TW201812163A - Anti-disaster door structure - Google Patents

Abstract

Provided is an easy-to-operate anti-disaster door structure having resistance to water, fire, and earth pressure related to tsunamis, tsunami-caused disasters, and landslides, etc. An outer door and an inner door, which form a two-layer door, are pivotably affixed to door frame, fire-resistant packing is provided in ring form along the outer circumference of the rear faces of the outer door and the inner door, and water-resistant packing is provided in parallel on the inside. Insulation material is attached to the entire inner surface of the water-tight packing. The water-tight packing and the fire-resistant packing are contained in a retaining member. A first lock device or a second lock device for affixing the outer door and the door frame are provided. The outer door, the inner door, and the door frame are preferably steel.

Description

   Disaster door structure   

The invention relates to a disaster prevention door structure, which can respond to tsunami, fire and earth and rock disasters.

In order to prepare in advance for the "South China Sea Trench Earthquake" which is expected to occur in the near future, the task that must be faced is to develop a disaster door structure used as a shelter for earthquakes and tsunami response measures. According to the contents published by the Cabinet in 2013, the number of deaths caused by the tsunami of the huge earthquake in the South China Sea Trench has increased by 13 times compared with the number predicted in the 2003 Central Disaster Prevention Conference. Among them, those who died in the tsunami accounted for 70% of the whole. In addition, earth and rock disasters caused by concentrated heavy rain every year invade earth and rocks from windows or doors that are weaker than buildings, and kill precious lives. Therefore, people hope to develop disaster prevention door structures that can cope with various disasters.

Inventions such as Patent Documents 1 to 3 currently have various inventions related to the structure of disaster prevention doors.

The frontal disaster prevention frame of the invention disclosed in Patent Document 1 is deformed or cracked due to abnormal compression force during an earthquake, and the frame supporting a door installed on the front of the building is deformed, causing a door, etc. It is difficult to open or close, or the frame is distorted due to overheating during a fire, which makes it impossible to open the door, etc. In order to avoid the above situation and ensure safety, several reinforcing materials are used as truss structures.

Patent Document 2 discloses a door crimping tool of the invention and a door provided with the same. The structure of the aforementioned door crimping tool is simple, and the manufacturing cost and installation cost are low. The soundproofness, smokeproofness and New waterproof door crimping tool and door provided with the same. Specifically, the door crimping tool is composed of an abutment bar and a joint portion provided by any one of the abutment protrusion or the approach channel. For the door panel and the door frame in the door, any one of the abutment bar and the aforesaid portion is provided. In one, the abutment lever is rotated, and the abutment protrusion is guided along the approach path to the fitting point, so that the door panel is crimped toward the door frame.

Patent Document 3 discloses that the structure of the invention is such that, in order to exhibit disaster prevention performance such as fire prevention performance and sound insulation performance, the disaster prevention door capable of locking the opening of the structure and the disaster prevention door locking device for locking the disaster prevention door can be used by the user. You can also lock the disaster-prevention door in a high air-tight state by operating a lever. Specifically, when the door body is returned to the locking direction, the stick is released from the maintenance state by the trigger device, and at the same time is moved upward by the latch lock. In this way, the distal end portion of the rod is guided to the inner sharp surface and the abutting surface of the holder by the urging force of the compression coil spring, and is inserted. At this time, the door body, which is pivoted around the hinge, locks the opening while crimping the sealing material to achieve disaster prevention performance and sound insulation performance such as the fire performance required for disaster prevention.

    Prior technical literature:    

Patent Document 1: JP 2013-163962

Patent Document 2: Japanese Patent Application Laid-Open No. 2009-114650

Patent Document 3: Japanese Patent Application Laid-Open No. 2008-303689

However, the conventional techniques disclosed in Patent Documents 1 to 3 have the following problems.

(1) Although the structure for increasing the strength of the door frame is disclosed, no mention is made of enhancing the strength of the overall structure of the door including the door.

(2) The structure used to lock the door in a high airtight state is quite complicated, and the installation cost is high. In addition, the premise is to install a standardized product that is mass-produced in a factory, and therefore, it may be difficult to install it on an existing structure.

(3) The structure for locking and fixing the door is quite complicated, the installation cost is high, and sometimes it is difficult to install it on an existing structure.

(4) The above structure is quite complicated and requires high technology during construction, so the cost is high and the construction period is long, and it has not been popularized to ordinary households.

In order to ensure the necessary safety when a disaster occurs, the disaster prevention door structure must have all of the following properties: water resistance to tsunami wave forces, fire resistance to tsunami fires, and earth pressure resistance to earth and rock disasters. With the increasing awareness of disaster prevention, the demand for the door structure of individual homes is also increasing. In view of the disasters that have occurred frequently in recent years, the above-mentioned needs are also considerable in families with elderly, young children, and people with physical disabilities at home.

The subject of the present invention is to provide a simple disaster-prevention door structure for tsunami, tsunami fire, earth-rock flow disaster, etc., which can ensure water resistance, fire resistance and earth pressure resistance performance, and is easy to operate.

In order to solve the above-mentioned problems, the invention of the first scope of the patent application is a disaster prevention door structure (hereinafter referred to as the door structure), which is characterized by including a door having a surface and an inner surface, a door frame that forms an opening and closes the door, and follows the door frame. The outer periphery of the OR door is provided with a ring-shaped fire-resistant gasket, and a water-tight gasket provided on the fire-resistant gasket, and a maintenance member for accommodating the fire-resistant gasket and the water-tight gasket.

If this structure is adopted, the door is structured to be provided with a ring-shaped watertight gasket outside along the outer periphery of the door frame or the inner surface of the door, and a fireproof gasket is provided, so the watertight gasket can be protected from a fire caused by a tsunami fire. heat. In addition, even when the sanctuary is soaked in water by a tsunami, the seawater can be prevented from entering the door through the waterproof pad. In addition, since the refractory gasket and the watertight gasket are housed in the maintenance member, the fireproof performance and the watertight performance can be maintained for a long time.

The second invention is characterized in that in the main door structure described in the first invention, the refractory gasket is a material that expands when heat is transmitted.

With this structure, the refractory gasket is a material that expands when heat is transmitted. Therefore, the refractory gasket swells due to fire heat and seals the gap generated between the door and the door frame. As a result, flames and toxic gases can be prevented from entering the shelter.

The third invention is characterized in that, in the door structure of the invention described in the first or second invention, at least one refractory gasket is provided, and several watertight gaskets are provided.

If this structure is adopted, there are several watertight gaskets, which have stronger watertight performance than the door structure.

The fourth invention is characterized in that, according to any one of the first to third aspects of the present door structure, the first lock device further includes a fixed door and a door frame. The first lock device includes: The first nut on which the first bolt is screwed on the surface is inserted in the first bolt, the spring material held by the door and the first nut, and a washer that is slightly rectangular when viewed from the front, and is provided at the opening of the door frame The first protruding portion through the through hole, when the door is closed in the door frame, the washer can be rotated in a state where the first bolt and the spring material penetrate the through hole.

With this structure, the washer inserted through the first bolt is formed in a state capable of reversing and fixing to the door by a spring material. When the door is closed to the door frame, the gasket penetrates the through hole and is located inside the first protruding portion. When the washer is rotated by a predetermined angle (for example, 90 degrees), the washer and the first protruding portion overlap when viewed from the front. In this state, when the first bolt is tightened, movement of the washer in the direction of the door is restricted by the first protrusion, and the first protrusion is pressed. As a result, the door can be easily locked.

The fifth invention is characterized in that, in the present door structure described in any one of the first to the third, a second lock device for fixing the door and the door frame is further provided, and the second lock device is provided at the opening of the door frame. The second protruding portion provided on the side has a swingable and fixed rocker rod, a second bolt screwed with a female screw formed on the rocker rod, and a second nut fixed on the door to close the door to the door frame. In this case, the second bolt can be screwed to the second nut.

If this structure is adopted, the second locking device is a second protrusion provided on the side of the opening of the door frame, and has a swing bar that can be fixed and fixed, and is screwed with a female screw formed on the swing bar. The second bolt is fixed to the rocker and the second nut is fixed to the door. When the door is closed to the door frame, the second bolt can be screwed to the second nut, so the door can be easily locked. For example, first prepare an electric wrench in the shelter, and then lock the second bolt with the electric wrench to easily lock the door.

The sixth invention is characterized in that, in the main door structure described in any one of the first to the fifth inventions, there is an inner door which is disposed to face through the door frame.

If this structure is adopted, the door is constructed as a double door with a door and an inner door. The door and the inner door are oppositely disposed through the door frame. Therefore, compared with a door, the water resistance, fire resistance and earth pressure resistance are improved.

The seventh invention is characterized in that, in the present door structure described in the sixth invention, the inner surfaces of the door and the inner door are adhered with a heat-insulating material having fire resistance.

With this structure, the door and the inner surface of the door are adhered with a heat-insulating material having a fire resistance performance, so the heat insulation performance can be improved, and the temperature rise in the interior space can be suppressed against the high temperature caused by a fire.

1.201‧‧‧door structure

3.203‧‧‧Door Frame

3a‧‧‧ Reinforcing board

4,204‧‧‧outdoor

4a, b, c, d‧‧‧ ring retaining material

5,205‧‧‧Inner door

5a, b‧‧‧ watertight liner

6‧‧‧ Refractory gasket

7‧‧‧The first locking device

8‧‧‧Insulation

9‧‧‧ fixed rod

10‧‧‧ opening

31, 32, 33, 34‧‧‧ frame

70‧‧‧ protruding material (first protruding part)

71‧‧‧The first bolt

72‧‧‧The first nut

75‧‧‧through hole

76‧‧‧washer

77‧‧‧Spring

91‧‧‧ stick body

92‧‧‧wall push plate

93‧‧‧ jack

94‧‧‧door push plate

207‧‧‧Second locking device

270‧‧‧ protruding material (second protruding part)

271‧‧‧Second bolt

272‧‧‧Second nut

273‧‧‧ rocker

274‧‧‧shaft body bolt

275‧‧‧ pedestal

276‧‧‧rocker stopper

35, 37‧‧‧ flange (1st protrusion)

235, 237‧‧‧ flange (2nd protrusion)

FIG. 1 is a schematic perspective view of a main door structure according to Embodiment 1. FIG.

[Fig. 2] (a) A sectional view of an outer door of an implementation type, and (b) A partial inner view of the same door.

[Fig. 3] (a) is a sectional view of a refractory gasket and a watertight gasket of embodiment 1, (b) is a sectional view showing a fixed state of a door frame and an outer door of the same gasket, and (c) is a same gasket Sectional view of the expanded state.

[Fig. 4] (a) is a perspective view showing a state where the door frame of the embodiment 1 is provided with a protruding portion, and (b) is a front view of the same reinforcing plate.

[Fig. 5] (a) is a side sectional view of the first locking device, and (b) is a front view from the same inner door side.

[Fig. 6] is a part view of the fixing rod.

Fig. 7 is a front view of the inner door side of the second locking device in the second embodiment.

[Fig. 8] A plan view of the same section.

[FIG. 9] A front view showing the inner door side in a state where the outer door and the door frame are fixed by the second locking device in the embodiment 2. [FIG.

[Fig. 10] A plan view of the same section.

[Fig. 11] (a) is a partial cross-sectional view when a grooved steel is used for a door frame in Embodiments 1 and 2, and (b) is a partial cross-sectional view when an H-shaped steel is used.

Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 6. The main door structure 1 of the implementation form 1 includes: an outer door 4, an inner door 5, a door frame 3 that closes the outer door 4 and the inner door 5, and a refractory gasket 6 having a rectangular shape along the outer periphery of the outer surface of the outer door 4. And watertight pads 5a and b provided inside the refractory pad 6; annular retaining members 4a, b, c, and d (maintaining members) for accommodating the refractory pad 6 and the watertight pads 5a, 5b; and a first locking device 7.

As shown in FIGS. 1 and 4, the door frame 3 is a structure in which the frame materials 31, 32, 33, and 34 are combined into a square shape to form the opening 10, and at the same time, the shape of the outer edge is rectangular. The outer door 4 is fixed on the outer surface (hereinafter referred to as the outer side) of the frame body 32 in a reversible manner, and the inner door 5 is fixed on the inner surface (hereinafter referred to as the inner side) in a reversible manner. Here, the outer side refers to a side opposed to the external space during installation, and the inner side refers to a side opposed to the internal space during installation. In addition, the protruding material 70 (the first protruding portion) is protruded outside the center portion of the inner edge of the frame material 31. A through hole 75 is formed in the protruding material 70.

The frame materials 31, 32, 33, and 34 are preferably square cylinders and angle steel pipes (exemplified as JIS G 3466 75 mm × 75 mm.). In addition, a mouth-shaped reinforcing plate 3a having the same shape as the frame surface may be welded and fixed on the outer and inner surfaces. The reinforcing plate 3a is exemplified as an iron plate having a thickness of 9 mm. In this way, even if a huge earthquake strikes, it can have sufficient strength. In addition, in this embodiment, although the protruding material 70 is provided in the frame material 31, it may be provided in the reinforcing plate 3a attached to the outer side surface.

The outer door 4 is fixed to the outer side surface of the frame member 32 in a rotatable manner. The material of the outer door 4 is an iron plate, and the thickness is preferably 6 to 12 mm. In this embodiment, the thickness is exemplified as 9 mm. The door frame 3 and the outer door are made of steel, which can improve the earth pressure resistance of the door structure 1.

As shown in FIG. 2, a substantially rectangular refractory gasket 6 is provided on the outer peripheral portion of the inner surface of the outer door 4. In addition, two watertight gaskets 5a, b are provided inside the refractory gasket 6. A door handle (not shown) is provided on the surface. Here, the inner surface of the outer door 4 refers to a facade facing the outer side surface of the door frame 3, and the surface refers to the other side facade not facing the outer side surface of the door frame 3.

The ring-shaped retaining members 4a, b, c, and d are protruded in a state where the inner surface of the outer door 4 is connected in the circumferential direction. The refractory gasket 6 and the watertight gasket 5a, b are housed in three recessed portions formed by the ring-shaped retaining members 4a, b, c, d and the inner surface of the outer door 4, respectively.

The refractory pad 6 is a structure in which a fiber sheet having a fire resistance property is rolled up, and the fiber sheet is rolled up, and is configured to expand when the temperature rises. The fiber sheet exemplified here is a Tyvek (registered trademark) silver sheet from DuPont. Aramid fiber, fluorine-containing fiber, carbon fiber, polytetrafluoroethylene (PTFE) fiber, polyimide fiber, and polyarylate The fiber and polyphenylene sulfide (PPS) fiber are woven into a sheet, and aluminum is vapor-deposited on the woven fiber, and a resin is coated thereon to prevent deterioration.

The operation of the refractory gasket 6 and the watertight gaskets 5a and b when the temperature rises due to the heat of the flame will be described below with reference to FIG. 3.

As shown in FIG. 3 (a), the watertight gaskets 5a and 5b are provided on the inner surface of the outer door 4 in a state where the upper ends of the fireproof gasket 6 and the ring-shaped retaining members 4a, b, c, and d protrude higher.

As shown in FIG. 3 (b), in a state where the outer door 4 and the door frame 3 are fixed, the watertight pads 5a, b are in close contact with the outside of the door frame 3. In this way, the gap between the outer door 4 and the door frame 3 is double-sealed, and the water pressure can be withstood even if a tsunami strikes or soaks in water.

As shown in FIG. 3 (c), when heat is transmitted from the flame, the temperature of the refractory pad 6 rises, and the refractory pad 6 expands. At this time, the height of the refractory gasket 6 is higher than that of the ring-shaped retaining members 4c and d. The refractory gasket 6 and the watertight gaskets 5a and b cooperate with each other to seal the gap between the outer door 4 and the door frame 3. In addition, the watertight pads 5a, b are protected from high heat caused by flames. In this way, even if a tsunami or tsunami fire occurs, flame intrusion can be prevented and watertightness can be ensured.

The inner area of the ring-shaped retaining member 4a protruding from the inner surface of the outer door 4 is entirely covered with a heat insulating material 8. The heat insulation material 8 is preferably a glass wool board, which can improve the adhesion of the door frame 3 and the outer door 4 when the outer door 4 is closed, and improve the heat insulation performance.

The inner door 5 is fixed in a state where the inner surface of the frame member 32 can be turned back. In addition, similar to the outer door 4, the refractory gasket 6, watertight gaskets 5a, and b are provided on the inner surface of the inner door 5, and are housed in the ring-shaped retaining members 4a, b, c, and d. The inner area of the ring-shaped holding member 4a is entirely covered with a heat insulating material 8. Since the structure is almost the same as that of the outer door 4, the description is omitted. Here, the inner surface of the inner door 5 refers to a facade facing the inner side surface of the door frame 3, and the surface refers to a facade on the other side not facing the inner side surface of the door frame 3.

As shown in FIG. 5, a first lock device 7 for fixing the door frame 3 and the outer door 4 is provided. The first lock device 7 includes a first bolt 71, a first nut 72, a washer 76, a spring material 77, and the like. The head of the first bolt 71 is welded to the inner surface of the outer door 4 and fixed.

The spring member 77 is provided with a spring function. The washer 76 is pushed by its expansion and contraction force, is inserted through the first bolt 71, and is disposed on the inner surface of the outer door 4. The washer 76 is inserted through the first bolt 71 and is stacked on the spring material 77. The spring member 77 and the washer 76 are held by the first nut 72 and the outer door 4 that are screwed with the first bolt 71 in a state where a certain compression force is given by the spring member 77. That is, the washer 76 is fixed to the outer door 4 in a state capable of returning via the spring material 77.

The protruding material 70 has a through hole that is slightly larger than the outer edge of the washer 76 and has a rectangular shape. The through hole 75 penetrates the washer 76 while closing the outer door 4, and at the same time, the washer is returned to a fixed angle (for example, 90 degrees) to limit the movement of the washer 76 in the direction of the outer door 4. Therefore, the length of the long side of the washer 76 is set to be longer than the length of the short side of the through hole 75. In addition, the gasket 76 is disposed inside the through hole 75 when viewed from the front when the outer door 4 is closed.

When the outer door 4 is closed, the washer 76 penetrating the through-hole 75 is turned back in the V direction at a fixed angle to form a state overlapping with the protruding material 70 when viewed from the front. That is, the first nut 72 can be locked without removing the through-hole 75. After that, the outer door 4 can be fixed to the door frame 3 by locking the first nut 72. In this way, the fire-resistant gasket and the water-tight gasket 5a, b cooperate to improve the water-tight performance and the fire-resistant performance. When tightening the nut, it is better to use a pre-equipped electric wrench. With power tools, locking can be done easily without much effort.

The inner door 5 is usually used in an open state, but when the inner door 5 is closed and fixed, it is better to use a fixing rod 9 that supports the inner door 5. As shown in FIG. 6, the fixed rod 9 is structured such that at one end portion of the rod body portion 91 having both ends, the fixed wall pressing plate 92 is fixed, and the other end portion is fixed by the jack 93 and the fixed door pressing plate. 94.

A wall pressing plate 92 is provided on the wall surface facing the inner door 5. A door pressing plate 94 is provided on the surface of the inner door 5, and a jack 93 is operated to press the wall surface and the surface of the inner door 5. In this way, the inner door 5 can be fixed to the door frame 3.

Usually, it is first installed in a fixed place in the house. When in use, the inner door 5 is supported from the indoor side with the inner door closed. The fixing rod 9 is mounted on the ceiling lifting unit, and can be used after being lowered to the bottom when evacuating.

When the inner door 5 is fixed in a closed state, the inner door 5 is pushed by the fixing rod 9, so a door that does not require unnecessary items such as a doorknob is preferred.

Hereinafter, the present door structure 201 according to the second embodiment will be described with reference to FIGS. 7 to 10. The implementation form 2 is basically the same as the implementation form 1, starting with the part number 200, and referring to the illustrations and explanations, mainly explaining the differences.

This door structure 201 includes the same door frame, outer door, and inner door as in Embodiment 1. The door frame has a protruding material 270 (second protruding portion) similar to that of the first embodiment, and is protruded from the door frame. In addition, the inner surfaces of the outer door and the inner door are provided with a fire-resistant gasket, a watertight gasket, a ring-shaped retaining member, and a heat-insulating member in the same manner as in Embodiment 1.

The second locking device 207 includes a protruding material 270, a stand 275, a shaft bolt 274, a rocker 273, a second bolt 271, and a second nut 272.

On the inner surface of the protruding material 270 (the other surface that is not opposed to the outer door 204), a base 275 for forming a female screw is provided. A shaft bolt 274 for supporting the rocker 273 is screwed onto the base 275. A rocker stopper 276 is provided on the upper end of the pedestal 275 to restrict the return of the rocker 273.

A female screw is formed on the end of the rocker 273 and is screwed with the second bolt 271. A second nut 272 is fixed to the inner surface of the outer door 204, and the second nut is screwable with the second bolt.

As shown in FIG. 7, when the outer door 204 and the door frame 203 are not fixed by the second locking device 207, the rocker 273 pivotally supported by the shaft bolt 274 is in a suspended state.

When an earthquake occurs and a tsunami or tsunami fire is predicted, enter the evacuation space quickly and close the outer door 204 and door frame 203 tightly.

The sequence of the tight outer door 204 and the door frame 203 will be described below. The rocker 273 is turned back so that the second bolt 271 is positioned directly above the second nut 272 when viewed from a plane. Insert the tip of the second bolt 271 into the hole formed by the female screw of the second nut 272. The second bolt 271 is turned back to screw into the second nut 272. As a result, the outer door 204 and the door frame 203 are fixed. In the screwing industry, it is better to use a prepared electric wrench. With power tools, it is easy to carry out screwing operations without much effort. The position of the second bolt 271 at the time of stopping the return movement by the rocker stopper 276 is preferably set to be located directly above the second bolt 272. This makes it easier to screw on the second nut.

The fixing of the inner door 205 and the door frame 203 is the same as the first embodiment.

The above-mentioned embodiment is exemplified as an ideal embodiment for implementing the present invention. The present invention is not limited to the above-mentioned embodiments, as long as it is within the scope of the invention, even if it is changed, it still belongs to the technical scope of the present invention.

For example, although the door frames 3 and 203 have a square-shaped structure made of angle steel pipes, as shown in FIG. 11 (a), a grooved steel can be used as a frame material, and a recessed portion of the grooved steel can be formed to face the opening In the state of 10 and 210, it forms a square structure. As shown in FIG. 11 (b), an H-shaped steel material may be used as the frame material. In addition, the above structures may be used in combination to form a square. The first protrusions and the second protrusions at this time are preferably the flanges 35, 37, 235, and 237 located on the outer door 4,204 side.

In the example described here, this door structure 1, 201 is applicable to a swing door, but it is also applicable to a sliding door, and it goes without saying.

The present invention can provide a safe and secure disaster prevention door structure that can cope with tsunamis, fires, tornadoes, and earth and rock disasters. Especially in the coastal areas, the industrial use value is considerable.

Claims (7)

    A disaster-prevention door structure, comprising: a door having a surface and an inner surface; a door frame forming an opening portion while closing the door; a fire-resistant gasket formed in a ring shape along the door frame or the outer peripheral portion of the inner surface; A watertight gasket provided in parallel with the inside of the refractory gasket; and a holding member for accommodating the refractory gasket and the watertight gasket.         The disaster-prevention door structure according to item 1 of the scope of the patent application, wherein the fire-resistant gasket is a material that expands when heat is transmitted.         The disaster-prevention door structure according to any one of claims 1 or 2, wherein the fire-resistant gasket is provided with at least one and the water-tight gasket is provided with several.         The disaster-prevention door structure according to any one of claims 1 or 2 in the scope of the patent application, further comprising a first locking device, the first locking device is used to fix the door and the door frame, and includes: screwing on the first A first nut of a bolt, the first bolt is a spring material fixed to the inner surface of the door, inserted by the first bolt, and simultaneously held by the door and the first nut; and rectangular when viewed from the front The washer is a first protruding portion provided on the side of the opening portion of the door frame and penetrating a through hole. The washer is for the first bolt and the spring material to pass through the through hole when the door is closed to the door frame. The hole can be turned back.         The disaster-prevention door structure according to any one of claims 1 or 2 of the patent application scope, further comprising a second locking device, the second locking device fixes the door and the door frame, and includes: in a reversible state The second bolt fixed to the rocker provided at the second protruding part of the opening side of the door frame is screwed to the second bolt formed by the female screw formed by the rocker; the second nut is fixed to the door, and the second bolt is When the door is closed to the door frame, it can be screwed to the second nut.         The disaster-prevention door structure according to any one of claims 1 or 4 or 5 of the patent application scope, further comprising an inner door, and the inner door is disposed opposite to the door through the door frame.         The disaster-prevention door structure according to item 6 of the scope of the patent application, characterized in that the inner surfaces of the aforementioned door and the inner door are affixed with a heat-insulating material having fire resistance.