JP4097849B2 - Wall fireproof structure of seismic isolation building - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wall fireproof structure of a seismic isolation building in which a seismic isolation device is interposed between an upper frame and a lower frame of a horizontally divided building.
[0002]
[Prior art]
In order to introduce an earthquake-resistant structure into an existing building, the building is horizontally separated and divided into an upper and lower frame, and a thin plate-like structure is placed between the upper and lower columns of the upper and lower frames. There is a seismic isolation device in which rubber plates and metal plates are stacked alternately, reducing the natural seismic intensity of the building and attenuating the vibration of the building during an earthquake to improve safety. It is well known.
[0003]
In such a base-isolated building, a part of the frame such as a wall and a beam surrounding the base isolation device interposed between the columns of the upper and lower frames is divided in the horizontal direction together with the columns. , Spaced apart with a gap above and below. In such a gap, since it is necessary to give the seismic isolation device the same fire resistance as the column, between the wall of the upper frame and the wall of the lower frame surrounding the outside of the seismic isolation device, There is a refractory belt in which fluffy refractory fibers such as ceramic felt and rock wool felt are encased by a metal thin film such as stainless steel. In order to allow relative displacement between the upper and lower enclosures due to earthquakes or ground subsidence, this fireproof zone has the upper and lower end parts loosened in the middle between the upper and lower ends. It fixes to each opposing peripheral part of the pillar of the upper-layer housing | casing which surrounds a seismic isolation apparatus, and the pillar of a lower-layer housing | casing using a metal fixing ring or a locking pin.
[0004]
With such a configuration, the relative displacement between the upper and lower housings is allowed, and flames are prevented from entering the space inside the fireproof zone where the seismic isolation device is installed from the outside. Similar conventional techniques are shown in Japanese Patent Application Laid-Open Nos. 9-268670 and 10-299285, for example.
[0005]
[Problems to be solved by the invention]
In such a conventional technique, since the fireproof belt is fixed to the upper and lower pillars with the middle portion between the upper and lower ends thereof being loosened, the relative displacement between the upper and lower housings is reduced. If the amount of slack of the fireproof zone is exceeded, the fireproof zone is easily broken, and a predetermined fireproof performance cannot be achieved. In addition, since this refractory belt has a flexible mat shape, when the refractory belt is attached to the upper and lower pillars by a metal fixing ring or a locking pin, the refractory belt must be held by hand at the mounting position. There is a problem that fixing work takes time and workability at the time of installation is poor.
[0006]
The object of the present invention is to make it easy to attach a fireproof zone, to allow large relative displacement between the upper and lower housings, to reliably close the air gap, and to achieve reliable fireproof performance. It is to provide building wall fireproof structure.
[0007]
[Means for Solving the Problems]
The present invention, in a seismic isolation building in which a seismic isolation device is interposed between the upper and lower housings of a horizontally divided building,
An edge member having a hinge portion is fixed to the wall of the upper frame, and the edge member is rotatably held by the hinge portion, and a spring is attached in a direction in which the lower end portion is close to the wall of the lower layer precursor. Providing a biased cover plate to cover the gap between the walls of the upper and lower housings;
In the gap, a long refractory belt is provided that allows relative displacement between the upper and lower casings and is stretchable in the thickness direction to close the gap.
A holder made of metal having a concave cross section with a space in the longitudinal direction is fixed to the fireproof zone so as to project the sliding portion of the fireproof zone facing the wall of the lower casing or the wall of the upper casing. ,
An attachment member made of metal is connected to the holder, and the attachment member is configured such that the refractory belt has the sliding portion in contact with the wall of the lower housing or the wall of the upper housing, or the wall or lower layer of the upper housing. It is a wall fireproof structure of a base-isolated building characterized by being fixed to the wall of the frame.
[0008]
According to the present invention, in the base-isolated building, the edge member is fixed to the wall of the upper frame, and the cover plate is rotatably held by the hinge part on the edge member, and the lower end of the cover plate is the lower frame. The spring is biased in the direction close to the wall. In addition, a long and stretchable fireproof belt is provided between the upper and lower housings, and the upper and lower housings are allowed to allow relative displacement between the upper and lower housings. The gap between each wall is closed. In such a refractory belt, a metal holder having a concave cross-sectional shape, for example, a steel holder is fixed in a state where the sliding portion protrudes, and an attachment member made of metal is connected to the holder. The
[0009]
In such a configuration, when mounting the fireproof zone in the gap between the walls of the upper and lower casings, the mounting member is in a state where the sliding portion of the fireproof zone is in contact with the wall of the lower or upper casing. Is fixed to the wall of the upper-layer casing or the wall of the lower-layer casing opposite to the one wall with which the sliding portion contacts.
[0010]
In this way, the edge layer is fixed to the upper layer along the gap, and the cover plate that is rotatably held by the hinge portion of the edge member is provided to cover the fire zone, so that the fire zone is protected. Thus, it is possible to prevent damage and more reliably prevent the flame from entering. In addition, by providing a fire-resistant zone in the gap, in the state fixed to the wall of the upper frame or the wall of the lower frame as described above, the wall of the frame opposite to the wall of the fixed frame is fixed. Even if the upper and lower housings are relatively displaced due to an earthquake or ground subsidence, the shape of the refractory zone is greatly deformed, so that no gaps are formed between the opposing housing walls and the air gaps are reliably closed. In this state, the relative displacement between the respective bodies can be allowed.
[0011]
In addition, as described above, the refractory zone is fixed to either the wall of the upper frame or the wall of the lower frame, so that it is possible to avoid interference with either of them, and thereby a large displacement between the upper frame and the lower frame. Can be tolerated. In addition, since the retainer and the mounting member are made of metal, for example, steel, it is possible to reliably prevent a problem of being deformed by high heat at the time of a fire or being melted down and flowing down, thereby realizing a highly reliable fireproof structure. be able to.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a vertical sectional view showing a wall fireproof structure of a base-isolated building according to an embodiment of the present invention, and FIG. 2 shows a fireproof belt 1, a holder 2 and mounting members 3a and 3b shown in FIG. FIG. 3 is an exploded perspective view, and FIG. 3 is a horizontal sectional view of the partition wall 4 in which the expansion / contraction fireproof structure shown in FIGS. 1 and 2 is implemented and the vicinity of the seismic isolation device 5 surrounded by the partition wall 4. FIG. 1 shows an enlarged cross section as viewed from the section line III-III in FIG.
[0013]
In order to make the existing building a seismic isolation structure, the building is horizontally divided and divided into an upper-layer housing 6 and a lower-layer housing 7, and between these upper-layer housing 6 and the lower-layer housing 7, and thus the columns of the upper-layer housing 6. A seismic isolation device 5 is interposed between 8 and the pillar 9 of the lower frame 7. This seismic isolation device 5 is a substantially right circular cylindrical structure having a vibration absorbing portion in which thin flat rubber plates and metal plates are alternately stacked. The vibration transmitted to the upper-layer housing 6 is damped so that the natural frequency of the entire building can be reduced.
[0014]
The seismic isolation device 5 and the pillars 8 and 9 are surrounded so as to surround the seismic isolation device 5 with flames or the like with an interval ΔL1 of about 500 mm outward from the pillars 8 and 9 on the entire circumference. In order to protect from the above, a partition wall 4 is provided. The partition wall 4 includes a plurality of precast concrete panels (also referred to as “PC panels”) 11.
[0015]
As described above, such a partition wall 4 is separated into an upper wall portion 12 connected to the upper-layer housing 6 and a lower wall portion 13 connected to the lower-layer housing 7 so as to have a seismic isolation structure. A gap 14 is interposed between the lower wall portion 13 and the lower wall portion 13. The lower surface 15 facing the lower side of the upper wall portion 12 is roughened by a suspension, and the upper surface 16 facing the upper side of the lower wall portion 13 is formed in a horizontal flat surface shape so that the refractory belt 1 can slide. Has been. The gap 14 is interposed between the lower surface 15 and the upper surface 16.
[0016]
The refractory zone 1 is disposed in the gap 14. This refractory belt 1 is a long material having a rectangular section that is long in the horizontal direction, in which a refractory material 21 made of ceramic fiber is packed by an envelope sheet 22 made of a stainless steel foil film. 14 is provided over the entire circumference in the circumferential direction. A holder 2 made of a metal having a concave cross section perpendicular to the longitudinal direction is fixed to the upper part of such a refractory belt 1 with an adhesive.
[0017]
The holder 2 is a short material having a width B of about 30 to 60 mm, and is fixed in the longitudinal direction of the refractory zone 1 with an interval of about 300 mm, for example, and covers the upper surface of the refractory zone 1; The upper cover portion 24 has a pair of flange portions 25a and 25b that are bent at a right angle downward from both ends in the width direction of the upper cover portion 24, that is, the left and right directions in FIG. Bolt insertion holes 27a and 27b through which the shaft portion of the bolt 26 is inserted are formed in the flange portions 25a and 25b, respectively. Such a holder 2 is made of, for example, steel, which is a metal, and can extend and contract by projecting downward a sliding portion 39 that occupies about 1/3 of the entire cross section facing the lower wall portion 13 of the lower casing 7. In the state, it is fixed and held in the remaining approximately 2/3 region.
[0018]
A pair of plate-like attachment members 3a and 3b are provided on both sides of the flange portions 25a and 25b of the holder 2. Each attachment member 3a, 3b consists of a metal, and steel is used as this metal. Guide long holes 29a and 29b extending in the longitudinal direction are formed near one end in the longitudinal direction of each mounting member 3a and 3b. In addition, circular bolt insertion holes 30a and 30b are formed near the other longitudinal ends of the mounting members 3a and 3b, respectively.
[0019]
The bolt 26 is inserted through the guide long hole 29a of one mounting member 3a, further through the bolt insertion hole 27a of one flange portion 25a of the holder 2, and the fireproof belt 1 is connected from one end in the width direction to the other end. After the insertion, the bolt insertion hole 27b of the other flange portion 25b of the holder 2 and the guide long hole 29b of the other mounting member 3b are inserted and protruded. The mounting members 3a and 3b are erected along the longitudinal direction of the refractory zone 1 and the erection position substantially perpendicular to the evacuation position 1 on the refractory zone 1 to which the holder 32 is fixed. It is connected so as to be angularly displaceable over the position.
[0020]
In mounting the refractory belt 1 to which the mounting members 3a and 3b and the holder 2 are mounted in the space 14, the inner wall 33 facing the pillar 8 and the inner surface 33 facing the column 8 are disposed on the upper wall 12 of the upper casing 6. The end surfaces are exposed from the outer surface 34, the anchor bodies 35a and 35b are embedded in the upper wall portion 12 in advance, and the mounting members 3a and 3b are disposed at the retracted positions, that is, do not protrude from the upper surface of the fireproof belt 1. The fireproof zone 1 is disposed in the gap 14 together with the holder 2 and the mounting members 3a and 3b. In this state, the lower surface of the refractory zone 1 is mounted on the upper surface 16 of the lower wall portion 13 and is in surface contact. Next, the mounting members 3a and 3b are raised at the mounting position, and the anchor bolts 36a and 36b are inserted into the head fitting holes 50 and the bolt insertion holes 30a and 30b of the edge member 41, which will be described later. Screwed onto 35a and 35b.
[0021]
In this way, after the refractory zone 1 is fixed to the upper wall portion 12 together with the edge member 41, the space between the refractory zone 1 and the lower surface 15 of the upper wall portion 12 and the upper cover portion 24 and the upper portion of the holder 2 are arranged. The space between the lower surface 15 of the wall portion 12 is filled with a refractory sealing material 37 made of ceramic felt or rock wool felt to close the gap, and thus the gap 14 is closed by forming a refractory structure.
[0022]
In this state, even if the upper-layer casing 6 and the lower-layer casing 7 are displaced in directions that are relatively close to / separated from each other in the vertical direction in FIG. The upper and lower displacements are allowed, and the state in which the upper and lower displacements are constantly pressed against the upper surface 16 of the lower wall portion 13 can be maintained.
[0023]
Even if the upper casing 6 and the lower casing 7 are displaced relative to each other in the front-rear direction perpendicular to the paper surface of FIG. 1, the refractory belt 1 has the upper surface 16 of the lower wall portion 13 processed into a flat shape as described above. It is possible to allow relative displacement in the front-rear direction of the respective casings 6 and 7 in a state where the gap 14 is closed by sliding on the top.
[0024]
Further, even if the upper-layer housing 6 and the lower-layer housing 7 are displaced in a direction that is relatively displaced in the left-right direction in FIG. 1, the refractory belt 1 is placed on the upper surface 16 of the lower wall portion 13 in the left-right direction in FIG. By sliding in the direction, the gap 14 can be kept closed, and the lateral displacement of each of the housings 6 and 7 can be allowed.
[0025]
FIG. 4 is a partially cutaway perspective view showing an attachment state of the edge member 41, the cover plate 56, and the water return cover body 73. Referring also to FIGS. 1 to 3, among the mounting members 3 a and 3 b described above, the mounting member 3 a disposed on the outside side, that is, the left side in FIG. 1, has a longitudinal direction perpendicular to the paper surface of FIG. 1. An elongated edge member 41 that extends is fixed by the bolt 26.
[0026]
The edge member 41 includes a flat substrate 43 in which bolt insertion holes 42 through which the shaft portions of the bolts 26 are inserted are spaced apart in the longitudinal direction perpendicular to the paper surface of FIG. 1, and the upper end of the substrate 43 in FIG. 1 and a positioning projection 44 projecting to the left side in FIG. 1, and a generally L-shaped projecting projecting outward from an intermediate portion between both ends of the substrate 43 in the vertical direction in FIG. A supporting part 45, a water return piece 46 that protrudes outward from the lower end of the substrate 43, and is spaced upward from the upper surface 16 of the lower wall part 13 in the attached state shown in FIG. 46, and a spring locking piece 47 integrally formed to protrude upward from an intermediate portion between the free end portion and the base end portion.
[0027]
A screw hole 49 into which a screw 48 is screwed is formed near the upper end of the substrate 43 where the positioning protrusion 44 is formed. Below the screw hole 49, a head fitting hole 50 is formed in which the head of the anchor bolt 36a is fitted at the same interval as the anchor body 35a in the longitudinal direction perpendicular to the paper surface of FIG. . The anchor bolt 36a is realized by a countersunk screw bolt in the present embodiment, and is embedded in the same plane as the substrate 43 in a state where the head of the anchor bolt 36a is fitted in the head fitting hole 50. , And so as not to protrude from the substrate 43.
[0028]
The support portion 45 includes a protruding portion 51 that is inclined downward from the substrate 43 toward the outside, that is, the left side in FIG. 1, a rising portion 52 that is bent upward from the free end portion of the protruding portion 51, and a rising portion 52 It has a substantially semi-cylindrical hinge portion 53 protruding from the upper end portion of the portion 52 toward the substrate 43 side. The outer peripheral surface of the hinge portion 53 forms a part of a right cylindrical surface. The hinge portion 53 is formed with a plurality of pin holes 55 into which knock pins 54 are fitted at intervals in the longitudinal direction. When the knock pins 54 are fitted in the pin holes 55, the upper ends of the knock pins 54 slightly protrude upward from the outer peripheral surface of the hinge portion 53.
[0029]
In such a hinge portion 53, the base end portion 57 of the cover plate 56 is rotatably fitted and held. The base end portion 57 has an inner peripheral surface forming a part of a right cylindrical shape, and can be angularly displaced in the directions of the arrows A1 and A2 with the central axis 62 of the hinge portion 53 as a rotation center.
[0030]
The free end portion 63 of the cover plate 56 is integrally formed with a fitting groove portion 64 having a substantially C-shaped cross section protruding toward the lower wall portion 13, and the fitting groove portion 64 is flexible. A packing 65 made of a material having elasticity and elasticity, for example, chloroprene rubber is fitted. The packing 65 elastically contacts the outer surface 66 of the lower wall portion 13 in a state where the cover plate 56 hangs substantially parallel to the upper wall portion 12 and the lower wall portion 13 as shown in FIG. .
[0031]
The base end portion 57 of the cover plate 56 is also formed with a long hole 67 into which the head of the knock pin 54 is fitted. The long holes 67 allow the cover plate 56 to be angularly displaced in the directions of the arrows A1 and A2 and prevent displacement in the longitudinal direction perpendicular to the paper surface of FIG. When a relative displacement in the vertical front-rear direction occurs, the edge member 41, and thus the upper case member 6 to which the edge member 41 is attached, is displaced following the edge member 41. When a relative displacement occurs in the direction, it can be angularly displaced in the directions of arrows A1 and A2, and this lateral displacement can be allowed. Therefore, even when a displacement in the oblique direction in which the displacements in the front-rear direction and the left-right direction perpendicular to the paper surface of FIG. 1 are combined, the arrow A1 is generated without causing a displacement with respect to the edge member 41 in the front-rear direction. , A2 can be angularly displaced, and the horizontal displacement between the housings 6 and 7 can be allowed reliably and smoothly.
[0032]
In such a cover plate 56, the lower end portion 63 is brought close to the lower wall portion 13 by the anti-vibration spring 68 in order to keep the space 14 where the refractory zone 1 is arranged from the outside. The spring is biased in the direction, that is, in the direction of the arrow A2. One end of the anti-vibration spring 68 is locked to a spring locking piece 69 provided on the inner surface of the cover plate 56 near the base end 57, and the other end is spring-locked provided to the edge member 41. Locked to the piece 47. The cover plates 56 as described above are connected in the longitudinal direction by a connecting plate 70 called a joiner in the longitudinal direction perpendicular to the paper surface of FIG.
[0033]
A drain cover body 73 is fixed to the upper portion of the edge member 41 by the screws 48. The drainage cover body 73 is in surface contact with the upper portion of the edge member 41, is positioned in parallel with the upper edge portion of the edge member 41 by the positioning projection 44, and has a screw hole 74 through which the shaft portion of the screw 48 is inserted in the longitudinal direction. 1, a cover portion 76 that is bent and connected from the lower end of the mounting portion 75 to the outside, that is, the left side in FIG. 1, and is bent downward from the tip of the cover portion 76. A series of bent portions 77, and a pair of ridge portions 78a, 78b that protrude downward from the lower surface of the cover portion 76 and elastically press the base end portion 57 of the cover plate 56 fitted to the hinge portion 53 from above. Have
[0034]
By these protrusions 78a and 78b, the base end portion 57 of the cover plate 56 is elastically pressed from above, in other words, toward the hinge portion 53. Even if the relative displacement suddenly occurs in the front-rear direction, it can be prevented from coming off the hinge portion 53. Such a drain cover body 73 is an extruded profile made of an aluminum alloy. The cover plate 56 is also an extruded shape made of an aluminum alloy. As shown in FIG. 3, these cover plates 56 are also provided on the upper wall portion 12 over the entire circumference in the circumferential direction.
[0035]
Such a cover plate 56 can prevent the flame from entering in advance before the flame comes into direct contact with the fireproof zone in the event of a fire, and protects the fireproof zone 1 itself. It is possible to prevent damage from debris and achieve a certain fireproof performance.
[0036]
According to the above configuration, in the base-isolated building, the elongate fire-resistant zone 1 is provided between the upper-layer housing 6 and the lower-layer housing 7, and the upper-layer housing 6 and the lower-layer housing are formed by the fire-resistant zone 1. The air gap 14 between the walls 12 and 13 of the upper-layer housing 6 and the lower-layer housing 7 is closed so that the relative displacement between the seven housings 7 can be allowed. Such a refractory zone 1 is fixed to the wall 13 of the housing 7 on the opposite side to the wall of the housing 7 on the side opposite to the wall of the upper housing 6 in the state where it is fixed to the wall 12 of the upper housing 6 as described above. Even if it is relatively displaced due to ground subsidence or the like, it is possible to maintain a certain fire resistance without causing a large deformation and a gap.
[0037]
Further, as described above, since the fireproof zone 1 is fixed to the wall 12 of the upper layer casing 6, it can be displaced without limitation with respect to any one of the other layers 12, and thereby a large displacement between the upper layer casing 6 and the lower layer casing 7 is achieved. Can be tolerated. And since the said holder 2 and each attachment member 3a, 3b consist of a metal with high fire resistance, for example, steel, it deform | transforms by the high heat at the time of fire occurrence, or prevents the malfunction of being melted and flowing down reliably, A highly reliable fireproof structure can be realized.
[0038]
FIG. 5 is an exploded perspective view showing a stretchable fireproof structure for a seismic isolation building according to another embodiment of the present invention. In the present embodiment, instead of the bolt 26, the washer 31, and the nut 32, an insertion fixing metal fitting 81 is used. The insertion fixture 81 is made of steel, which is a metal having high fire resistance, and is formed at a right angle to a thin plate-like insertion portion 82 that is inserted through the fireproof zone 1 in the width direction, and one longitudinal end of the insertion portion 82. A bent portion 83 that is bent continuously and a tapered puncture portion 84 that is integrally formed at the other longitudinal end of the insertion portion 82.
[0039]
Each attachment member 3a, 3b has a laterally long insertion hole 85a, 85b having an internal cross section slightly larger than the cross section perpendicular to the longitudinal direction of the insertion portion 82 of the insertion fixture 82 instead of the guide elongated holes 29a, 29b. It is formed. The bent portion 83 is welded to the surface 86 in a state where the insertion hole 85a of one mounting member 3a is inserted into contact with the surface 86 of the mounting member 3a. In the same manner as in the above-described embodiment, one bolt insertion hole 27a, outer sheet 22, refractory material 21, the other bolt insertion hole 27b, and the other mounting member of the holder 2 are fixed to the mounting member 3a. The puncture portion 84 is protruded from the other attachment member 3b through the insertion hole 85b of 3b, and the puncture portion 84 is bent upward substantially at a right angle as indicated by a virtual line 87. Thus, each attachment member 3a, 3b can be connected to the fireproof zone to which the holder 2 is fixed.
[0040]
In this case, since the bent portion 83 of the insertion fixing metal fitting 81 protrudes from the one mounting member 3a, the bent portion is formed on the substrate 43 of the edge member 41 provided in contact with the one mounting member 3a. By forming a hole or notch into which 83 can be fitted, the substrate 43 can be brought into contact with almost one entire surface of the mounting member 3a and can be stably fixed to the upper wall portion 12 by the anchor bolt 36a. . Note that portions corresponding to those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted to avoid duplication.
[0041]
As still another embodiment of the present invention, in each of the embodiments shown in FIGS. 1 to 4, the upper wall portion 12 and the lower wall portion of the partition wall 4 in the building adjacent to each other with the gap 14 interposed therebetween. Although the expansion / contraction fireproof structure implemented between the wall 13 and the wall 13 is described, the present invention is preferably practiced in order to block other walls such as the outer wall and the inner wall of the building instead of the partition wall 4. can do.
[0042]
In each of the above-described embodiments, the configuration in which the refractory belt 1 is provided on the upper wall portion 12 of the upper-layer housing 6 by the mounting members 3a and 3b together with the holder 2 is described, but as still another embodiment of the present invention, You may make it provide in the lower wall part 13. FIG.
[0043]
【The invention's effect】
As described above, according to the present invention, in the base-isolated building, the edge member is fixed to the wall of the upper frame, and the cover plate is rotatably held on the edge member by the hinge portion, and the cover plate has a lower end portion thereof. Is spring-biased in the direction approaching the wall of the lower housing. In addition, a long and stretchable fireproof belt is provided between the upper and lower housings, and the upper and lower housings are allowed to allow relative displacement between the upper and lower housings. The gap between each wall is closed. In such a refractory belt, a metal holder having a concave cross-sectional shape, for example, a steel holder is fixed in a state where the sliding portion protrudes, and an attachment member made of metal is connected to the holder. The
[0044]
In such a configuration, when mounting the refractory zone in the space between the walls of the upper and lower casings, the mounting member with the sliding portion of the refractory zone in contact with the wall of the lower or upper casing Is fixed to the wall of the upper-layer casing or the wall of the lower-layer casing opposite to the one wall with which the sliding portion contacts.
[0045]
In this way, the edge layer is fixed to the upper layer along the gap, and the cover plate that is rotatably held by the hinge portion of the edge member is provided to cover the fire zone, so that the fire zone is protected. Thus, it is possible to prevent damage and more reliably prevent the flame from entering. In addition, by providing a fire-resistant zone in the gap, in the state fixed to the wall of the upper frame or the wall of the lower frame as described above, the wall of the frame opposite to the wall of the fixed frame is fixed. Even if the upper and lower housings are relatively displaced due to an earthquake or ground subsidence, the shape of the refractory zone is greatly deformed, so that no gaps are formed between the opposing housing walls and the air gaps are reliably closed. In this state, the relative displacement between the respective bodies can be allowed.
[0046]
In addition, as described above, the refractory zone is fixed to either the wall of the upper frame or the wall of the lower frame, so that it is possible to avoid interference with either of them, and thereby a large displacement between the upper frame and the lower frame. Can be tolerated. In addition, since the retainer and the mounting member are made of metal, for example, steel, it is possible to reliably prevent a problem of being deformed by high heat at the time of a fire or being melted down and flowing down, thereby realizing a highly reliable fireproof structure. be able to.
[Brief description of the drawings]
FIG. 1 is a vertical sectional view showing an expansion / contraction fireproof structure of a base-isolated building according to an embodiment of the present invention.
2 is an exploded perspective view showing the refractory belt 1, the holder 2, and the mounting members 3a and 3b shown in FIG.
FIG. 3 is a horizontal sectional view of a partition wall 4 in which the expansion / contraction fireproof structure shown in FIGS. 1 and 2 is implemented, and the vicinity of the seismic isolation device 5 surrounded by the partition wall.
FIG. 4 is a partially cutaway perspective view showing a state in which the edge member 41, the cover plate 56, and the drainage cover body 73 are attached.
FIG. 5 is an exploded perspective view showing a stretchable fireproof structure for a base-isolated building according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fireproof zone 2 Holding fixture 3a, 3b Mounting member 4 Bulkhead 5 Seismic isolation device 6 Upper layer frame 7 Lower layer frame 8, 9 Column 12 Upper wall part 13 Lower wall part 14 Space | gap 15 Lower surface 16 Upper surface 21 Refractory material 22 Outer sheet 26 Bolt 41 Edge material 53 Hinge portion 56 Cover plate 63 Lower end portion 68 Anti-rest spring 73 Drain cover 81 Insert fixing bracket

Claims (1)

In a seismic isolation building where a seismic isolation device is interposed between the upper and lower frames of a horizontally divided building,
An edge member having a hinge portion is fixed to the wall of the upper frame, and the edge member is rotatably held by the hinge portion, and a spring is attached in a direction in which the lower end portion is close to the wall of the lower layer precursor. Providing a biased cover plate to cover the gap between the walls of the upper and lower housings;
In the gap, a long refractory belt is provided that allows relative displacement between the upper and lower casings and is stretchable in the thickness direction to close the gap.
A holder made of metal having a concave cross section with a space in the longitudinal direction is fixed to the fireproof zone so as to project the sliding portion of the fireproof zone facing the wall of the lower casing or the wall of the upper casing. ,
An attachment member made of metal is connected to the holder, and the attachment member is configured such that the refractory belt has the sliding portion in contact with the wall of the lower housing or the wall of the upper housing, or the wall or lower layer of the upper housing. Wall-proof structure for base-isolated buildings, characterized by being fixed to the walls of the frame.

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