JP2008128280A - Support - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support improved in bonding durability between a recess and an elastic body at an interface by suppressing tensile force generated to the interface of the recess and elastic body when shearing force is generated. <P>SOLUTION: A sliding rubber support 10 disposed on a bridge pier 12 to support a bridge girder 14 comprises a laminated body 16 with a rubber layer 26 and an inner steel plate 28 laminated between an upper connecting steel plate 22 and a lower connecting steel plate 24; a recess 30 provided at the upper face edge part of the upper connecting steel plate 22; outer skin rubber 18 filled in the recess 30 while covering the whole side face of the laminated body 16; and a reinforcing steel plate 20 provided on the upper connecting steel plate 22 and holding and compressing the outer skin rubber 18 between itself and the recess 30. Tensile force generated to the interface of the recess 30 and outer skin rubber 18 when shearing force is generated, is thereby suppressed to improve bonding durability between the recess 30 and outer skin rubber 18 at the interface. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bearing in which an elastic body and a hard plate harder than the elastic body are laminated, and more particularly to a bearing that is extremely excellent in durability during shear deformation.

  A structure in which a hard plate such as a steel plate and an elastic body such as rubber are laminated is widely used as a support that requires vibration proofing, vibration absorption, and the like. Since such a support is inserted between the building and the base and serves to support the entire building, it is difficult to replace it once it is installed, and even if it is technically replaceable. However, the cost is considerably high. For this reason, the bearing is required to have a durability life of 50 to 100 years, which is the same as that of a concrete structure.

  By the way, since the bearing is constantly exposed to the outside air during use, it is subject to long-term deterioration due to air, humidity, ozone, ultraviolet rays, radiation for nuclear power, sea breeze in the case of the seaside, and the like. Further, since the building is supported, it always receives a compressive load, and a considerable tensile stress is applied to the surface portion of the elastic layer (rubber layer) even in normal times. In addition, when a large earthquake occurs, the rubber layer is locally subjected to shear strain of 100 to 300%. Degradation further proceeds due to such stress strain. For this reason, in sliding bearings that require a long endurance life, the outer periphery is made of a weather-resistant rubber that has better weather resistance than the rubber layer in order to increase the weather resistance such as oxidation resistance, ozone resistance, and heat aging resistance. A technique for suppressing deterioration by coating is known.

Generally, steel plates (connected steel plates) are arranged at the uppermost and lowermost portions of the support. In patent document 1, in order to raise the adhesive force of an upper connection steel plate, a lower connection steel plate, and a weather resistant rubber, the good adhesive rubber excellent in adhesiveness is arrange | positioned among these.
JP 2005-188546 A

In a general sliding bearing, a highly slidable resin plate such as a fluororesin, for example, polytetrafluoroethylene (PTFE) is fixed to the surface of the upper connecting steel plate or the lower connecting steel plate.
However, as in the invention of Patent Document 1, a recess is provided on the upper surface edge of the upper connection steel plate or the lower surface edge of the lower connection steel plate, and the recess between the weather resistant rubber and the upper connection steel plate or the lower connection steel plate. When good adhesive rubber was filled in, a highly slidable resin plate was disposed inside the recess. This is due to the low adhesion between the highly slidable resin plate and the rubber. For this reason, when a shearing force is generated in the sliding bearing, a strong tensile force is generated at the interface between the concave portion and the good adhesive rubber, and there is a problem in that the bonding durability at the interface is lowered.

  In view of the above facts, the object of the present invention is to provide a support that suppresses the tensile force generated at the interface between the recess and the elastic body when the shear force is generated, thereby improving the durability of the bond between the recess and the elastic body at the interface. The purpose is to provide.

  In order to achieve the above object, a support according to claim 1 of the present invention is a laminated body in which an elastic body and a hard board harder than the elastic body are laminated between an upper connecting plate and a lower connecting plate. And a recess provided on at least one of the upper surface edge of the upper connection plate and the lower surface edge of the lower connection plate, wherein the elastic body is covered over the entire side surface of the laminate. And a reinforcing plate is disposed on the side where the concave portion is provided, and the elastic body is sandwiched between the concave portion and the reinforcing plate for compression.

Next, the effect | action of the support of Claim 1 is demonstrated.
Even if a shearing force is generated in the support of claim 1, since the elastic body filled in the concave portion is sandwiched and compressed between the concave portion and the reinforcing plate, the tensile force acting on the interface between the concave portion and the elastic body is suppressed. The For this reason, the durability of adhesion between the concave portion and the elastic body at the interface is improved, and the durability of the bearing is improved.
Therefore, the tensile force generated at the interface between the recess and the elastic body when the shear force is generated is suppressed, and the durability of bonding between the recess and the elastic body at the interface is improved.

  The bearing according to claim 2 of the present invention is characterized in that, in the bearing according to claim 1, the width of the recess satisfies 5 to 50 mm.

Next, the effect | action of the support of Claim 2 is demonstrated.
If the width of the recess is less than 5 mm, the width of the elastic body sandwiched between the recess and the reinforcing plate is short, and when a shearing force is generated in the support, the effect of suppressing the tensile force is low, and if this width exceeds 50 mm When a shearing force is generated in the support, the elastic body sandwiched between the recess and the reinforcing plate may be broken halfway. Therefore, it is preferable that the width of the recess satisfies 5 to 50 mm.

  The bearing according to claim 3 of the present invention is characterized in that, in the bearing according to claim 1 or 2, the thickness of the concave portion satisfies 1 to 10 mm.

Next, the effect | action of the support of Claim 3 is demonstrated.
If the thickness of the recess is less than 1 mm, there is a possibility that the elastic body sandwiched between the recess and the reinforcing plate may break in the middle when shear force is generated in the support. If the thickness exceeds 10 mm, the recess and the reinforcing plate Since the thickness of the elastic body sandwiched between and is too thick, when a shear force is generated in the bearing, the effect of suppressing the tensile force is reduced. Moreover, if the thickness of the recess is too thick, the reinforcing plate may be bent excessively. Therefore, it is preferable that the thickness of the recess satisfies 1 to 10 mm.

  In the support of the present invention, the tensile force generated at the interface between the recess and the elastic body when the shearing force is generated is suppressed, and the durability of bonding between the recess and the elastic body at the interface is improved.

[First Embodiment]
(Structure) FIGS. 1A and 1B show a sliding rubber bearing 10 used for a bridge or the like to which the bearing of the present invention is applied. In this embodiment, the sliding rubber support 10 is provided on the bridge pier 12 to support the bridge girder 14. 1A is a partial cross-sectional view of the sliding rubber bearing 10 according to the first embodiment of the present invention as viewed from the direction perpendicular to the bridge axis, and FIG. 1B is a cross-sectional view of FIG. FIG. The bridge axis direction (longitudinal direction of the bridge) in this drawing is indicated by an arrow X.

  As shown in FIG. 1, a base plate 40 is disposed on the upper surface of the pier 12. The base plate 40 is fixed to the pier 12 by a first anchor member 44 (for example, an anchor bolt).

  A sliding rubber support 10 is disposed on the base plate 40. The sliding rubber support 10 includes a lower rod 34, a laminated body 16, a reinforcing steel plate 20, a high slidable resin plate 32, and a receiving plate 38.

  The lower rod 34 is screwed into a first female screw (not shown) formed on the base plate 40 by inserting a first mounting bolt (not shown) through a first through hole (not shown) formed in the lower rod 34. By fixing, the base plate 40 is fixed. It should be noted that the fixing means for the lower rod 34 and the base plate 40 may be other than this fixing means.

On the lower rod 34, the laminate 16 is disposed. The laminate 16 includes an upper connecting steel plate 22, a lower connecting steel plate 24, and rubber layers 26 and internal steel plates 28 that are alternately stacked in the thickness direction therebetween. A concave portion 30 (notched portion) that is recessed from the upper surface of the upper connecting steel plate 22 is formed on the upper surface edge of the upper connecting steel plate 22. Moreover, the upper surface inner edge and the upper surface outer edge of the upper connecting steel plate 22 are chamfered obliquely. The entire side surface of the laminate 16 is covered with an outer rubber 18 made of rubber having better weather resistance than the rubber layer 26. The outer rubber 18 is also filled in the recess 30.
The width W of the recess 30 preferably satisfies 5 to 50 mm, and the thickness T preferably satisfies 1 to 10 mm.

  A reinforcing steel plate 20 is fixed in close contact with the upper surface of the upper connecting steel plate 22. The reinforcing steel plate 20 is compressed by sandwiching the outer rubber 18 with the recess 30. Note that a part of the upper connecting steel plate 22, the lower connecting steel plate 24, the inner steel plate 28 and the reinforcing steel plate 20 (contact surface with the outer rubber 18) is vulcanized and bonded to the rubber layer 26 and the outer rubber 18. It is preferable. Here, it is preferable to use natural rubber, chloroprene rubber, butadiene rubber, isoprene rubber, styrene butadiene rubber or the like as the material of the rubber layer 26, and as the material of the outer rubber 18, butyl rubber, ethylene propylene rubber, chloroprene or polyurethane. It is preferable to use ethylene vinyl acetate rubber, urethane rubber, fluorine rubber, or silicone rubber.

  In the present embodiment, the internal steel plate 28 has a rectangular plate shape, and the upper connecting steel plate 22 and the lower connecting steel plate 24 have a rectangular plate shape in accordance with this. Thereby, although the laminated body 16 has become a flat substantially quadrangular prism shape as a whole, the shape of the laminated body 16 is not limited thereto, and may be, for example, a cylindrical shape or a polygonal column shape other than a rectangular column ( For example, it may be a hexagonal column).

  The lower connecting steel plate 24 is inserted into a through hole formed in the lower rod 34 with a second mounting bolt (not shown) and screwed into a second female screw (not shown) formed in the lower connecting steel plate 24. This is fixed to the lower rod 34. It should be noted that the fixing means between the lower rod 34 and the lower connecting steel plate 24 may be other than this fixing means.

  Further, as shown in FIG. 1 (A), a fixing concave portion 24A and a fixing concave portion 34A are formed on opposing surfaces (center) of the lower connecting steel plate 24 and the lower rod 34, respectively. A fixing key 46 is fitted into the fixing recess 24A and the fixing recess 34A without any gap. Thereby, the shift | offset | difference to the horizontal direction (direction along a contact surface) with the laminated body 16 and the lower collar 34 is blocked | prevented.

  A highly slidable resin plate 32 such as a fluororesin, for example, polytetrafluoroethylene (PTFE) is fixed to the upper surface of the reinforcing steel plate 20. A sliding plate 38 having a low coefficient of friction with the highly slidable resin plate 32 is disposed in close contact with the upper surface of the highly slidable resin plate 32. As the sliding plate 38, for example, a stainless steel plate is preferably used. An upper support plate 36 is disposed on the sliding plate 38, and the bridge girder 14 is disposed on the upper support plate 36.

  The upper support plate 36 is fixed to the bridge beam 14 by a second anchor member 42 (for example, an anchor bolt). Further, the sliding plate 38 is inserted into a third through-hole (not shown) formed in the sliding plate 38 through a third mounting bolt (not shown) to form a third female screw (not shown) formed in the upper support plate 36. ) And is fixed to the upper support plate 36. The fixing means for the sliding plate 38 and the upper support plate 36 may be other than this fixing means.

In the present embodiment, the upper inner edge and the upper outer edge of the upper connecting steel plate 22 are chamfered obliquely, but it is not necessary to be limited to this configuration. The upper surface outer edges may be formed so as to be at right angles, or may be formed in other shapes.
In the present embodiment, the outer rubber 18 is made of rubber having better weather resistance than the rubber layer 26. However, it is not necessary to be limited to this structure, and the rubber layer 26 and the outer rubber 18 are the same type of rubber. The structure which consists of rubber | gum other than these may be sufficient.

(Operation) Next, the operation of the sliding rubber bearing 10 of the first embodiment will be described.
For example, when the bridge pier 12 and the bridge girder 14 are moved relative to each other in the horizontal direction due to an earthquake or the like, a shearing force is generated in the sliding rubber support 10. The tensile force acting on the interface between the outer rubber 30 and the outer rubber 18 is suppressed. For this reason, the adhesion durability at the interface between the recess 30 and the outer rubber 18 is improved, and the durability of the sliding rubber bearing 10 is improved.
Therefore, the tensile force generated at the interface between the concave portion 30 and the outer rubber 18 when the shearing force is generated is suppressed, and the adhesion durability between the concave portion 30 and the outer rubber 18 at the interface is improved.

  If the width W of the recess 30 is less than 5 mm, the outer rubber 18 sandwiched between the recess 30 and the reinforcing steel plate 20 has a short width, and when shearing force is generated in the sliding rubber bearing 10, the effect of suppressing the tensile force is obtained. If the width W exceeds 50 mm, when the shearing force is generated in the sliding rubber support 10, the outer rubber 18 sandwiched between the recess 30 and the reinforcing steel plate 20 may be broken halfway. Therefore, it is preferable that the width W of the recess 30 satisfies 5 to 50 mm.

  If the thickness T of the concave portion 30 is less than 1 mm, the outer rubber 18 sandwiched between the concave portion 30 and the reinforcing steel plate 20 may be broken halfway when a shearing force is generated in the sliding rubber support 10. If the thickness exceeds 10 mm, the thickness of the outer rubber 18 sandwiched between the recess 30 and the reinforcing steel plate 20 is too thick, so that when the shearing force is generated in the sliding rubber bearing 10, the effect of suppressing the tensile force is reduced. Moreover, when the thickness T of the recessed part 30 is too thick, there exists a possibility that the bending of the reinforcing steel plate 20 may become excessive. Therefore, it is preferable that the thickness T of the recess 30 satisfies 1 to 10 mm.

[Other Embodiments]
In the first embodiment, the high slidable resin plate 32 and the sliding plate 38 are provided on the upper part of the sliding rubber support 10 so as to be slidable in the horizontal direction. However, it is necessary to be limited to this configuration. The sliding rubber support 10 is turned upside down, the lower rod 34 is fixed to the upper support plate 36, the sliding plate 38 is fixed to the base plate 40, and the lower portion of the sliding rubber support 10 is slidable in the horizontal direction. It may be. That is, the sliding rubber bearing 10 may be configured such that the lower part is fixed and the upper part is slidable, or the upper part is fixed and the lower part is capable of impulse.

(A) It is the partial sectional view which looked at the support concerning a 1st embodiment of the present invention from the direction perpendicular to a bridge axis. (B) is the B section enlarged view of FIG. 1 (A).

Explanation of symbols

10 Sliding rubber bearing (support)
16 Laminated body 18 Outer rubber (elastic body)
20 Reinforced steel plate (Reinforcement plate)
22 Upper connecting steel plate (Upper connecting plate)
24 Lower connection steel plate (lower connection plate)
26 Rubber layer (elastic body)
28 Internal steel plate (hard plate)
30 Recess W W Recess width T Recess thickness

Claims (3)

A laminate in which an elastic body and a hard plate harder than the elastic body are laminated between the upper connecting plate and the lower connecting plate;
A recess provided on at least one of an upper surface edge of the upper connection plate and a lower surface edge of the lower connection plate,
The elastic body is covered on the entire side surface of the laminated body and filled in the recess,
A support, wherein a reinforcing plate is disposed on the side where the concave portion is provided, and the elastic body is sandwiched between the concave portion and the reinforcing plate for compression.   The bearing according to claim 1, wherein a width of the recess satisfies 5 to 50 mm. The thickness of the said recessed part satisfy | fills 1-10 mm, The support of Claim 1 or Claim 2 characterized by the above-mentioned.

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