Steel door

Abstract

To improve the fire protection performance of a steel door having a combustible gasification element inside the door.SOLUTION: There is provided a steel door (door body 2) having a combustible gasification element inside. One or more first holes 300 are formed on an upper end face 22, an upper portion of the interior space is provided with a dividing plate (upper reinforcing frame 7) located below the upper end face 22 and the dividing plate (upper reinforcing frame 7) is formed with one or more second holes 700. The first holes 300 and the second holes 700 are offset in the width direction of the door body 2.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a steel door, and more particularly to a steel door having fireproof performance.

Background Art

[0002] Generally, a steel door has an outer surface formed from a surface material attached to a four-sided frame, and a core material is filled inside. The core material such as a paper core and the back surface of the surface material are bonded with an adhesive (see Patent Document 1).

[0003] If such a steel door is used as a fireproof steel door, the heat during a fire causes the adhesive, adhesive tape, and contents of the paper core inside the door body to vaporize, generating combustible gas that accumulates inside the door body. Further heating from the fire side may cause the combustible gas to ignite inside the door body, and there is a risk that the flame inside the door body will break out on the non-fire side. Therefore, a steel door having a combustible gasification element inside, such as an adhesive, may not be used as a fireproof facility as it is.

Patent Document 1

Disclosure of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to improve the fireproof performance of a steel door having a combustible gasification element inside.

Means for Solving the Problems

[0005] The technical means adopted by the present invention is a steel door having a combustible gasification element inside, wherein one or more first holes are formed on the upper end surface, a partition plate is provided in the upper part of the internal space, positioned below the upper end surface, and one or more second holes are formed in the partition plate. It is a steel door. The shapes of the first hole and the second hole are not limited as long as they allow the flow of gas, and they may be notches or gaps. The partition plate may be also used as a partition plate by a member having functions other than partitioning or a part of the member. In one aspect, the steel door includes a steel surface material, and a core material such as a paper core is filled in the internal space of the door. The core material and the back surface of the surface material are adhered by an adhesive, and the adhesive becomes a combustible gasification element. There is a possibility that the adhesive vaporizes when heated to a predetermined high temperature and combustible gas is generated. The first hole functions as an exhaust hole for combustible gas.

[0006] In one aspect, the first hole and the second hole are offset so as not to communicate in the height direction of the door. In one aspect, a plurality of first holes are formed on the upper end surface at intervals in the width direction of the door. A plurality of second holes are formed in the partition plate at intervals in the width direction of the door. The plurality of first holes and the plurality of second holes are offset so as not to communicate in the height direction of the door.

[0007] By arranging the upper first hole and the lower second hole so as not to communicate in the height direction of the door, even if combustible gas ignites in the internal space, the flame coming out from the first hole on the upper end surface can be suppressed as much as possible. In one aspect, the first hole and the second hole are offset in the width direction of the door. In one aspect, the first hole and the second hole are offset in the thickness direction of the door. In one aspect, the first hole and the second hole are offset in the width direction and the thickness direction of the door. That is, in a plan view, the first hole and the second hole are separated in an oblique direction.

[0008] In one aspect, the first hole is formed in the upper frame of the steel door. More specifically, at least a part of the upper surface of the upper frame (the exposed surface 30' in the embodiment described later) forms the upper end surface of the door, and the first hole is formed in such a part.

[0009] In one aspect, in the upper part of the door, an upper first upper frame and a lower second upper frame are provided. The first hole is formed in the first upper frame. The second upper frame forms the partition plate. The second hole is formed in the second upper frame. In one aspect, the second upper frame is a reinforcing frame. In one aspect, the second upper frame is provided inside the first upper frame and reinforces the steel door by reinforcing the first upper frame.

[0010] In one aspect, one or more holes are formed in the lower end surface. In addition to the first hole and the second hole in the upper part of the door, by forming holes in the lower end surface, the holes function as intake holes for outside air, and the first hole (exhaust hole) at the upper end and the holes (intake holes) at the lower end cooperate to generate an upward air flow of gas in the internal space of the door when the door is heated during a fire, and enable the efficient discharge from the first hole on the upper end surface without allowing combustible gas to stay in the internal space. In one aspect, the one or more holes are formed in the lower frame of the steel door. More specifically, at least a part of the lower surface of the lower frame forms the lower end surface of the door, and the one or more holes are formed in such a part.

[0011] In one aspect, in the lower part of the internal space of the door, a lower partition plate is provided above the lower end surface. One or more holes are formed in the lower partition plate. In one aspect, the holes formed in the lower end surface and the holes formed in the lower partition plate are offset so as not to communicate in the height direction of the door. In one aspect, a plurality of first lower holes are formed on the lower end surface at intervals in the width direction of the door. A plurality of second lower holes are formed on the lower partition plate at intervals in the width direction of the door. The plurality of first lower holes and the plurality of second lower holes are offset so as not to communicate in the height direction of the door. In one aspect, the plurality of first lower holes and the plurality of second lower holes are offset in the width direction of the door. By arranging the first lower holes and the second lower holes so as not to communicate in the height direction of the door, even if combustible gas ignites in the internal space, the flame is suppressed as much as possible from emerging from the first lower holes on the lower end surface. In one aspect, the first lower holes and the second lower holes are offset in the width direction of the door. In one aspect, the first lower holes and the second lower holes are offset in the thickness direction of the door. In one aspect, the first lower holes and the second lower holes are offset in the width direction and the thickness direction of the door. That is, in plan view, the first lower holes and the second lower holes are spaced apart in an oblique direction.

[0012] In one aspect, a lower first lower frame and an upper second lower frame are provided at the lower part of the door. The first lower holes are formed in the first lower frame. The second lower frame forms the lower partition plate. The second lower holes are formed in the second lower frame. In one aspect, the second lower frame is a reinforcing frame. In one aspect, the second lower frame is provided inside the first lower frame, and by reinforcing the first lower frame, the steel door is reinforced.

Advantages of the Invention

[0013] In the present invention, in a steel door provided with a combustible gasification element inside the door, by actively discharging the combustible gas generated inside the door during a fire, it is possible to prevent the generated combustible gas from staying inside the door and igniting inside the door, thereby improving the fireproof performance of the steel door.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0015] Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view (opening closed position) of the door device according to this embodiment as viewed from the outdoor side. The door device according to this embodiment is a hinged door composed of a four-sided door frame 1 and a door body 2 having a vertically rectangular shape when viewed from the front. The door device according to this embodiment is installed on a wall inside a building and partitions an indoor space. The indoor side space and the outdoor side space partitioned by the door device are spaces inside the building. Note that the door device according to the present invention may partition an outdoor space and an indoor space.

[0016] The door frame 1 is a four-sided frame composed of an upper frame 10 extending horizontally, a lower frame 11 extending horizontally, a leading side vertical frame 12 extending vertically, and a trailing side vertical frame 13 extending vertically. The space surrounded by the four-sided door frame 1 is an opening. A first portion of hinge H is provided at intervals in the height direction on the trailing side vertical frame 13 of the door frame 1. The door body 2 includes a first finding surface 20, a second finding surface 21, an upper end surface 22, a lower end surface 23, a leading side end surface 24, and a trailing side end surface 25. A second portion of hinge H is provided at intervals in the height direction on the trailing side end surface 25, and it is rotatably attached to the trailing side vertical frame 13 of the door frame 1. The door frame 1 according to this embodiment is a steel door frame made of a steel plate. The four-sided door frame 1 is formed by welding the upper frame 10, the lower frame 11, the leading side vertical frame 12, and the trailing side vertical frame 13.

[0017] The first finding surface 20 of the door body 2, the outdoor side portion 220 of the upper end surface 22, the outdoor side portion 230 of the lower end surface 23, the outdoor side portion of the leading side end surface 24, and the outdoor side portion of the trailing side end surface 25 are formed by bending from a first surface material. The second finding surface 21, the indoor side portion 221 of the upper end surface 22, the indoor side portion 231 of the lower end surface 23, the indoor side portion of the leading side end surface 24, and the indoor side portion of the trailing side end surface 25 are formed by bending from a second surface material.

[0018] The door body 2 is provided with a surrounding frame composed of an upper frame 3, a lower frame 4, a leading-edge side vertical frame 5, and a trailing-edge side vertical frame 6. The surrounding frame, the first surface material, and the second surface material of the door body 2 according to this embodiment are a steel door made of a steel sheet. In one aspect, the surrounding frame is formed by welding the upper frame 3, the lower frame 4, the leading-edge side vertical frame 5, and the trailing-edge side vertical frame 6 (it may also be assembled by fitting or the like without welding). The first surface material (the peripheral part of the first finding surface 20, the outdoor side part 220 of the upper end surface 22, the outdoor side part 230 of the lower end surface 23), the second surface material (the peripheral part of the second finding surface 21, the indoor side part 221 of the upper end surface 22, the indoor side part 231 of the lower end surface 23) are fixed to the surrounding frame (fixed by welding, screws, rivets, etc.).

[0019] In the internal space between the back surface of the surface part of the first surface material forming the first finding surface 20 and the back surface of the surface part of the second surface material forming the second finding surface 21, a core material C such as a paper core is filled, and the back surfaces of these, the core material C, and the back surfaces of the first finding surface 20 (the surface part of the first surface material) and the second finding surface 21 (the surface part of the second surface material) are adhered by an adhesive. The adhesive may vaporize when exposed to a predetermined high temperature (for example, the high temperature during a fire) to generate combustible gas, and may catch fire when exposed to a further high temperature.

[0020] The upper frame 3 is a long member extending in the width direction of the door body 2, and has a U-shaped cross-section including an upper surface part 30, a first finding surface 31 hanging down from the outdoor side end of the upper surface part 30, and a second finding surface 32 hanging down from the indoor side end of the upper surface part 30. The upper peripheral part of the first finding surface 20 of the first surface material abuts against the first finding surface 31 of the upper frame 3, and the upper peripheral part of the second finding surface 21 of the second surface material abuts against the second finding surface 32 of the upper frame 3.

[0021] The outdoor side portion 220 of the upper end surface 22 of the first facing material is in contact with the outdoor side part of the upper surface portion 30 of the upper frame 3, the indoor side portion 221 of the upper end surface 22 of the second facing material is in contact with the indoor side part of the upper surface portion 30 of the upper frame 3, the edges of the outdoor side portion 220 of the upper end surface 22 of the first facing material and the indoor side portion 221 of the upper end surface 22 of the second facing material are spaced apart, and the central portion in the expected width direction of the upper surface portion 30 of the upper frame 3 is the exposed surface 30'.

[0022] The lower frame 4 is a long member extending in the width direction of the door body 2, and has a U-shaped cross section including a lower surface portion 40, a first finding surface 41 vertically rising from the outdoor side end of the lower surface portion 40, and a second finding surface 42 vertically rising from the indoor side end of the lower surface portion 40. The peripheral portion below the first finding surface 20 of the first facing material is in contact with the first finding surface 41 of the lower frame 4, and the peripheral portion below the second finding surface 21 of the second facing material is in contact with the second finding surface 42 of the lower frame 4.

[0023] The outdoor side portion 230 of the lower end surface 23 of the first facing material is in contact with the outdoor side part of the lower surface portion 40 of the lower frame 4, the indoor side portion 231 of the lower end surface 23 of the second facing material is in contact with the indoor side part of the lower surface portion 40 of the lower frame 4, the edges of the outdoor side portion 230 of the lower end surface 23 of the first facing material and the indoor side portion 231 of the lower end surface 23 of the second facing material are spaced apart, and the central portion in the expected width direction of the lower surface portion 40 of the lower frame 4 is the exposed surface 40'.

[0024] The door tip side vertical frame 5 is a long member extending in the height direction of the door body 2, and has a U-shaped cross section including an expected surface portion 50, a first finding surface 51 extending toward the door tip side from the outdoor side end of the expected surface portion 50, and a second finding surface 52 extending toward the door tip side from the indoor side end of the expected surface portion 50. The peripheral portion on the door tip side of the first finding surface 20 of the first facing material is in contact with the first finding surface 51 of the door tip side vertical frame 5, and the peripheral portion on the door tip side of the second finding surface 21 of the second facing material is in contact with the second finding surface 52 of the door tip side vertical frame 5.

[0025] The door end side vertical frame 6 is a long member extending in the height direction of the door body 2, and has a prospective surface portion 60, a first finding surface 61 extending from the outdoor side end portion of the prospective surface portion 60 toward the door tip side, and a second finding surface 62 extending from the indoor side end portion of the prospective surface portion 60 toward the door tip side, and has a U-shaped cross section. The peripheral portion on the door end side of the first finding surface 20 of the first surface material abuts on the first finding surface 61 of the door end side vertical frame 6, and the peripheral portion on the door end side of the second finding surface 21 of the second surface material abuts on the second finding surface 62 of the door end side vertical frame 6.

[0026] An upper reinforcing frame 7 is provided inside the upper frame 3 of the door body 2. The upper reinforcing frame 7 is a partition plate that reinforces the upper frame 3 and partitions the upper part of the internal space of the door body 2. The core material C provided in the internal space of the door body 2 is located below the upper reinforcing frame 7. The upper reinforcing frame 7 is a long member extending in the width direction of the door body 2, and has a surface portion 70, a first finding surface 71 vertically rising from the outdoor side end portion of the surface portion 70, and a second finding surface 72 vertically rising from the indoor side end portion of the surface portion 70, and has a U-shaped cross section. Although the upper reinforcing frame 7 according to the present embodiment is a long member, the upper reinforcing frame 7 may be constituted by a plurality of short members provided at intervals in the width direction of the door body 2. In this case, a gap between the respective short members forms a second hole 700 (described later).

[0027] The first finding surface 71 of the upper reinforcing frame 7 abuts on the upper part of the inner surface of the first finding surface 31 of the upper frame 3, the second finding surface 72 abuts on the upper part of the inner surface of the second finding surface 32 of the upper frame 3, the upper end of the first finding surface 71 abuts on the outdoor side corner portion of the inner surface of the upper frame 3, and the upper end of the second finding surface 72 abuts on the indoor side corner portion of the inner surface of the upper frame 3. The length dimension of the upper reinforcing frame 7 according to the present embodiment is the same as the length dimension of the upper frame 3. In the present embodiment, the plate material forming the upper reinforcing frame 7 is thinner than the plate material forming the upper frame 3, but is not limited thereto. In one aspect, the upper reinforcing frame 7 is located inside the upper frame 3 and is fixed to the upper frame 3 by welding or screws.

[0028] The upper end surface of the door body 2 according to this embodiment is formed by an outdoor side portion 220 of a first surface material that abuts against an outdoor side portion of an upper surface portion 30 of the upper frame 3, an indoor side portion 221 of a second surface material that abuts against an indoor side portion of the upper surface portion 30 of the upper frame 3, and an exposed surface 30' of the upper surface portion 30 of the upper frame 3 located between the outdoor side portion 220 and the indoor side portion 221. A plurality of first holes 300 are formed at intervals across the width direction of the door body 2 on the exposed surface 30' of the upper surface portion 30 of the upper frame 3 that forms the upper end surface of the door body 2. In this embodiment, a narrow exposed surface 30' extending in the width direction of the door body 2 is formed, and the first holes 300 are formed on this exposed surface 30'. However, a notch may be partially formed in the outdoor side portion 220 of the first surface material or the indoor side portion 221 of the second surface material, and the first holes 300 may be formed corresponding to the notch. In this embodiment, the first holes 300 are provided at the central portion in the expected direction (thickness direction) of the door body 2. However, by forming the first holes 300 closer to the first finding surface 20 side, the efficiency of exhausting to the external space may be improved.

[0029] The surface portion 70 of the upper reinforcing frame 7 is located below the upper surface portion 30 of the upper frame 3, extends horizontally in parallel with the upper surface portion 30, and partitions the upper portion of the internal space. A plurality of second holes 700 are formed at intervals across the width direction of the door body 2 on the surface portion 70. In this embodiment, the total area of the plurality of first holes 300 and the total area of the plurality of second holes 700 are substantially the same.

[0030] As shown in FIGS. 5 to 7, the plurality of first holes 300 formed on the exposed surface 30' of the upper surface portion 30 of the upper frame 3 that forms the upper end surface 22 of the door body 2 and the plurality of second holes 700 formed on the surface portion 70 of the upper reinforcing frame 7 are offset in the width direction of the door body 2 and are not in communication in the height direction of the door body 2. The gas discharged from the second holes 700 is discharged from the first holes 300 through the space between the upper surface portion 30 of the upper frame 3 and the surface portion 70 of the upper reinforcing frame 7 (see FIG. 8). Even if a flame generated in the upper portion of the internal space tries to flare upward from the second holes 700, hitting the upper surface portion 30 of the upper frame 3 can suppress the flame from directly flaring out from the holes 300 as much as possible.

[0031] A lower reinforcing frame 8 is provided inside the lower frame 4 of the door body 2. The lower reinforcing frame 8 is a partition plate that reinforces the lower frame 4 and partitions the lower part of the internal space of the door body 2. The core material C provided in the internal space of the door body 2 is located above the lower reinforcing frame 8. The lower reinforcing frame 8 is a long member extending in the width direction of the door body 2, and has a U-shaped cross section including a face portion 80, a first finding surface 81 hanging down from the outdoor-side end of the face portion 80, and a second finding surface 82 hanging down from the indoor-side end of the face portion 80. Although the lower reinforcing frame 8 according to the present embodiment is a long member, the lower reinforcing frame 8 may be constituted by a plurality of short members provided at intervals in the width direction of the door body 2. In this case, the gaps between the short members form second lower holes 800 (described later).

[0032] The first finding surface 81 of the lower reinforcing frame 8 abuts against the lower part of the inner surface of the first finding surface 41 of the lower frame 4, the second finding surface 82 abuts against the lower part of the inner surface of the second finding surface 42 of the lower frame 4, the lower end of the first finding surface 81 abuts against the outdoor-side corner of the inner surface of the lower frame 4, and the lower end of the second finding surface 82 abuts against the indoor-side corner of the inner surface of the lower frame 4. The length dimension of the lower reinforcing frame 8 according to the present embodiment is the same as the length dimension of the lower frame 4. In the present embodiment, the plate material forming the lower reinforcing frame 8 is thinner than the plate material forming the lower frame 4, but it is not limited thereto. In one aspect, the lower reinforcing frame 8 is located inside the lower frame 4 and is fixed to the lower frame 4 by welding or screws.

[0033] The lower end surface 23 of the door body 2 according to this embodiment is formed by an outdoor side portion 230 of a first surface material that abuts against an outdoor side portion of the lower surface portion 40 of the lower frame 4, an indoor side portion 231 of a second surface material that abuts against an indoor side portion of the lower surface portion 40 of the lower frame 4, and an exposed surface 40' of the lower surface portion 40 of the lower frame 4 that is located between the outdoor side portion 230 and the indoor side portion 231 of the lower end surface 23. A plurality of first lower side holes 400 are formed at intervals across the width direction of the door body 2 on the exposed surface 40' of the lower surface portion 40 of the lower frame 4 that forms the lower end surface of the door body 2. In this embodiment, a narrow exposed surface 40' extending in the width direction of the door body 2 is formed, and the first lower side holes 400 are formed on this exposed surface 40'. However, a notch may be partially formed in the outdoor side portion 230 of the first surface material or the indoor side portion 231 of the second surface material, and the first lower side holes 400 may be formed corresponding to the notch. In this embodiment, the first lower side holes 400 are provided at the central portion in the expected direction (thickness direction) of the door body 2. However, by forming the first lower side holes 400 closer to the first finding surface 20 side, the efficiency of intake air from the external space may be improved.

[0034] The surface portion 80 of the lower side reinforcing frame 8 is located above the lower surface portion 40 of the lower frame 4, extends horizontally in parallel with the lower surface portion 40, and partitions the lower portion of the internal space. A plurality of second lower side holes 800 are formed at intervals across the width direction of the door body 2 on the surface portion 80. In this embodiment, the total area of the plurality of first lower side holes 400 and the total area of the plurality of second lower side holes 800 are substantially the same.

[0035] A plurality of first lower holes 400 formed on the exposed surface 40' of the lower surface portion 40 of the lower frame 4 forming the lower end surface of the door body 2 and a plurality of second lower holes 800 formed on the surface portion 80 of the lower reinforcing frame 8 are displaced in the width direction of the door body 2 and are not in communication in the height direction of the door body 2. The air sucked in from the first lower holes 400 is sucked into the internal space from the second lower holes 800 through the space between the lower surface portion 40 of the lower frame 4 and the surface portion 80 of the lower reinforcing frame 8. Even if a flame generated in the lower part of the internal space tries to flare out downward from the second lower holes 800, it hits the lower surface portion 40 of the lower frame 4, and the direct flaring out of the flame from the first lower holes 400 is suppressed as much as possible.

[0036] The upper frame 10 includes an outdoor-facing surface 100, an indoor-facing surface 101, and a lower surface portion facing the opening and extending in the opening width direction. The lower surface portion is formed by an outdoor lower surface portion 102 located on the outdoor side and an indoor lower surface portion 103 located on the indoor side. The outdoor lower surface portion 102 is at a higher position than the indoor lower surface portion 103, and the rear end (indoor end) of the outdoor lower surface portion 102 and the front end (outdoor end) of the indoor lower surface portion 103 are stepped and are connected via a concave groove 104. The concave groove 104 opens toward the outdoor side, and an airtight material 9 is inserted into the concave groove 104, and the upper end portion of the second finding surface 21 of the door body 2 in the fully closed position is in close contact with the airtight material 9.

[0037] The lower frame 11 includes an outdoor-facing surface 110, an indoor-facing surface 111, and an upper surface portion facing the opening and extending in the opening width direction. The upper surface portion is formed by an outdoor upper surface portion 112 located on the outdoor side and an indoor upper surface portion 113 located on the indoor side. The indoor upper surface portion 113 is at a higher position than the outdoor upper surface portion 112, and the rear end (indoor end) of the outdoor upper surface portion 112 and the front end (outdoor end) of the indoor upper surface portion 113 are stepped and are connected via a concave groove 114. The concave groove 114 opens toward the outdoor side, and an airtight material 9 is inserted into the concave groove 114, and the lower end portion of the second finding surface 21 of the door body 2 in the fully closed position is in close contact with the airtight material 9.

[0038] The leading-side vertical frame 12 has an outdoor-facing surface 120, an indoor-facing surface 121, and a prospective surface facing the building opening. The prospective surface is formed by an outdoor prospective surface 122 located on the outdoor side and an indoor prospective surface 123 located on the indoor side. The indoor prospective surface 123 is located inside (in the opening width direction) with respect to the outdoor prospective surface 122, and the rear end (indoor-side end) of the outdoor prospective surface 122 and the front end (outdoor-side end) of the indoor prospective surface 123 are connected via a stepped concave groove 124. An airtight material 9 is inserted into the concave groove 124, and the leading-side end of the second finding surface 21 of the door body 2 in the fully closed position is adapted to be in close contact with the airtight material 9.

[0039] The trailing-side vertical frame 13 has an outdoor-facing surface 130, an indoor-facing surface 131, and a prospective surface facing the building opening. The prospective surface is formed by an outdoor prospective surface 132 located on the outdoor side and an indoor prospective surface 133 located on the indoor side. The indoor prospective surface 133 is located inside (in the opening width direction) with respect to the outdoor prospective surface 132, and the rear end (indoor-side end) of the outdoor prospective surface 132 and the front end (outdoor-side end) of the indoor prospective surface 133 are connected via a stepped concave groove 134. An airtight material 9 is inserted into the concave groove 134, and the leading-side end of the second finding surface 21 of the door body 2 in the fully closed position is adapted to be in close contact with the airtight material 9.

[0040] In the fully closed position of the opening of the door device configured as described above, the upper end surface 22 of the door body 2 faces the outdoor lower surface portion 102 of the upper frame 10 with a gap therebetween, the lower end surface 23 faces the outdoor upper surface portion 112 of the lower frame 11 with a gap therebetween, the leading-side end surface 24 faces the outdoor prospective surface 122 of the leading-side vertical frame 12 with a gap therebetween, the trailing-side end surface 25 faces the outdoor prospective surface 132 of the trailing-side vertical frame 13 with a gap therebetween, and the periphery of the second finding surface 21 is in close contact with the airtight material 9 provided in a four-sided shape.

[0041] When a fire breaks out in either the outdoor space or the indoor space when the door device is in the fully closed position of the opening, the door body 2 is exposed to high temperatures, and the air in the internal space of the door body 2 is heated and rises. However, the internal space of the door body 2 communicates with the external space through the first lower holes 400 and the second lower holes 800 at the lower end, and also communicates with the external space through the first holes 300 and the second holes 700 at the upper end. By inhaling air from the first lower holes 400 and exhausting it from the first holes 300, an upward airflow is generated within the internal space of the door body 2.

[0042] When the door body 2 is exposed to high temperatures, the adhesive that bonds the core material C and the back surface of the surface material may melt and further vaporize to generate combustible gas. However, the generated combustible gas is discharged from the upper end surface 22 of the door body 2 by the upward airflow, so the combustible gas is prevented from accumulating in the internal space of the door body 2, and the accumulated combustible gas is further heated and ignited as much as possible.

[0043] Also, even if combustible gas ignites in the internal space of the door body 2, in the upper part of the door body 2, the plurality of first holes 300 and the plurality of second holes 700 are offset in the width direction of the door body 2, forming a so-called crank-shaped flow path. When combustible gas ignites in the upper part of the internal space, the flame is as much as possible prevented from emerging from the upper end surface 22 of the door body 2. In the lower part of the door body 2, the plurality of first lower holes 400 and the plurality of second lower holes 800 are offset in the width direction of the door body 2, forming a so-called crank-shaped flow path. When combustible gas ignites in the lower part of the internal space, the flame is as much as possible prevented from emerging from the lower end surface 23 of the door body 2.

[0044] As shown in FIG. 3, when the outdoor space is the fire side and the indoor space is the non-fire side, the first finding surface 20 of the door body 2 is exposed to the high temperature of the fire, and the gas in the internal space (including air and combustible gas vaporized from the adhesive) is discharged from the first holes 300 at the upper end through the gap between the upper end surface 22 of the door body 2 and the lower surface portion 102 on the outdoor side of the upper frame 10 to the outdoor space (fire side). Although the combustible gas discharged to the outdoor space (fire side) may ignite, this does not have an adverse impact on fire prevention in the indoor space (non-fire side).

[0045] As shown in FIG. 4, when the indoor side space is the fire side and the outdoor side space is the non-fire side, the second contact surface 21 of the door body 2 is exposed to the high temperature of the fire, and the gas in the internal space (including combustible gas vaporized from the adhesive in addition to air) is discharged from the first hole 300 at the upper end to the outdoor side space (non-fire side) through the gap between the upper end surface of the door body 2 and the lower outdoor surface portion 102 of the upper frame 10. Although the combustible gas is discharged to the outdoor side space (non-fire side), since the temperature of the outdoor side space (non-fire side) is lower than that of the fire side, the combustible gas will not ignite and will not have an adverse fire protection impact on the outdoor side space (non-fire side).

[0046] In any of the cases shown in FIGS. 3 and 4, in the upper part of the door body 2, since the plurality of first holes 300 and the plurality of second holes 700 form a crank-shaped flow path, even if the combustible gas vaporized from the adhesive catches fire in the internal space, the flame is suppressed as much as possible from emerging from the upper end surface of the door body 2 and does not emerge on the non-fire side.

[0047] FIG. 9 shows a door body 2' according to another embodiment. A concealed glass window portion G is provided in the upper half part of the door body 2. In the door body 2', for the configuration other than the glass window portion G, it is substantially the same as the configuration of the door body 2, and the description of the door body 2 can be incorporated by reference. It is optional to provide a fire protection structure for the glass window portion G.

[0048] FIG. 10 shows an upper reinforcement frame 7' according to another embodiment. The upper reinforcement frame 7' is a partition plate that reinforces the upper part of the door body 2 and partitions the upper part of the internal space of the door body 2. The upper reinforcement frame 7' is a long member extending in the width direction of the door body 2, and includes a face portion 70', a first contact surface 71' vertically rising from the outdoor side end of the face portion 70', and a second contact surface 72' vertically rising from the indoor side end of the face portion 70', and has a U-shaped cross-sectional view. The first hole 300 formed in the upper surface portion 30 of the upper frame 3 and the second hole 700' formed in the face portion 70' of the upper reinforcement frame 7' are offset in the width direction of the door body 2.

[0049] The expected dimensions of the face portion 70' of the upper reinforcing frame 7' are the same as the expected dimensions of the upper face portion 30 of the upper frame 3. The first finding surface 71' of the upper reinforcing frame 7' is flush with the first finding surface 31 of the upper frame 3 and abuts against the back surface of the upper portion of the face portion of the first surface material. The second finding surface 72' of the upper reinforcing frame 7' is flush with the second finding surface 32 of the upper frame 3 and abuts against the back surface of the upper portion of the face portion of the second surface material. The upper end of the first finding surface 71' abuts against the lower end of the first finding surface 31 of the upper frame 3, and the upper end of the second finding surface 72' abuts against the lower end of the second finding surface 32 of the upper frame 3. The length dimension of the upper reinforcing frame 7' according to the present embodiment is the same as the length dimension of the upper frame 3. In the present embodiment, the plate thickness of the plate material forming the upper reinforcing frame 7' is the same as the plate thickness of the plate material forming the upper frame 3, but it is not limited thereto.

[0050] The upper diagram of FIG. 11 shows another embodiment of the first hole and the second hole that are offset so as not to communicate in the height direction of the door body 2. In the upper diagram, on the upper end surface 30'' of the door body, a first hole 300A is formed so as to be biased toward the first side in the thickness direction (expected direction) of the door body, and on the partition plate below the upper end surface 30'', a second hole 700A is formed so as to be biased toward the second side in the thickness direction (expected direction) of the door body. In the upper diagram, the first hole 300A and the second hole 700A are offset in the thickness direction and the width direction of the door body and are spaced apart in the diagonal direction in plan view.

[0051] In the central diagram, on the upper end surface 30'' of the door body, the first holes 300A are formed so as to be alternately biased toward the first side and the second side in the thickness direction (expected direction) of the door body, and on the partition plate below the upper end surface 30'', the second holes 700A are formed so as to be alternately biased toward the second side and the first side in the thickness direction of the door body. The first holes 300A and the second holes 700A are offset in the thickness direction (expected direction) of the door body.

[0052] In the following figure, a first hole 300A is formed on the upper end surface 30'' of the door body, biased toward the second side in the thickness direction (expected direction) of the door body. On the partition plate below the upper end surface 30'', a second hole 700A is formed, biased toward the first side in the thickness direction (expected direction) of the door body. The first hole 300A and the second hole 700A are offset in the thickness direction (expected direction) of the door body.

Explanation of Signs

[0053] 1 Door frame 2 Door body (steel door) 20 First finding surface 21 Second finding surface 22 Upper end surface 220 Outdoor side part (upper end surface) 221 Indoor side part (upper end surface) 23 Lower end surface 230 Outdoor side part (lower end surface) 231 Indoor side part (lower end surface) 3 Upper frame (first upper frame) 30 Upper surface part 30' Exposed surface (upper end surface) 300 First hole (first upper side hole) 4 Lower frame 40 Lower surface part 40' Exposed surface (lower end surface) 400 First lower side hole 7 Upper side reinforcement frame (upper side partition plate, second upper frame) 700 Second hole (second upper side hole) 8 Lower side reinforcement frame (lower side partition plate) 800 Second lower side hole C Core material

Claims

1. A steel door having a combustible gasification element inside, wherein one or more first holes are formed on the upper end face, at the upper end part of the internal space, a partition plate is provided below the upper end face, one or more second holes are formed on the partition plate, the first holes and the second holes are offset so as not to communicate in the height direction of the door, a steel door.

2. A steel door having a combustible gasification element inside, wherein one or more first holes are formed on the upper end face, at the upper end part of the internal space, a partition plate is provided below the upper end face, one or more second holes are formed on the partition plate, a plurality of first holes are formed on the upper end face with an interval in the width direction of the door, a plurality of second holes are formed on the partition plate with an interval in the width direction of the door, the plurality of first holes and the plurality of second holes are offset so as not to communicate in the height direction of the door, a steel door.

3. A steel door having a combustible gasification element inside, wherein one or more first holes are formed on the upper end face, at the upper end part of the internal space, a partition plate is provided below the upper end face, one or more second holes are formed on the partition plate, the first holes and the second holes are offset in the width direction of the door, a steel door.

4. The first holes are formed on the upper frame of the steel door, The steel door according to any one of Claims 1 to 3.

5. At the upper end part of the door, an upper first upper frame and a lower second upper frame are provided, the first holes are formed on the first upper frame, the second upper frame forms the partition plate, the second holes are formed on the second upper frame, The steel door according to any one of Claims 1 to 4.

6. A steel door having a combustible gasification element inside, wherein one or more first holes are formed on the upper end face, at the upper end part of the internal space, a partition plate is provided below the upper end face, one or more second holes are formed on the partition plate, one or more holes are formed on the lower end face, at the lower part of the internal space, a lower partition plate is provided above the lower end face, one or more holes are formed on the lower partition plate, the holes formed on the lower end face and the holes formed on the lower partition plate are offset so as not to communicate in the height direction of the door, a steel door.

7. A steel door having a combustible gasification element inside, one or more first holes are formed in the upper end face, at the upper end part of the internal space, a partition plate is provided below the upper end face, one or more second holes are formed in the partition plate, one or more holes are formed in the lower end face, at the lower part of the internal space, a lower partition plate is provided above the lower end face, one or more holes are formed in the lower partition plate, the holes formed in the lower end face and the holes formed in the lower partition plate are offset in the width direction of the door, Steel door.

8. A steel door having a combustible gasification element inside, the upper frame of the steel door has a U-shaped cross section including an upper surface portion, a first finding surface hanging down from the outdoor side end of the upper surface portion, and a second finding surface hanging down from the indoor side end of the upper surface portion, and the portion of the upper surface portion forms the upper end face of the steel door, one or more first holes are formed in the upper end face, inside the upper frame, a partition plate having a surface facing the lower part of the upper surface portion of the upper frame at a distance is fixed, the surface of the partition plate is located below the upper end face at the upper end part of the internal space, one or more second holes are formed in the surface of the partition plate, Steel door.

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