JP6338099B2 - Slip isolation mechanism - Google Patents

Description

  The present invention relates to a sliding seismic isolation mechanism.

  Conventionally, two plate materials having appropriate friction characteristics are arranged on the structure floor, and the lower plate material is fixed to the structure floor so that the upper plate is movable relative to the lower plate material in the horizontal direction. A sliding seismic isolation mechanism is known in which a restoring device using a constant load spring is installed between a plate material and a structural floor (see, for example, Patent Document 1). Such a seismic isolation mechanism has high seismic isolation performance, hardly causes residual displacement after an earthquake, can simplify the structure and can be thinned, and can reduce installation costs.

JP 2013-064418 A

In the sliding seismic isolation mechanism disclosed in Patent Document 1, a plurality of restoration devices are installed on the outer peripheral portion of the seismic isolation floor (upper plate member), and thus these restoration devices may interfere with traffic. Moreover, if the installation space for the restoration device is secured on the outer periphery of the base isolation floor, the area of the base isolation floor may be reduced, and the usability may deteriorate.
Moreover, in such a base isolation mechanism, in order to maintain the base isolation performance for a long time, it is necessary to prevent damage to the constant load spring due to the vibration of the earthquake.

  Therefore, an object of the present invention is to provide a sliding seismic isolation mechanism that can effectively utilize the outer peripheral portion of the seismic isolation floor and that can prevent damage to the constant load spring due to earthquake vibration.

In order to achieve the above object, a sliding seismic isolation mechanism according to the present invention comprises a plate-shaped seismic isolation floor configured to be slidable in a horizontal direction on a support part and formed with an opening penetrating in a vertical direction, and the support. In a sliding seismic isolation mechanism comprising: a restoration device capable of restoring a displacement of the seismic isolation floor relative to the support portion, wherein the restoration device is installed on an upper surface of the seismic isolation floor A constant load spring, and a connecting member that connects the constant load spring and the support portion, the connecting member connecting the support portion inside the opening. To do.

In the present invention, the connecting material for connecting the constant load spring and the support portion connects the support portion inside the opening of the base isolation floor, so that the restoring device is not installed on the outer peripheral portion of the base isolation floor. Therefore, the outer periphery of the seismic isolation floor can be used effectively. Moreover, since it is not necessary to ensure the space which installs a decompression | restoration apparatus in the outer peripheral part of a base isolation floor, the area of a base isolation floor can be set large.
In addition, since the seismic isolation floor has less vibration (sway) when an earthquake occurs than the support part, the constant load spring is less damaged by the earthquake vibration than when a constant load spring is installed in the support part. Can be prevented.

In addition, when installing a restoration device on the outer periphery of the base isolation floor, the recovery device connecting the support part is installed inside the opening of the base isolation floor, so that The number of restoration devices installed can be reduced or the scale can be reduced.
In particular, when the area of the base isolation floor is large and heavy objects are mounted on the base isolation floor, the restoration device is installed not only on the outer periphery of the base isolation floor but also inside the base isolation floor. It is possible to prevent the restoration device from being completely installed on the outer periphery, or the outer periphery of the seismic isolation floor from being completely filled with the restoration device.
Compared with the case where the restoration device is installed only on the outer periphery of the base isolation floor, the restoration device can be arranged in a balanced manner by installing the restoration device inside the base isolation floor, and the number of restoration devices installed can be reduced. Since it can be secured sufficiently, it is possible to prevent an increase in in-plane stress of the base isolation floor.

Further, in the sliding seismic isolation mechanism according to the present invention, it is preferable that a plurality of bundles are erected on the upper part of the seismic isolation floor, and a floor panel is laid on the upper part of the plurality of bundles. .
By setting it as such a structure, a floor panel is arrange | positioned also at the upper part of the opening part of a base isolation floor, and a flat floor surface can be formed in the upper part of a base isolation floor.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to utilize effectively the outer peripheral part of a seismic isolation floor, the damage of a constant load spring by the vibration of an earthquake can be prevented compared with the case where a constant load spring is installed in a support part.

(A) is a top view which shows an example of the sliding seismic isolation mechanism by 1st Embodiment of this invention, (b) is the sectional view on the AA line of (a). It is a top view which shows an example of the sliding seismic isolation mechanism by 2nd Embodiment of this invention. It is a top view which shows an example of the sliding seismic isolation mechanism by 3rd Embodiment of this invention. (A) is a top view which shows an example of the sliding seismic isolation mechanism by 4th Embodiment of this invention, (b) is the BB sectional drawing of (a).

(First embodiment)
Hereinafter, a sliding seismic isolation mechanism according to a first embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 1, a sliding seismic isolation mechanism 1A according to the present embodiment is installed on a structural floor (supporting portion) 11 of an earthquake-resistant building, and has a steel plate 2 fixed to the structural floor 11 and an upper surface 2a of the steel plate 2. And a plurality of restoring devices 4 that connect the structural floor 11 and the seismic isolation floor 3 to restore displacement of the base isolation floor 3 relative to the structural floor 11.

The steel plate 2 is an embossed steel plate or the like that has been embossed such that a fine projection protrudes upward from the upper surface 2a. The outer shape of the steel plate 2 is formed in a substantially rectangular shape in plan view. Further, the steel plate 2 has one opening 21 </ b> A that penetrates in the center in the vertical direction and has a substantially square shape in plan view. The steel plate 2 is formed in a size larger than the range in which the seismic isolation floor 3 can slide.
An anchor bolt 12 whose upper side protrudes upward from the floor surface of the structural floor 11 is inserted into the structural floor 11, and the steel plate 2 is disposed so that the anchor bolt 12 is arranged at the center of the opening 21 </ b> A of the steel plate 2. Is fixed to the floor of the structural floor 11.

The seismic isolation floor 3 is a plate-like member whose plate surface faces in the up-down direction, and is formed in a substantially rectangular shape whose outer shape is slightly smaller than the steel plate 2 in plan view. The seismic isolation floor 3 has one opening 31 </ b> A penetrating in the vertical direction in the center and having a substantially square shape in plan view. The opening 31 </ b> A of the seismic isolation floor 3 is formed in substantially the same size as the opening 21 </ b> A of the steel plate 2. And when the seismic isolation floor 3 is installed in the upper surface 2a of the steel plate 2, the anchor bolt 12 is arrange | positioned inside the opening part 31A of the seismic isolation floor 3. FIG.
The seismic isolation floor 3 is configured to be slidable on the steel plate 2 in a state where the lower surface 3b is in contact with the upper surface 2a of the steel plate 2, and is configured to be movable relative to the steel plate 2 in the horizontal direction. The seismic isolation floor 3 that slides on the upper surface 2 a of the steel plate 2 is set so as not to contact the anchor bolt 12 by the restoring device 4.

The restoring device 4 includes a constant load spring 42 housed in a case 41 fixed to the upper surface 3 a of the base isolation floor 3, and a wire (connecting material) 43 that connects the constant load spring 42 and the anchor bolt 12. Have.
The wire 43 is formed of a material that does not expand and contract in the present embodiment, and is configured to be loosened when the constant load spring 42 comes close to the anchor bolt 12 and to be stretched when the constant load spring 42 is separated from the anchor bolt 12. Has been. When the constant load spring 42 moves away from the anchor bolt 12 and a tension other than a predetermined value acts on the wire 43, the constant load spring 42 expands. When the tension acting on the wire 43 decreases, the constant load spring 42 It is configured to contract. The constant load spring 42 is allowed to move in the horizontal direction between the structural floor 11 and the base isolation floor 3 by expanding and contracting.
Such a restoring device 4 is provided with a pre-tension force as a pre-load on the constant load spring 42 and can restrain an excessive displacement of the base isolation floor 3 with respect to the structural floor 11 when an earthquake occurs. The seismic isolation floor 3 displaced with respect to the structural floor 11 can be restored to its original position.

  And in this embodiment, the case 41 in which the constant load spring 42 was accommodated on the upper surface 3a of the base isolation floor 3 is fixed in the vicinity of the center of each side of the substantially square edge of the opening 31A of the base isolation floor 3 respectively. The constant load springs 42 are connected to the anchor bolts 12 by wires 43, respectively. For this reason, the constant load springs 42 adjacent to each other along the edge of the opening 31A of the base isolation floor 3 are configured to expand and contract in directions orthogonal to each other.

Next, the operation and effect of the above-described sliding seismic isolation mechanism 1A will be described with reference to the drawings.
In the sliding seismic isolation mechanism 1 </ b> A according to the first embodiment described above, the anchor bolt 12 connected to the wire 43 of the restoring device 4 is disposed inside the opening 31 </ b> A of the seismic isolation floor 3. Since it is not necessary to install in the outer peripheral part of the base isolation floor 3, the outer peripheral part of the base isolation floor 3 can be utilized effectively. Moreover, since it is not necessary to ensure the space which installs the decompression | restoration apparatus 4 in the outer peripheral part of the seismic isolation floor 3, the area of the seismic isolation floor 3 can be set large.
In addition, since the seismic isolation floor 3 has less vibration (sway) when an earthquake occurs compared to the structural floor 11, compared to the case where the constant load spring 42 is fixed to the structural floor 11, the constant load due to the earthquake vibration. Damage to the spring 42 can be prevented.

  In addition, in this embodiment, although the restoration | repair apparatus is not installed in the outer peripheral part of the seismic isolation floor 3, it combines with the restoration | repair apparatus 4 which has connected the anchor bolt 12 inside 31 A of openings, A restoring device may be installed on the outer periphery. For this reason, also when installing a restoring device also in the outer peripheral part of the seismic isolation floor 3, by having installed the restoring device 4 which has connected the anchor bolt 12 inside the opening part 31A of the seismic isolation floor 3, The number of restoration devices installed on the outer periphery of the seismic isolation floor 3 can be reduced or the scale can be reduced.

In particular, when the area of the base isolation floor 3 is large and a heavy object is mounted on the base isolation floor 3, the restoration device 4 is installed not only on the outer periphery of the base isolation floor 3 but also inside the base isolation floor 3. It is possible to prevent the restoration device 4 from being installed on the outer peripheral portion of the base isolation floor 3 or the outer peripheral portion of the base isolation floor 3 from being completely filled with the recovery device 4.
In addition, compared to the case where the restoration device 4 is installed only on the outer peripheral portion of the base isolation floor 3, the restoration device 4 can be arranged in a well-balanced manner by installing the restoration device 4 inside the base isolation floor 3. Since a sufficient number of devices 4 can be secured, an increase in in-plane stress of the seismic isolation floor 3 can be prevented.

Next, other embodiments will be described with reference to the accompanying drawings, but the same or similar members and parts as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted. A different configuration will be described.
(Second Embodiment)
As shown in FIG. 2, in the sliding seismic isolation mechanism 1 </ b> B according to the second embodiment, a plurality of openings 21 </ b> B are formed in the steel plate 2, and a plurality of anchor bolts 12 are installed on the structural floor 11. And when the steel plate 2 is fixed to the structural floor 11, the anchor bolt 12 is each arrange | positioned in the center of each opening part 21B.
In the present embodiment, the steel plate 2 is measured by three in the horizontal direction (hereinafter referred to as the X direction), three by three, and by three in the horizontal direction orthogonal to the X direction (hereinafter, the Y direction). Nine openings 21B are arranged.

  The seismic isolation floor 3 is formed with a plurality of substantially square openings (9 openings in this embodiment) 31 </ b> B in plan view so as to correspond to the steel plate 2. And when the seismic isolation floor 3 is installed in the upper surface 2a of the steel plate 2, the anchor bolt 12 is arrange | positioned inside the opening part 31B of the seismic isolation floor 3. FIG.

  The restoration device 4 is installed so as to correspond to each of the openings 31B of the seismic isolation floor 3, and nine restoration devices 4 are installed in the present embodiment. Also in the second embodiment, as in the first embodiment, the constant load spring is applied to the upper surface 3a of the base isolation floor 3 in the vicinity of the center of each side of the substantially square edge of each opening 31B of the base isolation floor 3. Cases 41 in which 42 are accommodated are respectively installed, and the constant load springs 42 are connected to the anchor bolts 12 by wires 43, respectively.

In the sliding seismic isolation mechanism 1B according to the second embodiment, the same effects as those of the first embodiment are obtained, and a plurality of restoring devices 4 are provided inside the seismic isolation floor 3 when the seismic isolation floor 3 is installed in a wide space. Therefore, it is possible to adopt a form in which the restoring device 4 is not installed on the outer periphery of the seismic isolation floor 3.
Further, since the plurality of restoring devices 4 are arranged in a well-balanced manner, it is possible to prevent the seismic isolation floor 3 from being twisted.

(Third embodiment)
As shown in FIG. 3, the sliding seismic isolation mechanism 1 </ b> C according to the third embodiment has a substantially well-shaped opening 21 </ b> C formed in the steel plate 2 in plan view, and a plurality of anchor bolts on the structural floor 11. 12 is installed. And when the steel plate 2 is fixed to the floor surface of the structural floor 11, the several anchor bolt 12 is arrange | positioned inside 21 C of opening parts.
The substantially well-shaped shape of the opening 21 </ b> C includes two elongated rectangles 22 extending in the X direction and spaced apart in the Y direction, and spaced in the X direction extending in the Y direction. The two elongated rectangles 23 are orthogonal to each other, and the anchor bolts 12 are disposed at positions corresponding to the vicinity of the both ends in the extending direction of each of the rectangles 22 and 23 and the center.

Further, the base-isolated floor 3 is formed with a substantially well-shaped opening 31 </ b> C in plan view so as to correspond to the steel plate 2. And when the seismic isolation floor 3 is installed in the upper surface 2a of the steel plate 2, the anchor bolt 12 is arrange | positioned inside the opening part 31C of the seismic isolation floor 3. FIG.
The substantially well-shaped shape of the opening 31C includes two elongated rectangles 32 extending in the X direction and spaced apart in the Y direction, and spaced in the X direction extending in the Y direction. The two elongated rectangles 33 are orthogonal to each other.

The restoring device 4C is installed at positions corresponding to the vicinity of the both ends in the extending direction of the respective rectangles 32 and 33 constituting the opening 31C of the seismic isolation floor 3 and the center.
In the present embodiment, the restoring device 4C includes a case 41 in which constant load springs 42 are accommodated at positions facing the anchor bolt 12 with respect to one anchor bolt 12, respectively. 4C has two constant load springs 42 and two wires 43.

And, with respect to the anchor bolt 12 arranged inside the rectangle 22 extending in the X direction in the opening portion 21C of the steel plate 2, two constant load springs 42 are centered on the anchor bolt 12 in the Y direction. Oppositely, it is comprised so that the displacement of the Y direction of the seismic isolation floor 3 with respect to the steel plate 2 can be decompress | restored. Further, of the opening 21C of the steel plate 2, with respect to the anchor bolt 12 arranged inside the rectangle 23 extending in the Y direction, two constant load springs 42 are centered on the anchor bolt 12 in the X direction. Oppositely, it is comprised so that the displacement of the X direction of the seismic isolation floor 3 with respect to the steel plate 2 can be decompress | restored.
The sliding seismic isolation mechanism 1C according to the third embodiment has the same effects as those of the second embodiment.

(Fourth embodiment)
As shown in FIG. 4, the sliding seismic isolation mechanism 1D according to the fourth embodiment has a plurality of bundles 5 standing on the upper part of the seismic isolation floor 3 arranged in the same manner as the sliding seismic isolation mechanism 1B according to the second embodiment. A floor panel 6 is laid on top of the plurality of bundles 5.
A plurality of bundles 5 are arranged at intervals in the X direction and the Y direction at positions that do not interfere with the opening 31 </ b> B of the seismic isolation floor 3 and the restoring device 4. The floor panel 6 is a plate-like member in which no opening is formed. In this embodiment, the outer shape in plan view is slightly smaller than the outer shape of the seismic isolation floor 3. The bundle 5 and the floor panel 6 are configured to be movable relative to the steel plate 2 along with the seismic isolation floor 3 in the horizontal direction.

  In the sliding seismic isolation mechanism 1D according to the fourth embodiment, the same effects as those of the second embodiment can be obtained, and a flat floor surface can be formed on the upper surface 6a of the floor panel 6. Further, since the restoration device 4 is disposed between the seismic isolation floor 3 and the floor panel 6, it is possible to prevent the restoration device 4 from being damaged by falling objects from above the floor panel 6.

As mentioned above, although embodiment of the slide seismic isolation mechanism 1A-1D by this invention was described, 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 above embodiment, the openings 21A to 21C and 31A to 31C of the steel plate 2 and the seismic isolation floor 3 are formed in a substantially square shape or a substantially well shape, but are formed in an arbitrary shape. May be. Moreover, the shape of the opening parts 21A-21C of the steel plate 2 and the shape of the opening parts 31A-31C of the base isolation floor 3 may not correspond. Moreover, the number and arrangement | positioning of opening part 21A-21C, 31A-31C may be set arbitrarily. Moreover, the opening parts 21A-21C do not need to be formed in the steel plate 2. Moreover, the shapes of the steel plate 2 and the seismic isolation floor 3 may be arbitrarily set.

Moreover, in said embodiment, although the seismic isolation floor 3 is comprised so that sliding is possible on the upper surface 2a of the steel plate 2, you may be comprised so that the base isolation floor 3 can slide directly on the floor surface of the structure floor 11. FIG. .
Further, in the above embodiment, the same restoring devices 4 and 4C as those in the above embodiment may be installed on the outer peripheral portion of the base isolation floor 3.
In the first embodiment and the third embodiment, a plurality of bundle members 5 are installed on the upper surface 3a of the seismic isolation floor 3 and the floor panel 6 is installed on the upper portion of the bundle members 5 in the same manner as the fourth embodiment. May be. Moreover, the member which is installed in the upper part of the seismic isolation floor 3 and comprises a floor is good also as members other than the some bundle material 5 and the floor panel 6 by 4th Embodiment.

Alternatively, a plurality of seismic isolation mechanisms 1A according to the first embodiment may be arranged on the floor surface of the structural floor 11 and adjacent seismic isolation floors 3 may be connected.
In the above embodiment, the anchor bolt 12 is inserted into the structural floor 11, and the structural floor 11 and the constant load spring 42 are connected by the wire 43 via the anchor bolt 12. The constant load spring 42 may be directly connected with the wire 43, or the structural floor 11 and the seismic isolation floor 3 may be connected to the structural floor 11 or the steel plate 2 by pins or taps instead of the anchor bolt 12. May be connected.
In the above embodiment, the constant load spring 42 is installed on the upper surface 3 a of the base isolation floor 3, but it may be installed on the side surface of the base isolation floor 3. In the fourth embodiment, the constant load spring 42 may be installed on the bundle 5 or the floor panel 6.

1A-1D Sliding seismic isolation mechanism 2 Steel plate 3 Seismic isolation floor 4, 4C Restoration device 5 Bundling material 6 Floor panel 11 Structure floor (supporting part)
12 Anchor bolt 31A-31C Opening 41 Case 42 Constant load spring 43 Wire (connecting material)

Claims (2)

A plate-shaped seismic isolation floor that is configured to be slidable in the horizontal direction on the support part and has an opening that penetrates in the vertical direction;
In the sliding seismic isolation mechanism comprising: the support part and the base isolation floor coupled, and a restoring device capable of restoring the displacement of the base isolation floor relative to the support part,
The restoration device includes a constant load spring installed on an upper surface of the seismic isolation floor , and a connecting member that connects the constant load spring and the support portion, and the connecting member is located inside the opening. A sliding seismic isolation mechanism characterized in that the support portions are connected in the above.   The sliding seismic isolation mechanism according to claim 1, wherein a plurality of bundle members are erected on an upper portion of the seismic isolation floor, and a floor panel is laid on the upper portions of the plurality of bundle members. .

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