JP2008232190A - Laminated rubber bearing and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent a plug used for a laminated rubber bearing from bulging out to rubber layers over the whole laminated rubber bearing. <P>SOLUTION: In the laminated rubber bearing, a plurality of rubber layers 13A and a plurality of reinforcing plates 12 are alternately laminated between a lower part base plate 14A and an upper part base plate 14B. Holes 16 are provided substantially vertically through respective layers of the rubber layers 13A and the reinforcing plates 12. A lead plug 17 is press-fit into the hole 16 by a predetermined filling factor. For a long laminated sheet 18 formed in a tapered shape, an elastic layer composed of a rubber member and the like is bonded to a tensile strength member such as a woven fabric and a knitted fabric. The laminated sheet 18 is wound around the lead plug 17 independently at each rubber layer 13A. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a laminated rubber bearing that attenuates vibration by plastic deformation of a plug inserted into the laminated rubber.

  Rubber layers and reinforcing plates such as steel plates are laminated alternately in the vertical direction to make laminated rubber, and the laminated rubber is provided with holes that penetrate each layer, and a laminated rubber bearing with a pillar-shaped lead plug for dampers inserted into it. Seismic devices are known. The lead plug is sheared and deformed, for example, in the horizontal direction along with the deformation of the laminated rubber while being surrounded by the rubber layer and the reinforcing plate. At this time, the lead plug is plastically deformed to absorb the kinetic energy and attenuate the vibration of the supported body such as the bridge girder.

However, in the laminated rubber bearing, the lead plug bulges into the rubber layer over time and bites into the rubber layer. Therefore, the bulged lead plug interferes with the reinforcing plate and deforms the reinforcing plate when the laminated rubber is deformed. Thereby, there exists a problem of bringing about destruction and peeling of a rubber layer, or the premature destruction of a lead plug. In particular, when the laminated rubber bearing is used for supporting a bridge such as a road bridge, etc., when the displacement of the supported body is large (for example, displacement due to the rotation of a girder, etc.), the rubber layer is thickened (for example, the distance between the reinforcing plates is 15 mm to 40 mm), since the plug diameter needs to be set thick, the reinforcing plate is greatly deformed by the interference of the lead bulging portion. Therefore, durability in the laminated rubber bearing used for a bridge etc. falls remarkably. On the other hand, with respect to the problem of the swelling of the lead plug into the rubber layer, there has been proposed one in which the entire circumference of the lead plug is surrounded by a cloth member and the swelling of the lead plug into the rubber layer is restricted (patent) Reference 1).
JP 2000-0665140 A

  However, in the laminated rubber bearing used under a particularly large displacement, the lead plug is greatly stretched in the axial direction due to the shear deformation in the horizontal direction (for example, about four times the initial length). For this reason, when the entire lead plug is covered with a cloth member in order to suppress the swelling of the lead plug as in Patent Document 1, the cloth member hardly extends in the axial direction. The part and the lower part are almost exposed from the cloth member. Therefore, the bulge of the lead plug to the rubber layer cannot be suppressed in such a portion, and a sufficient effect cannot always be obtained.

  An object of the present invention is to effectively suppress bulging of a plug used in a laminated rubber bearing to a rubber layer throughout the laminated rubber bearing.

  The laminated rubber bearing of the present invention includes laminated rubber in which rubber layers and reinforcing plates are alternately laminated, a plug for a damper inserted through each layer of the laminated rubber, and each rubber layer independently wound around the plug. And a bulging of the plug to each rubber layer is prevented by the tensile member.

  The tensile member is preferably a woven fabric, a woven fabric, or a wire mesh. The tensile member is a long sheet member, and the sheet member is preferably wound a plurality of times around the plug. In addition, the sheet member preferably has a tapered planar shape in which at least the front end side thereof becomes narrower along the longitudinal direction, and at this time, the sheet member is wound with the wide portion inside. The sheet member preferably includes an elastic layer.

  The method for manufacturing a laminated rubber bearing according to the present invention also includes a plurality of rubber members and a plurality of reinforcing plates that are alternately fitted and laminated on a dummy plug, vulcanized and molded, and then a damper is formed in the hole from which the dummy plug is removed. A method of manufacturing a laminated rubber bearing by press-fitting a plug for use, and before a rubber member of each step is fitted to a dummy plug, a tensile strength member around the dummy plug at a position corresponding to the fitted rubber member It is characterized by having a step of winding.

  As described above, according to the present invention, the bulging of the plug used for the laminated rubber bearing to the rubber layer can be effectively suppressed throughout the laminated rubber bearing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an overview of a laminated rubber bearing according to an embodiment of the present invention, and FIG. 2 is a side sectional view of the laminated rubber bearing taken along line II-II in FIG.

  The laminated rubber bearing of this embodiment is provided with a hole perpendicular to the reinforcing plate in laminated rubber obtained by alternately laminating a plurality of rubbers (hardness A8-12 in JISK6253) and a plurality of reinforcing plates, A plug for a damper made of lead or the like is press-fitted into the pipe. As shown in FIG. 1, in the present embodiment, the laminated rubber bearing 10 has a substantially rectangular parallelepiped shape, for example. In the laminated rubber 11, as shown in FIG. 2, a plurality of reinforcing plates 12 are arranged in parallel at predetermined intervals, and a rubber layer 13 </ b> A is provided between the reinforcing plates 12.

  For example, a thin plate steel plate is used as the reinforcing plate 12, and a base plate having a relatively thick thickness is provided at the uppermost portion and the lowermost portion of the laminated rubber 11. 14A and 14B (plate members that maintain rigidity against deformation of the laminated rubber) are disposed. Further, the flange plates 15A and 15B are attached to the base plates 14A and 14B, respectively, using attachments (not shown) such as bolts.

  FIG. 1 shows a state before the flange plates 15A and 15B are attached. The rubber layer 13A is slightly larger than the reinforcing plate 12, and the reinforcing plate 12 and the base plates 14A and 14B are surrounded by the rubber member 13 including the rubber layer 13A.

  The laminated rubber 11 is provided with, for example, four cylindrical holes 16 penetrating from the upper base plate 14B to the lower base plate 14A and substantially perpendicular to each layer. A cylindrical lead plug 17 is press-fitted into each of the four holes 16 at a predetermined filling rate. In the hole 16, a laminated sheet 18 in which a woven fabric or a knitted fabric and rubber are overlapped is disposed at a position corresponding to each rubber layer 13 </ b> A to form an inner peripheral surface of the hole 16 in the rubber layer 13 </ b> A.

  FIG. 3 is an enlarged cross-sectional view of the periphery of the lead plug 17, and FIG. 4 is a plan view of the laminated sheet 18. FIG. 5 is a partially enlarged perspective view showing the structure of the laminated sheet 18.

  As shown in FIG. 3, the laminated sheet 18 forms the inner peripheral surface of the hole 16 provided in the rubber layer 13A. Further, as shown in FIG. 4, the laminated sheet 18 includes a wide portion 18A that is substantially symmetrical in the longitudinal direction and has a constant width over a predetermined length (for example, one turn), and the wide portion 18A. It is a belt-like sheet member provided with a taper portion 18B formed into a taper shape that extends and narrows toward the tip, and is wound around the hole 16 with the wide portion 18A being the inner side and the taper portion 18B being the outer side. .

  As shown in FIG. 5, the laminated sheet 18, such as a woven fabric or a knitted fabric, hardly expands or contracts at least in the longitudinal direction of the sheet, and has sufficient strength (resistance) against distortion of the lead plug 17 in the horizontal direction. An elastic member (high altitude A8 to 12) 20 such as rubber is bonded or welded to the tensile member 19 (elastic layer).

  FIG. 6 schematically shows a state of the laminated sheet 18 wound around the lead plug 17 as a perspective view. As shown in FIGS. 3 and 6, since the laminated sheet 18 is formed in a tapered shape, the sheet width becomes narrower from the inside toward the outside. Therefore, in the cross section of the wound laminated sheet 18, The outline becomes narrower as it goes outward in a staircase shape, and for example, a staircase-like contour line along a substantially arc is formed.

Next, with reference to FIG. 7, the manufacturing process of the laminated rubber support 10 of this embodiment is demonstrated.
First, dummy plugs 21 are respectively fitted into the four holes 16 provided in the lower base plate 14A, and the laminated sheet 18 is wound around each dummy plug 21 as shown in FIG.

  Next, the plate-like rubber member 131 is placed on the lower base plate 14A. That is, the plate-like rubber member 131 is a rubber member for forming the lowermost (first layer) rubber layer 13A, and holes 131A are provided at positions corresponding to the dummy plugs 21, respectively. Each hole 131A is fitted into the dummy plug 21, and the rubber member 131 is placed on the lower base plate 14A. At this time, the diameter of the hole 131A is made large enough to receive the laminated sheet 18 wound around the dummy plug 21.

  Next, the reinforcing plate 121 constituting the first layer of the plurality of reinforcing plates 12 is placed on the rubber member 131. The reinforcing plate 121 is provided with holes 16 corresponding to the dummy plugs 21 and having substantially the same diameter. Each hole 16 of the reinforcing plate 121 is fitted to each of the dummy plugs 21, and the reinforcing plate 121 is placed on the rubber member 131 in this state.

  Thereafter, the laminated sheets 18 are respectively wound again around the dummy plug 21, and the rubber member 132 forming the second layer is fitted into the dummy plug 21 in the hole 132 </ b> A in the same manner as the rubber member 131. Placed on the top. Similarly, the operation of placing the second-layer reinforcing plate 122 on the rubber member 132 and winding the laminated sheet 18 around the dummy plug 21 is repeated. As a result, the rubber member and the reinforcing plate are alternately stacked in a predetermined number of stages, and finally the upper base plate 14B is placed on the rubber member that forms the uppermost rubber layer.

  In FIG. 7, the rubber member 131 forming the first layer of the rubber layer 13A is placed on the lower base plate 14A, and the first-layer reinforcing plate 121 is placed thereon. A state in which the laminated sheet 18 is wound around one of the dummy plugs 21 is shown.

  When the rubber member (131, 132, etc.), the reinforcing plate 12, and the laminated sheet 18 are stacked on the lower base plate by a predetermined number of stages and the upper base plate 14B is placed thereon, a predetermined number of them are set in the mold. Vulcanization is performed under pressure and temperature. Thereby, the rubber members constituting each rubber layer 13A are welded to each other, the plurality of reinforcing plates 12 arranged in parallel at a predetermined interval are sealed in the rubber member 13, and the laminated rubber 11 is integrally molded. Further, after the vulcanization molding, the dummy plugs 21 are respectively extracted from the holes 16 and the lead plugs 17 are press-fitted into the holes 16 at a predetermined filling rate. Thereby, the laminated rubber bearing 10 of this embodiment is obtained.

  Next, with reference to FIG. 8, the effect | action of the laminated rubber bearing 10 of this embodiment is demonstrated. FIG. 8 is a partially enlarged cross-sectional view schematically showing the inside of the laminated rubber support 10 in a state where it is sheared and deformed in the horizontal direction.

  When a vertical load (compression force) P is applied to the laminated rubber support 10 (see FIG. 2), the lead plug 17 tends to expand in the horizontal direction. In the portion surrounded by the reinforcing plate 12, the lead plug 17 is restricted by the reinforcing plate 12 and its periphery is restricted, so that it cannot bulge in the horizontal direction, but only by a rubber member like a conventional rubber bearing. When restraining the periphery of the lead plug 17, since the restraining force with respect to the lead plug 17 is not sufficient in the portion surrounded by the rubber layer 13A, lead swells in the rubber layer 13A.

  However, in the laminated rubber support 10 of this embodiment, since the laminated sheet 18 including the tensile member 19 is wound around the lead plug 17 in each rubber layer 13A, the expansion of the lead plug 17 to the rubber layer 13A is performed. It is prevented from coming out. Further, when the laminated rubber support 10 is greatly sheared in the horizontal direction, the lead plug 17 is greatly elongated in the longitudinal direction, but in this embodiment, the laminated sheet 18 is provided independently for each rubber layer 13A. Therefore, the laminated sheet 18 stays in each rubber layer 13 </ b> A, and the gap is slightly generated between each reinforcing plate 12. Therefore, even when the laminated rubber support 10 is greatly sheared in the horizontal direction, the laminated sheet 18 prevents the lead plug 17 from bulging out to the respective rubber layers 13A.

  Furthermore, in this embodiment, since the laminated sheet 18 has a tapered shape, the width of the laminated sheet 18 that is wound becomes narrower as it goes outward, and the laminated rubber support 10 is deformed in the horizontal direction. Even in this case, the laminated sheet 18 can rotate without interfering with the reinforcing plate 12, and deformation of the reinforcing plate 12 can be suppressed. Thereby, peeling and destruction of the rubber layer and destruction of the lead plug 17 can be suppressed. In addition, since the shape of the rubber in contact with the laminated sheet 18 in each rubber layer 13A is gradually inclined with respect to the plug axial direction, the separation and destruction of the rubber layer are further suppressed.

  Moreover, since the area where the laminated sheet 18 is in contact with the reinforcing plate 12 is small even with respect to the vertical load, it is possible to prevent the load from being carried by the laminated sheet 18 and increasing the rigidity of the laminated rubber bearing as a whole. Thereby, a big deformation | transformation of the laminated rubber support 10 by girder rotation can be accept | permitted, for example.

  In the present embodiment, since the laminated sheet 18 is wound around the lead plug 17 a plurality of times, the necessary strength can be easily adjusted and secured, and the laminated sheet 18 is provided with an elastic layer by the elastic member 20. Thus, the laminated sheet 18 can be given sufficient restraining force and flexible, so that the lead plug 17 can exert a damping force without impairing the horizontal / vertical performance of the laminated rubber 11.

  As described above, according to the present embodiment, the tensile strength member is independently wound around the plug corresponding to each rubber layer, so that the horizontal and vertical performance of the laminated rubber support is not impaired. Can be effectively prevented throughout the laminated rubber bearing, and the durability of the laminated rubber bearing can be improved.

  In this embodiment, a woven fabric or a knitted fabric is used as an example of the tensile member. However, the tensile member has sufficient tensile strength in at least the longitudinal direction, such as a metal net, and has sufficient flexibility in the surface direction. If it is a member which has, it will not be limited to embodiment. In this embodiment, the rubber layer is provided as the laminated sheet. However, if the tensile member has sufficient flexibility in the surface direction, the rubber layer can be omitted. Furthermore, in this embodiment, the laminated sheet is wound a plurality of times, but when the strength is sufficient, the winding may be single.

  In this embodiment, the shape of the laminated rubber is a rectangular parallelepiped, but it may be other shapes such as a cylindrical shape, the number of lead plugs may be one or more, and the damper plug is also limited to lead. It is not something.

  In the present embodiment, the taper-shaped laminated sheet is wound. However, for example, a member including a laminated (or concentric) tensile member and having an outer contour line in a cross-sectional shape in an arc shape is formed in advance. In addition, it is possible to adopt a configuration in which this can be fitted into the dummy plug.

  In addition, since the lamination sheet of this embodiment was provided with the wide part whose width | variety is constant over predetermined length, the plug was able to be restrained more firmly in this part. However, a laminated sheet does not necessarily require a wide part, and the whole may be a tapered part.

It is a perspective view which shows the general view of the laminated rubber bearing which is one Embodiment of this invention. It is a sectional side view of the laminated rubber bearing along the II-II line of FIG. It is an expanded sectional view of the peripheral part of a lead plug. It is a top view of a lamination sheet. It is a partial expansion perspective view which shows the structure of a lamination sheet. It is a perspective view which shows the state of the lamination sheet wound around the lead plug. It is a perspective view for demonstrating the manufacturing process of a laminated rubber bearing. It is a partial expanded sectional view which represents typically the mode of the inside in the state where the lamination rubber bearing was shear-deformed in the horizontal direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Laminated rubber support 11 Laminated rubber 12 Reinforcement plate 13A Rubber layer 17 Lead plug 18 Laminated sheet 19 Tensile member 20 Rubber member

Claims (6)

Laminated rubber with alternately laminated rubber layers and reinforcing plates;
A damper plug inserted through each layer of the laminated rubber;
A tensile member wound independently around the plug for each rubber layer;
The laminated rubber bearing, wherein the bulge of the plug to each rubber layer is prevented by the tensile member.   The laminated rubber bearing according to claim 1, wherein the tensile member is any one of a woven fabric, a woven fabric, and a wire mesh.   The laminated rubber bearing according to claim 1, wherein the tensile member is a long sheet member, and the sheet member is wound a plurality of times around the plug.   4. The sheet member according to claim 3, wherein the sheet member has a tapered planar shape in which at least a tip end side thereof becomes narrow along a longitudinal direction, and the sheet member is wound with a wide portion of the sheet member as an inner side. Laminated rubber bearing as described in 1.   The laminated rubber bearing according to claim 3, wherein the sheet member includes an elastic layer. Multiple rubber members and multiple reinforcing plates are alternately fitted and laminated on a dummy plug, vulcanized and molded, and then a damper plug is press-fitted into the hole from which the dummy plug is removed to produce a laminated rubber bearing. A way to
A step of winding a tensile member around the dummy plug at a position corresponding to the rubber member to be fitted before the rubber member of each stage is fitted to the dummy plug. Method.

Images