JP5356743B2 - Fireproof coating structure for seismic isolation devices - Google Patents

Description

  The present invention relates to a fireproof covering structure for a sliding support type seismic isolation device having a sliding material and a sliding plate.

  In general, a sliding support type seismic isolation device is made of a resin or metal having a low frictional resistance so that the sliding material slides smoothly on the upper surface of the sliding plate. When a seismic isolation building equipped with a seismic isolation device is a fireproof building specified by law, this seismic isolation device is also required to have a fire resistance equivalent to the structure of the building, so it is covered with a fireproof material. There is a need.

  In the case of an earthquake-isolated building, the non-contact state is maintained except for the contact portion between the sliding material and the sliding plate in the event of an earthquake, but in the event of a fire, the resin portion and the metal portion must be covered with a refractory material without gaps. A technique that satisfies such conditions is described in Patent Document 1. According to the seismic isolation apparatus described in Patent Document 1, a fireproof insulation molded body such as a calcium silicate molded plate is attached to the upper part of the support column to form a fireproof coating, and heat is received in the gap between the fireproof coating and the upper casing. By disposing a thin film body of foaming type fireproof and heat insulating material, it is possible to provide a seismic isolation device that exhibits a seismic isolation function during an earthquake and is not affected by a flame during a fire.

Japanese Patent No. 4047915

  However, with this technology, it is necessary to place the foam-type fireproof and heat-insulating material along the periphery of the sliding plate, and when applied to a sliding support type seismic isolation device with a large behavior range, there is a problem that it takes a lot of work. there were. In addition, the fireproof coating covering the entire sliding plate also needs to be configured by combining materials in a complicated manner including the steel frame as a base, and there is a problem that it takes time and effort for construction.

  An object of the present invention is to solve such problems of the prior art and to provide a fireproof coating structure for a seismic isolation device that can efficiently constitute a fireproof coating for the seismic isolation device with a minimum amount of materials and labor. It is what.

The first configuration of the fire protection structure of seismic isolation device according to the present invention for solving the above problems of the prior art, a sliding plate mounted on the lower structure, the sliding bearing lower surface formed in the upper structure in sliding bearings type seismic isolation device having a resin or metal skids mounted to slide an upper surface of the sliding plate, around the skids in the sliding bearings lower surface, expands on fire thermal expansion refractory material that covers the sliding member and, characterized in that mounted maintained the sliding plate and the non-contact state.

According to a second configuration of the fireproof covering structure of the seismic isolation device according to the present invention, in the first configuration, the sliding plate is made of resin or metal, and is surrounded by the thermal expansion refractory material on the upper surface thereof. exposure area outside area, sheet or mat of refractory material, characterized in that we covered is placed. According to a third configuration of the fireproof covering structure of the seismic isolation device according to the present invention, in the first or second configuration, the upper structure is a steel structure, and the thermal expansion refractory material includes the upper structure. It is characterized by being continuously adhered to the fireproof coating material to be coated.

  According to the first configuration of the fireproof covering structure of the seismic isolation device according to the present invention, 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 Since the thermal expansion refractory material is attached to the periphery of the sliding plate in a non-contact state, the sliding material can be efficiently coated in the event of a fire without affecting the sliding during an earthquake.

  According to the second configuration of the fireproof covering structure of the seismic isolation device according to the present invention, the region surrounded by the thermally expanded refractory material on the upper surface of the resin or metal sliding plate is covered with the thermally expanded refractory material in the event of a fire. In addition, the exposed area other than the area surrounded by the thermally expanded refractory material is covered by placing a sheet-like or mat-like refractory material. In this way, it is possible to perform the entire fireproof coating on the upper surface of the sliding plate with a simple work, and to reduce the labor of construction. In addition, dust can be prevented from accumulating on the upper surface of the sliding plate, and the initial performance of the seismic isolation device can be maintained.

  A most preferred embodiment of the seismic isolation structure according to the present invention will be described with reference to the drawings. 1 is a perspective view of a seismic isolation building to which the seismic isolation structure according to the present invention is applied, FIG. 2 is a sectional view mainly of a lower structure in the seismic isolation building, and FIG. 3 is a diagram showing a configuration around the seismic isolation device, FIG. 4 is a diagram showing a configuration around the seismic isolation plate, and FIG. 5 is a diagram showing a configuration of a sliding support and a fireproof coating structure applied to the sliding plate constituting the seismic isolation device.

  First, the whole structure of the seismic isolation building A is demonstrated with reference to FIG. The base-isolated building A is a three-layer house, the first floor is a piloti that is an external space except for the entrance, hall and staircase, and the second and third floors have living rooms. As the structure type, the foundation 1 and the column (first floor column) 2 constituting the lower structure B are reinforced concrete, the second and third columns 3 constituting the upper structure C, and the beams 4a to 4c. Is a steel structure, consisting of one span in the wife direction and two spans in the girder direction.

  Next, the configuration of the lower structure B will be described with reference to FIGS. 1 and 2. The lower structure B has a solid foundation type foundation 1, and a column 2 rises from the foundation 1. The column base 2b of the column 2 is rigidly fixed by the foundation beam 1a and the pressure platen 1b, but the column head 2a is not connected by the beam, and the column 2 protrudes in a cantilever state. The diameter of the cylinder 2 is set to 700 mm based on the load acting from the upper structure C. In addition, 1c is the soil concrete which comprises the floor of a piloti.

  Next, the configuration of the upper structure C will be described with reference to FIGS. In the upper structure C, the pillar 3 is formed of a 150 mm square seamless (not having a seam in a horizontal cross section) rectangular steel pipe, and is arranged in the same position as the cylinder 2 in a plan view. A bolt hole is drilled at a predetermined position on the side surface of the column 3 to form a beam joint 3a to which large beams 4a to 4c, which will be described later, are bonded. A slide support 12 (described later) is formed at the lower end of the column 3. 3 is formed integrally.

  The large beams 4a to 4c connecting the adjacent columns 3 are made of H-section steel. Joined plates 4a1 to 4c1 having bolt holes drilled at positions corresponding to the bolt holes formed in the beam joint portion 3a of the column 3 are welded to both ends of the H-shaped steel. The beam joint 3a is metal touched and rigidly joined with a high strength bolt.

  The cantilever beams 5a to 5c made of H-shaped steel having the same cross section as the large beams 4a to 4c are formed on the beam joint portion 3a in the outer direction of the building where the large beams 4a to 4c are not joined among the beam joint portions 3a of the column 3. The joining plates 5a1 to 5c1 that are arranged and configured similarly to the joining plates 4a1 to 4c1 of the large beams 4a to 4c are welded to one end of these cantilever beams 5a to 5c. The beam joint 3a is metal touched and rigidly joined with a high strength bolt. Nose tip beams 6a to 6c made of H-shaped steel having the same cross section as the large beams 4a to 4c are attached to the distal ends of the cantilevers 5a to 5c.

  A hardware (not shown) for supporting and positioning the outer wall panel is attached to the flanges of the nose tip beams 6a to 6c, and the outer wall panel 7 made of an ALC panel is fixed by the hardware to constitute the outer wall 8. In addition, a small beam (not shown) made of H-shaped steel is appropriately bridged between the opposed large beams 4a to 4c, and a floor panel 9 made of an ALC (lightweight cellular concrete) panel is placed on the various beams. A floor 10 is configured by being placed on a flange.

  The floor 10 of the upper structure C protrudes from the column 3 by the cantilever beams 5a to 5c and the nose tip beams 6a to 6c, and the seismic isolation plate E and the seismic isolation device D, which will be described later, are arranged in the area of the floor surface. Is done.

  In addition, in order to make the base-isolated building A a fire-resistant building, the floor panel 9 and the outer wall panel 7 made of ALC panels of steel members such as the columns 3 constituting the upper structure and the various beams 4, 5, 6 are used. The uncovered portion is fire-resistant coated with rock wool having a predetermined fire resistance, a fiber-mixed calcium silicate fire-resistant coating board, a gypsum boat, a mat-shaped fire resistant coating material, and the like (not shown).

  Next, the structure of the seismic isolation apparatus D is demonstrated with reference to FIG. 2, FIG. The seismic isolation device D used in the present embodiment is of a sliding bearing type, and includes a sliding bearing 12 having a supporting function, a sliding plate 13, a restoring rubber 14 having a restoring function, and an oil damper 15 having a damping function. .

  Next, the configuration of the seismic isolation plate E will be described with reference to FIG. The seismic isolation plate E is a member for mounting or fixing the seismic isolation device D. The material is made of steel with a rust-proof coating on the surface. In addition, the thing which gave antirust processing, such as hot dip galvanizing, instead of antirust coating may be used. The shape is a disk shape having an outer diameter of 1370 mm and a thickness of 29 mm, and an annular protrusion 11 that regulates the moving range of the slide support 12 is welded to the upper surface, and the inner surface of the protrusion 11 is the slip plate mounting portion. It is 16. The diameter of the sliding plate mounting portion 16 is set to 890 mm based on the relative maximum displacement calculated from the seismic isolation effect required for the upper structure C, and when the upper structure C is displaced to the maximum extent. In addition, the vertical load from the upper structure C is set so that only the compressive force acts on the seismic isolation plate E and the bending does not act.

  Bolt holes 17 a for bolting the restoring rubber 14 and the oil damper 15 are formed in the peripheral edge 17 outside the protrusion 11. The bolt holes 17a are formed at four equal intervals (90 degree intervals), and there are four or six holes corresponding to the bolt holes of the corresponding functional members (the restoring rubber 14 or the oil damper 15). It has been drilled.

  Portions of the seismic isolation plate E other than the sliding plate mounting portion 16 and the contact surface with the cylinder 2 are covered with a wet fireproof covering material 18 made of sprayed rock wool.

  Next, with reference to FIG. 5, the detailed structure of the sliding bearing 12 and the sliding board 13 which comprise the seismic isolation apparatus D, and the fireproof coating applied to them is demonstrated. The sliding support 12 has a disc-shaped sliding material holding piece 12b having a diameter smaller than that of the flange 12a fitted in and fixed to a concave portion in the center of the lower surface of the disc-shaped flange 12a, and is further fixed to the concave portion in the lower surface center of the sliding material holding piece 12b. A disc-shaped sliding member 12c having a diameter smaller than that of the holding piece 12b is fitted so that its lower end protrudes from the lower surface of the sliding piece holding piece 12b. And it is bolt-joined to the lower surface of the circular joining plate 3b welded to the lower end part of the pillar 3 which protruded below rather than the lower flange of the first beam 4a. The slip plate 13 has an octagonal plate shape, and is mounted and fixed on the slide plate mounting portion 16 so that the apex is substantially inscribed in the protruding portion 11 of the seismic isolation plate E. The sliding bearing 12 and the sliding plate 13 are coated with a fluororesin on the surface in order to smoothly displace during an earthquake.

  A doughnut-shaped thermal expansion refractory material 19 is bonded to the periphery of the sliding material holding piece 12 b on the lower surface of the flange 12 a of the sliding support 12 so as to cover the sliding support 12. The thickness of the thermally expanded refractory material 19 is set so that it does not come into contact with the sliding plate 13 in normal times. The fireproof coating of the pillar 3 is configured to reach the lower end of the side surface of the flange 12a of the sliding support 12.

  The doughnut-like thermally expandable refractory material 19 of this example is obtained by dissolving and kneading butyl rubber, hydrogenated petroleum resin, polybutene, ammonium polyphosphate, ammonium hydroxide, thermally expandable graphite, and calcium carbonate using a kneader. The obtained resin composition is formed into a sheet shape by laminating a laminated sheet made of aluminum foil and glass cloth by calendar molding (trade name: Fiblok, manufactured by Sekisui Chemical Co., Ltd.). And it is set so that when heated to 200 degrees or more, the volume expands 20 times or more.

  The thermal expansion refractory material 19 is displaced following the displacement of the upper structure C when the upper structure C is relatively displaced during the earthquake, and the displacement converges and returns to the initial position. In the event of a fire, the thermal expansion refractory material 19 expands due to heat and can efficiently protect the area below the sliding bearing 12 to which the load of the upper structure is transmitted among the sliding material 12c and the sliding plate 13 from the flame. it can.

  In addition, you may adhere | attach the thermal expansion refractory material 19 so that it may wind around the joining plate 3b of the pillar 3 lower end or the side end surface of the flange 12a other than the lower surface of the flange 12a as mentioned above.

  A sheet-like refractory material 20 is placed in an exposed area of the upper surface of the sliding plate 13 other than the area covered with the thermal expansion refractory material 19 below the sliding support 12. The refractory material 20 is made of the same material as the thermal expansion refractory material 19, and prevents dust from accumulating on the upper surface of the sliding plate 13 during normal times, and protects the upper surface of the sliding plate 13 from flames in the event of a fire. . Since the refractory material 20 is easy to process and is merely placed on the upper surface of the sliding plate 13, it does not require labor. Further, since it is lightweight and flexible, it is easily moved or deformed during an earthquake and does not affect the displacement of the upper structure C (sliding of the sliding bearing). Although there is a possibility that a displacement occurs due to the displacement of the upper structure C at the time of an earthquake, it can be easily returned to a predetermined position because it is only placed on the upper surface of the sliding plate 13.

  The refractory material 20 is not limited to such a sheet-like material that thermally expands at a predetermined temperature, and a refractory coating material (trade name: Makibee, manufactured by Nichias Co., Ltd.) made of mat-like rock wool or the like is applied. And the same effects can be achieved.

  The present invention can be applied not only to seismic isolation devices on intermediate floors but also to seismic isolation devices provided near a general ground surface.

It is a perspective view of a base isolation building to which the base isolation structure according to the present invention is applied. It is sectional drawing of a lower structure mainly of a seismic isolation building. It is a figure which shows the structure around a seismic isolation apparatus. It is a figure which shows the structure around a seismic isolation plate. It is a figure which shows the structure of the fireproof coating | cover structure given to the sliding bearing and sliding board which comprise a seismic isolation apparatus.

A ... Seismic isolation building B ... Lower structure C ... Upper structure D ... Seismic isolation device E ... Seismic isolation plate 1 ... Foundation 1a ... Base beam 1b ... Pressure panel 1c ... Soil concrete 2 ... Cylinder (1st floor pillar)
2a ... Column head 3 ... Column 3a ... Beam joint 3b ... Joint plate 4a-4c ... Large beam 4a1-4c1 ... Joint plate 5a-5c ... Cantilever 5a1-5c1 ... Joint plate 6a-6c ... Nose tip beam 7 ... Outer wall panel DESCRIPTION OF SYMBOLS 8 ... Outer wall 9 ... Floor panel 10 ... Floor 11 ... Protruding part 12 ... Sliding support 12a ... Flange 12b ... Sliding material holding piece 12c ... Sliding material 13 ... Sliding plate 14 ... Restoring rubber 15 ... Oil damper 16 ... Receiving plate mounting part DESCRIPTION OF SYMBOLS 17 ... Peripheral part 17a ... Bolt hole 18 ... Wet fireproof coating material 19 ... Thermal expansion fireproof material 20 ... Fireproof material

Claims (3)

Sliding bearing having a sliding plate which is attached to the lower structure, and a resin or a metal skids mounted to slide an upper surface of the sliding bearing lower surface formed in the upper structure said sliding plate In the type of seismic isolation device,
A seismic isolation device, characterized in that a thermal expansion refractory material that expands in the event of a fire and covers the sliding material is attached in a non-contact state with the sliding plate around the sliding material on the lower surface of the sliding bearing. Fireproof coating structure. The sliding plate is made of plastic or metal, that the exposure area other than the area covered by the thermal expansion refractory material of the upper surface, sheet or mat of refractory material is crack covered is placed The fireproof covering structure for a seismic isolation device according to claim 1, wherein 3. The seismic isolation device according to claim 1, wherein the upper structure is a steel structure, and the thermal expansion refractory material is continuously bonded to a refractory coating material that covers the upper structure. Fireproof coating structure.

Images