JP2008248593A - Rubber sliding bearing body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber sliding bearing body which blocks the transmission of a horizontal force to a lower structure by sliding an upper shoe by means of a sliding member, even if the horizontal force acting on an upper structure is small, which also exerts stable performance when subjected to vertical vibrations, and which simplifies and facilitates installation work. <P>SOLUTION: An upper flange portion 5 having a sliding member 4 fixed to a surface thereof, is connected to an upper surface of a rubber laminate 6 in one body, and a lower surface of the rubber laminate 6 is fixed to an upper surface of a lower shoe 8, to thereby integrate the rubber laminate 6, the upper flange portion 5, and the lower shoe 8 together so as not to be vertically separated from each other. Notched portions 5a formed at the both ends, in a direction perpendicular to a bridge axis, of the upper flange portion 5, and side blocks 9 erected from the lower shoe 8, are fitted together, and therefore, the horizontal movement of the upper flange portion 5 is regulated and set in an immovable state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sliding rubber bearing, and more particularly, even when the horizontal force acting on the upper structure is very small, the horizontal force is transmitted to the lower structure by sliding the upper rod with the sliding member. The present invention relates to a sliding rubber bearing body that can exhibit stable performance even when it is cut off and is subject to vertical vibrations, and can be easily installed.

  The sliding rubber bearing is provided with a sliding member between the lower surface of the upper collar fixed to the upper structure and the upper surface of the rubber laminate, and when the upper structure receives a horizontal force, The horizontal force is damped by sliding with. However, in the case of a minute horizontal force, the horizontal force is smaller than the frictional force between the sliding member and the member that contacts the sliding member, so the upper eyelid does not slide. As a result, shear deformation occurs in the rubber laminate, causing a problem that the horizontal displacement of the upper structure is transmitted to the lower structure via the rubber laminate. Moreover, the problem that the effect which attenuate | damps the horizontal force by the sliding of an upper arm cannot be produced also arises.

  Therefore, an intermediate plate independent of the rubber laminate is placed on the upper surface of the rubber laminate, and a sliding member is fixed on the surface of the intermediate plate to slide the upper rod and restrain the horizontal movement of the intermediate plate. A sliding rubber bearing body provided with restraining means has been proposed (see, for example, Patent Document 1).

However, in this proposal, it is necessary to prepare an intermediate plate separately from the rubber laminate, and there is a problem that positioning when placing the intermediate plate at a predetermined position on the upper surface of the rubber laminate is troublesome. Furthermore, since the intermediate plate is only mounted on the upper surface of the rubber laminate and is not fixed, when vertical vibrations occur, not only the lower surface of the upper collar and the intermediate plate are deviated vertically, The intermediate plate and the upper surface of the rubber laminate may be separated vertically. For this reason, when subjected to vertical vibration, there has been a problem that stable performance as a sliding rubber bearing cannot be exhibited.
Japanese Patent No. 2849701

  Even if the horizontal force acting on the upper structure is very small, the object of the present invention is to prevent the horizontal force from being transmitted to the lower structure by sliding the upper rod with the sliding member and receiving vertical vibration. It is another object of the present invention to provide a sliding rubber bearing body that can exhibit stable performance and can be easily installed.

  In order to achieve the above object, the sliding rubber bearing of the present invention has a rubber layer and a steel plate alternately between an upper hook fixed to the lower surface of the upper structure and a lower hook fixed to the upper surface of the lower structure. In a sliding rubber bearing provided with a laminated rubber laminate, a sliding member provided between the lower surface of the upper collar and the upper surface of the rubber laminated body, and a regulating means for regulating horizontal movement of the sliding member, The rubber laminate is configured by integrally joining an upper flange portion having the sliding member fixed to the surface on the upper surface, and a notch portion provided at both ends of the upper flange portion in a direction perpendicular to the bridge axis; The restricting means is constituted by a side block that is erected on a lower arm and fitted into the notch.

  Here, the lower surface of the rubber laminate and the upper surface of the lower collar can be fixed. Further, the upper surface periphery of the sliding member can be chamfered. Further, a gap sliding member fixed to the notch or the side block may be interposed in the gap between the fitting surfaces of the notch and the side block.

  According to the sliding rubber bearing body of the present invention, the rubber laminate disposed between the upper and lower collars is configured by integrally joining the upper flange portion, which has the sliding member fixed to the upper surface, on the upper surface thereof. When the rubber laminate and the upper flange portion are integrated and subjected to vertical vibration, they do not deviate vertically. Therefore, even when subjected to vertical vibration, stable performance as a sliding rubber bearing can be exhibited. Further, it is not necessary to prepare an intermediate plate separately as in the prior art, and the troublesome positioning work of the intermediate plate is not required.

  In addition, the notch part provided on both ends of the upper flange in the direction perpendicular to the bridge axis and the side block that stands on the lower arm and fits into the notch part constitutes a restricting means that restricts the horizontal movement of the upper flange part. Therefore, even if the horizontal force acting on the upper structure is very small, the upper member is slid by the sliding member against the frictional force between the sliding member and the member contacting the sliding member. Transmission of horizontal force to the structure can be cut off.

  Hereinafter, the sliding rubber bearing of the present invention will be described based on the embodiments shown in the drawings.

  As illustrated in FIGS. 1 to 3, the sliding rubber bearing 1 of the present invention is fixed to the upper surface 2 fixed to the lower surface of the upper structure 13 such as a bridge and the upper surface of the lower structure 14 such as a bridge pier. A rubber laminate 6 in which rubber layers 6a and steel plates 6b are alternately laminated is disposed between the lower brace 8. The upper structure 13 and the upper collar 2 are fixed via a shear key 11a and a key groove 12a. A key groove 12b is formed in the lower steel plate 7 and the lower rod 8 which are exposed and embedded in the lower surface of the rubber laminate 6, and the lower surface of the rubber laminate 6 is formed by the key groove 12b and the shear key 11b. The upper surface of the lower eyelid 8 is fixed. Fastening means such as bolts may be used in place of the shear keys 11a and 11b and the key grooves 12a and 12b.

  The upper flange portion 5 is integrally joined to the upper surface of the rubber laminate 6. The upper flange portion 5 has a peripheral dimension protruding beyond the rubber laminate 6 by making the plane dimension larger than that of the rubber laminate 6, and the rubber laminate 6 is a so-called single flange type. . On the surface of the upper flange portion 5, the sliding member 4 is fixed with a predetermined thickness protruding from the surface of the flange portion 5. The protruding upper surface of the sliding member 4 is chamfered over the entire periphery. Examples of the sliding member 4 include PTFE (polytetrafluoroethylene) and molybdenum disulfide baking material.

  In addition, it can also be set as the form (what is called both flange type) which integrated the lower surface of the rubber laminated body 6 and the upper surface of the lower collar 8 by vulcanization adhesion. In such a double flange type rubber laminate 6, the lower steel plate 7, the shear key 11 b, and the key groove 12 b are not required. Therefore, it becomes easy to reduce the height of the sliding rubber support 1, and it can be installed even when the space between the upper structure 13 and the lower structure 14 is small and restricted, In addition, the cost is reduced by reducing the number of components.

  A stainless steel plate 3 is joined to the lower surface of the upper collar 2. Instead of the stainless steel plate 3, for example, a molybdenum disulfide baking material or the like can be used. The stainless steel plate 3 is brought into contact with the upper surface of the sliding member 4 so that the upper rod 2 is placed, and the upper rod 2 slides on the upper surface of the sliding member 4.

  At both ends of the upper flange portion 5 in the direction perpendicular to the bridge axis, rectangular cutout portions 5a are provided. Side blocks 9 fixed to the lower rod 8 by fixing bolts 10 are erected on both sides of the rubber laminate 6 in the direction perpendicular to the bridge axis. The fitting part 9a of the side block 9 is fitted into the notch part 5a of the upper flange part 5, whereby the movement of the upper flange part 5 in the horizontal direction is restricted. 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. Further, the upper end engaging portion 9b of the side block 9 is configured so as to cover the engaging flange portion 2a of the upper rod 2 and engage with each other, and the upper rod 2 and the lower rod 8 are relatively moved up and down. I try to regulate it.

  Since the upper flange portion 5 is brought into an immovable state by fitting the notch portion 5a and the fitting portion 9a, even if the horizontal force acting on the upper structure 13 is very small, the sliding member 4 and the stainless steel plate The upper collar 2 can slide on the upper surface of the sliding member 4 against the frictional force between the upper and lower sides. As a result, shear deformation does not occur in the rubber laminate 6, and transmission of horizontal force to the lower structure 14 can be blocked via the rubber laminate 6. Further, the horizontal force can be attenuated by the upper rod 2 sliding on the upper surface of the sliding member 4.

  In the present invention, since the rubber laminate 6, the upper flange portion 5 (sliding member 4), and the lower rod 8 are integrated, when the upper structure 13 and the lower structure 14 are subject to vertical vibration, These three members do not deviate vertically. That is, there is a possibility that the upper and lower parts are separated from each other only between the upper flange 2 (stainless steel plate 3) and the upper flange part 5 (sliding member 4), which is more stable in the vertical direction than the conventional sliding rubber bearing. The property is significantly improved. Therefore, even when subjected to vertical vibration, the function of supporting the upper structure 13 and the function of sliding the upper collar 2 to attenuate the horizontal force are less likely to be impaired, and the performance as designed as the sliding rubber bearing 1 is stable. Can be demonstrated.

  Further, since there is no gap between the upper surface of the rubber laminate 6 and the lower surface of the upper flange portion 5 and between the lower surface of the rubber laminate 6 and the upper surface of the lower collar 8, foreign substances such as sand enter. Therefore, deterioration of each member is not promoted. Further, since the upper flange portion 5 having the sliding member 4 fixed to the surface is integrally fixed to the upper surface of the rubber laminate 6, an intermediate plate having the sliding member 4 fixed to the surface is separately provided as in the prior art. Since there is no need to prepare and positioning work for the intermediate plate (sliding member 4), which is troublesome for fine adjustment, is also unnecessary, the installation work for the sliding rubber support 1 can be simplified.

  In this embodiment, since the upper surface periphery of the sliding member 4 is chamfered over the entire periphery, there is no problem such that the stainless steel plate 3 is caught by the upper surface periphery of the sliding member 4, and the upper plate is stably 2 can be slid.

  The key groove 12b and the shear key 11b formed in the lower steel plate 7 and the lower iron 8 are omitted, and the lower surface of the rubber laminated body 6 and the upper surface of the lower iron 8 are not fixed, and the rubber laminated body 6 is lowered. It is also possible to adopt a structure that is placed on the upper surface of 8. In this structure, the rubber laminate 6 and the upper flange portion 5 (sliding member 4) can be separated from each other in the vertical direction between the rubber laminate 8 and the lower collar 8 when subjected to vertical vibration. Since there is no divergence in the vertical direction, the stability in the vertical direction is improved as compared with the conventional sliding rubber bearing.

  Incidentally, a slight gap is generated on the fitting surface between the upper flange portion 5 and the side block 9 due to the dimensional accuracy and the mounting accuracy in manufacturing. This gap may increase over time due to deformation of each member. If this gap becomes large, even if the notch portion 5a and the fitting portion 9a are fitted, the horizontal movement of the upper flange portion 5 cannot be regulated and cannot be made stationary.

  Therefore, as illustrated in FIG. 4, a gap sliding member 4a may be interposed in the gap between the fitting surfaces of the notch part 5a and the fitting part 9a to fill the gap. The gap sliding member 4a is fixed to the notch portion 5a or the fitting portion 9a. The gap sliding member 4a can be interposed only in the gap in the bridge axis direction or in the gap perpendicular to the bridge axis direction.

  According to this structure, the horizontal movement of the upper flange portion 5 can be completely restricted to ensure an immobile state, and the rubber laminate 6 is not sheared. Since the upper flange portion 5 can slide relative to the side block 9 in the vertical direction, the function of supporting the upper structure 13 is not impaired.

  A screw hole 9c is formed in the side block 9, and a gap sliding member 4a is inserted into the screw hole 9c. It can also be interposed in the gap between the mating surfaces. In FIG. 4, this mechanism is applied to the gap in the direction perpendicular to the bridge axis, but can also be applied to the gap in the bridge axis direction.

It is a front view which illustrates the sliding rubber bearing body of this invention and shows a right half in cross section. It is AA sectional drawing of FIG. It is a side view of FIG. It is a top view which shows the modification of the fitting surface of the side block of FIG. 2, and a notch part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sliding rubber support body 2 Upper collar 2a Engagement flange part 3 Stainless steel plate 4 Sliding member 4a Gap sliding member 5 Upper flange part 5a Notch part 6 Rubber laminated body 6a Rubber layer 6b Steel sheet 7 Lower steel sheet 8 Lower collar 9 Side block 9a Fitting portion 9b Upper end engaging portion 9c Screw hole 9d Adjustment screw 10 Fixing bolt 11a, 11b Shear key 12a, 12b Key groove 13 Upper structure 14 Lower structure

Claims (4)

  A rubber laminate in which rubber layers and steel plates are alternately laminated is disposed between an upper iron fixed to the lower surface of the upper structure and a lower iron fixed to the upper surface of the lower structure, and the lower surface of the upper iron and the rubber In the sliding rubber bearing body provided with a sliding member between the upper surface of the laminated body and a regulating means for regulating horizontal movement of the sliding member, the rubber laminated body is fixed to the upper surface of the rubber laminated body. The upper flange portion is integrally joined, and a notch portion provided at both ends of the upper flange portion in a direction perpendicular to the bridge axis, and a side block that is erected on the lower collar and fitted into the notch portion. A sliding rubber bearing body which constitutes the restricting means.   The sliding rubber bearing body according to claim 1, wherein a lower surface of the rubber laminate and an upper surface of a lower collar are fixed.   The sliding rubber bearing body according to claim 1 or 2, wherein a chamfer is formed on a peripheral edge of the upper surface of the sliding member.   The sliding rubber bearing body according to any one of claims 1 to 3, wherein a gap sliding member fixed to the notch or the side block is interposed in a gap between the fitting surfaces of the notch and the side block.

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