JP7371312B2 - Manufacturing method of laminated rubber bearing with lead plug - Google Patents

Description

The present invention relates to a method of manufacturing a laminated rubber bearing containing a lead plug.

Some laminated rubber bearings have columnar lead plugs embedded in them, as shown in Patent Document 1, for example. In laminated rubber bearings with lead plugs, as the laminated rubber deforms during an earthquake, the lead plugs plastically deform, absorbing seismic energy and damping vibrations.

A laminated rubber bearing containing a lead plug is generally formed by inserting a columnar lead plug into a through hole that vertically passes through the laminated rubber. The upper and lower surfaces of the laminated rubber are covered with steel plates.

Japanese Patent Application Publication No. 2015-132303

In the conventional laminated rubber bearing with lead plugs, when repeated shear deformation occurs, the restraining force of the rubber layer (rubber plate) of the laminated rubber is small, so the lead plug deforms and breaks through the rubber layer, causing the laminated rubber bearing to deform. There was a risk that lead would be exposed on the outer surface of the rubber. If such deformation occurs, it will no longer be possible to exhibit stable damping performance as a seismic isolation bearing, and there is concern that lead will be adversely affected by the environment due to exposure to the outside air.

In addition, in conventional laminated rubber bearings with lead plugs, when pressure is applied to the lead plugs due to the deformation of the laminated rubber due to repeated vertical and horizontal loads, there is a gap between the upper and lower steel plates and the laminated rubber. Gaps may form and lead may be exposed. Even if such deformation occurs, it will be a hindrance to seismic isolation, making it impossible to exhibit stable damping performance, and there is also concern about the negative impact on the environment due to lead being exposed to the outside air.

Furthermore, in conventional laminated rubber bearings with lead plugs, the lead plug is later inserted into the through hole formed in the laminated rubber, so there is a gap between the laminated rubber (inner circumferential surface of the through hole) and the lead plug. It will happen. If there is a gap between the laminated rubber and the lead plug, when shear deformation occurs, the lead plug cannot be restrained with uniform pressure, which may reduce damping performance.

From this perspective, the present invention provides a laminated rubber bearing with a lead plug that can exhibit stable damping performance even when large deformation occurs, and that does not have a negative impact on the surrounding environment. The task is to propose a manufacturing method for.

A method of manufacturing a laminated rubber bearing with a lead plug according to the present invention to solve the above problem includes a plurality of rubber plates and metal plates each having through holes formed at predetermined positions, and a plurality of rubber plates and metal plates having through holes formed in the through holes on the outer circumferential surface, upper surface, and lower surface. The method includes a lamination step in which the rubber plates, metal plates, and lead plugs covered with an elastic covering material are alternately laminated with the lead plugs inserted therethrough, and a molding step in which the rubber plates, metal plates, and lead plugs are vulcanized and molded.

According to this method of manufacturing a laminated rubber bearing containing a lead plug, since the laminated rubber, the lead plug, and the elastic covering material are integrally vulcanized and manufactured, pressure can be applied evenly to the lead plug. As a result, it is possible to manufacture a laminated rubber bearing containing lead plugs that exhibits stable damping performance.

The second method of manufacturing a laminated rubber bearing containing a lead plug of the present invention includes a plug installation step of arranging a lead plug whose outer peripheral surface, upper surface, and lower surface are covered with an elastic coating material on the upper surface of a lower mold; The method includes a laminating step of forming a laminated rubber on the upper surface of a mold, and a molding step of vulcanizing and molding the laminated rubber and lead plug. In the plug installation step, a fixing pin fixed to the lower mold is inserted into a recess formed on the lower surface of the lead plug. In addition, in the lamination process, a lower steel plate having a through hole formed in a predetermined position is placed on the lower mold with the lead plug inserted into the through hole, and Alternately stacking a plurality of rubber plates and metal plates with through holes formed on the lower steel plate with the lead plugs inserted into the through holes, and a top plate with through holes formed in predetermined positions. placing the steel plate on the upper surface of the laminate of the rubber plate and the metal plate with the lead plug inserted into the through hole; and placing the upper mold on the upper surface of the upper steel plate and removing the lead plug. A fixing pin fixed to the upper mold is inserted into a recess formed on the upper surface of the plug. Further, in the molding step, vulcanization molding is performed in a state in which the lead plug is prevented from slipping with respect to the lower mold and the upper mold by the upper and lower fixing pins.

Furthermore, the third method of manufacturing a laminated rubber bearing containing a lead plug of the present invention includes a plug installation step of arranging a lead plug whose outer peripheral surface, upper surface, and lower surface are covered with an elastic coating material on the upper surface of the lower steel plate; The method includes a laminating step of forming a laminated rubber on the upper surface of a steel plate, and a molding step of vulcanizing and molding the laminated rubber and lead plug. In the plug installation step, a fixing pin fixed to the lower steel plate is inserted into a recess formed on the lower surface of the lead plug. In the lamination step, a plurality of rubber plates and metal plates each having through holes formed at predetermined positions are alternately laminated on the lower steel plate with the lead plugs inserted into the through holes; An upper steel plate is placed on the upper surface of the laminate of the rubber plate and the metal plate, and a fixing pin fixed to the upper steel plate is inserted into a recess formed on the upper surface of the lead plug. Further, in the forming step, vulcanization is performed in a state where the lead plug is prevented from slipping relative to the lower steel plate and the upper steel plate by the upper and lower fixing pins.

According to the second and third manufacturing methods for laminated rubber bearings with lead plugs, the fixing pin prevents the lead plug from shifting during vulcanization molding, so high-quality laminated rubber with lead plugs can be manufactured. can do.
Note that the volume of the lead plug before vulcanization molding may be made larger than the volume of the lead plug after vulcanization molding, and the volume of the lead plug may be reduced in the molding process.

According to the manufacturing method of a laminated rubber bearing with a lead plug of the present invention, even when large deformation occurs, stable damping performance can be exhibited, and adverse effects on the surrounding environment can be prevented. be able to.

It is a front view showing an example of use of the laminated rubber bearing according to the present invention. It is a sectional view showing a laminated rubber bearing concerning a first embodiment. (a) is an exploded perspective view of the plug 3 of the first embodiment, and (b) and (c) are perspective views showing elastic covering materials according to other embodiments. FIG. 3 is a cross-sectional view showing each construction stage of the plug installation process of the method for manufacturing a laminated rubber bearing according to the first embodiment, in which (a) shows the installation status of the end plate material, (b) shows the installation status of the lead plug, and (c ) shows the installation status of the side panels. FIG. 3 is a cross-sectional view showing each construction stage of the lamination process of the manufacturing method of the laminated rubber bearing of the first embodiment, in which (a) shows the installation status of the lower steel plate, (b) shows the lamination status of the laminated rubber, and (c) shows the lamination status of the laminated rubber bearing. This is the installation status of the upper steel plate. It is a sectional view showing a laminated rubber bearing concerning a second embodiment. FIG. 6 is a cross-sectional view showing each construction stage of the method for manufacturing a laminated rubber bearing according to the second embodiment, in which (a) shows the installation status of the lower steel plate, (b) shows the installation status of the lead plug, and (c) shows the installation status of the laminated rubber bearing. This is the lamination situation. It is a sectional view showing a laminated rubber bearing concerning a third embodiment. FIGS. 3A and 3B are sectional views showing each construction stage of the method for manufacturing a laminated rubber bearing according to the third embodiment, in which (a) shows a lead plug installation situation, (b) a lamination situation of laminated rubber, and (c) a top steel plate. Installation status.

<First embodiment>
In the first embodiment, as an example, as shown in FIG. 1, a laminated rubber support 1 interposed between an upper structure B1 and a lower structure B2 of a bridge will be described. The laminated rubber bearing 1 of this embodiment is a laminated rubber bearing containing a lead plug, which includes a laminated rubber 2, a plug 3, and a steel plate 4, as shown in FIG.

The laminated rubber 2 is formed by alternately laminating rubber plates 21 and metal plates 22. Although the laminated rubber 2 of this embodiment has a cylindrical shape, the shape of the laminated rubber 2 is not limited to a cylindrical shape, and may be, for example, a prismatic shape. Further, the number of rubber plates 21 and metal plates 22 is not limited, and may be determined as appropriate.

The rubber plate 21 is made of, for example, a plate-shaped natural rubber. A through hole 23 through which the plug 3 is inserted is formed in the center of the rubber plate 21 . Although the elastic modulus of the rubber plate 21 is not limited, in this embodiment, one within the range of 1.0 to 6.5 MPa is used. Note that the position, number, and shape of the through holes 23 of the rubber plate 21 are not limited, and may be appropriately determined according to the arrangement and shape of the plug 3. Further, the thickness and area of the rubber plate 21 may be appropriately determined depending on the weight, allowable displacement, etc. of the member (upper structure B1) placed on the laminated rubber support 1. Further, the material constituting the rubber plate 21 is not limited to natural rubber, and may be, for example, high damping rubber.

The metal plate 22 is made of a steel plate that has the same planar shape as the rubber plate 21 and is circular in plan view. A through hole 24 for inserting the plug 3 is formed in the metal plate 22 at a position corresponding to the through hole 23 of the rubber plate 21. Note that the thickness of the metal plate 22 is not limited, and may be appropriately determined depending on the weight of the member (upper structure B1) placed on the laminated rubber support 1, the hardness of the rubber plate 21, etc.

The plug 3 is embedded in the center of the laminated rubber 2. The plug 3 penetrates through holes 23 and 24 in the rubber plate 21 and the metal plate 22 that constitute the rubber lamination 2, and the upper and lower ends of the plug 3 protrude from the upper and lower surfaces of the rubber lamination 2, respectively. . In addition, in this embodiment, one plug 3 is arranged in the center of the laminated rubber 2, but the number and arrangement of the plugs 3 are not limited. For example, four plugs 3 may be arranged at intervals in the center of the laminated rubber 2.

The plug 3 consists of a lead plug 31 and an elastic covering material 32.
The lead plug 31 has a cylindrical shape. Note that the shape of the lead plug 31 is not limited to a cylindrical shape, and may be, for example, a prismatic shape. The lead plug 31 of this embodiment is made of lead with an elastic modulus within the range of 5000 to 6000 MPa. Note that the material constituting the lead plug 31 is not limited.

An elastic covering 32 covers the outer surface of the lead plug 31. The elastic covering material 32 is desirably made of a material with higher hardness than the rubber plate 21, but may be made of the same material as the rubber plate 21. The elastic covering material 32 of this embodiment is made of natural rubber, and the shear modulus and bending modulus of the elastic covering material 32 are within the range of 2.0 to 14.0 MPa and 1000 to 82000 MPa, respectively. Note that the material constituting the elastic covering material 32 is not limited, and may be, for example, high-damping rubber or other resin-based materials. Furthermore, the shear modulus and bending modulus of the elastic covering material 32 are not limited to the above ranges. Furthermore, the thickness of the elastic covering material 32 may be determined as appropriate.

The upper and lower surfaces of the laminated rubber 2 are covered with steel plates 4 (an upper steel plate 41 and a lower steel plate 42). Through holes 43 are formed in the steel plate 4 in correspondence with the positions of the plugs 3. The upper end of the plug 3 (the part protruding from the upper surface of the laminated rubber 2) is inserted into the through hole 43 of the upper steel plate 41, and the lower end of the plug 3 (the part protruding from the lower surface of the laminated rubber 2) is inserted into the through hole 43 of the upper steel plate 41. , is inserted into the through hole 43 of the lower steel plate 42. The upper surface and lower surface of the plug 3 correspond to the upper surface of the upper steel plate 41 and the lower surface of the lower steel plate 42, respectively (they are flush with each other).

Hereinafter, a method for manufacturing the laminated rubber bearing 1 will be explained. The method for manufacturing the laminated rubber bearing 1 includes a plug installation process, a lamination process, and a molding process.
The plug installation step is a step of installing the elastic covering material 32 on the outer surface of the cylindrical lead plug 31 to form the plug 3. In this embodiment, the plug 3 is formed on the mold 5, but the plug 3 may be formed at a location other than the mold 5.

In this embodiment, as shown in FIG. 3A, a natural rubber side plate material 33 is wrapped around the outer peripheral surface of the lead plug 31, and natural rubber end plate members 34 are wrapped around the top and bottom surfaces of the lead plug 31. Attach. That is, the side surface plate material 33 and the end surface plate materials 34, 34 constitute the elastic covering material 32. Note that the side plate material 33 to be wrapped around the lead plug 31 has the same width as the height of the lead plug 31 and the same length as the circumference of the lead plug 31. Further, the end plate material 34 that covers the top or bottom surface of the lead plug 31 is made of a circular plate material having a radius equal to the radius of the lead plug 31 plus the thickness of the side plate material 33.

Note that the method of forming the elastic covering material 32 is not limited. For example, as shown in FIG. 3(b), the side surface of the lead plug 31 may be covered by laminating a ring-shaped elastic material (such as rubber) 33a along the outer surface of the lead plug 31. Alternatively, as shown in FIG. 3(c), a band-shaped elastic material (such as rubber) 33b may be spirally wound around the outer peripheral surface of the lead plug 31. Alternatively, the lead plug 31 may be inserted into a vulcanized elastic material (such as rubber) and attached to the outer surface of the lead plug 31.

In the plug installation process, first, as shown in FIG. 4(a), the lower end plate material 34 is placed on the mold (lower mold) 5. A fixing pin 51 is implanted in the mold 5. A through hole 35 is formed in the center of the end surface plate material 34, and the end surface plate material 34 is placed with the fixing pin 51 inserted into the through hole 35. Next, as shown in FIG. 4(b), the lead plug 31 is placed on the end face plate material 34. A recess 36 is formed in the lead plug 31 in correspondence with the position of the fixing pin 51, and the upper end of the fixing pin 51 is inserted into the recess 36. Subsequently, as shown in FIG. 4C, after the side surface plate material 33 is provided around the outer periphery of the lead plug 31, the end surface plate material 34 is placed on the upper surface of the lead plug 31. A recess 36 is formed on the upper surface of the lead plug 31, and a through hole 35 is formed in the end plate material 34 placed on the upper surface of the lead plug 31, corresponding to the position of the recess 36.

The lamination process is a process of laminating a plurality of rubber plates 21 and a plurality of metal plates 22. First, as shown in FIG. 5(a), the lower steel plate 42 is placed on the upper surface of the mold 5. At this time, the lead plug 31 whose outer surface is covered with the elastic covering material 32 is inserted into the through hole 43 of the lower steel plate 42 . Next, as shown in FIG. 5(b), the rubber plates 21 and metal plates 22 are alternately laminated on the lower steel plate 42. At this time, a lead plug 31 whose outer surface is covered with an elastic covering material 32 is inserted into the through holes 23 and 24 of the rubber plate 21 and the metal plate 22. After a predetermined number of rubber plates 21 and metal plates 22 are laminated, the upper steel plate 41 is placed on the upper surface of the laminated rubber 2, as shown in FIG. 5(c). At this time, the upper part of the plug 3 is inserted into the through hole 43 of the upper steel plate 41. Subsequently, a mold (upper mold) 5 is placed on the upper surface of the upper steel plate 41. A fixing pin 51 is implanted in the mold 5, and the fixing pin 51 is inserted into the recess 36 of the lead plug 31 through the through hole 35 of the upper end plate 34.

In the forming process, the rubber plate 21, metal plate 22, lead plug 31, elastic covering material 32, and steel plate 4 are vulcanized and formed. Vulcanization molding is performed by compressing a mold 5 installed in a press machine (not shown) from above and below and heating it. By vulcanization molding, the laminated rubber 2 and the plug 3 are integrally molded, and the side surface plate material 33 and the end surface plate material 34 are integrated.

After vulcanization molding, the mold is removed. At the time of demolding, the fixing pin 51 is removed from the laminated rubber bearing 1 along with the mold 5. After removing the fixing pin 51, fill the recess 36 of the lead plug 31 with lead, and fill the through hole 35 of the end plate 34 with rubber (elastic material) made of the same material as the end plate 34, as shown in Fig. 2. The shown laminated rubber bearing 1 is completed (the recess 36 is omitted in FIG. 2). Note that if the shape of the recess 36 of the lead plug 31 is small enough not to affect the performance of the lead plug 31, the recess 36 may be filled with the same material as the through hole 35 (such as an elastic material).

As described above, according to the laminated rubber bearing 1 of this embodiment, the lead plug 31 is covered with the elastic covering material 32, so even if large deformation occurs during an earthquake, the lead will not be exposed to the outside surface. Never. That is, since the entire lead plug 31 is covered with the elastic covering material 32, lead is prevented from bulging not only from the laminated rubber 2 portion but also from the gap between the upper and lower steel plates 4, 4 and the laminated rubber 2. I can do it. Therefore, stable damping performance can be ensured, and lead is not exposed to the atmosphere, so there is no risk of adverse effects on the environment.

In addition, since the laminated rubber 2 and the plug 3 are vulcanized and manufactured as one unit, the elastic covering material 32 ensures adhesion to the laminated rubber 2 (rubber plate 21), and therefore the lead plug 31 is evenly pressured. can be restrained. Further, compared to the conventional manufacturing method in which the lead plug 31 is press-fitted after manufacturing the laminated rubber 2, stable damping performance can be obtained more efficiently.

Further, although the through holes 43 are formed in the upper steel plate 41 and the lower steel plate 42, the lead plugs 31 are not exposed to the outside air because they are covered with the elastic covering material 32.
When manufacturing the laminated rubber bearing 1 by vulcanization, the lead plug 31 is fixed to the mold 5 via the fixing pin 51, so the position of the lead plug 31 does not shift and high quality manufacturing is possible. can.

<Second embodiment>
The laminated rubber bearing 1 of the second embodiment is a laminated rubber bearing containing a lead plug, which includes a laminated rubber 2, a plug 3, a steel plate 4, and a lid member 6, as shown in FIG. In addition, since the details of the laminated rubber 2 of the laminated rubber bearing 1 of the second embodiment are the same as the laminated rubber 2 of the first embodiment, detailed explanation will be omitted.

The plug 3 is embedded in the center of the laminated rubber 2. The plug 3 passes through a through hole 23 in a rubber plate 21 and a metal plate 22 that constitute the laminated rubber 2. The total length (total height) of the plug 3 is greater than the height of the laminated rubber 2 and smaller than the overall height of the laminated rubber support 1 (the length from the upper surface of the upper steel plate 41 to the lower surface of the lower steel plate 42). Therefore, the upper and lower ends of the plug 3 protrude from the upper and lower surfaces of the laminated rubber 2 and are inserted into the through hole 43 of the upper steel plate 41 and the through hole 43 of the lower steel plate 42, respectively.

The plug 3 consists of a lead plug 31 and an elastic covering material 32.
An elastic covering 32 covers the outer surface of the lead plug 31. The width (diameter) of the portion of the elastic covering material 32 that covers the end surface (upper surface or lower surface) of the lead plug 31 is larger than the width (diameter) of the portion (general portion 37) that covers the side surface of the lead plug 31. Therefore, flange portions 38 projecting laterally are formed at the upper and lower ends of the elastic covering material 32, and the plug 3 has an I-shape when viewed from the side. The flange portion 38 functions as a fitting portion with the steel plate 4. Note that the flange portion 38 may be formed as necessary.
Other details of the plug 3 are the same as those of the plug 3 of the first embodiment, so a detailed explanation will be omitted.

Steel plate 4 (upper steel plate 41 and lower steel plate 42) covers the upper or lower surface of laminated rubber 2. A through hole 43 is formed in the upper steel plate 41 and the lower steel plate 42. The lower part of the through hole 43 of the upper steel plate 41 has the same area (inner diameter) as the outer shape (outer diameter) of the general part 37 of the plug 3, and the upper part of the through hole 43 has the same area (inner diameter) as the outer shape (outer diameter) of the flange part 38. They have the same area (inner diameter). Similarly, the lower part of the through hole 43 of the lower steel plate 42 has the same area (inner diameter) as the outer shape (outer diameter) of the general part 37 of the plug 3, and the upper part of the through hole 43 has the same outer shape (outer diameter) of the flange part 38. diameter) and the same area (inner diameter). The thickness of the steel plate 4 is greater than the height of the protruding portion of the plug 3 from the laminated rubber 2. Therefore, a gap is formed in the through hole 43 of the upper steel plate 41 above the upper end surface of the plug 3. Similarly, in the through hole 43 of the lower steel plate 42, a gap is formed below the lower end surface of the plug 3. A gap between each through hole 43 is covered by a lid member 6. That is, in the laminated rubber bearing 1 of the second embodiment, the through hole 43 of the steel plate 4 is shielded by the cover member 6. The outer circumferential surface of the lid member 6 is male threaded, and the inner surface of the through hole 43 is female threaded. The lid member 6 is fixed by screwing into the through hole 43. Note that the method of fixing the lid member 6 is not limited. Further, the shape of the through hole 43 may be formed according to the shape of the plug 3, and does not necessarily have to have an enlarged diameter.

Next, a method for manufacturing the laminated rubber bearing 1 of the second embodiment will be described. The method for manufacturing the laminated rubber bearing 1 includes a plug installation process, a lamination process, and a molding process.
The plug installation process is a process of installing a cylindrical lead plug 31 on the mold 5. In this embodiment, the plug 3 is formed on the mold 5, but the plug 3 may be formed at a location other than the mold 5.

In this embodiment, the plug 3 is formed by wrapping a side plate material 33 made of natural rubber around the outer peripheral surface of the lead plug 31 and attaching end plate materials 34 made of natural rubber to the top and bottom surfaces of the lead plug 31. do.
In the plug installation process, first, as shown in FIG. 7(a), the lower steel plate 42 is placed on the mold 5. At this time, the lid material 6 is fixed in the through hole 43 of the lower steel plate 42 with the lower end plate material 34 inserted in advance. Next, as shown in FIG. 7(b), the lead plug 31 with the side surface plate material 33 provided around it is placed on the end surface plate material 34.

The lamination process is a process of laminating a plurality of rubber plates 21 and a plurality of metal plates 22, as shown in FIG. 7(c). The rubber plates 21 and the metal plates 22 are alternately laminated with the lead plugs 31 having the side plate material 33 arranged around them inserted into the through holes 23 and 24. After a predetermined number of rubber plates 21 and metal plates 22 are laminated, an upper steel plate 41 is placed on the upper surface of the laminated rubber 2. At this time, the upper end plate material 34 is inserted into the through hole 43 of the upper steel plate 41, and the lid material 6 is fixed. Subsequently, the mold 5 is placed on the upper surface of the upper steel plate 41.

In the forming process, the rubber plate 21, metal plate 22, lead plug 31, elastic covering material 32, and steel plate 4 are vulcanized and formed. Vulcanization molding is performed by compressing a mold 5 installed in a press machine (not shown) from above and below and heating it. By vulcanization molding, the laminated rubber 2 and the plug 3 are integrally molded. In addition, in the molding process, the lead plug 31 may be fixed by a fixing pin 51 (see FIGS. 4 and 5) fixed to the lid member 6.
After vulcanization molding, the laminated rubber bearing 1 shown in FIG. 6 is completed by demolding. When the fixing pin 51 is used in the molding process, the fixing pin 51 may be left in place.

As described above, according to the laminated rubber bearing 1 of the second embodiment, the lead plug 31 is covered with the elastic covering material 32, and the through hole 43 of the steel plate 4 is shielded with the cover material 6, so that during an earthquake, etc. Even if a large deformation occurs in the structure, lead will not be exposed to the outside surface. Therefore, stable damping performance can be ensured, and lead is not exposed to the atmosphere, so there is no risk of adverse effects on the environment.

Further, since the flange portion 38 formed on the plug 3 is fitted with the steel plate 4, the integrity of the plug 3 and the steel plate 4 is ensured, and a better damping effect can be expected. Further, due to the fixing action of the flange portion 38, the shape of the lead plug 31 can be maintained even when large shear deformation is repeatedly applied to the seismic isolation bearing for a long period of time. Therefore, durability against repeated action with large deformations is ensured.

In addition, since the laminated rubber 2 and the plug 3 are vulcanized and manufactured as one unit, the elastic coating 32 ensures adhesion to the laminated rubber 2 (rubber plate 21), so the lead plug 31 can be pressed evenly. can be restrained. Further, compared to the conventional manufacturing method in which the lead plug 31 is press-fitted after manufacturing the laminated rubber 2, stable damping performance can be obtained more efficiently.

<Third embodiment>
The laminated rubber bearing 1 of the third embodiment is a laminated rubber bearing containing a lead plug, which includes a laminated rubber 2, a plug 3, and a steel plate 4, as shown in FIG. In addition, since the details of the laminated rubber 2 of the laminated rubber bearing 1 of the third embodiment are the same as the laminated rubber 2 of the first embodiment, detailed explanation will be omitted.

The plug 3 is embedded in the center of the laminated rubber 2. The plug 3 passes through a through hole 23 in a rubber plate 21 and a metal plate 22 that constitute the laminated rubber 2. The total length of the plug 3 is larger than the height of the laminated rubber 2 and smaller than the height of the entire laminated rubber support 1 (the length from the upper surface of the upper steel plate 41 to the lower surface of the lower steel plate 42). Therefore, the upper and lower ends of the plug 3 protrude from the upper and lower surfaces of the laminated rubber 2 .
Other details of the plug 3 are the same as those of the plug 3 of the first embodiment, so a detailed explanation will be omitted.

Steel plate 4 (upper steel plate 41 and lower steel plate 42) covers the upper or lower surface of laminated rubber 2. A recess 44 for accommodating the end of the plug 3 is formed in the upper steel plate 41 and the lower steel plate 42 . The recess 44 is formed in the same shape as the protruding portion of the plug 3 from the laminated rubber 2.

Next, a method for manufacturing the laminated rubber bearing 1 of the third embodiment will be described. The method for manufacturing the laminated rubber bearing 1 includes a plug installation process, a lamination process, and a molding process.
The plug installation step is a step of installing an elastic covering material 32 on the outer surface of the cylindrical lead plug 31 and installing it on the mold 5.

In this embodiment, a side surface plate material 33 made of natural rubber is wrapped around the outer peripheral surface of the lead plug 31, and end surface plates 34 made of natural rubber are attached to the upper and lower surfaces of the lead plug 31.
In the plug installation process, first, as shown in FIG. 9(a), the lower steel plate 42 is placed on the mold 5. Next, the plug 3 is placed on the lower steel plate 42. At this time, the lower end of the plug 3 is inserted into the recess 44 of the lower steel plate 42.

The lamination process is a process of laminating a plurality of rubber plates 21 and a plurality of metal plates 22, as shown in FIG. 9(b). The rubber plates 21 and the metal plates 22 are alternately laminated with the lead plugs 31 having the side plate material 33 arranged around them inserted into the through holes 23 and 24. After a predetermined number of rubber plates 21 and metal plates 22 are laminated, the upper steel plate 41 is placed on the upper surface of the laminated rubber 2, as shown in FIG. 9(c). At this time, the upper part of the plug 3 is inserted into the recess 44 of the upper steel plate 41. Subsequently, the mold 5 is placed on the upper surface of the upper steel plate 41.

In the forming process, the rubber plate 21, metal plate 22, lead plug 31, elastic covering material 32, and steel plate 4 are vulcanized and formed. Vulcanization molding is performed by compressing a mold 5 installed in a press machine (not shown) from above and below and heating it. By vulcanization molding, the laminated rubber 2 and the plug 3 are integrally molded. In addition, in the forming process, the lead plug 31 may be fixed by a fixing pin 51 (see FIGS. 4 and 5) fixed to the steel plate 4.
After vulcanization molding, the mold is removed. When the fixing pin 51 is used in the molding process, the fixing pin 51 may be left in place.

As described above, according to the laminated rubber bearing 1 of the third embodiment, the lead plug 31 is covered with the elastic covering material 32, so even if large deformation occurs during an earthquake, the lead is exposed to the outer surface. There's nothing to do. Therefore, stable damping performance can be ensured, and lead is not exposed to the atmosphere, so there is no risk of adverse effects on the environment.

Further, since the flange portion 38 formed on the plug 3 is fitted with the steel plate 4, the integrity of the plug 3 and the steel plate 4 is ensured, and a better damping effect can be expected.
In addition, since the laminated rubber 2 and the plug 3 are vulcanized and manufactured as one unit, the elastic coating 32 ensures adhesion to the laminated rubber 2 (rubber plate 21), so the lead plug 31 can be pressed evenly. Can be restrained. Further, compared to the conventional manufacturing method in which the lead plug 31 is press-fitted after manufacturing the laminated rubber 2, stable damping performance can be obtained more efficiently.

The embodiments according to the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and each component can be modified as appropriate without departing from the spirit of the present invention.
For example, in the above embodiment, the case where the lead plug-containing laminated rubber bearing 1 is used for a bridge has been described, but the installation location of the lead plug-containing laminated rubber bearing 1 is not limited to bridges, and can be applied to any structure. It is possible.

Furthermore, in the embodiment described above, a case has been described in which the ends of the plug 3 protrude from the upper and lower surfaces of the rubber layer 2, but the ends of the plug 3 do not need to protrude from the rubber layer 2.
Furthermore, during vulcanization molding, the steel plate 4 may be fixed to the mold 5.

In the above embodiment, the plug 3 with the same volume as the completed shape (design value) is installed in the plug installation process, but the volume (height) of the plug 3 before vulcanization molding is different from the completed shape (vulcanization value) of the plug 3. It may be larger than the volume (height) of the plug 3) after sulfur molding. In the plug installation step, if a plug 3 whose height is larger than the completed shape is installed and compressed (shrinked) by vulcanization molding, the binding force of the plug 3 will be higher.

1 Laminated rubber bearing (laminated rubber bearing with lead plug)
2 Laminated rubber 21 Rubber plate 22 Metal plate 3 Plug 31 Lead plug 32 Elastic covering material 4 Steel plate 41 Upper steel plate 42 Lower steel plate 5 Mold 6 Lid material

Claims (4)

Lamination in which a plurality of rubber plates and metal plates with through holes formed at predetermined positions are alternately laminated with lead plugs whose outer peripheral surfaces, upper surfaces, and lower surfaces are covered with an elastic coating material inserted into the through holes. process and
A method for manufacturing a laminated rubber bearing containing a lead plug, comprising the step of vulcanizing and molding the rubber plate, the metal plate, and the lead plug. a plug installation step of arranging a lead plug whose outer peripheral surface, upper surface and lower surface are covered with an elastic coating material on the upper surface of the lower mold;
a laminating step of forming a laminated rubber on the upper surface of the lower mold;
A method for manufacturing a laminated rubber bearing containing a lead plug, comprising a molding step of vulcanizing and molding the laminated rubber and the lead plug,
In the plug installation step, a fixing pin fixed to the lower mold is inserted into a recess formed on the lower surface of the lead plug,
In the lamination step,
placing a lower steel plate with a through hole formed at a predetermined position on the lower mold with the lead plug inserted into the through hole;
Alternately stacking a plurality of rubber plates and metal plates with through holes formed at predetermined positions on the lower steel plate with the lead plugs inserted into the through holes;
placing an upper steel plate with a through hole formed at a predetermined position on the upper surface of the laminate of the rubber plate and the metal plate with the lead plug inserted into the through hole;
placing an upper mold on the upper surface of the upper steel plate, and inserting a fixing pin fixed to the upper mold into a recess formed on the upper surface of the lead plug;
In the molding step, vulcanization molding is performed with the lead plug being prevented from slipping with respect to the lower mold and the upper mold by the upper and lower fixing pins. Production method. a plug installation step of arranging a lead plug whose outer peripheral surface, upper surface and lower surface are covered with an elastic coating material on the upper surface of the lower steel plate;
a laminating step of forming a laminated rubber on the upper surface of the lower steel plate;
A method for manufacturing a laminated rubber bearing containing a lead plug, comprising a molding step of vulcanizing and molding the laminated rubber and the lead plug,
In the plug installation step, a fixing pin fixed to the lower steel plate is inserted into a recess formed on the lower surface of the lead plug,
In the lamination step,
Alternately stacking a plurality of rubber plates and metal plates with through holes formed at predetermined positions on the lower steel plate with the lead plugs inserted into the through holes;
placing an upper steel plate on the upper surface of the laminate of the rubber plate and the metal plate, and inserting a fixing pin fixed to the upper steel plate into a recess formed on the upper surface of the lead plug. ,
A method for manufacturing a laminated rubber bearing containing a lead plug, characterized in that in the forming step, vulcanization is performed in a state in which the lead plug is prevented from slipping with respect to the lower steel plate and the upper steel plate by the upper and lower fixing pins. . The method for manufacturing a laminated rubber bearing containing a lead plug according to any one of claims 1 to 3 , wherein the volume of the lead plug is reduced in the molding step.

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