JP4250539B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device for isolating vibrations in a vertical direction and a horizontal direction of a structure.

  2. Description of the Related Art Conventionally, a structure including a seismic isolation device in a structure is known in order to prevent collapse of a structure such as a building due to an earthquake. As these seismic isolation devices, for example, there are devices using laminated rubber in which rubber sheets and steel plates are alternately stacked and bonded, or a damper. Laminated rubber is provided between the building and the foundation of the building. This laminated rubber prevents the vibration of the foundation from being directly transmitted to the building by bending when vibration in the horizontal direction is applied. Further, the damper can absorb and weaken vibration from one direction.

  In addition, there is a device that can isolate vibrations in the vertical direction and the horizontal direction by combining these dampers and laminated rubber (for example, Patent Document 1). Patent Document 1 discloses an elastic support body in which a long spring coil is further spirally wound between a structure and a foundation ground, and the elastic support body is embedded in a synthetic rubber in a lying state. In addition, a seismic isolation device is shown that is provided with a coil spring that connects the structure and the foundation ground around the elastic support. In the seismic isolation device described in Patent Document 1, when vibration energy at the time of an earthquake is applied, the elastic support body is deformed to absorb the vibration energy. And this seismic isolation apparatus uses the friction between the coiled spring body embedded in the synthetic rubber and the synthetic rubber to disperse the vibration energy and attenuate the vibration of the earthquake.

Japanese Examined Patent Publication No. 5-16516 (pages 2 to 3 and FIG. 2)

  However, in the seismic isolation device using only laminated rubber, the vertical deformation can be suppressed for the load in the vertical direction because the steel plate restrains the synthetic rubber from shrinking. On the other hand, since it is very soft and greatly deforms, there is a possibility that the gap between the building and the ground becomes too large and the laminated rubber and the seismic isolation device are damaged. Therefore, it is necessary to separately provide an elastic member such as a damper for a load in the horizontal direction.

  In addition, in a seismic isolation device using only a damper, vibration energy can be absorbed and attenuated with respect to vibration from one direction, but vibration energy is absorbed with respect to vibration from another direction. I can't. Therefore, in order to absorb vibration energy from multiple directions, it is necessary to increase the number of dampers to be installed, which increases the cost.

  Further, when an elastic support as in Patent Document 1 is used, the work of forming the wound spring body and the work of embedding the wound spring body in a synthetic rubber are complicated. Since a coil spring that supports the load in the direction is required separately, the number of parts increases and the cost also increases.

  An object of this invention is to provide the seismic isolation apparatus which can buffer the load of a horizontal direction and a perpendicular direction easily.

The seismic isolation device of the present invention is a seismic isolation device that is provided between the first structure and the second structure arranged side by side, and that is isolated from vibrations in the vertical and horizontal directions, A surface of the first structure facing the second structure is provided with a first plate having a first projecting portion with an end projecting toward the second structure, and the first structure has the first plate. A second plate having a second projecting portion with an end projecting toward the first structure is provided on the surface facing the first structure, and between the first plate and the second plate , provided substantially horizontal to the coil spring axis extends, said coil spring is engaged with the first protruding portion of the one end portion first structure, the other end of the second structure the 2 It is latched by the protrusion part .

  According to this invention, the seismic isolation device includes the coil spring whose axial center extends in the horizontal direction between the first structure and the second structure. One end of the coil spring is locked to the first structure, and the other end is locked to the second structure. Thereby, when a force in the vertical direction is applied to the seismic isolation device, the annular portion of the coil spring is bent into a substantially elliptical shape, so that it can receive and absorb the force in the vertical direction. In addition, since one end of the coil spring is locked to the first structure and the other end is locked to the second structure, when a force in the horizontal direction is applied, the coil spring is axially centered. Can absorb and absorb horizontal force by expanding and contracting in the direction. Therefore, force can be easily absorbed in response to both vertical and horizontal loads, and even when large vibration energy is applied from both the vertical and horizontal directions, such as earthquakes, these vibration energies are applied. Can be absorbed to suppress the transmission of vibration to the building. In addition, the structure is simpler than the conventional seismic isolation device, and the number of parts can be reduced. Furthermore, maintenance can be easily performed by simply replacing the coil spring.

In the present invention, as described above, the first plate having the first projecting portion whose end projects toward the second structure on the surface of the first structure facing the second structure. A second plate having a second projecting portion with an end projecting toward the first structure is provided on a surface of the second structure facing the first structure, and the coil spring Is sandwiched between the first plate and the second plate, and both end portions of the coil spring are locked to the first projecting portion and the second projecting portion , respectively . Here, it is preferable that the protrusion part of the edge part of the 1st and 2nd plate is provided in the position substantially orthogonal to the axial direction of a coil spring.

  According to this invention, the 1st and 2nd plate has a protrusion part in the edge part substantially orthogonal to the axial center direction of a coil spring. Thereby, the edge part of a coil spring is latched to this protrusion part, and this coil spring can be clamped easily. Therefore, a complicated structure is not required and the coil spring can be easily installed. Further, since the load is distributed throughout the coil spring through the first and second plates, it is possible to prevent the load from being concentrated on one point of the coil spring and being damaged.

Moreover, in this invention, it is preferable that the said coil spring forms continuously the several helical part from which a coil diameter differs from one wire.
At this time, in the present invention, the spiral portion of the coil spring has a plurality of large-diameter spiral portions having a large coil diameter and a plurality of small-diameter spiral portions having a coil diameter smaller than those large-diameter spiral portions. Is preferred.

According to this invention, a plurality of spiral portions having different coil diameters, for example, a large-diameter spiral portion having a large coil diameter and a small-diameter spiral portion having a small coil diameter are formed continuously. Accordingly, the large-diameter spiral portion can be sandwiched between the first structure and the second structure and can receive the load in the vertical direction up to a predetermined load with respect to the load in the vertical direction. When the load exceeds that, the large-diameter spiral portion bends and both the large-diameter spiral portion and the small-diameter spiral portion are sandwiched between the first structure and the second structure, and both the large-diameter spiral portion and the small-diameter spiral portion. Can receive a vertical load. Therefore, even if a large load is applied, the coil spring is not damaged, and a vertical force can be received by the spiral portion having a small coil diameter. At this time, the spiral portion having a small coil diameter is difficult to bend with respect to a load in the vertical direction, and the durability is increased, so that a larger load can be absorbed.
In the present invention, the coil spring is not limited to the above, and a plurality of the coil springs are provided between the first plate and the second plate, and the plurality of coil springs are formed to have different coil diameters. Also good.

  Further, at this time, the coil spring is preferably formed by alternately arranging a plurality of spiral portions having different coil diameters.

  According to the present invention, since the plurality of spiral portions having different coil diameters are alternately arranged, for example, the ratio of arranging the large-diameter spiral portion and the small-diameter spiral portion differs depending on a part of the coil spring. In the whole coil spring, the large-diameter spiral portion and the small-diameter spiral portion are arranged at an equal ratio. Thereby, the coil spring can disperse | distribute the load applied to a perpendicular direction uniformly. Even when an excessive load is applied, the small-diameter spiral portions are arranged at a uniform ratio, so that the load can be uniformly dispersed and absorbed.

Moreover, in this invention, it is preferable to arrange | position the said some coil spring so that an axial center may cross | intersect.
When only one coil spring is used, a load from the axial direction of the coil spring can be received by expansion and contraction of the coil spring with respect to a horizontal load, but from a direction substantially orthogonal to the axial direction. The load becomes relatively weak. On the other hand, in this invention, the plurality of coil springs are arranged so that the axes intersect each other. Thus, even when a load is applied from a direction substantially orthogonal to the axis of one coil spring, the load from the horizontal direction can be received and absorbed by another coil spring intersecting the axis of the coil spring. Therefore, by arranging a plurality of coil springs so that their axes intersect, it is possible to handle loads from the vertical direction and loads from all horizontal directions.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
1 to 3 show a seismic isolation device according to a first embodiment. FIG. 1 is a longitudinal sectional view of a building to which the seismic isolation device according to the first embodiment is applied. FIG. 2 is a cross-sectional view of the seismic isolation device in FIG. FIG. 3A is a longitudinal sectional view of the seismic isolation device when cut along the axis of the coil spring. FIG. 3B is a front view when the coil spring of the seismic isolation device is viewed from the axial direction.

[Configuration of seismic isolation device]
1, 2, and 3, a building 10 includes a foundation ground 11 as a first structure and a floor base material 12 as a second structure, and includes a foundation ground 11 and a floor base material 12. Between them, a seismic isolation device 100 is provided. In addition, although the foundation ground 11 was illustrated as a 1st structure here and the floor base material 12 was illustrated as a 2nd structure, it does not restrict to this. For example, a first-floor ceiling part of a building may be used as the first structure, and a second-floor floor base part of the building may be used as the second structure. Moreover, as a building to which such a seismic isolation device 100 is attached, in addition to buildings, such as a house and a building, it can apply to all buildings, such as a bridge and an overpass.

  The foundation ground 11 is built directly on the ground. Therefore, the foundation ground 11 is directly transmitted with shaking due to an earthquake or the like. The floor base material 12 is provided above the foundation ground 11 with a space 15 having a predetermined interval therebetween. A reinforcing portion 13 is provided on the upper portion of the floor base material 12, and a column member 14 is provided on the upper portion of the reinforcing portion 13. The seismic isolation device 100 is provided between the foundation ground 11 and the floor base material 12 below the pillar member 14 and the reinforcing portion 13, and supports the load of a building built above the floor base material 12. ing.

  The seismic isolation device 100 includes a plurality of seismic isolation members 110, and the seismic isolation member 110 includes a first plate 111, a second plate 112, and a coil spring 120.

  The first plate 111 is attached to the foundation ground 11. The first plate 111 is made of a high strength material such as a steel plate. Moreover, the 1st plate 111 is formed in the substantially rectangular shape which has a longitudinal direction. Then, at both ends in the longitudinal direction of the first plate 111, that is, at both short sides of the first plate 111, protruding portions 111 </ b> A as protruding portions protruding toward the floor base material 12 are formed. Further, on both long sides parallel to the longitudinal direction of the first plate 111, a retaining portion 111B rising from the first plate 111 is formed to prevent the coil spring 120 from falling off from the first plate 111. (See FIG. 2). Here, the configuration in which the retaining portion 111B is formed so as to rise from both long sides of the first plate 111 is illustrated, but the present invention is not limited to this. For example, the retaining portion 111B is provided on both the first plates 111. The groove part formed along a long side may be sufficient.

  The second plate 112 is attached to the floor base material 12. Similarly to the first plate 111, the second plate 112 is also formed of a high strength material such as a steel plate. In addition, the second plate 112 is formed in a substantially rectangular shape having a longitudinal direction, and as projecting portions that project toward the foundation ground 11 at both ends in the longitudinal direction, that is, both short sides of the second plate 112. 112A is formed. Further, similarly to the first plate 111, a retaining portion 112B is formed on both long sides (see FIG. 2).

  The coil spring 120 is formed by spirally winding a highly rigid material such as steel or stainless steel. FIG. 4 is a table showing an example of the maximum load of the coil spring 120 when the number of turns, the wire diameter, and the coil diameter of the coil spring 120 are changed.

  In FIG. 4, for example, when the number of turns of the coil spring 120 is increased, the strength against the load from the axial direction of the coil spring 120 is increased, and a larger load can be endured. On the other hand, when the number of turns is reduced, the strength against the load is weakened, but the seismic isolation action against the vibration is increased, so that transmission of vibrations such as earthquakes to the building 10 can be suppressed. Further, when the wire diameter of the coil spring 120 is increased or the coil diameter is decreased, the strength against the load in the vertical direction is increased. On the other hand, when the wire diameter of the coil spring 120 is reduced or the coil diameter is increased, the strength against the load in the vertical direction is weakened, but the seismic isolation action is increased, and transmission of vibrations such as earthquakes to the building 10 is achieved. Can be suppressed. Thus, the coil spring 120 preferably determines the number of turns, the wire diameter, and the coil diameter in consideration of the size and weight of the building 10. As shown in FIG. 2, the coil diameter of the coil spring 120 is set smaller than the length of the short sides of the first plate 111 and the second plate 112. Accordingly, the coil spring 120 can slide between the first plate 111 and the retaining portions 111B and 112B of the second plate 112 in a direction substantially orthogonal to the axial direction of the coil spring 120.

  The coil spring 120 is sandwiched between the first plate 111 and the second plate 112 in a state where the leading end is locked to the protruding portions 111A and 112A of the first plate 111 and the second plate 112. .

  As shown in FIG. 2, the seismic isolation members 110 are arranged such that the axial centers of the coil springs 120 are substantially orthogonal to each other. In addition, although illustrated here having arrange | positioned so that the seismic isolation member 110 may mutually be substantially orthogonal, it does not restrict to this. That is, these seismic isolation members 110 should just be arrange | positioned in the direction which mutually cross | intersects. In addition, FIG. 2 shows the seismic isolation device 100 for a part where the column member 14 is erected. The seismic isolation device 100 may be provided by arranging the seismic member 110.

[Operation of the seismic isolation device]
Next, operation | movement of the seismic isolation apparatus 100 when such a seismic isolation apparatus 100 receives a load from a perpendicular direction and a horizontal direction is demonstrated.

  The seismic isolation device 100 receives a load from a predetermined direction by receiving the earthquake energy of the earthquake. Further, the building 10 itself receives a vertical load due to its own weight. Arrows P1, P2, P3, P4, P5, and P6 shown in FIGS. 2 and 3 are loads that the seismic isolation member 110 receives.

  The load P1 is a load that the seismic isolation member 110 receives from the vertical upper side to the vertical lower side, and the load P2 is a load that is received from the vertical lower side to the vertical upper side. The load P1 is a load that is always applied mainly by the weight of the building 10. On the other hand, the load P2 is a load applied by a pitching due to an earthquake or the like. When such loads P1 and P2 are applied, the coil spring 120 of the seismic isolation member 110 receives the load by bending in the vertical direction. When an excessive load P <b> 2 is applied due to an earthquake or the like, the coil spring 120 bends up and down and expands and contracts to suppress transmission of earthquake vibration to the building 10.

  The load P3 is a load in the axial direction of the coil spring 120. When receiving the load P3 due to the earthquake, the seismic isolation member 110 expands and contracts the coil spring 120 in the axial direction to receive the load P3, and suppresses transmission of vibration to the building 10.

  Loads P4, P5, and P6 shown in FIG. 2 are loads applied from arbitrary directions due to an earthquake or the like. When receiving the loads P4 and P5 due to the earthquake, the one seismic isolation member 110 can receive the loads P4 and P5 by expanding and contracting the coil spring 120 in the axial direction. The other seismic isolation member 110 receives loads P4 and P5 from a direction substantially orthogonal to the axial direction. In this case, since the first plate 111 and the second plate 112 are formed larger than the coil diameter of the coil spring 120, the other coil spring 120 is in a direction perpendicular to the axis and in the direction of one axis. It is deflected by the expansion / contraction dimension, and is not affected by the loads P4 and P5.

  Further, for a force applied in an oblique direction with respect to the axial direction like the load P6, the load P6 is decomposed into the axial direction of each coil spring 120 and the direction orthogonal to the axial center, A load in the same direction is received by the expansion and contraction of the coil spring 120. The load in the direction orthogonal to the axis is received by the expansion and contraction of the coil spring 120 of the other seismic isolation member 110.

  In this way, the seismic isolation device 100 can receive loads from all directions in the vertical direction and the horizontal direction.

[Effect of the first embodiment]
When the seismic isolation device 100 as described above is used, the following effects can be obtained.
(1) The seismic isolation device 100 includes a coil spring 120 having an axial center extending in the horizontal direction between the foundation ground 11 and the floor base material 12. Then, both end portions of the coil spring 120 are engaged with the protruding portion 111A of the first plate attached to the foundation ground 11 and the protruding portion 112A of the second plate 112 attached to the floor base material 12. Thereby, when a force in the vertical direction is applied to the seismic isolation device 100, the annular portion of the coil spring 120 is bent in the vertical direction, so that the force in the vertical direction can be received and absorbed. Further, when a force in the horizontal direction is applied, the coil spring 120 expands and contracts in the axial direction and can receive and absorb the force in the horizontal direction. Therefore, it is possible to easily absorb the load corresponding to the load from the vertical direction and the horizontal direction, so even when large vibration energy is applied from both the vertical direction and the horizontal direction such as an earthquake. Vibration energy can be absorbed, and transmission of vibration to the building 10 can be suppressed. Moreover, compared with the conventional seismic isolation apparatus, the structure is simple and the number of parts can be reduced. Furthermore, maintenance work can be easily performed only by replacing the coil spring.

  (2) The first plate 111 and the second plate 112 have protrusions 111 </ b> A and 112 </ b> A at ends that are substantially orthogonal to the axial direction of the coil spring 120. Thereby, the edge part of the coil spring 120 can be latched by these protrusion parts 111A and 112A, and this coil spring 120 can be clamped easily. Therefore, a complicated structure is unnecessary and the coil spring 120 can be easily installed. Further, since the load is distributed throughout the coil spring through the first plate 111 and the second plate 112, it is possible to prevent the load from being concentrated on one point of the coil spring 120 and damaging the coil spring 120.

  (3) The two coil springs 120 are arranged so that the axes are substantially orthogonal to each other. As a result, even when a load is applied from a direction substantially perpendicular to the axis of one coil spring 120, the other coil spring 120 intersecting the axis receives the load from the horizontal direction. Can absorb. Therefore, by arranging the two coil springs 120 so that the axes intersect, these loads can be easily absorbed in response to loads from all directions in the horizontal direction.

  (4) The coil diameter of the coil spring 120 is set to be smaller than the length of the short sides of the first plate 111 and the second plate 112, and the coil spring 120 is not extended to both long sides of the first plate 111 and the second plate 112. Stop portions 111B and 112B are formed. Thereby, even if the load substantially orthogonal to the axis of the coil spring 120 is applied to the seismic isolation member 110, the coil spring 120 can move and escape in a direction substantially orthogonal to the axis. Therefore, even if a load substantially orthogonal to the axis of the coil spring 120 is applied, the coil spring 120 can be prevented from being damaged. Moreover, since the load orthogonal to the axial center of the coil spring 120 can be received by the other coil spring 120 provided so that the axial center direction of the coil spring 120 is substantially orthogonal, to the building 10. The transmission of vibration can be suppressed.

  (5) Since the coil spring 120 is formed by spirally winding a rigid material a plurality of times, for example, even if one of them breaks, the stress for one turn of the broken portion falls, The stress with respect to the load of the part which is not fractured can be maintained. Therefore, even if an excessive load is applied due to an earthquake or the like and one portion of the coil spring 120 is broken, the seismic isolation function can be sufficiently maintained.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5A is a schematic diagram of a longitudinal section when the seismic isolation member 110 of the second embodiment is cut along the axis. FIG. 5B is a front view of the seismic isolation member 110 when viewed from the axial direction. FIG. 6 is a graph showing the deflection of the coil spring with respect to the load from the vertical direction. In the second embodiment, the shape of the coil spring 120 according to the first embodiment is modified. Therefore, the same constituent elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. .

[Configuration of seismic isolation device]
In FIG. 5, in the seismic isolation member 110 </ b> B of the second embodiment, the coil spring 130 is formed of a single wire, and a large-diameter spiral portion 130 </ b> A having a large coil diameter and a small-diameter spiral portion 130 </ b> B having a small coil diameter. It is formed alternately and continuously. As the material of the coil spring 130, a material having a high strength and durability, such as a steel bar, is selected as in the case of the coil spring 120 of the first embodiment. And this coil spring 130 is clamped between the 1st plate 111 and the 2nd plate 112 in the state which both ends locked to protrusion part 111A, 112A of the 1st plate 111 and the 2nd plate 112. . At this time, the large-diameter spiral portion 130A of the coil spring 130 contacts the first plate 111 and the second plate 112 and receives a load in the vertical direction. On the other hand, the small diameter spiral portion 130B is not in contact with the second plate 112 because the coil diameter is smaller than that of the large diameter spiral portion 130A.

[Operation of the seismic isolation device]
When a vertical load is applied to such a seismic isolation member 110, the large-diameter spiral portion 130A of the coil spring 130 bends in the vertical direction and absorbs the load. Further, when an excessive load is received due to an earthquake or the like and the large-diameter spiral portion 130A is further bent, the small-diameter spiral portion 130B having a smaller coil diameter than the large-diameter spiral portion 130A comes into contact with the first plate 111 and the second plate 112. . Since the small-diameter spiral portion 130B has a smaller coil diameter than the large-diameter spiral portion 130A, as shown in FIG. 4, the small-diameter spiral portion 130B has a greater strength against a load in the vertical direction. Therefore, a load in the vertical direction can be received by the large-diameter spiral portion 130A and the small-diameter spiral portion 130B having high strength. For this reason, by using such a coil spring 130, as shown in FIG. 6, the weight of the building 10 can be supported by the strength and durability of the large-diameter spiral portion 130A up to a predetermined load. If the deflection of the large-diameter spiral portion 130A increases beyond this predetermined load due to an earthquake or the like, that is, the load P7 is applied to the coil spring 130 in FIG. 6, and the large-diameter spiral portion 130A bends. When the deflection reaches δ7, both the large-diameter spiral portion 130A and the small-diameter spiral portion 130B can receive a load in the vertical direction with greater strength and durability.

[Effect of the seismic isolation device of the second embodiment]
In the seismic isolation device of the second embodiment, the following effects can be obtained in addition to the effects (1) to (5) of the first embodiment.
(6) The coil spring 130 is formed by continuously connecting a large-diameter spiral portion 130A having a large coil diameter and a small-diameter spiral portion 130B having a small coil diameter. Thus, the large-diameter spiral portion 130A can be sandwiched between the foundation ground 11 and the floor base material 12 and can receive the vertical load up to a predetermined load with respect to the vertical load. When the load exceeds that, the large-diameter spiral portion 130A bends and both the large-diameter spiral portion 130A and the small-diameter spiral portion 130B are sandwiched between the foundation ground 11 and the floor base material 12, and the large-diameter spiral portion 130A and the small-diameter spiral Both portions 130B can receive a load in the vertical direction. Therefore, even if a large load is applied, the small-diameter spiral portion 130B having a small coil diameter is difficult to bend with respect to a load in the vertical direction and has a large durability, and therefore can absorb a larger load.

  (7) Since the large-diameter spiral portion 130A and the small-diameter spiral portion 130B are alternately arranged, the large-diameter spiral portion 130A and the small-diameter spiral portion 130B are thereby formed at an equal ratio throughout the coil spring 130. And are arranged. Therefore, the coil spring 130 can uniformly distribute the load applied in the vertical direction. Even when an excessive load is applied, the small-diameter spiral portions 130B are arranged at a uniform rate, so that a large load can be uniformly dispersed and absorbed.

[Modification of Embodiment]
It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

  For example, in the first and second embodiments, the seismic isolation device 100 is provided between the foundation ground 11 and the floor base material 12, but is not limited thereto. For example, as described above, it may be provided between the first floor ceiling and the second floor base. In addition, as described above, any building such as a house, a building, a bridge, or an elevated can be targeted as a building to be installed.

  Moreover, in the 1st and 2nd embodiment, although the seismic isolation apparatus 100 is comprised by providing the two seismic isolation members 110 under the pillar member 14, it is not restricted to this. For example, the seismic isolation device 100 may be installed at a position where the column member 14 is not located above. Further, the number of seismic isolation members 110 is not limited to two, and more seismic isolation members 110 may be installed. In this way, by placing the seismic isolation members 110 in places where the column members 14 are not installed or increasing the number of seismic isolation members 110, it becomes possible to withstand even greater loads, and the seismic isolation effect. Will also improve.

  In the first and second embodiments, the plurality of coil springs 120 and 130 are arranged so that the axes intersect with each other. However, the present invention is not limited to this. For example, only one coil spring 120 or 130 may be installed, or the coil springs 120 and 130 may be installed so that their axial centers are parallel to each other. However, in this case, there is a risk of weakening against a load in a direction substantially orthogonal to the axis, so that the building 10 may be combined with other seismic isolation devices such as laminated rubber or the axis of the coil springs 120 and 130 may be combined. It is necessary to make it a structure that can only swing in the direction.

  In the second embodiment, the coil spring 130 has the large-diameter spiral portions 130A and the small-diameter spiral portions 130B arranged alternately, but the present invention is not limited to this. For example, the large-diameter spiral portion 130A may be biased on one end side of the coil spring 130, and the small-diameter spiral portion 130B may be biased on the other end side. In this case, it is possible to disperse the load in the vertical direction as a whole by changing a plurality of such coil springs in parallel and alternately changing the direction in which the large diameter spiral portions 130A and 130B are arranged.

  In the first and second embodiments, the coil springs 120 and 130 are sandwiched between the first plate 111 and the second plate, but are not limited thereto. For example, since the coil springs 120 and 130 are formed so that the shaft centers extend in the horizontal direction, the coil springs 120 and 130 are not directly affected even if there is unevenness in the installation location. 11 and the floor base material 12 may be disposed. With such a configuration, the number of parts can be reduced, and the cost for installing the seismic isolation device can be reduced.

  In the second embodiment, the coil spring 130 is configured by continuously forming the large-diameter spiral portion 130A and the small-diameter spiral portion 130B. However, the present invention is not limited to this. For example, a coil spring configured by continuously forming a large-diameter spiral portion, a small-diameter spiral portion, and a medium-diameter spiral portion having a coil diameter smaller than that of the large-diameter spiral portion and larger than that of the small-diameter spiral portion. There may be. In this way, by continuously forming the spiral portions having a plurality of coil diameters, the stress of the coil spring with respect to the load can be set in more detail, and an excellent seismic isolation effect can be obtained.

  Furthermore, in the second embodiment, the coil spring 130 is configured by continuously forming the large-diameter spiral portion 130A and the small-diameter spiral portion 130B. However, the coil spring 130 is not continuously formed. May be. For example, a coil spring having a large coil diameter and a coil spring having a small coil diameter may be separately prepared, and the coil spring having a small coil diameter may be inserted into the inner peripheral portion of the coil spring having a large coil diameter. In this case, since the number of coil turns of each of the coil spring having a large coil diameter and the coil spring having a small coil diameter is increased, the strength and durability can be increased.

  The present invention can be used not only for buildings such as houses and buildings but also for civil engineering buildings such as bridges and overpasses.

The longitudinal cross-sectional view of the building where the seismic isolation apparatus of 1st Embodiment is given. The cross-sectional view of the seismic isolation device in FIG. (A) The longitudinal cross-sectional view when a seismic isolation device is cut along the axial center of a coil spring. (B) Front view when the coil spring of the seismic isolation device is viewed from the axial direction. The figure which showed in tabular form an example of the maximum load of a coil spring when changing the number of turns of a coil spring, a wire diameter, and a coil diameter. (A) The schematic of the longitudinal cross-section when the coil spring of 2nd Embodiment is cut along an axial center. (B) Front view when the coil spring is viewed from the axial direction. The graph which showed the stress with respect to the load from the perpendicular direction of the coil spring of 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Foundation ground as 1st structure, 12 ... Floor base material as 2nd structure, 100 ... Seismic isolation apparatus, 111 ... 1st plate, 112 ... 2nd plate, 111A, 112A ... Projection part, 120, 130 coil springs, 130A, 130B ... spiral portions.

Claims (6)

A seismic isolation device that is provided between the first structure and the second structure that are arranged side by side to isolate vibrations in the vertical and horizontal directions,
A surface of the first structure facing the second structure is provided with a first plate having a first projecting portion with an end projecting toward the second structure,
A second plate having a second projecting portion with an end projecting toward the first structure is provided on a surface of the second structure facing the first structure,
A coil spring having an axial center extending in a substantially horizontal direction is provided between the first plate and the second plate ,
The coil spring is engaged with the first protruding portion of the one end portion the first structure, the other end portion is characterized by being engaged with the second protruding portion of the second structure Seismic isolation device. The seismic isolation device according to claim 1 ,
The said coil spring forms continuously the several helical part from which a coil diameter differs from one wire rod. The seismic isolation apparatus characterized by the above-mentioned. In the seismic isolation device according to claim 2,
The spiral portion of the coil spring includes a plurality of large-diameter spiral portions having a large coil diameter, and a plurality of small-diameter spiral portions having a coil diameter smaller than those of the large-diameter spiral portions.
This is a seismic isolation device. In the seismic isolation device according to claim 2 or claim 3 ,
The coil spring is formed by alternately arranging a plurality of spiral portions having different coil diameters. The seismic isolation device according to claim 1,
A plurality of the coil springs are provided between the first plate and the second plate, and the plurality of coil springs are formed to have different coil diameters.
  This is a seismic isolation device. In the seismic isolation apparatus according to any one of claims 1 to 5,
A seismic isolation device, characterized in that a plurality of the coil springs are arranged such that their axis intersects.

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