JPH10280728A - Protective construction of vibration isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote function by storing a sliding body blocking a space between upstairs slab and downstairs slab in the lower end of a cylindrical body hanging from the upstairs slab and surrounding a vibration isolation device. SOLUTION: An isolator 3 of laminated rubber construction is mounted on a downstairs slab 1, and a beam 5 of an upstairs slab 4 is borne thereon. Then, a precast concrete cylindrical protection cover 10 is hung to the lower surface of the slab 4 and, at the same time, the cover 10 is provided around the isolator 3 at a specific clearance. Then, a sliding body 20 of reinforced precast concrete blocks is mounted to the lower end of the cover 10. In the case an earthquake occurs, the sliding body 20 is slid on the slab 1 by external force applied to the cover 10 monolithically oscillated together with the slab 4. By the constitution, a sense of unity with a column can be designedly formed, fire resistance and impact resistance can be promoted, and in the case it is struck by the earthquake, the maintenance thereof can be easily executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective structure for a seismic isolation device, and more particularly to a structure for protecting a seismic isolation device from fires, so that a floor provided with the seismic isolation device can be used as a parking lot or a warehouse. Related to protective structure.

[0002]

2. Description of the Related Art At present, a laminated rubber isolator is most widely used as an isolator of a seismic isolation device for a middle-high-rise building or the like. This laminated rubber isolator generally has a structure in which thin synthetic rubber sheets and intermediate steel plates are alternately laminated. For the purpose of using the isolator, the rubber material is required to have durability against light, heat, gas, etc. in addition to predetermined mechanical characteristics. In particular, since rubber materials are flammable, sufficient measures must be taken against fire. For this reason, if fireproof measures are not taken in the seismic isolation layer where the isolator is installed, it cannot be used for living spaces such as parking lots and warehouses.

In recent years, there has been an increasing demand for effectively using the seismic isolation layer for living, office space, warehouses, parking lots and the like. For this reason, several proposals have been made to protect seismic isolation devices from building fires. 7 and 8 are explanatory views showing a conventional example in which a conventional seismic isolation device is provided with a fire-resistant protection structure.

In FIG. 7, a protective cover 51 made of ceramic fiber cloth is attached around a plurality of layers around an isolator 50 made of laminated rubber.
Further, a carbon fiber reinforced concrete panel 54 (hereinafter referred to as a CFRC panel 54) extends from the upper end of the column 52 on which the isolator 50 is placed to the beam 53 supported by the isolator 50.
Abbreviated. ) Is attached. The CFRC panel 54 is provided with an isolator 50
Is mounted so as to form an inverted truncated cone that extends obliquely upward so as to obtain a clearance set in accordance with the maximum horizontal displacement amount of. A slight gap 55 is provided between the top of the CFRC panel 54 and the beam 53 to allow the beam 53 to move freely.

FIG. 8 shows a table 61 for supporting the isolator 50.
This shows a conventional example in which the whole is covered with a fire-resistant panel 62 and a fire-resistant seal 64 is applied to a joint of a beam 63 at the upper end of the fire-resistant panel 62.
A fence 65 and the like are also provided to keep people away.

[0006]

In a seismic isolation device provided with a fireproof covering member as a protective structure as described above, for example, in the seismic isolation device shown in FIG. 7, an edge between a CFRC panel and a beam is formed. Because it is cut, it is not possible to completely stop the effects of fire and high temperature overheating. Therefore,
A ceramic fiber cloth layer for directly covering the isolator 50 is provided. Therefore, the cost must be high. Further, since the CFRC panel is directly attached to the upper end of the concrete column, there is a problem in design.

Further, in the fireproof covering structure of the seismic isolation device shown in FIG.
The problem is that the sense of unity of the columns is lost in appearance, and each seismic isolation device has problems in measures such as shock resistance and maintenance after a disaster.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, to obtain a sense of unity as a pillar in design, and to provide sufficient fire resistance, impact resistance, maintenance after a disaster, and the like. It is an object of the present invention to provide a protective structure for a seismic isolation device with consideration given to it.

[0009]

In order to achieve the above-mentioned object, the present invention relates to a method for manufacturing a vehicle, comprising:
From the lower surface of the upper floor slab supported by the seismic isolation device, it is suspended so as to surround the periphery of the seismic isolation device, and the gap between the lower floor slab surface is closed in a recess formed over the entire periphery of the lower end surface. A part of the sliding body is accommodated.

[0010] Further, the assembled whole shape is substantially cylindrical, and is erected on a lower floor slab surface or a base on which the seismic isolation device is mounted so as to surround the periphery of the seismic isolation device. In a recess formed over the entire circumference of the upper end surface, a sliding body that closes a gap between the upper floor slab and the lower surface is elastically supported so as to contact the lower surface of the upper floor slab with a predetermined pressing force. Features.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a protection structure for a seismic isolation device according to the present invention. FIG. 1 is a front view showing a protection structure of the seismic isolation device of the present invention. As shown in the figure, the lower floor slab 1 (basic version, etc.
An isolator 3 having a known laminated rubber structure is installed on the base 2 of the layer where the isolator is installed). This isolator 3 is a beam 5 of an upper slab 4 showing a part thereof.
It is designed to support a part of. A protective cover 10 made of precast concrete is provided around the isolator 3 with a predetermined clearance.

The protective cover 10 is entirely suspended from the lower surface of the upper slab 4 by anchor bolts 11 shown in a simplified diagram. As shown in FIG. 2, the protective cover 10 has a cylindrical shape, and is arranged so as to surround the isolator 3 which is concentric and substantially cylindrical, at equal intervals. The protective cover 10 is 1/4
Manufactured as an arc-shaped piece consisting of a circle,
The circular pieces 10A to 10D are circumferentially combined and arranged around the isolator 3. In FIG. 2, only three protective covers 10 </ b> A to 10 </ b> C are shown to show a positional relationship with the internal isolator 3.

In order to attach the protective cover 10 to the lower surface of the upper floor slab 4, the anchor bolts 1 arranged vertically so as to penetrate the upper floor slab 4 as shown in FIG.
1 to directly support the lower surface of the slab, or use the anchor bolt 11
And the like. FIG. 1 shows an example using a different mounting method for explanation. The detailed configuration of the protective cover 10 is shown in FIG.
(A) will be described with reference to FIG. The protective cover 10 shown in both figures is made of factory-made precast concrete. The protective cover 10 is adapted to fix an anchor bolt 11 disposed through the upper slab 4 to an insert portion formed on the top end surface. Further, grout can be injected into the anchor hole to fix the anchor bolt 11. The wall thickness of the protective cover 10 can be arbitrarily set as long as the fire resistance required by design can be satisfied. good.

Next, the structure of the sliding body 20 incorporated at the lower end position of the protective cover 10 will be described. The protective cover 10 is suspended from the upper floor slab 4, and its wall height is set to be slightly smaller than the space height divided by the upper and lower floor slabs 1, 4. For this reason, a sliding body 20 is attached to the lower end of the protective cover 10 in order to fill a gap created between the lower end of the protective cover 10 and the lower slab 1.

The sliding member 20 is made of a reinforced precast concrete block having a rectangular cross section and an elongated rectangular body. The upper end of the sliding body 20 is accommodated in a downwardly substantially U-shaped steel frame 21 attached to the lower end of the protective cover 10, and the other space in the steel frame 21 has a fireproof coating material 22. Rock wool or the like. Further, a side plate 23 is attached to the outside of the lower end of the protective cover 10. A refractory coating 22 is attached to the surface of the side plate 23. As a result, the intrusion of the flame from the outside can be reliably prevented. As the refractory coating material 22, a mat-like or inorganic plate material or the like made of the same material as that contained in the steel frame 21 is preferable.

The sliding body 20 is used for the upper slab 4 during an earthquake.
The lower slab surface 1 is slid on the lower floor slab surface 1 by an external force applied from the protective cover 10 that swings integrally with the slab surface. It is also preferable to attach a stainless steel plate as the friction reducing member 25 or a fluororesin plate known by the trade name “Teflon” (registered trademark) to the lower surface of the sliding body 20 in order to improve durability. A similar effect can be obtained by finishing the slab floor smoothly. The protective cover 10 is, as shown in FIG.
Needless to say, the shape may be a circular shape, a linear shape as shown in FIG. 4, or a polygonal or further subdivided arc-shaped piece. The upper and lower wall thicknesses of the protective cover 10 are different from those of the protective cover 1 during an earthquake.
It is preferable to set so that a bearing area enough to maintain the compressive strength at zero vibration can be secured. This protective cover 1
When attaching 0, it is preferable to secure a clearance exceeding the limit displacement amount of the isolator 3.

Next, with reference to FIGS. 3B and 5, a description will be given of a modification in which a sliding body 20 is provided at the upper end of the protective cover 10. FIG. As shown in FIG. 3B, the protective cover 10 is erected on the lower slab 1 or on a base (support) via a wet joint 15 to which a steel plate is welded. The example of the divided shape of the protective cover 10 can be the same as that shown in FIG. A support mechanism 30 for supporting the sliding body 20 is provided at the top end position of the protective cover 10.
Is incorporated. This support mechanism 30 is used for the protective cover 1.
A lower plate 31 made of steel fixed to the top end of the lower plate 0, side plates 32 attached to both side surfaces of the lower plate 31 via hinges J, and a lower plate 31 and a side plate 32. A coil spring 33 as an elastic member is accommodated in the space, and an upper seat plate 34 elastically supported by the coil spring 33.

Since the upper plate 34 of the support mechanism 30 is elastically supported by a plurality of coil springs 33 as shown in FIGS. 3B and 5, the sliding body mounted on the upper plate 34 The upper surface of 20 is pressed against the lower surface of upper slab 4 with a predetermined pressing force. At this time, a clearance adjusting member 35 such as a turnbuckle is mounted on the lower seat plate 31 at predetermined intervals alternately with the mounting position of the coil spring 33. For example, the end of the turnbuckle is the upper plate 34
And the lower seat plate 31 via a hinge. For this reason, it is possible to cause relative displacement between the upper seat plate 34 and the lower seat plate 31 at the time of an earthquake, so that excessive bending does not act on the members. In addition, the sliding body 20
Is supported by the upper seat plate 34, first, a turnbuckle 35 as a clearance adjusting member is tightened to provide a clearance for mounting the sliding body 20, and the sliding body 20 is placed on the upper seat plate 34. Thereafter, the turnbuckle 35 is released, and the upper plate 34 is urged upward by the coil spring 33 so that the sliding body 2
The upper surface of the upper slab 4 is adjusted so as to be pressed against the lower surface of the upper slab 4 with a predetermined pressing force. This operation is performed with the side plate 32 shown in FIG. 3 (b) opened from the hinge J position. Finally, the side plate 32 is closed from both sides and tightened with a connecting member 38 such as a horizontal connecting bolt, and fireproof from the outside. A coating material 36 is applied.

Side plate 3 on the side opposite to the side provided with the seismic isolation device
The outer surface of 2 is provided with a refractory coating material 36, so that the ingress of flame from the outside can be reliably blocked. Further, in order to smoothly perform the sliding operation of the sliding body 20 at the top end surface of the sliding body 20 or the lower surface position of the upper floor slab 4, it is preferable to attach the same friction reducing member 37 as described above. With the above-described configuration, the upper floor slab 4 can be displaced independently of the protective cover 10 during an earthquake, and the isolator as a seismic isolation device housed therein by installing the protective cover 10. No. 3 can obtain high durability and fire safety. In addition, it is also preferable to fill the space in which the coil spring 33 and the clearance adjusting member 35 are accommodated with the fire-resistant coating material 22 in order to enhance the fire-resistance performance in the support mechanism 30 of the sliding body 20.

In FIG. 6, when a fire or the like occurs in the seismic isolation layer, no flame or the like enters the space A surrounded by the protective cover 10, but the inside becomes high temperature due to an increase in ambient temperature. There is also a risk. In order to solve this problem, a ventilation facility communicating with the space A that houses the isolator 3 may be provided. For example, it is preferable to provide the air supply pipe 41 on the floor side and the exhaust pipe 40 on the ceiling side. Further, with respect to the exhaust, a mechanical ventilation facility having a fireproof damper (not shown) may be provided. In this case, the fire damper may be operated by a heat sensor.

In addition, for maintenance of the isolator 3, a part of the protective cover 10 is provided with a fire door and a hatch conforming to a predetermined standard (Class A, Class B, etc.) so that daily maintenance, inspection after a disaster, Processing can be performed promptly.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment of a protection structure for a seismic isolation device according to the present invention.

FIG. 2 is a partial perspective view showing a protection structure according to the present invention with a part removed.

FIG. 3 is a sectional view showing a sectional configuration of a protective cover as a protective structure.

FIG. 4 is a partial cross-sectional perspective view of the protective cover shown in FIG.

FIG. 5 is a partial cross-sectional perspective view of the protective cover shown in FIG.

FIG. 6 is a partial cross-sectional view showing an embodiment in which ventilation equipment is provided in the protection structure of the seismic isolation device.

FIG. 7 is a cross-sectional view showing an example of a conventional seismic isolation device protection structure.

FIG. 8 is a cross-sectional view showing an example of a conventional protection structure for a seismic isolation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower floor slab 3 Isolator 4 Upper floor slab 10 Protective cover 20 Sliding body 30 Support mechanism

Claims (2)

[Claims] 1. The overall shape of the assembly is substantially cylindrical.
From the lower surface of the upper floor slab supported by the seismic isolation device, it is suspended so as to surround the periphery of the seismic isolation device, and the gap between the lower floor slab surface is closed in a recess formed over the entire periphery of the lower end surface. A protective structure for a seismic isolation device, characterized in that a part of a sliding body is accommodated. 2. The assembled whole shape is substantially cylindrical.
On the lower floor slab surface or base on which the seismic isolation device is mounted, it is erected so as to surround the periphery of the seismic isolation device, and in the recess formed over the entire periphery of the upper end surface, the lower surface of the upper floor slab is placed. A sliding body for closing a gap between the upper and lower floor slabs is elastically supported so as to abut against a lower surface of the upper floor slab with a predetermined pressing force.