JPH0674570B2 - Seismic isolation rubber support device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a seismic isolation rubber bearing device that allows a bridge girder to exhibit a seismic isolation function by using a rubber bearing.

(Prior Art) Conventionally, as a sliding movement type rubber bearing device, as shown in FIG. 12, a movable sliding plate 26 of synthetic resin is fixed to the lower surface of the rubber layer 1, and a female screw metal fitting is provided on the upper portion of the rubber layer 1. 27 is embedded and fixed to form a rubber support 28, the rubber support 28 is brought into contact with the lower surface of the steel bridge girder 29, and the rubber support 28 is fixed to the bridge girder 29 by the bolt 30 screwed into the female screw fitting 27. A sliding movement type of a structure in which a fixed slide plate 32 made of synthetic resin is fixed to the upper surface of a metal pedestal 31 fixed and fixed to the lower structure 5, and the movable slide plate 26 is mounted on the fixed slide plate 32. Rubber bearing devices are known.

(Problems to be solved by the invention) In the case of the conventional sliding movement type rubber bearing device, when the bridge girder vibrates due to the seismic force in the bridge axis direction acting on the bridge girder, the rubber bearing device has only one sliding surface. Therefore, the sliding resistance is small, and the rubber layer undergoes shear deformation while undergoing sliding resistance, so the amount of shear deformation of the rubber layer is small, and therefore the shear resistance of the rubber layer is also small. In the case of the device, the seismic isolation effect against the seismic force in the bridge axis direction is small, and when the seismic force in the bridge axis direction acts on the bridge girder, the girder vibrates with a large amplitude for a long time.

In addition, when the bridge girder receives a seismic force in the bridge axis direction, the rubber layer undergoes shear deformation while receiving slip resistance, so when the vibration of the bridge girder stops due to seismic force, the rubber layer in the rubber bearing remains shear deformed. There is a problem that it stops in the state of.

INDUSTRIAL APPLICABILITY The present invention can effectively exert the seismic isolation effect of a bridge by using a rubber bearing, and when the vibration due to the seismic force is stopped, stop the rubber layer in the rubber bearing without causing shear deformation. The purpose of the present invention is to provide a seismic isolation rubber bearing device that can be used.

(Means for Solving the Problem) In order to achieve the above object, in the seismic isolation rubber bearing device of the present invention, a rubber layer 1 and a lower metal plate 2 and an upper metal plate 3 integrally connected to the rubber layer 1 are provided. The rubber support 4 is
A base plate 6 fixed to the lower structure 5 and a sole plate 8 fixed to the bridge girder 7 are slidably interposed, and the lower metal plate 2 and the sole plate 8 relatively move in the bridge axial direction. The upper metal plate 3 and the base plate 6 are engaged so as not to move relative to each other in the bridge axis direction.

In addition, a rubber support 4 including a rubber layer 1 and a lower metal plate 2 and an upper metal plate 3 integrally connected to the rubber layer 1 includes a base plate 6 fixed to a lower structure 5 and a sole plate 8 fixed to a bridge girder 7. A plurality of pressed projections 9 which are slidably interposed between the lower metal plate 2 and both sides of the lower metal plate 2 in the direction perpendicular to the bridge axis and which are arranged at intervals in the bridge axis direction. At both ends of the plate 8 in the direction of the bridge axis in the direction perpendicular to the bridge axis, pressing projections 10 that engage with the outer end surfaces of the pressed projections 9 in the direction of the bridge axis are provided, and both sides of the base plate 6 in the direction perpendicular to the bridge axis are provided. In the bridge axis direction and the bridge shaft direction center portions on both sides of the upper metal plate 3 in the direction perpendicular to the bridge axis are the upper metal plate movement preventing engagement members.
The above object can also be achieved by engaging through 11 so as not to move relatively in the axial direction of the bridge.

Furthermore, a rubber bearing 4 including a rubber layer 1 and a lower metal plate 2 and an upper metal plate 3 integrally connected to the rubber layer 1,
It is slidably interposed between a base plate 6 fixed to the lower structure 5 and a sole plate 8 fixed to the bridge girder 7, and is pressed to the center portion of the sole plate 8 on both sides in the direction perpendicular to the bridge axis in the direction perpendicular to the bridge axis. The protrusions 12 are integrally provided, and the pressed protrusions 13 engaged with both sides of the pressing protrusions 12 in the bridge axis direction are integrally formed at intermediate portions in the bridge axis direction of the lower metal plate 2 on both sides in the direction perpendicular to the bridge axis. A plurality of engaging projections 14 are provided integrally on both sides of the upper metal plate 3 in the direction perpendicular to the bridge axis, and are provided integrally with each other at a distance in the bridge axis direction. It is also possible to achieve the above object by integrally providing the upper metal plate movement preventing locking projections 15 that engage with the bridge axial direction outer end surfaces of the engaging projections 14 at both ends in the bridge axial direction. it can.

(Operation) When the bridge girder 7 moves in the bridge axis direction due to the seismic force, the sole plate 8 fixed to the bridge girder 7 slides with respect to the upper metal plate 3 of the rubber support 4 and also moves to the sole plate 8. The lower metal plate 2 of the engaged rubber bearing 4 slides with respect to the base plate 6, and the upper metal plate 3 of the rubber bearing 4 is engaged with the base plate 6 so as not to move in the bridge axis direction, Since the lower metal plate 2 of the support 4 is engaged with the sole plate 8 and moved by the same amount as the sole plate 8, the rubber layer 1 of the rubber support 4 is equal to the amount of movement of the sole plate 8. Sheared.

(Example) Next, the present invention will be described in detail based on an example shown in the drawings.

1 to 6 show a first embodiment of the present invention, in which a lower metal plate 2 is integrally fixed to a lower surface of a rubber layer 1 and an upper metal plate is attached to an upper surface of the rubber layer 1. 3 are integrally fixed to each other to form a rubber support 4, and the rubber support 4 has an upper surface of the upper metal plate 3 at the center in the direction perpendicular to the bridge axis (width direction of the bridge girder) in the bridge axis direction (longitudinal direction of the bridge girder). A pair of engaging projections, which are integrally connected to each other, and which are arranged in the bridge axial direction intermediate portions on both sides of the upper metal plate 3 in the direction perpendicular to the bridge axial direction at intervals in the bridge axial direction. 17 are integrally connected to each other, and further, pressed projections 9 are integrally provided at both ends in the bridge axis direction on both sides of the lower metal plate 2 in the direction perpendicular to the bridge axis, and on the lower surface of the lower metal plate 2, The lower movable sliding plate 18 made of synthetic resin such as tetrafluoroethylene,
An upper fixing slide plate 19 made of a synthetic resin such as ethylene tetrafluoride is fixed to the upper surface of the upper metal plate 3 by an adhesive or the like.

The lower part of the locking projection 20 is integrally connected to the central portion of the steel base plate 6 in the direction of the bridge axis on both sides in the direction perpendicular to the bridge axis, and the lower fixed sliding plate 21 made of a stainless steel plate is welded to the upper surface of the base plate 6 by welding or the like. The anchor members 22 are fixed to each other, and the upper portions of the plurality of acre members 22 are connected to the lower portion of the base plate 6, and the anchor members 22 are embedded and fixed in the lower structure 5 such as a concrete abutment or bridge pier, and the base plate 6 is fixed to the lower structure 5. Placed on the upper surface of.

The upper ends of the pressing projections 10 are integrally connected to both ends of the steel sole plate 8 on both sides in the direction perpendicular to the bridge axis in the bridge axial direction, and at the center of the lower surface of the sole plate 8 in the direction perpendicular to the bridge axis. An engaging groove 23 extending in the axial direction is provided, an upper movable slide plate 24 made of a stainless steel plate is fixed to the lower surface of the sole plate 8 by welding or the like. The anchor bar 25 is embedded and fixed in the concrete bridge girder 7, and the sole plate 8 is brought into contact with the lower surface of the bridge girder 7.

The rubber support 4 is interposed between the base plate 6 and the sole plate 8, and the upper movable slide plate 24 below the sole plate 8 slides in the bridge axial direction on the upper fixed slide plate 19 above the rubber support 4. The lower movable sliding plate 18 at the lower part of the rubber support 4 is movably mounted on the lower fixed sliding plate 21 at the upper part of the base plate 6 so as to be slidable in the bridge axis direction. Projections at both ends in the direction
10 is arranged in contact with or close to the bridge axis direction outer end surface of the pressed projections 9 provided at both ends of the lower metal plate 2 in the bridge axis direction, and the upper ends of the locking projections 20 are paired with each other. Protrusion
The pair of engaging projections 17 and the locking projections 20 are inserted between the two.
The above constitutes an engagement member 11 for preventing movement of the upper metal plate.

When the bridge girder 7 and the sole plate 8 fixed to the bridge girder 7 are moved in the bridge axis direction by the seismic force, the upper metal plate 3 and the base plate 6 in the rubber support 4 are intervened by the upper metal plate movement preventing engagement member 11. Since it is engaged so as not to move relatively in the bridge axis direction, the sole plate 8 slides with respect to the upper metal plate 3 of the rubber bearing 4, and the pressing projection 10 provided on the sole plate 8 Since the lower metal plate 2 of the rubber support 4 is pressed and moved in the bridge axis direction via the pressed projection 9, the lower metal plate 2 is attached to the sole plate 8
The rubber layer 1 of the rubber support 4 is also shear-deformed by an amount equal to the amount of movement of the sole plate 8 by sliding in the bridge axial direction by an amount equal to.

Therefore, against the seismic force acting on the bridge girder 7 in the axial direction of the bridge, the sliding resistance of the lower metal plate 2 and the base plate 6 of the rubber support 4 and the sliding of the upper metal plate 3 and the sole plate 8 of the rubber support 4 are prevented. The vibration of the bridge girder 7 is effectively damped by the resistance and the large shear resistance based on the large shear deformation amount of the rubber layer 1 which is equal to the movement amount of the sole plate 8.

7 to 11 show a second embodiment of the present invention, in which the lower surface of the lower metal plate 2 in the rubber bearing 4 is
A ridge 16 extending in the bridge axis direction at the center in the direction perpendicular to the bridge axis
Are integrally provided, and a pair of pressed projections 13 arranged at intervals in the bridge axis direction are integrally provided at intermediate portions in the bridge axis direction on both sides of the lower metal plate 2 in the direction perpendicular to the bridge axis. Engagement protrusions 14 are integrally provided at both ends in the direction of the bridge axis of the upper metal plate 3 in the rubber support 4 in the direction perpendicular to the bridge axis, and a lower movable slide plate 18 is fixed to the lower surface of the lower metal plate 2. The upper fixed slide plate 19 is fixed to the upper surface of the upper metal plate 3.

Lower portions of the upper metal plate movement preventing locking projections 15 are integrally provided at both ends in the bridge axis direction on both sides of the steel base plate 6 in the bridge axis perpendicular direction, and the upper surface of the base plate 6 is centered in the bridge axis perpendicular direction. The engaging groove 23 extending in the bridge axial direction.
And a lower fixed sliding plate on the upper surface of the base plate 6.
21 is fixed, and the upper part of the plurality of anchor members 22 is connected to the lower part of the base plate 6, and the anchor members 22
Is embedded in and fixed to the lower structure 5, and the base plate 6 is placed on the upper surface of the lower structure 5.

Upper portions of the pressing protrusions 12 are integrally provided at the central portions of the steel sole plate 8 on both sides in the direction perpendicular to the bridge axis in the bridge axis direction,
Moreover, an upper movable slide plate 24 is fixed to the lower surface of the sole plate 8.

The rubber support 4 is interposed between the base plate 6 and the sole plate 8, and the upper movable slide plate 24 below the sole plate 8 slides in the bridge axial direction on the upper fixed slide plate 19 above the rubber support 4. The lower movable sliding plate 18 at the lower part of the rubber support 4 is movably mounted on the lower fixed sliding plate 21 at the upper part of the base plate 6 so as to be slidable in the bridge axial direction, and further, the pressing projection on the sole plate 8 is placed. The lower part of 12 is inserted between a pair of pressed projections 13, and locking projections 15 for preventing movement of the upper metal plate at both ends of the base plate 6 in the bridge axis direction.
Are arranged in contact with or close to the outer end faces in the bridge axis direction of the engagement protrusions 14 provided at both ends of the upper metal plate 3 in the bridge axis direction.

Also in the case of the second embodiment, with respect to the seismic force acting on the bridge girder 7 in the bridge axial direction, the slip resistance of the lower metal plate 2 and the base plate 6 of the rubber support 4 and the upper metal plate 3 of the rubber support 4 are increased. The vibration of the bridge girder 7 is effectively damped by the slip resistance of the sole plate 8 and the large shear resistance based on the large shear deformation amount of the rubber layer 1 which is equal to the movement amount of the sole plate 8.

In the case of implementing the present invention, when using a corrosion-resistant metal as the lower metal plate 2, the upper metal plate 3, the base plate 6 and the sole plate 8, the sliding plate may be omitted. Also, when fixing to the steel bridge girder of the sole plate 8, an anchor rod
25 is omitted, the upper surface of the sole plate 8 is formed into a flat shape, and the sole plate 8 is fixed to the steel bridge girder by welding or the like.

(Effects of the Invention) Since the present invention is configured as described above, it has the effects described below.

When the bridge girder 7 and the sole plate 8 fixed to the bridge girder 7 are moved in the bridge axis direction by the seismic force, the upper metal plate 3 and the base plate 6 in the rubber support 4 are engaged so as not to move relatively in the bridge axis direction. Since the sole plate 8 is slid with respect to the upper metal plate 3 of the rubber bearing 4, and the engagement between the sole plate 8 and the lower metal plate 2 of the rubber bearing 4 causes the rubber bearing 4 to move. Since the lower metal plate 2 is pressed and moved in the bridge axis direction, the lower metal plate 2 slides and moves in the bridge axis direction by an amount equal to that of the sole plate 8, and the rubber layer 1 of the rubber support 4 also moves by the sole plate 8. The shear resistance of the lower metal plate 2 and the base plate 6 of the rubber bearing 4 and the upper metal plate of the rubber bearing 4 are sheared by an amount equal to 3 and And the sliding resistance of Rupureto 8, by a large shearing resistance based on large shearing deformation amount of the movement amount equal to the rubber layer 1 of the sole plate 8, it is possible to effectively damp vibrations of the girder 7. The upper metal plate 3 of the rubber bearing 4 is held so as not to move in the bridge axis direction with respect to the base plate 6, and the rubber bearing 4 is held.
Since the lower metal plate 2 in is forcedly moved in the bridge axis direction by an amount equal to the amount of movement of the sole plate 8 in the bridge axis direction, after the vibration due to the earthquake ends, the rubber layer 1 of the rubber support 4 is Shear deformation can be eliminated automatically.

[Brief description of drawings]

1 to 6 show a first embodiment of the present invention. FIG. 1 is a side view of a seismic isolation rubber bearing device, FIG. 2 is a front view thereof, and FIG. 3 is FIG. Fig. 4 is a perspective view of the seismic isolation rubber bearing device, Fig. 5 is a perspective view showing the rubber bearing body and each part attached thereto, and Fig. 6 is a perspective view of the seismic isolation rubber bearing device. It is a side view which shows a use condition. 7 to 11 show a second embodiment of the present invention. FIG. 7 is a side view of the seismic isolation rubber bearing device, FIG. 8 is its front view, and FIG. 9 is FIG. FIG. 10 is a perspective view of the seismic isolation rubber bearing device, and FIG. 11 is a perspective view showing the rubber bearing body and each part attached thereto. FIG. 12 is a partially longitudinal side view showing a conventional sliding movement type rubber bearing device. In the figure, 1: rubber layer, 2: lower metal plate, 3: upper metal plate, 4: rubber support, 5: lower structure, 6: base plate, 7: bridge girder, 8:
Sole plate, 9: Pressed protrusion, 10: Pressed protrusion, 11: Upper metal plate movement prevention engagement member, 12: Pressed protrusion, 13: Pressed protrusion, 14: Engagement protrusion, 15: Upper metal plate movement prevention For locking protrusion,
16: ridge, 17: engaging protrusion, 18: lower movable sliding plate, 19: upper fixed sliding plate, 20: locking protrusion, 21: lower fixed sliding plate, 22: anchor member, 23: engaging groove, 24 : Upper movable sliding plate, 25: Anchor rod.

Claims (3)

[Claims] 1. A rubber bearing 4 comprising a rubber layer 1 and a lower metal plate 2 and an upper metal plate 3 integrally connected to the rubber layer 1.
A base plate 6 fixed to the lower structure 5 and a sole plate 8 fixed to the bridge girder 7 are slidably interposed, and the lower metal plate 2 and the sole plate 8 relatively move in the bridge axial direction. 1. A seismic isolation rubber bearing device in which the upper metal plate 3 and the base plate 6 are engaged with each other so as not to move relative to each other in the bridge axis direction. 2. A rubber bearing 4 comprising a rubber layer 1 and a lower metal plate 2 and an upper metal plate 3 integrally connected to the rubber layer 1.
Slidingly interposed between a base plate 6 fixed to the lower structure 5 and a sole plate 8 fixed to the bridge girder 7, on both sides of the lower metal plate 2 in the direction perpendicular to the bridge axis,
Plural pressed protrusions 9 arranged at intervals in the bridge axis direction
Are integrally provided, and at both ends in the bridge axis direction on both sides of the sole plate 8 in the direction perpendicular to the bridge axis, there are provided pressing protrusions 10 that engage with the outer end surfaces of the pressed protrusions 9 in the bridge axial direction,
The central portion of the base plate 6 on both sides in the direction perpendicular to the bridge axis and the central portion of the upper metal plate 3 on both sides in the direction perpendicular to the bridge axis are provided with upper metal plate movement preventing engagement members 11. A seismic isolation rubber bearing device which is engaged so as not to move relatively in the axial direction of the bridge. 3. A rubber bearing 4 comprising a rubber layer 1 and a lower metal plate 2 and an upper metal plate 3 integrally connected to the rubber layer 1,
It is slidably interposed between a base plate 6 fixed to the lower structure 5 and a sole plate 8 fixed to the bridge girder 7, and is pressed to the center portion of the sole plate 8 on both sides in the direction perpendicular to the bridge axis in the direction perpendicular to the bridge axis. The protrusions 12 are integrally provided, and the pressed protrusions 13 engaged with both sides of the pressing protrusions 12 in the bridge axis direction are integrally formed at intermediate portions in the bridge axis direction of the lower metal plate 2 on both sides in the direction perpendicular to the bridge axis. A plurality of engaging projections 14 are provided integrally on both sides of the upper metal plate 3 in the direction perpendicular to the bridge axis, and are provided integrally with each other at a distance in the bridge axis direction. 2. A seismic isolation rubber bearing device in which locking projections (15) for preventing movement of an upper metal plate that engage with the outer end surfaces of the engaging projections (14) in the bridge axis direction are integrally provided at both ends in the bridge axis direction.