JP6217088B2 - Sliding bearing device - Google Patents

Description

  The present invention relates to a sliding bearing device, and more particularly, to a sliding bearing device capable of maintaining smooth sliding movement on a sliding surface over a long period of time.

  2. Description of the Related Art A sliding support device is known that is disposed between an upper structure such as a bridge girder and a lower structure such as a bridge pier and absorbs expansion and contraction and shaking of the upper structure. The sliding bearing device has a sliding surface, and has a structure that slides on the sliding surface when the upper structure expands or contracts due to the influence of outside air temperature or when it is shaken by an earthquake. When foreign matters such as dust, stones, and concrete pieces are present on the sliding surface, smooth sliding movement cannot be secured, and the above-described expansion and contraction and shaking cannot be sufficiently absorbed.

  Conventionally, it has been proposed to provide a cover to prevent moisture and dust from adhering to the sliding surface (see, for example, Patent Documents 1 and 2). The cover proposed in Patent Documents 1 and 2 is placed on the sliding surface and moves together with the upper structure. During this movement, the cover is structured to wipe off moisture and dirt on the sliding surface. Since this cover abuts against the sliding surface and wears over time, wear debris may remain on the sliding surface and become a foreign object. To ensure smooth sliding movement on the sliding surface over a long period of time It is disadvantageous. Further, in order to ensure smooth sliding movement on the sliding surface, this cover is required to have excellent sliding properties so as not to obstruct the sliding movement of the support body.

JP 2002-285733 A JP 2011-231459 A

  An object of the present invention is to provide a sliding bearing device capable of maintaining a smooth sliding movement on a sliding surface over a long period of time.

In order to achieve the above object, the sliding support device of the present invention includes a sliding plate fixed to the lower surface of the sole plate fixed to the lower surface of the upper structure, and an upper surface of the base plate fixed to the upper surface of the lower structure. It has a support body fixed between the base plate and the sliding plate, and the sliding plate is slidably mounted on the upper surface of the upper collar, which is the upper end member of the support body. In the sliding support device, the sliding plate has an annular peripheral wall protruding downward at a peripheral portion, and a flexible cover member is provided for closing between the outer peripheral surface of the support body and the inner peripheral surface of the peripheral wall , The flexible space is provided with a gap between the bottom surface of the sliding plate inside the peripheral wall and the top surface of the flexible cover member. In contrast to the case where no cover member is provided, by providing the flexible cover member, the increase rate of the force necessary for sliding the sliding plate is reduced to 10% or less, and the upper structure exerts a horizontal force. Accordingly, the horizontal force is attenuated by sliding friction when the sliding plate slides .

  According to the present invention, the sliding plate placed so as to be slidable with respect to the upper surface of the upper collar has an annular peripheral wall protruding downward at the peripheral edge, and the outer peripheral surface of the support body and the peripheral wall Since the flexible cover member which closes between the inner peripheral surfaces is provided, the bottom surface of the sliding plate and the upper surface of the upper collar serving as the sliding surfaces are blocked from the outside by the flexible cover member. Therefore, foreign matter such as dust, stones, and concrete pieces can be prevented from entering the sliding surface from the outside. In addition, the flexible cover member does not substantially wear due to contact with the sliding surface, and even if it is worn, the wear residue falls downward and does not remain on the sliding surface. Therefore, it is possible to maintain smooth sliding on the sliding surface over a long period of time.

Here, the specification in which a gap comprising a cavity between the upper surface of the bottom and the flexible cover member of said sliding plate. According to this specification, since the flexible cover member and the sliding surface are completely in non-contact, it becomes more and more advantageous to maintain a smooth slip over a long period of time.

  As the flexible cover member, for example, a member obtained by foaming a flexible material or a member formed of a film material in a bellows shape can be used.

  The peripheral wall may be configured to extend between the center in the thickness direction of the support body and the upper surface of the lower collar that is the lower end member of the support body. According to this specification, when a lifting force acts on the upper structure, the peripheral wall can function as a detachment preventing member that prevents the sliding plate from being detached from the support body.

It is sectional drawing which illustrates the installation state of the sliding bearing apparatus of this invention. It is a top view which illustrates the sliding support apparatus of FIG. It is AA sectional drawing of FIG. It is explanatory drawing which illustrates the state of the sliding bearing apparatus at the time of the upper structure of FIG. 3 slidingly moved by sectional view. It is sectional drawing which illustrates another embodiment of a sliding bearing apparatus.

  Hereinafter, the sliding bearing device of the present invention will be described based on the embodiments shown in the drawings. In the drawings, the bridge axis direction is indicated by the X direction, and the direction perpendicular to the bridge axis is indicated by the Y direction.

  The sliding support device 1 of the embodiment of the present invention illustrated in FIGS. 1 to 3 is installed in a lower structure 12 such as a bridge pier that supports an upper structure 11 such as a bridge girder. A base plate 10 is fixed to the upper surface of the lower structure 12 by an anchor 13 and a fixing nut 14. A sole plate 9 is fixed to the lower surface of the upper structure 11 with bolts or the like.

  The sliding support device 1 includes a sliding plate 7, a support body 2, and a flexible cover member 8. The sliding plate 7 is fixed to the lower surface of the sole plate 9 with bolts or the like. The support body 2 is installed on the upper surface of the base plate 10.

  The support body 2 of this embodiment includes a rubber laminate 2a in which rubber layers 3 and steel plates 4 are alternately laminated, an upper plate 5 of a metal plate fixed to the upper surface of the rubber laminate 2a, and a rubber laminate. It is comprised with the lower collar 6 of the metal plate fixed to the lower surface of 2a. The steel plate 4, the upper collar 5 and the lower collar 6 are vulcanized and integrated with the adjacent rubber layer 3. The lower collar 6 is fixed to the base plate 10 with bolts or the like.

  The upper surface of the upper collar 5 is formed of a sliding material 5a. As the sliding material 5a, for example, a metal such as stainless steel (SUS316 or the like) or general carbon steel is used. A sliding plate 7 is slidably mounted on the sliding material 5a.

  The sliding plate 7 has an annular peripheral wall 7a protruding downward at the peripheral edge of a metal disk. An inner bottom surface surrounded by the peripheral wall 7a is formed of a sliding material 7b. Examples of the sliding material 7b include a low friction resin such as polytetrafluoroethylene (PTFE) resin, a molybdenum disulfide baking material, and the like. That is, the sliding material 5a that is the upper surface of the upper collar 5 is in contact with the sliding material 7b that is the bottom surface of the sliding plate 7, so that the sliding plate 7 can smoothly slide and move relative to the sliding material 5a. In addition, a low friction resin such as polytetrafluoroethylene (PTFE) resin or a molybdenum disulfide baking material is adopted for one sliding material 5a, and a metal such as stainless steel (SUS316 or the like) or general carbon steel is used for the other sliding material 7b. Can also be adopted.

  In this embodiment, the rubber laminate 2a, the upper rod 5 and the lower rod 6 are cylindrical, but for example, a polygonal column shape such as a quadrangular column shape may be adopted. Further, the sliding plate 7 is not limited to a circular shape, and a polygonal shape such as a quadrangle can also be adopted. The peripheral wall 7a is not limited to an annular shape but may be a polygonal shape such as a square shape. The shape of the peripheral wall 7a is preferably matched to the shape of the rubber laminate 2a and the upper collar 5. If the rubber laminate 2a and the upper collar 5 are cylindrical, the peripheral wall 7a may be annular, and the rubber laminate 2a and upper If the gutter 5 is a quadrangular prism, the peripheral wall 7a may be a quadrangular ring.

  A space for ensuring sliding movement of the sliding plate 7 is provided between the outer peripheral surface of the support body 2 and the inner peripheral surface of the peripheral wall 7a of the sliding plate 7. In the present invention, the outer periphery of the support body 2 is provided. A flexible cover member 8 is provided to close the space between the surface (at least one outer peripheral surface of the upper collar 5 and the rubber laminate 2a) and the inner peripheral surface of the peripheral wall 7a of the sliding plate 7. That is, by the flexible cover member 8, between the outer peripheral surface of the upper flange 5 and the inner peripheral surface of the peripheral wall 7a, between the outer peripheral surface of the rubber laminate 2a and the inner peripheral surface of the peripheral wall 7a, or the upper flange 5 And the space between the outer peripheral surface of the rubber laminate 2a and the inner peripheral surface of the peripheral wall 7a is closed.

  In this embodiment, as the flexible cover member 8, a member obtained by foaming a flexible material, such as a polyurethane resin foam resin, a foamed plastic foam material, or a rubber foam material is used. Furthermore, in this embodiment, a gap S is provided between the bottom surface (sliding material 7 b) of the sliding plate 7 and the upper surface of the flexible cover member 8.

  As illustrated in FIG. 4, when the upper structure 11 expands due to an increase in the outside air temperature or contracts due to a decrease in the outside air temperature, the sole plate 9 and the sliding plate 7 move in synchronization with the upper structure 11. To do. That is, the sliding plate 7 slides on the sliding material 5a of the upper collar 5. With this sliding movement, the flexible cover member 8 existing on the sliding movement direction side is pulled, and the flexible covering member 8 existing on the opposite side of the sliding movement direction is compressed.

  Thus, in this sliding bearing device 1, when the upper structure 11 receives a horizontal force in the bridge axis direction X, the sliding plate 7 slides in the bridge axis direction X on the upper surface (sliding material 5 a) of the upper rod 5. The horizontal force in the bridge axis direction X is attenuated by the sliding friction between the sliding members 5a and 7b at that time. When the superstructure 11 receives a horizontal force in the direction Y perpendicular to the bridge axis, the sliding plate 7 slides on the upper surface (sliding material 5a) of the upper rod 5 in the direction Y perpendicular to the bridge axis, and the sliding materials 5a, 7b at that time The horizontal force in the direction perpendicular to the bridge axis Y is attenuated by the sliding friction between the two.

  When the sliding movement amount of the sliding plate 7 becomes excessive and the peripheral wall 7a comes into contact with the side surface of the upper collar 5, the rubber laminate 2a undergoes shear deformation. Therefore, even if an excessive horizontal force is applied, the rubber laminate 2a stably supports the load of the upper structure 11 without being damaged.

  Since the flexible cover member 8 is easily deformed, a large force is not necessary for the deformation. For example, when the flexible cover member 8 is not provided, the increase rate of the force required to slide the sliding plate 7 by providing the flexible cover member 8 is 10% or less, more preferably 5%. % Or less. Therefore, the smooth sliding movement of the sliding plate 7 is not hindered.

  Then, the bottom surface (sliding material 7 b) of the sliding plate 7 serving as a sliding surface and the upper surface (sliding material 5 a) of the upper collar 5 are blocked from the outside by the flexible cover member 8. Therefore, foreign matter such as dust, stones, and concrete pieces can be prevented from entering the sliding surface from the outside. Further, the flexible cover member 8 does not substantially wear due to contact with the sliding surface, and even if the flexible covering member 8 is worn, the wear residue falls down and does not remain on the sliding surface. Therefore, smooth sliding on the sliding surface can be maintained for a long time.

Flexible cover member 8 can also be filled so as to block all the space between the inner circumferential surface of the outer peripheral surface of the upper shoe 5 and rubber laminate 2a and the peripheral wall 7a, in the present invention, as in this embodiment In addition, the clearance is provided between the bottom surface (sliding material 7b) of the sliding plate 7 and the top surface of the flexible cover member 8, so that the flexible cover member 8 and the sliding surface are completely in contact with each other. to. Therefore, it becomes more and more advantageous to maintain a smooth sliding of the sliding plate 7 over a long period of time.

  In consideration of the possibility that the sliding plate 7 is separated from the rubber laminate 2a when the lifting force is applied to the upper structure 11, it is preferable that the peripheral wall 7a extends long downward. Therefore, for example, the peripheral wall 7 a is set to extend between the center of the support body 2 in the thickness direction and the upper surface of the lower collar 6. With this specification, the peripheral wall 7a can effectively function as a detachment preventing member that prevents the sliding plate 7 from detaching from the rubber laminate 2a.

  As illustrated in FIG. 5, as the flexible cover member 8, a member in which the film material 8 b is formed in a bellows shape can be used. In this embodiment, the flexible cover member 8 includes a plurality of annular core members 8 arranged concentrically, and the core member 8a is integrated with a film member 8b formed of rubber or resin. A flexible cover member 8 is configured. The film material 8b has a slack between the adjacent core materials 8a and is formed in a bellows shape.

  In addition, this invention is not restricted to the support body 2 provided with the rubber laminated body 2a between the upper collar 5 which is an upper end member, and the lower collar 6 which is a lower end member, Other bearing bodies 2 can also be used. For example, a steel support such as a support plate support can be used.

DESCRIPTION OF SYMBOLS 1 Sliding bearing apparatus 2 Bearing body 2a Rubber laminated body 3 Rubber layer 4 Steel plate 5 Upper rod 5a Sliding material 6 Lower collar 7 Sliding plate 7a Peripheral wall 7b Sliding material 8 Flexible cover member 8a Core material 8b Film material 9 Sole plate 10 Base plate 11 Upper structure 12 Lower structure 13 Anchor 14 Fixing member

Claims (5)

A sliding plate fixed to the lower surface of the sole plate fixed to the lower surface of the upper structure, and an upper surface of the base plate fixed to the upper surface of the lower structure, between the base plate and the sliding plate A sliding bearing device, wherein the sliding plate is mounted so as to be slidable relative to an upper surface of an upper collar which is an upper end member of the bearing body.
The sliding plate has an annular peripheral wall protruding downward at a peripheral edge portion, and a flexible cover member is provided to close a space between the outer peripheral surface of the support body and the inner peripheral surface of the peripheral wall, and is located inside the peripheral wall. In the case where a gap is provided between the bottom surface of the sliding plate and the upper surface of the flexible cover member and the flexible cover member is not provided, the flexible cover member is When the sliding plate is moved, the rate of increase in force required to slide the sliding plate is set to 10% or less, and the horizontal force is applied by the sliding friction when the sliding plate slides when the upper structure receives a horizontal force. A sliding bearing device characterized in that the structure is damped . The sliding support device according to claim 1 , wherein the flexible cover member is a member obtained by foaming a flexible material. The sliding support device according to claim 1 , wherein the flexible cover member is a member in which a film material is formed in a bellows shape. The flexible cover member integrates a plurality of annular core members arranged concentrically with the film material formed of rubber or resin, and the film material is placed between the adjacent core materials. 4. The sliding bearing device according to claim 3, wherein the sliding bearing device is formed in a state having a slack.   The sliding bearing device according to any one of claims 1 to 4, wherein the peripheral wall extends between a center in a thickness direction of the bearing body and an upper surface of a lower collar that is a lower end member of the bearing body.

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