Fireproof ceiling inspection port

Abstract

To provide a fireproof ceiling inspection port capable of enhancing fire resistance.SOLUTION: A fireproof ceiling inspection port 1 provided in an opening formed in a ceiling includes an outer frame 2, an inner frame 3, an inner board material 6, and a shrinkage suppression metal material 60. The outer frame 2 is disposed at the edge of the opening. The inner frame 3 is openable and closable with respect to the outer frame 2. The inner board material 6 is arranged on an inner side surrounded by the inner frame 3 and is made of a fireproof material. The shrinkage suppression metal material 60 is a metal material that suppresses the inner board member 6 from shrinking due to heat. The shrinkage suppression metal material 60 includes a first elongated material 61 and a second elongated material 62. The first elongated member 61 and the second elongated member 62 fix the inner board member 6. The first elongated member 61 and the second elongated member 62 are connected to each other in a crossing direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a fire-resistant ceiling access hatch. [Background technology]

[0002] A ceiling inspection hatch is described in Patent Document 1. The ceiling inspection hatch described in Patent Document 1 includes an outer frame provided in an opening in the ceiling, and an inner frame that opens and closes relative to the outer frame.

[0003] The ceiling inspection hatch described in Patent Document 1 has a small number of parts and allows the ceiling finishing panel to be attached to the inner frame with simple work. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-308981 Summary of the Invention [Problem to be solved by the invention]

[0005] However, while the ceiling inspection hatch described in Patent Document 1 can be easily installed, like regular ceiling inspection hatches, it does not have sufficient fire resistance. Therefore, in the event of a fire, the ceiling inspection hatch described in Patent Document 1 may fall off the ceiling.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a fire-resistant ceiling inspection hatch that can improve fire resistance. [Means for solving the problem]

[0007] A fire-resistant ceiling inspection hatch according to one aspect of the present invention is provided in an opening formed in a ceiling. The fire-resistant ceiling inspection hatch comprises an outer frame, an inner frame, an inner board material, and a shrinkage-restricting metal material. The outer frame is disposed on the edge of the opening. The inner frame can be opened and closed freely relative to the outer frame. The inner board material is disposed inside the inner frame and is made of a fire-resistant material. The shrinkage-restricting metal material is a metal material that restricts the shrinkage of the inner board material due to heat. The shrinkage-restricting metal material has a first elongated material and a second elongated material. The first elongated material and the second elongated material secure the inner board material. The first elongated material and the second elongated material are connected to each other in intersecting directions. [Effects of the Invention]

[0008] The fire-resistant ceiling inspection hatch of the present invention can improve fire resistance. [Brief explanation of the drawings]

[0009] [Figure 1A] This is a perspective view of the fireproof ceiling inspection hatch in a closed state. [Figure 1B] This is a perspective view of the fireproof ceiling inspection hatch in an open state. [Figure 2A] 1B is a cross-sectional view corresponding to FIG. 1A, showing an enlarged view of the outer frame and the inner frame. [Figure 2B] FIG. 1C is a cross-sectional view corresponding to FIG. 1B, showing an enlarged view of the outer frame and the inner frame. [Figure 3] This is a view looking up at the fireproof ceiling inspection hatch from below. [Figure 4] FIG. 2 is an enlarged, partially cutaway perspective view of the shrinkage-restricting metal material and the inner board material. [Figure 5] FIG. 2B is a cross-sectional view corresponding to FIG. 2A, showing a state in which a flame is generated from below the ceiling. [Figure 6] 4 is an enlarged cross-sectional view showing the vicinity of the flame guide ramp in FIG. 3 in a further enlarged manner. FIG. [Figure 7A] FIG. 2 is a view of the first and second elongated members in the first arrangement viewed from below. [Figure 7B] FIG. 10 is a view of the first and second elongated members in the second arrangement viewed from below. [Figure 7C]FIG. 10 is a view of the first and second elongated members in the third arrangement viewed from below. [Figure 8] FIG. 10 is an enlarged, partially cutaway perspective view of a first elongated member, a second elongated member, and an inner board member in another arrangement. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0011] In the following description, terms indicating specific positions and directions may be used, but these terms are used for convenience to facilitate understanding of the contents of the embodiments and have no relation to the directions in which the embodiments are actually implemented.

[0012] A fire-resistant ceiling inspection hatch 1 according to this embodiment will be described with reference to FIGS. 1A, 1B, 2A, 2B, and 3.

[0013] FIG. 1A is a perspective view of the fireproof ceiling inspection hatch 1 in a closed state. FIG. 1B is a perspective view of the fireproof ceiling inspection hatch 1 in an open state. FIG. 2A is a cross-sectional view corresponding to FIG. 1A, showing an enlarged view of the outer frame 2 and inner frame 3. FIG. 2B is a cross-sectional view corresponding to FIG. 1B, showing an enlarged view of the outer frame 2 and inner frame 3. FIG. 3 is a view of the fireproof ceiling inspection hatch 1 looking up from below.

[0014] As shown in Figures 1A and 1B, the ceiling T has a joist w. The joist w is made of a combustible material (for example, wood). As shown in Figure 1B, the ceiling T has an opening o. A fire-resistant ceiling inspection hatch 1 is provided in the opening o of the ceiling T. Hereinafter, the side closer to the center c of the opening o will be referred to as the "inside," and the side away from the center c of the opening o will be referred to as the "outside."

[0015] The fire-resistant ceiling inspection hatch 1 comprises an outer frame 2 and an inner frame 3. The outer frame 2 is disposed on the edge of the opening o. The inner frame 3 can be opened and closed relative to the outer frame 2.

[0016] 2A and 2B, the fire-resistant ceiling inspection hatch 1 further includes an inner board material 6 and a shrinkage-restricting metal material 60. The inner board material 6 is made of a fire-resistant material and is arranged inside the inner frame 3. The shrinkage-restricting metal material 60 is a metal material that restricts the inner board material 6 from shrinking due to heat.

[0017] 3, the shrinkage-reducing metal material 60 has a first elongated member 61 and a second elongated member 62. Both the first elongated member 61 and the second elongated member 62 fix the inner board material 6. The first elongated member 61 and the second elongated member 62 are connected to each other in intersecting directions.

[0018] Therefore, even when heat from a fire is applied to the inner board material 6, the first elongated material 61 and the second elongated material 62 suppress shrinkage. As a result, the fire-resistant ceiling inspection hatch 1 can improve fire resistance by preventing the inner board material 6 from falling off the inner frame 3. Note that the intersection of the first elongated material 61 and the second elongated material 62 means that the longitudinal directions of the first elongated material 61 and the second elongated material 62 intersect.

[0019] The first elongated member 61 and the second elongated member 62 are fixed to the inner board material 6 by, for example, screws 68. The fire-resistant material of the inner board material 6 is a material that has fire resistance and fire prevention properties. The fire-resistant material is, for example, reinforced gypsum board defined by the Japanese Industrial Standards (JIS). In other words, reinforced gypsum board is gypsum board mixed with inorganic fibers, etc.

[0020] The outer frame 2, inner frame 3, and shrinkage-reducing metal material 60 are made of metal. The outer frame 2, inner frame 3, and shrinkage-reducing metal material 60 are preferably made of a metal with a melting point higher than that of aluminum. The outer frame 2 and inner frame 3 are made of, for example, steel, iron, or stainless steel.

[0021] The shrinkage-controlling metal material 60 will be described in detail below with reference to Figures 3 and 4. Figure 4 is a partially cutaway perspective view showing the shrinkage-controlling metal material 60 and the inner board material 6 on an enlarged scale.

[0022] As shown in Figure 3, there are two first long members 61 and two second long members 62. The two first long members 61 are parallel to each other. The two second long members 62 are also parallel to each other. The two second long members 62 are on the same plane as the first long member 61 and perpendicular to the first long member 61. The two first long members 61 and two second long members 62 each fix the peripheral edge of the inner board material 6 in a rectangular shape.

[0023] Therefore, the peripheral edge of the inner board material 6 is fixed, which further suppresses shrinkage due to heat. As a result, the fire-resistant ceiling inspection hatch 1 can have even greater fire resistance.

[0024] The shrinkage-reducing metal material 60 further includes a third elongated member 63. The third elongated member 63 fixes the inner board material 6. The third elongated member 63 is connected between the two first elongated members 61 and perpendicular to the two second elongated members 62.

[0025] Therefore, the inner board material 6 is fixed at the peripheral edge and inside thereof, further suppressing shrinkage due to heat. As a result, the fire-resistant ceiling inspection hatch 1 can have even greater fire resistance. Note that the first elongated material 61 and the second elongated material 62 being perpendicular to each other means that the longitudinal directions of the first elongated material 61 and the second elongated material 62 are perpendicular to each other.

[0026] The third long member 63 is connected to the second long member 62 at (or near) the middle of the second long member 62. Each of the two second long members 62 has a notch 67 on the inside at the middle portion. The tip of the third long member 63 is fitted into the notch 67.

[0027] Therefore, the second long material 62 is stably connected to the third long material 63 by the notch 67. The stable connection between the second long material 62 and the third long material 63 allows the first long material 61 to the third long material 63 to stably fix the inner board material 6. The third long material 63 fixes the inner board material 6 by, for example, the notch 67 and a screw 68 at the center c.

[0028] 4, the inner board material 6 has a lower inner board 6L and an upper inner board 6H. The upper inner board 6H is placed on top of the lower inner board 6L. The shrinkage-restricting metal material 60 is placed between the lower inner board 6L and the upper inner board 6H.

[0029] Therefore, the upper inner board 6H and the lower inner board 6L are firmly fixed by the shrinkage-restricting metal material 60 between them, further suppressing shrinkage due to heat. As a result, the fire-resistant ceiling inspection hatch 1 can have even greater fire resistance.

[0030] The thickness of each of the upper inner board 6H and the lower inner board 6L is preferably 12.5 mm or 15 mm (both including a ±10% tolerance). When the inner board material 6 is a single piece, the thickness is preferably 12.5 mm, 15 mm (both including a ±10% tolerance), or more (preferably 25 mm or less).

[0031] The first long material 61 and the second long material 62 each have a parallel portion 65 and a rising portion 66. The parallel portion 65 is parallel to the inner board material 6. The rising portion 66 rises from the edge of the parallel portion 65. The rising portion 66 abuts against the end face of the inner board material 6.

[0032] Therefore, the first long material 61 and the second long material 62 are arranged so that the rising portions 66 abut the end faces of the inner board material 6. As a result, the fire-resistant ceiling inspection hatch 1 can be easily installed by facilitating the arrangement of the first long material 61 and the second long material 62.

[0033] Screw holes 69 are formed in the parallel portion 65 by passing screws 68 through them. The rising portion 66 rises from the outer edge of the long side of the parallel portion 65. The rising portion 66 abuts against the lower part of the end face of the upper inner board 6H. The screws 68 pass through the screw holes 69 in the parallel portion 65 but do not pass through the inner board material 6.

[0034] A configuration for weakening flames caused by a fire will be described below with reference to Fig. 5. Fig. 5 is a cross-sectional view corresponding to Fig. 2A showing a state in which flames are generated from below the ceiling T.

[0035] As shown in Figure 5, the fire-resistant ceiling inspection hatch 1 further includes a flame guide ramp 5. The flame guide ramp 5 is located between the outer frame 2 and the inner frame 3. The flame guide ramp 5 is inclined relative to the vertical V so that the higher it is, the more inward it is positioned. The flame guide ramp 5 guides flames from below the ceiling T while weakening them.

[0036] Therefore, the flame is weakened and guided inward as it moves upward by the flame guide ramp 5. As a result, the fire-resistant ceiling inspection hatch 1 suppresses damage to the joist w due to heat, thereby improving fire resistance.

[0037] The fire-resistant ceiling inspection hatch 1 further includes a fire-resistant member 4 between the rafters and the outer frame. The fire-resistant member 4 is made of the same fire-resistant material as the interior board material 6. Therefore, the flame weakened and guided by the flame guide ramp moves away from the rafters w and is blocked by the fire-resistant member 4 between the rafters w. As a result, the fire-resistant ceiling inspection hatch 1 suppresses damage to the rafters w due to heat, thereby improving fire resistance.

[0038] The ceiling T further includes a ceiling panel p. The upper surface of the ceiling panel p is in surface contact with the underside of the joist w. The underside of the fire-resistant member 4 is in surface contact with the upper surface of the ceiling panel p. Because the upper surface of the ceiling panel p is in surface contact with the undersides of both the fire-resistant member 4 and the joist w, the fire-resistant member 4 and the joist w are flush with each other on their undersides. The upper surface of the fire-resistant member 4 is located higher than the upper surface of the joist w. Therefore, the fire-resistant ceiling inspection hatch 1 can enhance its fire resistance because the fire-resistant member 4 suppresses damage to the joist w caused by heat.

[0039] The horizontal thickness of the fire-resistant member 4 is preferably 12.5 mm or 15 mm (both of which include an error of ±10%). By making the horizontal thickness 12.5 mm or 15 mm, the fire-resistant ceiling inspection hatch 1 can be made smaller while still improving its fire resistance.

[0040] The flame guide ramp and its surroundings will be described in detail below with reference to Figures 5 and 6. Figure 6 is an enlarged cross-sectional view showing the vicinity of the flame guide ramp 5 in Figure 5 in a further enlarged scale.

[0041] As shown in FIG. 5, the outer frame 2 has an outer bottom portion 21, an outer vertical portion 23, and an inner top portion 24. The outer bottom portion 21 is positioned to receive a ceiling panel p. The outer vertical portion 23 extends upward from the inner end of the outer bottom portion 21. The outer vertical portion 23 has through holes 28 for fastening to the fire-resistant member 4 and the joist w. The inner top portion 24 protrudes inward from the upper end of the outer vertical portion 23. The inner top portion 24 is positioned higher than the inner frame 3 when it is closed.

[0042] The fire-resistant ceiling inspection hatch 1 further includes an airtight material 7, a fixing screw 8, and a mounting member 9.

[0043] The airtight material 7 comprises, in order from the inside out, a first airtight material 71, a second airtight material 72, and a third airtight material 73. The first airtight material 71 is arranged between the inner bottom 31 of the inner frame 3 and the inner board material 6. The second airtight material 72 is arranged on the underside of the inner top portion 24 of the outer frame 2. The second airtight material 72 receives the outer top portion 34 of the inner frame 3 when the inner frame 3 is closed against the outer frame 2. The third airtight material 73 is arranged between the outer bottom 21 of the outer frame 2 and the ceiling board p.

[0044] The fixing screws 8 are attached to the joist w through the through holes 28 in the outer vertical portions 23 and the fire-resistant members 4. In other words, the fixing screws 8 fix the outer frame 2 to the joist w. The fixing screws 8 have, from the inside out, a head 81, a cylindrical portion 82, and a threaded portion 83. The head 81 is located on the inside of the outer vertical portions 23, the cylindrical portion 82 passes through the through holes 28, and the threaded portion 83 reaches the joist w.

[0045] As shown in Figure 6, the mounting member 9 is attached to the inner surface of the outer vertical portion 23 by a mounting pin 90. The mounting member 9 has, from bottom to top, an outer inclined portion 91, a curved horizontal portion 92, and a mounting portion 93. The outer inclined portion 91 is inclined so that it is positioned more inward as it goes upward. The outer inclined portion 91 forms a flame guide ramp 5 together with the inner inclined portion 32 of the inner frame 3. The curved horizontal portion 92 connects the outer inclined portion 91 and the mounting portion 93. The mounting portion 93 abuts against the outer vertical portion 23 of the outer frame 2. The mounting portion 93 and the outer vertical portion 23 have a mounting hole 99. The mounting pin 90 passes through the mounting hole 99.

[0046] The mounting member 9 is not limited to being attached to the outer frame 2, but may be attached to the inner frame 3, or may be attached to a location other than the outer frame 2 and the inner frame 3. The portion connecting the outer inclined portion 91 and the mounting portion 93 is not limited to the curved horizontal portion 92, but may be a member with a shape other than a curved shape, such as a bending member.

[0047] When the lower surface of the outer inclined portion 91 is referred to as the upper inclined surface 59 and the upper surface of the inner inclined portion 32 is referred to as the lower inclined surface 53, the flame guide ramp 5 is defined by the upper inclined surface 59 and the lower inclined surface 53. The upper inclined surface 59 and the lower inclined surface 53 are arranged with a space between them. The upper inclined surface 59 and the lower inclined surface 53 are parallel to each other.

[0048] Therefore, the flame guide ramp 5 is a parallel space, which further weakens the flame guided therethrough. As a result, the fire-resistant ceiling inspection hatch 1 further suppresses damage to the joist w due to heat, thereby further improving fire resistance.

[0049] The spacing between the upper and lower slopes 59, 53 is preferably less than 1.0 mm, more preferably less than 0.7 mm, and most preferably less than 0.5 mm, because the preferred spacing of the flame guide ramp 5 further attenuates the flame being guided therethrough.

[0050] The angle θ between the upper inclined surface 59 and the lower inclined surface 53 and the vertical V is preferably 20° or more and less than 45°, more preferably 25° or more and less than 40°, and most preferably 30° or more and less than 35°. This is because the flame guide ramp 5 has a preferred angle θ, which further weakens the flame guided therethrough.

[0051] The flame guide ramp 5 may be formed on one side of the opening o which constitutes the four sides in a plan view, or on all four sides (all around). Of course, it is preferable that the flame guide ramp 5 is formed on the entire periphery of the opening o, as this further weakens the guided flame.

[0052] Other horizontal arrangements (first to third arrangements) of the first elongated members 61 and the second elongated members 62 will be described below with reference to Figures 7A to 7C. Figure 7A is a view looking up from below at the first elongated members 61 and the second elongated members 62 in the first arrangement. Figure 7B is a view looking up from below at the first elongated members 61 and the second elongated members 62 in the second arrangement. Figure 7C is a view looking up from below at the first elongated members 61 and the second elongated members 62 in the third arrangement.

[0053] As shown in Fig. 7A, the first long members 61 and the second long members 62 may be arranged in an H-shape. Specifically, there are two first long members 61 and one second long member 62. The two first long members 61 are parallel to each other. The second long member 62 is connected between the two first long members 61 and perpendicular to the two first long members 61. Although not shown, the two first long members 61 may have notches formed in the portions where the second long member 62 is connected.

[0054] 7B, the first long member 61 and the second long member 62 may be arranged in a T-shape. Specifically, there is one first long member 61 and one second long member 62. The second long member 62 is connected to the first long member 61 at (or near) the middle of the first long member 61. Although not shown, the first long member 61 may have a notch formed in the portion where the second long member 62 is connected.

[0055] 7C, the first long member 61 and the second long member 62 may be arranged in an L-shape. Specifically, there is one first long member 61 and one second long member 62. The second long member 62 is connected to the first long member 61 at the tip end of the first long member 61.

[0056] The arrangements of the first elongated member 61 and the second elongated member 62 shown in FIGS. 7A to 7C are merely examples, and it is sufficient that the first elongated member 61 and the second elongated member 62 are connected to each other in intersecting directions.

[0057] Another arrangement of the first long material 61 and the second long material 62 in the vertical direction will be described below with reference to Fig. 8. Fig. 8 is an enlarged, partially cutaway perspective view of the first long material 61, the second long material 62, and the inner board material 6 in another arrangement.

[0058] As shown in Figure 8, the parallel portions 65 of the first elongated member 61 and the second elongated member 62 abut against the upper surface of the inner board material 6. When the inner board material 6 has an upper inner board 6H and a lower inner board 6L, the parallel portions 65 abut against the upper surface of the upper inner board 6H. The rising portions 66 of the first elongated member 61 and the second elongated member 62 abut against the upper end faces of the upper inner board 6H. The screws 68 penetrate the inner board material 6 and pass through the screw holes 69 in the parallel portions 65.

[0059] The vertical arrangement of the first elongated member 61 and the second elongated member 62 shown in FIG. 8 is merely an example, and it is sufficient that the first elongated member 61 and the second elongated member 62 fix the inner board material 6.

[0060] The embodiments of the present invention have been described above with reference to the drawings. However, the embodiments are illustrative in all respects and are not limiting. The scope of the present invention is defined by the claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the claims. Of the configurations described in the embodiments, those other than those described as one aspect of the invention in the "Means for Solving the Problem" are optional configurations and may be deleted or modified as appropriate. [Industrial Applicability]

[0061] The present invention provides a fire-resistant ceiling inspection hatch and has industrial applicability. [Explanation of symbols]

[0062] T ceiling w Noen о Opening 1 Fireproof ceiling inspection hatch 2 Outer frame 3 Inner frame 5. Flame Guide Ramp 6. Inner board material 6L Lower inner board 6H upper inner board 60 Shrinkage-Controlled Metal Materials 61 1st long material 62 Second long material 63 Third long material

Claims

1. A fire-resistant ceiling inspection hatch provided in an opening formed in a ceiling, an outer frame disposed on the edge of the opening; an inner frame that can be opened and closed relative to the outer frame; an inner board material made of a fire-resistant material and arranged inside the inner frame; a shrinkage-inhibiting metal material that inhibits the shrinkage of the inner board material due to heat; Equipped with The shrinkage-reducing metal material has a first elongated member and a second elongated member that fix the inner board material, A fire-resistant ceiling inspection hatch, wherein the first elongated member and the second elongated member are connected to each other in an intersecting direction.

2. There are two first elongated members and two second elongated members, The two first elongated members are parallel to each other, The two second elongated members are parallel to each other, are on the same plane as the first elongated member, and are perpendicular to the first elongated member; 2. The fire-resistant ceiling inspection hatch according to claim 1, wherein each of the first elongated member and the second elongated member, two in number, fixes the peripheral edge of the inner board material in a rectangular shape.

3. The shrinkage-restricting metal material further includes a third elongated member that fixes the inner board material, 3. The fire-resistant ceiling inspection hatch of claim 2, wherein the third elongated member is connected between the two first elongated members and perpendicular to the two second elongated members.

4. The inner board material is A lower inner board; an upper inner board placed on top of the lower inner board; and 4. A fire-resistant ceiling inspection hatch according to claim 1, wherein the shrinkage-reducing metal material is disposed between the lower inner board and the upper inner board.

5. The first elongated material and the second elongated material are both A parallel portion parallel to the inner board material; a rising portion rising from an edge of the parallel portion; and 4. A fire-resistant ceiling inspection hatch according to claim 1, wherein the rising portion abuts against an end face of the inner board material.

6. A flame guide ramp is further provided between the outer frame and the inner frame, the flame guide ramp being inclined so as to be positioned inward as it goes upward relative to the vertical, 4. The fire-resistant ceiling inspection hatch according to claim 1, wherein the flame guide ramp guides a flame from below the ceiling while weakening the flame.

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