JP2006219880A - Bearing structure for building base isolation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To contemplate high efficiency of inspection work in a bearing structure equipped with a cover member used for a construction of vibration isolation of a building such as a dwelling or the like. <P>SOLUTION: The bearing structure 1 is equipped with a bearing body 5 capable of rolling a rolling surface 4a by making interior finishing of a spherical rolling material 5a in a rotatable manner, and it is equipped with a cover steel plate 6 divided into the first divided member 61 and the second divided member 62 so as to cover the rolling surface 4a to hold the outer circumference 5b of the bearing body 5. The first divided member 61 and the second divided member 62 are connected with bolt 9a and nut 9b from the opposite side of the rolling surface 4a of the cover steel plate 6 by making a sealing member 10 intervene in an alignment face. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a base isolation structure for a building used for a base isolation structure of a building such as a house.

Conventionally, seismic isolation structures constructed in buildings such as houses are generally installed on the foundations of buildings where dust is extremely generated. If this dust adheres to the sliding surface of the bearing structure (rolling bearing structure or sliding bearing structure, the same applies hereinafter), the function of the bearing structure will deteriorate, so a dustproof cover that protects the sliding surface may be installed. is needed. In order to maintain this seismic isolation function, it is common to periodically inspect the sliding surface and the bearing structure.
Here, as a function of the dust-proof cover, for example, there is a support structure in which a single cover member covering the upper side of the sliding range is provided on the support body in order to prevent dust on the sliding surface. The cover member is attached from below by a fixing member such as a screw or a retaining ring so as to surround the support body. The space between the cover member and the sliding surface is provided with an elastic body that secures a dust-proof range of the sliding surface and forms a peripheral wall surrounding the dust-proof range, and forms a dust-proof region sealed from the outside. Has been.
In the inspection work of the support structure provided with the cover member, after the cover member is removed, the adhesion state of dust on the sliding surface, the support body, and the lower surface of the cover member is visually confirmed. Furthermore, when inspecting the sliding surface without removing the cover member, move the cover member and the support body in one direction to inspect the range of the sliding surface that can be visually inspected. Check by moving the cover member and the support body in the opposite direction.
Further, as dust covers other than those described above, for example, Patent Document 1 and Patent Document 2 are proposed.
In Patent Document 1 and Patent Document 2, a dust-proof cover that is formed in a box shape with the opening side facing the sliding surface is provided on the support body. Since this dustproof cover is formed of a lightweight member and is divided, it has a structure that can be easily removed. Furthermore, in patent document 1, it has the structure by which the division | segmentation or joining of the dust-proof covers divided | segmented is easy by providing a stopper in the upper part of a dust-proof cover.
JP 2004-76472 A JP-A-11-236942

However, in the support structure including the dust-proof cover member described above, the position of the fixing member that forms the cover member mounting portion is within the sealed dust-proof region. The entire support body to which the member is attached is removed. At this time, it is necessary to perform a temporary support with the support material around the support body, and the removal work is not easy. For this reason, for example, when the inspection work is performed with a small seismic isolation layer such as a house, workability is poor and it takes time and effort, and there is a problem in safety.
Further, in the method of moving and inspecting the support body and the cover member without removing the cover member, a large-scale moving means and labor for forcibly moving the building including the building frame are required.
On the other hand, in Patent Document 1 and Patent Document 2 described above, since the dust-proof cover and the sliding surface are not fixed and the dust-proof cover is formed of a lightweight member, a gap is generated. There is a problem that dust enters the dust cover.

  The present invention has been made in view of the above-described problems, and in a bearing structure provided with a cover member used for a seismic isolation structure for a building such as a house, the building seismic isolation designed to improve the efficiency of inspection work. The purpose is to provide a bearing structure.

In order to achieve the above object, in the building seismic isolation bearing structure according to the present invention, a bearing body that is provided with a rolling material or a sliding material so that the sliding surface is slidable, covers the sliding surface, and the bearing body A cover member divided into at least two or more divided members so as to sandwich the member, and a fixing member is provided on the joint surface between the divided members so as to be joined on the opposite side of the sliding surface of the cover member It is characterized by being.
In the present invention, in the support structure provided with the dustproof cover member, the cover member is divided into at least two or more, and the fixing member for joining these divided members is the side opposite to the sliding surface The cover member can be easily removed at the time of inspection, for example. And the adhesion state of the dust in the sliding surface in a dust-proof area | region and a rolling material (sliding material) can be confirmed, and the state of the lower surface side of the removed cover member can also be confirmed.
As described above, since the fixing member for attaching the cover member to the support body is not in the narrow gap between the cover member and the sliding surface, it is not necessary to remove the support body from the housing during inspection as in the prior art. . Therefore, the efficiency of the inspection work can be improved even in a place where the seismic isolation structure is installed in a narrow place such as a house.

Further, in the building seismic isolation structure according to the present invention, it is preferable that the support body is provided with a support portion so that the attached cover member does not shift to the sliding surface side.
In the present invention, by providing a support portion such as a retaining ring on the sliding surface side of the cover member attached to the support body, the cover member can be prevented from shifting to the sliding surface side by its own weight.

Moreover, in the building seismic isolation support structure according to the present invention, the cover member is preferably provided with a seal member on the joint surface of the split member.
In the present invention, since the sealing member is interposed on the connection surface of each split member and joined by the fixing member, the dustproof effect of the joint surface of the cover member can be improved.

According to the building seismic isolation support structure of the present invention, in the support structure including the dustproof cover member, the cover member is divided into at least two or more, and the fixing member for joining these divided members is slid. Since it is provided on the side opposite to the moving surface, the cover member can be easily removed at the time of inspection, for example. And the adhesion state of the dust in the sliding surface in a dust-proof area | region and a rolling material (sliding material) can be confirmed, and the state of the lower surface side of the removed cover member can also be confirmed.
Since the fixing member for attaching the cover member to the support body is not in the narrow gap between the cover member and the sliding surface, there is no need to remove the support body from the housing at the time of inspection as in the past. Even if the installation location of the seismic isolation structure is narrow, the inspection work can be made more efficient and the work safety can be improved.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4.
1 is a side view showing a building isolation structure according to an embodiment, FIG. 2 is an enlarged view of the bearing structure shown in FIG. 1, FIG. 3 (a) is an exploded plan view of the cover steel plate shown in FIG. (B) is an exploded side view of the cover steel plate shown in FIG. 3 (a), and FIG. 4 is a view showing a support structure according to a modification.

As shown in FIG. 1, the support structure 1 according to the present embodiment is used for a seismic isolation structure of a building such as a house, for example, and is fixed to a lower portion 2 a of a building housing 2. The upper surface 3a of the foundation 3 is provided with a rolling steel plate 4 that forms a flat rolling surface 4a (sliding surface).
The bearing structure 1 includes a bearing body 5 in which a spherical rolling member 5a is rotatably provided and a rolling surface 4a is provided so as to be capable of rolling, and a rolling body 4a is provided so as to cover the rolling surface 4a of the rolling steel plate 4. And a cover steel plate 6 (cover member) attached to surround the lower outer periphery 5b.

And as shown in FIG. 1, the elastic body which makes the surrounding wall which secures the dust-proof area | region R in the predetermined space which needs dust-proof between the rolling steel plate 4 and the cover steel plate 6, and surrounds the side surface of the dust-proof area R 7 is provided.
The elastic body 7 has a lower end 7 a fixed to the rolling surface 4 a of the rolling steel plate 4. Since the cover steel plate 6 comes into contact with the upper end 7b of the elastic body 7, the cover steel plate 6 and the elastic body 7 come into close contact with each other without any gap, and the inside of the dust-proof region R is blocked from the outside to be dust-proof.
The elastic body 7 is preferably provided to secure the dust-proof region R, but the material, shape, and the like are not limited to the elastic body 7.

As shown in FIG. 2, a reduced diameter portion 5c having a diameter reduced from the main body peripheral portion 5f is formed below the support main body 5, and a step surface 5d is formed at the boundary between the main body peripheral portion 5f and the reduced diameter portion 5c. Is formed.
And the cover steel plate 6 is attached so that the upper end of the reduced diameter part 5c of the support main body 5 may be enclosed, and the upper surface 6a used as the approximate center of the cover steel plate 6 is contact | abutted and fixed to the level | step difference surface 5d.

  Further, as shown in FIG. 2, a groove 5e is formed at a position in contact with the lower end of the cover steel plate 6 on the outer periphery 5b of the reduced diameter portion 5c. The groove 5e is provided with a retaining ring 8 (support portion) having, for example, a C shape, and supports the cover steel plate 6 attached to the outer periphery 5b of the reduced diameter portion 5c from below. With such a configuration, the cover steel plate 6 can be fixed to the support body 5 without shifting to the rolling surface 4a side.

Next, as shown in FIG. 3, the cover steel plate 6 is divided into two so as to sandwich the reduced diameter portion 5 c of the support body 5 at the approximate center of the cover steel plate 6, and the first split member 61 and the second split member 62. And make up.
As shown in FIG. 3 (a), the joint portion between the first split member 61 and the second split member 62 includes semicircular joint portions 61a and 62a formed in a semicircular shape with the reduced diameter portion 5c interposed therebetween, and It is comprised from the junction parts 61b and 62b which join and fix both the division members 61 and 62 on both sides. And as shown in FIG.3 (b), the joining surfaces 61c and 62c which stand up above the cover steel plate 6 are formed in the junction parts 61b and 62b.

As shown in FIGS. 3A and 3B, through holes 61d and 62d are formed at predetermined intervals in the horizontal direction on the joint surfaces 61c and 62c. Then, with the joint surfaces 61c and 62c of both the split members 61 and 62 being aligned, the bolts 9a (fixing members) are inserted through the through holes 61d and 62d and screwed with the nuts 9b (fixing members). Is done.
In addition, a sealing member 10 having elasticity such as a rubber sheet is provided between the joint surfaces 61c and 62c. As a result, when the first divided member 61 and the second divided member 62 are joined, there is no gap between the joined surfaces 61c and 62c, and the dustproof property of the cover steel plate 6 is improved.

In the support structure 1 including the cover steel plate 6 according to the present embodiment described above, for example, in the case of inspection, the bolt 9a and the nut 9b that join the first divided member 61 and the second divided member 62 are provided with the cover steel plate 6. The cover steel plate 6 can be easily removed from the support body 5 by removing from the upper side. Thereby, while being able to confirm the adhesion state of dust etc. in the rolling surface 4a in the dust-proof area | region R and the rolling material 5a, the state of the lower surface 6b of the removed cover steel plate 6 can also be confirmed (refer FIG. 2).
Thus, since the cover steel plate 6 does not have a fixing member such as a bolt 9a and a nut 9b on the rolling surface 4a side of the cover steel plate 6 as in the prior art, there is no need to remove the support body 5 from the housing 2 at the time of inspection. It becomes. Therefore, safety can be improved by working in a space of a narrow seismic isolation layer such as a house, and the efficiency of inspection work can be improved.
Further, by providing the sealing member 10 on the joining surfaces 61c and 62c of the cover steel plate 6, the sealing performance of the dust-proof region R can be improved.

Next, a modified example of the embodiment will be described with reference to FIG. 4, but the same or similar members and parts as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted. A different configuration will be described.
As shown in FIG. 4, in the support main body 5 according to the present modification, a lower diameter portion 5g (support portion) whose diameter is larger than that of the main body peripheral portion 5f is formed.
The circular joints 61a and 62a of the cover steel plate 6 are formed in a semicircular shape having the same radial dimension as the main body peripheral portion 5f, and are placed above the enlarged diameter portion 5g to sandwich the main body peripheral portion 5f. And are fixed by bolts 9a and nuts 9b. Thereby, the cover steel plate 6 fixed to the support main body 5 is supported by the enlarged diameter portion 5g and is not shifted to the rolling surface 4a side (see FIG. 3).
In this modification, the same effect as the embodiment can be obtained, and the cover steel plate 6 can be easily removed without removing the support body 5 at the time of inspection or the like.

As mentioned above, although embodiment and the modification of the building seismic isolation structure by this invention were demonstrated, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning. .
For example, in the embodiment and the modified example, the rolling support body 5 is provided with the rolling material 5a. However, the rolling support body 5 is not necessarily limited to the rolling support body 5. Instead, the support body 5 may be provided with a sliding material that slides on the sliding surface.
Further, in the embodiment and the modification, the cover steel plate 6 is divided into two parts, but the number of divisions is not limited, and it is sufficient that the number is at least two parts.
Further, in the embodiment and the modified example, the connection between the first divided member 61 and the second divided member 62 of the cover steel plate 6 is a fixing member using a bolt 9a and a nut 9b. Any fixing member that can be divided or joined may be used. And the division | segmentation and joining operation | work of the 1st division member 61 and the 2nd division member 62 of the cover steel plate 6 should just be performed on the opposite side to the rolling surface 4a of the cover steel plate 6. FIG.

Moreover, in embodiment and the modification, in order to support the cover steel plate 6 attached to the support main body 5 from the downward direction, the retaining ring 8 or the enlarged diameter part 5g formed in the support main body 5 is provided. It is not limited to the support part. In short, it is only necessary that the attached cover steel plate 6 is fixed so as not to shift to the rolling surface 4a side.
Further, in the embodiment and the modification, the seal member 10 is sandwiched between the joint surfaces 61c and 62c of the first split member 61 and the second split member 62, but the seal member is inserted into one or both of the semicircular joint portions 61a and 62a. 10 may be attached to improve dust resistance. Note that the seal member 10 may not be provided.
Furthermore, in the embodiment and the modified example, the cover steel plate 6 and the rolling steel plate 4 are formed of steel plates, but are not necessarily limited to these members, and are, for example, members made of rubber or plastic. It doesn't matter.

It is a side view which shows the building isolation structure according to the embodiment of the present invention. It is an enlarged view of the support structure shown in FIG. FIG. 3A is an exploded plan view of the cover steel plate shown in FIG. 2, and FIG. 3B is an exploded side view of the cover steel plate shown in FIG. It is a figure which shows the support structure by a modification.

Explanation of symbols

1 Bearing structure 4 Rolling steel plate 4a Rolling surface (sliding surface)
5 Support body 6 Cover steel plate (cover member)
61 1st division member 62 2nd division member 61c, 62c Joining surface 7 Elastic body 8 Retaining ring (support part)
9a Bolt (fixing member)
9b Nut (fixing member)
10 Seal member R Dust-proof area

Claims (3)

A bearing body that is internally provided with a rolling material or sliding material and that has a sliding surface slidable;
A cover member that covers the sliding surface and is divided into at least two divided members so as to sandwich the support body;
With
The building seismic isolation structure according to claim 1, wherein a fixing member is provided on a joint surface between the divided members so that the cover member can be joined on the opposite side of the sliding surface of the cover member.   2. The building isolation structure according to claim 1, wherein the support body is provided with a support portion so that the attached cover member does not shift toward the sliding surface.   3. The building seismic isolation structure according to claim 1, wherein a seal member is provided on the joint surface of the split member in the cover member.

Images