JP4365731B2 - Sliding bearing device - Google Patents

Description

  The present invention relates to a sliding support device interposed between an upper structure such as a bridge and a lower structure such as a pier or an abutment.

  Conventionally, as a sliding bearing device, a sliding bearing device provided with a tetrafluoroethylene plate, which is a hard material, on the sliding surface of the supporting device, or a sliding surface of the tetrafluoroethylene plate in the supporting device has a grid shape for preventing adsorption. A sliding support device having a groove is also known. (For example, see Patent Document 1)

  In the case of the sliding support device using the tetrafluoroethylene plate or grooved tetrafluoroethylene plate, the friction coefficient between the tetrafluoroethylene plate and a metal plate such as stainless steel is as low as 0.1, so that the damping performance There is a problem that the upper structure is shaken for a long time.

In order to solve the above-mentioned problem, in order to increase the coefficient of friction and increase the damping performance, as shown in FIG. 15, the elastic bearing body 3 is formed of a laminated rubber bearing body in which the rubber layers 1 and the hard plates 2 are alternately laminated. An elastic support 3 is also known in which the material of the surface portion is a sliding surface 4 made of rubber, and the sliding surface 4 is a flat surface 5. (For example, see Patent Document 2)
Japanese Patent No. 2527684 JP 2003-74013 A

  The material of the surface layer portion in the bearing device is made of rubber, and the elastic bearing body 3 whose sliding surface 4 is a flat surface 5 and whose damping performance is improved is used. For example, as shown in FIG. A mounting-type steel plate 6 is fixed and fixed to a lower structure 7 such as a pier, and a slip-type elastic bearing device 10 in which a flat concrete sliding lower surface 9 of an upper structure 8 made of a concrete girder is supported by a sliding surface 4 is obtained. In this case, the coefficient of friction between rubber and concrete is high, and the entire sliding surface 4 is a single sliding surface that acts as a single unit, which resists friction and is flat in the initial stage when a horizontal force is applied during an earthquake. A slip at the contact interface between the concrete lower surface 9 and the sliding surface 4 does not occur, and the intermediate rubber layer 11 of the rubber bearing body 3 undergoes shear deformation, and the longitudinal deformation shown in FIG. Wear After drawing a while the curve, suddenly, indicating a slip behavior to migrate to the bilinear type of hysteresis curve caused a slip in the sliding surface 4 a flat concrete bottom surface 9. Therefore, the rubber bearing body 3 having the flat sliding surface 4 has a problem that the initial friction coefficient is not stable and the sliding behavior is unstable.

  The present invention provides a sliding bearing device in which the material of the sliding surface of the bearing device is made of rubber, and when a horizontal force is applied to the upper structure, the sliding surface of the rubber and the sliding surface of a concrete material, etc. A sliding bearing that can cause stable sliding behavior at the contact interface, stabilize the coefficient of friction between the sliding surface made of rubber and the sliding surface made of the concrete material, etc., and ensure that damping performance due to sliding is exhibited. An object is to provide an apparatus.

In order to solve the above-mentioned problem advantageously, in the sliding support device of the first invention, the other structure that is interposed between the upper structure and the lower structure and contacts the sliding surface provided in one structure. In the sliding support device having a sliding surface on the side made of a rubber sliding surface, a groove is provided in the rubber sliding surface with a space in the lateral direction, and each of the rubber sliding devices is separated by the groove and behaves independently . A support portion is formed, and the upper surface of each rubber support portion is a slip surface, and each rubber support portion is deformable to swell laterally when subjected to a vertical load of the upper structure. It is characterized by.
In the second invention, in the sliding bearing device of the first invention, the sliding surface provided on the one structure is made of concrete material, steel material, non-ferrous metal material, synthetic resin material, ceramic material, or It is characterized by being a slip surface by any material of carbon compound material.
According to a third aspect of the present invention, in the sliding support device according to the second aspect, the sliding surface made of the non-ferrous metal material is an aluminum sliding surface.
According to a fourth invention, in the sliding bearing device according to any one of the first to third inventions, the groove is provided so as to intersect the sliding direction in the direction of the bridge axis or the direction perpendicular to the bridge axis. To do.
According to a fifth aspect of the invention, in the sliding support device according to any one of the first to fourth aspects of the invention, the groove is a lattice-like groove.
According to a sixth invention, in the sliding support device according to any one of the first to fifth inventions, the groove is formed between a plurality of independent short columnar support portions.
According to a seventh aspect, in the sliding bearing device according to any one of the first to sixth aspects, the sliding bearing device is an elastic sliding bearing device including a laminated rubber bearing body.

According to the first aspect of the present invention, the rubber sliding surface is provided with a groove at a lateral interval, and a plurality of independently supporting rubber support portions partitioned by the groove are formed . The upper surface of the support portion is a sliding surface, and each of the rubber support portions can be deformed so as to swell laterally when subjected to a vertical load of the superstructure. The sliding surface can be formed, and each independent sliding surface is made of rubber, so it can be deformed to the groove side. In the event of an earthquake, the sliding behavior between the rubber sliding surface of the sliding bearing device and the sliding surface of the upper or lower structure can be stabilized.
Further, as in the second invention, the sliding surface provided on the one structure is any one of a concrete material, a steel material, a non-ferrous metal material, a synthetic resin material, a ceramic material, or a carbon compound material. If the sliding surface is made of a material, it can be easily adapted to the site at the time of repairing a new or existing structure or a supporting device thereof.
In particular, in the case of a concrete sliding surface, since the sliding surface can be formed integrally with the upper structure or the lower structure, an inexpensive sliding support device with improved slip damping performance can be obtained.
Furthermore, when a metal sliding surface is used, a stable coefficient of friction can be ensured regardless of the deterioration of the structure even when the bearing is replaced during repair work.
According to the third invention, since the slip surface made of a non-ferrous metal material is made of aluminum, it is lighter and easier to handle than the case of steel and the weather resistance is further improved. As a result, the attenuation performance can be improved.
According to the fourth invention, since the groove is provided so as to intersect the slip direction in the bridge axis direction or the direction perpendicular to the bridge axis, the lateral slip behavior such as the bridge axis direction can be stabilized from the beginning. It is possible to provide a sliding bearing device in which the lateral sliding behavior such as the direction is stable and the damping performance is high.
According to the fifth aspect of the invention, since the lattice-shaped grooves are used, it is possible to stabilize the sliding behavior in the front-rear direction such as the bridge axis direction or the right-and-left direction perpendicular to the bridge axis direction from the beginning. The sliding behavior in the direction can be stabilized, and the sliding bearing device in which the sliding behavior in all lateral directions is stable from the beginning can be obtained.
According to the sixth aspect of the present invention, a groove can be easily formed by simply forming a large number of independent short columnar rubber support portions, and if the support portion is formed into a flat circular shape, There is an advantage that there is no directionality in the direction of.
According to the seventh aspect of the present invention, the sliding on the laminated rubber sliding bearing surface is caused by the horizontal stress at the time of the earthquake, so that the shear deformation amount on the laminated rubber bearing body side is reduced, so that the laminated rubber bearing is damaged. Generation | occurrence | production can be prevented beforehand, the function can be maintained, and durability can be improved more by reducing the amount of shear deformation.
Further, by combining the sliding friction bearing and the elastic bearing, it is possible to provide a sliding friction isolation bearing apparatus in which the elastic bearing has a restoring force with respect to the horizontal force during an earthquake and the sliding friction bearing has friction damping.

  Next, the sliding support device of the present invention will be described in detail with reference to the drawings.

  FIGS. 1 and 6 to 10 show a rubber grooved sliding bearing body 12 according to a first embodiment of the present invention, an elastic bearing device 13 using the same, and its characteristics. First, the structure of the rubber grooved sliding bearing body 12 according to the first embodiment will be described with reference to FIGS. 1 and 6. The elastic bearing body in which the elastic layers made of the rubber layers 1 and the hard plates 2 are alternately laminated. 3, the upper and lower end surfaces are rubber coating layers, and the upper surface, which is a sliding surface, intersects with a number of continuous grooves 14 in the left-right direction (bridge axis direction A) at intervals. In addition, a large number of continuous grooves 15 in the front-rear direction (the direction perpendicular to the bridge axis) are formed to form a lattice-shaped continuous groove. The continuous grooves 14 and 15 are grooves opened on the support side surface.

  Since a large number of independent short columnar support portions 16 are formed by being partitioned by the continuous grooves 14 and 15, the large number of short columnar support portions 16 receive a vertical load from the upper structure. Further, it can be deformed so as to swell laterally, and the vertical load of the upper structure can be dispersed and supported by a number of short columnar support portions 16, and the upper surface of each support portion 16 is a sliding surface 4. As described above, a plurality of independently-behaved slip surfaces can be formed only by providing grooves on the rubber slip surface in the lateral direction, and each independent slip surface 4 is made of rubber. Therefore, since the groove portion can be deformed, it is possible to prevent the entire sliding surface having one large area from integrally acting as in the conventional case and to stabilize the friction coefficient.

  In the figure, reference numeral 17 denotes an upper steel plate embedded in the rubber layer, and reference numeral 18 denotes a lower steel plate embedded in the rubber layer. The lower steel plate 18 has a female screw hole for attaching the mounting steel plate 6. It is provided as appropriate and is fixed to the lower structure 7 via the mounting steel plate 6 (see FIGS. 7 and 8).

If the rubber layer surface is a slip surface, the friction coefficient between rubber and concrete, or rubber and metal is large, and if the rubber layer surface is a flat slip surface, the intermediate rubber layer does not slide as in the conventional case. Since the main body portion is sheared and becomes unstable, in the present invention, grooves are formed as described above, and a large number of independent sliding surfaces 4 are formed to facilitate slipping.
The number of the grooves 14 and 15, the distance between the grooves 14 (15), and the depth of each groove are appropriately set according to the design.

The sliding surface provided on the one structure is a sliding surface made of any one of a concrete material, a steel material, a non-ferrous metal material, a synthetic resin material, a ceramic material, or a carbon compound material. Similarly, the friction coefficient with the rubber is large, and the above-described effect can be expected.
As the sliding surface of the concrete material, the bottom surface of the existing upper concrete structure itself or the upper surface of the lower concrete structure itself may be finished to form a sliding surface. May be provided.
A plate-like member made of a steel material such as carbon steel, alloy steel, or stainless steel can be used as the sliding surface made of the steel material.
Moreover, as a nonferrous metal material, the plate-shaped member by nonferrous metal materials, such as aluminum and aluminum alloy, titanium and titanium alloy, nickel, and a nickel alloy, can be used.
Further, the sliding surface of the synthetic resin material may be a sliding surface of a synthetic resin layer or a synthetic resin plate such as a tetrafluoroethylene resin or an epoxy resin.
Further, it may be a sliding surface of a plate-like member made of a ceramic material such as ceramic.
Moreover, the sliding surface by the plate-shaped member by carbon compound-made materials, such as carbon fiber, may be sufficient.
These sliding surfaces need to be hard sliding surfaces having a high pressure resistance and a small deformation when subjected to a pressing load.

  In the embodiment of FIG. 1, the groove 14 in the direction perpendicular to the sliding direction in the direction of the bridge axis A indicated by the arrow in the drawing is provided with the groove 15 in the direction perpendicular to the direction of the bridge. A sliding bearing that exhibits stable sliding behavior in the direction perpendicular to the axis can be obtained.

  1 and 6 is used to fix this to the lower structure 7 via the mounting steel plate 6 as a sole plate on the lower surface of the upper structure 8, A state in which a sliding support member 19 made of an aluminum plate having a flat bottom surface is fixed, and the bottom surface of the sliding support member 19 made of an aluminum plate is supported by the sliding surface 4 of the rubber grooved sliding support body 12 (see FIG. 7), a typical sliding form when a positive and negative horizontal force is applied is shown in FIG.

  As shown in the horizontal load and horizontal displacement diagram of FIG. 9, when the horizontal force is increased and a predetermined horizontal load (for example, 250 kN) is exceeded, the sliding behavior is smoothly exerted due to sliding friction, resulting in a bilinear hysteresis curve. It can be seen that the transition performance is exerted and the damping performance is exhibited, and the intermediate rubber layer 11 does not cause repeated shear deformation.

  Further, as shown in FIG. 8, in a state where the upper structure 8, which is a flat plain bottom surface 9 made of concrete, is supported by the sliding surface 4 of the rubber grooved sliding support 12 in the form shown in FIGS. 1 and 6. FIG. 10 shows a typical sliding form when a positive and negative horizontal force is applied.

  As shown in the horizontal load and horizontal displacement diagram of FIG. 10, when the horizontal force is increased and exceeds a predetermined horizontal load (for example, 200 kN), a slightly small V-shaped wave-like sliding behavior occurs and then the sliding friction is caused smoothly. It can be seen that the sliding behavior is exhibited, the transition to the bilinear hysteresis curve is exhibited, the damping performance is exhibited, and the repeated shear deformation by the intermediate rubber layer 11 does not occur.

  Various groove forms as shown in FIGS. 2 to 5 are possible in addition to the groove form shown in FIG. 1. In the embodiment of the rubber grooved sliding support 12 shown in FIG. In this configuration, the grooves 14 (15) are inclined 45 degrees in the bridge axis direction, and all the grooves 14 (15) are inclined and intersected with respect to the bridge axis direction. The groove-shaped support in such a form may be used as a support body for supporting a curved road or the like in which the upper structure 8 has a planar arc shape, or the upper structure 8 has a planar linear shape. You may use as a support body which supports the linear part of the form. The groove may be in a direction intersecting the slip direction, preferably in a direction intersecting at right angles to the slip direction. Since other configurations are the same as those of the above-described embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  The configuration of the rubber grooved sliding support 12 shown in FIGS. 3 to 5 is such that the direction of the numerous grooves 14 (15) is the same direction and intersects the sliding direction of the bridge axis direction A. In FIG. 3, it intersects perpendicularly to the sliding direction in the bridge axis direction A, and in FIG. 4, it intersects with the bridge axis direction in a state inclined at 45 degrees. And in the opposite direction. As shown in these figures, in the slip bearing device mainly composed of the slip in the bridge axis direction, the plane between the grooves in the slip direction is better to be installed so as to intersect the bridge axis direction than to be provided parallel to the bridge axis direction. The rectangular support 16 with the elongated sliding surface 4 is desirable because it can independently slide or elastically deform. The groove interval in the case of the plane elongated rectangular support 16 is appropriately set depending on the design.

  Since other configurations are the same as those of the above-described embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  FIG. 6 is an enlarged view of the groove portion of FIGS. 1 to 5 and shows one form of the interval between the grooves 14 (15), the groove width, and the groove depth. In FIG. In contrast, the groove center distance is 20 times and the groove depth is 3 times the groove width. In addition to this form, it is possible to appropriately provide in a state where no buckling deformation occurs between the grooves. 3 to 5, the other configurations are the same as those in the above embodiment, and therefore similar parts are denoted by the same reference numerals and description thereof is omitted.

  In the case of carrying out the present invention, the rubber grooved sliding support body 12 shown in FIGS. 2 to 5 is also attached with the mounting steel plate 6 in the same manner as in FIG. 1, and as shown in FIG. Or it is good also as a form which fixed the metal sliding support member 19 to either one side of the lower structure 7, and was set as the sliding support apparatus between the grooved rubber layer surface and the metal plate surface. As shown in FIG. 8, the sliding support member 19 in FIG. 7 is omitted, and a sliding bearing in which the grooved rubber layer surface and the concrete surface on the structure side are in contact is provided. May be.

  Further, as the above-described modification, the elastic bearing device 13 having the form shown in FIGS. 7 and 8 may be disposed in an inverted manner so that the sliding surface 4 is the upper surface. For example, a metal plate such as an aluminum alloy plate whose upper surface is a sliding support surface may be fixed to the lower structure side, or the concrete upper surface of the lower structure 7 side may be a sliding surface. When the structure 7 (8) is made of concrete, the sliding bearing body 3 is attached to the structure with an anchor bolt as appropriate, or when the structure 7 (8) is made of steel, Secure with bolts. When the lower steel plate 18 opposite to the sliding surface is embedded in the rubber layer as a steel plate having a female screw hole as shown in the figure, the lower structure 7 or the upper structure is interposed via the mounting steel plate 6. 8 can be easily attached.

  In addition, as shown in FIG. 8, when a concrete sliding surface is used, the sliding surface can be formed integrally with the upper structure 8 or the lower structure 7, so that an inexpensive sliding with improved slip damping performance is possible. It can be a bearing device. Further, when the metal sliding surface is used, a stable friction coefficient and damping performance can be ensured regardless of the deterioration of the structure even when the bearing is replaced in the repair work.

  The metal sliding support member 19 may be made of a metal such as a stainless steel plate having a flat sliding surface or other steel, instead of an aluminum plate or an aluminum alloy plate.

  In carrying out the present invention, the rubber grooved elastic bearing body 13 may be provided with columnar lead or high damping rubber, and the rubber grooved elastic bearing body 13 such as synthetic rubber or synthetic rubber containing synthetic resin. But you can.

  FIGS. 11 and 12 show rubber grooved sliding supports 12 according to the sixth and seventh embodiments of the present invention, respectively, which can be applied in the same manner as in the above-described embodiments. 1 and FIG. 2 except that the shape of each of the planar rectangular and short columnar support portions 16 shown in FIG. 1 and FIG. 2 is changed to a large number of planar circular and short columnar support portions 16. This is the same as in the case of FIG.

  More specifically, in the embodiment shown in FIG. 11, a large number of planar circular support portions 16 aligned in the left-right direction (bridge axis direction A) or the front-rear direction (bridge axis perpendicular direction) are arranged in the left-right direction. The continuous groove | channel 14 and the groove | channel 15 continuous in the front-back direction are formed, and the lattice-like continuous groove | channel is formed as a whole. The planar circular support portion 16 has an advantage that it has no directionality and is constant in all lateral directions. Since other configurations are the same as those in FIG. 1, the same reference numerals are given to the same elements, and the description thereof is omitted.

  Further, in the embodiment of the rubber grooved slide support 12 shown in FIG. 12, a large number of supports are provided in a planar staggered arrangement form in which a large number of support portions 16 of the form shown in FIG. 11 are inclined 45 degrees in the bridge axis direction. It is the form made into the groove | channel 14 (15) of the planar form inclined 45 degree | times between the parts 16 in the bridge-axis direction. Other configurations are the same as those in FIG.

When the present invention is implemented, the planar shape of the plurality of short columnar support portions 16 may be a circular shape, an elliptical shape, a rectangular shape, or a non-circular shape such as a polygonal shape. Further, in the present invention, the grooves 14 (15) spaced apart in the lateral direction are formed between a plurality of independent columnar portions 16 that form a rubber sliding surface that is erected integrally with the rubber coating layer base. Further, the planar arrangement form of the multiple columnar portions 16 may be arranged in the left-right direction (bridge axis direction) or in the front-rear direction, staggered arrangement, concentric arrangement, or the like. Therefore, the groove 14 (15) is not limited to a linear continuous groove, and any groove that allows deformation of the columnar portion 16 may be provided beside the columnar portion 16.
In the case of carrying out the present invention, when the direction of the groove 14 (15) is a direction that intersects the slip direction of the superstructure, for example, a direction that intersects the slip direction of the bridge axis direction A, A direction intersecting with a sliding direction other than the bridge axis direction A, such as a direction perpendicular to the bridge axis, may be used.
Needless to say, the sliding support device of the present invention can be used as a support installed in a new structure or as a support when repairing a new structure or an existing structure.

BRIEF DESCRIPTION OF THE DRAWINGS The rubber sliding bearing body of 1st Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is the vertical front view. The rubber-made sliding support body of 2nd Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is the vertical front view. The rubber sliding bearing body of 3rd Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is the longitudinal cross-sectional front view. The rubber sliding bearing body of 4th Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is the longitudinal cross-sectional front view. The rubber sliding bearing body of 5th Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is the longitudinal cross-sectional front view. It is a figure which expands and shows a part of groove part of a slip surface. It is a vertical front view which shows the state which interposed the rubber-made sliding support body of 1st Embodiment between the upper structure made into the sliding surface made from an aluminum alloy plate, and a lower structure. It is a vertical front view which shows the state which interposed the rubber | gum sliding support body of 1st Embodiment between the upper structure made into the concrete sliding surface, and a lower structure. It is a hysteresis curve explanatory drawing which shows the hysteresis characteristic at the time of setting it as the combination of the sliding elastic bearing apparatus of this invention, and an aluminum alloy plate. It is a hysteresis curve explanatory drawing which shows the hysteresis characteristic at the time of setting it as the combination of the sliding elastic bearing apparatus of this invention, and a concrete sliding surface. The rubber sliding bearing body of 6th Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is the longitudinal cross-sectional front view. The rubber sliding bearing body of 7th Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is the longitudinal cross-sectional front view. 1 shows a conventional sliding elastic bearing device in combination with a flat rubber sliding surface, wherein (a) is a plan view and (b) is a longitudinal front view thereof. It is the side view which looked at the conventional sliding elastic bearing apparatus combined with the flat rubber-made sliding surface from the bridge axis perpendicular direction. It is a hysteresis curve explanatory drawing which shows the hysteresis characteristic at the time of setting it as the combination of the conventional sliding elastic bearing apparatus and a concrete sliding surface.

DESCRIPTION OF SYMBOLS 1 Rubber layer 2 Hard board 3 Elastic bearing body 4 Sliding surface 5 Flat surface 6 Mounting steel plate 7 Lower structure 8 Upper structure 9 Flat concrete sliding lower surface 10 Elastic bearing device 11 Intermediate rubber layer 12 Rubber grooved sliding bearing body 13 Elastic bearing device 14 Groove (bridge axis direction)
15 Groove (Bridge axis perpendicular direction)
16 Supporting part (short column shape)
17 Upper steel plate 18 Lower steel plate 19 Sliding bearing member

Claims (7)

In the sliding support device in which the sliding surface on the other structure side that is interposed between the upper structure and the lower structure and is in contact with the sliding surface provided in one structure is a rubber sliding surface, the rubber sliding surface A plurality of rubber support portions each independently acting and partitioned by the grooves are formed, and the upper surface of each rubber support portion is a slip surface, The sliding support device according to claim 1, wherein each of the rubber support portions is deformable so as to swell laterally when subjected to a vertical load of the superstructure.   The sliding surface provided on the one structure is a sliding surface made of any one of a concrete material, a steel material, a non-ferrous metal material, a synthetic resin material, a ceramic material, or a carbon compound material. The sliding support device according to claim 1, wherein:   The sliding bearing device according to claim 2, wherein the sliding surface made of the non-ferrous metal material is an aluminum sliding surface.   The sliding bearing device according to any one of claims 1 to 3, wherein the groove is provided so as to intersect a sliding direction in a bridge axis direction or a direction perpendicular to the bridge axis.   The sliding support device according to any one of claims 1 to 4, wherein the groove is a lattice-like groove. 6. The sliding bearing device according to claim 1, wherein the groove is formed between a plurality of independent short columnar rubber support portions.   The sliding bearing device according to any one of claims 1 to 6, wherein the sliding bearing device is an elastic sliding bearing device including a laminated rubber bearing body.

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