JP4964277B2 - Fireproof coating structure for seismic isolation devices - Google Patents

Description

  The present invention provides a fireproof coating for a seismic isolation device for protecting a seismic isolation device interposed between two structures that are spaced apart from each other in the vertical direction and differing in the size of the opposing surfaces to protect them from heat such as a fire. Concerning structure.

  Conventionally, various fireproof covering structures for seismic isolation devices have been proposed that are interposed between two structures that are spaced apart from each other in the vertical direction. For example, in Patent Document 1, a fireproof plate is protruded downward or upward from two structures that are vertically separated so as to surround the periphery of the seismic isolation device. Each fireproof plate can swing in the front-rear direction with respect to the structure via a hinge member, and in this way, the seismic isolation device normally cuts off fire and heat by each fireproof plate. When inspecting the device, it is possible to easily confirm the internal seismic isolation device by opening each refractory material surrounding the seismic isolation device.

  By the way, in such a seismic isolation device, a laminated rubber type seismic isolation device using a laminated rubber bearing constituted by alternately stacking steel plates and rubber, a sliding type seismic isolation device constituted by a sliding plate and a sliding bearing, Various types of seismic isolation devices such as a rolling type seismic isolation device using a rolling bearing have been proposed. The above-mentioned fireproof coating structure described in Patent Document 1 is mainly used for the fireproof coating of laminated rubber type seismic isolation devices. Yes.

  However, when a laminated rubber type seismic isolation device is adopted as the seismic isolation device, the upper and lower structures on which the seismic isolation device is arranged generally have the same size (cross-sectional area). On the other hand, when a slip-type seismic isolation device is used as the seismic isolation device, the plane dimensions of the sliding plate are adjusted so that the sliding plate corresponds to the range of movement of the sliding bearing (the sliding bearing is a cross-sectional view). In general, the diameter (in the case of circular shape) is at least twice the size of the seismic isolation displacement. Many of them are formed larger than the size (cross-sectional area) of the other structure on which the support is provided.

  Therefore, the fireproof covering structure as described in Patent Document 1 is applicable to a seismic isolation device that needs to be disposed between two structures having different sizes, such as this slip-type seismic isolation device. Even if it is applied, the seismic isolation device cannot be sufficiently covered because the sizes of the upper and lower structures are different. Therefore, a fireproof covering structure corresponding to the mismatch of the sizes of the upper and lower structures has also been proposed (see, for example, Patent Document 2).

  In the fireproof covering structure described in Patent Document 2, the slide plate is embedded in the upper end of the lower structure having a large cross-sectional area, and the upper structure having a small cross-sectional area to which the slide support is fixed. A fireproof board is hung so as to surround the sliding bearing. In addition, the lower structure to which the sliding plate is fixed has a refractory blanket laid on the outside of the refractory board on the sliding plate, which covers the periphery of the sliding support with the refractory board. The sliding plate outside the fireproof board is covered with a fireproof blanket.

Utility Model Registration No. 3142272 JP 2008-57228 A

  However, in the fireproof covering structure described in Patent Document 2 described above, if there is a step between the slip plate and the base plate and the concrete, there is a risk that the fireproof blanket may come into contact with the corners of the slip plate due to movement during an earthquake and be damaged. For this reason, it is necessary to bury the sliding plate in the end portion of the structure to make the surface flat, and there is a problem that the construction becomes complicated. In addition, the entire seismic isolation device is covered with fireproofing, but because the fireproof board and fireproof blanket are combined and covered, there is a difference in thermal expansion coefficient at the boundary between the fireproof board and fireproof blanket. Due to the difference, there is a problem that the fire resistance performance is lowered.

  The present invention has been made paying attention to the above-described problem. For example, a seismic isolation device arranged between two structures having different sizes (cross-sectional areas), such as a slip-type seismic isolation device. An object of the present invention is to provide a fireproof covering structure for a seismic isolation device having a simple structure and excellent fireproof performance.

  The fireproof covering structure of the seismic isolation device of the present invention surrounds the periphery of the seismic isolation device interposed between two structures that are separated from each other in the vertical direction and have opposite surface sizes. A horizontal fireproof panel that is horizontally installed so as to surround the outer periphery of the first structure having a smaller size (for example, a cross-sectional area) among the structures, and the seismic isolation device. And a vertical refractory panel vertically arranged to surround the periphery. The vertical refractory panel is a first refractory panel attached along a periphery of a surface of the second structure having a larger size (cross-sectional area) facing the first structure in the structure. And a second refractory panel attached to the horizontal refractory panel so as to face the first refractory panel. The horizontal fireproof panel is fixed to a plurality of first fixing members fixed to the first structure so that no gap is formed between the horizontal fireproof panel and the outer periphery of the first structure. The first fireproof panel is fixed to a plurality of second fixing members fixed to the second structure so that no gap is formed between the first fireproof panel and the facing surface of the second structure. The second refractory panel is fixed to a plurality of third fixing members fixed to the horizontal refractory panel so that no gap is formed between the second refractory panel and the first refractory panel. A slit is formed between the second fireproof panel and the second fireproof panel, and the first fixing member and the third fixing member are arranged in the horizontal fireproof panel so as not to contact each other. Yes.

  According to the fireproof covering structure having the above-described configuration, even if the seismic isolation device is arranged between upper and lower structures having different sizes, the periphery of the seismic isolation device is covered with the vertical fireproof panel. Because the gap between the vertical fireproof panel and the first structure that occurs above or below the seismic isolation device depending on the size of the structure is covered with the horizontal fireproof panel, the entire seismic isolation device is fireproofed only with the fireproof panel. It becomes possible to coat. For this reason, the fireproof coating structure can be made simple, and there is no difference in the coefficient of thermal expansion between the fireproof coating structure as a whole. Compared to conventional fireproof coating structures that combine fireproof panels and fireproof blankets, Performance can be improved.

  In a preferred embodiment of the present invention, the first structure has a rectangular cross-sectional shape, and the horizontal refractory panel has two sheets having a length substantially equal to the width of the first structure. The short refractory panel and two long refractory panels having a length substantially equal to the width of the second structural body are formed in a rectangular shape as a whole by abutting the end faces thereof. Convex portions are formed on both end faces of the short fireproof panel, while concave portions in which the convex portions can be fitted are formed on the end face of the long fireproof panel. It is a feature.

  According to this embodiment, by connecting the refractory panels to each other by so-called actual connection, in the horizontal refractory panel, it is possible to suppress heat from entering the inside through a joint or the like from the outside, The fireproof performance of the fireproof coating structure can be improved.

  In a further preferred aspect of the present invention, the horizontal fireproof panel is arranged such that a bolt protrudes from the horizontal fireproof panel at a fixed position with the first fixing member and the third fixing member. The horizontal refractory panel and the first fixing member are tightened with nuts inserted into and screwed into bolt insertion holes formed in the first fixing member and the third fixing member. The member and the third fixing member are integrated.

  According to this embodiment, the bolt for fixing the horizontal fireproof panel and the first and third fixing members is embedded in the horizontal fireproof panel without penetrating the horizontal fireproof panel. Thus, it is possible to prevent deterioration of the fire resistance performance of the fireproof coating structure without inducing external heat to the inside.

  In a further preferred embodiment of the present invention, a fireproof rubber sheet having a thickness smaller than the width of the slit is attached to the first fireproof panel or the second fireproof panel so as to surround the seismic isolation device. It is characterized by being.

  According to this embodiment, the fireproof rubber sheet is inserted into the slit, so that the fireproof function for the seismic isolation device can be improved.

  According to the present invention, even if the seismic isolation device is arranged between upper and lower structures having different sizes, the fireproof covering structure of the seismic isolation device having a simple configuration and excellent fireproof performance Can be provided.

It is a partially cutaway sectional view of the fireproof covering structure of the seismic isolation device which is one embodiment of the present invention. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is sectional drawing which follows the CC line of FIG. It is sectional drawing which follows the DD line | wire of FIG. It is a perspective view which shows the external appearance of a short fireproof panel and a long fireproof panel. It is a perspective view which shows the external appearance of a 1st fireproof panel.

  Hereinafter, the fireproof covering structure 1 of the seismic isolation apparatus which is one Example of this invention is demonstrated, referring drawings. As shown in FIG. 1, the fireproof covering structure 1 of the seismic isolation device according to the present embodiment is interposed between the upper structure SU and the lower structure SL adjacent to the lower side of the structure SU. This is applied to the seismic isolation device 10 for seismic isolation of buildings. Note that the structures SU and SL in the present embodiment are columns having a rectangular cross section of the building.

  As shown in FIGS. 1 to 3, the seismic isolation device 10 includes a sliding support 11 provided on the upper end surface of the lower structure SL, and a sliding plate 12 provided on the lower end surface of the upper structure SU. It consists of a slip-type seismic isolation device composed of The sliding bearing 11 is a member that reduces building response acceleration due to an earthquake by sliding on the surface of the sliding plate 12, and is composed of an elastic sliding bearing in which a seismic isolation rubber is laminated on a rigid sliding bearing having a cylindrical shape.

  The sliding plate 12 is made of a stainless steel plate having an octagonal shape in plan view, and is attached to a base plate 13 fixed to the lower end surface of the upper structure SU. The sliding plate 12 is formed to have a planar dimension corresponding to the sliding movement range of the sliding support 11, and therefore the plan view dimension of the sliding plate 12 is much larger than that of the sliding support 11. The upper structure SU to which is fixed is larger in size (cross-sectional area) than the lower structure SL to which the sliding bearing 11 is fixed. Here, in this document, hereinafter, the structure SL having the smaller cross-sectional area is referred to as “first structure SL”, and the structure SU having the larger cross-sectional area is referred to as “second structure”. “SU”. In addition, since the above-mentioned sliding type seismic isolation device 10 is a well-known thing, it abbreviate | omits about the detailed description here.

  The fireproof covering structure 1 surrounds the seismic isolation device 10 and protects the seismic isolation device 10 from the heat of the fire. The horizontal fireproof panel 2 that covers the lower area of the seismic isolation device 10, and the seismic isolation device 10 And four vertical fireproof panels 3 covering the side area.

  As shown in FIGS. 2 and 4 to 6, the horizontal fireproof panel 2 has a rectangular shape along the outer shape of the second upper structure SU and the lower first structure. It has the opening part 20 which can face the body SL, and is laid horizontally so that the outer periphery of 1st structure SL may be surrounded. Between the inner peripheral surface of the horizontal fireproof panel 2 and the outer peripheral surface of the first structure SL, a ceramic fiber blanket 14 excellent in fire resistance, heat insulation, and flexibility is used to fill a gap between them. Is interposed. Further, a steel plate 25 (shown in FIG. 6) is attached and covered on the outer peripheral surface and the lower end surface exposed to the outside of the horizontal fireproof panel 2.

  The horizontal fireproof panel 2 of the present embodiment has two short fireproof panels 21 and 21 whose length dimension is substantially equal to the width dimension of the first structural body SL, and the width dimension of the second structural body SU. It consists of two long refractory panels 22 and 22 that are substantially equal in size (see FIG. 6). Each fire-resistant panel 21 and 22 is composed of a glass fiber mixed calcium silicate plate having good fire resistance (incombustibility and heat resistance), heat insulation, and little deterioration over time. Each of the refractory panels 21 and 22 is formed by vertically stacking and integrally bonding four calcium silicate plates.

  Each fireproof panel 21 and 22 is connected by what is called actual connection. At both ends of the short fireproof panel 21, projections 23 and 23 for insertion are provided. On the other hand, concave portions 24 and 24 into which the convex portions 23 can be fitted are formed at both end positions of the inner side surface of the long fireproof panel 22, and the short shapes are formed so that the convex portions 23 fit into the concave portions 24. The horizontal fireproof panel 2 is formed by abutting the fireproof panel 21 against the long fireproof panel 22.

  Thus, by connecting each fireproof panel 21 and 22 by actual connection, in the back surface of the horizontal fireproof panel 2, the penetration | invasion of the heat from a joint can be suppressed and fireproof performance can be improved. In addition, in FIG. 6, 25 is the said galvanized steel plate stuck so that the outer periphery of the horizontal fireproof panel 2 might be surrounded.

  The horizontal fireproof panel 2 formed in this way includes a first fixing member 40 disposed at one central position of the upper end surface of the long fireproof panel 22 and two end portions of the upper end surface of the short fireproof panel 21. The first fixing member 41 is fixed to the first structural body SL. The 1st fixing member 40 is comprised with the angle material which bent the sheet metal into the L shape, and is arrange | positioned so that the upper end surface of the elongate fireproof panel 22 and the outer peripheral surface of the 1st structure UL may be followed. Yes. The surface of the first fixing member 40 on the side in contact with the first structural body SL is bolted to a screw hole 45 (shown in FIG. 5) on the outer peripheral surface of the first structural body SL. The member 40 is attached and fixed to the first structure SL.

  The second fixing member 41 includes an L-shaped bottom plate portion 41 a and an L-shaped side plate portion 41 b in plan view, and the bottom plate portion 41 a is along the upper end surface of the short fireproof panel 21. Is arranged. The surface of the L-shaped side plate portion 41b on the side in contact with the first structure SL is bolted to the outer peripheral surface of the first structure SU in the same manner as the first fixing member 40, whereby the second fixing member 41 is fixedly attached to the first structure SL.

  In FIG. 2, 42 is a third fixing member made of an angle material obtained by bending a sheet metal into an L-shape, like the fixing member 40 described above, and the upper end surface of the long fireproof panel 22 and the second fixing member. It is arrange | positioned at two edge parts of each elongate fireproof panel 22 so that the L-shaped side-plate part 41b of the fixing member 41 of this may be followed. The third fixing member 42 is configured such that the surface of the second fixing member 41 on the side in contact with the L-shaped side plate portion 41 b is bolted to the L-shaped side plate portion 41 b so that the third fixing member 42 is interposed via the second fixing member 41. 1 structure UL.

  Nuts 44 are embedded in the positions where the fixing members 40, 41, 42 of the fireproof panels 21, 22 are arranged. Each fixing member 40, 41, 42 is formed with a bolt insertion hole 43 (shown in FIG. 5) at a position corresponding to the nut embedding position of each fireproof panel 21, 22. The anchor bolts 4 to be screwed together are inserted from above and screwed into the nuts 44, whereby the fireproof panels 21, 22 are integrated with the first structure UL via the fixing members 40, 41, 42. .

  The anchor bolts 4 are embedded at the positions where the fixing members 40, 41, 42 of the fireproof panels 21, 22 are arranged so that the heads protrude from the upper end surfaces of the fireproof panels 21, 22, respectively. The anchor bolts 4 are inserted into the bolt insertion holes 43 of the fixing members 40, 41, and 42, and the head portions thereof are tightened with nuts 44 that are screwed together so that the fireproof panels 21 and 22 are integrated with the first structure UL. You may comprise so that it may become.

  Each of the vertical fireproof panels 3 includes four upper first fireproof panels 30 covering the upper side of the seismic isolation device 10 and four lower second fireproof panels 31 covering the lower side. It is composed of

  As shown in FIGS. 3 to 5 and FIG. 7, the upper first fireproof panel 30 surrounds the seismic isolation device 10 so as to surround the lower end surface (first structure) of the upper second structure SU. It is arranged along each side of the surface facing the UL. Both side end surfaces 30A, 30A of each first fireproof panel 30 are inclined surfaces, and are connected without causing a gap by abutting the side end surfaces 30A of the adjacent first fireproof panels 30. Each of the first fireproof panels 30 is attached and fixed to the lower end surface of the second structure SU by upper fixing members 32 disposed at the four corners of the second structure SU. In addition, the steel plate 33 is stuck and coat | covered on the upper end surface of the 1st fireproof panel 30, a lower end surface, and an outer side surface.

  The upper fixing member 32 has a configuration in which an L-shaped side surface portion 32a is suspended from the periphery of a flat flat surface portion 32a, and the flat surface portion 32a is bolted to the lower end surface of the second structural body SU. Are attached and fixed to the second structure SU. In addition, you may comprise so that the upper fixing member 32 may be attached and fixed to 2nd structure SU by bolting the plane part 32a to the lower end surface of the base board 13 of the seismic isolation apparatus 10. FIG.

  The L-shaped side surface portion 32a of the upper fixing member 32 is abutted against the inner surfaces of the two adjacent first fireproof panels 30, and each first fireproof panel 30 is adjacent to the side end surface 30A thereof. In a state of being abutted against the side end face 30 </ b> A of the fireproof panel 30, it is integrated with the second structure SU by being bolted to the side face part 32 b of each upper fixing member 32.

  A ceramic fiber blanket 15 is interposed between the side surface portion 32b of each upper fixing member 32 and each first fireproof panel 30 in order to fill a gap between them. Further, a ceramic fiber blanket 16 is interposed between each first fireproof panel 30 and the second structure SU in order to eliminate a gap due to unevenness of the end face of the second structure SU.

  As shown in FIGS. 2, 4, and 5, the lower second fireproof panel 31 surrounds the seismic isolation device 10 so as to surround the upper end surface of the horizontal fireproof panel 2 (with the second structural body SU). It is arranged along each side of the (opposite surface). Similarly to the first fireproof panel 30, each second fireproof panel 31 has both end surfaces 31A inclined, and by abutting the side end surfaces 31A of the adjacent second fireproof panels 31, They are connected without any gaps. In addition, the structure of the 2nd fireproof panel 31 is as substantially the same as the structure of the 1st fireproof panel 30 shown in FIG. 7, and illustration is abbreviate | omitted here.

  Each second fireproof panel 31 is attached and fixed to the upper end surface of the horizontal fireproof panel 2 by a plurality of (eight in this embodiment) lower fixing members 33 fixed to the horizontal fireproof panel 2. The lower fixing member 33 is spaced apart from the first to third fixing members 40 to 42 fixed to the horizontal fireproof panel 2 so as not to be in direct contact with each side of the horizontal fireproof panel 2. The L-shaped side surface portion 33b is erected from the periphery of the flat lower surface portion 33a along the upper end surface of the horizontal fireproof panel 2 (respective fireproof panels 21, 22). The lower fixing member 33 at the four corners has two surfaces of the L-shaped side portion 33b, and the other lower fixing member 33 has one surface of the L-shaped side portion 33b on the inner surface of the second fireproof panel 31. It is faced.

  Nuts 44 are respectively embedded in positions corresponding to the lower surface portions 33a of the lower fixing members 33 of the horizontal fireproof panels 2 (respective fireproof panels 21, 22). Bolt insertion holes 43 (shown in FIG. 5) are formed in the lower surface portion 33a of each lower fixing member 33, and anchor bolts 4 that are screwed into the nuts 44 are inserted into the bolt insertion holes 43 from above. Each lower fixing member 33 is fixed on the horizontal fireproof panel 2 by being screwed into 44.

  Each second fireproof panel 31 is bolted to the side surface portion 33b of each lower fixing member 33 in a state where the side end surface 31A is abutted with the side end surface 31A of the adjacent second fireproof panel 31 so that the horizontal end surface 31A is horizontal. It is integrated with the fireproof panel 2. A ceramic fiber blanket 17 is interposed between the side surface portion 33b of each lower fixing member 33 and each second fireproof panel 31 so as to fill a gap between them. A ceramic fiber blanket 18 is also interposed between each second fireproof panel 31 and the horizontal fireproof panel 2.

  The upper end surface of each lower second fireproof panel 31 and the lower end surface of each upper first fireproof panel 30 are opposed to each other, and a slit P is formed therebetween. A fire-resistant rubber sheet 19 is inserted into the slit P, and is bonded to the lower end surface of each upper first fire-resistant panel 30 so as to surround the seismic isolation device 10. This fire-resistant rubber sheet 19 has a flame barrier property and a heat barrier property, and also has a thermal expansion property. For example, “JIC Tiker Tape EP-HD” (trade name) manufactured by Nippon Insulation Co., Ltd. can be used. .

  A gap Q is formed between the lower surface of the refractory rubber sheet 19 and the upper end face of each second refractory panel 31, and the gap Q allows the refractory rubber sheet 19 and the Each 2nd fireproof panel 31 does not contact.

  In addition, a fireproof sponge (not shown) can be arranged in parallel at the inner position of the fireproof rubber sheet 19 on the lower end surface of each first fireproof panel 30. In this case, the lower end of the fireproof sponge is brought into contact with the upper end surface of each second fireproof panel 31, and the slit P is closed by the fireproof sponge. Such a fire-resistant sponge is flame- and heat-insulating and has a thermal expansion property, and can be obtained by blending a resin component such as urethane foam with an inorganic filler such as expandable graphite, For example, “JIC Taika Block EP-HD” (trade name) manufactured by Nippon Insulation Co., Ltd. can be used. By providing this fireproof sponge, it is possible to improve the fireproof performance of the fireproof coating structure 1 and to prevent the entry of dust and the like into the interior.

  According to the fireproof covering structure 1 having the above-described configuration, even if the seismic isolation device 10 is disposed between the upper and lower structures SU and SL having different sizes, the side periphery of the seismic isolation device 10 is The vertical fireproof panel 3 and the first structural body UL (the size of the cross-sectional area is the same as that of the vertical fireproof panel 3 and generated below (or above) the seismic isolation device 10 due to the difference in the sizes of the structures SU and SL. Since the gap between the small structure and the horizontal structure is covered with the horizontal fireproof panel 2, the entire seismic isolation device 10 can be fireproofed only with the fireproof panel. Therefore, the fireproof covering structure 1 can be a simple structure, and since there is no difference in the coefficient of thermal expansion as the entire fireproof covering structure 1, compared with a conventional fireproof covering structure combining a fireproof panel and a fireproof blanket. , Fireproof performance can be improved.

  Moreover, since the horizontal fireproof panel 2 has a structure in which the four fireproof panels 21 and 22 are closely connected by actual connection, the structural strength of the connecting portion can be improved and the horizontal fireproof panel 2 can be improved. In the back surface of this, it can suppress that a heat | fever penetrate | invades through the joint etc. from the outside, and can prevent the fall of the fireproof performance in a connection part.

  Further, the anchor bolt 4 that fixes the horizontal fireproof panel 2 and the first to third fixing members 40 to 42 is embedded in the horizontal fireproof panel 2 without one end portion penetrating the horizontal fireproof panel 2. The anchor bolt 4 becomes a thermal bridge and does not induce heat outside the fireproof coating structure 1 to the inside, so that the fireproof performance is not deteriorated.

  In addition, the first to third fixing members 40 to 42 (fixing the horizontal fireproof panel 2 and the structural body SL) fixed on the horizontal fireproof panel 2 and the lower fixing member 33 (the horizontal fireproof panel 2 and the second fireproof panel 2). Are fixed at intervals without being contacted (integrated) with each other, so that deformation due to thermal expansion of each of the fixing members 33 and 40 to 42 at the time of a fire is suppressed as much as possible. It is possible to suppress the horizontal fireproof panel 2 from falling off due to the deformation of the horizontal fireproof panel 2 and the joint opening, as well as the reduction of the fixing force such as the removal of the stopper.

  In the above embodiment, the fireproof covering structure of the seismic isolation device in the case where the upper structure SU is larger in size (cross-sectional area) than the lower structure SL has been described. It goes without saying that the fireproof covering structure can also be applied to the case where the lower structure SL is larger in size (cross-sectional area) than the upper structure SU.

  In this case, the refractory coating structure is configured to be upside down from the above-described embodiment. That is, the horizontal fireproof panel 2 is installed horizontally so as to surround the outer periphery of the upper structure SU, and the vertical fireproof panel 3 is placed horizontally so that the upper first fireproof panel 30 surrounds the seismic isolation device 10. It arrange | positions along each edge | side of the lower end surface (facing surface of lower structure SL) of the refractory panel 2, and the lower 2nd refractory panel 31 is placed on the lower side so as to surround the seismic isolation device 10. It arrange | positions along each edge | side of the upper end surface (facing surface of upper structure SU) of structure UL.

  Moreover, in the above-described embodiment, the fireproof covering structure according to the present invention is applied to the seismic isolation device interposed between the pillars having a rectangular cross section of the building, but the invention is not limited thereto. You may apply to the seismic isolation apparatus interposed between circular support | pillars. In this case, the horizontal fireproof panel 2 may be configured in a circular shape in plan view, and the first and second fireproof panels 30 and 31 of the vertical fireproof panel 3 may be configured in an arc shape. Moreover, you may apply to the seismic isolation apparatus etc. which were provided between the support | pillar of a building, and the foundation other than the seismic isolation apparatus interposed between the support | pillars of a building.

DESCRIPTION OF SYMBOLS 1 Fireproof covering structure 2 Horizontal fireproof panel 3 Vertical fireproof panel 4 Anchor bolt 10 Seismic isolation device 19 Fireproof rubber sheet 21 Short fireproof panel 22 Long fireproof panel 23 Convex part 24 Concave part 30 1st fireproof panel 31 2nd fireproof panel 32 Upper fixing member 33 Lower fixing member 43 Bolt insertion hole 44 Nut 40-42 Fixing member SL First structure SU Second structure

Claims (4)

A fireproof covering structure for a seismic isolation device that is interposed between two structures that are spaced apart from each other in the vertical direction and have different sizes of opposing surfaces,
A horizontal fireproof panel horizontally installed so as to surround the outer periphery of the first structure having a smaller size among the structures, and a vertical fireproof panel vertically provided so as to surround the periphery of the seismic isolation device. And
The vertical refractory panel includes a first refractory panel attached along a periphery of a surface facing the first structure of the second structure having a larger size among the structures; A second refractory panel attached to the horizontal refractory panel so as to face the first refractory panel;
The horizontal fireproof panel is fixed to a plurality of first fixing members fixed to the first structure so that no gap is formed between the horizontal fireproof panel and the outer periphery of the first structure,
The first fireproof panel is fixed to a plurality of second fixing members fixed to the second structure so that no gap is formed between the first fireproof panel and the facing surface of the second structure. The second refractory panel is fixed to a plurality of third fixing members fixed to the horizontal refractory panel so that no gap is formed between the second refractory panel and the first refractory panel. And a slit between the second fireproof panel,
The fireproof covering structure for a seismic isolation device, wherein the first fixing member and the third fixing member are arranged on the horizontal fireproof panel so as not to contact each other. The first structure has a rectangular cross-sectional shape,
The horizontal fireproof panel includes two short fireproof panels having a length substantially equal to the width of the first structure, and two long fireproof panels having a length substantially equal to the width of the second structure. It is composed of a rectangular shape as a whole by butting its end faces together,
Convex portions are formed on both end faces of the short fireproof panel, and concave portions in which the convex portions can be fitted are formed on the butted end faces of the long fireproof panel. The fireproof covering structure for a seismic isolation device according to claim 1.   In the horizontal fireproof panel, a bolt is embedded in a fixing position with the first fixing member and the third fixing member such that a screw head protrudes from the horizontal fireproof panel, and the bolt is embedded in the horizontal fireproof panel. The horizontal fireproof panel, the first fixing member, and the third fixing member are integrated by tightening with a nut that is inserted into a bolt insertion hole formed in the first fixing member and the third fixing member and screwed. The fireproof covering structure for a seismic isolation device according to claim 1 or 2, wherein the structure is fireproof.   The fireproof rubber sheet having a thickness smaller than the width of the slit is attached to the first fireproof panel or the second fireproof panel so as to surround the seismic isolation device. The fireproof covering structure of the seismic isolation device according to any one of 3

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