JPH10306617A - Cover body of construction of base isolation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the adhesion of foreign matters, the incursion of rain water and the generation of rust in the rolling surface, the sliding surface, etc., of a base isolation bearing body having excellent dust proofing efficiency, waterproofing efficiency and dampproofing efficiency and, at the same time, to easily remove a cover body without taking time for dismantling the base isolation bearing body. SOLUTION: A base isolation body 8 provided between footing 2 and structure 4 and bearing the structure 4 in the horizontal direction in a movable manner on rolling bearing by a ball bearing such as steel ball, etc., is provided. A cover body 10 for covering the rolling surface in the vibration isolation bearing body 8 is provided, and the cover body 10 is constituted of a plurality of divided parts 101 , 102 and 103 capable of being detached from the base isolation bearing body 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a cover having a seismic isolation structure.

[0002]

2. Description of the Related Art As a seismic isolation structure for a structure such as a building, a seismic isolation support by a rolling or sliding bearing is interposed between a foundation and a structure, and the structure is horizontally moved by the seismic isolation support. Conventionally, there has been known one that is movably supported. As this type of seismic isolation support, rolling bearings using ball bearings or free bearings, and combinations of orthogonal rollers and rails are known.On the other hand, sliding bearings made of a material with a small coefficient of friction are known. The thing using a body etc. is known.

[0003]

In the above conventional seismic isolation structure, since ball bearings and sliding bodies are exposed to the outside, rainwater or the like may invade rolling and sliding surfaces, etc. There is a possibility that foreign matter such as adheres to the rolling surface or the sliding surface. Further, there is a possibility that rust is generated on the rolling surface, the sliding surface, and the like due to dew condensation due to a temperature change.

In order to protect the seismic isolation bearing structure from rainwater, dust, etc., the applicant has already filed Japanese Patent Application No. 8-24.
No. 9655 proposes to cover the seismic isolation structure with a cover body (unknown). However, when the cover body is formed as an integral structure, especially when the cover body has a rigid structure, the maintainability of the seismic isolation support structure is improved. Is bad.

[0005] In other words, the seismic isolation bearing structure cannot be viewed silently while it is covered with the cover, and the state of internal deterioration cannot be determined. (It is conceivable that the cover is made transparent, but the cover has weather resistance. To be covered with a light-shielding protective cover, so that it is opaque as a whole). In addition, it is not possible to clean water, dust, and the like that have entered the seismic isolation bearing structure due to the obstruction of the cover body. Also, if the cover cannot be removed, periodic checks will be almost impossible unless the structure is lifted and the seismic isolation bearing structure is dismantled.

The present invention has been made in view of the above-mentioned conventional problems, and has excellent dustproofness, waterproofness, and moistureproofness. It is an object of the present invention to provide a cover having a seismic isolation structure that can prevent attachment of foreign matter, intrusion of rainwater and the like, generation of rust, and the like, and that can be easily removed without having to disassemble the seismic isolation body.

[0007]

The present invention has the following configuration to achieve the above object. The invention according to claim 1 is a seismic isolation method for a structure having a seismic isolation support interposed between a foundation and a structure and supporting the structure in a horizontal direction by a rolling bearing or a sliding bearing. In the structure, a cover body covering a rolling surface or a sliding surface of the seismic isolation support is provided, and the cover body includes a plurality of portions that can be divided and attached and detached from the seismic isolation support. It is a cover with a seismic isolation structure.

According to a second aspect of the present invention, the cover body is formed of a rigid body, and only one of the cover bodies is fixed to the foundation side or the structure side, and the periphery of the other end is normally set to the other side. The cover body of the seismic isolation structure according to claim 1, wherein the cover body is slidably mounted on a peripheral edge of the rolling surface or the sliding surface on the side.

The invention according to claim 3 is the cover body of the seismic isolation structure according to claim 2, wherein the other end of the cover body is formed in a flange shape along the horizontal direction.

According to the first aspect of the present invention, since the seismic isolation support is provided with a cover that covers the rolling surface or the sliding surface, the seismic isolation support by the rolling or sliding bearing is sealed by the cover. It is possible to prevent foreign substances such as dust from adhering to the seismic isolation support, infiltration of rainwater and the like, and generation of rust due to condensation.

In addition, since the cover body can be attached and detached from the seismic isolation support, a plurality of divided parts can be independently attached, so that it is not necessary to remove the entire cover body during maintenance, and one or more cover bodies can be used. By removing the part, the inside of the seismic isolation support can be exposed. Therefore, by removing the cover part, it is possible to visually judge the internal deterioration status of the seismic isolation support, and
Water and dust inside the support can be cleaned. In addition, if it was an integral cover, it was necessary to lift the structure and disassemble the seismic isolation support, but because some can be removed,
The troublesome and expensive work of lifting a structure and dismantling a seismic isolation support is not required. In addition, when attaching the seismic isolation support, when the cover body is integral, it is necessary to attach the cover body to the seismic isolation support in advance, and the cover body tends to hinder the attachment of the seismic isolation support. If the cover body is divided as in the present invention, the cover body can be attached after the seismic isolation support is attached, so that it is not an obstacle.

According to the second aspect of the present invention, when the cover body is made of, for example, a rigid body which is relatively difficult to deform, only one of the cover bodies is fixed to the foundation side or the structure side,
Also, if the peripheral edge of the other end is slidably mounted on the peripheral edge of the rolling surface / sliding surface on the other side during normal times (when no earthquake occurs), at least in normal times, the rolling member is surely rolled by the cover body. The moving and sliding surfaces can be covered. Therefore, it is not necessary to consider the deformation of the cover body, and it is possible to prevent foreign matters such as dust and rainwater or the like from entering with a simple and inexpensive configuration.

In this case, if the other end of the cover body is formed in a flange shape as described in claim 3, foreign substances such as dust and rainwater can be made more difficult to enter. At the same time, even if the other end, which is not fixed, moves in the horizontal direction with respect to the periphery of the other rolling surface / sliding surface during an earthquake, these rolling surfaces and the like may interfere with the cover body. Can be prevented.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. First, the cover body 10 of the seismic isolation structure according to the first embodiment will be described with reference to FIGS. Figure 1
As shown in FIG. 3, the seismic isolation structure of the first embodiment
And a building (an example of a structure) 4 and a seismic isolation support 8 that supports the building 4 movably in the horizontal direction by a rolling bearing by a ball bearing 6 such as a steel ball. A cover 10 covering a rolling surface of the seismic isolation support 8, and the cover 10 is divided into a plurality of portions 10 ₁ , 10 ₂ that can be attached to and detached from the seismic isolation support 8. … Consisting of

The seismic isolation support 8 allows the ball bearing 6 to be rotatably held by the ball holder 12 provided on the bottom surface 4 a of the building 4, and the upper surface 1 of the lower support plate 14 fixed to the foundation 2.
4a for rolling the ball bearing 6;
The cover body 10 is made of a rigid body having relatively high rigidity.

The ball holder 12 is provided on the bottom 4a of the building 4.
12a, which is fixed to the housing 12 by fastening or the like, and a holding portion 12 which is formed to protrude downward from the flange 12a.
The holding portion 12b is formed with a substantially semi-spherical concave portion 12b1 which is open downward and holds the ball bearing 6 in a rotatable manner. The lower support plate 14 is formed to have a larger diameter than the holding portion 12b,
a is the bottom surface 4a of the building 4 as going outward from the center.
, And is formed by a substantially mortar-shaped slope approaching the slab. This upper surface 14a
Accordingly, the ball bearing 6 is positioned at the center of the lower support plate 14 in a normal state, and a restoring force (spring effect) for returning the ball bearing 6 to the center during an earthquake is obtained.

The cover body 10 is formed in a skirt shape which is open from the periphery of the lower end of the holding portion 12b to the periphery of the lower support plate 14 as a whole with the parts 10 ₁ , 10 ₂ . You. Upper end 10a of this cover body 10
Is appropriately fixed to the lower peripheral edge of the holding portion 12b with screws or the like, while the peripheral edge of the lower end portion 10b of the cover body 10 is slidably mounted without fixing to the peripheral edge of the upper surface 14a in normal times. You. The lower end 10b of the cover body 10
Is formed in a flange shape outwardly and horizontally along the periphery of the upper surface 14a and protrudes therefrom.

The cover body 10 includes a plurality of parts 1.
0 _1, 10 ₂ ... exhibit the skirt shape as a whole associated therewith is, each portion 10 _1, 10 ₂ ... are each of a plurality of screws independently 16, 16 by the ball holding member 12
Can be fastened to the outer peripheral surface of the holding portion 12b. Although the number of divisions of the cover body 10 can be selected according to conditions, it is preferable to divide the cover body 10 into two to four parts. The material of the cover body 10 is made of resin or metal.

According to the first embodiment, the cover 10
Is fixed to the building 4 side, and the periphery of the lower end 10b is normally positioned at the periphery of the lower support upper surface 14a.
Thus, the upper surface 14a and the concave portion 12b1 can be surely covered, and it is possible to prevent foreign matters such as dust and rainwater from entering with a simple and inexpensive configuration without considering deformation.

The cover body 10 is composed of a plurality of divided portions 10 ₁ , 10 _2, ..., And can be independently attached to and detached from the ball holder 12 of the seismic isolation support 8. Cover body 1
There is no need to remove the entire unit at once. That is, by removing one or more portions 10 ₁ , 10 _2, ... Of the cover body 10, the inside of the seismic isolation support 8 can be exposed. Also, to remove the entire cover body, a part 10
.. Can be completely removed from the seismic isolation support 8 by sequentially removing ₁ , ₂ ,.

Accordingly, by partially or entirely removing the cover body 10 divided into the respective parts in this manner,
The state of deterioration inside the seismic isolation support 8 can be visually judged, and water and dust inside the support 8 can be cleaned.

In the case of an integral cover, the structure must be lifted and the seismic isolation support 8 must be disassembled in order to remove the cover, but according to the cover 10 of the above embodiment, ., Without removing the seismic isolation support 8, each part 10 ₁ , 10 ₂ ... Can be sequentially removed to remove the entire cover body 10, so that the building 4 is lifted and the seismic isolation support 8 is disassembled. In addition, costly work is not required.

When the seismic isolation support 8 is attached, if the cover is integral, it is necessary to attach the cover to the seismic isolation support 8 in advance, and the cover is used to attach the seismic isolation support. It is easy to get in the way, but as in the previous embodiment,
Since the cover body 10 is divided into parts, portions 10 ₁ , 10 _2, ..., The cover body 10 can be attached after the seismic isolation support 8 is attached between the foundation 2 and the building 4. Does not hinder the installation of the seismic isolation support 8.

Further, since the lower end portion 10b of the cover 10 is formed in a flange shape facing outward, it is possible to make it more difficult for foreign substances such as dust and rainwater to enter. Further, even if the foundation 2 and the building 4 are relatively displaced in the horizontal direction during the earthquake and the cover body 10 moves together with the building 4, the lower end portion 10b of the cover 10 has a flange shape along the horizontal direction. So the lower end 1
Ob does not slide on the periphery of the upper surface 14a of the lower support plate 14 and does not interfere with the lower support plate 14.

In the event of an earthquake, the lower end 10 of the cover 10
b slides on the periphery of the upper surface 14a, the lower end 10
Although a gap is formed between the periphery of the upper surface 14a and the periphery of the upper surface 14a, the time during which the earthquake occurs is short (about 1 minute), and when the earthquake has subsided, the ball 6 is securely positioned at the center of the upper surface 14a. Return to the lower end 10 of the cover body 10.
Since b returns to the peripheral position of the upper surface 14a, there is a low possibility that foreign matter such as dust enters the upper surface 14a or the concave portion 14b1 during an earthquake.

Next, a second embodiment will be described with reference to FIGS. Note that the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIGS. 4 and 5, in the second embodiment, the seismic isolation support 18 includes the ball bearing 6 and a building 4 attached to the ball bearing 6.
A disk-shaped upper support plate 20 with which the side 20a is in contact, and a ball bearing 6 which is opposed to the upper support plate 20 and on the side of the foundation 2
And an upper support plate 20 and a lower support plate 14 having substantially the same shape as the upper support plate 20 in contact with the upper surface 14a having a substantially mortar shape. Each of the upper support plate 20 and the lower support plate 14 is appropriately fixed to the bottom surface 4a of the building 4 and the foundation 2 with anchor bolts or the like.
Note that the flat upper support plate 20 and the lower support plate 14 are formed with the same outer diameter in plan view.

The cover body 22 in the second embodiment
Has a cylindrical shape with a plurality of rigid parts 22 ₁ , 22 _2, ... Attached in combination, and the upper end 22 a thereof has screws 16, 1, 2 on the periphery of the upper support plate 20.
6, while the peripheral edge of the lower end portion 22b is slidably mounted on the peripheral edge of the upper surface 14a of the lower support plate 14 in normal times. A lower end portion 22b of the cover body 22 is formed in a flange shape outward and along the horizontal direction from the periphery of the upper surface 14a of the lower support plate and protrudes.

According to the second embodiment, as in the first embodiment, at least in the normal state, the lower support plate upper surface 14a and the upper support plate 20 lower surface 20a which are the rolling surfaces are provided.
Can be reliably covered by the cover body 22, and the interference between the lower support plate 14 and the cover body 22 can be prevented even if the foundation 2 and the building 4 are relatively displaced in the horizontal direction during an earthquake. it can. And for maintenance,
There is no need to remove the entire cover body 22, and the cover body 2
The interior of the seismic isolation support 8 can be exposed by removing one or more portions 22 ₁ , 22 ₂ .

Next, a third embodiment will be described. As shown in FIG. 6, the seismic isolation support 24 includes the ball bearing 6, a disk-shaped upper support plate 26 in which the lower surface 26 a contacts the ball bearing 6 on the building 4 side, and faces the upper support plate 26. And a lower support plate 28 having substantially the same shape as the upper support plate 26 in which the ball bearing 6 and the upper surface 26a are in contact with each other on the foundation 2 side, and which can be deformed in accordance with the relative displacement between the foundation 2 and the building 4. The seismic isolation support 24 is closed by a body 30. Upper support plate 24 and lower support plate 26
Each is appropriately fixed to the bottom surface 4a of the building 4 and the foundation 2 with anchor bolts or the like.

The cover body 30 is made of a highly flexible material, and has a substantially cylindrical shape in a state where a plurality of parts 30 ₁ , 30 ₂ ... Are attached in combination with each other. It can be attached and separated. The upper edge and the lower edge of each part of the cover body 30 are
Each is fixed to the outer peripheral portion of the upper support plate 26 and the lower support plate 28 by a fixing means having a high sealing property, whereby the space around the ball bearing 6 is sealed.

The material of the cover 30 is as follows.
For example, a transparent synthetic resin of polyolefin such as EVA (ethylene-vinyl acetate copolymer) or an elastic body such as EP (ethylene propylene) rubber can be used. When the cover body 30 is transparent, it is desirable to further cover the cover body 30 with a light-shielding protective cover 32.

According to the third embodiment configured as described above, the lower surface 26a of the upper support plate 26, the upper surface 28a of the lower support plate 28, and the ball bearing 6 are hermetically sealed by the cover body 30. It is possible to prevent foreign matter such as dust from adhering to the body 8, infiltration of rainwater and the like, and generation of rust. Further, since the cover body 30 can be deformed in accordance with the relative displacement between the foundation 2 and the building 4, even if the upper support plate 12 and the lower support plate 14 relatively move in the horizontal direction during an earthquake, The cover 30 follows the movement, and no excessive force is applied to the cover 30.

The present invention is, of course, not limited to the above-described embodiment. For example, the seismic isolation support may be a sliding bearing in addition to a rolling bearing. Further, the structure of the cover body can be appropriately modified according to the structural shape of the seismic isolation support.

[0034]

As described above, according to the first aspect of the present invention, since the seismic isolation support is sealed by the cover body, foreign matter such as dust adheres to the seismic isolation support, and intrusion of rainwater or the like occurs. The generation of rust due to dew condensation can be prevented. At the same time, the cover body can be attached and detached from the seismic isolation support separately from the multiple divided parts,
During maintenance, it is not necessary to remove the entire cover, and by removing one or more portions of the cover, the inside of the seismic isolation support can be exposed. Therefore, the state of deterioration inside the seismic isolation support can be visually determined, and water and dust inside the support can be cleaned.

In the case of an integral cover, the structure must be lifted and the seismic isolation support must be disassembled.
Partial removal eliminates the need for cumbersome and expensive operations such as lifting structures and dismantling seismic isolation supports. In addition, when attaching the seismic isolation support, when the cover body is integral, it is necessary to attach the cover body to the seismic isolation support in advance, and the cover body tends to hinder the attachment of the seismic isolation support. If the cover body is divided as in the present invention, the cover body can be attached after the seismic isolation support is attached, so that it is not an obstacle.

According to the second aspect of the present invention, the rolling surface and the sliding surface can be surely covered with the cover at least in a normal state. Therefore, it is not necessary to consider the deformation of the cover body, and it is possible to prevent foreign matters such as dust and rainwater or the like from entering with a simple and inexpensive configuration.

In this case, it is possible to make it more difficult for foreign matters such as dust, rainwater and the like to penetrate. At the same time, if the other end is formed in a flange shape along the horizontal direction, the other end which is not fixed moves horizontally with respect to the periphery of the other rolling surface / sliding surface during an earthquake. Even
Interference between these rolling surfaces and the like and the cover body can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view of a base isolation structure according to a first embodiment.

FIG. 2 is a cross-sectional view of the seismic isolation structure of FIG.

FIG. 3 is an explanatory view of removing a cover body of the seismic isolation structure of FIG. 1;

FIG. 4 is a side view of a base isolation structure according to a second embodiment.

FIG. 5 is a sectional view of the seismic isolation structure of FIG.

FIG. 6 is a side view of a base isolation structure according to a third embodiment.

[Explanation of symbols]

2 Foundation 4 Building (example of structure) 6 Ball bearing 8 Seismic isolation support 10 Cover body 10 ₁ , 10 ₂ … Each part of cover body 12 Ball holder 14 Lower support plate 18 Isolation support 20 Upper support plate 22 cover body 24 seismic isolation support 26 upper support plate 28 lower support plate 30 cover body

Claims (3)

[Claims] 1. A seismic isolation structure for a structure having a seismic isolation support interposed between a foundation and a structure and supporting the structure horizontally and freely by a rolling bearing or a sliding bearing. A cover that covers a rolling surface or a sliding surface of the seismic isolation support, wherein the cover includes a plurality of portions that can be divided and attached and detached from the seismic isolation support. Seismically isolated cover body. 2. The cover body is made of a rigid body, and only one of the cover bodies is fixed to a foundation side or a structure side,
2. The cover body of the seismic isolation structure according to claim 1, wherein the periphery of the other end is slidably mounted on the periphery of the other rolling surface or sliding surface in a normal state. 3. The cover body of the seismic isolation structure according to claim 2, wherein the other end of the cover body is formed in a flange shape along the horizontal direction.