JP4480708B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device that is provided between a structure such as a building or a condominium and a floor in the room, and absorbs the vibration on the indoor side against the vibration of the structure caused by an earthquake.

In recent years, for example, in buildings and condominiums, in order to prevent the collapse of buildings due to an earthquake, there are many structures having high earthquake resistance strength. However, even if it is possible to building collapse prevent, when the shaking caused by an earthquake is intense, or furniture in the room to tip over, such as the equipment is scattered, there is a case of a large damage in the chamber side. Therefore, a seismic isolation device is provided between the slab of the structure and the floor of the room, and the seismic isolation device absorbs shaking for each room (for example, see Patent Document 1).
JP-A-10-102750

  By the way, if the seismic isolation device absorbs shaking for each room as described above, it is necessary to use a small seismic isolation device because the space under the floor is narrow. There is a problem in that the amount of movement in the horizontal direction with respect to roll cannot be sufficiently absorbed. In addition, after the shaking of the earthquake has ceased, the floor that has been displaced due to the rolling must return to its original position. In this case, a return spring that applies horizontal tension to the seismic isolation device is exempted. Since it is necessary to install it outside the seismic device, a separate installation space for the return spring is required, which makes it difficult to install under a narrow floor.

  The present invention has been made in view of the above problems, and the object of the present invention is to secure a sufficient amount of movement in the horizontal direction with respect to rolls even when configured in a small size, and to provide a seismic isolation object. An object of the present invention is to provide a seismic isolation device that does not require a separate spring to be returned to the original position.

In order to achieve the above object, the present invention provides a seismic isolation device that is disposed between a structure that is shaken with an earthquake and a seismic isolation object, and that absorbs the shaking of the earthquake transmitted from the structure side to the seismic isolation object side. A first substrate fixed to the structure, a second substrate fixed to the seismic isolation object, a support member that supports the second substrate so as to be movable in a horizontal direction, and the first substrate. A main shaft that is supported so as to be movable in the horizontal direction, and that supports the support member so as to be movable in the vertical direction; a cylindrical member that is disposed on the outer side of the main shaft at a radial interval and is fixed on the first substrate; A first elastic member that urges the support member upward; a second elastic member that is disposed between the main shaft and the cylindrical member, and that is elastically deformed by a compressive force generated by the horizontal movement of the cylindrical member with respect to the main shaft; A support portion connected to the second substrate and the support member and supporting the second substrate And a third elastic member elastically deformed by the tensile force of the by horizontal movement.

  Thus, the vertical movement of the earthquake is absorbed by the vertical movement of the support member supported by the main shaft, and the vertical movement is buffered by the first elastic member. In addition, the cylindrical member moves in the horizontal direction with respect to the main axis, and the main axis moves in the horizontal direction with respect to the second substrate, so that the roll of the earthquake is absorbed, and these movements are the second and third. It is buffered by the elastic member. That is, with respect to the horizontal movement on the structure side, the roll to the seismic isolation object side is absorbed by the movement of the cylindrical member and the movement of the main shaft. Further, after the shaking of the earthquake ceases, the main shaft is returned to the center position of the cylindrical member by the restoring force of the second elastic member, and the second substrate is moved to the center position by the restoring force of the third elastic member. Is returned to be positioned.

  According to the seismic isolation device of the present invention, the horizontal movement on the structure side can absorb the roll to the seismic isolation object side by the movement of the cylindrical member and the movement of the main shaft, and the structure is small. Even in such a case, it is possible to secure a sufficient amount of movement in the horizontal direction against rolling. In addition, the main shaft and the second substrate can be reliably returned to their original positions without separately providing a return spring, which is extremely advantageous when installing in a narrow space such as under the floor.

1 to 6 show an embodiment of the present invention. FIG. 1 is a side cross-sectional view of the seismic isolation device, FIG. 2 is a cross-sectional view in the direction of arrows AA in FIG. 1, and FIG. 4 is a partial cross-sectional plan view of the seismic isolation device, FIG. 5 is a side sectional view showing the operation of the seismic isolation device, and FIG. 6 shows an installation state of the seismic isolation device. It is side surface sectional drawing of a building.

The seismic isolation device 1 shown in the figure includes a first substrate 2 fixed to a structure, a second substrate 3 fixed to the seismic isolation object, and the second substrate 3 movable in the horizontal direction. A support member 4 to be supported, a main shaft 5 that is supported on the first substrate 2 so as to be movable in the horizontal direction, and that supports the support member 4 so as to be movable in the vertical direction; A first cylindrical member 6 supported on a single substrate 2 so as to be movable in the horizontal direction, and a second cylindrical member disposed radially outside the first cylindrical member 6 and fixed on the first substrate 2. The cylindrical member 7, the first elastic member 8 that biases the support member 4 upward, the horizontal movement of the first cylindrical member 6 relative to the main shaft 5, and the second cylindrical member relative to the first cylindrical member 6 7 and a plurality of second elastic members 9 that are elastically deformed by a compressive force generated by the movement in the horizontal direction. And a third elastic member 10 elastically deformed by a tensile force due to the horizontal movement of the member 4.

  The 1st board | substrate 2 consists of a flat member, and is fixed to the upper surface of the structure mentioned later.

  The 2nd board | substrate 3 consists of a flat member, and the seismic isolation object mentioned later is fixed to the upper surface. The second substrate 3 is provided with an extending portion 3a extending downward from the periphery thereof, and a plurality of connecting portions 3b to which one end of each third elastic member 10 is connected are provided at the lower end of the extending portion 3a. ing.

  The support member 4 includes a beam-shaped member 4a extending in the front-rear direction and the left-right direction, a first support plate 4b fixed to the upper surface of the beam-shaped member 4a, and a second support fixed to the lower surface of the beam-shaped member 4a. It consists of a plate 4c and a plurality of rollable balls 4d that movably support the second substrate 3 in the horizontal direction, and the other ends of the respective third elastic members 10 are connected to both ends of the beam-like member 4a. Each of the connecting portions 4e is provided. Each ball 4d is arranged on the upper surface of the first support plate 4b in the front-rear direction and the left-right direction, and is partitioned by the partition wall 4f.

  The main shaft 5 includes a cylindrical upper member 5 a and a lower member 5 b that are slidably engaged with each other in the vertical direction. The upper member 5 a is fixed to the second support plate 4 c of the support member 4. A plurality of balls 5c are provided on the lower surface of the lower member 5b so as to be capable of rolling with the first substrate 2, and the balls 5c are arranged at intervals in the circumferential direction of the main shaft 5.

  The first cylindrical member 6 includes a cylindrical upper member 6a and a lower member 6b that are slidably engaged with each other in the vertical direction. The upper member 6a is biased upward by a spring (not shown). The upper end of the upper member 6a and the lower end of the lower member 6b are respectively provided with a plurality of balls 6c that are slidably in contact with the support member 4 and the first substrate 2, and each ball 6c is a first cylindrical member. 6 are arranged at intervals in the circumferential direction.

  The second cylindrical member 7 includes a cylindrical upper member 7a and a lower member 7b that are slidably engaged with each other in the vertical direction. The upper member 7a is urged upward by an elastic member (not shown). A plurality of balls 7c are provided at the upper end of the upper member 7a so as to be capable of rolling with the support member 4, and the respective balls 7c are arranged at intervals in the circumferential direction of the second cylindrical member 7. The lower member 7 b is fixed to the first substrate 2.

  The first elastic member 8 includes a coil spring disposed in the main shaft 5, and an auxiliary elastic member 8 a including a coil spring having a smaller diameter than the first elastic member 8 is provided on the radially inner side. The first elastic member 8 and the auxiliary elastic member 8a are arranged in a compressed state between the lower surface of the support member 4 and the bottom surface in the main shaft 5, and respectively urge the support member 4 upward.

  Each second elastic member 9 is made of an annular hollow rubber extending in the circumferential direction of the main shaft 5, and is between the main shaft 5 and the first cylindrical member 6 and between the first cylindrical member 6 and the second cylindrical member 7. A plurality of them are stacked one above the other.

  Each third elastic member 10 is formed of a coil spring, and is connected to the connecting portion 3b of the second substrate 3 and the connecting portion 4e of the support member 4 in a tensioned state. In this case, each third elastic member 10 is provided obliquely such that the lower end side is farther from the main shaft 5 than the upper end side.

Seismic isolation device 1 configured as described above, for example, is installed in a building or apartment or the like as shown in FIG. That is, a plurality of seismic isolation devices 1 are arranged between the slab 21 of the structure 20 and the floor 23 of the room 22 as a seismic isolation object. In this case, the first substrate 2 of the seismic isolation device 1 is fixed to the slab 21, and the second substrate 3 is fixed to the floor 23.

Here, when the structure 20 is shaken by an earthquake, the shake to the room 22 is absorbed by each seismic isolation device 1. At that time, the upper member 5 a of the main shaft 5, the support member 4, and the second substrate 3 move up and down with respect to pitching, and these vertical movements are buffered by the compression of the first elastic member 8 in the main shaft 5. Is done. Also, for the rolling, while moving in the horizontal direction with respect to the second cylindrical member 7 is first cylindrical member 6 as shown in FIG. 5, the first cylindrical member 6 to the main axis 5 It moves in the horizontal direction, and these movements are buffered by the compression of each second elastic member 9. Further, the support member 4 moves in the horizontal direction together with the main shaft 5, and these movements are buffered by the extension of each third elastic member 10. Thus, the horizontal movement L toward the interior 22 is absorbed by the movement L1 of the cylindrical members 6 and 7 and the movement L2 of the main shaft 5 and the support member 4 with respect to the horizontal movement L on the structure 20 side. After the shaking of the earthquake ceases, the main shaft 5 is returned to the center position of the second cylindrical member 7 by the restoring force of each second elastic member 9, and the second elastic member 10 restores the second axis by the restoring force of each third elastic member 10. The substrate 3 is returned so that the main shaft 5 is positioned at the center position.

  Thus, according to the seismic isolation device of the present embodiment, the support member 4 that supports the seismic isolation object side is supported by the main shaft 5 so as to be movable in the vertical direction, and the first elastic member provided on the main shaft 5 Since the support member 4 is urged upward by the auxiliary elastic member 8a, the pitching due to the earthquake can be effectively absorbed. Further, the second substrate 3 fixed to the seismic isolation object is supported by the support member 4 so as to be movable in the horizontal direction, and the main shaft 5 supporting the support member 4 is fixed to the structure 20 side. Since it is supported on the substrate 2 so as to be movable in the horizontal direction, the movement L1 of the cylindrical members 6 and 7 and the movement L2 of the main shaft 5 and the support member 4 with respect to the horizontal movement L on the structure 20 side. Thus, the roll to the seismic isolation object side can be absorbed, and even in the case of a small configuration, a sufficient amount of horizontal movement with respect to the roll can be secured. In this case, after the shaking of the earthquake ceases, the main shaft 5 and the second substrate 3 are returned to their original positions by the second elastic members 9 and the third elastic members 10, so that the return spring is used. There is no need to install it outside, which is extremely advantageous when installing in a narrow space under the floor.

  In addition, since the auxiliary elastic member 8a for urging the support member 4 together with the first elastic member 8 is provided, the auxiliary elastic member 8a can be arbitrarily provided according to the weight of the seismic isolation object. It is possible to improve the performance. In this case, the auxiliary elastic member 8a is formed by a coil spring having a diameter smaller than that of the first elastic member 8, and the auxiliary elastic member 8a is disposed inside the first elastic member 8 in the radial direction. There is no need to separately secure a space for the member 8a, and there is an advantage that the main shaft 5 is not enlarged.

  Furthermore, since the second elastic member 9 is formed of a hollow annular rubber extending in the circumferential direction of the main shaft 5, an elastic force that is always directed toward the central direction can be generated at any position in the circumferential direction of the main shaft 5, The main shaft 5 can be reliably returned to the center position of each cylindrical member 6, 7. In this case, since the plurality of second elastic members 9 are stacked in the vertical direction, the elastic force is arbitrarily set according to the size of the seismic isolation object, etc., depending on the number of the second elastic members 9. In addition, there is an advantage that even if the number of the second elastic members 9 increases, the size does not increase in the radial direction.

  In addition, since the third elastic member 10 is provided at a plurality of locations in the circumferential direction of the main shaft 5, the second substrate 3 can be reliably returned to the position where the main shaft 5 is the center. Furthermore, one end of the third elastic member 10 is connected to the connecting portion 4 e of the support member 4, and the other end is connected from the second substrate 3 to the extending portion 3 a extending downward from the connecting portion 4 e of the support member 4. Since it did in this way, the 3rd elastic member 10 can be arrange | positioned so that it may expand-contract to an up-down direction, and there exists an advantage that it is not necessary to ensure the expansion / contraction space of the 3rd elastic member 10 largely in the radial direction of the main axis | shaft 5. is there.

  In this case, since each third elastic member 10 is provided obliquely so that the lower end side is farther from the main shaft 5 than the upper end side, the horizontal elastic member 10 is always horizontally disposed between the second substrate 3 and the main shaft 5. An elastic force can be applied, and the position of the second substrate 3 with respect to the main shaft 5 can be more reliably held at the center position.

  In addition, although the thing provided with the two cylindrical members 6 and 7 was shown in the said embodiment, you may make it provide only one or three or more cylindrical members. Moreover, in the said embodiment, although what was made to absorb the shaking of the room | chamber 22 with respect to structures 20, such as a building, the seismic isolation apparatus of this invention is the whole structures, such as a building, a condominium, and a general house. It can also be applied to those provided between the foundation.

Side surface sectional drawing of the seismic isolation apparatus which shows one Embodiment of this invention AA arrow direction sectional view of FIG. BB sectional view taken along line BB in FIG. Partial cross-sectional plan view of seismic isolation device Side sectional view showing operation of seismic isolation device Side sectional view of the building showing the installation status of seismic isolation devices

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Seismic isolation apparatus, 2 ... 1st board | substrate, 3 ... 2nd board | substrate, 3a ... Extension part, 4 ... Support member, 5 ... Main axis | shaft, 6 ... 1st cylindrical member, 7 ... 2nd cylindrical member , 8 ... 1st elastic member, 8a ... Auxiliary elastic member, 9 ... 2nd elastic member, 10 ... 3rd elastic member, 20 ... Structure, 22 ... Indoor.

Claims (5)

In a seismic isolation device that is placed between a structure that is shaken with an earthquake and the seismic isolation object and absorbs the shaking of the earthquake transmitted from the structure side to the seismic isolation object side,
A first substrate fixed to the structure;
A second board fixed to the seismic isolation object;
A support member for supporting the second substrate movably in the horizontal direction;
A main shaft supported on the first substrate so as to be movable in the horizontal direction and supporting the support member so as to be movable in the vertical direction;
A cylindrical member disposed radially outside the main shaft and fixed on the first substrate;
A first elastic member for urging the support member upward;
A second elastic member disposed between the main shaft and the cylindrical member, and elastically deformed by a compressive force generated by the horizontal movement of the cylindrical member with respect to the main shaft;
And a third elastic member coupled to the second substrate and the support member and elastically deformed by a tensile force generated by the horizontal movement of the support member relative to the second substrate. An auxiliary elastic member for urging the support member upward together with the first elastic member;
The first elastic member is formed by a coil spring, the auxiliary elastic member is formed by a coil spring having a diameter smaller than that of the first elastic member, and the auxiliary elastic member is disposed on the radial inner side of the first elastic member. The seismic isolation device according to claim 1. The said 2nd elastic member is formed with the hollow annular rubber extended in the circumferential direction of a main axis | shaft, The several 2nd elastic member was mutually stacked | piled up and down, and it has arrange | positioned. Seismic isolation device. The third elastic member is provided at a plurality of locations in the circumferential direction of the main shaft, and one end of the third elastic member is connected to the support member, and the other end is connected to an extending portion extending downward from the connection portion with the support member from the second substrate. The seismic isolation device according to claim 1, 2, or 3. 5. The seismic isolation device according to claim 4, wherein each of the third elastic members is provided obliquely such that the lower end side is more distant from the main shaft than the upper end side.

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