JP2005226423A - Base isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolation device capable of absorbing vertical swinging and lateral swinging of a building, superior in the base isolation function, inexpensive with a simple structure, and suitable for a relatively small-scale building such as a wooden building and a low story concrete building. <P>SOLUTION: A pan surface 9 forming a downward inclination toward a central part, is arranged on an upper surface of a base member 1 fixed on a foundation of the building. A vertically movable sleeve 3 and an elastic body 4 contractibly arranged between this sleeve 3 and an upper quake receiving member 2, are held by the upper quake receiving member 2 fixed to a sill. The sleeve 3 is arranged on a steel ball 5 rollably arranged on the pan surface 9 of the base member 1. The base member 1 and the upper quake receiving member 2 are joined by a plurality of latch mechanisms 6 vertically joined so as to be engageable and disengageable and a plurality of springs 7 for mutually drawing the base member 1 and the upper quake receiving member 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a seismic isolation device suitable for a wooden building or a low-rise concrete building, which is disposed between a foundation and a base of a building and absorbs vertical and horizontal shaking of the building when an earthquake occurs.

  It is known that wooden buildings such as general buildings are structurally inferior in earthquake resistance compared to steel bars and steel buildings, and it is clear from the fact that many wooden houses collapsed in the previous earthquake.

  Since the previous earthquake, interest in building seismic isolation has increased, and for this reason, seismic isolation devices have been proposed and adopted for large buildings such as buildings and condominiums.

  As a conventional seismic isolation device, for example, an inclined dish surface is provided on the upper surface of a base member fixed on the foundation of a building, and the building is supported by a steel ball placed on the dish surface. A rolling ball is used to release the roll from the building, and a support member that constantly supplies pressure fluid is placed on the foundation of the building, and the building is supported by this support member. Has been proposed that absorbs the vibration of the above by controlling the pressure fluid.

  By the way, it is well known that the vibration transmission mechanism in an earthquake starts with vertical vibration and then shifts to roll.

  However, since the conventional seismic isolation device such as the former does not have a seismic isolation function for vertical vibrations, the building is directly subjected to vertical vibrations, resulting in a problem that the seismic isolation function is extremely low.

Moreover, the seismic isolation device using the pressure fluid such as the latter is a large-scale device as a whole, and is difficult to adopt for relatively small buildings such as wooden buildings and low-rise concrete buildings.
As the building's interest in seismic isolation increases, it can be used for relatively small buildings such as wooden buildings, has an excellent seismic isolation effect, is simple in structure, and is inexpensive. The current situation is that a proposal for a seismic isolation device is awaited.

  Therefore, the problem of the present invention is that it can absorb the vertical and horizontal shaking of the building, has an excellent seismic isolation function, is simple in structure and inexpensive in price, and is used for wooden buildings and low-rise concrete buildings. It is to provide a seismic isolation device suitable for such a relatively small building.

  In order to solve the above-described problems, the present invention is a seismic isolation device that is arranged between a foundation and a foundation of a building and absorbs the vertical movement and roll of the building, and is fixed on the foundation. An upper receiving member that is fixed to the base in a state of being opposed to the base member and is provided with a plate surface that is inclined downward toward the center, and a sleeve that can be moved up and down, and the sleeve and the upper receiving member An elastic body contracted between the members is held, and the sleeve is placed on a steel ball arranged so as to be able to roll on the dish surface of the base member, and the base member and the upper seismic receiving member are A structure in which a plurality of latch mechanisms that are vertically coupled so as to be able to be engaged and disengaged, and a plurality of springs that draw the base member and the upper seismic receiving member together is employed.

  A concave portion in which a steel ball is stably stored is formed in the central portion of the dish surface provided on the upper surface of the base member, and the latch mechanism is provided with an engagement piece provided on the upper seismic receiving member side, and the engagement piece. It is formed with a hook metal fitting pivoted on the base member side so that it can be freely engaged and disengaged. When the base member and the upper seismic receiving member come closer than the set interval, the hook metal piece is automatically detached from the locking piece. It can be set as the structure which becomes.

  Here, the base member is fixed on the foundation of the building by fastening with a bolt, becomes a peripheral wall that rises around the dish surface, and prevents the steel ball from rolling out. A hook metal fitting is pivoted at a position around the outer side of the door so that it can be raised and lowered.

  The upper seismic receiving member is fixed to the lower surface of the base of the building by fastening with a bolt, and an elastic body using a sleeve and a strong disc spring is housed in a cylindrical portion provided at the center of the lower surface. A hemispherical recess that is externally fitted to the steel ball is formed at the lower portion thereof, and a locking piece is provided on the outer side surrounding the cylindrical portion so as to protrude downward in an arrangement corresponding to the hook fitting.

  Furthermore, the spring that pulls the base member and the upper receiving member together is locked with the upper and lower ends of the base member and the upper receiving member, and the lower part of the upper receiving member on the lower surface where the spring is housed in the locking portion. A large-diameter cylindrical skirt is provided.

  According to the present invention, the upper surface of the base member fixed on the foundation is provided with a dish surface that is inclined downward toward the center, and is an upper seismic receiving member that is fixed to the base. Holding the elastic body contracted between the upper seismic receiving member, placing the sleeve on a steel ball arranged to be able to roll on the dish surface, the base member and the upper seismic receiving member, In addition to being coupled with springs, it has been coupled up and down with multiple latch mechanisms that can be engaged and disengaged, so the initial pitching at the time of the earthquake can be absorbed by the contraction of the elastic body, and also following the pitching The roll can be absorbed by the phase shift between the plate surface of the base member and the steel ball and by the spring, which effectively absorbs both the pitch and roll caused by the occurrence of the earthquake, thereby causing the vibration of the earthquake. Make sure to protect the building from It will be possible.

  In addition, the simple structure of the base member, the upper receiving member, the sleeve, the elastic body, and the steel ball has the effect that the structure is simple, the production cost is low, the installation is simple, and the construction period is short. It is ideal as a seismic isolation device for relatively small buildings such as wooden buildings.

  An upper seismic receiving member that is provided on the upper surface of the base member that is fixed on the foundation and that is inclined downward toward the center and is fixed to the base in a state of being opposed to the base member; The elastic member contracted between the sleeve and the upper receiving member is held, and the sleeve is placed on a steel ball arranged so as to be able to roll on the dish surface of the base member. The upper receiving member and the upper receiving member are connected to each other by a plurality of latch mechanisms that are vertically connected so as to be detachable and a plurality of springs that draw the base member and the upper receiving member together.

  As shown in the figure, the seismic isolation device includes a base member 1 fixed on a foundation B of a building A, an upper receiving member 2 fixed on a base C in a state of being opposed to the base member 1, and an upper receiving member. 2, a sleeve 3 and an elastic body 4 held so as to be movable up and down, a steel ball 5 having a diameter of about 50 mm arranged between the base member 1 and the sleeve 3, the base member 1 and the upper seismic receiving member 2. Are composed of a plurality of latch mechanisms 6 that are vertically coupled so that they can be engaged and disengaged, and a plurality of springs 7 that draw the base member 1 and the upper seismic receiving member 2 together.

  The base member 1 is a circular dish plate having a dish surface 9 which is placed on the foundation B of the building A and fastened with bolts or the like, and has a dish surface 9 which is inclined downward toward the center on the upper surface. A portion 10 is provided, and the outer periphery of the dish surface 9 is a peripheral wall 11 rising so that the steel ball 5 does not roll out, and a recess 12 in which the steel ball 5 is stably stored is formed at the center of the dish surface 9. ing.

  The upper seismic receiving member 2 is provided with a cylindrical portion 14 projecting downward at the center of the lower surface of a plate 113 that is overlapped with the lower surface of the base C and fastened with a bolt or the like. A free-running circular sleeve 3 and an elastic body 4 using a plurality of disc springs which are contracted between the sleeve 3 and the plate 13 and have a strong compression resistance are accommodated. In addition, a hemispherical recess 15 is formed which is externally fitted to the steel ball 5 so as to allow rotation.

  The latch mechanism 6 fixes a total of four brackets 16 to the outer peripheral surface of the plate portion 10 in the base member 1 at equal intervals in the circumferential direction, and pivots the lower end of the hook fitting 17 to each bracket 16. The hook metal member 17 can be pivoted up and down with a pivoting portion to the bracket 16 as a fulcrum, and is automatically tilted outward from the standing posture by increasing the weight on the tip side.

  Locking pieces 18 project downward from the lower surface of the upper seismic receiving member 2 so as to be arranged corresponding to the hook metal fittings 17 so as to correspond to the hook fittings 17, and the steel balls 5 are accommodated in the recesses 12. In the state where the elastic body 4 contracted between the sleeve 3 on the steel ball 5 and the upper seismic receiving member 2 is compressed by the weight of the building A at rest, when the hook metal fitting 17 is raised, The hook can be engaged with the bent portion at the lower end of the locking piece 18.

  In this way, when the hook metal member 17 and the locking piece 17 are engaged, the base member 1 and the upper seismic receiving member 2 are coupled up and down with the elastic body 4 compressed, and the building A with respect to the foundation B Is fixed, and the base member 1 rises due to vertical shaking when an earthquake occurs, and the elastic body 4 is compressed and contracts to absorb vertical shaking. At this time, the hook fitting 17 rises. Thus, the restraint of the locking with the locking piece 18 is released, and the hook metal member 17 is detached from the locking piece 18 by tilting outward with its own weight, and the base member 1 and the upper seismic receiving member 2 are vertically moved. The bond will be broken.

  In addition, the tensioned spring 7 that pulls the base member 1 and the upper seismic receiving member 2 toward each other has an upper and lower end provided on the base member 1 and the upper seismic receiving member 2 at positions outside the hook fitting 17 and the locking piece 18. In addition to locking to the stop hole portion, a lower large-diameter cylindrical skirt 19 in which the spring 7 is accommodated is provided at the locking portion of each spring 7 on the lower surface of the upper seismic receiving member 2 and is deformed when rolling occurs. The spring 7 is held by a skirt 19.

  In the case of FIG. 1, the base member 1 has a shape in which the base plate 8 protrudes in four directions so as to be arranged at a portion where the foundation B intersects. What is necessary is just to form in the planar shape corresponding to a part.

  The seismic isolation device of the present invention has the above-described configuration, and a necessary number of planes are arranged between the foundation B and the base C in a wooden building or a low-rise concrete building.

  In the seismic isolation device, the base member 1 is fixed on the foundation B by fastening bolts or the like, and the upper seismic receiving member 2 is fixed on the bottom surface of the base C directly above the base member 1 by fastening bolts or the like. The steel ball 5 is disposed on the one dish surface 9, the sleeve 3 held by the cylindrical portion 14 of the upper seismic receiving member 2 is placed on the steel ball 5, and the hook fitting 17 is engaged with the locking piece 18. At the same time, the base member 1 and the upper seismic receiving member 2 are coupled by the spring 7.

  FIG. 2 shows a normal state of the seismic isolation device, in which the steel ball 5 fits in the recess 12 of the dish surface 9 and the elastic body 4 is compressed by the weight of the building A when stationary, The spring 7 pulls the base member 1 and the upper seismic receiving member 2 together, and the hook metal fitting 17 engages with the locking piece 18 so that the base member 1 and the upper seismic receiving member 2 are coupled vertically. The building A at the time is stably fixed and supported on the foundation B so that it does not shake even under strong winds.

  FIG. 3 shows the absorption state of the pitching at the time of the earthquake occurrence. The rising wave P transmitted from the ground to the foundation B is transmitted from the foundation B to the base member 1, the steel ball 5 and the sleeve 3, and the rise of the sleeve 3 is elastically elastic. By absorbing the compression of the body 4, the vertical movement of the building A is slowed down.

  When the elastic member 4 is compressed and the base member 1, the steel ball 5 and the sleeve 3 are raised, the distance between the base member 1 and the upper seismic receiving member 2 approaches and the hook metal 17 is engaged with the locking piece 18. The hook is released, the hook metal member 17 is automatically tilted outward, the engagement with the locking piece 18 is released, and the upper and lower couplings of the base member 1 and the upper seismic receiving member 2 are released.

  FIG. 4 shows the state of absorption of rolls that occur following the pitching in the event of an earthquake. When the foundation and the base member fixed to it are rolled by the rolling waves S, they are held by the sleeve 3 on the building A side. Since the steel ball 5 tries to maintain the initial position, the base member 1 moves sideways with respect to the steel ball 5 to release the roll, thereby slowing the roll of the building A.

  Although the roll of the earthquake does not matter in the direction, the plate surface 9 of the base member 1 is formed in a circular shape, and the steel ball 5 rises along the roll direction on the plate surface 9 having a rising gradient simultaneously with the roll, The spring 7 that can cope with rolls in all directions and connects the base member 1 and the upper receiving member 2 in a tension state also tries to return the base member 1 and the upper receiving member 2 to the opposite positions. Rolling is suppressed by elasticity.

  In this way, the initial pitching due to the occurrence of the earthquake is absorbed by the contraction of the elastic body 4, and then the rolling is absorbed by the phase shift between the dish surface 9 of the base member 1 and the steel ball 5, thereby causing the earthquake. Building A can be protected from vibrations.

  If the vibration of the earthquake is settled, the steel ball 5 moves along the inclination of the dish surface 9 and fits in the concave portion 12 at the center portion. After that, if the hook fitting 17 is engaged with the locking piece 18, the initial stage It will return to the state of.

  Note that the vertical distance between the base member 1 and the upper seismic receiving member 2 is omitted during the initial mounting and after the earthquake, but the upper seismic receiving member for the base B and the base C 1 mounting portion is omitted. It is only necessary to adopt a screw mechanism for the two attachment portions and adjust the vertical distance by this screw mechanism.

  Although not shown in the drawings, the screws that fasten the upper and lower base members 1 and the upper seismic receiving member 2 against the anti-compression force of the elastic body 4 using the disc spring at the beginning of the base member 1 and the upper seismic receiving member 2. As a result, the hook metal fitting 17 is applied. The same applies to restoration after an earthquake.

Exploded perspective view showing the seismic isolation device of the present invention Normal longitudinal front view of the seismic isolation device of the present invention in use Longitudinal front view of the seismic isolation device of the present invention at the time of longitudinal vibration absorption in use Longitudinal front view at the time of rolling absorption in use showing the seismic isolation device of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base member 2 Upper seismic receiving member 3 Sleeve 4 Elastic body 5 Steel ball 6 Latch mechanism 7 Spring 8 Base plate 9 Dish surface 10 Dish plate portion 11 Perimeter wall 12 Recess 13 Plate 14 Cylindrical portion 15 Recess 16 Bracket 17 Hook fitting 18 Engagement Stop piece 19 Skirt A Building B Foundation C Foundation

Claims (2)

  A seismic isolation device that is placed between the foundation and foundation of the building and absorbs the vertical movement and roll of the building. The dish surface is inclined downward toward the center on the upper surface of the base member fixed on the foundation. An upper seismic member that is fixed to the base in a state of being opposed to the base member, and holds a sleeve that can move up and down, and an elastic body that is contracted between the sleeve and the upper seismic member, A plurality of latch mechanisms for mounting the sleeve on a steel ball arranged to be able to roll on the dish surface of the base member, and for vertically coupling the base member and the upper seismic receiving member so as to be able to be engaged and disengaged. And a base isolation device that combines the base member and the upper receiving member with a plurality of springs that draw each other.   A concave portion in which a steel ball is stably stored is formed in the central portion of the dish surface provided on the upper surface of the base member, and the latch mechanism is provided with an engagement piece provided on the upper seismic receiving member side, and the engagement piece. It is formed with a hook metal fitting pivoted on the base member side so that it can be freely engaged and disengaged. When the base member and the upper seismic receiving member come closer than the set interval, the hook metal piece is automatically detached from the locking piece. The seismic isolation device according to claim 1.

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