JP2005113512A - Rubber bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a function complement type rubber bearing device capable of increasing a rotational function without lowering vertical rigidity in a horizontal force dispersion bearing device and being compacted at a low cost. <P>SOLUTION: A through-hole 19 is formed in the approximately central part of a plane of a first bearing body 6, and a shear key 20 engaged with a sole plate 15 put on the lower part of a bridge girder 13 at a predetermined interval X and an abutting plate 5 is inserted inside of an internal wall surface 19a in the longitudinal direction of the through-hole 19. Since the shear key 20 is not confined to one, a plurality of shear keys can be also used, and in this case, it is favorable that the through-hole 19 can be equally placed in the plane of the first rubber bearing body 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rubber bearing device used for a bridge or the like, and more specifically, in a horizontal force distribution bearing device, the rotational function is improved without lowering the vertical rigidity, and further, a compact and inexpensive function-complementary rubber bearing device. It is about.

  Conventionally, a rubber bearing device has been used as a horizontal force dispersion bearing for multi-span continuous girders. This rubber bearing device has the characteristics that the rigidity in the vertical direction is large and the rigidity in the horizontal direction is small. The horizontal load is distributed to each fulcrum by shear deformation in the horizontal direction when the bridge girder moves due to temperature change or during an earthquake.

  However, since the rubber bearing device as described above has a larger bearing area than the metal bearing device, it is difficult to follow the rotation due to vertical deflection, and this tendency is particularly large in large reaction force bearings with a large bearing area. Thus, when the rotational performance of the rubber bearing is poor, there is a problem that repeated tensile stress acts on the set bolt connecting the rubber bearing and the bridge girder and fatigue fracture is likely to occur.

Thus, a bridge support device has been proposed that takes advantage of a rubber support suitable for horizontal force dispersion by shear deformation and solves a weak point in rotational performance (see, for example, Patent Document 1).
This bridge bearing device is a bearing device installed between a pier or an abutment and a bridge girder, and includes a sealed rubber bearing plate bearing having a rotation function without reducing vertical rigidity, and this sealed rubber bearing plate. The seal ring that constitutes the bearing is subject to intrusion of water, sand, etc. along with deterioration in function due to repeated compression fatigue after long-term use. As a result, the metal member rusts and adheres to the rubber flow path, which hinders the flow function of the built-in rubber plate, and a stable rotation performance cannot be obtained.

Also, since the bolts that fix the frame of the sealed rubber support plate support, the ring projections provided on the frame and the upper collar are metal members, it is said to be inferior in impact resistance against upward tensile force during an earthquake. There was a problem, and there was a problem that the structure was complicated and expensive.
Japanese Patent Laid-Open No. 11-303016 (pages 2 to 4 and FIG. 1)

  This invention pays attention to such conventional problems, and aims to provide a function-complementary type rubber bearing device that improves the rotation function without lowering the vertical rigidity in the horizontal force dispersion bearing device, and is further compact and inexpensive. To do.

  In order to achieve the above-mentioned object, the present invention provides a vertical reaction force support function for a bridge girder and a bridge girder via a contact plate on a second rubber bearing body having a shear deformation function composed of a laminate of a hard plate and an elastic rubber layer. In the rubber bearing device formed by integrally laminating the first rubber bearing body having the rotation absorbing function, at least one through hole is formed in the first rubber bearing body, and the through hole is formed in the through hole. The gist of the invention is that a shear key that engages with a sole plate attached to a lower portion of the bridge girder and the contact plate is inserted.

  Here, the first rubber support is an elastic rubber layer alone, or a laminate of a hard plate and an elastic rubber layer, and a longitudinal inner wall surface of the through hole and a longitudinal side surface of the shear key. A gap is provided between them.

  In addition, an arcuate curved surface that bulges the inner wall surface in the longitudinal direction of the through-hole into an arcuate curved surface that bulges outward, and bulges the side surface in the longitudinal direction outward with a predetermined gap in the through-hole It is also possible to insert a shear key formed in the above and a rubber-like elastic body interposed in the gap.

  In this manner, at least one through hole is formed in the first rubber support body, and a shear key that engages with the sole plate and the abutment plate attached to the lower part of the bridge beam is inserted into the through hole. With this configuration, the rotation function can be improved without reducing the vertical rigidity.

  The present invention provides a vertical reaction force support function of a bridge girder and a rotation of the bridge girder via a contact plate on the second rubber bearing body having a shear deformation function composed of a laminate of a hard plate and an elastic rubber layer as described above. In a rubber bearing device configured by integrally laminating a first rubber bearing body having an absorption function, at least one through hole is formed in the first rubber bearing body, Since the shear key that engages the sole plate attached to the lower part of the bridge girder and the abutment plate is inserted, the rotation function can be improved without lowering the vertical rigidity, and the structure can be made more compact and simple. There is an effect that an inexpensive function-complementary rubber bearing device can be obtained.

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

  FIG. 1 is a half sectional view of a rubber bearing device in a direction perpendicular to the bridge axis in the first embodiment of the present invention, FIG. 2 is a sectional view taken along the line A-A of FIG. A first girder having a vertical reaction force supporting function for a bridge girder and a rotation absorbing function for a bridge girder via a contact plate 5 on a second rubber bearing body 4 having a shear deformation function composed of a laminate 3 of a rubber layer 2 and an elastic rubber layer 2. The rubber support 6 is integrally laminated.

  A lower rivet 7 is attached to the lower part of the laminated body 3 of the second rubber bearing body 4, and a base plate 9 fixed to the lower surface of the lower heel 7 by a shear key 8 and welding or the like is connected to an pier 11 via an anchor bolt 10. Or it is fixed to the abutment. An upper rod 12 is mounted on the first rubber bearing 6, and a sole plate 15 welded to the lower flange 14 of the bridge girder 13 is disposed on the upper rod 12 via a plurality of set bolts 16. It is fixed.

  Side blocks 17a and 17b with which the contact plate 5 contacts are fixed via a plurality of bolts 18 on the base plates 9 on both sides of the second rubber support 4 in the direction perpendicular to the bridge axis. The displacement of the support 4 in the direction perpendicular to the bridge axis is constrained.

  A through hole 19 is formed in the approximate center of the plane of the first rubber bearing body 6, and is attached to the lower part of the bridge girder 13 with a predetermined gap X in the inner wall surface 19 a in the longitudinal direction of the through hole 19. A shear key 20 that engages with the sole plate 15 and the contact plate 5 is inserted. The shear key 20 prevents the first rubber support body 6 from undergoing shear deformation and has a vertical reaction force support function and a rotation absorption function of the bridge girder, and is not limited to one, but uses a plurality of shear keys. In this case, it is desirable that the through holes 19 are evenly arranged in the plane of the first rubber support 6.

  The first rubber bearing body 6 in the first embodiment is constituted by the elastic rubber layer 2 alone, but as shown in the half sectional view of the rubber bearing device in the direction perpendicular to the bridge axis in FIG. It is also possible to constitute a laminate of the plate 1 and the elastic rubber layer 2. When the elastic rubber layer 2 is a single body, the vertical rigidity is relatively small and the rotation function is improved. In the case of a laminate of the hard plate 1 and the elastic rubber layer 2, the vertical rigidity is relatively large. On the other hand, since the rotational performance is reduced, the configuration of the first rubber bearing 6 is appropriately selected depending on the application in which the rubber bearing device is installed (for example, a building such as a bridge, a building, or a house), the support weight, and the like. The

  In consideration of the balance between vertical rigidity and rotational performance, the elastic rubber layer is preferably a single body and a laminate of elastic rubber layers 2 to 4 and hard plates 1 to 3 layers.

  Since the first rubber support 6 is made of an elastic rubber layer alone or a laminate of the hard plate 1 and the elastic rubber layer 2 in this way, the impact resistance is improved against the upward tensile force at the time of an earthquake, and it is stable. It has the rotation performance and long life.

  Since other configurations and operations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  FIG. 4 is an enlarged cross-sectional view showing another embodiment in which a rubber-like elastic body 21 is interposed in a gap X between a through-hole 19 and a shear key 20 formed in the first rubber support body 6. By configuring the gap X so that the gap X is filled with the rubber-like elastic body 21 interposed therebetween, it is possible to absorb the backlash of the rubber bearing device and to have a smooth and stable rotation function.

  FIG. 5 is an enlarged cross-sectional view showing another embodiment of the through hole 19 and the shear key 20a formed in the first rubber support 6, and this embodiment is an inner wall surface 19a in the longitudinal direction of the through hole 19. Is formed in an arcuate curved surface that bulges outward, and a shear key 20a formed in an arcuate curved surface that bulges outward in the longitudinal direction across the predetermined gap Xa is inserted into the through hole 19. It is configured. As described above, even without the rubber-like elastic body 21, the elastic rubber layer of the first rubber support body 6 bulges due to the vertical load, and the gap X of the rubber support device can be absorbed by filling the gap X. It has a smooth and stable rotation function.

  Therefore, in the present invention, it is more preferable to use the embodiment shown in FIGS.

  In this way, at least one or more through holes 19 are formed in the first rubber support body 6, and the sole plate 15 attached to the lower part of the bridge girder 13 with a predetermined gap X therebetween in the through holes 19 and the above-mentioned By adopting a configuration in which the shear key 20 that engages with the abutment plate 5 is inserted, the rotational function can be achieved without interposing the rubber-like elastic body 21 in the gap X without reducing the vertical rigidity of the rubber bearing device. And the entire apparatus can be made compact and simple.

  FIG. 6 is a half sectional view of the rubber bearing device showing another embodiment in which the rubber bearing device is free in the entire circumferential direction. In this embodiment, the second rubber bearing body 4 is The side blocks 17a and 17b as in the first embodiment are not installed. Since other configurations and operations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  Moreover, the horizontal cross-sectional shape of the first rubber bearing body 6 and the second rubber bearing body 4 is circular, quadrangular, or the like (for example, a building such as a bridge, a building, a house, or the like). The first rubber bearing body 6 and the second rubber bearing body 4 can be arbitrarily combined without being limited by the support weight or the like.

It is a half sectional view of the rubber bearing device in the direction perpendicular to the bridge axis in the first embodiment of the present invention. It is AA arrow sectional drawing of FIG. It is a half sectional view of a rubber bearing device in a direction perpendicular to the bridge axis showing another embodiment. FIG. 6 is an enlarged cross-sectional view showing another embodiment in which a rubber-like elastic body is interposed in a gap between a through hole formed in the first rubber support and a shear key. It is an expanded sectional view which shows other embodiment of the through-hole and shear key which were formed in the 1st rubber support body. It is a half sectional view of a rubber bearing device showing another embodiment in which the rubber bearing device is free in the entire circumferential direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hard board 2 Elastic rubber layer 3 Laminated body 4 2nd rubber support body 5 Contact plate 6 1st rubber support body 7 Lower arm 8 Shear key 9 Base plate 10 Anchor bolt 11 Bridge pier 12 Upper arm 13 Bridge girder 14 Lower flange 15 Sole plate 16 Set bolt 17a, 17b Side block 18 Bolt 19 Through hole 19a Inner wall surface 20, 20a Shear key 21 Rubber elastic body X, Xa Gap

Claims (6)

A first rubber bearing having a vertical reaction force support function of a bridge girder and a rotation absorption function of the bridge girder via a contact plate on a second rubber bearing body having a shear deformation function composed of a laminate of a hard plate and an elastic rubber layer. In the rubber bearing device formed by laminating the bodies integrally,
At least one or more through holes are formed in the first rubber support body, and a shear key that engages with a sole plate attached to a lower part of the bridge girder and the contact plate is inserted into the through hole. Characteristic rubber bearing device. The rubber support device according to claim 1, wherein the first rubber support is a single elastic rubber layer or a laminate of a hard plate and an elastic rubber layer. The rubber bearing device according to claim 1 or 2, wherein a gap is provided between an inner wall surface in the longitudinal direction of the through hole and a side surface in the longitudinal direction of the shear key. The rubber bearing device according to claim 3, wherein a rubber-like elastic body is interposed in the gap. The inner wall surface in the longitudinal direction of the through hole is formed into an arcuate curved surface that bulges outward, and the arcuate curved surface in which the side surface in the longitudinal direction bulges outward with a predetermined gap is formed in the through hole. The rubber bearing device according to claim 1, wherein the shear key is inserted. The rubber bearing device according to claim 5, wherein a rubber-like elastic body is interposed in the arcuate gap.

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