JP6653615B2 - Sliding seismic isolation device - Google Patents

Description

  The present invention relates to a sliding seismic isolation device including upper and lower shoes and a sliding body interposed therebetween.

  In Japan, which is an earthquake-prone country, various structures such as buildings, bridges, elevated roads, and detached houses have various seismic resistance technologies, including technologies to resist seismic force and technologies to reduce seismic force entering structures. Technology, seismic isolation technology, and seismic control technology have been developed and applied to various structures.

  Above all, seismic isolation technology is a technology for reducing the seismic force itself entering a structure, so that the vibration of the structure during an earthquake is effectively reduced. To outline this seismic isolation technology, a seismic isolation device is interposed between the foundation, which is the lower structure, and the upper structure to reduce the transmission of vibration of the foundation due to the earthquake to the upper structure, Vibration is reduced to ensure structural stability. The seismic isolation device is effective not only in the case of an earthquake but also in reducing the influence of traffic vibrations constantly acting on the structure on the upper structure.

  There are various types of seismic isolation devices such as a laminated rubber bearing device containing a lead plug, a high damping laminated rubber bearing device, a device combining a laminated rubber bearing and a damper, and a sliding seismic isolation device. Among them, the configuration of one form is described by taking up the sliding seismic isolation device.The upper and lower shoes with a sliding surface having a curvature, and the upper and lower shoes are in contact with the respective shoes. And a columnar sliding body having an upper surface and a lower surface having the same curvature, and may be referred to as an upper and lower spherical sliding type seismic isolation device or a double concave type seismic isolation device. In this type of seismic isolation device, the operating performance of the upper and lower shoe is governed by a friction coefficient between the upper and lower shoe and a sliding body interposed therebetween, and a friction force obtained by multiplying the coefficient of friction by the coefficient of friction.

  By the way, when the above-mentioned sliding seismic isolation device is installed in the middle floor of a building, that is, forms a so-called middle-rise seismic isolation structure, according to the Building Standards Act, the sliding seismic isolation device is It is required to have the same fire resistance performance as structural members such as columns located above and below.

  More specifically, the sliding seismic isolation device between the upper and lower columns maintains the ability to transmit the long-term axial force acting from the upper column to the lower column in a heating state of 1100 ° C in 3 hours. Is required.

  Therefore, in particular, in the sliding seismic isolation device applied to the middle-rise seismic isolation structure, fire resistance performance in the event of a fire is required in addition to vibration reduction performance in the event of an earthquake.

  Here, Patent Document 1 discloses a fireproof covering structure of the seismic isolation device. Specifically, a sliding plate attached to the lower structure, and a resin or metal sliding material attached to the upper surface of the sliding plate on the lower surface of the sliding bearing formed on the upper structure, This is a sliding bearing type seismic isolation device that has a thermal expansion refractory material that expands in the event of a fire and covers the sliding material in a non-contact state with the sliding plate around the sliding material on the lower surface of the sliding bearing. Things.

  According to the fire-resistant covering structure of this seismic isolation device, the slip plate and the non-slip plate are placed around a resin or metal sliding material for transmitting the load of the upper structure of the building to the lower structure below the seismic isolation device. By attaching the thermal expansion refractory material while maintaining the contact state, the sliding material can be efficiently covered in the event of a fire without affecting sliding during an earthquake.

Japanese Patent No. 5356743

  The fireproof structure of the seismic isolation device disclosed in Patent Literature 1 is composed of a sliding seismic isolation device including an upper shoe, a lower shoe, and a sliding member disposed between the upper shoe and the lower shoe. However, the present invention does not disclose a sliding seismic isolation device provided with a sliding body and having excellent fire resistance performance.

  In addition, the fire-resistant coating structure of the seismic isolation device has a problem in on-site workability since it is essential to attach a fire-resistant coating material surrounding the seismic isolation device on site.

  The present invention has been made in view of the above-described problem, and relates to a sliding seismic isolation device including an upper shoe and a lower shoe, and a sliding body disposed between the upper shoe and the lower shoe. It is an object of the present invention to provide a sliding seismic isolation device that can eliminate the work of installing a fire-resistant covering material, has excellent seismic isolation performance during an earthquake, and has excellent fire resistance during a fire.

  In order to achieve the above object, a sliding seismic isolation device according to the present invention includes an upper shoe having a lower sliding surface having a curvature inside a lower surface thereof and an upper sliding surface having a curvature inside an upper surface thereof. A lower seismic isolator comprising a lower shoe, a columnar sliding body having an upper surface and a lower surface having a curvature in contact with the upper and lower shoes, between the upper and lower shoes, A first heat-expandable refractory material is attached from a side surface of the upper shoe to a region other than the lower sliding surface of the lower surface, and a side other than the upper sliding surface of the upper surface from the side surface of the lower shoe. A second heat-expandable refractory material is mounted over the area, and in a non-fire situation, the first heat-expandable refractory material and the second heat-expandable refractory material are in a non-contact state, and in the event of a fire, The first heat-expandable refractory material and the second heat-expandable refractory material are both thermally expanded and closely adhered to each other, It is intended to seal the space being set.

  In the sliding seismic isolation device of the present invention, the first thermally expandable refractory material is attached from the side surface of the upper shoe to an area other than the lower sliding surface of the lower surface, and the upper shoe slides upward from the side surface of the lower shoe. The second heat-expandable refractory material is attached over the area other than the surface, and in a non-fire situation, the first heat-expandable refractory material and the second heat-expandable refractory material are in a non-contact state. Since the first and second heat-expandable refractory materials do not hinder the sliding of the sliding body during an earthquake, the sliding seismic isolation device has excellent seismic isolation performance during an earthquake.

  Further, in the event of a fire, both the first and second heat-expandable refractory materials are thermally expanded and adhere to each other to seal the space in which the sliding member is disposed, thereby causing a fire. Sliding body can be cut off from the heat at the time, and the sliding body can be prevented from losing sufficient axial force transmission function due to heat deterioration of the sliding body due to heat at the time of fire. It has become.

  More specifically, in the event of a fire, there is a heat flow in which heat enters inside from a gap between the upper and lower shoes, and a heat flow that transfers heat to the sliding body via the upper and lower shoes. Is transferred to the sliding body, and the sliding body may be thermally degraded.

  In response to the heat flow during the fire, the first and second thermally expandable refractory materials are disposed from the side surfaces of the upper and lower shoes to the periphery of the sliding surface. By expanding and closely contacting each other to seal the space in which the sliding member is provided, the above two heat flows can be effectively blocked.

  Here, as the first and second thermally expandable refractory materials, organic refractory materials can be applied.

  Since the first and second heat-expandable refractory materials can be attached in advance to the upper and lower shoes, for example, at a manufacturing plant, the first and second heat-resistant materials are installed at the site where the sliding seismic isolation device is installed. There is no need to install a heat-expandable refractory material, and the sliding seismic isolation device has excellent on-site workability.

  Further, as an embodiment of the sliding seismic isolation device, an annular first stopper is disposed around the lower sliding surface of the lower surface of the upper shoe, and An annular second stopper is provided around the upper sliding surface, the first thermally expandable refractory material is attached to the periphery of the first stopper, and the second thermally expandable refractory material is An example in which the second stopper is attached to the periphery of the second stopper can be given.

  The sliding range of the sliding body is defined by the annular first stopper and the second stopper, and the sliding body is prevented from falling off.

  In addition, since there is an annular first stopper and a second stopper, the inside of the first stopper and the second stopper serves as a sliding surface, the mounting range of the first and second heat-expandable refractory materials becomes clear, and Is also good.

  As can be understood from the above description, according to the sliding seismic isolation device of the present invention, the first thermally expandable refractory material is mounted from the side surface of the upper shoe to an area other than the lower sliding surface of the lower surface thereof, A second heat-expandable refractory material is attached from the side surface of the lower shoe to an area other than the upper sliding surface of the upper surface. Since the materials are in a non-contact state, the first and second thermally expandable refractory materials do not hinder the sliding of the sliding body during an earthquake. Become.

  In the event of a fire, both the first and second heat-expandable refractory materials thermally expand and adhere to each other to seal the space in which the sliding member is disposed, thereby causing a fire. Sliding body can be cut off from the heat at the time, and the sliding body can be prevented from losing sufficient axial force transmission function due to heat deterioration of the sliding body due to heat at the time of fire. Becomes

  Furthermore, since the first and second heat-expandable refractory materials can be pre-attached to the upper shoe and the lower shoe, for example, at a manufacturing plant, the first and second heat-resistant materials are installed at the site where the sliding seismic isolation device is installed. There is no need to attach the second heat-expandable refractory material, and the sliding seismic isolation device has excellent on-site workability.

It is a longitudinal section of an embodiment of a sliding seismic isolation device of the present invention, and is a figure showing the state where it was installed between an upper structure and a lower structure. It is a figure explaining the mode of operation of the sliding seismic isolation device at the time of an earthquake. It is a figure explaining operation of a sliding seismic isolation device at the time of fire, (a) is a figure showing a state before a fire occurs, and (b) is a figure showing a state after a fire occurs.

  Hereinafter, an embodiment of a sliding seismic isolation device of the present invention will be described with reference to the drawings.

(Embodiment of the sliding seismic isolation device)
FIG. 1 is a longitudinal sectional view of an embodiment of a sliding seismic isolation device of the present invention, showing a state where the device is installed between an upper structure and a lower structure.

  The illustrated sliding seismic isolation device 10 includes an upper shoe 1 having a lower sliding surface 1d made of SUS having a curvature inside a lower surface 1a thereof, and an upper sliding surface 2d made of SUS having a curvature having an upper surface 2a. The lower shoe 2 provided on the inside, and between the upper shoe 1 and the lower shoe 2, a columnar steel (including SUS) having a curved upper surface and a lower surface in contact with the upper shoe 1 and the lower shoe 2. And a sliding body 3.

  On the lower surface 1a of the upper shoe 1, an annular first stopper 1c is disposed around the lower sliding surface 1d, and also on the upper surface 2a of the lower shoe 2 around the upper sliding surface 2d. An annular second stopper 2c is provided.

  The sliding range of the sliding body 3 is defined by the first stopper 1c and the second stopper 2c, and the sliding body 3 is prevented from falling off.

  Each of the upper shoe 1, the lower shoe 2, and the sliding body 3 is formed from a rolled steel material for welding steel (SM490A, B, C, or SN490B, C, or S45C), and has a load bearing strength of about 60 MPa in surface pressure. I have.

  Further, it is preferable that a double fabric layer (not shown) is bonded and fixed to each of the upper surface and the lower surface of the sliding body 3. The double woven fabric layer is a double woven fabric layer made of, for example, PTFE fiber and a fiber having a higher tensile strength than the PTFE fiber. Each double fabric layer is fixed to the upper and lower surfaces of the sliding member 3 so as to be disposed on the 2d side. Here, `` fibers having higher tensile strength than PTFE fibers '' include polyamides such as nylon 6.6, nylon 6, nylon 4.6, polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalene. Examples include polyester such as phthalate, and fibers such as para-aramid, meta-aramid, polyethylene, polypropylene, glass, carbon, polyphenylene sulfide (PPS), LCP, polyimide, and PEEK. Further, fibers such as heat fusion fibers, cotton, and wool may be applied. Among them, PPS fibers having excellent chemical resistance and hydrolysis resistance and extremely high tensile strength are desirable. These double fabric layers are bonded and fixed to the upper and lower surfaces of the sliding body 3 via an adhesive such as an epoxy resin adhesive.

  In the sliding seismic isolation device 10, the first heat-expandable refractory material 4 is attached from the side surface 1b of the upper shoe 1 to an area other than the lower sliding surface 1d of the lower surface 1a (around the first stopper 1c). The second heat-expandable refractory material 5 is attached from the side surface 2b of the lower shoe 2 to a region other than the upper sliding surface 2d of the upper surface 2a (from around the second stopper 2c). .

  In the state shown in FIG. 1, that is, in the non-fire state, the first thermally expandable refractory material 4 and the second thermally expandable refractory material 5 are in a non-contact state with each other, and a gap G is provided therebetween. There is. Although not shown, annular dustproof rubbers are respectively attached to the first stopper 1c and the second stopper 2c so as to close the gap G, so that dust does not enter the space in which the sliding body 3 is accommodated. Such a configuration may be adopted. In this embodiment, dust-proof rubber is adhered from the outer side surface of the first stopper 1c to its end surface (the end surface facing the second stopper 2c), and similarly, from the outer side surface of the second stopper 2c. Dust-proof rubber is adhered over the end face (the end face facing the first stopper 1c), and in a non-fire situation, the gap G is closed by both dust-proof rubbers. A heat-expandable refractory material 4 and a second heat-expandable refractory material 5 are respectively attached.

  Here, the first heat-expandable refractory material 4 and the second heat-expandable refractory material 5 are formed of an organic refractory material, and more specifically, “Fibroc” (registered trademark) manufactured by Sekisui Chemical Co., Ltd. ).

  In a non-fire situation, the thickness of the first thermally expandable refractory material 4 and the second thermally expandable refractory material 5 is about 3 mm.

  The first thermally expandable refractory material 4 and the second thermally expandable refractory material 5 can be attached to the upper shoe 1 and the lower shoe 2 at a manufacturing factory in advance. Therefore, the work of attaching the first thermally expandable refractory material 4 and the second thermally expandable refractory material 5 at the site where the slide seismic isolation device 10 is installed becomes unnecessary, and the slide seismic isolation device having excellent on-site workability. It becomes 10.

  As shown in FIG. 1, the sliding seismic isolation device 10 is installed between an upper structure S1 such as a column and a lower structure S2 also like a column, and the upper structure S1 and the lower structure S2 during an earthquake. Is reduced by the operation of the sliding seismic isolation device 10. Furthermore, since the slide seismic isolation device 10 forms a so-called middle-rise seismic isolation structure installed between the upper structure S1 and the lower structure S2, the slide seismic isolation device 10 is provided in accordance with the Building Standards Law. Fire resistance equivalent to that of the upper structure S1 and the lower structure S2 is required. The operation of the seismic isolation device 10 in the event of an earthquake and fire will be described below with reference to FIGS.

  FIG. 2 illustrates an operation mode of the sliding seismic isolation device 10 during an earthquake.

  As shown in FIG. 2, during an earthquake, the sliding body 3 slides between the upper shoe 1 and the lower shoe 2 according to the horizontal displacement of the upper structure S1 and the lower structure S2, so that the seismic force is reduced. Reduction can be achieved.

  Here, in the sliding seismic isolation device 10, since the first thermally expandable refractory 4 and the second thermally expandable refractory 5 are not in contact with each other, these first thermally expandable refractory 4 And the second thermally expandable refractory material 5 does not hinder the horizontal displacement of the upper shoe 1 and the lower shoe 2 and the sliding of the sliding body 3.

  Therefore, the sliding seismic isolation device 10 can exhibit excellent seismic isolation performance during an earthquake.

  On the other hand, FIG. 3 is a diagram for explaining the operation of the sliding seismic isolation device 10 in the event of a fire. FIG. 3 (a) is a diagram showing a state before a fire has occurred, and FIG. It is the figure which showed the state after.

  As shown in FIG. 3 (a), in the event of a fire, the heat flow R1 in which heat from the fire enters the interior from the gap G between the upper and lower shoes 1, and the upper and lower shoes 2, There is a flow of heat R2 that transfers heat to the sliding member 3 through the heat generating member, and the heat is transferred to the sliding member 3 so that the sliding member 3 may be thermally degraded.

  On the other hand, in the sliding seismic isolation device 10, as shown in FIG. 3B, both the first thermally expandable refractory material 4 and the second thermally expandable refractory material 5 thermally expand and thermally expand. The first heat-expandable refractory material 4 'and the second heat-expandable refractory material 5' become in close contact with each other. The space in which the sliding body 3 is provided is sealed.

  For example, the first heat-expandable refractory material 4 and the second heat-expandable refractory material 5 having a thickness of about 3 mm in a non-fire situation are thermally expanded in a fire to have a thickness of 30 mm or more.

  The first heat-expandable refractory material 4 'and the second heat-expandable refractory material 5' come into close contact with each other, so that the heat flow R1 shown in FIG.

  Further, since the thickness of the first thermally expandable refractory material 4 'and the second thermally expandable refractory material 5' expands ten times or more, the heat flow R2 shown in FIG. You.

  As described above, both the first heat-expandable refractory material 4 and the second heat-expandable refractory material 5 are thermally expanded and adhere to each other to seal the space in which the sliding member 3 is disposed. In addition, the sliding member 3 can be shielded from heat at the time of fire, and the sliding member 3 can be prevented from being thermally deteriorated by heat at the time of fire and losing a sufficient axial force transmitting function. For example, it is possible to keep the temperature of the sliding body 3 at about 500 ° C. or lower under an atmosphere of about 1100 ° C. or higher at the time of fire.

  Therefore, the sliding seismic isolation device 10 can exhibit excellent fire resistance performance in the event of a fire.

  Thus, the illustrated sliding seismic isolation device 10 is a sliding seismic isolation device having excellent on-site workability, excellent seismic isolation performance during an earthquake, and excellent fire resistance in a fire.

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

  DESCRIPTION OF SYMBOLS 1 ... Upper shoe, 1a ... Lower surface, 1b ... Side surface, 1c ... First stopper, 1d ... Lower sliding surface, 2 ... Lower shoe, 2a ... Upper surface, 2b ... Side surface, 2c ... Second stopper, 2d ... Upper Sliding surface, 3 ... sliding body, 4, 4 '... first thermal expansion refractory material, 5, 5' ... second thermal expansion refractory material, 10: sliding seismic isolation device, G: gap, S1: upper structure Body, S2 ... Substructure

Claims (1)

An upper shoe having a lower sliding surface having a curvature inside the lower surface thereof,
A lower shoe having an upper sliding surface having a curvature inside the upper surface thereof,
Between the upper shoe and the lower shoe, a columnar sliding body having an upper surface and a lower surface having a curvature in contact with the upper shoe and the lower shoe,
An annular first stopper is provided around the lower sliding surface of the lower surface of the upper shoe,
Of the upper surface of the lower shoe, an annular second stopper is disposed around the upper sliding surface,
A first heat-expandable refractory material is attached from the side of the upper shoe to around the first stopper ,
A second heat-expandable refractory material is attached from the side of the lower shoe to the periphery of the second stopper ,
The first heat-expandable refractory material includes a vertical portion along the side surface of the upper shoe, a vertical portion along a side surface of the first stopper, and the first surface from the side surface on the lower surface of the upper shoe. A horizontal portion which is in a range up to a stopper and connects both the vertical portions,
The second heat-expandable refractory material includes a vertical portion along the side surface of the lower shoe, a vertical portion along a side surface of the second stopper, and the second surface from the side surface on the upper surface of the lower shoe. A horizontal portion that is in the range up to the stopper and connects both of the vertical portions,
At the time of non-fire, the first thermally expandable refractory and the second thermally expandable refractory are in a non-contact state,
In the event of a fire, both the first heat-expandable refractory material and the second heat-expandable refractory material thermally expand and adhere to each other to seal the space in which the sliding member is provided. Quake device.

Images