JPH0978529A - Control device built-in elastic support device for up-lift and horizontal force - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely control the up-lift applied to an elastic support device with the control device built-in elastic support device for the up-lift and horizontal force having a simple structure. SOLUTION: A stepped center section projection 5 expanded in diameter on the lower side is protruded at the center section of a lower metal plate 3 fixed to a foundation structure 4, an elastic support body 7 laminated with intermediate rubber layers 13 and reinforcing metal plates 14 in turn is mounted on the lower metal plate 3, and large and small gaps 30, 31 are provided between the center hole of the elastic support body 7 and the center section projection 5. The upper face of the peripheral edge section of the center hole of an upper metal plate 11 fixed to an upper structure 9 is pressed by an up-lift stop metal 12 screwed to the male screw section 15 of the center section projection 5, and a gap is provided between the up-lift stop metal 12 and the periphery of the center hole of the upper metal plate 11. The inner diameter of the center hole of the upper metal plate 11 is set larger than the outer diameter of the upper-stage section of the center section projection 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic bearing device capable of effectively isolating a building or a structure such as a steel girder or a concrete girder in the event of an earthquake. The present invention relates to an elastic bearing device incorporating a device for controlling reaction force) and horizontal force.

[0002]

2. Description of the Related Art Conventionally, as a seismic isolation device for structures, one disclosed in Japanese Examined Patent Publication No. 3-36094 is known.

[0003]

In the conventional seismic isolation device for a structure, when a large lifting force or a horizontal force is applied to the seismic isolation device for a structure, a movement restricting device (horizontal force restricting device) or an uplift is applied to the seismic isolating device. The (uplift) stop device (negative reaction force prevention device) is difficult to handle, and if the structure is designed to deal with the lift and horizontal force, the bearing structure becomes large.

According to the present invention, a movement restricting device for controlling a horizontal force and an upward lift force and an uplift stopping device are collectively provided in a central portion of the elastic supporting device, so that the elastic supporting device can be made compact. The purpose is to provide a device.

[0005]

In order to achieve the above-mentioned object, an elastic bearing device incorporating an upper lift force and horizontal force control device according to the present invention is provided at a central portion of a lower metal plate 3 fixed to a substructure 4. A stepped central portion projection 5 whose diameter is expanded on the lower side is projected,
On the lower metal plate 3, an elastic support body 7 in which an intermediate rubber layer 13 and a reinforcing metal plate 14 are alternately laminated is placed, and a large or small space is provided between the center hole of the elastic support body 7 and the central projection 5. Uplift stopper 12 fixed to the central projection 5 with a gap
Holds the upper surface of the peripheral portion of the center hole of the upper metal plate 11 fixed to the upper structure 9 by the
And a gap between the inner periphery of the center hole of the upper metal plate 11 and
Moreover, the inner diameter of the central hole of the upper metal plate 11 is larger than the outer diameter of the upper step portion of the central projection 5.

Further, according to the present invention, the lower metal plate 3 is fixed to the substructure 4 via the anchor member 1 fixed to the lower metal plate 3, and at the center of the lower metal plate 3, the male screw portion 15 is provided on the outer periphery of the upper portion. , The central portion projection 5 having a plurality of stepped portions having a large diameter on the lower side on the outer periphery is fixed, the sole plate 8 is fixed to the lower portion of the structure 9 via a bolt or an anchor member, and the sole plate 8 is arranged on the lower portion of the sole plate 8. The intermediate rubber layer 13 and the plurality of reinforcing metal plates 14 are provided between the upper metal plate 11 and the lower metal plate 3.
Elastic supporting bodies 7 are alternately laminated in the thickness direction, and large and small gaps 30 are provided between the outer periphery above the step of the central projection 5 and the periphery of the central hole of the elastic supporting body 7. 31 is provided, is inserted into the central hole of the upper metal plate 11, and is screwed into the male screw portion 15 of the central projection 5 by the flange portion 27 of the substantially nut-shaped uplift stopper 12 having the central hole of the upper metal plate 11. Hold the step upper surface 28 of the
And a space around the center hole of the upper metal plate 11,
It is characterized in that the inner diameter of the central hole of the upper metal plate 11 is set larger than the outer diameter of the upper step portion of the central projection 5.

Further, in place of the fixing means for screwing the substantially nut-shaped uplift stopper 12 into the male screw portion 15, a fixing screw 40 which is inserted into the screw hole 39 of the plate-shaped uplift stopper 12a is provided. The uplift stopper 12a may be fixed to the central projection 5 by being screwed into the female screw portion 41 on the upper end surface of the central projection 5.

According to the structure of the present invention, the upper lift force caused by an earthquake is reliably controlled by pressing the upper surface of the peripheral edge of the central hole of the upper metal plate 11 with the uplift stopper 12 fixed to the central projection 5. can do. With respect to the horizontal force due to the earthquake, the inner peripheral surface of the central hole of the elastic support 7 is sequentially engaged with the outer periphery of the stepped central portion projection 5 through the small and large gaps, so that the large horizontal force is gradually increased. Reduced,
Therefore, a large horizontal force can be effectively and smoothly controlled. As described above, according to the present invention, the device for controlling the horizontal force and the lift force due to an earthquake is compactly assembled in the central portion of the elastic bearing device.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show a first embodiment of the present invention. As shown in FIG. 2, the anchor member 1 is inserted from below into a hole 6 formed in the lower metal plate 3, and the lower metal plate 3 is inserted.
The anchor member 1 is fixed to the lower metal plate 3 by screwing the nut 2 into the threaded portion of the anchor member 1 on the upper surface of the anchor member 1, and the anchor member 1 is embedded in the substructure 4 as shown in FIG. Has been done. A circular hole 10 is provided in the central portion of the lower metal plate 3, and the lower portion of a steel central projection 5 having a circular cross section orthogonal to the axial direction is fitted into the circular hole 10 and fixed by welding. ing. Central protrusion 5
Has a male screw portion 15 formed on the outer periphery of its upper end,
Further, on the lower side thereof, first, second, and third step portions 16, 17, and 18 are provided so that the diameter becomes larger, and the circular hole 10 of the lower metal plate 3 is fitted into the circular hole 10. It is a large-diameter portion below the third step 18.

2 and 3 show a set bolt 19 and a sole plate 8 and other members used in the embodiment of the present invention. The sole plate 8 made of a circular steel plate has a plurality of bolt insertion holes. 21 is formed in the bolt insertion hole 21. The set bolt 19 inserted into the bolt hole 32 of the bottom plate 23 of the main girder 22 of the steel girder, which is the structure 9, is inserted into the bolt insertion hole 21.

Further, FIGS. 1 and 2 show an uplift stopper 12, an upper metal plate 11 and an elastic support 7. The upper metal plate 11 is made of a circular steel plate, has a step portion in the middle, has a central hole 24 having a large diameter on the upper side and a small diameter on the lower side, and the set bolt 19 is screwed to the outside of the central hole 24. It has a plurality of female threaded portions 25.
The uplift stopper 12 has a substantially nut shape and has a female screw hole 26 on the inner side and a flange 27 on the upper side.
The uplift stopper 12 is fitted in the center hole 24 of the upper metal plate 11, and at this time, the flange 27 of the uplift stopper 12 has the stepped upper surface 28 of the center hole 24.
Hold down.

The elastic support 7 has a donut shape, has a center hole 29, and is formed by alternately supporting the intermediate rubber layer 13 and the plurality of reinforcing metal plates 14 in the thickness direction.

An elastic support device incorporating the upper lift force and horizontal force control device according to the embodiment of the present invention is constructed by the above-described structure, and FIG. The lower metal plate 3 is placed on the upper surface, the anchor member 1 is embedded in the substructure 4, and the reinforcing metal plate 14 below the elastic support 7 is placed on the upper surface of the lower metal plate 3. The upper surface of the upper reinforcing metal plate 14 is in contact with the lower surface of the upper metal plate 11.

At this time, the inner peripheral surface of the vertical center hole 29 of the elastic support 7 is the outer peripheral surface 18a of the third step of the central projection 5.
And a large gap 30 and a small gap 31 between the inner peripheral surface of the center hole 29 and the first outer peripheral surface 16a and the second outer peripheral surface 17a of the central projection 5 on the upper side thereof. Is provided.

In the female screw portion 25 of the upper metal plate 11 arranged on the upper side of the elastic support 7, bolt insertion holes 32 formed in the bottom plate 23 of the steel girder main girder 22 and the sole plate 8, respectively. , 21 are screwed into the set bolts 19, so that the upper metal plate 11 is fixed to the main girders 22 of the steel girders via the sole plate 8.

At this time, the central hole 2 of the upper metal plate 11
4, the uplift stopper 12 is provided, and the female screw portion 26 thereof is screwed into the male screw portion 15 of the central projection 5, whereby the collar portion 27 of the stopper 12 is at the center. The stepped upper surface 28 of the hole 24 is pressed. here,
As shown in FIG. 4, fixed gaps 20a and 20b are formed between the uplift stopper 12 and the inner peripheral surface of the center hole 24 on the upper and lower sides of the step.

It is preferable that the gaps 20a and 20b have a minimum value that allows rotation of the upper main girder 22 in the case of a fixed bearing, and that only a necessary movement amount is required in the case of a movable bearing.

The inner diameter of the lower portion of the center hole 24 of the upper metal plate 11 is set to be slightly larger than the outer diameter of the first step outer peripheral surface 16a of the central projection 5. Further, a predetermined gap 33 is formed between the upper end surface of the central portion projection 5 and the uplift stopper 12 and the lower surface of the sole plate 8.

Next, FIGS. 8 and 9 show a second embodiment of the present invention. In the embodiment of the first invention, while the elastic bearing device supports the steel girder,
In the embodiment of the second invention, an example in which the elastic bearing device supports the concrete girder that is the structure 9 is shown.
Due to the difference in the object to be supported in this way, the fixing structure of the elastic support device to the supported body is slightly different.

That is, in the second embodiment of the present invention, as shown in FIGS. 8 and 9, the female screw portion 25 provided on the upper metal plate 11 is provided with the male screw portion 34 at the lower end of the anchor member 35. When the structure 9 is screwed and the upper structure 9 is constructed, concrete is poured so that the anchor member 35 is embedded inside.

Further, in the second embodiment of the present invention, when pouring concrete, the flowing concrete may flow through the gap between the center hole 24 of the upper metal plate 11 and the uplift stopper 12 to fill the gaps 20a and 20b. In order to eliminate the above, a lid plate 36 that closes the upper end opening of the center hole 24 is provided. That is, the fixing screw 37 that inserts the lid plate 36 is screwed into the female screw portion 38 of the upper metal plate 11, and the lid plate 3 is inserted.
By fixing 6 to the upper surface of the upper metal plate 11 and closing the upper opening of the central hole 24, the problem that the flowing concrete flows into the central hole 24 is eliminated. In addition, in the embodiment of the second invention, the sole plate 8 is omitted. The other structure is the same as that of the first embodiment.

Next, FIGS. 10, 11, and 12 show a third embodiment of the present invention. In the embodiments of the first and second inventions, the substantially nut-shaped uplift stopper 12 is screwed into the male screw portion 15 of the central projection 5, while in the embodiment of the third invention. Then, the plate-like uplift stopper 12a is provided with a screw hole 39.
The uplift stopper 12a is fixed to the central protrusion 5 by screwing a fixing screw 40 to be inserted into the female screw portion 9 into the female screw portion 41 on the upper end surface of the central protrusion 5. Other configurations are
This is the same as the first and second embodiments of the invention.

The operation of the embodiments of the first, second and third inventions will be described. When an earthquake occurs and a large uplift is applied to the elastic support device, the center of the upper metal plate 11 is The upper surface 28 of the stepped portion of the hole 24 is pressed by the flange portion 27 of the uplift stopper 12 that is screwed and fixed to the central portion projection 5, and the central portion projection 5 is integrated with the lower metal plate 3. The uplift force applied to the metal plate 11 and the upper structure 9 is controlled (prevented) by the uplift stopper 12.

When the upward lift is controlled and the downward force is applied next, the upper metal plate 11 is supported by the elastic support 7 and the inner diameter of the central hole 29 is the central projection 5.
Since the diameter is larger than the outer diameter of the outer periphery 16a of the first stage, the upper metal plate 11 smoothly moves downward while compressing the elastic support body 7 to perform vibration control.

Next, when a horizontal force is applied to the elastic support device, the central projection 5 serves as a stopper to limit the horizontal movement of the elastic support body 7 and the upper metal plate 11 to suppress the vibration. Moreover, at this time, the outer circumference 1 of the first and second step portions of the central projection 5
Since there are large and small gaps 30 and 31 between 6a and 17a and the central hole 29 of the elastic bearing body 7, the elastic bearing body 7 first comes into contact with the second step outer peripheral surface 17a which forms the small gap 31 and the horizontal force. Is partially reduced, and then the first step outer peripheral surface 16a forming the large gap 31 is abutted to further reduce the horizontal force. As described above, in the embodiment of the present invention, the large horizontal force is not controlled at one time but is controlled in a plurality of stages, so that the large horizontal force can be smoothly reduced.

Next, the inner periphery of the center hole 24 of the upper metal plate 11 supported by the elastic support 7 and the uplift stopper 1
Since constant gaps 20a, 20b are also formed between the upper metal plate 1 and the upper metal plate 1,
The horizontal movement of 1 and the rotation of the structure 9 can be smoothly controlled. The male screw portion 15 and the female screw portion 2 shown in the figure serve as means for fixing the uplift stopper 12 to the central projection 5.
Instead of screwing 6 and screwing the fixing screw 40 to the female screw portion 41, a means for fixing with a wedge or the like may be used (however, not shown).

[0027]

As described above, according to the elastic bearing device of the present invention, the upper metal plate 11 for fixing the upper structure 9 with the uplift stopper 12 fixed to the central projection 5 is provided.
The upper lift of the upper part can be reliably controlled, and since the central projection 5 as a stopper has a step, when the elastic support 7 moves in the horizontal direction, the central projection 5 gradually increases in the thickness direction.
Thus, the horizontal movement restriction can be smoothly performed.

Moreover, since the device for controlling the upper lift force and the horizontal force due to the earthquake or the like is compactly arranged in the central portion of the elastic support device, the lower structure (pier or the like) or the upper structure (girder or the like) is arranged. This is useful when the upper bearing and the negative reaction force preventing device are not attached to the outside of the elastic support device due to the space of the above.

Further, in the present invention, the elastic support member 7 is of a donut type having a central hole for passing the central projection 5 which is a movement restricting device (that is, a stopper) in the center thereof, and therefore the upper structure is provided. There is no restriction on the direction of rotation or expansion / contraction of objects (girders), and it can be used for loop bridges, curved bridges, oblique bridges, etc.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing an elastic bearing device according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional side view showing the members of FIG. 1 separated from each other.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is an enlarged vertical sectional view of the lifting force and horizontal force control device of the present invention.

5 is a plan view with the structure of FIG. 1 removed.

FIG. 6 is a plan view of an upper metal plate.

FIG. 7 is a plan view of an elastic bearing body.

FIG. 8 is a vertical sectional side view showing an elastic support device according to a second embodiment of the present invention.

9 is a vertical cross-sectional side view showing the respective members of FIG. 8 separated from each other.

FIG. 10 is a vertical sectional side view showing an elastic bearing device according to a third embodiment of the present invention.

FIG. 11 is a vertical cross-sectional side view showing each member of FIG. 10 separated from each other.

FIG. 12 is an enlarged vertical sectional view of the lifting force and horizontal force control device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anchor member 2 Nut 3 Lower metal plate 4 Foundation structure 5 Center part protrusion 6 Hole 7 Elastic bearing 8 Sole plate 9 Structure 10 Circular hole 11 Upper metal plate 12 Uplift stopper 13 Intermediate rubber layer 14 Reinforcing metal plate 15 Male screw part 16 1st step part 17 2nd step part 18 3rd step part 19 Set bolt 20a Gap 20b Gap 21 Bolt insertion hole 22 Main girder 23 Bottom plate 24 Center hole 25 Female screw part 26 Female screw part 27 Collar part 28 steps Top surface 29 Center hole 30 Large gap 31 Small gap 32 Bolt insertion hole 33 Gap 34 Male screw part 35 Anchor member 36 Lid plate 37 Fixing screw 38 Female screw part 39 Screw hole 40 Fixing screw 41 Female screw part

Claims (3)

[Claims] 1. A lower metal plate (3) fixed to a substructure (4) is provided with a stepped central portion projection (5) having a lower diameter, and an intermediate rubber layer (13) and a reinforcing metal plate are provided on the lower metal plate (3). An uplift which is mounted on the elastic support body 7 in which 14 are alternately laminated, and a large and small gap is provided between the central hole of the elastic support body 7 and the central projection 5 and is fixed to the central projection 5. The upper metal plate 11 fixed to the upper structure 9 by the fasteners 12.
The upper surface of the peripheral portion of the central hole of the upper metal plate 11 is pressed, a gap is provided between the uplift stopper 12 and the inner periphery of the central hole of the upper metal plate 11, and the inner diameter of the central hole of the upper metal plate 11 is set to the central projection 5.
An elastic bearing device with a built-in control device for upper lift and horizontal force, which is larger than the outer diameter of the upper step. 2. A lower metal plate 3 is fixed to a substructure 4 via an anchor member 1 fixed to the lower metal plate 3,
In the central part of the
A central portion projection 5 having a plurality of stepped portions having a large diameter on the lower side on the outer periphery is fixed, and a structure 9 is provided through a bolt or an anchor member.
The sole plate 8 is fixed to the lower part of the
Between the upper metal plate 11 and the lower metal plate 3 arranged in the lower part of the intermediate elastic layer 13 and a plurality of reinforcing metal plates 14 are alternately laminated in the thickness direction, and an elastic support member 7 is interposed. Large and small gaps 30 and 31 are provided between the outer periphery of the central projection 5 above the step and the periphery of the central hole of the elastic support 7, and the central projection 5 is inserted into the central hole of the upper metal plate 11. Up-lift stopper metal fitting 1 in the shape of a nut screwed into the male thread 15 of the
The upper flange 28 of the upper metal plate 11 is pressed against the upper surface 28 of the step portion of the central hole of the upper metal plate 11, and a gap is provided between the uplift stopper 12 and the periphery of the central hole of the upper metal plate 11.
1. An elastic bearing device incorporating an upper lift force and horizontal force control device, characterized in that the inner diameter of the central hole of No. 1 is set larger than the outer diameter of the upper step portion of the central projection 5. 3. A lower metal plate 3 is fixed to a substructure 4 via an anchor member 1 fixed to the lower metal plate 3.
In the central part of the
A central portion projection 5 having a plurality of stepped portions having a large diameter on the lower side on the outer periphery is fixed, and a structure 9 is provided through a bolt or an anchor member.
The sole plate 8 is fixed to the lower part of the
Between the upper metal plate 11 and the lower metal plate 3 arranged in the lower part of the intermediate elastic layer 13 and a plurality of reinforcing metal plates 14 are alternately laminated in the thickness direction, and an elastic support member 7 is interposed. Uplift metal fittings 12a inserted into the central hole of the upper metal plate 11 are provided with large and small gaps 30 and 31 between the outer periphery above the step of the central projection 5 and the periphery of the central hole of the elastic support 7.
The upper surface 2 of the step portion of the central hole of the upper metal plate 11 by the flange portion 27 of
8 is provided and a gap is provided between the uplift stopper 12a and the periphery of the center hole of the upper metal plate 11.
To the female screw portion 41 on the upper end surface of the
The upper lift force is characterized in that the fixing screw 40 is inserted through the screw hole 39 of a and the inner diameter of the central hole of the upper metal plate 11 is set larger than the outer diameter of the upper step portion of the central protrusion 5. Elastic support device with horizontal force controller.