JP4200660B2 - Seismic isolation structure dropout prevention device - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a seismic isolation structure for a structure or prevention of a bridge girder from falling off.
[0002]
[Prior art]
In order to suppress an excessive deformation due to an earthquake of a base-isolated structure, a displacement limiting device using a string-like body is known. Moreover, a falling bridge prevention device using a PC steel material, a PC cable, or the like is known.
[0003]
However, the space where the seismic isolation device is installed is limited in height and requires a space for installation. Further, when a PC steel material, a PC cable or the like is used, fixing of the end portion becomes complicated.
[0004]
[Problems to be solved by the invention]
The problem to be solved is that the drop-off prevention device cannot be compactly installed in a limited space. In addition, the fixing mechanism of PC steel materials is complicated, and corrosion may occur due to the intrusion of rainwater.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configuration. The invention of claim 1 (for example, FIGS. 1 and 3 to 7) is an invention that is interposed between the lower structure 3 and the upper structure 2 and supports the upper structure 2 so as to be movable in the horizontal direction. In the seismic isolation structure including the seismic support 1, at least one string-like body 21 that tensions and regulates the displacement of the structure when the upper structure 2 is displaced by a predetermined amount, and the upper structure 2 and the lower structure 3. and one one fixing means for fixing one end of the string-like body which is inserted in a substantially horizontal direction into unit with rotatably mounted only within a fixed or a horizontal plane 11-16 of, The other end of the string-like body 21 fixed to the other of the upper structure 2 and the lower structure 3 or attached rotatably only in a horizontal plane and inserted through the opening in a substantially horizontal direction is fixed. It has the other fixing means 11 to 16, At least one of the square of the fixing means 11 to 16 and the other fixing means 11 to 16 is provided with interpolation communication means 31,32,43 for inserting a string-like body 21, the string-like body 21 Is inserted between the lower structure 3 and the upper structure 2 in a substantially horizontal direction through at least one insertion means 31, 32, 43 of one fixing means 11-16 and the other fixing means 11-16. to form at least one closed loop, immune and the other end portion of the one end or the string-like body 21 of the string-like body 21 that is swingably connected to the lower structure 3 or superstructure 2 Isolation a falling-off prevention device of a structure.
[0006]
According to the dropout prevention device of the first aspect, in the seismic isolation structure, the lower structure side and the upper structure side are connected by the string-like body and the fixing means, and the displacement between the lower structure and the upper structure is fixed. Tension can be prevented when the fixed amount is reached, and the structure can be prevented from falling off. By using a high-strength fiber rope for the string-like body, it flexibly follows the deformation of the upper structure and does not corrode. Moreover, a large tensile load can be borne by connecting a plurality of string-like bodies.
[0007]
The invention of claim 2 (for example, FIGS. 9 to 10) is a seismic isolation bearing 1 that is interposed between the lower structure 3 and the upper structure 2 and supports the upper structure 2 movably in the horizontal direction. In the seismic isolation structure comprising: at least one string-like body 21 that is tensioned to regulate displacement of the structure when the upper structure 2 is displaced by a predetermined amount; and the upper structure 2 and the lower structure 3 One fixing means 17 having a cylindrical shape for fixing one end of a string-like body 21 that is embedded and fixed in one side and is inserted through the opening in a substantially vertical direction, and the upper structure 2 and the lower part The other fixing means 17 having a cylindrical shape for fixing the other end of the string-like body 21 that is embedded and fixed in the other of the structures 3 and is inserted through the opening in a substantially vertical direction. has, little of the one fixing unit 17 and the other fixing means 17 Least one A is provided with interpolation communication means 31,32,43 for inserting a string-like body 21, string-like body 21 is at least one of the one of the fixing means 17 and the other fixing means 17 at least one closed loop is formed, one end of the string-like body 21 or cord-like between the lower structure 3 is substantially inserted in the vertical direction into the insertion means 31,32,43 of the upper structure 2 the other end of the body 21 is a falling-off prevention device of seismic isolation structure that is swingably connected to the lower structure 3 or superstructure 2.
[0008]
According to the dropout prevention device of the second aspect, in the seismic isolation structure, the lower structure side and the upper structure side are connected to each other by the string-like body and the fixing means. Even when the support is damaged beyond the allowable value, the string-like body can be tensioned to prevent the structure from falling off. Further, by limiting the horizontal displacement between the lower structure and the upper structure to a predetermined amount, it is possible to prevent the seismic isolation bearing from being damaged. Since the fixing means has a cylindrical shape and is embedded in the upper and lower structures, a small pulling resistance can be obtained. By using a high-strength fiber rope for the string-like body, it flexibly follows the deformation of the upper structure and does not corrode. Moreover, a large tensile load can be borne by connecting a plurality of string-like bodies.
[0009]
According to the first aspect of the present invention , at least one insertion means 31, 32, 43 of the one fixing means 11-16 and the other fixing means 11-16 is the one fixing means 11-16 or the other fixing means. A curved portion 43 that gradually expands from the inside of 11 to 16 toward the opening, and is provided inside the one fixing unit 11 to 16 or the other fixing unit 11 to 16 and from the opening to the inside. It characterized that you have and at least one arcuate hook 31, 32 to fix the other end of the one end or the string-like body 21 of the string-like body 21 which is inserted in a substantially horizontal direction It may be . In the invention of claim 2, at least one insertion means 31, 32, 43 of the one fixing means 17 and the other fixing means 17 is open from the inside of the one fixing means 17 or the other fixing means 17. Of the string-shaped body 21 which is gradually expanded from the opening to the inside of the one fixing means 17 or the other fixing means 17 and which is gradually extended as the distance increases. It may be characterized by having at least one arc-shaped hook 31, 32 that fixes one end or the other end of the string-like body 21.
[0010]
According to the seismic isolation structure fall-off prevention device described in claim 1 and the seismic isolation structure fall-off prevention device described in claim 2 , the string- like body smoothly contacts the arc-shaped hook, so that there is little damage. The hook can fix the string-like body more reliably, is easy to manufacture, and can make the fixing means smaller.
[0011]
The invention of claim 3 (for example, FIG. 4) is the seismic isolation structure drop prevention device according to claim 1 or 2 , wherein the sliding member 23 is interposed between the string-like body 21 and the insertion means 31, 32. This is a device for preventing the seismic isolation structure from falling off.
[0012]
According to the fall prevention device of the third aspect, the same effect as that of the first or second aspect can be obtained, and the tensile force applied to the string-like body can be equalized.
[0013]
The invention of claim 4 (for example, FIG. 4) is the seismic isolation structure drop prevention device according to any one of claims 1 to 3 , wherein the cushioning material 22 is interposed between the string-like body 21 and the insertion means 31, 32. This is a device for preventing the seismic isolation structure from falling off.
[0014]
According to the dropout prevention device according to the fourth aspect, the same effects as in the first to third aspects can be obtained, and a buffer material is interposed between the string-like body and the insertion means. The impact load applied to the fixing unit can be reduced.
[0015]
The invention of claim 5 (for example, FIGS. 1 and 3 to 10) is the seismic isolation structure drop prevention device according to any of claims 1 to 4 , wherein the string-like body 21 and the fixing means 11 to 17 are rainwater. The seismic isolation structure drop-off prevention device is characterized by having waterproof means 61 interposed between the lower structure 3 and the upper structure 2 so as to prevent the adhesion of them .
[0016]
According to the fall prevention device of the fifth aspect, the same effects as in the first to fourth aspects can be obtained, and the rain water does not enter because the string-like body and the fixing means are covered with the waterproof means.
[0017]
The invention of claim 6 (for example, FIGS. 1 and 3 to 10) is the seismic isolation structure drop prevention device according to any of claims 1 to 5 , wherein the string-like body 21 and the fixing means 11 to 17 are: interposed between the lower structure and the upper structure covering these, a falling-off prevention device seismic isolation structure, characterized in that it comprises a refractory material 61.
[0018]
According to the dropout prevention device of the sixth aspect, the same effects as in the first to fifth aspects can be obtained, and the string-like body and the fixing means are covered with the bellows made of the fireproof material, so that the fireproof performance is achieved. Have
[0019]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a drop-off prevention device for a seismic isolation structure according to the present invention will be described in detail with reference to the drawings.
[0020]
(First embodiment)
FIG. 1A is a plan sectional view of the present embodiment, and FIG. 1B is a longitudinal sectional view of the present embodiment, showing a state in which the drop-off prevention device is attached to the structure by the fixing means 11. . FIG. 2A is a plan cross-sectional view of a state in which the drop-off preventing device of the present embodiment is attached to the upper structure 2 and the lower structure 3, and FIG. 2B is a vertical cross-sectional view at the A position. In this example, as shown in FIG. 2, the seismic isolation bearing 1 is interposed between the upper structure 2 and the fixed lower structure 3, and the drop-off prevention device is connected to the upper structure 2 via the fixing means 11. And the lower structure 3. A gap in the floor between the upper structure 2 and the lower structure 3 on the foundation side is closed by a telescopic floor slab 4 so that it can pass through.
[0021]
The upper structure 2 and the lower structure 3 are provided with fixing means 11 as shown in FIG. A cylindrical hook 31 and a columnar hook 32 having a circular arc shape in plan view are fixed to the base plate 41 inside the fixing unit 11. The hooks 31 and 32 are formed with a plurality of grooves for hanging the rope. The base plate 41 is fixed to the upper structure 2 or the lower structure 3 with nuts 51 and bolts 52. The base plate 44 and the hooks 31 and 32 may be metal members such as high-strength brass steel.
[0022]
The hooks 31 and 32 are covered with a cover 42, and the cover 42 is provided with an opening through which the string-like body 21 is inserted. The opening provided in the cover 42 has a curved portion 43 that gradually expands from the inside toward the opening. The string-like body 21 is inserted through the opening and fixed to the hooks 31 and 32, and connects the upper structure 2 and the lower structure 3 with a certain deflection. This deflection is set so that the string-like body 21 is tensioned by the deformation of the upper structure 2 to limit the deformation and can be prevented from falling off the lower structure 3.
[0023]
The string-like body 21, aramid fibers as synthetic fibers, polyamide fibers, polyester fibers, polyvinyl alcohol fibers, or the like, and other high-strength fibers such as carbon fibers and glass fibers.
[0024]
A bellows-shaped protective material 61 is attached to the opening having the string-like body 21 and the curved portion 43. The refractory material constituting the bellows-like protective material 61 is composed of a suitable combination of fire-resistant material such as rock wool, ceramic fiber blanket, glass cloth, fire-resistant nonwoven fabric having flexibility, and other waterproof skin material. Has been. Thereby, the drop-off prevention device is provided with a dustproof effect, a waterproof effect, and a fireproof performance. The string-like body 21 is appropriately bundled by a retaining ring 62.
[0025]
(Second Embodiment)
The dropout prevention apparatus of the present invention is obtained by replacing the fixing unit 11 in the dropout prevention apparatus described in Embodiment 1 with the fixing unit 12 shown in FIG.
[0026]
Inside the fixing means 12, two cylindrical hooks 31 are fixed to the base plate 41 along the insertion direction of the string-like body 21. The hooks 31 and 32 are not limited to this example, and a plurality of hooks 31 and 32 may be attached in the direction perpendicular to the insertion of the string-like body 21 in plan view. Other elements are the same as those in the first embodiment, and are omitted.
For this reason, the number of the string-like bodies 21 can be increased easily, and the tensile load can be increased.
[0027]
(Third embodiment)
In the dropout prevention apparatus of the present invention, the fixing unit 11 in the dropout prevention apparatus described in the first embodiment is replaced with a fixing unit 13 shown in FIG.
[0028]
A cylindrical hook 31 is fixed to the base plate 41 inside the fixing unit 13. The hook 31 is covered with a cover 44, and the cover 44 is rotatably attached to the hook 31 by a rotation pin 45 and a bearing 46.
For this reason, even if the upper structure 2 is displaced in the front-rear and left-right directions, the string-like body 21 freely rotates and follows the deformation.
[0029]
(Fourth embodiment)
The dropout prevention device of the present invention is obtained by replacing the fixing unit 13 in the dropout prevention device described in Embodiment 3 with a fixing unit 14 shown in FIG.
[0030]
A semi-cylindrical outer shell hook 33 is rotatably fixed to the outer peripheral portion of the hook 31. Although not shown in the figure, the contact surface between the hook 31 and the outer shell hook 33 is configured to have less friction by Teflon or the like.
For this reason, even if the upper structure 2 is displaced back and forth, and left and right, the string-like body 21 can freely rotate to follow the deformation, and the number of the string-like bodies 21 can be easily increased.
[0031]
(Fifth embodiment)
The dropout prevention apparatus of the present invention is obtained by replacing the fixing unit 11 in the dropout prevention apparatus described in Embodiment 1 with a fixing unit 15 shown in FIG.
[0032]
A base plate 41 is moored in a groove provided in the lower structure 3, and a bearing 47 is interposed on the lower surface of the base plate 41.
For this reason, even if the upper structure 2 is displaced in the front-rear and left-right directions, the string-like body 21 freely rotates and follows the deformation.
[0033]
(Sixth embodiment)
The dropout prevention apparatus of the present invention is obtained by replacing the fixing unit 11 in the dropout prevention apparatus described in Embodiment 1 with a fixing unit 16 shown in FIG.
FIG. 8 is a longitudinal sectional view in which a plurality of fixing means 16 according to the present embodiment are attached to the lower structure 3 and a plurality of fixing means 11 according to the first embodiment are attached to the upper structure 2.
[0034]
A cylindrical hook 31 and columnar hooks 32 a, 32 b, 32 c, 32 d having a circular arc shape in plan view are fixed to the base plate 41 inside the fixing unit 16. The hooks 31, 32a, 32b, 32c, and 32d are formed with a plurality of grooves for hanging ropes.
The string-like body 21 inserted from the left side of the paper is inserted from the opening and fixed to the hooks 31 and 32b, and the string-like body 21 inserted from the right side of the paper has a symmetric configuration. Moreover, the string-like body 21 inserted from the upper side of the paper is inserted from the opening and fixed to the hooks 31 and 32d, and the string-like body 21 inserted from the lower side of the paper has a symmetric configuration.
For this reason, the deformation limit distance of the upper structure 2 and the allowable load of the apparatus can be made different from front to back and left and right by changing the amount of deflection and the number of the front and rear and right and left of the string-like body 21.
[0035]
(Seventh embodiment)
FIG. 9A is a plan sectional view of the present embodiment at the position A, and FIG. 9B is a longitudinal sectional view of the present embodiment, in which the drop-off prevention device is attached to the structure by the fixing means 17. Indicates the state. FIG. 10A is a plan cross-sectional view of the state where the drop-off prevention device of the present embodiment is attached to the upper structure 2 and the lower structure 3, and FIG. 10B is a vertical cross-sectional view at the A position. In this example, as shown in FIG. 10, the seismic isolation bearing 1 is interposed between the upper structure 2 and the fixed lower structure 3, and the drop-off prevention device is connected to the upper structure 2 via the fixing means 17. And the lower structure 3. The periphery of the seismic isolation bearing 1 is covered with a fireproof member 5.
[0036]
A cylindrical hook 31 and a columnar hook 32 having a circular arc shape in cross section are fixed inside the cylindrical fixing unit 17. The hooks 31 and 32 are formed with a plurality of grooves for hanging the rope. The cylindrical fixing unit 17 is fixed to the upper structure 2 or the lower structure 3 with a nut 51 and a bolt 52.
[0037]
The opening of the fixing unit 17 has a curved portion 43 that gradually expands from the inside toward the opening. The string-like body 21 is inserted through the opening and fixed to the hooks 31 and 32, and connects the upper structure 2 and the lower structure 3 with a certain deflection. This deflection is set so that the string-like body 21 is tensioned by the deformation of the upper structure 2 to limit the deformation and can be prevented from falling off the lower structure 3.
[0038]
A bellows-shaped protective material 61 is attached to the opening having the string-like body 21 and the curved portion 43. The refractory material constituting the bellows-like protective material 61 is composed of a suitable combination of fire-resistant material such as rock wool, ceramic fiber blanket, glass cloth, fire-resistant nonwoven fabric having flexibility, and other waterproof skin material. Has been. Thereby, the drop-off prevention device is provided with a dustproof effect, a waterproof effect, and a fireproof performance. The string-like body 21 is appropriately bundled by a retaining ring 62.
[0039]
The dropout prevention device of the present invention is not limited to the above embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
The drop-off prevention device may be configured to connect a plurality of upper structures 2 provided on the lower structure 3. Moreover, you may apply to the structure which has a deformation | transformation means similar to the seismic isolation bearing 1. FIG.
The string-like body 21 may be appropriately connected to the upper structure 2 and the lower structure 3 with a spring or a damper in order to prevent wind shaking. The bellows-like protective material 61 may have an effect equivalent to that of a spring using a material having elasticity, or may be a material energized with a viscoelastic material such as lead.
The fixing means 11 and the like are fixed to the upper structure 2 and the lower structure 3 by the nut 51 and the bolt 52. However, the fixing means 11 and the like are not limited thereto, and are fixed to the upper structure 2 or the lower structure 3, and the string-like body 21 The base plate 41 and the cover 42 may be fixed so that the base plate 41 and the cover 42 are in contact with a supporting plate having a surface perpendicular to the insertion direction of the cord 21 and having an opening for insertion of the string-like body 21. In this case, the bearing plate may be formed in a box shape, and a buffer material may be provided on the contact surface between the bearing plate, the base plate 41 and the cover 42. The cross-sectional shape in plan view of the cylindrical fixing unit 17 is not limited to a circle, and may be a square, a triangle, a polygon, an ellipse, or the like. Alternatively, a screw may be cut around the outer periphery of the cylindrical fixing means 17 and fixed to a nut fixed to the upper and lower structures.
In addition, it is needless to say that specific detailed structures can be changed as appropriate.
[0040]
【The invention's effect】
According to the dropout prevention device of the first aspect, in the base isolation structure, the lower structure side and the upper structure side are connected by the string-like body and the fixing means, and the displacement between the lower structure and the upper structure is a predetermined amount. When it reaches, it can be tensioned to prevent the structure from falling off. By using a high-strength fiber rope for the string-like body, it flexibly follows the deformation of the upper structure and does not corrode. Moreover, a large tensile load can be borne by connecting a plurality of string-like bodies.
[0041]
In the seismic isolation structure according to claim 2, since the lower structure side and the upper structure side are connected by the string-like body and the fixing means in the seismic isolation structure, the vertical load acting on the seismic isolation bearing is Even when the support is damaged beyond the allowable value, the string-like body can be tensioned to prevent the structure from falling off. Further, by limiting the horizontal displacement between the lower structure and the upper structure to a predetermined amount, it is possible to prevent the seismic isolation bearing from being damaged. Since the fixing means has a cylindrical shape and is embedded in the upper and lower structures, a small pulling resistance can be obtained. By using a high-strength fiber rope for the string-like body, it flexibly follows the deformation of the upper structure and does not corrode. Moreover, a large tensile load can be borne by connecting a plurality of string-like bodies.
[0042]
According to the drop-off prevention device of the first or second aspect , the same effect as that of the first or second aspect can be obtained, and the string-like body smoothly contacts the arc-shaped hook, so that the damage is small. The hook can fix the string-like body more reliably, is easy to manufacture, and can make the fixing means smaller.
[0043]
According to the fall prevention device of the third aspect, the same effect as that of the first or second aspect can be obtained, and the tensile force applied to the string-like body can be equalized.
[0044]
According to the dropout prevention device of the fourth aspect, the same effects as in the first to third aspects can be obtained, and the buffer member is interposed between the string-like body and the insertion means, so that the string-like body and the fixing member are fixed. The impact load applied to the means can be reduced.
[0045]
According to the dropout prevention device of the fifth aspect, the same effect as in the first to fourth aspects can be obtained, and since the string-like body and the fixing means are covered by the waterproof means, rainwater does not enter.
[0046]
According to the dropout prevention device of the sixth aspect, the same effects as those of the first to fifth aspects can be obtained, and the string-like body and the fixing means are covered with the bellows made of the fireproof material. Have.
[Brief description of the drawings]
FIG. 1 is an example of a drop-off prevention device of the present invention, (a) is a plan sectional view, and (b) is a longitudinal sectional view. (Example 1)
FIGS. 2A and 2B are application examples of the drop-off prevention device of the present invention, in which FIG. 2A is a plan sectional view, and FIG. (Example 1)
FIGS. 3A and 3B show another example of the fixing unit, in which FIG. 3A is a plan sectional view, and FIG. 3B is a longitudinal sectional view. (Example 2)
FIGS. 4A and 4B are still another example of a fixing unit, in which FIG. 4A is a plan sectional view, and FIG. 4B is a longitudinal sectional view. (Example 3)
FIGS. 5A and 5B are still another example of a fixing unit, in which FIG. 5A is a plan sectional view, and FIG. 5B is a longitudinal sectional view. Example 4
6A and 6B show still another example of the fixing unit, in which FIG. 6A is a plan sectional view, and FIG. 6B is a longitudinal sectional view. (Example 5)
7A and 7B show still another example of the fixing unit, in which FIG. 7A is a plan sectional view, and FIG. 7B is a longitudinal sectional view. (Example 6)
FIG. 8 is a longitudinal sectional view of an application example of the dropout prevention device of the present invention. (Example 6)
9A and 9B show another example of the drop-off prevention device of the present invention, where FIG. 9A is a plan sectional view at position A, and FIG. (Example 7)
10A and 10B are application examples of the drop-off prevention device of the present invention, in which FIG. 10A is a plan sectional view, and FIG. (Example 7)
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seismic isolation bearing 2 Upper structure 3 Lower structure 4 Telescopic floor slabs 11-17 Fixing means 21 String-like body 22 Buffer 23 Slide member 31, 32 Hook 33 Outer shell hook 34 Frame member 41 Base plate 42 Cover 43 Convex Portion 44 Rotating cover 45 Pin 46, 47 Bearing 51 Nut 52 Bolt 61 Bellows protective material 62 Retaining ring

Claims (6)

When the upper structure is displaced by a predetermined amount in the seismic isolation structure that is interposed between the lower structure and the upper structure and includes a base isolation support that supports the upper structure so as to be movable in the horizontal direction. At least one string-like body that regulates the displacement of the structure by tension, and is fixed to one of the upper structure and the lower structure, or is rotatably attached only in a horizontal plane, and is substantially horizontal from the opening to the inside. One fixing means for fixing one end portion of the string-like body inserted in the direction, and fixed to the other of the upper structure and the lower structure or attached only rotatably in a horizontal plane and from the opening has the other fixing unit for fixing the other end of the string-like body which is inserted in a substantially horizontal direction therein, the cord-like in at least one of the one of the fixing means and the other fixing means interpolation through means for inserting the body Provided, string-like body is at least one closure between the inserted substantially horizontally into at least one insertion means substructure and superstructure of one of the fixing means and the other fixing means A ring is formed, and one end of the string-like body or the other end of the string-like body is swingably connected to the lower structure or the upper structure , and one of the fixing means and the other fixing means At least one of the insertion means is provided inside the one fixing means or the other fixing means and the curved shape portion that gradually spreads from the inside of the one fixing means or the other fixing means toward the opening, and the one fixing means or the other fixing means. And at least one arc-shaped hook that fixes one end of the string-like body inserted through the opening into the inside in a substantially horizontal direction or the other end of the string-like body. Preventing the seismic isolation structure from dropping Location. When the upper structure is displaced by a predetermined amount in the seismic isolation structure that is interposed between the lower structure and the upper structure and includes a base isolation support that supports the upper structure so as to be movable in the horizontal direction. At least one string-like body that regulates the displacement of the structure by tension, and a string that is embedded and fixed in one of the upper structure and the lower structure, and that is inserted through the opening in a substantially vertical direction. One cylindrical fixing means for fixing one end of the cylindrical body and the fixing means embedded in the other of the upper structure and the lower structure and fixed in the substantially vertical direction through the opening. And the other fixing means having a cylindrical shape for fixing the other end of the string-like body, and the string-like body is inserted into at least one of the one fixing means and the other fixing means. interpolation through means is provided for, string-like body is one of the fixing means Forming at least one closed loop between the lower structure and the upper structure is substantially inserted in the vertical direction to at least one of the insertion means of the fine other fixing means, one end of the string-like body Alternatively, the other end of the string-like member is swingably connected to the lower structure or the upper structure, and at least one insertion means of the one fixing means and the other fixing means is one fixing means. Alternatively, a curved portion that gradually expands from the inside of the other fixing unit toward the opening and the inside of the one fixing unit or the other fixing unit and is inserted into the inside from the opening in a substantially vertical direction. An apparatus for preventing a seismic isolation structure from falling off , comprising: at least one arc-shaped hook for fixing one end of the formed string-like body or the other end of the string-like body . 3. The seismic isolation structure drop prevention device according to claim 1, wherein a sliding member is interposed between the string-like body and the insertion means. In the falling-off prevention device seismic isolation structure according to any one of claims 1 to 3 falling-off prevention of the seismic isolation structure, wherein a cushioning material is interposed between the string-like body and the insertion means apparatus. The seismic isolation structure drop-off prevention device according to any one of claims 1 to 4 , wherein the string-like body and the fixing means cover the lower structure and the upper structure so as to prevent adhesion of rainwater. A device for preventing a seismic isolation structure from falling off, characterized by having a waterproof means interposed therebetween. The seismic isolation structure drop prevention device according to any one of claims 1 to 5 , wherein the string-like body and the fixing means are interposed between the lower structure and the upper structure so as to cover them. A device for preventing a seismic isolation structure from falling out, characterized by having a material.

Images