JP4407307B2 - Rubber laminated damper device for bridges - Google Patents

Description

  The present invention relates to a rubber laminated damper device for a bridge. More specifically, in a damper device composed of a shear deformation damping member and a vertical load support member, shear deformation in the bridge axis direction is absorbed while absorbing the rotation of the upper structure. The present invention relates to a rubber laminated damper device for bridges.

  Conventionally, as a structure of a rubber laminated damper device for bridges, a vertical load support member that supports the vertical load of the upper structure is installed between the lower structure such as the pier or abutment and the upper structure such as the flange of the bridge girder. And what installed the shear deformation attenuation | damping member comprised by alternately laminating | stacking a hard board and a rubber-like elastic board on the both sides | surfaces of superstructures, such as a flange, is known (for example, refer patent document 1).

  In the case of such a conventional structure, when a shear load from the horizontal direction acts on the shear deformation damping members installed on both sides of the upper structure such as a flange, one receives a compressive load and the other receives a tensile load. Thus, since this tensile load always acts, there is a problem that the durability of the rubber laminated damper device is lowered.

  In addition, a sliding bearing that supports the vertical load so that the upper structure is movable in the horizontal direction, and the upper structure is subjected to shear deformation in all directions in the horizontal direction without supporting the vertical load of the upper structure. A function-separated bridge support device that includes a horizontal load support mechanism having an elastic body that supports the horizontal load of a structure has also been proposed (see, for example, Patent Document 2).

However, such a horizontal load support mechanism has a problem in that the structure is complicated and tends to increase in size, and the manufacturing cost increases accordingly.
JP 2001-182013 A JP 2002-38418 A

  This invention pays attention to such a conventional problem, and provides a rubber laminated damper device for a bridge that can be made a compact device with a simple structure by configuring the vertical load to be received only by the vertical load support member. It is for the purpose.

In order to achieve the above object, the present invention provides, between a sole plate fixed to the lower part of the upper structure and a base plate fixed to the lower structure,
(A) a shear deformation damping member in which a plurality of hard plates and rubber-like elastic plates are alternately laminated , and integrally formed by providing upper and lower ridges on the upper and lower portions of the laminate;
When
(B) a vertical load support member for supporting a vertical load of the upper structure;
In bridges rubber laminated damper device formed by installing the door, between the upper surface of the lower surface and the vertical load bearing member of said sole plate, with the interposition of rotational absorbing means for absorbing the rotation of the superstructure, The vertical load support member is disposed on both sides of the shear deformation damping member in a direction perpendicular to the bridge axis, and the height of the vertical load support member is higher than the height of the shear deformation attenuation member; A gap is provided between the upper end of the shear deformation damping member and the shear deformation attenuating member .

Here, in the rubber laminated damper device for a bridge according to the present invention, it is preferable that the upper plate of the shear deformation damping member and the sole plate are engaged with each other by a shear key. Still further preferably, when the shear key is fitted into the shear key hole, the shear key and the shear key hole are formed such that a gap is formed between the shear key hole and a side surface and an upper surface of the shear key. It is configured. That is, the upper part of the shear deformation damping member and the sole plate of the upper structure are engaged by a shear key so that the horizontal action of the upper structure is attenuated only by the shear deformation of the shear deformation attenuation member. It is a thing.

  Further, the rotation absorbing means is configured such that the contact surface between the vertical load support member and the sole plate of the superstructure is in a line or point contact shape, is slidable on the corresponding contact surface, and is wear resistant. Hard metal material is used.

  Thus, in the rubber laminated damper device for a bridge according to the present invention, the rotation absorbing means for absorbing the rotation of the upper structure is interposed between the lower surface of the sole plate and the upper surface of the vertical load support member. The vertical load is configured to be received only by the vertical load support member, and only the shear deformation is applied in the direction of the bridge axis while absorbing the rotation of the upper structure without applying the vertical reaction force and the tensile force to the shear deformation damping member. It is a thing.

  As described above, since the present invention is constructed by interposing the rotation absorbing means for absorbing the rotation of the upper structure between the lower surface of the sole plate and the upper surface of the vertical load support member, the structure is simple and compact. It can be made into a device, the manufacturing cost is low, and the vertical load is received only by the vertical load support member, absorbing the rotation of the upper structure without applying vertical reaction force and tensile force to the shear deformation damping member However, there is an effect that only shear deformation can be given in the direction of the bridge axis.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a front view in a bridge axis direction of a rubber laminated damper device for a bridge showing an embodiment of the present invention, FIG. 2 is an explanatory view of a portion X in FIG. 1 viewed from a direction perpendicular to the bridge axis, and 1 is a pier Alternatively, a lower structure 2 such as an abutment 2 indicates an upper structure such as a bridge girder. A vertical structure comprising a shear deformation damping member 3 and an iron block that supports the vertical load of the upper structure 2 is provided on the lower structure 1. A damper device 5 comprising a load support member 4 is installed.

  The shear deformation attenuating member 3 has a plurality of hard plates 6 and rubber-like elastic plates 7 alternately laminated, and upper and lower ridges 8 and 9 are integrally provided at the upper and lower portions thereof. The lower rod 9 of the damper device 5 is fixed with bolts and fixed to the lower structure 1 with a plurality of anchor bolts 10 via the base plate 15, and above the vertical load support member 4 and the upper rod 8. The sole plate 11 fixed to the lower part of the upper structure 2 is arranged.

  The vertical load support members 4 are arranged on both sides of the shear deformation attenuation member 3 in the direction perpendicular to the bridge axis, and the height H is formed higher than the height h of the shear deformation attenuation member 3 to provide a gap S. The vertical load of the upper structure 2 is configured not to act directly on the shear deformation damping member 3.

  Further, the upper collar 8 of the shear deformation attenuating member 3 and the sole plate 11 of the upper structure 2 are fitted into a shear key hole 12a formed at a position facing the center of the upper collar 8 and the sole plate 11. And a gap 17 is formed between the shear key hole 12a and the side surface and the upper surface of the shear key 12, so that the upper structure 2 is always subjected to slight horizontal movement, for example, bending. The horizontal load caused by the large horizontal movement at the time of an earthquake is caused by the upper rod 8 and the sole plate 11 being engaged through the shear key 12 by allowing the bridge axis to expand and contract due to rotation, temperature change, etc. The shear deformation attenuation member 3 is transmitted to the shear deformation attenuation member 3 and can be attenuated by deformation of the shear deformation attenuation member 3.

  In addition, a shear key 12 that fits into a shear key hole 12a formed at a position opposite to the center part of the lower collar 9 and the base plate 15 of the shear deformation attenuating member 3 is disposed and functions in the same manner as described above. .

  Between the sole plate 11 of the upper structure 2 and the vertical load support member 4, a rotation absorbing means 13 for absorbing the rotation of the upper structure 2 in the bridge axis direction is interposed.

  In the embodiment of the present invention, the rotation absorbing means 13 is slidable on the contact surface G between the vertical load support member 4 and the sole plate 11 and wear-resistant hard metal materials 14a and 14b (for example, carbon Steel, nickel chrome molybdenum steel, etc.), and the upper end contact portion Ga of the vertical load support member 4 has a predetermined radius R so as to be in line contact or point contact with the sole plate 11, as shown in FIG. Are formed in a circular curved surface.

  With this configuration, the vertical load of the upper structure 2 is always received by the vertical load support member 4, and when a horizontal load acts on the upper structure 2, the sole plate 11 is attached to the vertical load support member 4. The upper end contact portion Ga slides smoothly, and no vertical load acts on the shear deformation damping member 3, and the horizontal load is attenuated by the shear deformation of the shear deformation attenuation member 3 engaged with the sole plate 11 by the shear key 12. It is something to be made.

It is a front view of a bridge axis direction of a rubber laminated damper device for bridges showing an embodiment of this invention. It is explanatory drawing which looked at the X section of FIG. 1 from the bridge axis orthogonal direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Substructure 2 Upper structure 3 Shear deformation damping member 4 Vertical load support member 5 Damper device 6 Hard plate 7 Rubber-like elastic plate 8 Upper rod 9 Lower rod 11 Sole plate 12a Shear key hole 12 Shear key 13 Rotation absorbing means 14a , 14b Wear-resistant hard metal material 15 Base plate 17 Gap G Abutting surface Ga Upper end abutting portion of vertical load support member R Radius H Height of vertical load support member h Height of shear deformation damping member S Gap

Claims (5)

Between the base plate which is fixed on a sole plate and a lower structure which is fixed to the lower portion of the upper structure, and a plurality of hard plates and rubber-like elastic plates are laminated alternately, the upper and lower portions of the stack shear deformation suppression member that is integrally formed by providing the upper and lower shoes, in bridges rubber laminated damper device formed by installing a vertical load supporting member for supporting the vertical load of the upper structure,
Between the upper surface of the lower surface and the vertical load bearing member of said sole plate, wherein together with the interposition of rotational absorbing means for absorbing the rotation of the upper structure, the vertical load bearing members bridge axis perpendicular of the shear damping member The vertical load support member is disposed on both sides in the direction, and the height of the vertical load support member is higher than the height of the shear deformation damping member, and a gap is provided between the sole plate and the upper arm of the shear deformation damping member. A rubber laminated damper device for bridges. The rubber laminated damper device for a bridge according to claim 1 , wherein the upper plate of the shear deformation damping member and the sole plate are engaged by a shear key. The shear key and the shear key hole are configured so that a gap is formed between the shear key hole and a side surface and an upper surface of the shear key when the shear key is fitted into the shear key hole. The rubber laminated damper device for bridges according to claim 2 . It said rotary absorbing means, bridges rubber laminated damper device according to claim 1, 2 or 3 configured in a shape to contact surface lines or point contact with the vertical load supporting member and the sole plate. Said rotary absorbing means, bridges according to the slidable in contact surface between the vertical load supporting member and the sole plate, and claims 1, 2, 3 or 4 was used wear-resistant hard metal material Rubber laminated damper device for use.

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