JP4735426B2 - Seismic isolation structure and seismic isolation method - Google Patents

Description

  The present invention relates to a seismic isolation structure and a seismic isolation method for a structure, and more particularly to a technique for alleviating a pulling force acting on a seismic isolation rubber.

  Conventionally, in order to reduce the shaking generated in structures such as buildings and condominiums during earthquakes, seismic isolation rubber has been installed between non-base-isolated structures (for example, the base) and base isolation objects. Structure is used. In general, the seismic isolation rubber used in such a seismic isolation structure is one in which rubber layers and steel plates are alternately laminated and bonded, and is strong against compressive force acting in the vertical direction, and in the horizontal direction. It has a flexible property to the shearing stress that acts on. Supporting the seismic isolation object by interposing such seismic isolation rubber between the non-isolation structure and the seismic isolation object, and suppressing the input of seismic force to the seismic isolation object during an earthquake Can do.

  By the way, when a large earthquake occurs in a structure having such a base-isolated structure, a phenomenon called rocking occurs in which the base-isolated object swings in addition to being displaced in the horizontal direction. Accordingly, a pulling force in the vertical direction may act in the seismic isolation rubber interposed between the non-base isolation structure and the base isolation object.

  However, since the seismic isolation rubber is weak against such a pulling force and may be damaged such as the adhesion between the rubber layer and the steel sheet being peeled off, the vertical pulling force acting on the seismic isolation rubber has been conventionally reduced. Seismic isolation structures have been proposed.

For example, in Patent Document 1, a guide member is provided below the lower flange plate of the seismic isolation rubber, and the guide member is accommodated in an opening provided on the basis, so that the guide member is made of the seismic isolation rubber. There is disclosed a seismic isolation structure that restrains horizontal movement and allows vertical movement. According to this seismic isolation structure, even if a pulling force is generated in the seismic isolation rubber, the guide member can be displaced vertically in the opening of the foundation, so that the seismic isolation rubber itself is not subjected to a pulling force.
JP 2003-194146 A

  However, in the seismic isolation structure described in Patent Document 1, the cost of parts increases because the guide member is attached to the lower side of the lower flange plate of the seismic isolation rubber, or the opening of the foundation that accommodates the guide member is installed. May take time and effort.

  This invention is made in view of said point, and it aims at providing the seismic isolation structure and seismic isolation method which can relieve | pulverize the extraction force which acts on a seismic isolation rubber with simple structure. .

In order to achieve the above object, the present invention is a seismic isolation structure that supports a base isolation object via a base isolation rubber in a non-base isolation structure,
A through hole is formed in either one of the upper and lower flange plates of the seismic isolation rubber, and a protruding member that is attached to the non-seismic isolation structure side or the seismic isolation object side through the through hole is provided .
A plurality of the projecting member and the through-hole penetrating the projecting member are provided so as to surround the seismic isolation rubber,
The protruding member is formed with a smaller dimension than the through hole so that a gap is formed between the protruding member and the through hole,
When the projecting member is attached to the non-seismic isolation structure side, the center position of the cross section of the projecting member is arranged eccentric to the seismic isolation rubber side than the center position of the cross section of the through hole,
When the projecting member is attached to the seismic isolation object side, the center position of the cross section of the projecting member is arranged eccentric to the opposite side of the seismic isolation rubber from the center position of the cross section of the through hole. (First invention).

According to the seismic isolation structure of the present invention, either the upper or lower flange plate of the seismic isolation rubber has a protruding member attached to the non-base isolation structure or the base isolation object side in a through-hole penetrating the flange plate. Since the pulling force is applied between the seismic isolation rubber and the non-isolated structure or seismic isolation object, the flange plate is not restrained and the seismic isolation structure or seismic isolation object Since it can be separated, the pulling force applied to the seismic isolation rubber can be reduced. For this reason, damage, such as peeling of the adhesion between the rubber layer of the seismic isolation rubber and the steel plate, can be prevented. On the other hand, the horizontal force acting on the seismic isolation object can be transmitted to the seismic isolation rubber as a shearing force by contacting the inner periphery of the through hole of the flange plate and the protruding member. Can be maintained.
In addition, since the horizontal shearing force acting between the base isolation rubber and the non-base isolation structure or the base isolation object due to vibration during an earthquake, etc. can be dispersed and transmitted by a plurality of protruding members, The shearing force applied to each protruding member can be reduced. For this reason, the shear strength of the protruding member can be reduced.
Further, when rocking occurs, the seismic isolation rubber is displaced in the horizontal direction, and the projecting member disposed in the direction in which the shearing force acts and the inner periphery of the through hole come into contact with each other, thereby reducing the horizontal shearing force. A projecting member that is in contact with a non-base isolation structure or a base isolation object while ensuring a gap between the projecting member and the through hole at a position facing the seismic isolation rubber while securely transmitting to the non-seismic isolation structure or seismic isolation object; With the contact position with the through hole as a fulcrum, the opposite position side of the flange plate can be reliably separated from the non-isolation structure or the isolation object.
Thereby, the seismic isolation performance by the seismic isolation rubber can be maintained, and the pulling force acting on the seismic isolation rubber can be effectively reduced. Furthermore, the force acting on the protruding member is mainly limited to the shearing force acting in the horizontal direction from the inner periphery of the through hole, and no axial force acts. That is, since no combined stress is generated in the protruding member, the design becomes easy.

  In addition, it is not necessary to attach a guide member to the lower side of the lower flange plate of the seismic isolation rubber, or to provide an opening for accommodating the guide member in the non-seismic isolation structure. It does not require time and effort.

  Moreover, according to the seismic isolation structure of the present invention, even when the seismic isolation rubber needs to be replaced, the protruding member attached to the non-base isolation structure or the base isolation target is removed, and the base isolation target is slightly jacked. The seismic isolation rubber can be pulled out in the horizontal direction and can be easily replaced.

  According to a second invention, in the first invention, the protruding member is detachably attached to the non-base isolation structure side or the base isolation object side.

  A third invention is characterized in that, in the first or second invention, a friction reducing material for reducing friction is interposed between the protruding member and the inner periphery of the through hole.

  According to the seismic isolation structure of the present invention, since the friction when the protruding member contacts the inner periphery of the through hole can be reduced, the pulling force acting on the seismic isolation rubber can be more effectively reduced, and the protruding member It is also possible to prevent wear due to friction between the through hole and the inner periphery of the through hole.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the projecting member has a flange plate in which the through hole is formed spaced apart from the non-base isolation structure or the base isolation target by a predetermined amount. In this case, it has an enlarged portion that comes into contact with the flange plate.
According to the seismic isolation structure of the present invention, it is ensured that the flange plate is detached from the projecting member by the separation displacement between the flange plate and the non-seismic isolation structure or the seismic isolation object exceeding the axial length of the projecting member. Can be prevented.

5th invention provided that the elastic body which urges | biases the flange plate of the said seismic isolation rubber toward the said non-seismic isolation structure or the said seismic isolation object in the invention in any one of 1-4. Features.
According to the seismic isolation structure of the present invention, the magnitude of the pulling force at which the flange plate and the non-seismic isolation structure or the seismic isolation object start to be separated can be adjusted by changing the elastic force of the elastic body.

According to a sixth invention, in any one of the first to fifth inventions, the projecting member is composed of an inner peripheral side bolt and an outer peripheral side washer, and the bolt is the non-base isolation structure or the base isolation base. It is attached to the object.

According to a seventh invention, in the sixth invention, the washer is divided into upper and lower members.

An eighth invention is a seismic isolation method for supporting a base isolation object via a base isolation rubber on a non-base isolation structure, wherein a through hole is formed in either one of the upper and lower flange plates of the base isolation rubber. The projecting member is attached through the through-hole on the non-base isolation structure side or the base isolation object side ,
A plurality of the projecting member and the through-hole penetrating the projecting member are provided so as to surround the seismic isolation rubber,
Forming the projecting member in a smaller dimension than the through hole so that a gap is formed between the projecting member and the through hole;
When attaching the projecting member to the non-seismic isolation structure side, the center position of the cross section of the projecting member is arranged eccentric to the seismic isolation rubber side than the center position of the cross section of the through hole,
When attaching the projecting member to the seismic isolation object side, the center position of the cross section of the projecting member is arranged eccentric to the opposite side of the seismic isolation rubber from the center position of the cross section of the through hole. It is characterized by.

  ADVANTAGE OF THE INVENTION According to this invention, the seismic isolation structure and seismic isolation method which can relieve | pulverize the extraction force which acts on a seismic isolation rubber with simple structure can be provided.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view showing a basic portion of a seismic isolation object 12 to which a seismic isolation structure 10 according to a first embodiment of the present invention is applied. FIG. 2 is an enlarged vertical cross-sectional view of the seismic isolation structure 10.

  As shown in FIG. 1, the seismic isolation structure 10 is configured by interposing a seismic isolation rubber 16 between the seismic isolation object 12 and the base portion 14. Therefore, in this embodiment, the base part 14 corresponds to the non-seismic isolation structure of the present invention. The seismic isolation rubber 16 includes a laminated rubber 16a formed by laminating a rubber layer and a steel plate, and an upper flange plate 16b and a lower flange plate 16c fixed above and below the laminated rubber 16a. It is fixed to the lower surface of the object 12. The lower flange plate 16c is placed on a base plate 14a fixed to the upper surface of the base portion 14.

  As shown in FIG. 2, the base plate 14a is, for example, a steel plate in which a plurality of stud bolts (not shown) are welded to the lower surface thereof, and these stud bolts are embedded in the foundation portion 14 made of concrete or the like. Thus, the base portion 14 is firmly fixed. In the base plate 14a, a plurality of screw holes 14b to be screwed with projecting members 18 described later are processed at predetermined positions.

  The lower flange plate 16c is provided with a through hole 19 that penetrates the upper and lower surfaces thereof. The protruding member 18 passes through the through hole 19.

  The projecting member 18 has a screw structure at its lower end so that it can be detachably fixed to the screw hole 14b. Worn. Further, the outer diameter of the body portion 18a of the protruding member 18 that is an insertion portion into the through hole 19 is formed smaller than the inner diameter of the through hole 19, while the outer diameter of the tip end portion 18b of the protruding member 18 is the through hole. It is formed larger than the inner diameter of 19. As a result, when a pulling force acts on the seismic isolation rubber 16 and the lower flange plate 16c is lifted upward, the lower flange plate 16c can be freely lifted upward without being restrained, and when a predetermined amount is lifted. The tip 18b abuts against the upper surface of the lower flange plate 16c, and further lifting is prevented. Further, a friction reducing material 20 is provided on the outer periphery of the body portion 18 a of the protruding member 18. Thereby, when the projection member 18 and the through-hole 19 contact, the contact friction is reduced. The friction reducing material 20 may be made of, for example, a low friction material such as Teflon (registered trademark), a low rigidity material such as rubber, or a mechanism (not shown) such as a ball bearing. Good. The friction reducing material 20 may be omitted.

  FIG. 3 is a plan view for explaining the arrangement of the protruding members 18 and the through holes 19 of the seismic isolation structure 10 shown in FIG. In addition, the difference in the size of the horizontal cross section of the protruding member 18 and the through hole 19 in FIG. 3 and the relationship between the installation positions are exaggerated from the actual one.

  As shown in FIG. 3, the lower flange plate 16c is formed in, for example, a disk shape, and the through hole 19 and the protruding member 18 that passes through the through hole 19 and is fixed to the base plate 14a are laminated rubber. A plurality are arranged so as to surround 16a. For example, in FIG. 3, eight sets of protruding members 18 and through holes 19 are arranged in a circular shape at equal intervals so as to surround the laminated rubber 16a.

  Further, the horizontal cross sections of the protrusion member 18 and the through hole 19 are circular, and the center position of the protrusion member 18 is arranged eccentrically to the laminated rubber 16 a side than the center position of the through hole 19.

  In the seismic isolation structure 10 described above, first, the base isolation rubber 16 including the lower flange plate 16c in which the through holes 19 are formed is placed on the base plate 14a of the base portion 14, and then penetrates from above the lower flange plate 16c. Construction is carried out by screwing the protruding member 18 through the hole 19 into the screw hole 14b of the base plate 14a. Further, when the seismic isolation rubber 16 needs to be replaced, the reverse procedure described above is taken, the protruding member 18 fixed to the base plate 14a is removed, and the seismic isolation object 12 is slightly jacked up. Pull out the seismic rubber 16 in the horizontal direction.

  FIG. 4 is a cross-sectional view showing the operation process of the seismic isolation structure 10 from the normal state to the occurrence of rocking, where (a) is a normal state, (b) is a state in which a horizontal displacement has occurred, and (c). These are figures which show the state which the seismic isolation rubber 16 produced by rocking | fluctuation.

  As shown in FIG. 4 (b), the lower flange plate 16c moves horizontally on the base plate 14a, and the outer periphery of the protruding member 18 (hereinafter referred to as the moving-destination protruding member 18F) disposed at the moved position. And an inner periphery of a through hole 19 (hereinafter referred to as a movement destination through hole 19F) penetrating through the movement destination projection member 18F abuts. Thereby, the horizontal seismic force can be transmitted between the seismic isolation rubber 16 and the base part 14. At this time, the center of the projecting member 18 (hereinafter referred to as an opposing projecting member 18R) that faces the destination projecting member 18F across the laminated rubber 16a is a through-hole 19 (hereinafter referred to as an opposing projecting member 18R). , The outer periphery of the opposing protrusion member 18R is in the state most spaced from the inner periphery of the opposing through hole 19R.

  When locking occurs from this state, as shown in FIG. 4 (c), the lower flange plate 16c on the side where the opposing through hole 19R is located has a contact point between the movement destination projection member 18F and the movement destination through hole 19F as a fulcrum. Float up. At this time, since the opposing projection member 18R and the opposing through hole 19R are not in contact with each other at a distance, no friction is generated therebetween, and no pulling force acts on the laminated rubber 16a. When the opposing through-hole 19R is lifted up until it comes into contact with the tip 18b of the protruding member 18, further lifting is prevented.

  The seismic isolation structure 10 may be provided with an elastic body such as a disc spring that urges the lower flange plate 16 c toward the base portion 14. FIG. 5 is an enlarged vertical sectional view showing an example in which a disc spring 22 is provided in the seismic isolation structure 10 of FIG.

  As shown in FIG. 5, the disc spring 22 is mounted between the tip 18b of the protruding member 18 and the lower flange plate 16c. The disc spring 22 is configured such that its elastic coefficient is sufficiently smaller than the elastic coefficient of the seismic isolation rubber 16. The disc spring 22 has a force (that is, a lower portion) that presses the lower flange plate 16c of the seismic isolation rubber 16 against the base plate 14a by the amount of compressive deformation according to the degree of tightening of the protruding portion 18 into the screw hole 14b. The magnitude of the pulling force at which the flange plate 16c starts to float can be adjusted. The elastic body is not limited to the disc spring 22 and may be any elastic member such as a rubber member.

  According to the seismic isolation structure 10 according to the first embodiment described above, the following effects can be obtained.

  (1) Since the protruding member 18 fixed to the base portion 14 side is passed through the through hole 19 provided in the lower flange plate 16c of the seismic isolation rubber 16, a pulling force acts on the seismic isolation rubber 16 by locking. When the lower flange plate 16c is lifted from the base portion 14, the pulling force applied to the seismic isolation rubber 16 can be reduced. For this reason, damage, such as peeling of the adhesion between the rubber layer of the laminated rubber 16a and the steel plate, can be prevented. On the other hand, the horizontal force acting on the seismic isolation object 12 can be transmitted to the seismic isolation rubber 16 as a shearing force when the inner periphery of the through hole 19 of the lower flange plate 16c and the protruding member 18 come into contact with each other. The seismic isolation performance can be maintained.

  (2) Since the projecting member 18 is detachably attached by being screwed to the base plate 14a, the projecting member 18 is removed when the seismic isolation rubber 16 needs to be replaced. Since the seismic isolation rubber 16 can be pulled out in the horizontal direction by slightly jacking up 12, the seismic isolation rubber 16 can be easily replaced.

  (3) When the friction reducing material 20 for reducing the friction is interposed between the protruding member 18 and the inner periphery of the through hole 19, the friction during this period can be reduced, so that it acts on the seismic isolation rubber 16. The pulling force can be reduced more effectively, and wear due to friction between the protruding member 18 and the inner periphery of the through hole 19 can be prevented.

  (4) By providing a plurality of projecting members 18 and through holes 19 penetrating the projecting members 18 so as to surround the seismic isolation rubber 16, the seismic isolation rubber 16 and the base portion 14 are separated by vibration during an earthquake or the like. Since the horizontal shearing force acting between them can be distributed and transmitted by the plurality of projecting members 18, the shearing force applied to each projecting member 18 can be reduced. For this reason, the shear strength of the projection member 18 can be reduced.

  (5) The projecting member 18 is formed so that a gap is formed between the projecting member 18 and the through hole 19 of the lower flange plate 16 c, and the center position of the cross section of the projecting member 18 is isolated from the center position of the cross section of the through hole 19. By being arranged eccentrically on the rubber 16 side, when locking occurs as shown in FIG. 4 (c), the destination protrusion member 18F and the inner periphery of the destination through hole 19F come into contact with each other in the horizontal direction. While the shearing force is reliably transmitted to the base plate 14a, the lower flange plate 16c can be reliably lifted by ensuring a gap between the opposing protruding member 18R and the opposing through hole 19R. Thereby, while being able to maintain the seismic isolation performance by the seismic isolation rubber 16, it can prevent more reliably that drawing force acts on the laminated rubber 16a.

  (6) The force acting on the protruding member 18 is mainly limited to the shearing force acting in the horizontal direction from the inner periphery of the through hole 19, and no axial force acts. That is, since no combined stress is generated in the seismic isolation rubber 16, its design is facilitated.

  (7) The tip 18b of the protruding member 18 is formed so that its outer diameter is larger than the inner diameter of the through-hole 19, so that when the lower flange plate 16c is lifted from the base portion 14 by a predetermined amount, the lower flange plate 16c. Since it abuts against the upper surface and prevents further lifting, it is possible to reliably prevent the lower flange plate 16c from coming off the protruding member 18.

  (8) When the disc spring 22 for biasing the lower flange plate 16c toward the base portion 14 is provided in the seismic isolation structure 10, the lower flange plate 16c starts to rise by adjusting the elastic force of the disc spring 22 The magnitude of the pulling force can be adjusted. Further, when the floating displacement increases, the impact when the lower flange plate 16c hits the tip 18b of the protruding member 18 can be reduced. Further, it is possible to alleviate the impact when the raised lower flange plate 16c returns to the base plate 14a.

  In the seismic isolation structure 10, the lower end of the protruding member 18 has a screw structure so that the protruding member 18 can be detachably fixed to the screw hole 14b. However, the present invention is not limited to this, and the outer diameter of the protruding member 18 and the screw hole are not limited thereto. It is good also as a metal touch structure which processed the dimension of 14b to about the same level, and was made detachable by inserting or extracting. However, when the screw structure of the protruding member 18 is a metal structure, the disc spring 22 is not used.

  Moreover, the said embodiment is good also as the seismic isolation structure 100 which replaced with the projection member 18 of the seismic isolation structure 10, and provided the projection member 180 which consists of the washer 181 and the bolt 182 which are mentioned later. FIG. 6 is an enlarged vertical cross-sectional view of the seismic isolation structure 100. FIG. 7 is an enlarged vertical cross-sectional view showing a configuration in which the washer 181 of FIG.

  As shown in FIG. 6, the protruding member 180 includes an outer washer 181 and an inner peripheral bolt 182, and the washer 181 is inserted into the through hole 19 of the lower flange plate 16 c in the same manner as the protruding member 18. The outer diameter of the body portion 181 a that is the portion to be formed is formed smaller than the inner diameter of the through hole 19, and the outer diameter of the tip portion 181 b of the washer 181 is formed larger than the inner diameter of the through hole 19. On the other hand, the lower portion of the washer 181 is configured to fit into the fitting hole 14c of the base plate 14a, and the inner periphery of the through hole 19 and the washer 181 come into contact with each other, so that a horizontal shearing force is generated. It is ensured to be transmitted to the base plate 14a.

  The bolt 182 is embedded in advance in the base portion 14 through the through hole 19 provided at the center of the cylindrical shaft of the washer 181 from above the washer 181 in order to prevent the washer 181 from coming off upward. It is screwed to the sheath tube 30 and fixed to the base portion 14 together with the washer 181. A disc spring 22 is mounted between the tip 181b of the washer 181 and the lower flange plate 16c. The disc spring 22 may be omitted.

  Further, as shown in FIG. 7, the outer washer 181 constituting the protruding member 180 is divided into a lower dowel pin 183 and an upper head 184. For example, the dowel pin 183 is a rolled steel bar for building structure ( The dowel pin 183 and the head 184 may be made of different materials, such as SNR 490B), and the head 184 may be made of carbon steel for mechanical structure (S45C).

Next, a second embodiment of the present invention will be described.
In the second embodiment, the lower flange plate 16c is fixed to the base portion 14, and the seismic isolation object 12 can be lifted from the upper flange plate 16b. FIG. 8 is an enlarged vertical cross-sectional view of the seismic isolation structure 200 according to the second embodiment, and FIG. 9 is a plan view for explaining the arrangement of the protruding members 18 and the through holes 19 of the seismic isolation structure 200. .

  In this embodiment, as shown in FIG. 8, a through hole 19 is provided in the upper flange plate 16b of the seismic isolation rubber 16, and the protruding member 18 is passed through the through hole 19 of the upper flange plate 16b from below. The base plate 12a fixed to the bottom of the seismic isolation object 12 is detachably fixed.

  However, the arrangement relationship between the through hole 19 and the protruding member 18 of the upper flange plate 16b is different from that of the seismic isolation structure 10, and the center position of the cross section of the protruding member 18 is the through hole as shown in FIGS. It is eccentrically arranged on the side opposite to the laminated rubber 16 a from the center position of 19. Thereby, the seismic isolation object 12 moves or floats on the seismic isolation structure 10 at the time of an earthquake.

  10A and 10B are cross-sectional views showing the operation process of the seismic isolation structure 200 from the normal time to the occurrence of rocking, where FIG. 10A is a normal state, FIG. 10B is a state in which a horizontal displacement has occurred, and FIG. These are figures which show the state which the lower surface of the seismic isolation object 12 produced by rocking.

  Comparing the operations of FIG. 4B and FIG. 10B in a state where the displacement in the horizontal direction has occurred, in FIG. 4B, in FIG. The contact position with the destination through-hole 19F is on the side of the laminated rubber 16a in the inner periphery of the destination through-hole 19F, whereas in FIG. 10B, it is on the side opposite to the laminated rubber 16a. In this embodiment, since the eccentric directions of the protruding member 18 and the through hole 19 are opposite to those in the first embodiment, the center of the opposing protruding member 18R at this time is as shown in FIG. Since it moves toward the center of the opposed through hole 19R, the opposed projecting member 18R and the inner circumference of the opposed through hole 19R are in the most spaced state as in FIG. 4B.

  Further, when locking occurs in this state, as shown in FIG. 10 (c), the movement-destination projection member 18F comes into contact with the inner periphery of the movement-destination through hole 19F to reliably transmit the horizontal shearing force. On the other hand, it is possible to secure the gap between the opposing protrusion member 18R and the opposing through-hole 19R, and to reliably lift the seismic isolation object 12 with the contact position as a fulcrum.

  Further, even if the tip 18b of the projection member 18 is displaced until it comes into contact with the upper flange plate 16b due to the lifting, the upper flange plate 16b prevents further lifting, so that the opposing projection member 18R is opposed to the opposing through hole 19R. It can be surely prevented from coming off from.

  Also in the second embodiment described above, the same effects as the above (1) to (8) of the first embodiment can be obtained.

  The seismic isolation structure 200 according to the second embodiment may be configured such that the disc spring 22 described in the first embodiment is mounted between the distal end portion 18b of the protruding member 18 and the upper flange plate 16b. Moreover, it is good also as a structure which installs the sheath pipe | tube 30 in the seismic isolation object 12 instead of the projection member 18, and fixes the projection member 180 to the sheath pipe | tube 30. FIG.

  Moreover, according to 1st and 2nd embodiment which concerns on this embodiment, it was set as the structure which interposes the base isolation structure 10, 100, or 200 between the base part 14 and the base isolation object 12, It is good also as a structure interposed in the intermediate part of the upper and lower layers of a structure. In this case, the upper layer is a seismic isolation object from the position where the seismic isolation structure 10, 100 or 200 is provided, and the lower layer is a non-seismic isolation structure.

It is a front view which shows the basic part of the seismic isolation object 12 to which the seismic isolation structure 10 which concerns on 1st embodiment of this invention is applied. It is a vertical cross-sectional enlarged view of the seismic isolation structure 10 which concerns on 1st embodiment. It is a top view for demonstrating arrangement | positioning of the projection member 18 and the through-hole 19 of the seismic isolation structure 10 shown in FIG. It is sectional drawing which shows the operation | movement process of the seismic isolation structure 10 based on 1st embodiment from a normal state to rocking | fluctuation generation | occurrence | production, (a) is a normal state, (b) is the state which the horizontal direction displacement produced (C) is a figure which shows the state which the seismic isolation rubber 16 produced by rocking. It is a vertical cross-sectional enlarged view which shows the example which provided the disc spring 22 in the seismic isolation structure 10 of FIG. It is a vertical cross-sectional enlarged view of the seismic isolation structure 100 which concerns on 1st embodiment. It is a vertical cross-sectional enlarged view which shows the structure which divided | segmented the washer 181 of FIG. 6 up and down. It is a vertical cross-sectional enlarged view of the seismic isolation structure 200 which concerns on 2nd embodiment. 4 is a plan view for explaining the arrangement of the protruding members 18 and the through holes 19 of the seismic isolation structure 200. FIG. It is sectional drawing which shows the operation | movement process of the seismic isolation structure 200 from the normal time to the time of rocking | fluctuation, (a) is a normal state, (b) is the state which the horizontal displacement produced, (c) is immunity by rocking. It is a figure which shows the state which produced the lower surface of the seismic object 12.

Explanation of symbols

10, 100, 200 Base-isolated structure 12 Base-isolated object 12a Base plate 14 Base portion 14a Base plate 14b Screw hole 14c Fitting hole 16 Base-isolated rubber 16a Laminated rubber 16b Upper flange plate 16c Lower flange plate 18 Projection member 18a Projection member Body 18b Projection member tip 18F Destination projection member 18R Opposing projection member 19 Through hole 19F Destination through hole 19R Opposing through hole 20 Friction reducing material 22 Belleville spring 180 Projection member 181 Washer 181a Washer body 181b Washer tip 182 Bolt 183 Dowel pin 184 Washer head

Claims (8)

A seismic isolation structure that supports a base isolation object via a base isolation rubber on a non-base isolation structure,
A through hole is formed in either one of the upper and lower flange plates of the seismic isolation rubber, and a protruding member that is attached to the non-seismic isolation structure side or the seismic isolation object side through the through hole is provided .
A plurality of the projecting member and the through-hole penetrating the projecting member are provided so as to surround the seismic isolation rubber,
The protruding member is formed with a smaller dimension than the through hole so that a gap is formed between the protruding member and the through hole,
When the projecting member is attached to the non-seismic isolation structure side, the center position of the cross section of the projecting member is arranged eccentric to the seismic isolation rubber side than the center position of the cross section of the through hole,
When the projecting member is attached to the seismic isolation object side, the center position of the cross section of the projecting member is arranged eccentric to the opposite side of the seismic isolation rubber from the center position of the cross section of the through hole. Seismic isolation structure characterized by that.   The seismic isolation structure according to claim 1, wherein the protruding member is detachably attached to the non-base isolation structure side or the base isolation object side.   The seismic isolation structure according to claim 1, wherein a friction reducing material for reducing friction is interposed between the protruding member and the inner periphery of the through hole. The protruding member has an enlarged portion that comes into contact with the flange plate when the flange plate in which the through hole is formed is separated from the non-base isolation structure or the base isolation object by a predetermined amount. The seismic isolation structure according to any one of claims 1 to 3 . The base isolation structure according to any one of claims 1 to 4 , further comprising an elastic body that biases the flange plate of the base isolation rubber toward the non-base isolation structure or the base isolation object. . It said projection member is constituted by the inner circumferential side of the bolt and the outer peripheral side of the washer, according to claim 1 to 5, wherein the bolt is characterized in that attached to the non-seismic isolation structure or the seismic isolation object The seismic isolation structure described in any of the above. The seismic isolation structure according to claim 6 , wherein the washer is divided into upper and lower members. A seismic isolation method for supporting a seismic isolation object via a seismic isolation rubber on a non-base isolation structure,
A through hole is formed in one of the upper and lower flange plates of the seismic isolation rubber, and a projecting member is attached through the through hole on the non-seismic isolation structure side or the seismic isolation object side ,
A plurality of the projecting member and the through-hole penetrating the projecting member are provided so as to surround the seismic isolation rubber,
Forming the projecting member in a smaller dimension than the through hole so that a gap is formed between the projecting member and the through hole;
When attaching the projecting member to the non-seismic isolation structure side, the center position of the cross section of the projecting member is arranged eccentric to the seismic isolation rubber side than the center position of the cross section of the through hole,
When attaching the projecting member to the seismic isolation object side, the center position of the cross section of the projecting member is arranged eccentric to the opposite side of the seismic isolation rubber from the center position of the cross section of the through hole. Seismic isolation method characterized by

Images