Fire-resistant equipment for the target site

Abstract

The present invention provides a fire-resistant device for joints that can block flames and radiant heat from fires, and can also adapt to forward, backward, and lateral movements caused by earthquakes. [Solution] A fire-resistant joint device 1 is provided in the joint 2 between one structural frame 3 and the other structural frame 4, and consists of a fire-resistant band support rail 6 provided on a central maintenance mechanism 5 provided between the structural frames, ceiling fire-resistant bands 8 and 9 on one structural frame side and the other structural frame side that are slidably attached to the fire-resistant band support rail in the front-rear direction, a wall fire-resistant band support member 21 provided in the approximate center of the joint in the left-right direction, wall fire-resistant bands 22 and 23 on one structural frame side and the other structural frame side that are attached to the wall fire-resistant band support member, and ceiling fire-resistant band receiving parts 24 provided on the upper part of the wall fire-resistant bands, and the ceiling fire-resistant bands absorb the shaking caused by the earthquake by changing from a hanging position to a position where the hanging is reduced when the joint widens due to the earthquake.

Description

Technical Field

[0001] The present invention relates to a fire-resistant device for a joint provided between left and right bodies.

Background Art

[0002] Conventionally, as a fire-resistant device or fire-resistant structure mainly provided at a joint, "a fire-resistant material support mechanism that is pivotally supported on one wall surface of the ceiling or floor portion on the opening side of the left and right bodies arranged via the joint, and is attached to a guide rail on the other wall surface so as to be slidable in the front-rear direction, and a substantially central portion that protrudes in a mountain shape or a valley shape is pivotally supported, and a fire-resistant material that is fixed to this fire-resistant material support mechanism and covers the joint of the ceiling or floor portion with both ends in contact with one wall surface and the other wall surface and is attached so as to be able to follow the movement of the fire-resistant cloth support mechanism" is known (Patent Document 1). However, such a fire-resistant wall is very effective when the left and right bodies swing only in the left-right direction due to an earthquake. However, when the left and right bodies swing in different front-rear directions, the fire-resistant material cannot follow the earthquake sway, and there is a risk that the fire-resistant material will be damaged.

[0003] Also, although a wall-shaped side fire-resistant wall is provided on the side surface, it is provided only between the ceiling material and the floor material, and it is not possible to prevent flames and radiant heat from between the ceiling fire-resistant material and the side fire-resistant wall.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of the above-mentioned drawbacks of conventional devices, the present invention aims to provide a fire-resistant device for joints that can block flames and radiant heat from fires, and can also follow forward, backward, and sideways movements caused by earthquakes.

[0006] The aforementioned and other objectives and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.

[0007] However, the drawings are for illustrative purposes only and do not limit the technical scope of the present invention. [Means for solving the problem]

[0008] To achieve the above objective, the fire-resistant joint device described in claim 1 of the present invention is a fire-resistant joint device provided in the joint between one structural body and the other structural body, comprising: a fire-resistant strip support rail provided on a central maintenance mechanism provided between the structural bodies; ceiling fire-resistant strips on one structural body side and the other structural body side that are slidably attached to the fire-resistant strip support rail in the front-rear direction; a wall fire-resistant strip support member provided in the approximate center of the joint in the left-right direction; wall fire-resistant strips on one structural body side and the other structural body side attached to the wall fire-resistant strip support member; and ceiling fire-resistant strip receiving parts provided on the upper part of the wall fire-resistant strips. Furthermore, when the fire-resistant ceiling strips sway due to an earthquake, causing the joints to widen, they change from a sagging position to a less sagging position to absorb the swaying caused by the earthquake. On the other hand, when the one structural frame and the other structural frame sway in different front-to-back directions due to the earthquake, the other ends of the fire-resistant ceiling strips on the one structural frame side and the other structural frame side slide along the fire-resistant strip support rail to follow the swaying caused by the earthquake. The fire-resistant ceiling strip receiving portion is characterized in that, under normal conditions, it abuts the lower ends of the fire-resistant ceiling strips on the one structural frame side and the other structural frame side in a state of approximate line contact or approximate surface contact.

[0009] The fire-resistant strip for the ceiling on one structural frame side of the joint fire-resistant device according to claim 2 is characterized in that one end of the strip is attached to the one structural frame via a first hinge member, and the other end is attached to the fire-resistant strip support rail via a mounting fixture so as to be slidable in the front-rear direction, and the fire-resistant strip for the ceiling on the other structural frame side is characterized in that one end of the strip is attached to the other structural frame via a second hinge member, and the other end is attached to the fire-resistant strip support rail via a mounting fixture so as to be slidable in the front-rear direction.

[0010] The fire-resistant strip support rail of the joint fire-resistant device according to claim 3 is characterized in that it is composed of a beam member pivotally supported by the movable central maintenance mechanism and a guide rail fixed to the bottom of the beam member and having a slit, and the mounting fixture is characterized in that it is composed of a slide body inserted into the guide rail and slidable in the front-rear direction and a fire-resistant strip mounting portion provided on the slide body and capable of passing through the slit.

[0011] The ceiling fire-resistant strip receiving portion of the joint fire-resistant device described in claim 4 is formed to extend in the front-rear direction, and is characterized in that even when one structural body and the other structural body sway in different front-rear directions due to an earthquake, it abuts the lower end of the ceiling fire-resistant strip on the one structural body side and the lower end of the ceiling fire-resistant strip on the other structural body side in a state of substantially linear contact or substantially surface contact. [Effects of the Invention]

[0012] As is clear from the above explanation, the present invention provides the following effects. (1) In the invention described in claim 1, the other ends of the fire-resistant ceiling strips on one and the other sides of the building structure are attached to the fire-resistant strip support rail so as to be slidable in the front-rear direction. Therefore, even if the left and right sides of the building structure sway in different front-rear directions due to an earthquake, the fire-resistant ceiling strips on one and the other sides of the building structure will follow the swaying caused by the earthquake, and the swaying caused by the earthquake will be absorbed without damage to the building structure or the fire-resistant strips. (2) Since a receiving portion for the ceiling fire-resistant strip is formed, it is possible to prevent a large gap from occurring between the ceiling fire-resistant strip and the wall fire-resistant strip. Therefore, it is possible to reliably prevent flames and radiant heat from entering the inside between the ceiling fire-resistant band and the wall fire-resistant band during a fire. (3) In each of the inventions described in claim 2 and claim 3, the same effects as those in the above (1) to (2) can be obtained, and it is possible to more smoothly follow the shaking movement caused by an earthquake. (4) In the invention described in claim 4, the same effects as those in the above (1) to (3) can be obtained, and it is possible to prevent a large gap from occurring between the ceiling fire-resistant band and the wall fire-resistant band even when the left and right building bodies sway in different front-rear directions.

Brief Description of the Drawings

[0013] FIGS. 1 to 11 are explanatory diagrams showing the first embodiment of the present invention. [Figure 1] Plan view of the fire-resistant device according to the first embodiment. [Figure 2] Front view of the fire-resistant device according to the first embodiment. [Figure 3] Cross-sectional view taken along line 3-3 of FIG. 1. [Figure 4] Explanatory diagram of the ceiling fire-resistant band and the fire-resistant band support rail. [Figure 5] Plan view of the wall fire-resistant band. [Figure 6] Front view of the wall fire-resistant band. [Figure 7] Perspective view of the wall fire-resistant band. [Figure 8] Explanatory diagram of the ceiling fire-resistant band and the wall fire-resistant band. [Figure 9] Operation explanatory diagram of the state where the joint part becomes narrow due to an earthquake. [Figure 10] Operation explanatory diagram of the state where the joint part becomes wide due to an earthquake. [Figure 11] Operation explanatory diagram of the state where the left and right building bodies sway in different front-rear directions due to an earthquake.

Embodiments for Carrying Out the Invention

[0014] Hereinafter, the present invention will be described in detail according to the embodiments for carrying out the present invention shown in the drawings. In this specification, the left-right direction and the front (lower side of the drawing) - rear (upper side of the drawing) direction are defined based on FIG. 1. The up-down direction is defined based on FIG. 2 (upper side of the drawing - lower side of the drawing).

[0015] In addition, in the present invention, the building structure refers to a building such as a building, a road, a slab, an elevator shaft, etc. where a joint plate can be installed, and the entrance / exit includes not only the entrance / exit with a door or a gate, but also a passage through which people, vehicles, etc. can pass.

[0016] In the first embodiment for carrying out the present invention shown in FIGS. 1 to 11, reference numeral 1 denotes a fireproof device for a joint provided at the joint portion 2 between one building structure 3 and the other building structure 4.

[0017] This fireproof device 1 for the joint portion, as shown in FIGS. 1 to 3 for example, is a fireproof device 1 for the joint portion provided at the joint portion 2 between one building structure 3 and the other building structure 4, and includes a fireproof strip support rail 6 provided on a movable central maintenance mechanism 5 (a member that is diagonal with respect to the left and right building structures in FIG. 1 and a member that is horizontal with respect to the left and right building structures in FIG. 2) provided in a spanning state between the building structures; a ceiling fireproof strip 8 on one building structure side, one end of which is attached to the one building structure 3 via a hinge member 7 and the other end of which is slidably attached to the fireproof strip support rail 6 in the front-rear direction; a ceiling fireproof strip 9 on the other building structure side, one end of which is attached to the other building structure 3 via a hinge member and the other end of which is slidably attached to the fireproof strip support rail 6 in the front-rear direction; a wall fireproof strip support member 21, the upper end of which is slidably connected to the fireproof strip support rail 6 in the front-rear direction and is provided at a substantially central portion in the left-right direction of the joint portion 2; a wall fireproof strip 22 on one building structure side, one end of which is attached to the one building structure 3 via a hinge member 7 and the other end of which is attached to the wall fireproof strip support member 21; a wall fireproof strip 23 on the other building structure side, one end of which is attached to the other building structure via a hinge member 7 and the other end of which is attached to the wall fireproof strip support member 21; and ceiling fireproof strip receiving portions 24 provided respectively at the upper portions of the wall fireproof strips 22 and 23 on the one and the other building structure sides.

[0018] In Figure 2, the part indicated by reference numeral 7 to which the fire-resistant ceiling strip 8 is attached on one side of the building structure 3 is the first hinge member, while the part indicated by reference numeral 7 to which the fire-resistant ceiling strip 9 is attached on the other side of the building structure 4 is the second hinge member.

[0019] The central maintenance mechanism 5, as shown in Figure 1, for example, in this embodiment, consists of a pair of slide rails 10 provided on one structural frame 3 and the other structural frame 4, and a plurality of bar members 12 whose ends are slidably mounted on the slide rails 10 via rolling members 11 in the front-rear direction. A long fire-resistant belt support rail 6 is suspended from the approximate center of the plurality of bar members 12 by a pivot pin 5a. Since the central part of the bar member 12 is always located approximately in the left-right center of the joint 2, the fire-resistant belt support rail 6 provided approximately in the center of the bar member 12 is always located approximately in the center of the joint 2. Also in Figure 1, the plurality of bar members 12 rotate parallel to each other, with the pivot pin 5a as the fulcrum, and one bar member 12 and the other bar member 12 spaced apart from it.

[0020] The slide rail 10 is a rail material that is substantially U-shaped upward, substantially crank-shaped, substantially lip-shaped channel-shaped, or substantially channel-shaped, and is provided to extend in the front-rear direction. In this embodiment, the sliding material 11 is a roller pivotally provided at both ends of the bar member 12 and is formed in a shape that allows it to move smoothly within the slide rail 10. However, the sliding material 11 is not limited to a roller-shaped member and can be any material that allows for smooth movement within the slide rail 10.

[0021] Furthermore, the slide rail 10 should be equipped with a means to prevent the sliding material 11 from falling off even if the left and right structural members settle unevenly. For example, a return can be provided on the edge on the joint 2 side, and a locking piece that engages with the return can be provided on the sliding material 11, or pins can be passed through the vicinity of both ends of the bar member 12 so that when uneven settlement occurs, these pins will come into contact with the guide rail 10 and prevent it from falling off. In such cases, the sliding material 11 can be attached to the bar member 12 directly or indirectly via a hinge member or the like.

[0022] The bar member 12 is provided so as to be at an angle in a plan view, and it is desirable that even when the joint 2 widens to its maximum width due to an earthquake, it remains at an angle in a plan view, preferably with dimensions such that the angle it forms with the left and right structural members 3 and 4 is about 60 degrees.

[0023] As shown in Figure 4, the fire-resistant belt support rail 6 is composed of a bar-shaped beam member 13 that is pivotally attached to the plurality of bar members 12, and a guide rail 15 fixed to the bottom of the beam member 13 and having a pair of slits 14. It is located approximately in the center of the joint 2 and extends in the front-rear direction. In this embodiment, the guide rail 15 is formed in a shape like two light channel steel sections connected together, and the inside of the guide rail 15 is a space that allows the fire-resistant belt fixing device, which will be described later, to be installed in the front-rear direction. Alternatively, a pair of guide rails 15 in the shape of light channel steel or hat-shaped steel may be fixed to the bottom of the beam member 13. The pair of guide rails 15 may be separate types with individual slits or integrated types with a pair of slits, but considering the reduction of the number of parts and ease of construction, an integrated type with a pair of slits is preferable.

[0024] In this embodiment, the fire-resistant strip support member 21 for the wall surface is slidably connected to approximately the center portion of the guide rail 15 in a suspended state.

[0025] As shown in Figure 4, the fire-resistant ceiling strips 8 and 9 on one and the other sides of the building structure are composed of a fire-resistant material 16 made of a cotton-like material that has fire resistance and flexibility, such as rock wool, and a bag-shaped covering member 17 filled with this fire-resistant material 16. Note that, for example, if a sheet-shaped fire-resistant material 16 is used, the ceiling fire-resistant strips 8 and 9 may be composed solely of this fire-resistant material 16, or the sheet-shaped fire-resistant material 16 may be covered with the covering member 17.

[0026] In this embodiment, the covering member 17 is a flexible sheet, and it is desirable that this covering member 17 is also made of a fire-resistant material.

[0027] The fire-resistant ceiling strips 8 and 9 on one and the other sides of the building structure are attached at one end to the building structure 3 and 4 via the first and second hinge members 7, respectively, and at the other end they are slidably attached in the front-rear direction to the fire-resistant strip support rail 6 via the mounting fixture 18.

[0028] The ceiling fire-resistant strips 8 and 9 are designed so that they will not rupture even when the joint 2 expands to its maximum extent due to an earthquake. Their length in the left-right direction is greater than the width of the joint 2 when it is fully expanded. Therefore, in the normal state (as shown in Figures 1 to 3), their central portion hangs downward due to its own weight, and the ceiling fire-resistant strips 8 and 9 as a whole are arranged to form a roughly W shape when viewed from the front.

[0029] The mounting fixture 18 consists of a sliding body 19 inserted into the guide rail 15 and a fire-resistant band mounting portion 20 provided on the sliding body 19. In this embodiment, the sliding body 19 is formed in a cylindrical shape in cross-section, and the plate-shaped portion protruding outward from this cylindrical portion is the fire-resistant band mounting portion 20.

[0030] The fire-resistant strip attachment section 20 is shaped to allow passage through the slit 14 of the guide rail 15, and the ceiling fire-resistant strips 8 and 9 are fixed to the fire-resistant strip attachment section 20 with screws or the like. Alternatively, a clamping device or the like may be fixed to the tip of the fire-resistant strip attachment section 20, and the other ends of the ceiling fire-resistant strips 8 and 9 may be attached using this clamping device.

[0031] As shown in Figures 5 to 7, one end of each of the fire-resistant strips 22 and 23 for the walls on one and the other structural frame sides is attached to one or the other structural frame 3 and 4 via the third and fourth hinge members 7, respectively, and the other end is attached to the fire-resistant strip support member 21 for the wall surface by screws or the like. Preferably, the other end is also attached to the fire-resistant strip support member 21 for the wall surface by the hinge member or the like. These fire-resistant strips 22 and 23 for the walls on the one and the other structural frame sides are installed with a slight sag so that their approximate central portion is bent inward (upward and backward in Figure 1) in order to absorb the shaking when the joint 2 widens due to shaking caused by an earthquake.

[0032] In Figure 2, the reference numeral 7 that attaches the fire-resistant strip 22 to the wall surface on one side of the structure 3 is the third hinge member, while the reference numeral 7 that attaches the fire-resistant strip 23 to the wall surface on the other side of the structure 4 is the fourth hinge member.

[0033] The wall-mounted fire-resistant strip support member 21 is a rectangular column, cylindrical column, square pipe, or pipe-shaped bar member. In this embodiment, the upper end of a rectangular column-shaped bar member is rotatably connected to the fire-resistant strip support rail 6 in a suspended state at approximately the center, and is positioned approximately in the center of the joint 2 in the left-right direction. One or more link mechanisms may be provided in the longitudinal direction of the wall-mounted fire-resistant strip support member 21 and connected to the central pivot 25a of the link mechanism 25 so as to rotate together with the link mechanism 25. In this embodiment, the wall-mounted fire-resistant strip support member 21 is rotatably suspended from the fire-resistant strip support rail 6 by support member mounting fixtures 26 such as screws, pins, or bolts, and is also provided between the left and right structural members, connected to the central pivot 25a of this link mechanism 25. Preferably, as in this embodiment, the wall-mounted fire-resistant strip support member 21 is provided using either the link mechanism 25 or the support member mounting bracket 26, but it may also be provided using either the link mechanism 25 or the support member mounting bracket 26.

[0034] The fire-resistant strips 22 and 23 on the wall sides of one and the other structural frame are composed of bag-shaped covering members 17 filled with fire-resistant material 16, similar to the fire-resistant strips 8 and 9 on the ceiling sides of one and the other structural frame. At the upper ends of the fire-resistant strips 22 and 23 on the wall sides of one and the other structural frame, there are ceiling fire-resistant strip receiving portions 24 that, in a normal state (the state shown in Figures 1 to 3), are in substantially line contact or substantially surface contact with substantially the entire lower ends of the ceiling fire-resistant strip 8 on one structural frame and the ceiling fire-resistant strip 9 on the other structural frame. Here, substantially line contact or substantially surface contact includes not only cases where the entire lower ends of the ceiling fire-resistant strips 8 and 9 are in line contact or surface contact, but also cases where there is a small gap in part. Furthermore, "normal state" refers to a state in which no shaking due to an earthquake is occurring.

[0035] In this embodiment, as shown in Figures 5 to 8, the upper ends of the wall fire-resistant strips 22 and 23 on one and the other structural frame sides are convex downwards, and the upper parts of the wall fire-resistant strips 22 and 23 on one and the other structural frame sides are bent backwards to form the ceiling fire-resistant strip support portion 24 so that it extends in the front-rear direction (thickness direction of the wall fire-resistant strips 22 and 23) on the rearward side. By using such a ceiling fire-resistant strip support portion 24, even if the one structural frame 3 and the other structural frame 4 sway in different front-rear directions due to an earthquake, the lower ends of the ceiling fire-resistant strip 8 on one structural frame side and the ceiling fire-resistant strip 9 on the other structural frame side will be in substantially line contact or substantially surface contact.

[0036] In this embodiment, the upper parts of the wall-mounted fire-resistant strips 22 and 23 are bent backward to form the ceiling-mounted fire-resistant strip receiving portion 24. However, a separate receiving member may also be fixed to the rear side of the upper end of the wall-mounted fire-resistant strips 22 and 23 to form the ceiling-mounted fire-resistant strip receiving portion 24.

[0037] Alternatively, the ceiling fire-resistant strip receiving portion 24 may be formed by simply creating a downward convex shape at the upper ends of the wall fire-resistant strips 22 and 23 on one and the other structural side so that they abut the lower ends of the ceiling fire-resistant strip 8 on one structural side and the ceiling fire-resistant strip 9 on the other structural side.

[0038] When the structural members 3 and 4 sway from side to side during an earthquake, causing the joint 2 to narrow, the ceiling fire-resistant strips 8 and 9 contract, as shown in Figure 9. Their central sections sag significantly lower than normal, absorbing the swaying caused by the earthquake. Similarly, the wall fire-resistant strips 22 and 23 also contract from side to side, absorbing the swaying caused by the earthquake.

[0039] When the structural members 3 and 4 sway from side to side during an earthquake, causing the joints 2 to widen, the ceiling fire-resistant strips 8 and 9 change from a sagging position to a less sagging position, as shown in Figure 10, and the wall fire-resistant strips 22 and 23 extend from side to side, thereby absorbing the shaking caused by the earthquake.

[0040] Furthermore, as the ceiling fire-resistant strips 8 and 9 extend in the left-right direction, the sagging in the central part decreases (resulting in a less drooping posture). Therefore, during an earthquake, the ceiling fire-resistant strip support portion 24 and the bottoms of the ceiling fire-resistant strips 8 and 9 will not be in approximate line or surface contact. However, this is only for a short time, and once the shaking caused by the earthquake stops, the ceiling fire-resistant strip support portion 24 and the bottoms of the ceiling fire-resistant strips 8 and 9 will return to approximate line or surface contact, so there is no problem with fire resistance performance.

[0041] If the structural frames 3 and 4 sway in different longitudinal directions during an earthquake, as shown in Figure 11, the other end of the ceiling fire-resistant strip 8 on one structural frame side slides in the longitudinal direction, following the swaying motion caused by the earthquake in synchronization with structural frame 3, while the other end of the ceiling fire-resistant strip 9 on the other structural frame side slides in the longitudinal direction, following the swaying motion caused by the earthquake in synchronization with structural frame 4. Similarly, one end of the wall fire-resistant strips 22 and 23 rotates in the longitudinal direction with the hinge member 7 as a pivot point, and the wall fire-resistant strip support member 21 slides in the longitudinal direction as needed, absorbing the swaying motion caused by the earthquake without damaging the structural frames or these devices.

[0042] Furthermore, the ceiling fire-resistant strip receiving portion 24 is formed to extend in the front-rear direction, so that even if one structural frame and the other structural frame sway in different front-rear directions due to an earthquake, it will come into contact with the lower ends of the ceiling fire-resistant strip 8 on the side of one structural frame and the ceiling fire-resistant strip 9 on the side of the other structural frame in a state of approximate line contact or approximate surface contact.

[0043] In the embodiment of the present invention, a central retention mechanism using a pair of slide rails and multiple bar members was used, but a known central retention mechanism using link members, rack and pinion, etc., can also be used. [Industrial applicability]

[0044] This invention is used in industries that manufacture and use fire-resistant devices for joints. [Explanation of Symbols]

[0045] 1: Fireproof device, 2: Joint area, 3: One structural frame, 4: The other structural frame, 5: Central maintenance mechanism, 6: Fire-resistant belt support rail, 7: Hinge member, 8: Fire-resistant strip for the ceiling on one side of the building structure, 9: Fire-resistant strip for the ceiling on the other side of the building structure, 10: Slide rail, 11: Rolling member, 12: Bar member, 13: Beam material, 14: Slit, 15: Guide rail, 16: Fireproof material, 17: Covering material, 18: Mounting hardware, 19: Sliding body, 20: Fire-resistant band attachment part, 21: Fire-resistant strip support member for wall surface, 22: Fire-resistant strip for wall surface on one side of the building structure, 23: Fire-resistant strip for the wall on the other side of the structure, 24: Fire-resistant strip receiving part for the ceiling, 25: Link mechanism, 26: Support member mounting bracket.

Claims

1. A fire-resistant device for joints, which is installed in the joint between one structural frame and the other structural frame, It consists of a fire-resistant strip support rail provided on a central maintenance mechanism provided between the aforementioned structural bodies, ceiling fire-resistant strips on one structural body side and the other structural body side that are slidably attached to the fire-resistant strip support rail in the front-rear direction, a wall fire-resistant strip support member provided approximately in the left-right center of the joint, wall fire-resistant strips on one structural body side and the other structural body side attached to the wall fire-resistant strip support member, and ceiling fire-resistant strip receiving parts provided on the upper part of the wall fire-resistant strips. When the fire-resistant ceiling strips sway due to an earthquake, causing the joints to widen, they change from a sagging position to a less sagging position to absorb the swaying caused by the earthquake. On the other hand, when the one and the other structural members sway in different longitudinal directions due to the earthquake, the other ends of the fire-resistant ceiling strips on the one structural member side and the other structural member side slide along the fire-resistant strip support rails to follow the swaying caused by the earthquake. The aforementioned ceiling fire-resistant strip receiving portion is a joint fire-resistant device that, under normal conditions, abuts the lower ends of the ceiling fire-resistant strips on one structural frame side and the other structural frame side, respectively, in a state of approximate line contact or approximate surface contact.

2. The fire-resistant ceiling strip on one structural frame side is characterized in that one end of the strip is attached to the structural frame on the one structural frame side via a first hinge member, and the other end is attached to the fire-resistant strip support rail via a mounting fixture so as to be slidable in the front-rear direction, and the fire-resistant ceiling strip on the other structural frame side is characterized in that one end of the strip is attached to the other structural frame via a second hinge member, and the other end is attached to the fire-resistant strip support rail via a mounting fixture so as to be slidable in the front-rear direction, as described in claim 1.

3. The fire-resistant strip support rail is composed of a beam member pivotally supported by the movable central maintenance mechanism and a guide rail fixed to the bottom of the beam member and having a slit, and the mounting fixture is composed of a sliding body inserted into the guide rail and slidable in the front-rear direction and a fire-resistant strip mounting portion provided on the sliding body and capable of passing through the slit, as described in claim 2.

4. The fire-resistant strip receiving portion for the ceiling is formed to extend in the front-rear direction, and even if the one structural frame and the other structural frame sway in different front-rear directions due to an earthquake, the fire-resistant strip for the ceiling on the one structural frame side and the lower end of the fire-resistant strip for the ceiling on the other structural frame side are in substantially line contact or substantially surface contact, as described in any one of claims 1 to 3.

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