TWI644013B - Refractory door construction - Google Patents

Abstract

A fire-resistant door is constructed as a single-piece sliding door composed of a frame body and a fire-resistant door. The fire door is a sliding door type door that can be installed to slide the frame. The fire door is a two-layer structure comprising: an inner door panel, a water filling body, a space material, an outer door panel, and an outer edge panel. The water filling body is composed of a plurality of square cylinders, and the interior is filled with water. When the temperature of the surroundings rises due to the heat of the flame, the temperature rise of the fire door is suppressed by the latent heat effect of filling the water. A sealing plate and/or a refractory gasket is provided on the fire door to seal the gap between the shelter and the fire door. Thereby, it is possible to suppress the intrusion of gas generated by the flame, and to provide a fire-resistant door structure that can cope with a tsunami and a tsunami fire.

Description

 Refractory door construction  

The invention relates to a fire resistant door structure which can cope with tsunami and tsunami fires.

Tsunami measures and fire countermeasures have always been regarded as different disaster prevention issues. However, in the Great East Japan Earthquake that occurred in 2011, the fact that a fire was caused by the tsunami was confirmed. When there is a large amount of water in the tsunami, it is unimaginable to have a fire, but the reason is as follows, that is, the fuel leaked from the ship or the car that flows out due to other drifting objects colliding with the oil cylinder or tsunami (heavy oil, kerosene) , gas, etc.) and caught fire, drifting to the flooded area of the tsunami, and expanding the fire disaster.

The tsunami fires caused by the Great East Japan Earthquake are not exceptions due to extremely special conditions, but may occur frequently in other tsunami disasters. Therefore, in order to respond to earthquake disasters, it is necessary to take measures to prevent tsunami and tsunami fires.

At present, various inventions have been proposed as a life-saving measure for disasters such as earthquakes.

The floating type multi-person emergency shelter disclosed in Patent Document 1 can be used as a public facility such as a citizen hall or a library, and is easy to float when a tsunami strikes, and can ensure that there is an evacuation place for people to take refuge. It has access to the outside entrance and is a double structure of watertight doors and airtight doors.

The tsunami countermeasure door for the refuge disclosed in Patent Document 2 is The personal residences used in daily life are also available for people to take refuge when the tsunami strikes. Specifically, it is a sliding door type in which the wall surface around the opening is closed by a door pressing mechanism.

The reinforced concrete refuge disclosed in Patent Document 3 is a sliding door type that can withstand impact water pressure. The sliding door is densely arranged with a light V-rib frame in the short side direction and has a water inlet preventing device.

[Patent Document 1] JP-A-2015-020603

[Patent Document 2] JP-A-2013-015796

[Patent Document 3] JP-A-2013-160037

The usage mode disclosed in Patent Document 1 is that the entrance to the outside is a dual structure of a watertight door and an airtight door, and the watertight door is in a constantly open state. This is because the watertight door has weight and the switch requires considerable effort. In the above-mentioned manner, when the earthquake occurs, the hinge of the heavy watertight door may be damaged, thus losing the function of the watertight door. That is to say, if it is a switch-type door, the hinge used to make the heavy door move back becomes a weakness. The door structure disclosed in Patent Document 2 is quite complicated and cannot reduce the cost. In the door structure disclosed in Patent Document 3, fire countermeasures have not been sufficiently studied.

An object of the present invention is to provide a sliding door type fire door structure which is highly safe against earthquakes, tsunamis and tsunami fires.

In order to solve the above problems, the invention of claim 1 is a fire door structure comprising: a frame provided in a shelter, a two-layer structure fire door provided in a slidable state in a frame, and an exhaust valve One of the two-layer structure, filled with water and air The filling layer has one end portion of the exhaust valve penetrating into a space filled with air in the water filling layer, and the other end portion is protruded from the outer space.

According to the above configuration, the fire door structure is a sliding door type that is slidably provided in the casing, so that the earthquake load is received by the entire frame. Therefore, compared with the switch type door, the earthquake resistance bearing performance can be improved.

The fire door is a two-layer structure in which one layer stores water having a larger heat capacity, so that even if a tsunami fire occurs, the heat of the flame can be absorbed.

Even when the water in the water-filled layer is vaporized by the heat of the flame or the like, the generated vapor is discharged to the external space through the exhaust valve, so that the internal pressure rise can be suppressed.

Further, when the water vaporizes and changes to the steamer, the latent heat effect is exerted, so that the cooling effect can be expected. As a result, the temperature rise of the fire door can be suppressed.

According to a second aspect of the invention, in the fire-resistant door structure according to the first aspect, the water-filled layer is divided into rows.

According to the above configuration, since the water-filled layer is divided into rows, the swing of the water generated when the fire-resistant door is constructed and closed can be reduced, and the door can be smoothly opened and closed.

In addition, even if the water-filled layer which is divided into rows is damaged for some reason, the water-filled layer of other columns can be used to absorb the heat caused by the flame, and the latent heat effect can be expected.

The invention of claim 3 is characterized in that in the fire door structure according to the first or second aspect, the other layer of the two-layer structure is an air layer filled with air.

According to the above configuration, the other layer of the two-layer structure is filled with air, so that it is expected to exert an insulating effect. In this way, the temperature rise in the shelter can be suppressed.

According to a fourth aspect of the invention, in the fire-resistant door structure according to the first aspect, the sealing mechanism further includes a sealing mechanism, and the sealing mechanism is a refuge when the fire-resistant door is in a closed state and reaches a preset temperature. The gap created between the door and the fire door is sealed.

According to the above configuration, the sealing mechanism is provided, and when the temperature is reached, the sealing mechanism seals the gap generated between the refuge and the fire door, thereby preventing the flame from entering the refuge.

According to a fifth aspect of the invention, in the refractory door structure of the fourth aspect, the sealing mechanism includes: a sealing plate fixed to the refractory door in a reversible state, and one end portion connected to the sealing plate, and the other An actuator having one end fixed to the fire door, the actuator is configured to displace the sealing plate when the preset temperature is reached.

According to the above configuration, the sealing mechanism includes a sealing plate fixed to the fireproof door in a reversible state, and an actuator in which one end portion is connected to the sealing plate and the other end is fixed to the fire door, so that the sealing plate and the sealing plate are The actuator is mounted on the fire door to easily seal the gap.

The invention of claim 6 is characterized in that in the fire door structure according to Item 5, the actuator includes a shape memory alloy spring for displacing the sealing plate.

According to the above configuration, the actuator structure includes a shape memory alloy spring, that is, a passive type actuator, so that the sealing plate can be changed at a preset temperature without using a complicated structure such as a sensor, an engine, and electric power. Bit.

The invention of claim 7 is characterized in that in the fire door structure according to the fifth or sixth aspect, the sealing plate and the actuator are provided on the outer space side of the fire door, the sealing frame and the outer door panel of the fire door The gap created between the gap and the gap between the outer wall of the refuge and the rear end of the door of the fire door.

According to the above configuration, the sealing plate and the actuator are provided on the outer space side of the fire door, so that the installation, maintenance inspection, and replacement work can be easily performed.

The invention of claim 8 is characterized in that in the refractory door structure according to the fourth aspect, the sealing mechanism has a refractory gasket that winds up the refractory sheet, and the refractory gasket expands when reaching a preset temperature to seal gap.

According to the above configuration, the sealing mechanism has a refractory gasket that winds up the refractory sheet, and thus can have fire resistance.

According to a ninth aspect of the invention, in the refractory door structure of the eighth aspect, the refractory lining is maintained by a storage container that forms an opening space on the opposite side of the mounting surface.

According to the above configuration, the refractory pad is maintained by the container, so that the durability of the refractory pad can be improved. Further, since the storage container holding the refractory gasket forms an opening space on the opposite side of the mounting surface, it can be expanded only on the side opposite to the side on which the refractory gasket is attached. As a result, the sealing effect can be improved.

The invention of claim 10 is characterized in that in the fire door structure according to Item 8 or 9, the refractory gasket is annularly disposed on the inner door panel of the fire door, and the refractory door is closed and the shelter is The outer periphery of the formed entrance and exit is opposite.

According to the above configuration, the refractory gasket is annularly disposed on the inner door panel of the fire door, and is opposed to the outer peripheral portion of the inlet and outlet in a state where the fire door is closed, so that the gap between the inner door panel and the refuge can be sealed. . In addition, it is not necessary to protrude on the outer space side of the fire door, so that it can be prevented from being damaged by a tsunami or the like.

1‧‧‧ frame

2‧‧‧ fire door

10‧‧‧Fire door construction

11‧‧‧ vertical frame

12‧‧‧ Lower frame

13‧‧‧上上

21‧‧‧ Inner door

22‧‧‧Water Filling

23‧‧‧External door panels

24‧‧‧ Space materials

25‧‧‧ rim board

251‧‧‧ lower edge plate

252‧‧‧Upper edge plate

253‧‧‧door edge board

254‧‧‧ front side edge panel

28‧‧‧Exhaust valve

40‧‧‧Sliding device

41a, 41b‧‧‧ Wheels

42a, 42b‧‧‧ slide rails

43‧‧‧suspension

44a, 44b‧‧‧Slide support board

51‧‧‧ fixed plate

52‧‧‧ Sealing plate

53‧‧‧Hinges

54‧‧‧Shape memory alloy spring

55‧‧‧Polt spring

56‧‧‧spring support

57‧‧‧Blocking shaft

58‧‧‧Ball joint

59‧‧‧ partition board

61‧‧‧Actuator

72‧‧‧Fire lining

73‧‧‧ storage container

100‧‧‧ entrances and exits

101‧‧‧External space

102‧‧‧ Refuge space

200‧‧‧ shelter

W‧‧‧ Filling water

A‧‧‧ filling air

Fig. 1 (a) is a front view showing a state in which a fire door is closed. (b) is a front view showing the fire door in an open state.

Fig. 2 is a side cross-sectional view showing a state in which a sealing plate and a refractory gasket are mounted.

Fig. 3 is a plan sectional view of the same.

Fig. 4 is a view showing a space metal part.

Fig. 5 (a) is a view for explaining an actuator state in a normal temperature state. (b) is a diagram for explaining that the shape memory alloy spring exceeds the abnormal temperature state.

Fig. 6 (a) is a side cross-sectional view showing the state in which the refractory gasket is mounted. (b) is a front view showing the state in which the refractory gasket is mounted.

Hereinafter, the fire door structure 10 in the embodiment of the present invention will be described with reference to the drawings. The fire door structure 10 is provided at the entrance and exit 100 of the shelter 200.

As shown in FIG. 1, the fire door structure 10 is a single-piece sliding door composed of a frame 1 and a fire door 2. The fire door 2 is a door in the form of a sliding door that is slidably attached to the casing 1. The casing 1 has a U-shape when viewed from the side of the external space 101 in the direction of the evacuation space 102. When the fire door 2 is closed, the entrance and exit 100 and the external space are blocked. In the open state, the entrance and exit 100 and the outside are closed. Space 101 is connected. The casing 1 includes a vertical frame 11 extending in the vertical direction, a lower frame 12 connected to the lower portion of the vertical frame 11, and extending in the horizontal direction, and an upper frame 13 connected to the upper portion of the vertical frame 11 and extending in the horizontal direction.

The vertical frame 11 is a steel plate having an L-shaped cross section, and extends vertically from the outer surface of the refuge 200, and is bent toward the entrance and exit 100 of the refractory door 2, and extends in parallel on the outer surface of the refuge 200. The groove formed by the vertical frame 11 and the refuge 200 is closed at the fire door 2 In the state of the door, the front end portion of the door of the fire door 2 is accommodated.

The lower frame 12 is a steel plate having an L-shaped cross-sectional view, and extends vertically from the refuge 200, and is bent toward the upper frame 13 to extend in parallel to the outside of the refuge 200. As shown in FIG. 2, the outer surface of the refuge 200 and the groove portion formed by the lower frame 12 accommodate the induction plate 47, and the induction plate 47 is used to guide the direction in which the refractory door 2 slides. Further, a stopper is provided at the end of the free end of the lower frame 12 to prevent the fire door from coming off the frame (not shown).

The induction plate 47 is formed with a concave portion, and the concave portion accommodates the guide plate 48 in a slidable state, and the guide plate 48 is protruded from the entire length of the lower side edge plate 251. In this way, the fire-resistant door 2 can be detached from the out-of-plane direction and can slide smoothly.

The gap between the induction plate 47 and the lower side edge plate 251 is preferably a minimum interval which does not contact each other even in consideration of a maximum allowable setting error. This is to ensure that the fire door 2 can slide smoothly while minimizing the gap. In this way, the flame and the gas generated by the flame can be suppressed.

The upper frame 13 is a steel plate having an L-shaped cross section, and extends vertically from the shelter 200, and is bent in the direction of the lower frame 12 to extend in parallel on the outer surface of the shelter 200. As shown in FIG. 2, the gully 200 and the groove formed by the upper frame 13 accommodate the sliding device 40 which hangs the refractory door 2 and slides it. Further, a stopper (not shown) is provided at the free end portion of the upper frame 13 to prevent the fire door 2 from coming out of the frame.

The runner 40 includes rollers 41a, 41b, rails 42a, 42b, a hanger 43, and rail support plates 44a, 44b.

The hanger 43 has a T-shape in a cross-sectional view, and the fire door 2 is suspended at the tail side, the center portion, and the front side 3 of the door. At the front end of the T-shaped suspension 43 in a rotatable state The rollers 41a, 41b are mounted. The rollers 41a, 41b are placed on the slide rails 42a, 42b in a slidable state, and the slide rails 42a, 42b are fixed to the rail support plates 44a, 44b.

The outer diameters of the rollers 41a and 41b can be accommodated in the space surrounded by the shelter 200, the upper frame 13, and the rail supporting plates 44a and 44b, and the larger the size, the more preferable. As a result, the wheel pressure can be suppressed, the force required for sliding can be reduced, and the fire door 2 can be smoothly slid.

The gap between the rail supporting plates 44a, 44b and the upper side edge plate 252 is preferably a minimum interval which does not contact each other even in consideration of an allowable maximum setting error. This is to ensure that the fire door 2 can smoothly slide while narrowing the gap as much as possible. In this way, the flame and the gas generated by the flame can be suppressed.

As shown in FIGS. 2 and 3, the fire door 2 includes an inner door panel 21, a water filling body 22, a space member 24, an outer door panel 23, and an outer edge panel 25.

The inner door panel 21 is a rectangular flat plate having a predetermined tsunami load bearing capacity. The inner door panel 21 is preferably a processed steel sheet.

The water filling body 22 is composed of a plurality of square cylinders. The square tubular body is aligned and fixed on the outer space 101 side of the inner door panel 21 without any gap. The upper and lower sides of the square cylinder are fixed to the upper side edge plate 252 and the lower side edge plate 251, and a closed space (water filling layer) is formed inside. The enclosed space stores the filling water W almost entirely, and there are a plurality of filling air A in the upper portion thereof. In order to communicate with the filling air A existing in the plurality of square cylinders, a notch portion 221 is provided at the upper end portion of the surface where the square cylinders are in contact with each other. The square cylinder is preferably a processed angled steel pipe.

The space member 24 is attached to the upper end portion, the intermediate portion, and the lower end portion of the outer side of the water-filled body 22 on the outer space side. The space material 24 is a square tube whose both ends are closed by a blocking plate (not shown) The body is preferably made of a processed angled steel pipe. Further, the grooved steel and the H-shaped steel may be processed.

The outer space side of the space member 24 is fixed to the outer door panel 23 via the space metal member 27. The outer door panel 23 is preferably a processed steel sheet. As shown in FIG. 4, the metal member 27 is composed of a space metal part body 271 and a fixing bolt 272 which are cut in a cylindrical inner surface, and is fixed to the space member 24.

The outer edge plate 25 includes a lower side edge plate 251, an upper side edge plate 252, a door side edge edge plate 253, and a door front side edge plate 254. One end of the rim plate 25 is fixed to the outer door panel 23.

The intermediate portion of the door side edge plate 253 and the door front side edge plate 254 is fixed to the water filling body 22 and the space member 24 via the space material metal member 27. One end (one end on the side of the refuge space) forms a free end, and the other end (one end on the side of the external space) is fixed to the outer edge of the outer door panel 23.

As described above, the inside of the fire door 2 is formed in a two-layer structure of the evacuation space 102 side and the outer space 101 side. Further, a layer on the side of the evacuation space 102 is filled with the filling water W and the filling air A, and a layer on the side of the external space 101 forms a structure filled with air.

Further, in the present configuration, a gap is formed between the door side edge plate 253, the inner door panel 21, and the water filling body 22. Similarly, a gap is also formed between the front side edge plate 254 and the door. By this gap, the air inside the fire door 2 can be discharged to the outside, and the outside air can also be sucked in. In this way, it is possible to suppress the pressure rise caused by the temperature rise and prevent the fire door from being deformed.

Further, the internal space on the side of the evacuation space 102 may be a layer filled with air, and the internal space on the side of the external space 101 may be a layer filled with the filling water W and the filling air A.

Three exhaust valves 28 are attached to the outer door panel 23. The exhaust valve 28 is used to discharge the water vapor generated by heating and heating the filling water W by flame heat or the like to the external space 101. In this way, the pressure rise inside the square tube can be suppressed. The vapor inlet and outlet (the end of one side) penetrates the filling air A, and the vapor discharge port (the other end portion) protrudes from the outer door panel 23 and comes into contact with the atmosphere.

The sealing mechanism is used to seal the gap generated between the fire door 2 and the frame when the ambient temperature reaches a preset temperature due to the heat of the flame. Various examples of the sealing mechanism will be described below.

Sealing Mechanism Example 1: As shown in FIG. 5, the sealing mechanism example 1 includes a fixing plate 51, a sealing plate 52, a hinge 53 to which the rotatable fixing plate 51 and the sealing plate 52 are coupled, and an actuator 61.

As shown in FIGS. 2 and 3, the fixing plate 51 and the sealing plate 52 are disposed at the end portion of the door side edge plate 253 on the evacuation space 102 side and the outer surface of the fire door 2, and are disposed along the frame 1. It is preferable to use the processed steel plate for the fixing plate 51 and the sealing plate 52.

The fixing plate 51 is fixed to the fire door 2. The sealing plate 52 is attached to the fixing plate 51 in a rotatable state via a hinge 53, and is fixed to the fixing plate 51 via an actuator 61 to be described later.

The angle formed by the fixing plate 51 and the sealing plate 52 is preferably 90 to 100 degrees, and more preferably 90 to 95 degrees. In this way, it can be effectively from the actuator The thrust of 61 is transmitted to the sealing plate 52.

The actuator 61 is provided at both end portions and intermediate portions of the fixed plate 51, and is connected in total by three places, and is connected to the sealing plate 52 via the ball joint 58.

The structure of the actuator 61 will be described below with reference to FIG.

The actuator 61 includes a spring support body 56, a seal shaft 57 provided through the spring support body 56, a shape memory alloy spring 54 and a biasing spring 55 provided along the outer circumference of the seal shaft 57, and a shape for separating the shape. A memory plate 54 and a partition plate 59 of the biasing spring 55.

The spring support body 56 has a groove shape in a cross-sectional view, and the intermediate portion (a bottom surface of the groove type) is fixed to the fixed plate 51. In the rising portion of the groove type, an elongated long hole (not shown) is formed in the longitudinal direction, and the sealing shaft is provided to penetrate the long hole.

One end of the sealing shaft 57 is fixed to the sealing plate 52 in a rotatable state via a ball joint 58. The other end of the sealing shaft 57 is a free end. Further, the partitioning plate 59 is fixed near the center in the longitudinal direction.

The shape memory alloy spring 54 is housed in the spring support 56 and spirally wound around the outer circumference of the sealing shaft 57, and is provided along the axial direction of the sealing shaft 57. One end of the shape memory alloy spring 54 is fixed to one side of the concave portion of the spring support 56, and the other end is fixed to the partition plate 59.

The biasing spring 55 is housed in the spring support 56, spirally wound around the outer circumference of the sealing shaft 57, and is disposed opposite to the shape memory alloy spring in the axial direction of the sealing shaft 57. One end of the biasing spring 55 is fixed to the other rising portion of the groove of the spring support 56, and the other end is fixed to the partition plate 59.

The shape memory alloy spring 54 and the biasing spring 55 are mutually compressed and compressed in a displacement amount, and are accommodated in the spring support 56. The biasing spring 55 is not affected by the ambient temperature and produces a force proportional to the displacement. In contrast, the shape memory alloy spring 54 changes its force due to changes in ambient temperature.

Fig. 5 (a) shows a state in which the actuator 61 is in a normal temperature state. In this state, the forces generated by the biasing spring 55 and the shape memory alloy spring 54 are balanced with each other.

Fig. 5(b) shows a state in which the actuator 61 is in a high temperature state. If the temperature rises and exceeds the metamorphic temperature, the shape memory alloy spring 54 generates a tensile force that deforms in the extending direction to compress the biasing spring 55. As a result, the sealing shaft 57 is displaced, and the sealing plate 52 pressed by the sealing shaft 57 is displaced in a direction in which the angle formed by the fixing plate 51 is enlarged. As a result, the gap generated between the refuge 200 and the fire door 2 can be sealed.

Further, when the temperature is again lowered to the abnormal temperature or lower, the tensile force generated by the shape memory alloy spring 54 is reduced, and the biasing spring 55 is pressed to return to the state of Fig. 5(a).

The metamorphic temperature of the shape memory alloy spring 54 is higher than a temperature that can be predicted to rise due to solar heat or the like, and is preferably a temperature at which the heat of the flame can be perceived early.

In the present embodiment, the cross section of the sealing plate 52 is a simple plate shape, but the cross-sectional view may be L-shaped. As a result, the amount of displacement of the sealed actuator 61 can be reduced while the angle formed by the fixing plate 51 and the sealing plate 52 is close to 90 degrees.

Sealing mechanism example 2: The sealing mechanism example 2 includes a storage container 73 in which a concave portion is formed, and a refractory gasket 72. As shown in FIGS. 2, 3, and 6, the storage container 73 in which the concave portion is formed is attached to the surface of the inner door panel 21 in an annular shape along the outer peripheral region. Via the recess, inside The opposite side of the mounting surface of the door panel 21 (the side opposite to the mounting surface), that is, the side of the shelter 200 forms an open space. Moreover, the recessed part of the storage container 73 accommodates the refractory pad 72.

The refractory gasket 72 is a rolled refractory sheet and is housed in a state lower than the height of the front end of the concave portion of the storage container 73. The refractory lining 72 expands toward the opening space of the recess as the temperature rises, and reaches a predetermined temperature, protrudes above the height of the storage container 73, and comes into contact with the outside of the refuge 200. As a result, the gap generated between the fire door 2 and the refuge 200 can be sealed.

The refractory cloth is exemplified by DuPont's Tekec (registered trademark) silver sheet, which mainly consists of aramid fiber, fluorine-containing fiber, carbon fiber, expanded graphite, polytetrafluoroethylene (PTFE) fiber, and polyaluminum. The amine fiber and the polyphenylene sulfide (PPS) fiber are woven into a sheet shape, and then aluminum is vapor-deposited on the woven fabric, and the resin is coated thereon to prevent deterioration. The refractory sheet is rolled up as a refractory liner 72 to form a structure that is expandable when the temperature rises.

Further, in the present embodiment, the refractory lining 72 is maintained by the storage container 73 in which the recessed portion is formed. However, the refractory lining 72 is not limited thereto. For example, the refractory lining 72 may be maintained in a recess formed by the plate-shaped maintaining member. Further, the refractory lining is attached to the surface of the inner door panel 21 in an annular shape along the outer peripheral region, but may be attached in an annular shape along the outer peripheral region of the inlet and outlet 100.

The above embodiments are illustrative of the preferred embodiments for carrying out the invention. The present invention is not limited to the above embodiments, and it is of course within the technical scope of the present invention to make various changes without departing from the scope of the invention.

For example, although the sealing mechanism is exemplified by Examples 1 and 2, respectively, the sealing mechanism may be applied to both of the above examples. Further, a watertight gasket may be provided in the inner side of the refractory gasket 72 shown in the sealing mechanism example 2. In this way, the watertight gasket can be protected from fire damage due to This can improve the watertight performance of the fire door structure 10 in a tsunami or tsunami fire.

Claims (10)

 A fire-resistant door structure comprising: a frame provided in a shelter, a fire-resistant door of a two-layer structure slidably disposed in the frame; and an exhaust valve; a layer of the two-layer structure a water filling layer filled with water and air; the exhaust valve has one end portion penetrating into the space filled with air in the water filling layer, and the other end portion is protruded to the external space.    The fire door structure according to claim 1, wherein the water filling layer is divided into rows.    The refractory door structure according to claim 1 or 2, wherein the other layer of the two-layer structure is an air-filled air layer.    The fire door structure according to claim 1, characterized in that the refractory door structure further comprises a sealing mechanism, and the sealing mechanism seals the refuge and the predetermined temperature when the refractory door is closed. The gap created between the aforementioned fire resistant doors.    The fire-resistant door structure according to claim 4, wherein the sealing mechanism comprises: a sealing plate fixed to the fire door in a reversible state; and an end portion connected to the sealing plate, And the other end portion is fixed to the actuator of the fire door; the actuator is configured to displace the sealing plate when the predetermined temperature is reached, and seal the gap.    The fire door structure according to claim 5, wherein the actuator comprises a shape memory alloy spring, and the shape memory alloy spring is used to displace the sealing plate.    The refractory door structure according to Item 5 or 6, wherein the sealing plate and the actuator are provided on an outer space side of the fire door, and the frame and the fire door are sealed. The gap created between the outer door panels and the gap between the outer wall of the aforementioned refuge and the rear end of the door of the fire door.    The refractory door structure according to claim 4, characterized in that the sealing mechanism has a refractory gasket for winding up the refractory sheet, and the refractory gasket expands when the preset temperature is reached to seal Stop the aforementioned gap.    The fire door structure according to claim 8, wherein the refractory lining is maintained in a storage container that forms an opening space on a side opposite to the mounting surface.    The refractory door structure according to Item 8 or 9, wherein the refractory lining is annularly disposed on the inner door panel of the fire door, so that the refractory door is closed and the refuge is as described above. The outer peripheral portion of the inlet and outlet is formed to face each other.