JP3390982B2 - Rubber bearing body movement restriction device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure support for civil engineering and construction, and more particularly to a rubber support used for supporting a bridge on a pier, and more specifically to moving a structure in a predetermined direction. The present invention relates to a device for restricting the movement of a rubber bearing that allows the movement.

[0002]

2. Description of the Related Art Conventionally, as a supporting member for a structure for civil engineering and construction, a rubber bearing which is arranged between an upper structure and a lower structure in the structure has been generally adopted, and usually, When a horizontal force is applied to the structure due to an earthquake or the like, a predetermined amount of relative movement is allowed to prevent the structures from being destroyed. A movement limiting device is used in order to prevent the rubber bearing from being broken when a displacement larger than the designed movement amount is about to occur due to a large earthquake or the like. An example of such a movement restricting device for a rubber bearing is shown in FIG. Basically, a rubber bearing main body 21 constituted by alternately laminating a metal plate having upper flanges 33 and lower flanges 22 fixed to the upper and lower parts and a rubber layer is used to form an upper structure such as a bridge 29 and a bridge pier 35. It is arranged between a lower structure such as a bridge and supports a large weight upper structure such as a bridge.
The upper structure side of the bridge 29, etc. is located at the bottom of the bridge 29.
4. The set plate 27, which is a connecting tool, is connected and fixed by interposing the sole plate 25.

On the other hand, the lower structure side of the pier 35 or the like is connected to the lower gear 2 via the anchor bolt 26 embedded in the pier 35 or the like.
3 is fixed, and the rubber bearing body 21 is placed on the lower shoe 23. A part of both side surfaces parallel to the bridge axis is erected on the lower shoe 23, and a side block 30 is fixed to the erected surface 34 by a side block bolt 31. The side block 30 has an inverted L-shaped cross section, as shown in FIG.
3A is a cross-sectional view taken along the line D-D of FIG. 3A and FIG.
As is clear from (C), it is in contact with the upper surface of the upper shoe 24 of the upper structure. Therefore, the side block 30 restrains the step 32 of the upper shoe 24 when the upper structure is lifted up with respect to the lower structure mainly due to the upper lift force generated by the earthquake. On the other hand, as is clear from FIGS. 3 (A) and 3 (B), in order to prevent the rubber bearing main body 21 from being broken when the seismic force F such as an arrow generated by a large earthquake or the like is generated, the side block 30 Between the side face 30A in the bridge axis direction and the inner side face 24A provided slightly inside the side end of the upper shoe 24, a movement limit allowance S for limiting the amount of movement allowed in the bridge axis direction to a predetermined amount. 'Is provided. 28 is
A shear key inserted between the rubber bearing main body 21 and the upper structure and the lower structure for transmitting a shearing force at least in the bridge axial direction.

In such a conventional movement restricting device for a rubber bearing, as shown in the schematic view of FIG. 4, the side surface of the side block fixed to the inner side surface 24A of the upper shoe 24 and the upright surface 34 of the lower shoe 23. The movement restriction unit is configured with 34A. Figure 4
In the normal state of (A) and (B), the distance S ′ provided between the inner side surface 24A of the upper shoe 24 and the side surface 34A of the side block fixed to the upright surface 34 of the lower shoe 23 is as shown in FIG. ),
As shown in (D), the upper shoe 24 on the upper structure side moves horizontally due to a seismic force such as a large earthquake, and the inner side surface 24A of one upper shoe 24 and the side surface 34A of the upright surface 34 of the lower shoe 23 contact each other. Contact, and further displacement is limited. Therefore, in such a movement restricting device, the upper shoe 24 and the lower shoe 23 are
Was an essential configuration requirement.

[0005]

As described above, as a rubber support for supporting an upper structure such as a bridge to a lower structure such as a bridge pier, a rubber support for the lower structure due to a horizontal force generated by an earthquake or the like is used. In the conventional rubber bearings that restrict the excessive movement of the upper structure, it is necessary to give the upper shoe and the lower shoe a function to limit the movement.Therefore, these rubber bearings of the upper shoe and the lower shoe are supported. Not only a large number of parts other than the main body are required, but also the shapes of these parts themselves are complicated, and the total weight and size for that purpose are increased, resulting in an increase in cost. Moreover, in these conventional movement restricting devices for rubber bearings, once the upper structure, the lower structure, and the rubber bearing are installed, the movement restriction allowance between them cannot be changed. The degree was limited. Therefore, the present invention solves the problems associated with the conventional movement restricting device for a rubber bearing, and simplifies without requiring a special member that is fixed to the rubber bearing to constitute the movement restricting member. (EN) Provided is a compact and inexpensive movement restricting device for a rubber bearing, which can realize movement restriction by the structure described above and can freely and easily adjust the movement restriction amount even after installation.

[0006]

Therefore, in the present invention, a metal plate and a rubber layer are installed between the upper structure and the lower structure so as to allow movement in at least a predetermined direction between these structures. In a movement restricting device for a rubber bearing, wherein upper and lower portions of a rubber bearing body constituted by alternately laminating are integrally fixed with an upper flange and a lower flange,
It is characterized in that a frame-shaped limiting jig surrounding the periphery of the rubber bearing main body and provided with a predetermined movement limiting margin in at least a predetermined direction is movably arranged. Further, the present invention is characterized in that the allowance of movement of the limiting jig with respect to the rubber bearing main body can be adjusted so that at least the movement limiting margin in the predetermined direction can be adjusted. Further, the present invention is characterized in that the limiting jig is configured to be disassembled. Further, in the present invention, the upper structure is a bridge, the lower structure is a pier, and the predetermined direction is a bridge axis direction.

[0007]

According to the present invention, by the above-mentioned means, the excessive horizontal displacement caused by the horizontal force F due to a large earthquake or the like surrounds the rubber bearing main body 1 and at least the predetermined movement limit S in at least the predetermined direction. This is effectively prevented by the limiting jig 6 arranged with a clearance of / 2. Further, according to the present invention, since the allowance of movement of the limiting jig 6 with respect to the rubber bearing main body 1 can be adjusted, at least the movement limiting allowance in the predetermined direction can be adjusted. Therefore, the upper structure 13 and the lower structure 14 Even after the rubber bearing main body 1 is installed, the movement restriction allowance can be changed by adjusting the attachment position of the limiting jig 6 independently of the upper structure 13 and the rubber bearing main body 1. , The degree of freedom increases. Further, in the present invention, since the restricting jig 6 is configured to be disassembled, even after the upper structure 13, the lower structure 14 and the rubber bearing body 1 are installed, the restricting jigs having different sizes are restricted. By newly assembling the tool 6, it is possible to adjust the clearance between the limiting jig 6 and the rubber support body 1. It is also possible to replace the support 1 with a new one by removing the limiting jig 6. In addition, since it is possible to move in the direction in which there is a gap, it is difficult to realize with conventional upper and lower shoes by adopting the gap in all directions. Construction is possible. Then, it may be installed without providing a gap in a direction that does not require movement.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an embodiment of a movement restricting device for a rubber bearing of the present invention, FIG. 1 (A) is a plan view, FIG. 1 (B) is a sectional view taken along line AA of FIG. 1 (A), and FIG. 1 (C). FIG. 3 is a sectional view taken along line BB of FIG. In this example, a bridge is used as the upper structure,
Although a bridge pier will be described as an example of the lower structure, the present invention is not limited to the bridge structure, and is applied to many structures such as civil engineering and buildings. A metal plate and a rubber are provided between the upper structure such as the bridge 13 and the lower structure such as the bridge pier 14 in order to allow at least movement between these structures (13, 14) in a predetermined direction (bridge axis direction in the embodiment). A rubber bearing body 1 formed by integrally fixing an upper flange 3 and a lower flange 2 to each other is arranged on the upper portion and the lower portion of a rubber bearing main body 1 configured by alternately laminating layers. The bridge 13
And the upper flange 3 of the rubber bearing body 1 are the set bolt 1
Fixed by 2. A frame-shaped restricting jig 6 is movably arranged so as to surround the rubber bearing main body 1 and to provide at least a half of the predetermined movement restriction margin S in at least a predetermined direction (bridge axis direction). The limiting jig 6 is the pier 1
The rubber bearing body 1 is moved in a predetermined direction (bridge axis direction) by being placed on a pair of pressing plates 4 and 4 arranged on both sides in a direction perpendicular to the bridge axis, which are fastened to anchor bolts 5 fixedly embedded in A pair of limit plates 8 arranged on both sides in the bridge axis direction for allowing the movement of the rubber support body 1 and limiting the movement of the rubber support body 1 in the direction orthogonal to the predetermined direction (the direction perpendicular to the bridge axis).
A holding plate 4 having a lower portion 8 and fixed to the lower portion of the limiting plate 8 holds the lower flange 2 of the rubber bearing body 1 to the pier 14.

Both side surfaces 1 of the rubber bearing body 1 in the bridge axis direction
A, 1A and side surfaces 8A on the inner side of the pair of restriction plates 8, 8,
Between 8A and 8A, a clearance of 1/2 of the movement limit allowance S is provided so that the rubber bearing body 1 can be moved in a predetermined direction (bridge axis direction) and the amount of movement can be limited. Limiting guide members 9, 9 having a planar triangular shape are provided on both side ends of the pair of limiting plates 8, 8. The limiting guide member 9
Is a pair of upper and lower triangular plate members that are connected to each other and are vertically arranged to limit the movement of the rubber support body 1 in a direction orthogonal to a predetermined direction (a direction perpendicular to the bridge axis). 9A, and a limit amount adjusting bolt 10 for adjusting the relative distance between the pair of limiting plates 8 in the space surrounded by the pair of upper and lower triangular plate bodies and the guide portion 9A. Inserted and placed. Even after the bridge 13 and the bridge pier 14 and further the rubber bearing body 1 are installed, the relative distance between the pair of limiting plates 8 and 8 can be kept from the bridge 13 and the rubber bearing body 1 by the rotation of the limiting amount adjusting bolt 10. Can be adjusted independently. Reference numeral 11 denotes a limit amount adjusting nut screwed into the limit amount adjusting bolt 10. Further, the guide portions 9A of the pair of limiting guide members 9 for limiting the movement of the rubber bearing body 1 in the direction orthogonal to the prescribed direction (the direction perpendicular to the bridge axis) are provided with the guide portions 9A when the rubber bearing body 1 moves in the prescribed direction. The side surface of the rubber bearing main body 1 in a direction orthogonal to the predetermined direction can be smoothly guided, and a strong structure composed of the pair of upper and lower triangular plate members and the guide portion 9A makes the bridge shaft perpendicular direction. Of the rubber bearing body 1 is not exposed to the side surface of the rubber bearing body 1 in the direction perpendicular to the bridge axis, and the side surface is not damaged when the rubber bearing body 1 is moved. .

The rubber bearing body movement restricting device having the above-described structure is, as schematically shown in FIG.
Inner side surface 8 of the limiting plate 8 in the limiting jig 6 and the side surface 1A of the
A and A constitute a movement restricting unit, and the distance S between them is 1 /
2 constitutes the movement restriction fee. 2A and 2B, the distance S between the side surface 1A of the rubber bearing main body 1 and the inner side surface 8A of the limiting plate 8 in the limiting jig 6 is equal to that in FIG.
As shown in (C) and (D), the upper structure side moves horizontally due to a seismic force such as a large earthquake, and the upper end of one side surface 1A of the rubber bearing main body 1 and the limiting plate 8 of the limiting jig 6 The inner side surface 8A comes into contact with the inner side surface 8A, and further displacement is limited. Thereafter, as shown in FIGS. 2 (E) and 2 (F), the rubber bearing main body 1 is moved to the opposite side by vibration, and the following steps are repeated. As described above, the excessive horizontal displacement caused by the horizontal force due to a large earthquake or the like is caused by the limiting jig 6 arranged around the rubber bearing main body 1 with a predetermined movement limiting margin in at least a predetermined direction. Effectively prevented ,. Further, according to the present invention, since the position of the limiting jig 6 with respect to the rubber bearing main body 1 can be adjusted, at least the movement limiting margin in the predetermined direction can be adjusted. Therefore, the upper structure, the lower structure, and the rubber can be adjusted. Even after the support body 1 is installed, by adjusting the mounting position of the limiting jig 6 independently of the upper structure and the rubber support body,
The movement restriction allowance S can be changed, and the degree of freedom is increased.

The embodiments of the present invention have been described above.
The structure of the restricting jig, the structure of the restricting plate and the combination thereof, the structure of the restricting guide member and the like are appropriately designed within the scope of the present invention. Further, instead of the limiting amount adjusting bolt for adjusting the interval between the pair of limiting plates, a turnbuckle or other appropriate one may be adopted. Further, in order to facilitate the movement of the pair of limiting plates during adjustment, a guide member constituted by a combination of a protrusion and a dovetail groove is provided between the limiting plate and the pressing plate or the lower structure. Good. In addition, a cushioning member or the like may be arranged between the side surface of the rubber bearing body and the side surface of the limiting plate to prevent damage when the movement of the rubber bearing body is restricted. Furthermore, in the present invention, an excessive horizontal displacement is effectively prevented by a restricting jig arranged around the rubber bearing main body with a predetermined movement restricting margin in at least a predetermined direction. Accordingly, it is possible to allow the movement in the direction orthogonal to the predetermined direction (the direction perpendicular to the bridge axis in the embodiment) and to limit the movement by providing a movement limiting margin.

[0012]

As described in detail above, according to the present invention, an excessive horizontal displacement caused by a horizontal force due to a large earthquake or the like surrounds the rubber bearing main body and causes a predetermined amount in at least a predetermined direction. It is effectively prevented by the limiting jig arranged with a clearance of 1/2 of the movement limiting margin. Further, since the allowance for movement of the limiting jig with respect to the rubber bearing main body can be adjusted, at least the movement limiting allowance in the predetermined direction can be adjusted. Therefore, after the upper structure and the lower structure and further the rubber bearing main body are installed, Also, by adjusting the mounting position of the limiting jig independently of the upper structure and the rubber bearing body, the movement limiting margin can be changed, and the degree of freedom is increased. Furthermore, since the limiting jig is configured to be disassembled,
Even after the upper structure, the lower structure, and the rubber bearing body are installed, the clearance between the limiting jig and the rubber bearing body can be adjusted by newly assembling the limiting jigs of different sizes. It is also possible to replace the support 1 with a new one by removing the limiting jig 6. In addition, since it is possible to move in the direction in which the play space is open, by adopting the play space in all directions, it is difficult to realize with the conventional upper and lower shoes, and support with movement restriction is provided. Construction is possible. Furthermore, a pair of limiting plates that allow the rubber bearing main body to move in a predetermined direction to limit the amount of movement thereof and to limit the movement of the rubber bearing main body in a direction orthogonal to the predetermined direction is a rubber bearing main body. When moving in the direction, the side surface of the rubber bearing main body in the direction orthogonal to the predetermined direction is guided, which has the effect of smoothing the movement in the moving direction. Moreover, since the distance between the pair of limiting plates is adjusted as compared with the conventional one in which the side block or the like is replaced and adjusted, the adjustment amount, that is, the movement limiting allowance can be halved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a movement restricting device for a rubber bearing according to the present invention.

FIG. 2 is a schematic diagram showing the operation of the movement restricting device for a rubber bearing according to the present invention.

FIG. 3 is a view showing a conventional movement restricting device for a rubber bearing.

FIG. 4 is a schematic diagram showing an operation of a conventional movement restricting device for a rubber bearing.

[Explanation of symbols]

1 rubber bearing body 1A Rubber bearing body side 2 Lower flange 3 upper flange 4 holding plate 5 anchor bolts 6 Limiting jig 8 limit plate 8A Limit plate side 9 Restriction guide member 9A guidance section 10 Limit adjustment bolt 11 Limit adjustment nut 12 set bolts 13 Upper structure (bridge) 14 Lower structure (pier) F Horizontal force S movement limit fee

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Claims (4)

(57) [Claims] 1. A rubber bearing main body which is installed between an upper structure and a lower structure so as to allow at least movement between these structures in a predetermined direction, and which is constituted by alternately laminating metal plates and rubber layers. In a movement restricting device for a rubber bearing, in which an upper flange and a lower flange are integrally fixed to the upper part and the lower part, respectively, a frame shape surrounding a periphery of the rubber bearing body and providing a predetermined movement restricting margin in at least a predetermined direction. A movement restricting device for a rubber bearing, wherein the restricting jig is arranged so as to be movable. 2. The structure according to claim 1, wherein the allowance of movement of the limiting jig with respect to the rubber bearing main body is adjustable so that at least the movement limiting allowance in the predetermined direction can be adjusted. Movement limiter for rubber bearings. 3. The movement restriction device for a rubber bearing according to claim 1, wherein the restriction jig is configured to be disassembled. 4. The movement restricting device for a rubber bearing according to claim 1, wherein the upper structure is a bridge, the lower structure is a bridge pier, and the predetermined direction is a bridge axis direction.