JPH0978530A - 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 shrunk in diameter on the lower side is protruded at the center section of an upper metal plate 11 fixed to an upper structure 9, an elastic support body 7 laminated with rubber layers 13 and reinforcing metal plates 14 in turn is mounted on a lower metal plate 3 fixed to a foundation structure 4, 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 lower face of the peripheral edge section of the center hole of the upper metal plate 11 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 lower metal plate 3. The inner diameter of the center hole of the lower metal plate 3 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, the movement restricting device for controlling the horizontal force and the lifting force and the uplift stopping device are collectively provided in the central portion of the elastic supporting device, so that the device can be made compact. The purpose is to provide a support device.

[0005]

In order to achieve the above-mentioned object, an elastic support device incorporating an upper lift force and horizontal force control device according to the present invention has an upper metal plate 11 fixed to an upper structure 9.
Elasticity formed by projecting a stepped central projection 5 with a reduced diameter in the central part of the lower part, and alternately stacking an intermediate rubber layer 13 and a reinforcing metal plate 14 on a lower metal plate 3 fixed to a substructure 4. The support 7 is placed, a large and small gap is provided between the center hole of the elastic support 7 and the central protrusion 5, and the lower metal plate 3 is fixed by the uplift stopper 12 fixed to the central protrusion 5. Hold the lower surface of the peripheral edge of the center hole of the
And an inner circumference of the center hole of the lower metal plate 3, and an inner diameter of the center hole of the lower metal plate 3 is set to be larger than an outer diameter of the lower portion of the central protrusion 5. .

Further, according to the present invention, the lower metal plate 3 placed on the lower support member 8 is attached to the substructure 4 via the anchor member 1.
, And the upper metal plate 11 fixed to the upper structure 9 has a male screw portion 15 on the outer circumference of the lower portion and a central projection 5 having a plurality of stepped portions having a small diameter on the outer circumference.
And an elastic support 7 formed by alternately stacking an intermediate rubber layer 13 and a plurality of reinforcing metal plates 14 in the thickness direction between the upper metal plate 11 and the lower metal plate 3, and the central portion Protrusion 5
The large and small gaps 30 and 31 are provided between the outer periphery of the lower part of the step and the periphery of the center hole of the elastic support 7, and are inserted into the center hole of the lower metal plate 3 and the male screw part of the central projection 5 is formed. Collar portion 2 of substantially nut-shaped uplift stopper 12 screwed to 15
The lower surface 28 of the step portion of the central hole of the lower metal plate 3 is pressed by 7 and a gap is provided between the uplift stopper 12 and the periphery of the central hole of the lower metal plate 3 so that the inner diameter of the central hole of the lower metal plate 3 is reduced. It is characterized in that it is provided larger than the outer diameter of the lower part 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 38 on the lower end surface of the central projection 5.

According to the configuration of the present invention, the upper lift force due to an earthquake is reliably controlled by pressing the upper surface of the peripheral portion 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, and as shown in FIG. 2, an anchor member is provided in a lower support member 8 and a hole 6 formed in a lower metal plate 3 placed on the lower support member 8. 1 is inserted from below, and the nut 2 is screwed onto the threaded portion of the anchor member 1 on the upper surface of the lower metal plate 3,
The anchor member 1 is fixed to the lower metal plate 3 as shown in FIG.
The anchor member 1 is embedded in the substructure 4, as shown in FIG.

On the other hand, the upper metal plate 11 is applied to the lower surface of the bottom plate 23 of the main girder 22 of the steel girder which is the upper structure 9,
The upper metal plate 11 is fixed to the main girder 22 of the steel girder by screwing the set bolt 19 inserted through the bolt hole 32 of the bottom plate 23 into the female screw portion 21 of the upper metal plate 11.

A circular hole 10 is provided in the central portion of the upper metal plate 11, and the upper portion of a central portion projection 5 made of steel and having a circular cross section orthogonal to the axial direction is fitted into the circular hole 10 for welding. It is fixed by. The central projection 5 has a male screw portion 15 formed on the outer periphery of the lower end portion thereof, and further has a first, second, and third step portion 1 on the upper side thereof so that the diameter increases in order.
6, 17, 18 are provided, and the upper metal plate 11
The large-diameter portion above the third step 18 is fitted into the circular hole 10.

Further, FIG. 1 and FIG. 2 show an upper metal plate 11, an uplift (uplift force) stopper 12, a lower metal plate 3 and an elastic support 7. The lower metal plate 3 is made of a steel plate, has a step in the middle, has a central hole 24 having a small diameter on the upper side and a large diameter on the lower side, and the anchor member 1 is fitted to the outside of the central hole 24. It has a plurality of holes 6. The uplift stopper 12 has a substantially nut shape and has a female screw portion 26 on the inner side and a flange portion 27 on the lower portion. The uplift stopper 12 fits into the center hole 24 of the lower metal plate 3, and at this time, the flange 27 of the uplift stopper 12 has the stepped surface 2 of the center hole 24.
Hold down 8.

The elastic support 7 has a donut shape, has a central 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.

The 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. 1 is a sectional view showing the assembly thereof. The lower support member 8 is placed on the upper surface, and the lower metal plate 3 is placed thereon. Furthermore, 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, and the upper surface of the upper reinforcing metal plate 14 contacts the lower surface of the upper metal plate 11. ing.

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

A set bolt inserted into a bolt insertion hole 32 formed in a bottom plate 23 of a main girder 22 of a steel girder is attached to a female screw portion 21 of an upper metal plate 11 disposed above the elastic support 7. 19 are screwed together so that the upper metal plate 1
1 is fixed to the main girder 22 of the steel girder.

On the other hand, the uplift stop fitting 12 is disposed through the central hole 24 of the lower metal plate 3, and the female screw portion 26 thereof is screwed into the male screw portion 15 of the central projection 5.
As a result, the collar portion 27 of the fastener 12 has the center hole 2
4, the lower surface 28 of the step portion is pressed. Here, as shown in FIG. 4, a constant gap 20 is provided between the uplift stopper 12 and the inner peripheral surface of the center hole 24 on the upper and lower sides of the step portion.
a and 20b are formed.

The gaps 20a and 20b have a minimum value that allows the upper main girder 22 to rotate with respect to the lower substructure 4 in the case of a fixed bearing, and take only the required movement amount in the case of a movable bearing. Is good.

The inner diameter of the lower portion of the center hole 24 of the lower metal plate 3 is set to be slightly larger than the outer diameter of the first step outer peripheral surface 16a of the central projection 5. Also, a predetermined gap 33 is formed between the upper end surfaces of the central projection 5 and the uplift stopper 12, and the lower surface of the lower support member 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 second embodiment of the present invention, an example in which the elastic bearing device supports the concrete girder as the upper structure 9 is shown. The fixing structure of the elastic bearing device is slightly different.

That is, in the second embodiment of the present invention, as shown in FIGS. 8 and 9, the female screw portion 21 provided on the upper metal plate 11 is provided with the male screw portion 34 at the lower end of the anchor member 35. It is screwed, and when the upper structure 9 is constructed, concrete is poured so that the anchor member 35 is embedded inside.

Further, in the embodiment of the second aspect of the present invention, when the foundation structure 4 is poured into concrete, the fluidized concrete is applied to the center hole 24 of the lower metal plate 3 and the uplift stopper 12.
A lid plate 36 is provided to close the lower end opening of the center hole 24 in order to eliminate the risk of flowing through the gap between the center holes 24 and 20a and 20b. That is, the fixing screw 37 that inserts the lid plate 36 is screwed into the female screw portion 38 of the lower metal plate 3 to fix the lid plate 36 to the lower surface of the lower metal plate 3, and the center hole 2
By closing the lower opening of No. 4, the problem that fluid concrete flows into the center hole 24 is eliminated. 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 projection 5 by screwing the fixing screw 40 to be inserted into the female screw thread 9 into the female screw portion 41 on the lower end surface of the central projection 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 lower metal plate 3 Since the lower surface 28 of the stepped portion of the hole 24 is pressed by the flange portion 27 of the uplift stopper fitting 12 screwed and fixed to the central portion projection 5, the central portion projection 5 is integrated with the upper metal plate 11, 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 lower metal plate 3 relatively smoothly moves upward 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 lower metal plate 3 supporting the elastic support 7 and the uplift stopper 12
Since constant gaps 20a and 20b are also formed between the upper metal plate 11 and the upper metal plate 11 through the gaps 20a and 20b.
The horizontal movement 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).

[0028]

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, etc.) or the upper structure (girder, etc.) 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 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) at 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 an upper lift and horizontal force control device, which is a main part 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 an upper lift and horizontal force control device, which is a main part of the present embodiment.

[Explanation of symbols]

 1 Anchor Member 2 Nut 3 Lower Metal Plate 4 Foundation Structure 5 Center Protrusion 6 Hole 7 Elastic Bearing 8 Lower Support Member 9 Upper Structure 10 Circular Hole 11 Upper Metal Plate 12 Uplift Stopper 13 Intermediate Rubber Layer 14 Reinforcing Metal Plate 15 Male screw part 16 First step part 17 Second step part 18 Third step part 19 Set bolt 20a Gap 20b Gap 21 Female screw part 22 Main girder 23 Bottom plate 24 Center hole 26 Female screw part 27 Collar part 28 Step part lower 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. An upper metal plate 1 fixed to an upper structure 9.
1 is provided with a stepped central portion projection 5 having a reduced diameter at the central portion of 1, and an intermediate rubber layer 13 and a reinforcing metal plate 14 are alternately laminated on a lower metal plate 3 fixed to a substructure 4. The elastic support 7 is placed, a large and small gap is provided between the central hole of the elastic support 7 and the central projection 5, and the lower metal plate is fixed by the uplift stopper 12 fixed to the central projection 5. Hold the lower surface of the peripheral edge of the center hole of No. 3 and hold the uplift metal fitting 1
2 and the inner periphery of the center hole of the lower metal plate 3,
Further, 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 the lower metal plate 3 is set larger than the outer diameter of the lower step portion of the central projection 5. 2. The lower metal plate 3 mounted on the lower support member 8.
Is fixed to the substructure 4 via the anchor member 1, and the upper metal plate 11 fixed to the upper structure 9 has a male screw portion 15 on the outer periphery of the lower part and a lower part having a smaller diameter. The central protrusion 5 having the step portion of the outer periphery is fixed, and the intermediate rubber layer 13 and the plurality of reinforcing metal plates 14 are alternately laminated in the thickness direction between the upper metal plate 11 and the lower metal plate 3. The bearing 7 is interposed, and large and small gaps 30 and 31 are provided between the outer periphery of the central projection 5 below the step and the periphery of the center hole of the elastic bearing 7, and the central hole of the lower metal plate 3 is provided. The upper surface of the stepped lower surface 28 of the central hole of the lower metal plate 3 by the flange portion 27 of the substantially nut-shaped uplift stopper 12 which is screwed into the male screw portion 15 of the central portion projection 5 and is stopped. A space is provided between the metal fitting 12 and the periphery of the center hole of the lower metal plate 3, Lift and horizontal force control device embedded elastic bearing device on, characterized in that provided on the larger inner diameter of the central hole from the lower outer diameter of the central portion protruding 5 genera plate 3. 3. The lower metal plate 3 mounted on the lower support member 8.
Is fixed to the substructure 4 via the anchor member 1, and the upper metal plate 11 fixed to the upper structure 9 has a male screw portion 15 on the outer periphery of the lower part and a lower part having a smaller diameter. The central protrusion 5 having the step portion of the outer periphery is fixed, and the intermediate rubber layer 1 is provided between the upper metal plate 11 and the lower metal plate 3.
3 and a plurality of reinforcing metal plates 14 are alternately laminated in the thickness direction, and an elastic supporting body 7 is interposed, and the outer periphery of the central projection 5 is below the outer periphery and the periphery of the central hole of the elastic supporting body 7. Large and small gaps 30 and 31 are provided between the upper and lower metal plates 3, and the flange 27a of the uplift stopper 12a inserted into the central hole of the lower metal plate 3 presses the lower surface 28 of the step portion of the central hole of the lower metal plate 3 to stop the uplift. A gap is provided between the metal fitting 12a and the periphery of the central hole of the lower metal plate 3, and the female screw portion 3 of the lower end surface of the central projection 5 is formed.
8, the screw hole 39 of the uplift stopper 12a is inserted and the fixing screw 40 is screwed into the screw hole so that the inner diameter of the central hole of the lower metal plate 3 is larger than the outer diameter of the lower step portion of the central projection 5. An elastic bearing device with a built-in control device for upper lift force and horizontal force.