WO2018070467A1

WO2018070467A1 - Fireproof door structure

Info

Publication number: WO2018070467A1
Application number: PCT/JP2017/036958
Authority: WO
Inventors: 矢野昭彦
Original assignee: 株式会社シェルタージャパン
Priority date: 2016-10-13
Filing date: 2017-10-12
Publication date: 2018-04-19
Also published as: TWI644013B; JPWO2018070467A1; JP6344752B1; TW201814141A

Abstract

Provided is a fireproof door structure capable of coping with tidal waves and tidal wave fires. This fireproof structure 10 is a single sliding door configured from a frame body 1 and a fireproof door 2. The fireproof door 2 is one sheet of a single sliding door which is slidably attached to the frame body 1. The fireproof door 2 has a double-layered structure, and is configured from an inner door plate 21, a water-filled body 22, a spacer member 24, an outer door plate 23, and an outer edge plate 25. The water-filled body 22 is configured from a plurality of square tubes and filled with filling water W. When the ambient temperature is increased by heat from a flame, a temperature increase in the fireproof door 2 is suppressed due to the latent heat effect of the filling water W. The fireproof door 2 is provided with a sealing plate 52 and/or a fireproof packing 72, which seal the gap formed between a shelter 200 and the fireproof door 2. Thus, gas penetration caused by a flame can be suppressed.

Description

Fireproof door structure

The present invention relates to a fireproof door structure that can cope with tsunami and tsunami fire.

Tsunami countermeasures and fire countermeasures have been considered to be separate disaster prevention issues, but in the Great East Japan Earthquake that occurred in 2011, the fact that a tsunami caused a fire has been confirmed. Although it is difficult to imagine the event of a fire in the presence of a large amount of water called a tsunami, the following causes are considered. In other words, other drifting objects collided with fuel (heavy oil, kerosene, gas, etc.) leaked from ships and vehicles washed away by oil tanks and tsunamis, etc. Seems to have expanded.

The tsunami fire caused by the Great East Japan Earthquake is not an exceptional event due to the accumulation of extremely special events, but it has the potential to always occur in other tsunami disasters. Therefore, in order to cope with earthquake disasters, it is necessary to take measures against tsunami and tsunami fire.

A variety of shelters have been proposed as measures for saving lives in the event of an earthquake or other disaster.

Patent Document 1 discloses a floating large-scale emergency evacuation shelter that can be used as a public facility such as a public hall or library during normal times, and can easily ascend and secure an evacuation area when a tsunami strikes. . The entrance to the outside has a double structure of a watertight door and an airtight door.

Patent Document 2 discloses a tsunami countermeasure door for a shelter that can be used as a private house for normal life and that allows humans to evacuate when a tsunami strikes. Specifically, it is a sliding door type door that seals the wall surface around the opening by a door pressing mechanism.

Patent Document 3 discloses a reinforced concrete shelter equipped with a sliding door that can withstand shocking water pressure. The sliding door type door is a light V-shaped rib frame densely arranged in the short side direction, and additionally has a water entry prevention device.

Japanese Patent Laid-Open No. 2015-020603 Japanese Unexamined Patent Publication No. 2013-015796 JP 2013-160037 A

Patent Document 1 discloses a usage mode in which an entrance that passes through the outside has a double structure of a watertight door and an airtight door, and the watertight door is always open. This is because the watertight door is heavy and requires a lot of labor to open and close. When an earthquake occurs in such a mode of use, there is a possibility that the hinge of the heavy watertight door will be damaged and it will not function as a watertight door. That is, a hinge that rotates a heavy weight door is a weak point in the openable door. The door structure disclosed in Patent Document 2 has a complicated mechanism and cannot be reduced in cost. In the door structure disclosed in Patent Document 3, measures against fire have not been sufficiently studied.

An object of the present invention is to provide a sliding door type fireproof door structure having high safety against earthquakes, tsunamis, and tsunami fires.

In order to solve the above-described problems, the invention according to claim 1 is a fireproof door structure, a frame provided in the shelter, a fireproof door having a two-layer structure slidably provided in the frame, and an air vent With a valve, one layer of the two-layer structure is a water-filled layer filled with water and air, the air vent valve penetrates into a space filled with air in one end of the water-filled layer, The other end is provided to protrude into the external space.

According to this configuration, the fireproof door structure is a sliding door type door that is slidably provided on the frame body, so that the entire frame body receives the seismic load. Therefore, the seismic load resistance performance can be enhanced as compared with the openable door structure.

The fire door has a two-layer structure, and water with a large specific heat capacity is stored inside one of the layers, so that it can absorb the flame heat even if a tsunami fire occurs.

Even when the water in the water-filled layer is vaporized due to flame heat or the like, the generated steam is discharged to the external space via the air vent valve, so that an increase in internal pressure can be suppressed.

Furthermore, the cooling effect can be expected because the latent heat effect works when the water vaporizes and changes to steam. As a result, the temperature rise of the fireproof door can be suppressed.

The invention according to claim 2 is the fireproof door structure according to claim 1, characterized in that the water-filled layer is divided into rows.

According to this configuration, since the water-filled layer is divided into rows, it is possible to reduce the sloshing of water that occurs when the fireproof door is opened and closed, and the door can be opened and closed smoothly.

Furthermore, even if some of the water-filled layers divided into rows for some reason are damaged, heat from the flame can be absorbed by the other water-filled layers, and a latent heat effect can be expected.

The invention according to claim 3 is the fireproof door structure according to

claim

1 or 2, characterized in that the other layer of the two-layer structure is an air layer filled with air.

According to this configuration, since the other layer of the two-layer structure is filled with air, a heat insulating effect can be expected. Thereby, the temperature rise in a shelter can be suppressed.

According to a fourth aspect of the present invention, in the fireproof door structure according to any one of the first to third aspects, the gap generated between the shelter and the fireproof door is set to a predetermined temperature with the fireproof door closed. When it becomes, it is further provided with the sealing mechanism which seals.

According to this configuration, since the sealing mechanism that seals the gap generated between the shelter and the fireproof door when a predetermined temperature is reached, it is possible to prevent the flame from entering the shelter.

According to a fifth aspect of the present invention, in the fireproof door structure according to the fourth aspect, the sealing mechanism includes a sealing plate that is rotatably fixed to the fireproof door, and one end connected to the sealing plate and the other end. The actuator has an actuator fixed to a fireproof door, and the actuator is characterized by displacing the sealing plate when a predetermined temperature is reached and sealing the gap.

According to this configuration, the sealing mechanism includes a sealing plate that is rotatably fixed to the fireproof door, and an actuator having one end connected to the sealing plate and the other end fixed to the fireproof door. A gap can be easily sealed by attaching a sealing plate and an actuator to the fireproof door.

The invention according to claim 6 is the fireproof door structure according to claim 5, wherein the actuator includes a shape memory alloy spring for displacing the sealing plate.

According to this configuration, since the actuator is a structure including a shape memory alloy spring, that is, a passive actuator, the sealing plate is formed at a predetermined temperature without using a complicated structure including a sensor, a motor, and electric power. Can be displaced.

The invention according to claim 7 is the fireproof door structure according to claim 5 or 6, wherein the sealing plate and the actuator are provided on the external space side of the fireproof door, and between the frame body and the outer door plate of the fireproof door. And the gap formed between the outer wall of the shelter and the door butt portion of the fireproof door is sealed.

According to this configuration, since the sealing plate and the actuator are provided on the external space side of the fireproof door, it is possible to easily perform installation, maintenance inspection, and replacement work.

The invention according to claim 8 is the fireproof door structure according to claim 4, wherein the sealing mechanism has a fireproof packing obtained by rolling a fireproof sheet, and the fireproof packing expands when a predetermined temperature is reached. The gap is sealed.

According to this configuration, since the sealing mechanism has the fireproof packing obtained by rolling the fireproof sheet, it can have fireproof performance.

The invention according to claim 9 is the fireproof door structure according to claim 8, characterized in that the fireproof packing is held in a storage container having an open space on the opposite side of the mounting surface.

According to this configuration, since the fireproof packing is held in the storage container, the durability of the fireproof packing can be improved. Moreover, since the storage container holding the fireproof packing has an open space on the opposite side of the mounting surface, the fireproof packing can be expanded only on the opposite side of the mounting surface. As a result, the sealing effect can be enhanced.

The invention according to claim 10 is the fireproof door structure according to claim 8 or 9, wherein the fireproof packing is provided on the inner door plate of the fireproof door, on the outer peripheral portion of the doorway formed in the shelter with the fireproof door closed. It is characterized by being provided in an annular shape so as to face each other.

According to this configuration, the fireproof packing is provided on the inner door plate of the fireproof door in an annular shape so as to face the outer peripheral portion of the entrance / exit when the fireproof door is closed. The resulting gap can be sealed. Moreover, it is not necessary to protrude from the external space side of the fireproof door, and damage due to a tsunami can be avoided.

(A) is a front view explaining the state which the fireproof door closed. (B) is a front view explaining the state which the fireproof door opened. It is side surface sectional drawing explaining the attachment state of a sealing plate and a fireproof packing. FIG. It is a figure explaining a space metal fitting. (A) is a figure explaining the state of the actuator in a normal temperature state. (B) is a figure explaining the state which the shape memory alloy spring became more than transformation temperature. (A) is side sectional drawing explaining the attachment state of a fireproof packing. (B) is a front view explaining the attachment state of a fireproof packing.

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

As shown in FIG. 1, the fireproof door structure 10 is a single sliding door composed of a frame 1 and a fireproof door 2. The fireproof door 2 is a sliding door type door that is slidably attached to the frame 1. The frame 1 is U-shaped when the direction of the evacuation space 102 is viewed from the external space 101 side, and the doorway 100 is blocked from the external space when the fireproof door 2 is closed, and the doorway is opened. 100 is provided so as to be connected to the external space 101. The frame 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. Yes.

The vertical frame 11 is an L-shaped steel plate in sectional view, and extends vertically from the outer surface of the shelter 200, bends in the direction of the entrance / exit 100 of the fireproof door 2, and extends parallel to the outer surface of the shelter 200. The groove formed by the vertical frame 11 and the shelter 200 accommodates the door end portion of the fireproof door 2 in a state where the fireproof door 2 is closed.

The lower frame 12 is an L-shaped steel plate in sectional view, extends vertically from the shelter 200, bends toward the upper frame 13, and extends parallel to the outer surface of the shelter 200. As shown in FIG. 2, a guide plate 47 for guiding the direction when the fireproof door 2 slides is housed in a groove formed by the outer surface of the shelter 200 and the lower frame 12. A stopper (not shown) for preventing the fireproof door 2 from jumping out of the frame is provided at the end of the free end of the lower frame 12.

The guide plate 47 is formed with a recess, and a guide plate 48 projecting over almost the entire length of the lower edge plate 251 is slidably accommodated in the recess. Thereby, the fireproof door 2 can slide smoothly, without shaking in an out-of-plane direction.

It is preferable that the gap between the guide plate 47 and the lower edge plate 251 be a minimum interval that does not come into contact even when the maximum allowable installation error is considered. This is to ensure a smooth slide of the fireproof door 2 and to make the gap as small as possible. Thereby, the penetration | invasion of the flame and the gas which generate | occur | produces with a flame can be suppressed.

The upper frame 13 is an L-shaped steel plate in sectional view, extends vertically from the shelter 200, bends toward the lower frame 12, and extends parallel to the outer surface of the shelter 200. As shown in FIG. 2, a traveling device 40 that travels while suspending the fireproof door 2 is housed in a groove formed by the shelter 200 and the upper frame 13. A stopper (not shown) for preventing the fireproof door 2 from jumping out of the frame is provided at the end of the free end of the upper frame 13.

The traveling device 40 includes

rollers

41a and 41b, traveling

rails

42a and 42b, hangers 43, and

rail support plates

44a and 44b.

The hanger 43 has a T-shaped cross-sectional view, and the fireproof door 2 is suspended at three locations on the door bottom side, the center portion, and the door tip side.

Rollers

41 a and 41 b are rotatably attached to the tip of a T-shaped hanger 43. The

rollers

41a and 41b are mounted so as to be able to run on the running

rails

42a and 42b fixed to the

rail support plates

44a and 44b.

The outer diameters of the

rollers

41a and 41b can be accommodated in a space surrounded by the shelter 200, the upper frame 13 and the

rail support plates

44a and 44b, and are preferably as large as possible. Thereby, wheel pressure can be suppressed, the force required for sliding can be reduced, and the fireproof door 2 can be smoothly slid.

It is preferable that the gap between the

rail support plates

44a and 44b and the upper edge plate 252 be a minimum interval that does not come into contact even in consideration of the maximum allowable installation error. This is to ensure a smooth slide of the fireproof door 2 and to make the gap as small as possible. Thereby, the penetration | invasion of the flame and the gas which generate | occur | produces with a flame can be suppressed.

2 and 3, the fireproof door 2 includes an inner door plate 21, a water filling body 22, a space member 24, an outer door plate 23, and an outer edge plate 25.

The inner door plate 21 is a rectangular flat plate and has a strength to withstand a predetermined tsunami load. The inner door plate 21 is preferably a processed steel plate.

The water filling body 22 is composed of a plurality of rectangular cylinders. The rectangular cylinders are fixed in a row without gaps on the entire surface of the inner door plate 21 on the outer space 101 side. The upper and lower surfaces of the rectangular cylinder are fixed to the upper edge plate 252 and the lower edge plate 251, and the inside forms a closed space (water-filled layer). Filled water W is stored in almost the entire closed space, and a small amount of filled air A is present in the upper part thereof. In order to allow the filled air A present in the plurality of rectangular cylinders to communicate with each other, a notch 221 is provided at the upper end of the surface where the rectangular cylinders contact each other. It is preferable that the rectangular cylinder is a processed square steel pipe.

The space material 24 is attached to the upper end portion, the intermediate portion, and the lower end portion of the water filling body 22 on the external space side. The space member 24 is a rectangular tube whose both ends are closed with a blocking plate (not shown), and is preferably a processed square steel pipe. In addition, it may be obtained by processing groove steel or H-section steel.

The outer door plate 23 is fixed to the side surface of the outer space of the space member 24 via a space fitting 27. The outer door plate 23 is preferably a processed steel plate. As shown in FIG. 4, the space fitting 27 is composed of a space fitting main body 271 and a fixing bolt 272 that are threaded on a cylindrical inner surface, and is fixed to the space member 24.

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

The middle part of the door bottom side edge plate 253 and the door end side edge plate 254 is fixed to the water filling body 22 and the space material 24 via the space material fitting 27. One end (end on the evacuation space side) is a free end, and the other end (end on the external space side) is fixed to the outer edge of the outer door plate 23.

As described above, the fireproof door 2 has a two-layer structure in which the inside is partitioned into the evacuation space 102 side and the external space 101 side. The layer on the evacuation space 102 side is filled with the filling water W and the filling air A, and the layer on the external space 101 side is filled with air.

Further, in this configuration, a gap is formed between the door edge side edge plate 253, the inner door plate 21, and the water filling body 22. Similarly, a gap is also formed between the door end side edge plate 254. This gap allows the air inside the fireproof door 2 to be discharged to the outside and allows air from the outside to be taken in. Thereby, the raise of the pressure accompanying a temperature rise can be suppressed and a deformation | transformation of the fireproof door 2 can be prevented.

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

Three air vent valves 28 are attached to the outer door plate 23. The air vent valve 28 is for discharging water vapor generated when the filling water W is heated and vaporized with flame heat or the like to the external space 101. Thereby, the pressure rise inside a square cylinder can be suppressed. The steam inlet (one end) penetrates the filled air A, and the steam outlet (the other end) protrudes from the outer door plate 23 and is in contact with the atmosphere.

The sealing mechanism is for sealing a gap generated between the fireproof door 2 and the frame 1 when the ambient temperature rises to a predetermined temperature due to flame heat. Hereinafter, various examples of the sealing mechanism will be described.

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 that rotatably connects the fixing plate 51 and the sealing plate 52, and an actuator 61. .

As shown in FIGS. 2 and 3, the fixing plate 51 and the sealing plate 52 are disposed along the frame body 1 on the end of the door butt side edge plate 253 on the evacuation space 102 side and the outer surface of the fireproof door 2. ing. The fixed plate 51 and the sealing plate 52 are preferably processed steel plates.

The fixing plate 51 is fixed to the fireproof door 2. The sealing plate 52 is rotatably attached to the fixed plate 51 via a hinge 53 and is further fixed to the fixed plate 51 via an actuator 61 described later.

The angle formed by the fixing plate 51 and the sealing plate 52 is preferably 90 to 100 degrees. More preferably, it is 90 ° to 95 °. Thereby, the thrust from the actuator 61 can be effectively transmitted to the sealing plate 52.

Actuators 61 are provided at a total of three locations, both ends and an intermediate portion of the fixed plate 51, and are connected to the sealing plate 52 via ball joints 58.

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

The actuator 61 includes a spring support 56, a sealing shaft 57 provided through the spring support 56, a shape memory alloy spring 54 and a bias spring 55 provided along the outer periphery of the sealing shaft 57. And a partition plate 59 that partitions the shape memory alloy spring 54 and the bias spring 55.

The spring support 56 has a groove shape when viewed in cross section, and an intermediate portion (bottom surface of the groove shape) is fixed to the fixing plate 51. A long hole (not shown) that is long in the vertical direction is formed in the rising portion of the groove mold, and a sealing shaft 57 is provided through the long hole.

One end of the sealing shaft 57 is rotatably fixed to the sealing plate 52 via a ball joint 58. The other end of the sealing shaft 57 is a free end. A partition plate 59 is fixed near the center in the longitudinal direction.

The shape memory alloy spring 54 is housed in a spring support 56, is spirally wound around the outer periphery 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 rising portion of the recess of the spring support 56, and the other end is fixed to the partition plate 59.

The bias spring 55 is housed in a spring support 56, is spirally wound around the outer periphery of the sealing shaft 57, and is provided facing the shape memory alloy spring 54 along the axial direction of the sealing shaft 57. It has been. One end of the bias spring 55 is fixed to the other rising portion of the spring support 56 groove type, and the other end is fixed to the partition plate 59.

The shape memory alloy spring 54 and the bias spring 55 are housed in the spring support 56 so as to be compressed and pressed so that the amount of displacement is constant. The bias spring 55 generates a force proportional to the displacement without being affected by the ambient temperature. On the other hand, the force generated by the ambient temperature of the shape memory alloy spring 54 changes.

FIG. 5A shows the state of the actuator 61 in the normal temperature state. In this state, the forces generated in the bias spring 55 and the shape memory alloy spring 54 are balanced.

FIG. 5B shows a state of the actuator 61 in a high temperature state. When the temperature rises and exceeds the transformation temperature, the shape memory alloy spring 54 is deformed in the extending direction to generate a tensile force, and the bias spring 55 is compressed. As a result, the sealing shaft 57 is displaced, and the sealing plate 52 pushed by the sealing shaft 57 is displaced in a direction in which the angle formed with the fixing plate 51 is increased. As a result, a gap generated between the shelter 200 and the fireproof door 2 can be sealed.

Further, when the temperature is lowered again to be equal to or lower than the transformation temperature, the tensile force generated in the shape memory alloy spring 54 is reduced and is pushed by the bias spring 55 to return to the state of FIG.

It is preferable that the transformation temperature of the shape memory alloy spring 54 is equal to or higher than a temperature at which an increase is expected due to solar heat or the like, and can detect flame heat at an early stage.

In this embodiment, the cross section of the sealing plate 52 is a simple plate shape, but it may be L-shaped in cross section. By doing so, the displacement amount of the actuator 61 to be sealed can be reduced, and the angle formed between the fixed plate 51 and the sealing plate 52 can be brought close to 90 degrees.

Sealing mechanism example 2
The sealing mechanism example 2 includes a storage container 73 having a recess and a fireproof packing 72. As shown in FIGS. 2, 3, and 6, the storage container 73 formed with the recesses is attached to the surface of the inner door plate 21 in an annular shape along the outer peripheral region. By this recess, an opening space is formed on the side opposite to the mounting surface of the inner door plate 21 (the side facing the mounting surface), that is, on the shelter 200 side. A fireproof packing 72 is housed in the recess of the housing container 73.

The fireproof packing 72 is housed in a state where the fireproof sheet is wound and is lower than the height of the concave end of the storage container 73. The refractory packing 72 expands in the direction of the opening space of the recess as the temperature rises. When the temperature rises above a predetermined temperature, the refractory packing 72 projects beyond the height of the storage container 73 and contacts the outer surface of the shelter 200. As a result, a gap generated between the fireproof door 2 and the shelter 200 can be sealed.

Refractory sheets mainly consist of aramid fibers, fluorine fibers, carbon fibers, expanded graphite fibers, polytetrafluoroethylene (PTFE) fibers, polyimide fibers, polyphenylene sulfide (PPS) fibers, etc., and woven fabric fibers And DuPont's Tyvek (registered trademark) silver sheet coated with a resin on which aluminum is deposited and the resin prevents deterioration. By using a rolled fireproof sheet as the fireproof packing 72, it becomes a structure that can expand with respect to temperature rise.

In the present embodiment, the fireproof packing 72 is held by the storage container 73 in which the recess is formed. However, the present invention is not limited to this. For example, the fireproof packing 72 is formed by a plate-like holding member. May be retained. The fireproof packing is attached to the surface of the inner door plate 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 doorway 100.

The above embodiments are examples of preferred embodiments for carrying out the present invention. The present invention is not limited to the above embodiments, and it goes without saying that various modifications are made without departing from the spirit of the invention and belong to the technical scope of the present invention.

For example, although Example 1 and Example 2 were individually listed as the sealing mechanism, these may be applied simultaneously as the sealing mechanism. Further, a watertight packing may be provided in the inner region of the fireproof packing 72 shown in the sealing mechanism example 2. Thereby, since the watertight packing is protected from the flame, the watertight performance of the fireproof door structure 10 can be improved during a tsunami and a tsunami fire.

DESCRIPTION OF SYMBOLS 1 Frame 2 Fireproof door 10 Fireproof door structure 11 Vertical frame 12 Lower frame 13 Upper frame 21 Inner door plate 22 Water filling body 23 Outer door plate 24 Space material 25 Outer edge plate 251 Lower edge plate 252 Upper edge plate 253 Door bottom side Edge plate 254 Door end side edge plate 28 Air vent valve 40 Travel device 41a, b Roller 42a, b Travel rail 43 Hanger 44a, b Rail support plate 51 Fixed plate 52 Sealing plate 53 Hinge 54 Shape memory alloy spring 55 Bias spring
56 Spring support 57 Seal shaft 58 Ball joint 59 Partition plate 61 Actuator 72 Fireproof packing 73 Storage container 100 Entrance / exit 101 External space 102 Evacuation space 200 Shelter W Filling water A Filling air

Claims

A frame provided in the shelter;
A fireproof door with a two-layer structure provided slidably on the frame;
An air vent valve,
One layer of the two-layer structure is a water-filled layer filled with water and air,
A fireproof door structure, wherein the air vent valve has one end penetrating into a space filled with air in the water-filled layer and the other end projecting into an external space.
The fireproof door structure according to claim 1, wherein the water-filled layer is divided into rows.
The fireproof door structure according to claim 1 or 2, wherein the other layer of the two-layer structure is an air layer filled with air.
A sealing mechanism is further provided that seals a gap generated between the shelter and the fire door when the fire door is closed when a predetermined temperature is reached. The fireproof door structure according to any one of the above.
The sealing mechanism includes a sealing plate rotatably fixed to the fireproof door, and an actuator having one end connected to the sealing plate and the other end fixed to the fireproof door.
The fire-resistant door structure according to claim 4, wherein the actuator displaces the sealing plate and seals the gap when a predetermined temperature is reached.
6. The fireproof door structure according to claim 5, wherein the actuator includes a shape memory alloy spring for displacing the sealing plate.
The sealing plate and the actuator are provided on the external space side of the fireproof door, and a gap formed between the frame body and the outer door plate of the fireproof door, and the outer wall of the shelter and the door butt of the fireproof door The fireproof door structure according to claim 5 or 6, wherein a gap formed between the first and second portions is sealed.
The sealing mechanism has a fireproof packing obtained by rolling a fireproof sheet,
The fireproof door structure according to claim 4, wherein the fireproof packing seals the gap by expanding when a predetermined temperature is reached.
The fireproof door structure according to claim 8, wherein the fireproof packing is held in a storage container having an open space on the opposite side of the mounting surface.
9. The fireproof packing is provided in an annular shape on an inner door plate of the fireproof door so as to face an outer peripheral portion of an entrance / exit formed in the shelter with the fireproof door closed. 9. A fireproof door structure according to 9.