TWI644011B - Disaster prevention door structure - Google Patents

Abstract

A disaster prevention door structure that provides simple operation, tsunamis, fire and earth-rock disasters, and ensures water resistance, fire resistance and earth pressure resistance. The structure is an outer door and an inner door of a double-weighted structure, and is fixed to a door frame in a reversible state, and a refractory gasket is formed along the outer door and the outer peripheral portion of the inner surface of the inner door. a watertight gasket is disposed on the inner side of the watertight gasket; a heat insulating material is fully posted on the inner surface of the watertight gasket; the watertight gasket and the refractory gasket are received in a maintaining member; and the outer door is fixed And a first locking device or a second locking device of the door frame; the outer door, the inner door and the door frame are preferably made of steel.

Description

 Disaster prevention door structure  

The invention relates to a disaster prevention door structure, which can correspond to a tsunami, fire and earth-rock flow disaster.

In order to prevent the "Nanhai Trench Earthquake" that is expected to occur in the near future, it is necessary to face the development of a disaster prevention door structure used as a shelter for earthquakes and tsunami countermeasures. According to the contents of the cabinet published in 2013, the number of deaths caused by the tsunami caused by the huge earthquake in the South China Sea has increased significantly by 13 times compared with the number predicted by the Central Disaster Prevention Conference in 2003. Among them, those who died in the tsunami accounted for 70% of the total. In addition, the earth-rock disaster caused by the concentrated heavy rain that occurs every year, the earth and stone intrusion from the weaker windows or doors of the building, and the loss of valuable human life, so it is hoped that the disaster-resistant door structure that can cope with various disasters can be developed.

According to the inventions such as Patent Documents 1 to 3, various inventions relating to the structure of the disaster prevention door have been made.

In the frontal disaster prevention frame of the invention disclosed in Patent Document 1, the building is deformed or cracked due to an abnormal compressive force during an earthquake, and the frame supporting the door attached to the front of the building is deformed, so that the door or the like It is difficult to switch, or the frame is distorted by overheating in a fire, and the door cannot be opened or closed. In order to avoid the above situation and ensure safety, several reinforcing materials are used as the truss structure.

Patent Document 2 discloses a door crimping tool of the invention and a pressure bonding tool having the same The door, the door pressure connector has a simple structure, and has a low manufacturing cost and installation cost, and a new door pressure connector and a door having the door pressure-bonding device capable of improving the soundproofness, smoke resistance and water resistance of the door. Specifically, the door pressure fitting is composed of a resisting lever and a joint portion provided by either of the abutting projections and the approaching passage, and the door panel and the door frame in the door are provided with the abutting lever and the joint portion. In one case, the abutting lever is retracted, and the abutting protrusion is guided along the approach path to the fitting point to press the door panel toward the door frame.

Patent Document 3 discloses that the structure of the invention is such that the disaster prevention door that can block the opening of the structure and the disaster prevention door lock device for blocking the disaster prevention door are used in order to exhibit disaster prevention performance and sound insulation performance such as fire performance. By operating the grip, etc., the disaster prevention door can also be locked in a high airtight state. Specifically, when the door body is returned in the locking direction, the rod is released from the holding state by the trigger device, and is moved upward by the latch lock. As a result, the tip end portion of the rod is guided to the inner tapered surface and the abutting surface of the holder by the urging force of the compression coil spring. At this time, the door body which is retracted by the hinge is sealed with the sealing material while sealing the opening, thereby achieving disaster prevention performance and sound insulation performance such as fireproof performance required for disaster prevention.

Previous technical literature:

Patent Document 1: JP-A-2013-163962

Patent Document 2: JP-A-2009-114650

Patent Document 3: JP-A-2008-303689

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

(1) Although a structure for increasing the strength of the door frame is disclosed, there is no mention 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, setting costly. In addition, the premise is that a standardized product mass-produced at a factory is installed, and therefore, it may be difficult to install it on an existing structure.

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

(4) The above structure is quite complicated, and requires a high degree of technology during construction, so the cost is high and the construction period is long, and it is not popularized to the general household.

In order to ensure the necessary safety in the event of a disaster, the disaster prevention door structure must have all of the following properties: water resistance to tsunami wave force, fire resistance to tsunami fire, and earth pressure resistance to earth and rock disasters. With the increasing awareness of disaster prevention, the demand for disaster prevention door construction in individual homes is also increasing. In view of the disasters that have occurred in recent years, the above-mentioned needs are also quite large in families with elderly, young children and physically disabled people.

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

In order to solve the above problems, the invention of claim 1 is a disaster prevention door structure (hereinafter referred to as a main door structure), which is characterized in that it includes a door having a surface and an inner surface, and a door frame that forms an opening and closes the door, along the door frame An annular refractory gasket is provided on the outer circumference of the inner surface of the door, and is provided on the watertight gasket of the refractory gasket, and the maintenance member for accommodating the refractory gasket and the watertight gasket.

According to this configuration, the door is configured to provide an outer side of the annular watertight gasket along the outer peripheral portion of the door frame or the inner surface of the door, and is provided with a refractory gasket, thereby protecting the watertight gasket from the fire caused by the tsunami fire. heat. In addition, even when the shelter is soaked by the tsunami, it can pass through Waterproof gaskets prevent seawater from invading the door. Further, since the refractory gasket and the watertight gasket are housed in the maintenance member, the fire resistance and the watertight performance can be maintained for a long period of time.

According to a second aspect of the invention, in the door structure of the first aspect, the refractory pad is a material that expands when heat is transmitted.

With this configuration, the refractory pad is a material that expands when heat is transmitted, so the refractory pad expands due to the hot air of the fire, sealing the gap created between the door and the door frame. As a result, flames and toxic gases can be prevented from entering the interior of the shelter.

According to a third aspect of the invention, in the door structure of the invention of the first or the second aspect, at least one of the refractory linings is provided, and the watertight gasket is provided in plurality.

According to this configuration, since there are several watertight gaskets, it has stronger watertightness than the structure of the door.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the first locking device includes a fixed door and a door frame, and the first locking device includes: The first nut that is screwed to the first bolt is inserted into the first bolt, and is spring-loaded by the door and the first nut, and a slightly rectangular washer from the front, and is provided in the opening of the door frame. The first protruding portion having the through hole is opened, and when the door is closed to the door frame, the washer can be retracted while the first bolt and the spring material penetrate the through hole.

According to this configuration, the washer inserted by the first bolt is formed to be reversibly fixed to the door by the 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. The washer is returned to a predetermined angle (for example, 90 degrees.), and the gasket overlaps with the first projection from the front. In this state, the first bolt is locked, and the movement of the washer in the door direction is restricted by the first protruding portion, and the first protruding portion is pressed. As a result, it can be easily Lock the door.

According to a fifth aspect of the present invention, in the door structure according to any one of the first to third aspect, the second locking device that fixes the door and the door frame is further provided, and the second locking device is in the door frame opening portion. The second protruding portion provided on the side has a rocker that can be repositioned and fixed, a second bolt that is screwed to the female screw formed on the rocker, and a second nut that is fixed to the door, and the door is closed to the door frame. The second bolt can be screwed to the second nut.

According to this configuration, the second locking device is a second protruding portion provided on the side of the opening of the door frame, and has a rocking rod that can be repositioned and fixed, and is screwed to the female screw formed on the rocker. The second bolt fixed to the rocker and the second nut fixed to the door can be screwed to the second nut when the door is closed to the door frame, so that the door can be easily locked. For example, the electric wrench can be prepared at the shelter first, and the second bolt can be locked with an electric wrench to easily lock the door.

According to a sixth aspect of the present invention, in the door structure according to any one of the first to fifth aspect, the inner door is provided to face the door frame.

According to this configuration, the door is constructed as a double door having a door and an inner door, and the door and the inner door are disposed opposite to each other across the door frame, thereby improving water resistance, fire resistance and soil pressure resistance performance compared with a door.

According to a seventh aspect of the invention, in the door structure of the sixth aspect, the inner surface of the door and the inner door is provided with a heat insulating member having fire resistance.

According to this configuration, since the heat insulating member having the fire resistance is attached to the inner surface of the door and the door, the heat insulating performance can be improved, and the temperature rise in the internal space can be suppressed for the high temperature due to the fire.

1, 201‧‧‧ door structure

3, 203‧‧‧ door frame

3a‧‧‧ reinforcing plate

4, 204‧‧‧ outside door

4a, 4b, 4c, 4d‧‧‧ ring-shaped maintenance materials

5, 205‧‧ ‧ inner door

5a, 5b‧‧‧ watertight gasket

6‧‧‧Fire lining

7‧‧‧1st locking device

8‧‧‧Insulation

9‧‧‧Fixed rod

10‧‧‧ openings

31, 32, 33, 34‧‧‧ frame materials

70‧‧‧Highlights (1st protrusion)

71‧‧‧1st bolt

72‧‧‧1st nut

75‧‧‧through holes

76‧‧‧Washers

77‧‧‧ Spring

91‧‧‧Body

92‧‧‧ wall push plate

93‧‧‧ jack

94‧‧‧door push plate

207‧‧‧2nd locking device

270‧‧‧ protruding material (2nd protrusion)

271‧‧‧2nd bolt

272‧‧‧2nd nut

273‧‧‧Shake stick

274‧‧‧Axle Bolts

275‧‧‧ pedestal

276‧‧‧Shake stick stopper

35, 37‧‧‧Flange (1st protrusion)

235, 237‧‧‧Flange (2nd protrusion)

Fig. 1 is a schematic perspective view showing the structure of the door of the first embodiment.

Fig. 2 is a cross-sectional view of the outer door of the embodiment, and (b) is a partial inner view of the same door.

Fig. 3 (a) is a cross-sectional view showing a refractory gasket and a watertight gasket of the embodiment 1, (b) is a cross-sectional view showing a state in which the gasket door frame and the outer door are fixed, and (c) is a view showing the same gasket. A cross-sectional view of the expanded state.

Fig. 4 (a) is a perspective view showing a state in which a door frame of the embodiment 1 is protruded from a protruding portion, and (b) is a front view of the same reinforcing plate.

Fig. 5 (a) is a side cross-sectional view of the first lock device, and (b) is a front view from the same inner door side.

[Fig. 6] is a part drawing of a fixed rod.

Fig. 7 is a front elevational view showing the inner door side of the second lock device of the second embodiment.

[Fig. 8] is a plan view in the same cross section.

Fig. 9 is a front elevational view showing the inner door side in a state in which the outer door and the door frame are fixed by the second lock device in the second embodiment.

Fig. 10 is a plan view in the same cross section.

Fig. 11 (a) is a partial cross-sectional view showing the use of the grooved steel for the door frame in the first and second embodiments, and (b) is a partial cross-sectional view when the H-shaped steel is used.

Hereinafter, an embodiment 1 of the present invention will be described with reference to Figs. 1 to 6 . Implementation type The door structure 1 of the state 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 that is slightly rectangular along the outer circumference of the outer surface of the outer door 4, and is provided The watertight gaskets 5a and 5b on the inner side of the refractory lining 6, the annular support members 4a, 4b, 4c, and 4d (maintenance members) for accommodating the refractory lining 6 and the watertight linings 5a and 5b, and the first lock device 7.

As shown in FIGS. 1 and 4, the door frame 3 is a structure in which the frame members 31, 32, 33, and 34 are combined into a square shape to form the opening portion 10, and the outer edge shape is a rectangular structure. The outer door 4 is removably fixed to the outer surface of the frame body 32 (hereinafter referred to as the outer side surface), and the inner door 5 is removably fixed to the inner side surface (hereinafter referred to as the inner side surface). Here, the outer side refers to the side opposite to the outer space at the time of installation, and the inner side refers to the side opposite to the inner space at the time of installation. Further, the protruding member 70 (first protruding portion) is protruded from the outer side of the central portion of the inner edge of the frame member 31. A through hole 75 is formed in the protruding material 70.

The frame members 31, 32, 33, and 34 are preferably a square cylinder or an angular steel tube (exemplified as JIS G 3466 75 mm × 75 mm). Further, it is also possible to weld and fix the lip-shaped reinforcing plate 3a which is slightly in the same shape as the frame surface on the outer side and the inner side. 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. Further, in the present embodiment, the protruding member 70 is provided on the frame member 31, but may be provided on 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 reversible manner. The material of the outer door 4 is an iron plate, and the thickness is preferably 6 to 12 mm. In the present embodiment, it is exemplified to have a thickness of 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 slightly rectangular refractory liner 6 is provided on the outer peripheral portion of the inner surface of the outer door 4. In addition, the inner side of the refractory liner 6 is provided with two watertight gaskets 5a, 5b. . In addition, a door handle (not shown) is provided on the surface. Here, the inner surface of the outer door 4 refers to a facade that faces the outer side surface of the door frame 3, and the surface refers to the other side surface that is not opposed to the outer side surface of the door frame 3.

The annular maintaining members 4a, 4b, 4c, and 4d are protruded in a state in which the inner faces of the outer door 4 are connected in the circumferential direction. The refractory lining 6 and the watertight linings 5a and 5b are respectively accommodated in the annular holding members 4a, 4b, 4c, and 4d and three recessed portions formed on the inner surface of the outer door 4.

The refractory lining 6 is a structure in which a fiber sheet having fire resistance is wound up, and the fiber sheet is formed into a rolled shape, and expands when the temperature rises. The fiber sheet exemplified here is a Tektronix (registered trademark) silver sheet of DuPont, which will be aramid fiber, fluorine-containing fiber, carbon fiber, polytetrafluoroethylene (PTFE) fiber, polyimine fiber, polyarylate. The fibers, as well as the polyphenylene sulfide (PPS) fibers, are woven into a sheet shape, and then aluminum is vapor-deposited on the woven fibers, and the resin is coated thereon to prevent deterioration.

Next, the operation of the refractory gasket 6 and the watertight gaskets 5a and 5b when the temperature rises due to the heat of the flame will be described 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 in which the upper ends of the refractory linings 6 and the annular garnishes 4a, 4b, 4c, and 4d are higher.

As shown in FIG. 3(b), in a state where the outer door 4 and the door frame 3 are fixed, the watertight gaskets 5a, 5b are adhered to the outside of the door frame 3. In this way, a state in which the gap between the outer door 4 and the door frame 3 is sealed by the double seal is formed, and the water pressure can be withstood even if the tsunami strikes or soaks water.

As shown in Figure 3(c), when the flame is heated, the temperature of the refractory liner 6 Ascending, the refractory liner 6 expands. At this time, the refractory lining 6 is higher in height than the annular maintaining members 4c and 4d, and the refractory lining 6 and the watertight linings 5a and 5b cooperate to seal the gap between the outer door 4 and the door frame 3. In addition, the protective watertight gaskets 5a, 5b are not damaged by the high heat caused by the flame. In this way, even if a tsunami or tsunami fire occurs, it can prevent flame invasion and ensure watertightness.

The inner side of the annular maintaining member 4a protruding from the inner surface of the outer door 4 is entirely covered with the heat insulating material 8. The heat insulating material 8 is preferably made of a glass wool board, and the adhesion between the door frame 3 and the outer door 4 when the outer door 4 is closed can be improved, and the heat insulating performance can be improved.

The inner door 5 is fixed in a state in which the inner side of the frame member 32 is reversible. Further, similarly to the outer door 4, the refractory gasket 6 and the watertight gaskets 5a and 5b are provided on the inner surface of the inner door 5, and are housed in the annular maintenance members 4a, 4b, 4c, and 4d. Moreover, the heat insulating material 8 is fully attached to the inner side of the annular support material 4a. The configuration is almost identical to the outer door 4, and therefore the description is omitted. Here, the inner surface of the inner door 5 refers to a front surface that faces the inner side surface of the door frame 3, and the surface refers to the other side surface that is not opposed to the inner side surface of the door frame 3.

As shown in FIG. 5, the first lock device 7 that fixes 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 member 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, and the washer 76 is pressed by the expansion and contraction force, and is inserted into the first bolt 71 to be disposed on the inner surface of the outer door 4. The washer 76 is inserted through the first bolt 71 and stacked on the spring member 77. The spring member 77 and the washer 76 are held by the first nut 72 and the outer door 4 that are screwed to the first bolt 71 in a state where a certain compressive force is applied to the spring member 77. That is, the washer 76 is fixed to the outside in a state in which it can be returned via the spring member 77. Door 4.

The protruding member 70 is provided with a through hole slightly larger than the outer edge of the gasket 76 and slightly rectangular. The through hole 75 passes through the washer 76 while closing the outer door 4, and at the same time, the pad pattern is returned to a fixed angle (for example, 90 degrees), and the movement of the washer 76 in the direction of the outer door 4 is restricted. 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. Further, regarding the pad pattern 76, when the outer door 4 is closed, it is disposed in the inner region of the through hole 75 in a front view.

When the outer door 4 is closed, the washer 76 that penetrates the through hole 75 is retracted at a fixed angle in the V direction, and is in a state of being overlapped with the protruding member 70 when viewed from the front. In other words, the first nut 72 can be locked without being removed from the through hole 75. Thereafter, the outer door 4 can be fixed to the door frame 3 by locking the first nut 72. As a result, fire-resistant and watertight liner pad 5a, 5 b cooperating to improve watertightness and fire resistance. Also, when locking the nut, it is preferable to use a previously equipped electric wrench. With the power tool, it is easy to lock up without much effort.

The inner door 5 is normally used in the open state, but when the inner door 5 is closed and fixed, it is preferable to use the fixing rod 9 that supports the inner door 5. As shown in FIG. 6, the fixing rod 9 is configured to have one end portion of the rod portion 91 having both end portions, the fixed wall pressing plate 92, and the other end portion is connected to the pressing plate by the jack 93. 94.

A wall pressing plate 92 is provided on a wall surface facing the inner door 5, and a door pressing plate 94 is provided on the surface of the inner door 5 to operate the jack 93 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.

It is usually installed in a fixed place inside the house. When it is used, it is closed in the inner door. In the state, the inner door 5 is supported from the indoor side. The fixing rod 9 is attached to the ceiling lifting unit and can be used when it is lowered to the lower side during evacuation.

When the inner door 5 is fixed in the closed state, the inner door 5 is pressed by the fixed rod 9, so that it is preferable to use a door such as a door handle or the like.

The present door structure 201 of the second embodiment will be described below with reference to Figs. 7 to 10 . Embodiment 2 is basically the same as Embodiment 1 and the part number is started at 200. The illustration and description are used to explain the difference.

The door structure 201 includes the same door frame, outer door, and inner door as the first embodiment. The door frame has the same protruding material 270 (second protruding portion) as that of the embodiment 1 protruding from the door frame. Further, the inner surfaces of the outer door and the inner door are provided with a refractory gasket, a watertight gasket, an annular maintenance material, and a heat insulating member in the same manner as in the first embodiment.

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

A pedestal 275 forming a female screw is provided on the inner surface of the protruding member 270 (the other surface not facing the outer door 204). A shaft bolt 274 for pivoting the rocker 273 is screwed to the pedestal 275. A rocker stopper 276 for restricting the return of the rocker 278 is protruded from the upper end of the pedestal 275.

A female screw is formed on the end of the rocker 273, and is screwed to 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 to the second bolt.

As shown in FIG. 7, when the outer door 204 is not fixed by the second locking device 207 In the case of the door frame 203, the rocker 273 supported by the shaft bolt 274 is suspended.

When an earthquake occurs, it is predicted that a tsunami or tsunami fire will occur, and the evacuation space will be quickly entered, and the outer door 204 and the door frame 203 will be closed.

The order of the close outer door 204 and the door frame 203 will be described below. When the rocker 273 is returned, the second bolt 271 is positioned directly above the second nut 272 when viewed from the plane. The front end portion of the second bolt 271 is inserted into a hole formed by the female screw of the second nut 272. The second bolt 271 is returned to be screwed to the second nut 272. In this way, the outer door 204 and the door frame 203 are fixed. It is better to use a previously prepared electric wrench for the screw industry. With the power tool, the screwing industry can be easily carried out without much effort. Further, it is preferable that the position of the second bolt 271 at the time of stopping the return by the rocker stopper 276 is set to be located directly above the second bolt 272. In this way, it becomes easier to screw with the second nut.

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

The above embodiments are exemplified as ideal embodiments for carrying out the invention. The present invention is not limited to the above-described embodiments, and it is within the technical scope of the present invention to change the scope of the invention without departing from the spirit and scope of the invention.

For example, although the door frames 3 and 203 have a square-shaped steel pipe structure, as shown in FIG. 11( a ), the groove-shaped steel may be used as a frame material, and a concave portion of the groove-shaped steel may be formed to face the opening portion. In the state of 10, 210, a square structure is formed. Alternatively, as shown in Fig. 11 (b), an H-shaped steel material may be used as the frame material. Alternatively, the above configuration may be used in combination to form a square. At this time, the first projecting portion and the second projecting portion are preferably flanges 35, 37, 235, and 237 located on the outer door 4, 204 side.

In the example described here, the door structure 1, 201 is suitable for a swing door, but it is also applicable to a sliding door, which is self-evident.

The invention can provide a safety and safety disaster prevention door structure capable of responding to tsunami, fire, tornado and earth-rock disasters. Especially in the coastal areas, its industrial use value is quite large.

Claims (4)

A disaster prevention door structure, comprising: a door having a surface and an inner surface; forming an opening portion while closing a door frame of the door; and forming an annular refractory pad along the outer periphery of the door frame or the inner surface; a watertight gasket disposed on the inner side of the refractory lining; a lining for accommodating the refractory lining and the watertight lining; and a first locking device, wherein the first locking device fixes the door and the door frame, and includes: screwing In the first nut of the first bolt, the first bolt is a spring material that is fixed to the inner surface of the door, is inserted by the first bolt, and is held by the door and the first nut; and a front view a rectangular gasket is provided on a side of the opening of the door frame and has a first protruding portion through which the through hole is inserted, and the gasket is configured to penetrate the first bolt and the spring material when the door is closed to the door frame It can be returned in the state of the through hole. A disaster prevention door structure, comprising: a door having a surface and an inner surface; forming an opening portion while closing a door frame of the door; and forming an annular refractory pad along the outer periphery of the door frame or the inner surface; a watertight gasket disposed on the inner side of the refractory lining; a maintaining member for accommodating the refractory lining and the watertight lining; and a second locking device, wherein the second locking device fixes the door and the door frame, and includes: In a moving state, the rocker is fixed to the second protruding portion provided on the side of the door frame opening. a second bolt screwed to the female screw formed by the rocker; a second nut fixed to the door, wherein the second bolt is screwed to the second screw when the door is closed to the door frame cap. A disaster prevention door structure, comprising: a door having a surface and an inner surface; forming an opening portion while closing a door frame of the door; and forming an annular refractory pad along the outer periphery of the door frame or the inner surface; a watertight gasket disposed on the inner side of the refractory lining; a lining for accommodating the refractory lining and the watertight lining; wherein the inner door is disposed opposite to the door via the door frame. The disaster prevention door structure according to claim 3, characterized in that the door and the inner surface of the inner door are provided with a heat insulating member having fire resistance.