.