JP2002286090A - Drop out prevention device of base isolated structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolated structure limitting the horizontal displacement of a building within a predetermined range and preventing drop out due to an excessive horizontal displacement. SOLUTION: In the base isolated structure supported by a base isolation support between the lower structural body 3 and the upper structural body 2, a stringy body 21 tensed when the upper structural body is displaced by a specified distance to regulate the displacement of the structural body, an anchorage means 11 at the end of the stringy body are provided. In the end of the stringy body, the anchorage means 11 is installed. In the anchorage means 11, the stringy body 21 is inserted almost horizontally and fixed to an arcuate hook and the end of the insertion inlet has a curved shape widened gradually as it goes from the inside to the opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation structure for a structure or a bridge girder.

[0002]

2. Description of the Related Art In order to suppress excessive deformation of a base-isolated structure due to an earthquake, a displacement limiting device using a string-like body is known. Also, a bridge prevention device using a PC steel material, a PC cable, or the like is known.

However, the space in which the seismic isolation device is installed is limited in height and requires a space for mounting. In addition, when a PC steel material, a PC cable, or the like is used, the fixing of the ends becomes complicated.

[0004]

The problem to be solved is that the drop-out prevention device cannot be mounted in a limited space in a small size. Further, the fixing mechanism is complicated in the case of PC steel or the like, and corrosion may occur due to infiltration of rainwater or the like.

[0005]

The present invention has the following arrangement to solve the above-mentioned problems. The invention according to claim 1 (for example, FIGS. 1 and 3 to 7) is provided 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 provided with the seismic bearing 1, at least one string-like body 21 which is strained when the upper structure 2 is displaced by a predetermined amount to regulate the displacement of the structure
And one fixing means 11 to 1 at one end of the string-shaped body.
6 and the other fixing means 11 on the other end of the string-shaped body 21.
16 are provided, and the fixing members 11 to 16
At least one insertion means 31, 3 for inserting
2 and 43 are provided, and the string-like body 21 is inserted in at least one of the insertion means 31, 32 and 43 in a substantially horizontal direction to form at least one closed loop between the lower structure 3 and the upper structure 2. A device for preventing a seismic isolation structure from falling off, wherein the ends of the string-like members 21 are connected to each other or are swingably connected to the lower structure 3 or the upper structure 2.

According to the first aspect of the present invention, in the seismic isolation structure, the lower structure side and the upper structure side are connected to each other by the cord and the fixing means, and the lower structure and the upper structure are connected to each other. When the displacement reaches a predetermined amount, the structure becomes tensed and the structure can be prevented from falling off. By using a high-strength fiber rope for the cord-like body, it follows the deformation of the upper structure flexibly and does not corrode. Also, by connecting a plurality of strings,
Can bear a large tensile load.

The invention of claim 2 (for example, FIGS. 9 to 10)
In a seismic isolation structure having a seismic isolation bearing 1 interposed between a lower structure 3 and an upper structure 2 and supporting the upper structure 2 movably in a horizontal direction, the upper structure 2 At least one string-like body 21 that is strained to regulate the displacement of the structure when it is quantitatively displaced, one fixing means 17 at one end of the string-like body, and the other end of the string-like body 21 The section is provided with the other fixing means 17, and the cylindrical fixing means 17 is provided with at least one insertion means 31, 32, 43 for inserting the cord 21, and the cord 21 is at least One of the insertion means 31, 32, and 43 is inserted in a substantially vertical direction so that at least one piece is provided between the lower structure 3 and the upper structure 2.
Of the seismic isolation structure, characterized in that two closed loops are formed, and the ends of the strings 21 are connected to each other or are swingably connected to the lower structure 3 or the upper structure 2. Fall prevention device.

According to the second aspect of the present invention, 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 a load or the like exceeds the allowable value and damages the bearing, the string-like body is tensioned and the structure can be prevented from falling off. In addition, 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 and large pull-out resistance can be obtained. By using a high-strength fiber rope for the cord-like body, it follows the deformation of the upper structure flexibly and does not corrode. In addition, a large tensile load can be borne by connecting a plurality of strings.

According to a third aspect of the present invention (for example, FIG. 1), in the drop-off prevention device according to the first or second aspect, the insertion means 31,
32, 43 have at least one arc-shaped hook 31, 32 provided on the base plate 41,
Is inserted through the opening and fixed to the hooks 31 and 32, and the opening has a curved shape 43 that gradually widens from the inside to the opening, wherein the seismic isolation structure is prevented from falling off.

According to the third aspect of the present invention, the same effects as those of the first and second aspects are obtained, and the cord is smoothly in contact with the arc-shaped hook, so that damage is small. The hook can fix the string-like body more reliably, is easy to manufacture, and can make the fixing means smaller.

The invention according to claim 4 (for example, FIG. 4) is a device for preventing a seismic isolation structure from falling off according to any one of claims 1 to 3, wherein A device for preventing a seismic isolation structure from falling off, wherein a sliding member 23 is interposed.

According to the fourth aspect of the present invention, the same effects as those of the first to third aspects can be obtained, and the tensile force applied to the cord can be equalized.

According to a fifth aspect of the present invention (for example, FIG. 4), in the apparatus for preventing a seismic isolation structure from falling off according to any one of the first to fourth aspects, the gap between the cord-like body 21 and the insertion means 31, 32 is provided. An apparatus for preventing a seismic isolation structure from falling off, wherein a buffer material 22 is interposed.

According to the fall prevention device of the fifth aspect, the same effects as those of the first to fourth aspects are obtained, and the cushioning material is interposed between the string-like body and the insertion means. The impact load applied to the shape and the fixing means can be reduced.

The invention according to claim 6 (for example, FIGS. 1, 3 to 1)
0) is a device for preventing a seismic isolation structure from falling off according to any one of claims 1 to 5, wherein the cord 21 and the fixing means 11 to 1 are attached.
Numeral 7 is a fall-prevention device for a base-isolated structure, comprising a waterproofing means 61 interposed between the lower structure 3 and the upper structure 2 so as to prevent the adhesion of rainwater. .

According to the fall prevention device of the sixth aspect, the same effects as those of the first to fifth aspects can be obtained, and since the string-like body and the fixing means are covered by the waterproof means, rainwater can enter. There is no.

The invention of claim 7 (for example, FIGS. 1, 3 to 1)
0) is a device for preventing a seismic isolation structure from falling off according to any one of claims 1 to 6, wherein the string-like body 21 and the fixing means 11 to 1 are provided.
7 is a device for preventing a seismic isolation structure from falling off, comprising a refractory material 61 interposed between the lower structure and the upper structure so as to cover them.

According to the falling-off preventing device according to the seventh aspect, the same effects as those of the first to sixth aspects can be obtained, and the cord-like body and the fixing means are covered with the bellows made of a fire-resistant material. Has fire resistance performance.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a fall prevention device for a seismic isolation structure according to the present invention will be described in detail with reference to the drawings.

(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. The state attached to the structure by the means 11 is shown. FIG. 2A is a plan sectional view showing a state in which the fall prevention device of the present embodiment is attached to the upper structure 2 and the lower structure 3, and FIG. 2B is a longitudinal sectional view at a position A. In this example, a seismic isolation bearing 1 is interposed between the upper structure 2 and the lower structure 3 on the fixed side as shown in FIG. And the lower structure 3. A gap in the floor between the upper structure 2 and the foundation-side lower structure 3 is closed by a telescopic floor slab 4 so as to allow passage.

The upper structure 2 and the lower structure 3 are provided with fixing means 11 as shown in FIG. Fixing means 11
A column-shaped hook 31 and a column-shaped hook 32 having a circular arc shape in a plan view are fixed to a base plate 41. The hooks 31 and 32 are formed with a plurality of grooves for hanging a rope. The base plate 41 is fixed to the upper structure 2 or the lower structure 3 by nuts 51 and bolts 52. Base plate 44 and hooks 31, 32
May be a metal member such as high-strength brass steel.

The hooks 31 and 32 are covered with a cover 42, and the cover 42 has an opening through which the cord 21 is inserted. The opening provided in the cover 42
It has a curved shape 43 that gradually widens from the inside to the opening. The string-like body 21 is inserted through the opening and is fixed to the hooks 31 and 32, and connects the upper structure 2 and the lower structure 3 with a certain flexure. This bending is set so that the string-like body 21 is strained by the deformation of the upper structure 2 to limit the deformation and prevent the string-like body 21 from falling off from the lower structure 3.

The string 21 is made of an aramid fiber, a polyamide fiber, a polyester fiber, a polyvinyl alcohol fiber or the like as a synthetic fiber, and is made of a high-strength fiber such as a carbon fiber or a glass fiber.

A bellows-shaped protection member 61 is attached to the opening having the string state 21 and the curved shape 43. The fire-resistant material constituting the bellows-like protective material 61 is a flexible rock wool, ceramic fiber blanket,
It is composed of a suitable combination of fire-resistant materials such as glass cloth and fire-resistant nonwoven fabric, and other waterproof skin materials. As a result, the fall prevention device is provided with a dustproof effect, a waterproof effect, and a fireproof performance. The string-like bodies 21 are appropriately bound by a retaining ring 62.

(Second Embodiment) In a fall prevention device of the present invention, the fixing means 11 in the fall prevention device described in the first embodiment is replaced with a fixing means 12 shown in FIG.

Inside the fixing means 12, two columnar hooks 31 are fixed to a base plate 41 along the insertion direction of the cord-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 a direction perpendicular to the insertion direction of the cord-like body 21 in plan view. The other elements are the same as in the first embodiment, and will not be described. For this reason, the number of cords 21 can be easily increased, and the tensile load can be increased.

(Third Embodiment) In a fall-off prevention device of the present invention, the fixing means 11 in the fall-off prevention device described in the first embodiment is replaced with a fixing means 13 shown in FIG.

Inside the fixing means 13, a column-shaped hook 31 is fixed to a base plate 41. Hook 3
1 is covered with a cover 44, and the cover 44 is rotatably attached to the hook 31 by a rotating pin 45 and a bearing 46. For this reason, even if the upper structure 2 is displaced back and forth and left and right, the cord-like body 21 freely rotates and follows the deformation.

(Fourth Embodiment) In a fall-off prevention device of the present invention, the fixing means 13 in the fall-off prevention device described in the third embodiment is replaced with a fixing means 14 shown in FIG.

A semi-cylindrical outer shell hook 33 is rotatably fixed to the outer periphery of the hook 31. Although not shown, the contact surface between the hook 31 and the outer shell hook 33 is configured by Teflon (registered trademark) or the like to reduce friction. For this reason, even if the upper structure 2 is displaced back and forth, left and right, the cords 21 can freely rotate and follow the deformation, and the number of cords 21 can be easily increased.

(Fifth Embodiment) In a fall-off prevention device of the present invention, the fixing means 11 in the fall-off prevention device described in the first embodiment is replaced with a fixing means 15 shown in FIG.

A base plate 41 is moored in a groove provided in the lower structure 3, and a bearing 47 is provided on a lower surface of the base plate 41. For this reason, even if the upper structure 2 is displaced back and forth, left and right, the cord-like body 21 freely rotates and follows the deformation.

(Sixth Embodiment) In a fall-off prevention device according to the present invention, the fixing means 11 in the fall-off prevention device described in the first embodiment is replaced with a fixing means 16 shown in FIG. FIG. 8 shows the fixing means 16 of the present embodiment in the lower structure 3 and the fixing means 11 of the first embodiment in the upper structure 2.
FIG.

Inside the fixing means 16, a column-shaped hook 31 and column-shaped hooks 32a, 32b, 32 having an arc shape in plan view are provided.
c and 32 d are fixed to the base plate 41. The hooks 31, 32a, 32b, 32c, 32d are formed with a plurality of grooves for hanging a rope. The string-like body 21 inserted from the left side of the paper is inserted through 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 symmetrical configuration. Also,
The string-like body 21 inserted from the upper side of the paper is inserted through 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 symmetrical configuration. For this reason, by changing the amount of bending and the number of the front and back and left and right of the string-like body 21, the deformation limit distance of the upper structure 2 and the allowable load of the device can be made different in the front and rear and left and right.

(Seventh Embodiment) FIG. 9 (a) is a plan sectional view at the position A of the present embodiment, and FIG. 9 (b) is a longitudinal sectional view of the present embodiment. Fixing means for fixing means 17
Indicates a state of being attached to the structure. FIG. 10A is a plan sectional view of the state in which the present fall prevention device of the present embodiment is attached to the upper structure 2 and the lower structure 3, and FIG. 10B is a longitudinal sectional view at the position A. In this example, as shown in FIG. 10, a seismic isolation bearing 1 is provided between the upper structure 2 and the lower structure 3 on the fixed side.
The fall prevention device is connected to the upper structure 2 and the lower structure 3 via the fixing means 17. Seismic isolation bearing 1
Is covered with a refractory member 5.

A cylindrical hook 31 and a column-shaped hook 32 having an arcuate cross section are fixed inside the cylindrical fixing means 17. The hooks 31 and 32 are formed with a plurality of grooves for hanging a rope. Cylindrical fixing means 17
Are fixed to the upper structure 2 or the lower structure 3 by nuts 51 and bolts 52.

The opening of the fixing means 17 has a curved shape 43 which gradually widens from the inside to the opening. The cord-like body 21 is inserted through the opening and the hooks 31, 3
2, the upper structure 2 and the lower structure 3 are connected with a certain flexure. This bending is set so that the string-like body 21 is strained by the deformation of the upper structure 2 to limit the deformation and prevent the string-like body 21 from falling off from the lower structure 3.

A bellows-like protection member 61 is attached to the opening having the string state 21 and the curved shape 43. The fire-resistant material constituting the bellows-like protective material 61 is a flexible rock wool, ceramic fiber blanket,
It is composed of a suitable combination of fire-resistant materials such as glass cloth and fire-resistant nonwoven fabric, and other waterproof skin materials. As a result, the fall prevention device is provided with a dustproof effect, a waterproof effect, and a fireproof performance. The string-like bodies 21 are appropriately bound by a retaining ring 62.

It should be noted that the falling-off 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 falling-off prevention device may be configured to connect a plurality of upper structures 2 provided on the lower structure 3. Further, the present invention may be applied to a structure having deformation means similar to the seismic isolation bearing 1. The string-shaped body 21 may be appropriately connected to the upper structure 2 or the lower structure 3 by a spring or a damper in order to prevent wind sway. The bellows-like protective material 61 may be made of a material having elasticity and have the same effect as a spring, or may be made of a material which is urged with a viscoelastic material such as lead. Further, the fixing means 11 and the like are fixed to the upper structure 2 and the lower structure 3 by the nuts 51 and the bolts 52, but are not limited thereto, and are fixed to the upper structure 2 or the lower structure 3, The base plate 41 and the cover 42 may be fixed to a supporting plate having a surface perpendicular to the insertion direction and having an opening for inserting the cord-like body 21 in a movable state. In this case, the supporting plate may be formed in a box shape, and a cushioning material may be provided on a contact surface between the supporting plate and the base plate 41 and the cover 42. The sectional shape of the cylindrical fixing means 17 in plan view is not limited to a circle, but may be a square, a triangle, a polygon, an ellipse, or the like. Further, a screw may be formed on 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 a matter of course that the specific detailed structure can be appropriately changed.

[0040]

According to the fall prevention device of the first aspect,
In the seismic isolation structure, the lower structure side and the upper structure side are connected by a cord and fixing means, and when the displacement between the lower structure and the upper structure reaches a predetermined amount, the structure is dropped and the structure is dropped. Can be prevented. By using a high-strength fiber rope for the cord-like body, it follows the deformation of the upper structure flexibly and does not corrode. In addition, a large tensile load can be borne by connecting a plurality of strings.

According to the second aspect of the present invention, in the seismic isolation structure, since the lower structure side and the upper structure side are connected to each other by the cord and the fixing means, the vertical load acting on the seismic isolation bearing is provided. If the support exceeds the allowable value and the bearing is damaged, the string-like body is strained and the structure can be prevented from falling off. In addition, 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 and large pull-out resistance can be obtained. By using a high-strength fiber rope for the cord-like body, it follows the deformation of the upper structure flexibly and does not corrode.
In addition, a large tensile load can be borne by connecting a plurality of strings.

According to the third aspect of the present invention, the same effects as those of the first and second aspects 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.

According to the fall prevention device of the fourth aspect, the same effects as those of the first to third aspects can be obtained, and the tensile force applied to the cord can be made uniform.

According to the fall prevention device of the fifth aspect, the same effects as those of the first to fourth aspects are obtained, and the cushioning material is interposed between the string-like body and the insertion means. The impact load applied to the body and the fixing means can be reduced.

According to the fall prevention device of the sixth aspect, the same effects as those of the first to fifth aspects can be obtained, and since the string-like body and the fixing means are covered with the waterproof means, rainwater can enter. Absent.

According to the fall prevention device of the seventh aspect, the same effects as those of the first to sixth aspects can be obtained, and the cord-like body and the fixing means are covered with a bellows made of a fire-resistant material. Has fire resistance.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an example of a fall prevention device of the present invention, wherein (a) is a plan sectional view and (b) is a longitudinal sectional view. (Example 1)

FIGS. 2A and 2B are examples of application of a fall prevention device of the present invention, wherein FIG. 2A is a plan sectional view and FIG. (Example 1)

FIGS. 3A and 3B show another example of a fixing unit, wherein FIG. 3A is a plan sectional view and FIG. (Example 2)

FIGS. 4A and 4B show still another example of the fixing unit, wherein FIG. 4A is a plan sectional view and FIG. 4B is a longitudinal sectional view. (Example 3)

FIGS. 5A and 5B show still another example of the fixing means, wherein FIG. 5A is a plan sectional view and FIG. 5B is a longitudinal sectional view. (Example 4)

6A and 6B are still another example of the fixing unit, wherein FIG. 6A is a plan sectional view and FIG. 6B is a longitudinal sectional view. (Example 5)

FIGS. 7A and 7B show still another example of the fixing means, wherein 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 drop-off prevention device of the present invention. (Example 6)

9A and 9B show another example of the falling-off prevention device of the present invention, wherein FIG. 9A is a plan sectional view at a position A, and FIG. 9B is a longitudinal sectional view.
(Example 7)

FIG. 10 is an application example of the falling-off prevention device of the present invention (a).
Is a plan sectional view, and (b) is a longitudinal sectional view at a position A. (Example 7)

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 seismic isolation bearing 2 upper structure 3 lower structure 4 telescopic floor slab 11 to 17 fixing means 21 string 22 buffer material 23 sliding member 31, 32 hook 33 outer shell hook 34 frame member 41 base plate 42 cover 43 convex Part 44 Rotating cover 45 Pin 46, 47 Bearing 51 Nut 52 Bolt 61 Bellows protection material 62 Retaining ring

Claims (7)

[Claims] 1. A seismic isolation structure having a seismic isolation bearing interposed between a lower structure and an upper structure and supporting the upper structure so as to be movable in a horizontal direction. At least one string-like body that is strained to restrict the displacement of the structure when it is displaced quantitatively, one fixing means at one end of the string-like body, and one at the other end of the string-like body; The other fixing means is provided, and the fixing means is provided with at least one insertion means for inserting a cord-like body, and the cord-like body is inserted through at least one of the insertion means in a substantially horizontal direction to form a lower structure. At least one closure loop is formed between the upper structure and the lower structure, and ends of the string are interconnected or swingably connected to the lower structure or the upper structure. For preventing seismic isolation structures from falling off. 2. A seismic isolation structure having a seismic isolation bearing interposed between a lower structure and an upper structure and supporting the upper structure so as to be movable in a horizontal direction. At least one string-like body that is strained to restrict the displacement of the structure when it is displaced quantitatively, one fixing means at one end of the string-like body, and one at the other end of the string-like body; The other fixing means is provided, the tubular fixing means is provided with at least one insertion means for inserting the cord, and the cord is inserted through at least one of the insertion means in a substantially vertical direction. At least one closure loop is formed between the lower structure and the upper structure, and ends of the string are interconnected or swingably connected to the lower structure or the upper structure. A device for preventing a seismic isolation structure from falling off. 3. The drop-off prevention device according to claim 1, wherein the insertion means has at least one arc-shaped hook provided on the base plate, and the cord is inserted through the opening and fixed to the hook. Wherein the opening has a curved shape that gradually widens from the inside toward the opening. 4. A device according to claim 1, wherein a sliding member is interposed between the cord and the insertion means. Device for preventing seismic structures from falling off. 5. The seismic isolation device according to claim 1, wherein a cushioning material is interposed between the cord and the insertion means. Structure fall prevention device. 6. The fall prevention device for a seismic isolation structure according to any one of claims 1 to 5, wherein the string-like body and the fixing means cover the lower structure to prevent rainwater from adhering. An apparatus for preventing a seismic isolation structure from falling off, comprising a waterproof means interposed between the upper structure and the upper structure. 7. An apparatus for preventing a seismic isolation structure from falling off according to any one of claims 1 to 6, wherein the string-like body and the fixing means cover these and intervene between the lower structure and the upper structure. A fall prevention device for a base-isolated structure, characterized by having a refractory material.