Ceiling inspection hatch

Abstract

To suppress circulation of fire or heat through a gap between an inner frame and an outer frame during a fire disaster.SOLUTION: A ceiling inspection port 1 comprises: an outer frame 10 attached to an opening 101 of a ceiling material 100; and an inner frame 20 openably / closably assembled to an opening 14 of the outer frame 10. A heating expansion material 51 is provided between the outer frame 10 and the inner frame 20.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a ceiling inspection hatch that is attached to an opening formed in a ceiling, and in particular to a ceiling inspection hatch that has excellent fire resistance. [Background technology]

[0002] A known conventional ceiling inspection hatch includes an outer frame that is attached to an opening formed in the ceiling and an inner frame that is assembled within the outer frame so that it can be opened and closed, with the outer and inner frames being made of aluminum (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-138040 Summary of the Invention [Problem to be solved by the invention]

[0004] In the ceiling inspection hatch described in Patent Document 1, the inner frame is attached to the outer frame so that it can be opened and closed, leaving a relatively large gap between the inner and outer frames. Therefore, in the event of a fire, the ceiling inspection hatch itself heats up, and fire and heat easily spread through the gap between the inner and outer frames of the ceiling inspection hatch. When fire and heat spread through the gap, the fire resistance is significantly reduced. In particular, if the outer and inner frames of the ceiling inspection hatch are made of aluminum, these frames are easily heated, which can cause them to melt and fall off, leading to the ceiling inspection hatch itself falling off.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a ceiling inspection hatch that is highly fire-resistant. [Means for solving the problem]

[0006] The ceiling inspection hatch of the present invention is In the first perspective,A ceiling inspection hatch comprising an outer frame attached to an opening in a ceiling material and an inner frame assembled to the opening of the outer frame so as to be able to open and close, , facing the outer frame The inner frame side wall A first thermal expansion material is provided between them.

[0007] According to this, the first thermal expansion material expands due to the heat during a fire and fills the gap between the outer and inner frames, making it harder for fire and heat to spread through the gap, improving fire resistance.

[0008] In the present invention, the inner frame is ,before An outer flange extending outward from the lower end of the side wall Department The first thermal expansion material is preferably disposed between the side wall and the tip of the outer flange in the direction of extension of the outer flange. This prevents the first thermal expansion material from protruding beyond the tip of the outer flange when not heated by a fire or the like. This prevents the first thermal expansion material from interfering with the opening and closing operation of the inner frame and enhances the design.

[0009] Furthermore, in the present invention, a second thermal expansion material is preferably provided on the outer surface of the outer frame, in a portion facing the ceiling material. As a result, even if a gap occurs between the outer frame and the ceiling material, the second thermal expansion material expands due to the heat during a fire and fills the gap. This makes it difficult for fire or heat to spread through the gap, further improving fire resistance. As a result, the fire resistance required for buildings, such as 45-minute quasi-fire resistance or higher, can be ensured.

[0010] In addition, in the present invention, it is preferable that the outer frame has a side wall facing the ceiling material and an outer flange portion that protrudes outward from the lower end of the side wall of the outer frame, and the second thermal expansion material is disposed between the side wall of the outer frame and the tip of the outer flange portion of the outer frame in the protruding direction of the outer flange portion of the outer frame. This allows the second thermal expansion material to be disposed without protruding outward beyond the tip of the outer flange portion. This prevents the second thermal expansion material from interfering with the installation of a ceiling inspection hatch in an opening in the ceiling and also improves the design.

[0011] Furthermore, the present invention In a second aspect, the ceiling inspection hatch is a ceiling inspection hatch comprising an outer frame attached to an opening in a ceiling material, and an inner frame assembled to the opening of the outer frame so as to be able to open and close, wherein the outer frame has a side wall and an outer flange portion that protrudes outward from a lower end of the side wall, the inner frame has a side wall that faces the side wall of the outer frame, an outer flange portion that protrudes outward from a lower end of the side wall of the inner frame, and a mounting flange fixed to the lower surface of the outer flange portion of the inner frame, a thermal expansion material is provided between the side wall of the outer frame and the side wall of the inner frame, and an airtight packing is provided between the mounting flange and the outer flange portion of the outer frame. . In addition, from a third perspective, the ceiling inspection hatch of the present invention is a ceiling inspection hatch comprising an outer frame attached to an opening in a ceiling material and an inner frame assembled to the opening of the outer frame so as to be able to open and close, wherein the outer frame has a side wall and an outer flange portion that protrudes outward from the lower end of the side wall, the inner frame has a side wall that faces the side wall of the outer frame, a thermal expansion material is provided between the side wall of the outer frame and the side wall of the inner frame, and an airtight gasket is provided on the outer flange portion of the outer frame to fill the gap between it and the ceiling material. [Effects of the Invention]

[0012] With the ceiling inspection hatch of the present invention, the first thermal expansion material expands due to heat during a fire, filling the gap between the outer and inner frames. This makes it difficult for fire and heat to spread through the gap, improving fire resistance. Furthermore, when installing conventional aluminum ceiling inspection hatches, a fireproof coating had to be applied as an additional fireproofing measure at the construction site during installation to ensure the fireproof performance of the ceiling surface. However, with the ceiling inspection hatch of the present invention, this measure is no longer necessary. Furthermore, the fireproof coating applied as a fireproofing measure must be removed during inspection, which can lead to the risk of not repairing the fireproof coating after inspection, which can also be avoided. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic top view of a ceiling inspection hatch according to one embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II shown in FIG. [Figure 3] FIG. 2 is a schematic perspective view of the outer frame shown in FIG. [Figure 4] FIG. 2 is a schematic perspective view of the inner frame shown in FIG. [Figure 5] FIG. 3 is a cross-sectional view showing a state when the thermal expansion material shown in FIG. 2 is heated. DETAILED DESCRIPTION OF THE INVENTION

[0014] A ceiling inspection hatch 1 according to one embodiment of the present invention will now be described with reference to FIGS.

[0015] As shown in FIGS. 1 and 2, the ceiling inspection hatch 1 includes an outer frame 10, an inner frame 20, a cover 30, a lid material 40, and two thermal expansion materials 51 and 52. As shown in FIG. 2, the outer frame 10 is attached to an opening 101 in a ceiling material 100. The ceiling material 100 is composed of a ceiling board 100a in which an opening 100a1 is formed, and a base material 100b made of a square timber fixed onto the ceiling board 100a. The base material 100b is arranged around the entire perimeter of the opening 100a1. The opening 101 in the ceiling material 100 is defined by the opening 100a1 in the ceiling board 100a and the base material 100b.

[0016] The outer frame 10 is made of an iron alloy. More specifically, in this embodiment, the outer frame 10 is made of a hot-dip galvanized steel plate. However, the outer frame 10 may be made of other iron alloys (such as a stainless steel plate) or iron. As shown in FIG. 3, the outer frame 10 is formed into a rectangular shape by four linearly extending outer frame members 11 connected to each other by angled metal fittings 12.

[0017] As shown in FIG. 2, the outer frame material 11 is formed by bending a thin steel plate, and has side walls 11a that face the ceiling material 100 and outer flange portions 11b that protrude outward from the lower ends of the side walls 11a. As shown in FIG. 3, four outer frame materials 11 are connected by corner metal fittings 12, so that the four side walls 11a form a rectangular annular side wall 13. An opening 14 is formed within the annular side wall 13. The outer flange portions 11b are formed over the entire length of the side walls 11a in the extension direction. Therefore, when the four outer frame materials 11 are connected by the corner metal fittings 12, the four outer flange portions 11b also form a rectangular annular flange.

[0018] As shown in FIG. 2, the upper portion of the side wall 11a is formed with a folded portion 11c that is bent outward by hemming and extends downward. As shown in FIG. 3, the folded portion 11c extends along the extension direction of the outer frame material 11 (the circumferential direction of the outer frame 10). As shown in FIG. 2, the outer frame 10 is fixed to the base material 100b of the ceiling material 100 with screws 18 that penetrate the side wall 11a and the folded portion 11c from the inside. In this way, by providing the folded portion 11c at the portion of the side wall 11a that is fixed to the ceiling material 100, the rigidity of that portion is increased. Therefore, compared to using an outer frame material with a thicker plate and increased rigidity, it is possible to make the outer frame 10 relatively lightweight while suppressing deformation of the outer frame 10 when fixed to the ceiling material 100. The outer flange portion 11b supports the end of the ceiling board 100a from below when the outer frame 10 is fixed to the base material 100b. An airtight packing (not shown) is provided on the outer flange portion 11b to fill the gap between the outer flange portion 11b and the ceiling board 100a.

[0019] The inner frame 20 is assembled to the opening 14 of the outer frame 10 via an opening / closing mechanism (not shown) so as to be openable and closable. The inner frame 20 is also made of an iron alloy. More specifically, in this embodiment, the inner frame 20 is made of hot-dip galvanized steel plate. The inner frame 20 may also be made of other iron alloys (such as stainless steel plate) or iron. As shown in FIG. 4 , the inner frame 20 is formed into a rectangular shape by four linearly extending inner frame members 21 connected to each other by angled corner fittings 22. The inner frame 20 is formed to a size that can be placed within the opening 14 of the outer frame 10.

[0020] As shown in FIG. 2, the inner frame material 21 is formed by bending a thin steel plate and has side walls 21a facing the outer frame material 11, outer flange portions 21b projecting outward from the lower ends of the side walls 21a, and a mounting flange 21c fixed to the underside of the outer flange portions 21b. As shown in FIG. 4, four inner frame materials 21 are connected by square metal fittings 22, so that the four side walls 21a form a rectangular annular side wall 23. An opening 24 is formed within the annular side wall 23. The outer flange portions 21b are formed over the entire length of the side walls 21a in the extension direction. Therefore, when the four inner frame materials 21 are connected by the square metal fittings 22, the four outer flange portions 21b also form a rectangular annular flange.

[0021] 2, the upper part of the side wall 21a is formed by bending to form a horizontal portion 21a1 extending outward and a vertical portion 21a2 extending downward from the tip of the horizontal portion 21a1. This improves the rigidity of the inner frame material 21 without increasing the thickness of the inner frame material 21 itself. This makes it possible to suppress deformation of the inner frame 20 while making the inner frame 20 relatively lightweight.

[0022] As shown in FIG. 4, two of the four inner frame members 21 are provided with two pressing members 25. The pressing members 25 are L-shaped, disposed within the opening 24, and attached to the side wall 21a with screws 28. As shown in FIG. 2, the mounting flange 21c has an outer portion 21c1 located outside the side wall 21a and an inner portion 21c2 located inside the side wall 21a. When the annular side wall 23 of the inner frame 20 is disposed within the opening 14 of the outer frame 10, the outer portion 21c1 faces the lower surface of the outer flange portion 11b, and its tip is located outside the tip of the outer flange portion 11b. An airtight packing (not shown) is provided on the outer portion 21c1 to fill the gap between the outer flange portion 11b and the outer flange portion 11b. As shown in FIG. 4, the mounting flange 21c is formed over the entire length of the outer flange 21b in the extension direction. Therefore, when the four inner frame members 21 are connected by the corner fittings 22, the four mounting flanges 21c also form a rectangular annular mounting flange.

[0023] 2, the cover 30 is attached to the mounting flange 21c so as to cover the entire lower surface of the inner frame 20. In this embodiment, the cover 30 is made of ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin), but may be made of other synthetic resins.

[0024] The lid material 40 is formed by cutting a plate material made of the same material as the ceiling panel 100a into a shape and size that can be accommodated within the opening 24 of the inner frame 20. The lid material 40 is placed on the inner portion 21c2 of the mounting flange 21c of the inner frame 20, and its upper surface is pressed down by the pressing member 25, thereby attaching it to the inner frame 20. The material of the lid material 40 may be changed to a material different from that of the ceiling panel 100a, as appropriate.

[0025] The thermal expansion materials 51, 52 are strip-shaped sheets made of the same material. Being in sheet form allows them to be easily attached to the outer surfaces (e.g., sidewalls 11a, outer flanges 21b) of the outer frame material 11 and the inner frame material 21 using adhesive, double-sided tape, or the like (see FIG. 2). In this embodiment, the thermal expansion materials 51, 52 are commercially available thermal expansion materials manufactured by mixing a high-molecular polymer with an inorganic filler and a thermally expandable compound. The thermal expansion materials 51, 52 may be any material that expands several to several tens of times in thickness upon heating to form a heat insulating layer. For example, a wide variety of known materials can be used. More specifically, commercially available materials such as a synthetic resin base material containing a phosphorus compound or thermally expandable graphite, or a ceramic fiber blend containing a thermally expandable inorganic material and a small amount of organic and inorganic binders can be used.

[0026] As shown in FIG. 2, the thermal expansion materials 51 (first thermal expansion materials) are disposed between the inner frame 20 and the outer frame 10, on the outer flange portions 21b of the inner frame members 21. As shown in FIGS. 1 and 4, the four thermal expansion materials 51 are disposed along the entire length of the inner frame member 21 in the direction in which the inner frame member 21 extends (the circumferential direction of the inner frame 20), with the ends of adjacent thermal expansion materials 51 in contact with each other. That is, the four thermal expansion materials 51 are disposed along the entire circumference of the inner frame 20. The thermal expansion materials 51 may be partially interrupted, or the ends of adjacent thermal expansion materials 51 may not be in contact with each other. The thermal expansion materials 51 are disposed between the sidewall 21a and the tip of the outer flange portion 21b in the direction in which the outer flange portion 21b protrudes. This prevents the thermal expansion materials 51 from protruding beyond the tip of the outer flange portion 21b when not heated by a fire or the like. This prevents the opening and closing operation of the inner frame 20 from being hindered, and also improves the design.

[0027] In addition, when outer flange portion 21b is not provided and mounting flange 21c is formed at the lower end of side wall 21a, outer portion 21c1 may be used as the outer flange portion, and thermal expansion material 51 may be disposed between side wall 21a and the tip of outer portion 21c1. In this case, the same effect as described above can be obtained.

[0028] As a modified example, the thermal expansion material 51 may be disposed on at least one of the outer surface of the side wall 21a (the surface facing the side wall 11a) and the inner surface of the side wall 11a (the surface facing the side wall 21a). The cross-sectional shape of the thermal expansion material 51 may be circular, elliptical, triangular, polygonal, or the like, and may have a shape other than a strip shape.

[0029] As shown in Fig. 2, the thermal expansion material 52 (second thermal expansion material) is provided on the outer surface of the outer frame 10, in a portion facing the ceiling material 100. More specifically, it is arranged at the lower end of each side wall 11a of the outer frame material 11. Furthermore, when arranged on the outer surface of the side wall 11a, the thermal expansion material 52 is made thick enough not to protrude beyond the outer surface of the folded portion 11a. This prevents it from interfering with the attachment of the outer frame 10 to the ceiling material 100.

[0030] As shown in FIGS. 1 and 3 , the thermal expansion material 52 extends longitudinally along the extension direction of the outer frame material 11 (the circumferential direction of the outer frame 10). In this embodiment, the thermal expansion material 52 is disposed at the lower end of the side wall 11a, except for the portion overlapping with the corner metal fitting 12. However, the thermal expansion material 52 may be disposed along the entire periphery of the outer frame 10. That is, four thermal expansion materials 52 may be disposed along the entire length of the outer frame material 11, with the ends of adjacent thermal expansion materials 52 in contact with each other. The thermal expansion material 52 is disposed between the side wall 11a and the tip of the outer flange portion 11b in the direction of protrusion of the outer flange portion 11b. This prevents the thermal expansion material 52 from protruding beyond the tip of the outer flange portion 11b when not heated by a fire or the like. This allows the ceiling inspection hatch 1 to be attached to the opening (opening 101) in the ceiling (ceiling material 100) in the same manner as before, improving the design. Furthermore, even if the thermal expansion material 52 protrudes outward beyond the tip of the outer flange portion 11b, if it is only a small amount, by using an elastic thermal expansion material 52, it can function as a gasket that prevents gaps from occurring between the ceiling material 100 and the outer frame 10.

[0031] As a modification, the thermal expansion material 52 may be disposed above the lower end of the side wall 11 a, or may be disposed on the outer flange portion 11 b. The cross-sectional shape of the thermal expansion material 52 may be circular, elliptical, triangular, polygonal, or the like, and may have a shape other than a strip shape.

[0032] Next, the situation when the ceiling inspection hatch 1 is heated will be described below with reference to FIGS. 2 and 5. As shown in FIG. 5, the ceiling inspection hatch 1 is heated from below in the event of a fire or other disaster. When heated to a predetermined temperature (e.g., 200°C) or higher, the thermal expansion materials 51 and 52 begin to expand and change from the state shown in FIG. 2 to the state shown in FIG. 5. When the thermal expansion material 51 is below the predetermined temperature, as shown in FIG. 2, it does not fill the gap between the outer frame 10 (outer frame material 11) and the inner frame 12 (inner frame material 21), resulting in a gap. When the thermal expansion material 52 is below the predetermined temperature, as shown in FIG. 2, it does not fill the gap between the outer frame 10 (outer frame material 11) and the ceiling material 100 (ceiling panel 100a), resulting in a gap. As the thermal expansion materials 51 and 52 are heated, the gap between the inner frame 20 and the outer frame 10 is filled with the thermal expansion material 51, and the gap between the outer frame 10 and the ceiling material 100 is filled with the thermal expansion material 52. As a result, even if heat and flames from a fire reach the ceiling inspection hatch 1 along the ceiling material 100 (ceiling board 100a) as shown by the arrows in Figure 5, it is possible to prevent them from rising through the gap between the inner frame 20 and the outer frame 10 or the gap between the outer frame 10 and the ceiling material 100. In other words, the thermal expansion materials 51 and 52 enable heat and flame insulation upward from the ceiling inspection hatch 1.

[0033] As described above, in the ceiling inspection hatch 1 of this embodiment, the thermal expansion material 51 expands due to heat during a fire and fills the gap between the outer frame 10 and the inner frame 20. This makes it difficult for fire or heat to spread through the gap, improving fire resistance.

[0034] Furthermore, since the thermal expansion material 52 is provided in the outer frame 10, even if a gap occurs between the outer frame 10 and the ceiling material 100, the thermal expansion material 52 expands due to the heat during a fire and fills the gap. This makes it difficult for fire or heat to spread through the gap, further improving fire resistance. As a result, the ceiling inspection hatch 1 is more likely to have 45-minute quasi-fire resistance.

[0035] Furthermore, the outer frame 10 and the inner frame 20 are made of an iron alloy. This makes the melting points of the outer frame 10 and the inner frame 20 relatively high. This further improves fire resistance. As a result, it is possible to reliably achieve 45-minute quasi-fire resistance. Note that even if the outer frame 10 and the inner frame 20 are made of iron, the same effects as those described above can be obtained.

[0036] While preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and various modifications are possible within the scope of the claims. For example, although the thermal expansion materials 51 and 52 in the above-described embodiments extend longitudinally along the length of the outer frame material 11 and the inner frame material 21, multiple thermal expansion materials may be arranged spaced apart along the length. In this case, the distance between adjacent thermal expansion materials is preferably such that the heated and expanded thermal expansion materials can come into contact with each other. Furthermore, four thermal expansion materials 51 are arranged in the gap between the outer frame 10 and the inner frame 20, but one to three or five or more thermal expansion materials may be arranged. Furthermore, four thermal expansion materials 52 are arranged in the gap between the outer frame 10 and the ceiling material 100, but one to three or five or more thermal expansion materials may be arranged.

[0037] In the above-described embodiment, the gap between the inner frame 20 and the lid 40 is very small, so no thermal expansion material is provided. However, one or more thermal expansion materials may be provided in the gap. This allows the thermal expansion material to expand due to the heat generated by a fire and fill the gap between the inner frame 20 and the lid 40. This makes it more difficult for fire to spread through the gap, further improving fire resistance. As a result, the ceiling inspection hatch 1 is likely to achieve 45-minute quasi-fire resistance or higher. Furthermore, in this case, it is preferable that the thermal expansion material be positioned between the side wall 21a and the tip of the inner portion 21c2 in the protruding direction of the mounting flange 21c. This prevents the thermal expansion material from protruding inward beyond the tip of the inner portion 21c2 when not heated by a fire or other source. This enhances the design.

[0038] Furthermore, in the above-described embodiment, both the outer frame 10 and the inner frame 20 are made of an iron alloy, but they may also be made of iron, or one of the frames may be made of iron or an iron alloy, or both the outer frame 10 and the inner frame 20 may be made of a material other than iron or an iron alloy.

[0039] In the above-described embodiment, an example was shown in which a single sheet of ceiling material 100 was used. However, there may be cases in which the ceiling material is relatively thick, such as when the ceiling material 100 is double-layered, and in the ceiling inspection hatch 1 shown in this embodiment, the height dimension of the side wall 11a of the outer frame 10 is made relatively high, which makes it possible to adjust the height position at which the screws 18 are driven into the side wall 11a and / or the base material 100b. [Explanation of symbols]

[0040] 1 Ceiling inspection hatch 10 Outer Frame 11a side wall 11b Outer flange 14 Openings 20 Inner Frame 21a side wall 21b Outer flange 51 Thermal expansion material (first thermal expansion material) 52 Thermal expansion material (second thermal expansion material) 100 Ceiling materials 101 Opening

Claims

1. A ceiling inspection hatch comprising an outer frame attached to an opening in a ceiling material and an inner frame assembled to the opening of the outer frame so as to be able to open and close, A ceiling inspection hatch characterized in that a first thermal expansion material is provided between the outer frame and the side wall of the inner frame facing the outer frame.

2. the inner frame has an outer flange portion that protrudes outward from a lower end of the side wall, 2. The ceiling inspection hatch according to claim 1, wherein the first thermal expansion material is disposed between the side wall and the tip of the outer flange portion in the protruding direction of the outer flange portion.

3. 3. The ceiling inspection hatch according to claim 1, wherein a second thermal expansion material is provided on the outer surface of the outer frame, in a portion facing the ceiling material.

4. the outer frame has a side wall facing the ceiling material and an outer flange portion extending outward from a lower end of the side wall of the outer frame, The ceiling inspection hatch described in claim 3, characterized in that the second thermal expansion material is arranged between the side wall of the outer frame and the tip of the outer flange portion of the outer frame in the protruding direction of the outer flange portion of the outer frame.

5. A ceiling inspection hatch comprising an outer frame attached to an opening in a ceiling material and an inner frame assembled to the opening of the outer frame so as to be able to be opened and closed, The outer frame has a side wall and an outer flange portion that protrudes outward from a lower end of the side wall, the inner frame has a side wall facing the side wall of the outer frame, an outer flange portion extending outward from a lower end of the side wall of the inner frame, and a mounting flange fixed to a lower surface of the outer flange portion of the inner frame, a thermal expansion material is provided between the side wall of the outer frame and the side wall of the inner frame, A ceiling inspection hatch characterized in that an airtight packing is provided between the mounting flange and the outer flange portion of the outer frame.

6. A ceiling inspection hatch having an outer frame attached to an opening in a ceiling material and an inner frame assembled to the opening of the outer frame so as to be able to be opened and closed, The outer frame has a side wall and an outer flange portion that protrudes outward from a lower end of the side wall, the inner frame has a side wall that faces the side wall of the outer frame, a thermal expansion material is provided between the side wall of the outer frame and the side wall of the inner frame, A ceiling inspection hatch characterized in that an airtight gasket is provided on the outer flange portion of the outer frame to fill the gap between the outer flange and the ceiling material.

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