JP6776598B2 - Side cover for rubber bearings and how to protect the rubber bearings - Google Patents

Description

The present invention relates to a side cover for a rubber bearing and a method for protecting the rubber bearing. More specifically, the side cover and the rubber bearing for a rubber bearing which can prevent the occurrence of ozone cracks in the rubber bearing and facilitate the mounting work. It is about the protection method of.

Rubber bearings are used to support structures such as buildings and bridges. There are various types of rubber bearings, but in general, it has a laminated body composed of a reinforcing plate and rubber laminated vertically, and the side surface of the laminated body is in a state where the rubber is exposed. ing. In rubber bearings used in bridges and the like, ozone cracks may occur on the side surfaces of the laminated body over time.

When the ozone crack grows to a certain size, the durability of the rubber bearing is affected, so repair is required. In this repair, for example, after burying a coating material in ozone cracks, vulcanization adhesion is performed. As described above, the conventional repair requires troublesome work at the site where the rubber bearing is installed, and the finish varies depending on the skill of the worker, so there is room for improvement.

A structure for preventing ozone cracks in the rubber bearing has also been proposed (see Patent Document 1). Patent Document 1 proposes a structure in which a side surface of a laminate is covered with a cover layer, and a special composition is sealed between the side surface of the laminate and the cover layer. In this structure, when the ozone crack grows until it penetrates the cover layer, the enclosed special composition flows out into the ozone crack and closes the ozone crack.

However, the work of encapsulating a special composition between the side surface of the laminate and the cover layer is very complicated, and a high skill is required for the operator. Therefore, this structure is premised on being constructed at a manufacturing plant or the like, not at the installation site of the rubber bearing.

Japanese Unexamined Patent Publication No. 2012-57691

An object of the present invention is to provide a side cover for a rubber bearing and a method for protecting the rubber bearing, which can prevent the occurrence of ozone cracks in the rubber bearing and facilitate the mounting work.

In order to achieve the above object, the side cover for a rubber bearing of the present invention is a side cover for a rubber bearing that covers the side surface of a rubber bearing having a laminated body in which a steel plate and a rubber layer are vertically laminated, and is stretchable. The strip-shaped member provided with a deformable strip-shaped member and a fixing portion provided at an end portion in the longitudinal direction of the strip-shaped member, and the strip-shaped member wound around the side surface of the laminated body is maintained in a tubular shape by the fixing portion. The inner peripheral surface of the strip-shaped member and the side surface of the laminated body facing the inner peripheral surface are brought into close contact with each other at the upper end portion and the lower end portion in the tubular axial direction of the strip-shaped member. It is characterized in that the structure is such that air is interposed and non-adhesive except for the upper end and the lower end in the tubular axis direction .
Further, another side cover for a rubber support of the present invention is a side cover for a rubber support that covers the side surface of a rubber support having a laminated body in which a steel plate and a rubber layer are vertically laminated, and can be expanded and contracted. The strip-shaped member is provided with a strip-shaped member and a fixing portion provided at the longitudinal end portion of the strip-shaped member, and the strip-shaped member wound around the side surface of the laminated body is maintained in a tubular shape by the fixing portion. It is characterized in that both ends in the longitudinal direction of the strip-shaped member maintained in a tubular shape are inclined and extend in the same direction with respect to the tubular axis direction.

In the method for protecting the rubber bearing body of the present invention, the strip-shaped member of the side cover for the rubber bearing body is wound around the side surface of the laminated body of the rubber bearing body already installed between the bridge girder and the pier, and then. The strip-shaped member is maintained in a tubular shape by the fixing portion to cover the side surface of the laminated body.

According to the present invention, the side surface of the laminated body can be covered with the strip-shaped member by winding the strip-shaped member around the side surface of the laminated body and then maintaining the strip-shaped member in a tubular shape by a fixing portion. Therefore, the side cover for the rubber bearing can be attached without requiring complicated work. Since the side surface of the laminate is covered and protected by this side cover, it is possible to prevent the occurrence of ozone cracks.

It is explanatory drawing which illustrates in the state which the side cover for rubber bearings of this invention is unfolded. It is explanatory drawing which illustrates the side cover of FIG. 1 attached to the rubber bearing body. FIG. 2 is a sectional view taken along the line AA of FIG. It is explanatory drawing which illustrates the close contact state between the side surface of a laminated body and the inner peripheral surface of a side cover. It is explanatory drawing which illustrates another embodiment of the side cover attached to a rubber bearing. It is explanatory drawing which illustrates still another embodiment of the side cover attached to a rubber bearing.

Hereinafter, the side cover for the rubber bearing and the method for protecting the rubber bearing of the present invention will be described based on the embodiment shown in the figure.

The side cover 1 for a rubber bearing (hereinafter referred to as a side cover 1) of the present invention illustrated in FIGS. 1 to 3 is attached so as to cover the side surface of the laminated body 5 constituting the rubber bearing 4. The side cover 1 includes a strip-shaped member 2 that can be expanded and contracted, and a fixing portion 3 (3a, 3b) provided at an end portion of the strip-shaped member 2 in the longitudinal direction.

The rubber bearing 4 includes a metal upper shoe 8 and a lower shoe 9, and a laminated body 5 integrated between them by vulcanization adhesion. The upper shoe 8 and the lower shoe 9 are fixed to an upper structure such as a bridge girder 10 and a lower structure such as a pier 11 and bolts, respectively. In this embodiment, the laminated body 5 has a square columnar shape, but other shapes such as a columnar shape can also be adopted.

In the laminated body 5, the steel plate 6 and the rubber layer 7 are alternately laminated and integrated by vulcanization adhesion. The upper shoe 8 is vulcanized and adhered to the rubber layer 7 on the uppermost surface of the laminated body 5 and fixed to the upper end surface of the laminated body 5. The lower shoe 8 is vulcanized and adhered to the rubber layer 7 on the lowermost surface of the laminated body 5 and fixed to the lower end surface of the laminated body 5.

The strip-shaped member 2 is formed of, for example, vulcanized rubber or soft resin, or these as a main material, and has excellent elasticity in the longitudinal direction and the width direction thereof. By adopting a stretchable and deformable material for a part of the strip-shaped member 2, it is possible to secure excellent stretchability in the longitudinal direction and the width direction of the strip-shaped member 2 as a whole. Here, the excellent elasticity means that the rubber bearing 4 (laminated body 5) has the ability to expand and contract without hindering the deformation and movement.

A material having excellent ozone crack resistance may be used for the strip-shaped member 2. For example, ethylene propylene rubber (EPM, EPDM), chloroprene rubber, urethane rubber, silicon rubber and the like are used.

The thickness of the strip-shaped member 2 is, for example, 5 mm or more and 15 mm or less, and is set to about 10 mm. If this thickness is less than 5 mm, the effect of preventing ozone cracks becomes too small, or the effective period becomes short. On the other hand, if the thickness exceeds 15 mm, the weight becomes excessive, the mountability deteriorates, and the cost becomes excessive. This thickness is substantially constant over the entire range of the strip-shaped member 2, but the thickness of a predetermined portion may be different from that of other portions.

As the fixing portion 3, various materials and structures can be adopted as long as the strip-shaped member 2 wound around the side surface of the laminated body 5 can be maintained in a tubular shape. Examples of the material constituting the fixing portion 3 include metals, resins, and vulcanized rubber. The fixing portions 3 may be provided at both ends in the longitudinal direction of the strip-shaped member 2, or may be provided only at one end.

In this embodiment, fixing portions 3a and 3b are provided at both ends in the longitudinal direction of the strip-shaped member 2, and the fixing portions 3a and 3b are engaged with each other. The protruding one fixed portion 3a is inserted into the other annular fixed portion 3b to engage with each other, and the inserted fixed portion 3a is removed to release the engagement. By engaging the fixing portions 3a and 3b with each other, the strip-shaped member 2 is maintained in a tubular shape. A hole may be provided at one end of the strip-shaped member 2 in the longitudinal direction, and a protruding fixing portion 3a may be provided at the other end. In this case, the fixing portions 3a are inserted into the holes to engage with each other, and the inserted fixing portions 3a are removed from the holes to release the engagement.

The strip-shaped member 2 may be formed into a plurality of divided bodies, and the divided bodies may be connected to each other to form a structure. The fixing portion 3 can also be used for connecting the divided bodies.

Hereinafter, a method of attaching the side cover 1 to the laminated body 5 to protect the rubber bearing 4 will be described.

The side cover 1 of the present invention can be attached to a rubber bearing 4 that has already been installed in various places, or a rubber bearing 4 that will be installed in the future. In this embodiment, a case where the side cover 1 is attached to the rubber bearing 4 already installed between the bridge girder 10 and the pier 11 will be described as an example.

First, the strip-shaped member 2 in the state illustrated in FIG. 1, which is not formed in a tubular shape before the longitudinal end portions are fixed to each other by the fixing portion 3, is conveyed to the mounting site. At the mounting site, the strip-shaped member 2 is wound around the side surface of the laminated body 5.

Next, the fixing portion 3 is used to fix one end of the strip-shaped member 2 in the longitudinal direction to the other end. As a result, as illustrated in FIGS. 2 and 3, the strip-shaped member 2 is maintained in a tubular shape, and substantially the entire range of the side surface of the laminated body 5 is covered by the side cover 1. One end and the other end of the strip-shaped member 2 in the longitudinal direction can be made into a tubular shape by abutting each other, or the strip-shaped member 2 can be made into a tubular shape by overlapping each other in the circumferential direction. Can also be.

The laminated body 5 is shear-deformed due to thermal deformation, vibration, or the like of the bridge girder 10, but since the strip-shaped member 2 can be expanded and contracted, it is deformed to follow this shear deformation. Therefore, the side cover 1 does not hinder the shear deformation (deformation movement) of the laminated body 5. Therefore, attaching the side cover 1 does not adversely affect the original performance of the rubber bearing 1.

Since the side surface of the laminate 5 is covered and protected by the side cover 1, it is possible to prevent the occurrence of ozone cracks. The rubber bearing 4 that has already been installed or is installed between the bridge girder 10 and the pier 11 is particularly prone to ozone cracks on the side surface of the laminated body 5, so it is very difficult to apply the present invention. It is beneficial to.

The attachment work of the side cover 1 is an easy operation in which the strip-shaped member 2 is wound around the side surface of the laminated body 5 and then maintained in a tubular shape by the fixing portion 3. Since complicated work is not required, there is no big difference in the finished state due to the difference in skill of the installation worker, which is advantageous for ensuring stable work quality. Moreover, the side cover 1 can also be attached to the rubber bearing 4 already installed between the bridge girder 10 and the pier 11.

Depending on the installation environment of the rubber bearing body 4, ozone cracks may or may easily occur only in a specific range of the laminated body 5. When such a situation exists, only the necessary range of the laminated body 5 can be covered with the side cover 1.

If it becomes difficult to continue using the side cover 1 attached to the rubber bearing 4, replace it. For example, when ozone cracks or other scratches occur on the strip-shaped member 2, or when the fixing portion 3 is damaged, the side cover 1 is removed from the rubber bearing 4 and a new side cover 1 is attached.

The inner peripheral surface of the strip-shaped member 2 maintained in a tubular shape and the side surface of the laminated body 5 facing the inner peripheral surface can be brought into close contact with each other in the entire range. As a result, the side surface of the laminated body 5 is in a state of being shielded from the outside air, which is more advantageous for preventing the occurrence of ozone cracks. An adhesive may be interposed between the inner peripheral surface of the strip-shaped member 2 and the side surface of the laminated body 5 to join the two, but if the two are brought into close contact with each other without the adhesive, the side cover The work of removing 1 from the rubber bearing 4 becomes easy.

In this embodiment, as illustrated in FIG. 4, the inner peripheral surface of the strip-shaped member 2 maintained in a tubular shape and the side surface of the laminated body 5 facing the inner peripheral surface are the upper ends of the strip-shaped member 2 in the tubular axial direction. It is in close contact with the lower end and the lower end. On the other hand, the inner peripheral surface of the strip-shaped member 2 and the side surface of the laminated body 5 are not in close contact with each other due to the presence of air other than the upper end portion and the lower end portion in the tubular axis direction of the strip-shaped member 2. Even with this structure, the side surface of the laminated body 5 is in a state of being shielded from the outside air, which is more advantageous for preventing the occurrence of ozone cracks.

In order to obtain the structure shown in FIG. 4, for example, an adhesive is interposed only between the upper and lower ends of the inner peripheral surface of the strip-shaped member 2 in the tubular axis direction and the side surface of the laminated body 5 to bring them into close contact with each other. Let the other parts be non-adhesive. Alternatively, the winding force of the strip-shaped member 2 wound around the side surface of the laminated body 5 is made stronger at the upper end portion and the lower end portion of the strip-shaped member 2 in the tubular axial direction than at other portions. This winding force can be changed by adjusting the fixing portion 3.

As the fixing portion 3, a fastener type can also be used as in the embodiment illustrated in FIG. The strip-shaped member 2 can be easily maintained in a tubular shape by providing a large number of fastener pieces that can be disconnected from each other at both ends in the longitudinal direction of the strip-shaped member 2 and connecting the opposing fastener pieces to each other.

In the above-described embodiment, one end and the other end of the tubular strip member 2 in the longitudinal direction extend in the axial direction, respectively. In the embodiment illustrated in FIG. 6, one end and the other end of the strip-shaped member 2 in the longitudinal direction are inclined and extend in the same direction with respect to the tubular axis direction, respectively. That is, both ends of the strip-shaped member 2 in the longitudinal direction extend diagonally with respect to the vertical direction, and are parallel to each other.

When the laminated body 5 is shear-deformed, the strip-shaped member 2 is deformed so as to follow the deformation. Therefore, if both ends of the strip-shaped member 2 in the longitudinal direction are inclined in the same direction with respect to the tubular axis direction as in this embodiment, when the laminated body 5 is sheared and deformed, both ends of the strip-shaped member 2 in the longitudinal direction are separated from each other. , Behaves as if it shifts in the direction of inclination. Therefore, even if the laminated body 5 is sheared and deformed, it becomes difficult for a gap to be formed between both ends of the strip-shaped member 2 in the longitudinal direction, which is advantageous in preventing ozone cracks on the side surface of the laminated body 5.

The fixing portion 3 may be set to cancel the function of maintaining the strip-shaped member 2 in a tubular shape when the shear deformation amount of the laminated body 5 exceeds a preset reference value. For example, the structure is such that the fixing portion 3 is damaged when the value exceeds this reference value, or the engaging fixing portion 3 is disengaged. As a result, in the event of a large-scale earthquake or the like, the side cover 1 is separated from the rubber bearing 4, or the side cover 1 can be easily removed, so that the condition of the rubber bearing 4 can be easily inspected.

The present invention can be used not only for the purpose of repairing the existing rubber bearing 4 but also for the purpose of applying it to a new rubber bearing 4 to prevent ozone cracks in the laminated body 5.

1 Side cover 2 Band-shaped member 3, 3a, 3b Fixed part 4 Rubber bearing 5 Laminated body 6 Steel plate 7 Rubber layer 8 Upper shoe 9 Lower shoe 10 Bridge girder 11 Pier

Claims (6)

A side cover for a rubber bearing that covers the side surface of a rubber bearing having a laminated body in which a steel plate and a rubber layer are laminated one above the other.
The strip-shaped member provided with a stretchable and deformable strip-shaped member and a fixing portion provided at an end portion in the longitudinal direction of the strip-shaped member, and the strip-shaped member wound around the side surface of the laminated body is formed into a tubular shape by the fixing portion. The inner peripheral surface of the strip-shaped member maintained and maintained in a tubular shape and the side surface of the laminated body facing the inner peripheral surface are in close contact with each other at the upper end portion and the lower end portion in the tubular axial direction of the strip-shaped member. A side cover for a rubber bearing, which is characterized in that air is interposed and non-adhesive except for the upper end and the lower end in the axial direction . A side cover for a rubber bearing that covers the side surface of a rubber bearing having a laminated body in which a steel plate and a rubber layer are laminated one above the other.
A strip-shaped member that can be expanded and contracted and a fixing portion provided at an end portion in the longitudinal direction of the strip-shaped member are provided, and the strip-shaped member wound around the side surface of the laminated body is formed into a tubular shape by the fixing portion. A side cover for a rubber bearing, characterized in that both ends of the strip-shaped member maintained in a tubular shape are inclined in the same direction with respect to the tubular axis direction and extend . The side cover for a rubber bearing according to claim 2 , wherein the inner peripheral surface of the strip-shaped member maintained in a tubular shape and the side surface of the laminated body facing the inner peripheral surface are in close contact with each other in the entire range. The invention according to any one of claims 1 to 3, wherein the function of maintaining the strip-shaped member in a tubular shape by the fixing portion is canceled when the shear deformation amount of the laminated body exceeds a preset reference value. Side cover for rubber bearings. The side cover for a rubber bearing according to any one of claims 1 to 4, wherein the strip-shaped member has a thickness of 5 mm or more and 15 mm or less. The strip-shaped member of the side cover for the rubber bearing according to any one of claims 1 to 5 is wound around the side surface of the laminated body of the rubber bearing already installed between the bridge girder and the pier, and then this A method for protecting a rubber bearing, which comprises covering the side surface of the laminated body by maintaining the strip-shaped member in a tubular shape by the fixing portion.

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