JP5968777B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device composed of upper and lower rods and a sliding body interposed therebetween.

  In Japan, an earthquake-prone country, there are various seismic resistances for various structures such as buildings, bridges, elevated roads, and detached houses. Technology, seismic isolation technology and seismic control technology have been developed and applied to various structures.

  In particular, seismic isolation technology is a technology that reduces the seismic force that enters the structure itself, so that the vibration of the structure during an earthquake is effectively reduced. In order to outline this seismic isolation technology, a base isolation device is interposed between the foundation and the upper structure, which is the lower structure, to reduce the transmission of the foundation vibration due to the earthquake to the upper structure. It reduces vibration and guarantees structural stability. In addition, this seismic isolation device is effective not only at the time of an earthquake but also in reducing the influence on the upper structure of traffic vibration that always acts on the structure.

  The general configuration of the seismic isolation device will be described. An upper surface and a lower surface having sliding surfaces having a curvature, and an upper surface and a lower surface having the same curvature in contact with each surface between the upper surface and the lower surface. And a vertical sliding type seismic isolation device, or a double concave type seismic isolation device.

  However, in this seismic isolation device, the operation performance of the upper and lower kites is governed by the coefficient of friction between the sliding body interposed between them and the friction force multiplied by the weight.

  Therefore, a seismic isolation device having a sliding body composed of two upper and lower divided bodies has been developed and applied generally. In this seismic isolation device, the friction coefficient of each divided body constituting the sliding body is made different, and further, the curvature of the sliding surface where both divided bodies are in contact with the upper and lower ridges is made different. Variations can be made in the operating performance, and for example, the merit that the operating range of the upper eyelid with respect to the lower eyelid can be made wider can be enjoyed.

  Patent Literature 1 discloses a seismic isolation device including a sliding body composed of the above-described two upper and lower divided bodies. This seismic isolation device is a sliding body having a convex spherical surface between a lower rod having a concave spherical surface and fixed to the lower structure, and an upper rod having a concave spherical seat and fixed to the upper structure. The sliding body includes an upper sliding member slidably contacting the upper collar, a lower sliding member slidably contacting the lower collar, and the upper sliding member provided between the upper sliding member and the lower sliding member. And a rubber integrally bonded to the moving member and the lower sliding member.

  Thus, the sliding body interposed between the lower rod and the upper rod is provided with the upper sliding member, the lower sliding member, and the upper sliding member and the lower sliding member. Since the elastic member absorbs the energy of the horizontal force of the earthquake and the excessive horizontal force is suddenly applied to the superstructure before the sliding body starts to slide. It can be prevented. Furthermore, it can be integrated in a low and compact form as a composite bearing consisting of a sliding bearing and an elastic bearing, and it is easy to attach and detach compared to conventional laminated rubber elastic bearings because it only requires a sliding body. Is also unnecessary.

  However, in this seismic isolation device, since the sliding body which is a constituent element interposes rubber, the sliding body contacts the upper sliding member and the lower sliding member due to insufficient surface pressure of the rubber. Distribution (bias) is likely to occur in the force acting on the surface (compression force, pressing force), and the movement of the sliding body is restricted by this bias in the acting force, resulting in smooth movement of the upper sliding member relative to the lower sliding member. There is a high possibility that the operation will be hindered.

  On the other hand, Non-Patent Document 1 discloses a seismic isolation device including a sliding body in which two upper and lower divided bodies are relatively rotatably connected via a rotating shaft.

  However, in this seismic isolation device, since the divided bodies constituting the sliding body are connected to each other via one rotating shaft extending in the horizontal direction, force is concentrated on the rotating shaft extending in the horizontal direction. Therefore, an extremely high-rigidity rotating shaft member must be applied.

  Furthermore, when the lower divided body does not move on the sliding surface of the lower rod for some reason, the upper divided body is connected to the lower divided body via the horizontal rotation shaft. The movement of the upper divided body is also restricted, and as a result, the movement of the upper eyelid relative to the lower eyelid is restricted. Note that this problem also exists in the technique of Patent Document 1 that discloses a sliding body in which upper and lower divided bodies are integrated with each other through rubber. When the lower divided body does not move, The movement of the divided body has to rely on the horizontal elongation of the rubber, and sufficient movement of the upper sliding member relative to the lower sliding member cannot be expected.

Japanese Patent Laid-Open No. 11-351325 Earthquake Engineering & Structural Dynamics 2006; Volume 35, Issue11 page1403-1424, “Behaviour of the double concave Friction Pendulum bearing”

  The present invention has been made in view of the above-described problems, and relates to a seismic isolation device having a sliding body composed of two or more divided bodies, and the movement of the upper eyelid relative to the lower eyelid due to the distribution of force in the sliding body. It is an object of the present invention to provide a seismic isolation device that can guarantee the smooth movement of the upper arm even when the sliding body cannot move with respect to the lower arm, without the problem of being restricted.

  In order to achieve the above object, the seismic isolation device according to the present invention is provided with an upper surface and a lower surface provided with a sliding surface having a curvature, and an upper surface having a curvature in contact with each surface between the upper surface and the lower surface. And a columnar sliding body having a lower surface, wherein the sliding body is composed of two upper and lower divided bodies, each of which has an inclined surface and is inclined. In contact with each other, there is a groove at the axial center of the inclined surface of each divided body, and the space defined by both concave grooves is relative to one divided body relative to the other divided body. A rotating shaft body that accommodates the rotation and prevents the relative shift of the axial centers of the two divided bodies is accommodated.

  The seismic isolation device (sliding seismic isolation device) according to the present invention is configured such that the sliding body interposed between the upper arm and the lower arm is composed of two divided bodies, and the two divided bodies have both the slopes. The surface is in surface contact with each other to form a columnar sliding body, and the split bodies are in surface contact with each other without rubber or the like, so that force distribution does not occur on the inclined surface. Further, even if the lower divided body stops moving on the lower arm, the inclined surface of the upper divided body rotates on the inclined surface of the lower divided body so that the upper surface of the sliding body has a gradient. The upper eyelid can be smoothly moved on the upper surface having this gradient. In addition, in this specification, “rotation” literally includes not only rotation of less than 360 degrees, for example, about 180 degrees, but also rotation of 360 degrees or more.

  In order to prevent the two split bodies from rotating relative to each other while being in surface contact with each other at the inclined surface, the axis of the other split body (rotation axis) with respect to one split body is prevented from shifting. A concave groove is provided at the axial center position of the inclined surface of the divided body, and the rotating shaft body is accommodated in a space defined by both concave grooves.

  Here, a thing of a form, such as a sphere and a cylinder, is applicable as a rotation axis.

  Further, each of the divided members constituting the upper collar, the lower collar, and the sliding body is made of, for example, steel, or the upper collar and the lower collar may be a laminated body of steel and stainless steel. In addition, in order to reduce the frictional force between the upper and lower ridges and the sliding body, appropriate surface treatment is applied to the upper and lower surfaces having the curvature of the sliding body and the sliding surfaces having the curvature of the upper and lower ridges, such as surface treatment by chrome plating. You may keep it.

  As another embodiment of the seismic isolation device, the sliding body is composed of three divided bodies in which a separate divided body is interposed between the upper and lower two divided bodies. An inclined surface is provided, and the upper divided body and the intermediate divided body are in surface contact with both inclined surfaces, and the intermediate divided body and the lower divided body are in surface contact with both inclined surfaces. There is a concave groove at the axial center of the inclined surface of the space defined by the concave groove of both the upper and lower divided bodies, and by the concave groove of both the intermediate and lower divided bodies. A form in which the rotating shaft body is accommodated in each of the spaces formed can be given.

  According to the sliding body constituting the seismic isolation device of the present embodiment, because it is composed of three divided bodies, for example, the intermediate divided body is rotated with respect to the lower divided body and inclined to the upper surface thereof. By rotating the upper divided body on the upper surface of the intermediate divided body having the inclination, the upper surface of the upper divided body can be given a steep gradient. Therefore, it becomes possible to move the upper eyelid more smoothly on the upper surface of the steep slope of the upper divided body. In addition, the form by which the sliding body was comprised from four or more division bodies may be sufficient. For example, in the form composed of four divided bodies, it is composed of four divided bodies in which two additional divided bodies are interposed between the upper and lower divided bodies, and each of the four divided bodies has an inclined surface, The divided body and the first intermediate divided body are in surface contact with both inclined surfaces, and the first intermediate divided body and the second intermediate divided body are in surface contact with both inclined surfaces, and the second The intermediate divided body and the lower divided body are in surface contact with each other on the inclined surfaces, and there is a concave groove at the axial center position of the inclined surface of each divided body. The space defined by the concave grooves on both the divided bodies, the space defined by the concave grooves on both the first and second intermediate divided bodies, and the concave grooves on both the second intermediate divided body and the lower divided body A configuration in which the rotating shaft bodies are accommodated in the spaces defined by the above can be mentioned.

  As can be understood from the above description, according to the seismic isolation device of the present invention, in the case where the sliding body interposed between the upper and lower collars provided in the seismic isolation device is composed of two or more divided bodies, The contact surface of the sliding body is an inclined surface, and the relative rotation is performed so as to prevent the two rotation axes from being displaced from each other. A uniform force can be applied to the upper and lower eyelids over the entire surface without causing a distribution in the force acting on the eyelids. Therefore, the movement of the divided body constituting the sliding body is not restricted by this bias of force, and as a result, the smooth movement of the upper eyelid with respect to the lower eyelid can be ensured. Further, even if the lower divided body stops moving on the lower arm, the inclined surface of the upper divided body rotates on the inclined surface of the lower divided body so that the upper surface of the sliding body has a gradient. The upper eyelid can be smoothly moved on the upper surface having this gradient.

It is a disassembled perspective view of embodiment of the seismic isolation apparatus of this invention. It is a longitudinal cross-sectional view of the assembled seismic isolation apparatus. (A) is the figure which showed the state before a seismic force acts with respect to the foundation and upper structure in which the seismic isolation device of this invention was integrated, (b) is a sliding body when seismic force acts. It is the figure which showed the state which has locked in the center position of the lower eyelid. (A), (b) is a longitudinal cross-sectional view of other embodiment of a sliding body.

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

(Embodiment of seismic isolation device)
FIG. 1 is an exploded perspective view of an embodiment of the seismic isolation device of the present invention, and FIG. 2 is a longitudinal sectional view of the assembled seismic isolation device.

  The seismic isolation device 10 shown in the figure includes a steel upper arm 1 having a sliding surface 1a having a curvature, a steel lower arm 2 having a sliding surface 2a having a similar curvature, Between the lower rods 2, the upper and lower rods 1 and 2 are in contact with the upper and lower surfaces 1 a and 2 a and have the same curvature as the upper and lower surfaces 4 b and 3 b, and are made of a steel columnar sliding body 6.

  The sliding body 6 is composed of two upper and lower divided bodies (an upper divided body 4 and a lower divided body 3). Both the divided bodies 3 and 4 are both inclined surfaces 3a passing through the axis L of the sliding body 6. , 4a, and are in surface contact with the respective inclined surfaces 3a, 4a.

  Hemispherical grooves 3a1 and 4a1 are formed on the axis L of the inclined surfaces 3a and 4a of the respective divided bodies 3 and 4, and the spherical shape defined by both hemispherical grooves 3a1 and 4a1. The rotating shaft body 5 made of a hard sphere is accommodated in the space K.

  On the axis L of the divided bodies 3 and 4, both are rotatably assembled via the rotating shaft body 5, and the upper divided body 4 is formed with respect to the lower divided body 3 by the rotating shaft body 5. When rotating (X direction in FIG. 2), the relative rotation of both can be ensured without shifting both axes.

  In the illustrated example, the curvatures of the sliding surface 1a of the upper rod 1 and the sliding surface 2a of the lower rod 2 are the same. Therefore, the upper surface 4b of the upper divided body 4 and the lower surface 3b of the lower divided body 3 are the same. The respective curvatures are the same as those of the sliding surfaces 1a and 2a, but the sliding surfaces 1a and 2a may have different curvatures, and in this case, they are complementary to the respective curvatures of the sliding surfaces 1a and 2a. The upper surface 4b and the lower surface 3b are provided with a specific curvature. Further, in the illustrated example, the upper rod 1 and the lower rod 2 are both made of steel, but they may be formed of different materials on the premise that they have a desired rigidity. When acting on the seismic device 10, the frictional force caused by the friction coefficient between the upper rod 1 and the upper divided body 4 and the friction force caused by the friction coefficient between the lower rod 2 and the lower divided body 3 are desired. Can be adjusted.

  Next, with reference to FIG. 3, the effect | action of this seismic isolation apparatus 10 when the seismic isolation apparatus 10 is integrated between a foundation and an upper structure is demonstrated. Here, FIG. 3a is a view showing a state before the seismic force is applied to the foundation and the upper structure in which the seismic isolation device is incorporated, and FIG. It is the figure which showed the state which has locked in the center position.

  Prior to the description of FIG. 3, in the seismic isolation device disclosed in Patent Document 1 and Non-Patent Document 1 described above (a configuration in which the sliding body is composed of two divided bodies), the foundation and the upper structure are earthquakes. Consider a case where the lower divided body constituting the sliding body is locked for some reason on the surface of the lower arm when a force is applied. When the movement of the lower rod is restricted in this way, the movement of the lower divided body and the upper divided body connected via the rubber or the rotating shaft extending in the horizontal direction is also restricted. Smooth movement is hindered. Therefore, it is difficult to reduce the seismic force acting on the foundation with the seismic isolation device and transmit the seismic force with the energy reduced to the upper structure as desired.

  Returning to FIG. 3, first, as shown in FIG. 3 a, in a state where the seismic isolation device 10 is attached between the base B (or lower structure) and the upper structure U, the sliding body 6 is divided into upper and lower parts. The surfaces 4a and 3a of the bodies 4 and 3 are in surface contact with each other (the inclination angle is θ). For this reason, of the own weight of the upper structure U, the shared load P shared by one seismic isolation device 10 acts on the entire inclined surfaces 4a and 3a, and the distribution of loads acting on the inclined surfaces (biased load). There is no. Accordingly, the upper divided body 4 can smoothly rotate on the inclined surface 3a of the lower divided body 3 with the rotation shaft body 5 as the rotation center.

  Next, as shown in FIG. 3 b, it is assumed that when the seismic force F acts on the foundation B, the lower divided body 3 constituting the sliding body 6 is locked on the sliding surface 2 a of the lower rod 2. .

  In the conventional seismic isolation device, as described above, the movement of the upper divided body is restricted by the lock of the lower divided body, and the seismic force with sufficiently reduced energy is transmitted to the upper structure by the seismic isolation device. It is not possible.

  On the other hand, according to the seismic isolation device 10 shown in the drawing, the inclined surface 4a of the upper divided body 4 rotates on the inclined surface 3a of the lower divided body 3 around the rotating shaft body 5, for example, 180 degrees. When rotated, the inclination angle of the upper surface 4b of the upper divided body 4 from the horizontal direction is 2θ.

  As described above, the inclination angle of the upper surface 4b of the divided body 4 from the horizontal direction is increased, so that the sliding surface 1a of the upper collar 1 is easy to move on the upper surface 4b (moving direction Y in the horizontal direction). As described above, the smooth movement of the upper collar 1 is promoted only by the rotation of the upper divided body 4 with respect to the lower divided body 3. As a result, the seismic force F acting on the foundation B can be sufficiently reduced by the seismic isolation device 10, and the seismic force after the energy is reduced as desired can be transmitted to the upper structure U.

(Other embodiment of sliding body)
4a and 4b are both longitudinal sectional views of other embodiments of the sliding body.

  In the sliding body 6A shown in FIG. 4a, the space Ka defined by the recessed grooves 4Aa1 and 3Aa1 formed in the inclined surfaces 4Aa and 3Aa of the upper divided body 4A and the lower divided body 3A has a cylindrical shape. The space Ka has a complementary shape, that is, a columnar shape and accommodates a rotating shaft body 5A made of steel. Note that the upper and lower eyelets (not shown) are in surface contact with the upper surface 4Ab and the lower surface 3Ab. The rotating shaft body 5A is incorporated so that the axis L ′ of the rotating shaft body 5A is perpendicular to the inclined surfaces 4Aa and 3Aa.

  Even when the illustrated sliding body 6A is applied to a seismic isolation device, the same effects as the sliding body 6 constituting the seismic isolation device 10 shown in FIGS.

  On the other hand, the sliding body 6B shown in FIG. 4b is composed of three divided bodies in which a separate intermediate divided body 7 is interposed between the upper divided body 4B and the lower divided body 3B.

  Each of the three divided bodies 4B, 3B, 7 includes inclined surfaces 4Ba, 3Ba, 7a, 7b passing through the axis L of the two sliding bodies 5, 5, and the upper divided body 4B and the intermediate divided body 7 are both The inclined surfaces 4Ba and 7a are in surface contact, and the intermediate divided body 7 and the lower divided body 3B are in surface contact with both inclined surfaces 7b and 3Ba. And there is a groove on the axis L of the inclined surface of each divided body 4B, 7, 3B, and the space defined by the recessed grooves 4Ba1, 7a1 of both the upper divided body 4B and the intermediate divided body 7, Rotating shaft bodies 5 made of steel balls are accommodated in the spaces defined by the grooves 7b and 3Ba1 in both the intermediate divided body 7 and the lower divided body 3B.

  According to the sliding body 6B composed of the three divided bodies 4B, 7 and 3B shown in the figure, the intermediate divided body 7 can be rotated with respect to the lower divided body 3B, and the upper surface 7a can be inclined. By rotating the upper divided body 4B on the upper surface 7a of the intermediate divided body 7 having this inclination, the upper surface 4Bb of the upper divided body 4B can be given a steeper gradient. Therefore, it is possible to move the upper eyelid (not shown) more smoothly on the steeply sloped upper surface 4Bb of the upper divided body 4B.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Upper rod, 1a ... Sliding surface, 2 ... Lower rod, 2a ... Sliding surface, 3, 3A, 3B ... Lower divided body, 3a, 3Aa, 3Ba ... Inclined surface, 3a1, 3Aa1, 3Ba1 ... Concave groove 3b: lower surface, 4, 4A, 4B ... upper divided body, 4a, 4Aa, 4Ba ... inclined surface, 4a1, 4Aa1, 4Ba1 ... concave groove, 4b ... upper surface, 5, 5A ... rotating shaft body, 6, 6A , 6B ... sliding body, 7 ... intermediate divided body, 10 ... seismic isolation device, L, L '... axis, K, Ka ... space, B ... foundation (lower structure), U ... upper structure, P ... Shared load, F ... seismic force

Claims (3)

Upper and lower eyelids with a sliding surface having a curvature;
A columnar sliding body having an upper surface and a lower surface that have a curvature in contact with each ridge between the upper ridge and the lower ridge,
The sliding body is composed of two upper and lower divided bodies, each of which has an inclined surface and is in surface contact with each inclined surface, and a groove is formed at the axial center position of the inclined surface of each divided body. There is a rotation that allows relative rotation of the other divided body relative to one divided body in a space defined by both concave grooves and prevents relative displacement of the axis of both divided bodies. A seismic isolation device that contains a moving shaft.   The seismic isolation device according to claim 1, wherein the rotating shaft body is formed of one of a spherical body and a cylindrical body. The sliding body is composed of three divided bodies in which another divided body is interposed between the upper and lower divided bodies,
Each of the three divided bodies has an inclined surface, the upper divided body and the intermediate divided body are in surface contact with both inclined surfaces, and the intermediate divided body and the lower divided body are in surface contact with both inclined surfaces. In addition, there is a groove at the axial center position of the inclined surface of each divided body, a space defined by the recessed grooves of both the upper divided body and the intermediate divided body, both the intermediate divided body and the lower divided body The seismic isolation device according to claim 1, wherein the rotating shaft body is accommodated in each of the spaces defined by the concave grooves.

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