JPH047766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a seismic isolation device for structures that absorbs and attenuates seismic energy of superstructures such as bridge girders when an earthquake occurs.

[Conventional technology]

Conventionally, as a seismic isolation device for structures, JP-A-52-
As disclosed in Publication No. 49609, a steel upper end plate, a steel intermediate plate, and a steel lower end plate are arranged at intervals in the vertical direction, and a rubber layer is interposed between them to integrally connect them. There is also known a seismic isolation device having a structure in which a lead column passing through an intermediate plate and a rubber layer is interposed between the upper end plate and the lower end plate.

[Problem to be solved by the invention]

In the case of the conventional seismic isolation device, when the upper end plate is moved laterally relative to the lower end plate due to horizontal seismic force, the rubber layer is pressed and deformed in the lateral direction, and when the pressing force is released from the upper end plate, the rubber layer Since the return elastic force acts to press the upper end plate in the opposite direction, there is a problem that the seismic isolation effect is low.

An object of the present invention is to provide a seismic isolation device for structures that has a large seismic isolation effect.

[Means to solve the problem]

In order to achieve the above object, in the structure seismic isolation device of the present invention, a lower support member 1 fixed to a lower structure has a pair of intermediate support surfaces 2 extending parallel to the direction of movement of the upper structure. , the outer surface of the metal gripping plate 3 and the wall of the lower support member 1, which are spaced apart in a direction perpendicular to the direction of movement of the upper structure and are disposed on both sides of the direction of movement of the upper structure on each of the intermediate bearing surfaces 2; An elastic member 5 made of a rubber material or a leaf spring made of spring steel is interposed between the elastic member 5 and the plate 4, and the end of the grip plate 3 is engaged with both ends of the lower support member 1 in the direction of movement of the upper structure. An upper support member 7 provided with a stopper 6 and fixed to the upper structure
A vertical support plate 8 is fixed to the lower part of the support plate 8, and the support plate 8 is fitted between the pair of intermediate support surfaces 2, and the inner surface distance D1 of the pair of opposing grip plates 3 is equal to the thickness T of the support plate 8. is set smaller than.

[Effect]

When the upper structure and the supporting plate 8 fixed thereto move horizontally in a reciprocating manner in the longitudinal direction of the intermediate bearing surface 2 due to the action of a horizontal seismic force, the supporting plate 8 moves horizontally in one longitudinal direction of the intermediate bearing surface 2. When the support plate 8 moves, the elastic member 5 is compressed and fitted between the pair of metal grip plates 3 on one side of the intermediate support surface 2, so that the elastic member 5 moves in one direction of the support plate 8. resists the horizontal displacement force of

Next, when the support plate 8 moves horizontally in the other longitudinal direction of the intermediate support surface 2, the support plate 8 grips the pair of metal grip plates 3 by the pair of elastic members 5 on one side of the intermediate support surface 2. Since the support plate 8 is gripped through the intermediate support surfaces 2, resistance acts on the return horizontal movement force in the other direction, and the support plate 8 is then gripped by the pair of intermediate support surfaces 2.
When the support plate 8 passes through the gap and moves horizontally in the other direction, the support plate 8 fits between the pair of metal grip plates 3 on the other side of the intermediate support surface 2 while compressing the elastic member 5. Therefore, the elastic member 5 resists the horizontal movement force of the support plate 8 in the other direction, and the same operation is repeated thereafter to attenuate the vibration energy of the upper structure due to the earthquake.

〔Example〕

Next, the present invention will be explained in detail based on an example shown in the drawings.

1 to 5 show an embodiment of the present invention, in which a steel lower support member 1 is fixed to a lower structure 9 such as a concrete abutment or a bridge pier.
A superstructure 1 such as a concrete bridge girder is placed on top of the
A pair of vertical intermediate bearing surfaces 2 extending parallel to the moving direction of the superstructure 0, that is, the front-back direction, are provided at intervals in a direction perpendicular to the upper structure moving direction, that is, the left-right direction, and the front and rear of each intermediate bearing surface 2 is A metal gripping plate 3 made of a vertical stainless steel plate is arranged on both sides, and a plate-shaped rubber An elastic member 5 made of material is interposed therebetween, and stoppers 6 for engaging the ends of the gripping plate 3 are integrally provided at the upper portions of both the front and rear ends of the lower support member 1.

The gripping plate 3 is held so as not to move in the front-rear direction by a stepped portion provided at the end of the intermediate support surface 2 and a stopper 6, and a central portion on the inner side of the stopper 6 is provided with a portion facing in the left-right direction. A gap-maintaining protrusion 11 is integrally provided between the ends of the grip plate 3.

The lower support member 1 is placed on the lower structure 9 and fixed with a large number of anchor bolts 12, and the steel upper support member 7 to which a large number of anchor members 13 are fixed is embedded and fixed in the lower part of the upper structure 10. An upper part of a vertical steel support plate 8 extending in the front-rear direction is integrally connected to the lower part of the upper support member 7, and the support plate 8 is fitted between the pair of intermediate support surfaces 2. Further, wedge-shaped portions are formed at both front and rear ends of the support plate 8, and the wedge-shaped portions are arranged between the ends of the pair of grip plates 3 facing each other in the left-right direction.

FIG. 5 shows that the upper structure 10 and the support plate 8 fixed thereto move in the front-rear direction due to horizontal seismic force, and the support plate 8 moves between the pair of grip plates 3 while compressing the elastic member 5. This shows the state in which the

FIG. 6 shows an embodiment in which a leaf spring made of spring steel is used as the elastic member 5.

When carrying out the present invention, the elastic member 5 made of a rubber material may be integrally fixed to the grip plate 3 by adhesive or baking, and the metal grip plate 3 may be a stainless steel plate fixed to the inner surface of the steel plate. You may use something. Furthermore, the support plate 8 may be a steel plate with a stainless steel plate fixed to its circumferential surface.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

When the upper structure 10 and the supporting plate 8 fixed thereto reciprocate in the longitudinal direction of the intermediate bearing surface 2 due to horizontal seismic force, when the supporting plate 8 moves horizontally in one longitudinal direction of the intermediate bearing surface 2. , since the support plate 8 fits between the pair of metal grip plates 3 on one side of the intermediate support surface 2 while compressing the elastic member 5, the elastic member 5 holds the support plate 8 horizontally in one direction. When the support plate 8 resists the moving force and then moves horizontally in the other longitudinal direction of the intermediate bearing surface 2, the support plate 8 is moved between the pair of elastic members 5 on one side of the intermediate bearing surface 2. Since it is gripped via the metal gripping plate 3, resistance acts on the return horizontal movement force of the support plate 8 in the other direction, and then the support plate 8 passes between the pair of intermediate support surfaces 2 and As the support plate 8 moves horizontally in the direction, the elastic member 5 is compressed and fitted between the pair of metal grip plates 3 on the other side of the intermediate support surface 2.
resists the horizontal movement force of the support plate 8 in the other direction, and the same operation is repeated thereafter, so that the vibration energy of the upper structure 10 caused by an earthquake can be effectively damped.

Further, when a rubber material is used as the elastic member 5, the frictional gripping force can be increased or decreased by changing the thickness and hardness of the rubber material.

[Brief explanation of drawings]

Figures 1 to 5 show one embodiment of the present invention, in which Figure 1 is a cross-sectional plan view of a structure seismic isolation device, Figure 2 is a partially vertical side view thereof, and Figure 3 is a cross-sectional plan view of a structure seismic isolation device. Figure 2 is a cross-sectional view taken along the line A-A in Figure 2, Figure 4 is a cross-sectional view taken along the line B-B in Figure 2, and Figure 5 is a cross-sectional plane showing the state in which the support plate moves between a pair of gripping plates while compressing the rubber material. It is a diagram. FIG. 6 is a cross-sectional plan view of a structure seismic isolation device showing another embodiment of the present invention. In the figure, 1: lower support member, 2: intermediate support surface,
3: metal grip plate, 4: wall plate, 5: elastic member,
6: stopper, 7: upper support member, 8: support plate,
9: Lower structure, 10: Upper structure, 11: Spacing protrusion, 12: Anchor bolt, 13: Anchor member.

Claims (1)

[Claims] 1. A lower support member 1 fixed to a lower structure,
A pair of intermediate bearing surfaces 2 extending parallel to the upper structure movement direction are provided at intervals in a direction perpendicular to the upper structure movement direction, and on both sides of the upper structure movement direction on each intermediate bearing surface 2. An elastic member 5 is interposed between the outer surface of the disposed metal grip plate 3 and the wall plate 4 of the lower support member 1.
Stoppers 6 for engaging the ends of the gripping plate 3 are provided at both ends in the direction of movement of the upper structure, and a vertical support plate 8 is fixed to the lower part of an upper support member 7 fixed to the upper structure. The support plate 8 is fitted between the pair of intermediate support surfaces 2, and the inner surface interval D1 of the pair of opposing grip plates 3 is set smaller than the thickness T of the support plate 8. Device. 2. The seismic isolation device for a structure according to claim 1, wherein the elastic member 5 is made of a rubber material. 3. Claim 1, wherein the elastic member 5 is a leaf spring made of spring steel.
Seismic isolation device for the structure described.