Door structure

Abstract

To provide a door structure that is excellent in fire resistance efficiency and workability.SOLUTION: A door structure 501 includes: a first door 511 that is fitted in a frame 150 and opens and closes; and a second door 512 that abuts a plate surface 511b of the first door. The first door includes: a first exterior body 520 that is formed of a steel plate and steel material; a first panel member 530 that is included in the first exterior body and contains calcium silicate; a fire proof sheet 540 that covers a steel surface 520a on the side of a living room 110 of the first exterior body and forms a heat insulation layer at a predetermined temperature; and thermal foaming material 560 provided on the side end face of the first exterior body. The second door includes: a second exterior body 650 that is formed of a steel plate and steel material; and a second panel member 660 that is included in the second exterior body and contains calcium silicate. The second door is connected to the first door by a connection tool 721 inserted into the through-hole from the side of a vault 120 and inserted into the first door and a supporting tool that projects from the connection tool 721 to the side of the second panel member, the thermal foaming material being provided on the peripheral surface of the through hole.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a door structure. [Background technology]

[0002] Conventionally, safes and archives for storing documents and valuables are constructed with protective materials having fire resistance and anti-theft properties in order to protect the stored objects from fire, theft, etc. The structure and composition of the protective materials are appropriately selected so as to enhance basic performance such as fire resistance or additional performance and effects according to the installation location and purpose of the safe or archive. For example, Patent Documents 1 and 2 disclose a safe that includes a metal plate structure and a cementitious hardened body and a heat insulating material housed in the storage space of the metal plate structure, as a safe that is resistant to impacts from hammers, tools, etc. and has excellent theft prevention properties. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-227114 A [Patent Document 2] JP 2019-105099 A Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional safes and bookcases, including the safes of Patent Documents 1 and 2, are constructed with protective materials made of metals such as iron, or concrete. However, when doors and walls are formed from protective materials made of metal or concrete, the weight of the doors, frames, and walls becomes extremely large, and for example, when dismantling or reinstalling a safehouse, a jig or manpower that can accommodate heavy doors is required when transporting or installing the doors, frames, and walls, resulting in a problem of poor workability.

[0005] The present invention has been made in consideration of the above circumstances, and provides a door structure that is excellent in fire resistance and ease of installation. [Means for solving the problem]

[0006] The door structure according to the present invention comprises a first door that is fitted into a frame and can be opened and closed, and a second door that is arranged in contact with one plate surface of the first door, the first door comprising a first exterior body having a steel plate, a first panel material that is contained in the first exterior body and contains calcium silicate, a fireproof sheet portion that covers a surface of the first exterior body opposite to the surface that forms the one plate surface, and foams at a predetermined temperature to form a heat insulating layer, and a first heated foaming material that is arranged on at least a part of an end surface of the first exterior body and foams at a predetermined temperature, and the second door comprises a first exterior body having a steel plate. and a second panel material containing calcium silicate and contained within the second exterior body, a connection through hole is formed in the second door along the thickness direction, and the second door is connected to the first door by a connector that is inserted into the connection through hole from the side opposite to the side that abuts the first door in the thickness direction and has at least a tip portion inserted into the first door, and a support that protrudes from the connector toward the second panel material and supports the connector, and a second heated foaming material that foams at a predetermined temperature is arranged on the periphery of the connection through hole.

[0007] According to the above-mentioned configuration, each of the first door and the second door includes an exterior body (first exterior body, second exterior body) made of a steel plate, a panel material (first panel material, second panel material) that is contained in the exterior body and contains calcium silicate, and a fire-resistant sheet part. Therefore, each of the first door and the second door has fire resistance and fire spread prevention properties, and is lighter than conventional doors, and construction work for the door structure proceeds smoothly and efficiently.

[0008] According to the above-mentioned configuration, the first door can be constructed by disposing a fireproof sheet portion on the surface of the first panel material on the living room side, for example, so that the assembly work of the door structure before or during construction and the maintenance work of the door structure can be easily performed. In addition, the first door and the second door can be manufactured separately, for example, in a factory, and completed at the construction site as necessary. At the construction site, the first door is first fitted into the frame, and then one plate surface of the second door is abutted against one plate surface of the first door to adjust the relative positions of the first door and the second door. The connector is inserted into the connection through hole of the second door, and at least the tip of the connector is inserted into the first door from the second door side. At this time, the connector is supported by the support tool in a state where it is inserted into the first door and in a state where it is located in the connection through hole, so that the second door is attached to the first door, and the assembly of the door structure progresses easily and construction efficiency is improved. In addition, the first door and the second door can be handled separately when transporting the door structure between the construction site and the outside of the construction site, such as a factory.

[0009] In the door structure according to the present invention, the second door has a plurality of door sections stacked in the thickness direction, each of the door sections having the second exterior body and a second panel material, a connecting through hole is formed along the thickness direction in the second door section farther from the first door of two of the door sections adjacent to each other in the thickness direction, the second door section is connected to the first door section by a connecting device inserted into the connecting through hole from an opposite side to a side contacting the first door section closer to the first door of the two door sections adjacent to each other in the thickness direction and having at least a tip portion inserted into the first door section, and a support protruding from the connecting device to the second panel material of the second door section and supporting the connecting device, a third heated foaming material that foams at a predetermined temperature is arranged on a periphery of the connecting through hole, and the connecting through hole and the connecting through hole may be arranged at different positions from each other when viewed from the thickness direction.

[0010] According to the above-mentioned configuration, by stacking multiple door sections in the thickness direction of the second door, the fire resistance of the second door itself and therefore the fire resistance of the door structure are improved compared to when the second door is composed of a single door section. Also, similar to the connection between the first door and the single-layer second door, the multiple door sections constituting the second door can be manufactured individually in a factory, for example, and transported individually from the factory, and can be connected and assembled at the construction site with connectors and supports, so that the workability of the door structure is maintained high.

[0011] In the door structure according to the present invention, the fire-resistant sheet portion may be mainly composed of ammonium polyphosphate, which is a foaming component.

[0012] According to the above-mentioned configuration, a heat insulating layer is rapidly formed on the panel surface of the first exterior body facing the living space at a predetermined temperature of about 200° C. to 300° C., improving the heat resistance and fire resistance of the first door.

[0013] The door structure according to the present invention further includes an operating unit, and the operating unit is connected to an end of an axial direction of the shaft member, the shaft member being inserted into a shaft insertion through hole formed in the first door and the second door along a thickness direction of the first door and the second door, and the operating unit is connected to an end of the shaft member in an axial direction of the shaft member, and is configured to move around the axis of the shaft member. Turn and a gripping member configured to be rotatable, and a sub-heating foaming material that foams at a predetermined temperature may be arranged on each inner peripheral surface of the first panel material and the second panel material around the shaft insertion through hole.

[0014] According to the above-mentioned configuration, when a fire occurs and flames or the like penetrate into the shaft insertion through-hole, the sub-heating foaming material expands to close the gap between the first and second panel materials and the shaft member, thereby blocking the flames in the thickness direction of the first and second doors. This improves the fire resistance of the door structure.

[0015] The door structure of the present invention may further include a lock, wherein a rod-shaped member extending in the vertical direction and rising and falling in conjunction with the rotation of the shaft member about the axis is connected to the gripping member, and a connecting member that rotates in conjunction with the rising and falling of the rod-shaped member is connected to the end of the rod-shaped member opposite the end connected to the gripping member, and the lock is provided on the gripping member and the connecting member, and when the gripping member is arranged in a closed state, the lock engages with the frame, and when the gripping member is arranged in an open state, the engagement between the lock and the frame may be released.

[0016] According to the above-mentioned configuration, the gripping member, the lifting member, and the connecting member, which are components other than the shaft member of the operating unit, can be arranged outside the first door and the second door, so there is no risk of a thermal bridge being formed by the lock-related components other than the shaft insertion through hole around the shaft member when a flame occurs. As described above, when a flame occurs, the shaft insertion through hole around the shaft member is blocked by the sub-heating foaming material, so the fire resistance of the door structure is maintained.

[0017] In the door structure of the present invention, the frame may have a hollow member made of metal and one of plaster, mortar, and plaster mixed with cement filled into the hollow member.

[0018] According to the above-mentioned configuration, since the hollow of the hollow member of the frame is filled with gypsum, mortar, or the like having a high moisture content in the form of crystal water or free water, latent heat is generated by evaporation of water from the filling material, and the thermal effect of the flame reaching the frame in the event of a fire is weakened, and the temperature rise of the frame and the surrounding space is suppressed. This increases the fire resistance of the door as well as the frame on which the door is installed. Note that gypsum is more preferable than mortar as a filling material when there is a strong demand for a lightweight door structure. Effect of the Invention

[0019] According to the present invention, a lightweight door structure having excellent fire resistance and ease of installation can be provided. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a plan view of a certain floor of a building in which a door structure according to a first embodiment of the present invention is arranged. [Diagram 2] FIG. 2 is a front view of the door structure shown in FIG. 1 as seen from the living room side. [Diagram 3] FIG. 2 is a front view of the door structure shown in FIG. 1 as seen from the safe room side. [Figure 4] 3 is a cross-sectional view of the door structure shown in FIG. 2 taken along line C1-C1. [Diagram 5] 3 is a cross-sectional view of the door structure shown in FIG. 2 taken along line C2-C2. [Figure 6] 2 is an enlarged cross-sectional view of the door structure shown in FIG. 1, seen from a direction D1. [Figure 7] 2 is an enlarged cross-sectional view of a part of the door structure shown in FIG. 1, seen from a direction D3. FIG. [Figure 8] 1. FIG. 4 is an enlarged cross-sectional view of another part of the door structure shown in FIG. [Figure 9] 10 is a cross-sectional view of the door structure according to the second embodiment of the present invention, taken along line C1-C1 in FIG. 2. [Figure 10] 2. FIG. 4 is a cross-sectional view of the door structure according to the second embodiment of the present invention, taken along the line C2-C2 in FIG. [Figure 11] 11 is an enlarged cross-sectional view of the door structure shown in FIGS. 9 and 10, seen from a direction D1. FIG. [Figure 12] 11 is an enlarged cross-sectional view of a part of the door structure shown in FIGS. 9 and 10, seen from a direction D3. FIG. [Figure 13] 11 is an enlarged cross-sectional view of another part of the door structure shown in FIGS. 9 and 10, viewed from the D3 direction. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0022] (First embodiment) First, a door structure 501 according to a first embodiment of the present invention will be described with reference to Fig. 1 to Fig. 8. As shown in Fig. 1 to Fig. 5, the door structure 501 according to the first embodiment is disposed in a partition wall 130 that separates a room 110 and a safe room 120 in a predetermined floor of a building B. The door structure 501 is fitted into a frame 150 provided in the partition wall 130 and can be opened and closed. In Fig. 1, structures of the building B other than the wall 140 surrounding the room 110 and the safe room 120, the partition wall 130, and the frame 150 are omitted.

[0023] The partition wall 130 includes a core material such as a light steel frame, and a wall material connected to the core material and provided on the outer surface of the core material. The configuration of the partition wall 130 is preferably easy to work with during construction and dismantling, and is lighter than conventional walls made of concrete, but is not particularly limited thereto.

[0024] The door structure 501 includes a first door 511 arranged on the living room 110 side, a second door 512 arranged on the safe room 120 side, an operating unit 570, and a sealing material 770. The first door 511 and the second door 512 are fitted into a frame 150. In the following description, unless otherwise specified, each component of the door structure 501 in a closed state relative to the frame 150 will be described.

[0025] As shown in Fig. 4, the frame 150 includes a hollow member 152 and a filler 154 filled in the hollow of the hollow member 152. The hollow member 152 is made of metal, such as iron or steel (carbon steel, alloy steel (stainless steel, etc.)) that does not melt even at high temperatures of about 1000°C. The filler 154 is gypsum or mortar, which is non-flammable and has a constantly stable moisture content, or gypsum mixed with cement. When there is a strong demand for a lightweight door structure, it is preferable that the filler 154 be gypsum or gypsum mixed with cement rather than mortar.

[0026] As shown in Figures 4 and 5, a plurality of steam vent holes 157 are formed at appropriate positions of the frame 150. With this, when the frame 150 is exposed to a high temperature of, for example, 100°C or higher in the event of a fire, the water of crystallization or free water contained in the filler 154 filled in the hollow member 152 of the frame 150 evaporates and the generated water vapor is efficiently and smoothly discharged to the outside of the frame 150. Without a water vapor escape route such as the steam vent holes 157, the water vapor pressure in the hollow member 152 increases, and there is a risk of damaging the hollow member 152. The diameter of the steam vent hole 157 is, for example, about 10 mm, but is not limited to a specific value as long as the water vapor generated inside the hollow member 152 of the frame 150 can be discharged as described above.

[0027] The first door 511 has a first exterior body 520, a first panel material 530, a fireproof sheet part 540, and a heat foaming material (first heat foaming material) 560. The first exterior body 520 includes a thin steel plate 521 arranged on the living room 110 side in the D2 direction, a thin steel plate 522 arranged on the safe room 120 side of the steel plate 521, and a reinforcing material 528 connecting the steel plates 521 and 522 to each other in the D2 direction. The D2 direction is parallel to the depth direction of the door structure 501 and is a direction from the living room 110 toward the safe room 120. The first exterior body 520 constitutes a formwork in the first door 511. The size of each of the steel plates 521 and 522 in the D3 direction, that is, the thickness of the steel plates 521 and 522, is, for example, about 1.6 mm.

[0028] When viewed from the front along the D2 direction, the steel plate 522 is formed to be slightly larger than the steel plate 521. When viewed from the front along the D2 direction, the upper end of the steel plate 522 protrudes upward from the upper end of the steel plate 521, that is, parallel to and in the opposite direction to the D3 direction. Furthermore, when viewed from the front along the D2 direction, the left and right side ends and the lower end of the steel plate 522 each substantially overlap the left and right side ends and the lower end of the steel plate 521, respectively.

[0029] The two steel plates 521, 522 are integrated by a reinforcing member 528 arranged at an interval along the peripheral end when viewed from the D2 direction. The reinforcing member 528 is arranged as a framework of the first exterior body 520, thereby forming a hollow steel first exterior body 520. The reinforcing member 528 includes steel members 523-526.

[0030] The first panel material 530 is contained in the first exterior body 520 and is provided between the steel plates 521, 522 in the D2 direction. The first panel material 530 is composed of a calcium silicate board 532 having a predetermined thickness. The thickness of the calcium silicate board 532 is, for example, 50 mm when the temperature of the safe room 120 is assumed to be 177°C or less based on the standard of JIS S 1037 "fireproof safe". The thickness of the calcium silicate board 532 is preferably 100 mm or less. Examples of the calcium silicate board 532 include a "calcium silicate board" which is a fiber reinforced cement board conforming to JIS A 5430, and a commercially available calcium silicate board (manufactured by Nippon Insulation Co., Ltd., etc.).

[0031] As shown in FIG. 4, the steel material 523 connects the upper ends of the steel plates 521 and 522 in the D2 direction. The steel material 523 has a first portion 611, a second portion 612, and a third portion 613. The steel material 523 is formed to draw a substantially S-shape when viewed from the D1 direction parallel to the width direction of the door structure 501. The first portion 611 extends parallel to the D2 direction between the steel plates 521 and 522. The second portion 612 protrudes from the end of the first portion 611 on the living room 110 side in the D2 direction in the D3 direction parallel to the vertical direction and in the same direction. The second portion 612 is fixed to the upper end of the steel plate 521 from the safe room 120 side by adhesive or welding. The third portion 613 protrudes from the end of the first portion 611 on the safe room 120 side in the D2 direction in the opposite direction to the D3 direction. The third portion 613 is fixed to the upper end of the steel plate 522 from the living room 110 side by adhesive, welding, or the like.

[0032] The steel material 524 connects the lower ends of the steel plates 521 and 522 in the D2 direction. The steel material 524 has a first portion 615, a second portion 616, and a third portion 617. The steel material 524 is formed to be substantially U-shaped when viewed from the D1 direction. The first portion 615 extends parallel to the D2 direction between the steel plates 521 and 522. The second portion 616 protrudes in the D3 direction from the end of the first portion 615 on the living room 110 side in the D2 direction, and is fixed to the lower end of the steel plate 521 from the safe room 120 side by adhesive or welding. The third portion 617 protrudes in the D3 direction from the end of the first portion 615 on the safe room 120 side in the D2 direction, and is fixed to the lower end of the steel plate 522 from the living room 110 side by adhesive or welding.

[0033] As shown in Fig. 5, the steel material 525 connects the right end portions of the steel plates 521 and 522 in the D2 direction when viewed along the D2 direction. The steel material 525 has a first portion 621, a second portion 622, and a third portion 623, and is formed to have a substantially U-shaped shape when viewed from the D3 direction. The first portion 621 extends parallel to the D2 direction between the steel plates 521 and 522. The second portion 622 protrudes from the end of the first portion 621 on the living room 110 side in the D2 direction in a direction opposite to and parallel to the D1 direction, and is fixed to the right end portion of the steel plate 521 from the safe room 120 side by adhesive or welding, etc. The third part 623 protrudes parallel to and in the opposite direction to the D1 direction from the end of the first part 621 on the safe room 120 side in the D2 direction, and is fixed to the right end part of the steel plate 522 from the room 110 side by adhesive or welding, etc.

[0034] The steel material 526 connects the left ends of the steel plates 521 and 522 in the D2 direction when viewed along the D2 direction. The steel material 526 has a first portion 625, a second portion 626, and a third portion 627, and is formed to be substantially U-shaped when viewed from the D3 direction. The first portion 625 extends parallel to the D2 direction between the steel plates 521 and 522. The second portion 626 protrudes in the D1 direction from the end of the first portion 625 on the living room 110 side in the D2 direction, and is fixed to the left end of the steel plate 521 from the safe room 120 side by adhesive or welding. The third portion 627 protrudes in the D1 direction from the end of the first portion 625 on the safe room 120 side in the D2 direction. The third portion 627 is fixed to the left end of the steel plate 522 from the living room 110 side by adhesive or welding.

[0035] As shown in FIG. 4, the fireproof sheet portion 540 covers the steel plate surface (plate surface) 520a facing the living room 110 side of the first exterior body 520 and the upper surface of the first part 611 of the steel material 523. The fireproof sheet portion 540 only needs to cover the steel plate surface 520a facing the living room 110 side, which is likely to be the source of a fire or the like. However, since high temperature air is more likely to rise than low temperature air, if the fireproof sheet portion 540 is arranged only on the steel plate surface 520a, there is a risk that the fireproof sheet portion 540 will peel off from the peripheral portion, particularly the upper edge portion, of the steel plate surface 520a in the event of a fire or the like. In order to reliably prevent the upper edge portion of the steel plate surface 520a from peeling off in the event of a fire, the fireproof sheet portion 540 extends continuously from the steel plate surface 520a to the upper surface of the first part 611. The fireproof sheet portion 540 is fixed to the upper end portion of the first panel material 530 by screws 562 together with a heat-foaming material 560 described later.

[0036] The fireproof sheet part 540 includes one or more dry fireproof sheets 542, and is configured as a laminate in which one dry fireproof sheet 542 or two or more dry fireproof sheets 542 are laminated in the thickness direction. Examples of the dry fireproof sheet 542 include a commercially available dry fireproof sheet and SK Taica sheet (manufactured by SK Chemical Co., Ltd.). In the above-mentioned SK Taica sheet, the foaming component contained therein starts foaming at about 200°C to 300°C to form a heat insulating layer. The dry fireproof sheet 542 is mainly composed of ammonium polyphosphate, and is, for example, a foaming acrylic resin sheet mixed with ammonium polyphosphate, but is not particularly limited as long as it forms a heat insulating layer at a predetermined temperature (about 200°C to 300°C).

[0037] The number of dry fireproof sheets 542 constituting the fireproof sheet portion 540 is appropriately set according to the fireproof performance required for the door structure 501, taking into account the fireproof performance of the dry fireproof sheet 542 and the thickness of the calcium silicate board 532 constituting the first panel material 530. For example, SK Taica sheet (thickness of one sheet: 1.5 mm) is used as the dry fireproof sheet 542, calcium silicate board 532 with a thickness of 50 mm is used as the first panel material 530, and the temperature on the safe room 120 side is assumed to be 177°C or less based on JIS S 1037 "Fireproof safe". In this case, the thickness of the fireproof sheet portion 540 provided on the steel plate surface 520a of the first exterior body 520 before foaming can be set to 6 mm. Therefore, in the above-mentioned assumption, four SK Taica sheets can be laminated. In Figs. 4 and 5, a fireproof sheet portion 540 composed of four dry fireproof sheets 542 is illustrated. The dry fire-resistant sheets 542 are bonded together in the thickness direction with an adhesive having fire resistance at or above a predetermined temperature.

[0038] A long side edge 634 of an L-shaped metal fitting 630 with a chamfered periphery is disposed on the outer periphery of the surface of the fire-resistant sheet portion 540 facing the living room 110. The L-shaped metal fitting 630 is formed of, for example, stainless steel (SUS).

[0039] The first panel material 530 may be composed of two or more panel materials (not shown) like the fire-resistant sheet portion 540. The thicknesses of the first panel material 530 and the fire-resistant sheet portion 540 are appropriately set according to the fire resistance performance required for the first door 511. As described above, the thickness of the fire-resistant sheet portion 540 is changeable and adjustable depending on the number of dry fire-resistant sheets 542 to be laminated. The thickness of the first panel material 530 may also be changeable and adjustable depending on the number of panel materials to be laminated.

[0040] When viewed along the D2 direction, the left and right side ends and the lower end of the fireproof sheet part 540 are accommodated in the inner corners of the L-shaped metal fitting 630. The L-shaped metal fitting 630 has a long side part 631, a short side part 632, and a long side edge part 634. The long side part 631 is fixed to the peripheral part of the plate surface 521a facing the room 110 of the steel plate 521 constituting the steel plate surface 520a of the first exterior body 520 from the room 110 side by a screw or the like (not shown). The short side part 632 protrudes from the end of the long side part 631 closer to the peripheral edge of the plate surface 521a in the opposite direction to the D2 direction. In other words, the short side part 632 is connected to the long side part 631 at approximately 90°, and forms an L shape as a whole. The left and right side ends and the bottom end of the fire-resistant sheet portion 540 are adhered to the long side portion 631 and the short side portion 632 with a heat-resistant adhesive or the like. The long side edge portion 634 protrudes from the end of the short side portion 632 on the near side in the D2 direction in a direction parallel to and opposite to the D2 direction.

[0041] As shown in FIG. 4 and FIG. 5, the heat foaming material 560 is disposed on the outside (i.e., the side opposite to the side in contact with the first member 611) of the fireproof sheet part 540 that covers the first member 611 of the steel material 523 from the outside (i.e., the side opposite to the side in contact with the first panel material 530). As described above, the heat foaming material 560 is fixed to the upper end of the first panel material 530 by the screws 562, sandwiching the fireproof sheet 540 and the first member 611 of the steel material 523. The heat foaming material 560 is also disposed on the outer surfaces of each of the first members 615, 621, 625 of the steel materials 524 to 526. The heat foaming material 560 provided on the first members 615, 621, 625 is fixed to the lower end, right end, and left end of the first panel material 530 together with the first members 615, 621, 625 by the screws 562.

[0042] The heated foaming material 560 is disposed over substantially the entire peripheral end surface of the first panel material 530 in the D2 direction. At least the end of the heated foaming material 560 on the fireproof sheet portion 540 on the room 110 side substantially overlaps with the second member 612 in the D2 direction. The end of the heated foaming material 560 on the room 110 side on the first members 615, 621, 625 contacts the second members 616, 622, 626 from the vault 120 side. This configuration reliably prevents the progress of the flame from extending from the room 110 to the vault 120. In addition, from the viewpoint of preventing the progress of the flame as described above, it is preferable that the heated foaming material 560 is disposed at least in the room 110 side portion of the first panel material 530 from the center in the D2 direction.

[0043] When the gap 160 between the frame 150 and the heating foaming material 560 reaches a predetermined temperature (about 200°C) or higher, the heating foaming material 560 foams to close the gap 160. Examples of the heating foaming material 560 include known fire-resistant heating foaming materials, thermally expandable fireproof materials, and commercially available FiBlock (manufactured by Sekisui Chemical Co., Ltd.). The type and material of the heating foaming material 560 are not particularly limited as long as it can close the gap 160 as described above at a temperature of about 200°C. For example, commercially available FiBlock expands only in the D1 direction or in a direction parallel to and opposite to the D1 direction in a high-temperature environment of 200°C or higher. As a result, when a flame occurs in the living room 110, the heating foaming material 560 effectively closes the gap 160 along a surface including the D1 direction and the D3 direction, and no extra pressure is generated in the D2 direction on the first panel material 530.

[0044] As shown in Fig. 2 and Fig. 5, the door structure 501 is attached to the frame 150 so as to be openable and closable, and opens from a closed state in the opening of the frame 150 to the room 110 side. Specifically, when viewed along the D2 direction, the right side of the first door 511 is connected to the frame 150 facing in the D1 direction by a hinge 518 protruding toward the room 110 side. As illustrated in Fig. 2, the first door 511 is connected to the frame 150 by three hinges 518 arranged at intervals from each other in the D3 direction. In a natural state in which no fire or the like has occurred in the room 110 and the safe room 120, a gap 160 is generated between the door structure 501 in the closed state and the frame 150.

[0045] 3 to 5, the second door 512 is disposed in contact with a plate surface (one plate surface) 511b of the first door 511 facing the safe room 120 in the D2 direction. The second door 512 includes a second exterior body 650, a second panel material 660, and at least a connector 721 and a support 722. In the door structure 501, the fire resistance performance required for the second door 112 is lower than that of the first door 511, and therefore the second door 112 does not include a fireproof sheet portion.

[0046] Second exterior body 650 includes steel plates 651, 652 and a reinforcing material 670, and constitutes a formwork for second door 512. When viewed from direction D2, each of steel plates 651, 652 has a thickness of, for example, about 1.6 mm, similar to steel plates 521, 522.

[0047] The second panel material 660 is enclosed in the second exterior body 650 and is provided between the steel plates 651, 652 in the D2 direction. The second panel material 660 is composed of a calcium silicate board 662 having a predetermined thickness. The thickness of the calcium silicate board 662 is, for example, 40 mm, and is preferably 100 mm or less. When the thickness of one calcium silicate board 662 is thinner than the predetermined thickness required for the second panel material 660, a laminate in which two or more calcium silicate boards 24 are laminated in the thickness direction may be used as the second panel material 622, similar to the first panel material 530.

[0048] As shown in FIG. 4 and FIG. 5, in the upper part of the frame 150, the part in which the second door 512 is fitted protrudes downward from the part in which the first door 511 is fitted. In the left part of the frame 150, the part in which the second door 512 is fitted protrudes to the right from the part in which the first door 511 is fitted. In the right part of the frame 150, the part in which the second door 512 is fitted protrudes to the left from the part in which the first door 511 is fitted. Therefore, when viewed from the D2 direction, the upper end of the second door 512 is located lower than the upper end of the first door 511. The left end and the right end of the second door 512 are located to the right and the left of the left end and the right end of the first door 511. Similarly, when viewed from the D2 direction, the lower end of the second door 512 approximately overlaps with the lower end of the first door 511.

[0049] The reinforcing member 670 includes steel members 672 to 677. As shown in FIG. 4, the steel member 672 connects the upper ends of the steel plates 651 and 652 in the D2 direction. The steel member 672 includes a first portion 681, a second portion 682, and a third portion 683. The steel member 672 is formed to form a U-shape when viewed from the D1 direction. The first portion 681 extends parallel to the D2 direction between the steel plates 651 and 652. The second portion 682 protrudes from the end of the first portion 681 on the living room 110 side in the D2 direction in a direction opposite to the D3 direction. The second portion 682 is fixed to the upper end of the steel plate 651 from the safe room 120 side by adhesive, welding, or the like. The third portion 683 protrudes in a direction parallel to and opposite to the D3 direction from the end of the first portion 681 on the safe room 120 side in the D2 direction. The third portion 683 is fixed to the upper end of the steel plate 652 from the living room 110 side by adhesive, welding, or the like.

[0050] As shown in FIG. 4, the steel material 673 connects the lower ends of the steel plates 651 and 652 in the D2 direction. The steel material 673 has a first portion 685, a second portion 686, a third portion 687, and a fourth portion 688. The first portion 685 extends parallel to the D2 direction from a predetermined position on the plate surface of the lower end of the steel plate 651 on the vault 120 side. The second portion 686 protrudes parallel to and in the opposite direction to the D3 direction from the end of the first portion 685 on the vault 120 side in the D2 direction, and then extends in the D2 direction, forming a substantially inverted L-shape as viewed from the D1 direction. The third portion 687 protrudes in the D3 direction from the end of the first portion 685 on the room 110 side in the D2 direction, and is fixed to the lower end of the steel plate 651 from the vault 120 side by adhesive or welding, etc. The fourth portion 688 protrudes in the D3 direction from the end of the second portion 686 on the vault 120 side in the D2 direction. The fourth portion 688 is fixed to the lower end of the steel plate 652 from the living room 110 side by adhesive, welding, or the like.

[0051] The steel materials 674 and 675 protrude from the vault 120 side plate surface of the lower end of the steel plate 652. The steel material 674 has a first portion 691, a second portion 692, a third portion 693, and a fourth portion 694. The first portion 691 extends parallel to the D2 direction from a predetermined position on the vault 120 side plate surface of the lower end of the steel plate 652. The second portion 692 protrudes from the end of the first portion 691 on the vault 120 side in the D2 direction in a direction parallel to and opposite to the D3 direction, and then extends in the D2 direction, and is formed into a substantially inverted L shape as viewed from the D1 direction. The third portion 693 protrudes from the end of the first portion 691 on the room 110 side in the D2 direction in a direction parallel to and opposite to the D3 direction, and is fixed to the lower end of the steel plate 652 from the vault 120 side by adhesive, welding, or the like. The fourth portion 694 protrudes in the D3 direction from the end of the second portion 686 on the safe room 120 side in the D2 direction.

[0052] The steel material 675 has a first portion 695, a second portion 696, and a third portion 697. The first portion 695 extends parallel to the D2 direction from a predetermined position on the plate surface of the lower part of the steel plate 652 on the vault 120 side above the second portion 692 of the steel material 673. The length of the first portion 695 in the D2 direction is approximately equal to the total length of the first portion 691 and the second portion 692. The second portion 696 protrudes in the opposite direction to the D3 direction from the end of the first portion 695 on the living room 110 side in the D2 direction, and is fixed to the lower end of the steel plate 652 from the vault 120 side by adhesive or welding or the like. The third portion 697 protrudes in the D3 direction from the end of the second portion 686 on the vault 120 side in the D2 direction, and is fixed to the fourth portion 694 of the steel material 673 from the vault 120 side by adhesive or welding or the like.

[0053] The heated foam material 666 is provided on the entire surface of the first member 681 of the steel material 672 opposite to the side in contact with the second panel material 660, and on the entire surface of the first portion 685 of the steel material 673 opposite to the side in contact with the second panel material 660. The heated foam material 666 is fixed to the upper end and lower end of the second panel material 660 by screws 668, sandwiching the first portions 681 and 685. Although the heated foam material 666 is provided over the entire first member 681 of the steel material 672 in the D2 direction, it is preferable that the heated foam material 666 is provided at least behind the center of the first member 681 in the D2 direction, that is, on the living room 110 side. This configuration reliably prevents the progression of the flame from extending from the living room 110 to the safe room 120. Like the heated foaming material 560, the heated foaming material 666 foams so as to close the gap 160 between the frame 150 and the heated foaming material 666 when the gap 160 between the frame 150 and the heated foaming material 666 reaches a predetermined temperature (about 200° C.) or higher. As the heated foaming material 666, the same material as the heated foaming material 560 or a commercially available FiBlock can be used.

[0054] The lower part of the frame 150 is accommodated in the floor 105 of the living room 110 and the safe room 120. The upper end surface of the lower part of the frame 150 is disposed at approximately the same height as the floor surface and is exposed from the floor 105. A first locking part 701 is provided between the second part 686 of the steel material 673 and the lower part of the frame 150. A second locking part 702 is provided between the second part 692 of the steel material 674 and the lower part of the frame 150. The first locking part 701 and the second locking part 702 are provided with a metal mechanism called a so-called door bottom, and when the door structure 501 is closed to the frame 150, they automatically lower below the lower end of the second door 512 in the D3 direction, closing the gap with the floor 105.

[0055] As shown in FIG. 5, the steel material 676 connects the right ends of the steel plates 651 and 652 in the D2 direction when viewed along the D2 direction. The steel material 676 has a first portion 711, a second portion 712, and a third portion 713, and is formed to be substantially U-shaped when viewed from the D3 direction. The first portion 711 extends parallel to the D2 direction between the steel plates 611 and 612. The second portion 712 protrudes in the D1 direction from the end of the first portion 711 on the living room 110 side in the D2 direction, and is fixed to the right end of the steel plate 651 from the safe room 120 side by adhesive or welding. The third portion 713 protrudes in the D1 direction from the end of the first portion 711 on the safe room 120 side in the D2 direction, and is fixed to the right end of the steel plate 652 from the living room 110 side by adhesive or welding.

[0056] The steel material 677 connects the left ends of the steel plates 651 and 652 in the D2 direction when viewed along the D2 direction. The steel material 677 has a first portion 715, a second portion 716, and a third portion 717, and is formed to be substantially U-shaped when viewed from the D3 direction. The first portion 715 extends parallel to the D2 direction between the steel plates 611 and 612. The second portion 716 protrudes parallel to and in the opposite direction to the D1 direction from the end of the first portion 715 on the living room 110 side in the D2 direction, and is fixed to the left end of the steel plate 651 from the safe room 120 side by adhesive or welding, etc. The third portion 717 protrudes parallel to and in the opposite direction to the D1 direction from the end of the first portion 715 on the safe room 120 side in the D2 direction, and is fixed to the left end of the steel plate 652 from the living room 110 side by adhesive or welding, etc. As described above, the door structure 501 is provided with the first locking portion 701 and the second locking portion 702, so that the second portions 712, 716 and the third portions 713, 717 of the steel members 676, 677 do not protrude from the second panel material 660 in the D1 direction, and the left and right side ends of the second door 512 are flattened when viewed from the D2 direction.

[0057] In door structure 501, in order to prevent the above-mentioned steel materials from becoming thermal bridges in the event of a fire, for example, as shown in Figure 5, steel materials 523-526 and steel materials 672-677 are arranged at different positions from each other in the D1 direction or the D3 direction, and are not arranged in a straight line along the D2 direction.

[0058] The first door 511 and the second door 512 are connected by a connector 721 and a support 722. As shown in Figs. 2 and 3, a plurality of through holes (connection through holes) 720 are formed at appropriate intervals in the circumferential direction on the outer periphery of the second door 512 when viewed along the D2 direction. As shown in Figs. 4 to 6, each of the through holes 720 is formed along the D2 direction. A metal guide pipe 730 is disposed on the inner circumferential surface 660s of the second panel material 660 that constitutes the circumferential surface of the through hole 720. The shapes of the through hole 720 and the guide pipe 730 when viewed along the D2 direction are rectangular.

[0059] A bolt 723 is inserted as a connector 721 into the through hole 720 with its axis direction parallel to the D2 direction. A guide material 735 and a guide plate 736 are provided on the steel plate 522 facing the inside of the through hole 720 from the safe room 120 side. At least the tip of a threaded shaft portion 726 of the bolt 723 penetrates the guide material 735, the guide plate 736 and the steel plate 522 of the first door 511 from the side opposite to the side where the second door 512 abuts against the first door 511 in the D2 direction, i.e., from the safe room 120 side, and is inserted into the first panel material 530.

[0060] The bolt 723 is provided with flange plates 724 and 725 as supports 722, which protrude toward the second panel material 660 in the through hole 720. The flange plates 724 and 725 are inserted in sequence through the shaft portion 726 so as to contact the head 727 of the bolt 723 from the room 110 side in the D2 direction. The flange plates 724 and 725 protrude toward the second panel material 660, that is, radially outward from the axis of the bolt 723, in a plane including the D3 direction. The flange plate 724 is inserted into the second panel material 660 through the guide pipe 730 from the through hole 720. The flange plate 725 is engaged with the inner peripheral surface 730s of the guide pipe 730. The flange plates 724 and 725 are formed of, for example, steel.

[0061] A reinforcing member 738 that protrudes radially outward from the guide pipe 730 is embedded in the second panel material 660 near the end of the guide pipe 730 on the vault 120 side. The reinforcing member 738 is made of a metal such as SUS.

[0062] A heat foaming material (second heat foaming material) 733 that foams at a predetermined temperature is provided on an inner peripheral surface 730s exposed to the hollow portion of the guide pipe 730. As with the heat foaming material 560, the heat foaming material 733 may be, for example, a known fire-resistant heat foaming material, a thermally expandable fireproof material, or a commercially available FiBlock (manufactured by Sekisui Chemical Co., Ltd.).

[0063] The end of the guide pipe 730 on the vault 120 side, i.e., the opening of the guide pipe 730 on the vault 120 side and the portion of the steel plate 652 adjacent to said end, are covered from the vault 120 side by a cover plate 740. The cover plate 740 is formed of, for example, a steel material. The cover plate 740 covering the portion of the steel plate 652 adjacent to the end of the guide pipe 730 on the vault 120 side is fixed to the steel plate 652, the reinforcing material 738, and the second panel material 660 from the vault 120 side by screws or the like shown by dashed lines in Fig. 6.

[0064] As shown in FIG. 2, FIG. 3, and FIG. 7, the operating unit 570 includes a shaft portion 571, a grip portion 572 on the living room 110 side, a grip portion 573 on the safe room 120 side, a lifting member 574, a main lock 575, and a sub-lock (lock) 576. A through hole (through hole for shaft insertion) 578 is formed along the D2 direction at the same position as each other and suitable for a user to grip when opening and closing the door structure 501 when viewed from the D2 direction of the first door 511 and the second door 512. The shaft portion 571 includes a shaft member 580 and cover members 581, 582. The shaft member 580 is a cylindrical member having a diameter smaller than the inner diameter of the through hole 578, and is disposed in the through hole 578. A locking member having a larger diameter than the shaft member 580 is provided at both ends of the shaft member 580 in the D2 direction.

[0065] A steel material 531 is provided on an inner circumferential surface 530s of the first panel material 530 around the through hole 578. The steel material 531 has a first portion 539 in contact with the inner circumferential surface 530s, and a second portion 533 protruding outward in a radial direction centered on the axis of the shaft member 580 from both ends of the first portion 539 in the D2 direction. A heat-foamed material (sub-heat-foamed material) 534 is provided on the inner circumferential surface of the first portion 539 on the side opposite to the first panel material 530 side.

[0066] A steel material 535 is provided on an inner circumferential surface 660s of the second panel material 660 around the through hole 578. The steel material 535 has a first portion 536 in contact with the inner circumferential surface 530s, and a second portion 537 protruding outward in a radial direction centered on the axis of the shaft member 580 from both ends of the first portion 536 in the D2 direction. A heat-foaming material (sub-heat-foaming material) 538 is provided on the inner circumferential surface of the first portion 536 on the side opposite to the second panel material 660 side.

[0067] When the temperature inside the through hole 578 reaches about 200°C, the heat foaming materials 534, 538 foam so as to be able to close the space between the first panel material 530 or the second panel material 660 and the shaft member 580. For each of the heat foaming materials 534, 538, for example, a known fire-resistant heat foaming material, a thermal expansion fireproof material, a commercially available Fi-Block (manufactured by Sekisui Chemical Co., Ltd.), etc. can be applied. When a commercially available Fi-Block is used as the heat foaming materials 534, 538, it is preferable that, for example, two sheets of Fi-Block are laminated and placed on the inner circumferential surfaces of the first parts 536, 539. Note that the type of the heat foaming materials 534, 538 is not particularly limited as long as it is possible to close the space between the shaft member 580 as described above at a temperature of about 200°C, and may be different from the heat foaming material 560. By providing the heating foam materials 534, 538, in the event of a fire occurring in the living room 110, the flame is prevented from progressing through the through hole 578 toward the vault 120.

[0068] The cover member 581 is connected to the end of the shaft member 580 on the side of the room 110 in the D2 direction via a locking member from the side of the room 110. The cover member 581 covers the fireproof sheet portion 540 located radially outward from the locking member that contacts the end of the shaft member 580 on the side of the room 110, from the side of the room 110. The cover member 582 is connected to the end of the shaft member 580 on the side of the safe 120 in the D2 direction via a locking member from the side of the safe 120. The cover member 582 covers the steel plate 652 located radially outward from the locking member that contacts the end of the shaft member 580 on the side of the safe 120, from the side of the safe. The shaft member 580 and the cover members 581 and 582 are formed of, for example, SUS.

[0069] The gripping portion 572 includes a rotating shaft member 583 that protrudes from the cover member 581 in a direction parallel to and opposite to the D2 direction, a gripping member 584 connected to a tip end portion of the rotating shaft member 583 on the front side in the D2 direction, and a knob 585. The gripping member 584 protrudes from the tip end portion of the rotating shaft member 583 radially outwardly with the axial direction of the rotating shaft member 583 as the center. As shown in FIG. 2, the knob 585 is a rod-shaped member. The knob 585 is attached to a predetermined position on the periphery of the gripping member 584 so that the axial direction of the knob 585 is along the radial direction with the axial direction of the rotating shaft member 583 as the center when viewed from the D2 direction.

[0070] As shown in Fig. 3 and Fig. 7, the gripping portion 573 includes a rotating shaft member 586 that protrudes from the cover member 582 in a direction parallel to and opposite to the D2 direction, a gripping member 587 connected to a tip end portion of the rotating shaft member 586 on the far side in the D2 direction, and a knob 588. The gripping member 587 protrudes from the tip end portion of the rotating shaft member 586 radially outward with the axial direction of the rotating shaft member 586 as the center. As shown in Fig. 3, the knob 588 is a rod-shaped member. The knob 588 is attached to a predetermined position on the periphery of the gripping member 587 so that the axial direction of the knob 588 is along the radial direction with the axial direction of the rotating shaft member 586 as the center when viewed from the D2 direction.

[0071] 3 and 7, the lifting member 574 is disposed so as to be exposed on the safe room 120 side of the second door 512. The lifting member 574 includes rod-shaped members 598-1, 598-2, 598-3, a coupling member 589, and a connection member 590. Each of the rod-shaped members 598-1 to 598-3 extends parallel to the d3 direction, and moves up and down in conjunction with the rotation of the gripping member 587 transmitted from the knob 588. When each of the rod-shaped members 598-1 to 598-3 moves up and down in conjunction with the rotation of the gripping member 587 as described above, the position of each of the rod-shaped members 598-1 to 598-3 in the D1 direction does not change.

[0072] Rod-shaped members 598-1, 598-2 are disposed on both sides of rotating shaft member 586 of gripping portion 573 in the D1 direction. The end portions on the far side in the D3 direction of each of rod-shaped members 598-1, 598-2, i.e., the lower ends, are connected to gripping member 587 of gripping portion 573 from the living room 110 side in the D2 direction. The end portions on the near side in the D3 direction of each of rod-shaped members 598-1, 598-2, i.e., the upper ends, are connected by connecting member 589 that is rotatable around the D2 direction. Connecting member 589 is disposed so as to overlap with the upper left end portion of second door 512 when viewed along the D2 direction.

[0073] An upper end of rod-shaped member 598-3 is connected to gripping member 587 at a position approximately where rod-shaped member 598-1 is connected in the D1 direction and lower than the position where the lower end of rod-shaped member 598-1 is connected in the D3 direction. A lower end of rod-shaped member 598-3 is connected to connecting member 590 that is rotatable around the D2 direction. Connecting member 590 is disposed so as to overlap with the lower left end of second door 512 when viewed along the D2 direction.

[0074] 3 and 8, when viewed from the D2 direction of the first door 511 and the second door 512, a through hole 680 is formed at a position on the front side of the through hole 578 in the D3 direction, i.e., at a position above the through hole 578. The lock 575 includes an axis member 591, cover members 592 and 593, and a knob member 594. The axis member 591 is a cylindrical member having a diameter smaller than the inner diameter of the through hole 680, and is disposed within the through hole 680.

[0075] A steel material 751 is provided on an inner circumferential surface 530t of the first panel material 530 around the through hole 680. The steel material 751 has a first portion 752 in contact with the inner circumferential surface 530t, and a second portion 753 that protrudes outward in a radial direction centered on the axis of the shaft member 591 from both ends of the first portion 752 in the D2 direction. A heat-foaming material 754 is provided on the inner circumferential surface of the first portion 752 on the side opposite to the first panel material 530 side.

[0076] A steel material 755 is provided on an inner circumferential surface 660t of the second panel material 660 around the through hole 680. The steel material 755 has a first portion 756 in contact with the inner circumferential surface 660s, and a second portion 757 protruding outward in a radial direction centered on the axis of the shaft member 580 from both ends of the first portion 756 in the D2 direction. A heat-foamed material 758 is provided on the inner circumferential surface of the first portion 756 on the side opposite to the second panel material 660 side.

[0077] When the temperature inside the through hole 680 reaches about 200°C, the heat foaming materials 754 and 758 foam so as to be able to close the space between the first panel material 530 or the second panel material 660 and the shaft member 591. For each of the heat foaming materials 754 and 758, for example, a known fire-resistant heat foaming material, a thermal expansion fireproof material, a commercially available Fi-Block (manufactured by Sekisui Chemical Co., Ltd.), etc. can be applied. When a commercially available Fi-Block is used as the heat foaming materials 754 and 758, it is preferable that, for example, two sheets of Fi-Block are laminated and placed on the inner circumferential surfaces of the first parts 752 and 756. Note that, as long as the space between the shaft member 591 can be closed as described above at a temperature of about 200°C, the type of the heat foaming materials 754 and 758 is not particularly limited, and may be different from the heat foaming materials 534, 538, 560, etc. By providing the heating foam materials 754, 758, in the event of a fire occurring in the living room 110, the flame is prevented from progressing through the through hole 680 toward the vault 120.

[0078] The cover member 592 is connected to the end of the shaft member 591 on the room 110 side in the D2 direction from the room 110 side. The cover member 592 covers the fireproof sheet portion 540 located radially outward from the end of the shaft member 591 on the room 110 side, centered on the axis of the shaft member 591, from the room 110 side. At least a part of the cover member 592 is embedded in a metal plate 544 located radially outward from the end of the shaft member 591 on the room 110 side, centered on the axis of the shaft member 591.

[0079] The cover member 593 is connected to the end of the shaft member 591 on the vault 120 side in the D2 direction from the vault 120 side. The cover member 593 covers the steel plate 652 located radially outward from the end of the shaft member 591 on the vault 120 side centered on the axis of the shaft member 591 from the vault 120 side. When the axis of the shaft member 591 is taken as the center, the cover member 593 on the front side in the D1 direction is larger than the cover member 593 on the rear side in the D1 direction. A structure related to a lock (not shown), such as a thumb turn lock, is formed on the cover member 593 mainly on the front side in the D1 direction and the front or rear side in the D3 direction from the axis of the shaft member 591.

[0080] Knob member 594 protrudes further forward in the D2 direction, i.e., toward safe chamber 120, from the front end face in the D2 direction of cover member 593 via a connecting member. Knob member 594 is provided to open and close a lock (not shown), and is configured to be rotatable in the radial direction about the axis of shaft member 591 between a lock position for locking the lock and an unlock position. Shaft member 591, cover members 592, 593, and knob member 594 are made of, for example, SUS.

[0081] As shown in FIG. 3, when viewed along the D3 direction, recesses 765, 766, and 767 recessed toward the outer periphery of the frame 150 are formed at the upper left end, slightly lower than the left center, and lower left end of the frame 150. The sub-lock 576 is composed of three rib members 761 to 763. When viewed from the D2 direction, the rib member 761 is arranged so as to protrude from a predetermined position on the periphery of the connecting member 589 along the radial direction of the rotation center of the connecting member 589. Also, as shown by the solid line in FIG. 3, when the knob 588 is arranged in the closed state with the axis of the shaft member 580 as the center, the rib member 761 is accommodated in the recess 765. On the other hand, when knob 588 is moved from the closed state to the open state as shown by the dotted line in Figure 3 around the axis of shaft member 580, as gripping member 587 rotates, rod-shaped members 598-2, 598-3 rise and fall and connecting member 589 rotates, causing rib member 761 to escape from recess 765.

[0082] The rib members 762 and 763 are arranged so as to protrude from predetermined positions on the peripheries of the gripping member 587 and the connecting member 590 along the radial direction of the rotation center of the gripping member 587 and the connecting member 590 when viewed from the D2 direction. When the knob 588 is arranged in the closed state about the axis of the shaft member 580, the rib members 762 and 763 are accommodated in the recesses 766 and 767, respectively. On the other hand, when the knob 588 is arranged in the open state about the axis of the shaft member 580 from the closed state as shown by the two-dot chain line in FIG. 3, the rod members 598-1 to 598-3 move up and down with the rotation of the gripping member 587, and the gripping member 587 and the connecting member 590 rotate. Therefore, the rib members 762 and 763 escape from the recesses 766 and 767, respectively. In other words, rib members 761-763 are provided at predetermined positions on the periphery of each of connecting member 589, gripping member 587, and connecting member 590 when viewed from direction D2 so that they fit within recesses 765-767 when knob 588 is positioned in a closed position about the axis of shaft member 580, and are outside recesses 765-767 when knob 588 is positioned in an open position about the axis of shaft member 580.

[0083] As shown in FIG. 4 and FIG. 5, when the door structure 501 is closed, the sealing material 770 is disposed between the front end surface of the upper part and the left and right sides of the outer periphery of the second door 512 and the rear end surface of the frame 150 facing the upper part and the left and right sides when viewed from the D2 direction, and seals the gap between the upper part and the left and right sides of the second door 512 and the frame 150. As shown in FIG. 4 and FIG. 5, the frontmost part of the frame 150 in the D2 direction protrudes forward from the second door 512, that is, toward the safe room 120 side. When viewed from the D2 direction, the frontmost part and the upper end of the frame 150 protrudes downward from the upper end of the second door 512. The frontmost part and the left side end and the right end of the frame 150 protrude rightward and leftward from the left end and the right end of the second door 512. In other words, the frontmost part and the upper end and the left and right end of the frame 150 are disposed closer to the center when viewed from the D2 direction than the upper end and the left and right end of the second door 512.

[0084] In the region of the front and upper end and the left and right side ends of the frame 150 facing the second door 512 in the D2 direction, a recess 772 recessed forward from the rear end surface of the frame 150 in the D2 direction is formed. The sealing material 770 is disposed in the recess 772. The tip of the sealing material 770, i.e., the rear end in the D2 direction, protrudes rearward in the D2 direction from the rear end surface of the frame 150 around the recess 772. The tip of the sealing material 770, i.e., the rear end in the D2 direction, is in close contact with the front surface of the second door 512 in the D2 direction when the door structure 501 is closed relative to the frame 150. As a material for the sealing material 770, a material having heat resistance against the temperature of smoke passing through the door structure 501 in the event of a fire (for example, a high temperature of 200°C or more), fire resistance, and impact absorption when the steel plate 652 of the second door 512 hits it is preferable. The sealing material 770 is formed of, for example, silicone rubber, but may be formed of airtight rubber (AT rubber) that is an ethylene-propylene rubber solid rubber integrated with sponge rubber, or other known AT rubber. In consideration of the heat resistance and fire resistance that can be achieved by providing the sealing material 770, it is assumed that the temperature of the heat and smoke that reaches the door structure 501 is lower than the heat resistance temperature of the first door 511, the second door 512, and the sealing material 770.

[0085] As described above, the door structure 501 of the first embodiment includes the first door 511 that is fitted into the frame 150 and can be opened and closed, and the second door 512 that is arranged in contact with the plate surface (one plate surface) 511b of the first door 511 on the safe room 120 side. The first door 511 has a first exterior body 520 that is composed of steel plates 521, 522 and a reinforcing material 528 made of steel materials 523 to 526, a first panel material 530, a fireproof sheet part 540, and a heat-foaming material 560. The first panel material 530 is encapsulated in the first exterior body 520 and contains calcium silicate. The fireproof sheet part 540 covers the steel plate surface 520a of the first exterior body 520 on the opposite side to the surface 520b that forms the plate surface 511b of the first door 511 in the D2 direction, and foams at a predetermined temperature to form a heat insulating layer. The heat-foaming material 560 is arranged on the upper and lower end faces (end faces) and the left and right end faces (end faces) of the first exterior body 520 when viewed from the D2 direction, and foams at a predetermined temperature. The second door 512 has a second exterior body 650 composed of a reinforcing material 670 including steel plates 651, 652 and steel materials 672, 673, 676, 677, and a second panel material 660 that is contained in the second exterior body 650 and contains calcium silicate. A through hole (connection through hole) 720 is formed along the D2 direction (thickness direction) at a predetermined position of the second door 512. The second door 512 is connected to the first door 511 by a connector 721 and a support 722. The connector 721 is inserted into the through hole 720 from the side opposite to the side that abuts against the first door 511 in the D2 direction, and at least the tip of the connector 721 is inserted into the first door 511. The support 722 protrudes from the connector 721 towards the second panel material 660, and supports the connector 721 to the second panel material 660 within the through hole 720. A heat foaming material 733 that foams at a predetermined temperature is disposed on the inner peripheral surface 660s of the second panel material 660 (the peripheral surface of the connection through hole).

[0086] According to the door structure 501 of the first embodiment, the heat resistance and fire resistance of the plate surface portion of the first door 511 can be improved by the first exterior body 520 having the steel plates 521 and 522 and the fireproof sheet part 540 arranged on the plate surface of the first exterior body 520 on the room 110 side, and the weight of the first door 511 can be reduced by using a calcium silicate board 532 as the first panel material 530. Similarly, the heat resistance and fire resistance of the plate surface portion of the second door 512 can be improved by the second exterior body 650 having the steel plates 651 and 652, and the weight of the second door 512 can be reduced by using a calcium silicate board 662 as the second panel material 660. As a result, the construction work of the door structure 501 can be smoothly and efficiently carried out while achieving the fire resistance performance required for the door structure 501 including the first door 511 and the second door 512.

[0087] In the door structure 501 of the first embodiment, the first door 511, which has excellent fire resistance, faces the living room 110 side where fires and the like are likely to occur, and the heated foaming materials 560, 666 are arranged between the frame 150, and the second door 512 and the sealing material 770, which have excellent smoke resistance, are arranged toward the safe room 120 side. Therefore, when a fire occurs in the living room 110 side and flames and smoke are generated, the door structure 501 is closed, and smoke passing through to the safe room 120 side rather than the first door 511 can be blocked. According to the door structure 501 of the first embodiment, fire resistance and smoke resistance can be improved compared to a door structure having only a door similar to the first door 511. This makes it possible to keep the inside of the safe room 120 at an appropriate temperature without exceeding a predetermined temperature due to the arrival of flames and smoke. The predetermined temperature is, for example, "177°C for fireproof safes" in JIS S 1037. According to the door structure 501 of the first embodiment, at least heat insulation and fire insulation are ensured by the first door 511 and the heated foaming materials 560, 666, and further heat insulation and smoke insulation are ensured by the second door 512 and the sealing material 770.

[0088] Furthermore, according to the door structure 501 of the first embodiment, compared to a conventional door structure that is entirely made of metal and integrated, it is easier to separate into several components and parts, and these components and parts can be assembled and completed at the construction site. For example, the first door 511 and the second door 512 can be manufactured separately, and can also be transported and brought in separately. At the construction site, first, the first door 511 is fitted into the frame 150, and then the second door 512 is fitted into the frame 150, while the plate surface of the second door 512 on the living room 110 side is abutted against the plate surface of the first door 511 on the safe room 120 side, and the relative positions of the first door 511 and the second door 512 are adjusted. Next, the connector 721 is inserted through the through hole 720 of the second door 512, and at least the tip of the connector 721 is inserted through the through hole 720 into the first door 511 from the vault 120 side, i.e., the second door side, and the connector 721 is supported on the second panel material 660 by the support 722. Also, at the construction site, before fitting into the frame 150, the fireproof sheet part 540 can be attached to the steel plate surface 520a of the first exterior body 520, or the first panel material 530 can be enclosed in the first exterior body 520 and fixed and reinforced with the steel reinforcing material 528. In this way, even at a construction site with limited space, the assembly of the door structure 501 or the dismantling work performed by reversing the above-mentioned order can be easily carried out, thereby improving the workability. Also, the door structure 501 can be flexibly dismantled or remodeled in response to changes in the environment and setting conditions of the living room 110 and the vault 120.

[0089] According to the door structure 501 of the first embodiment, the fire-resistant sheet portion 32 is mainly composed of ammonium polyphosphate, which is a foaming component, so that an insulating layer is quickly formed on the panel surface of the first exterior body 520 facing the room 110 at a predetermined temperature of approximately 200°C to 300°C, thereby improving the heat resistance and fire resistance of the first door 511.

[0090] The door structure 501 of the first embodiment further includes an operating unit 570. The operating unit 570 includes at least an axis member 580 and grip members 584, 587. The axis member 580 is inserted into a through hole 578 formed coaxially in the first door 511 and the second door 512 along the D2 direction (thickness direction of the first door and the second door). The grip member 584 and the knob (grip member) 585 are connected to an end of the axis member 580 on the room 110 side in the D2 direction (axial direction), and are disposed closer to the room 110 side than the first door 511 in the D2 direction. The axis member 580 can be rotated around the axis of the axis member 580. Grip member 587 and knob (grip member) 588 are connected to the end of shaft member 580 on the vault 120 side in the D2 direction, and are arranged closer to the vault 120 side than second door 512 in the D2 direction, and are configured to be able to rotate shaft member 580 around the axis of shaft member 580. Heat-foamed material 534 is arranged on inner circumferential surface 530s of first panel material 530 around through hole 578. Heat-foamed material 538 is arranged on inner circumferential surface 660s of second panel material 660 around through hole 578.

[0091] According to the door structure 501 of the first embodiment, when a fire breaks out and a flame or the like penetrates the through hole 578, the heated foaming materials 534 and 538 expand, and the gap between the first panel material 530 and the second panel material 660 and the shaft member 580 can be blocked. In the conventional door structure, the through hole through which the shaft member connected to the doorknob or the like is inserted becomes a thermal bridge, and there is a risk of the fire spreading to the living room 110 and the safe room 120. However, even if the shaft member 580, the gripping member 587, the knob 588, etc. melt under high temperature during a fire or are removed from the door structure 501, the door structure 501 can block the flame in the direction D2 even near the gripping member such as the doorknob without making the through hole 578 a thermal bridge, and can prevent the flame from spreading to the living room 110 side or the safe room 120 side. This can improve the fire resistance of the door structure 501.

[0092] The door structure 501 of the first embodiment further includes rib members 761-763 as the sub-lock 576. The gripping member 587 is connected to rod-shaped members 598-1, 598-2, and 598-3 that extend in the vertical direction and move up and down in conjunction with the rotation of the shaft member 580 about the axis of the shaft member 580 and the associated rotation of the gripping member 587. A connecting member 589 or a connecting member 590 is connected to the end of each of the rod-shaped members 598-1, 598-2, and 598-3 opposite to the end connected to the gripping member 587. The connecting members 589 and 590 are arranged to protrude from the upper left end and lower left end of the second door 512 toward the safe room 120 when viewed along the D2 direction, and rotate in conjunction with the movement of the rod-shaped members 598-1, 598-2, and 598-3. The rib 761 is provided on the connecting member 589, and when the gripping member 587 is arranged in the closed state via the knob 588, the rib 761 engages with the frame 150 by fitting into a recess 765 formed in the frame 150, and when the gripping member 587 is arranged in the open state, the rib 762 is released from the engagement with the frame 150 by removing from the recess 765. The rib 762 is provided on the gripping member 587, and when the gripping member 587 is arranged in the closed state via the knob 588, the rib 762 engages with the frame 150 by fitting into a recess 766 formed in the frame 150, and when the gripping member 587 is arranged in the open state, the rib 762 is released from the engagement with the frame 150 by removing from the recess 766. The rib 763 is provided on the connecting member 590, and when the gripping member 587 is arranged in the closed state via the knob 588, the rib 763 engages with the frame 150 by fitting into a recess 767 formed in the frame 150, and when the gripping member 587 is arranged in the open state, the rib 763 is released from the engagement with the frame 150 by removing from the recess 767.

[0093] In the door structure 501 of the first embodiment, the grip member 587, the rod-shaped members 598-1, 598-2, 598-3, and the connecting members 589 and 590, which are components other than the shaft member 580 of the operating unit 570, can be disposed outside the first door 511 and the second door 512. Therefore, according to the door structure 501 of the first embodiment, there is no risk of a thermal bridge being formed when a flame occurs due to the configuration related to the secondary lock 576 other than the through hole 578 around the shaft member 580. When a flame occurs, the through hole 578 around the shaft member 580 is blocked by the heating foaming materials 534 and 538, so the fire resistance of the door structure 501 of the first embodiment can be maintained without relying on the installation of the secondary lock 576.

[0094] The door structure 501 of the first embodiment includes a main lock 575 in addition to the sub-lock 576. The shaft member 591 of the main lock 575 and a lock structure (not shown) are inserted into a through hole 680 formed coaxially in the first door 511 and the second door 512 along the D2 direction. A heat foaming material 754 is arranged on the inner peripheral surface 530t of the first panel material 530 around the through hole 680. A heat foaming material 754 is arranged on the inner peripheral surface 660t of the second panel material 660 around the through hole 680. Therefore, according to the door structure 501, the through hole 680 is not used as a thermal bridge, and the flame can be blocked in the D2 direction even in the vicinity of the cover members 592, 593 and the knob member 594 of the main lock 575. Furthermore, even if the shaft member 591, cover members 592, 593, knob member 594, etc. melt or are missing from the first door 511 and the second door 512, the flames can be prevented from spreading to the living room 110 or the vault 120, thereby maintaining the fire resistance of the door structure 501.

[0095] In the door structure 501 of the first embodiment, the frame 150 has a hollow member 152 made of metal and a filler 154 that fills the hollow space of the hollow member 152.

[0096] In contrast to the door structure 501 of the first embodiment, the hollow of the hollow member 152 is filled with a filler 154 having a higher moisture content than mortar alone. Therefore, when the frame 150 is exposed to a high temperature of about 100°C or higher, the water contained in the gypsum contained in the filler 154 evaporates and generates latent heat, which can suppress a rise in temperature of the frame 150 and the surroundings in the event of a fire or the like. Therefore, in addition to the door structure 501 of the first embodiment, the fire resistance of the surrounding frame 150 can be increased.

[0097] Second embodiment Next, a door structure 502 according to a second embodiment of the present invention will be described with reference to Fig. 9 to Fig. 13. In the second embodiment, components common to the first embodiment are given the same reference numerals as those in the first embodiment, and their description will be omitted, and only the differences from the first embodiment will be described.

[0098] As shown in Fig. 9 and Fig. 10, the door structure 502 of the second embodiment includes a first door 511 arranged on the living room 110 side, a second door 512 arranged on the safe room 120 side, an operating unit 570, and a sealing material 770. The second door 512 of the door structure 502 has a plurality of door parts 800 stacked in the D2 direction (thickness direction), for example, two door parts 800. In the second door 512, a plurality of door parts 800 are stacked in the D2 direction. Each door part 800 includes a second exterior body 650 and a second panel material 660, similar to the second door 512 of the door structure 501 of the first embodiment.

[0099] However, in the door structure 502, the steel material 673 of the door portion 800 other than the door portion 800 farthest from the first door 511 in the D2 direction among the multiple door portions 800, that is, in the second embodiment, the steel material 673 of the first door portion 801 closer to the first door 511 in the D2 direction among the two door portions 800, is composed of a first portion 811, a second portion 812, and a third portion 813, similar to the steel material 524. In other words, the steel material 673 of the first door portion 801 is formed to draw an approximately U-shape when viewed from the D1 direction. The first portion 811 extends parallel to the D2 direction across the steel plates 651 and 652 of the first door portion 801. The second portion 812 protrudes in the D3 direction from the end of the first portion 811 on the room 110 side in the D2 direction, and is fixed to the lower end of the steel plate 651 from the vault 120 side by adhesive, welding, etc. The third portion 813 protrudes in the D3 direction from the end of the first portion 811 on the vault 120 side in the D2 direction, and is fixed to the lower end of the steel plate 652 from the room 110 side by adhesive, welding, etc.

[0100] As shown in FIG. 10, the second part 712 of the steel material 676, which connects the right ends of the steel plates 651 and 652 in the D2 direction when viewed along the D2 direction in the first door section 801, protrudes in the opposite direction to the D1 direction from the end of the first part 711 on the living room 110 side in the D2 direction. The third part 713 protrudes in the opposite direction to the D1 direction from the end of the first part 711 on the safe room 120 side in the D2 direction. The second part 716 of the steel material 677, which connects the left ends of the steel plates 651 and 652 in the D2 direction when viewed along the D2 direction in the first door section 801, protrudes in the D1 direction from the end of the first part 715 on the living room 110 side in the D2 direction. The third part 717 protrudes in the D1 direction from the end of the first part 715 on the safe room 120 side in the D2 direction. Similar to the steel materials 672 and 673 shown in Fig. 9, a heat-foamed material 666 is provided on the side opposite to the side in contact with the second panel material 660 of each of the first portion 711 of the steel material 676 and the first portion 715 of the steel material 677. The heat-foamed material 666 is fixed to the right end and left end of the second panel material 660 of the first door section 801 with screws 668, sandwiching the first portions 711 and 715 therebetween.

[0101] In the door structure 502, the steel material 672 of the door part 800 farthest from the first door 511 in the D2 direction among the multiple door parts 800, that is, in the second embodiment, the second part 682 of the steel material 672 of the second door part 802 farthest from the first door 511 in the D2 direction among the two door parts 800, protrudes in the D3 direction from the end of the first part 681 on the living room 110 side in the D2 direction. The third part 683 protrudes in the D3 direction from the end of the first part 681 on the safe room 120 side in the D2 direction. Note that the heat foaming material is not disposed in the steel material 672 of the second door part 802. Each of the steel materials 673, 676, 677 of the second door part 802 is formed in the same manner as each of the steel materials 673, 676, 677 described with respect to the second door 512 of the first embodiment. The first locking portion 701 is disposed between the second portion 686 of the steel material 673 of the door portion 800 that is the farthest from the first door 511 in the D2 direction among the multiple door portions 800, that is, in the second embodiment, the second door portion 802 that is the farthest from the first door 511 in the D2 direction among the two door portions 800, and the lower portion of the frame 150. In the door structure 502, each of the steel materials 674, 675 protrudes toward the vault 120 from the plate surface on the vault 120 side of the lower end portion of the steel plate 652 of the second door portion 802, and is formed in the same manner as each of the steel materials 674, 675 described for the second door 512 in the first embodiment.

[0102] 9 to 13 show an example of the second door 512 made up of two door sections 800, but when the second door 512 is made up of three or more door sections 800, the door sections 800 other than the door section 800 arranged farthest from the first door 511 in the D2 direction among the multiple door sections 800 have the same configuration as the above-mentioned first door section 801, except that the upper and left and right sides shrink toward the center as they proceed in the D2 direction as described below, and have steel materials of the same shape as the steel materials of the first door section 801. Also, in the door structure 502, only the door section 800 arranged farthest from the first door 511 in the D2 direction among the multiple door sections 800 has flattened side edges on the upper, lower, left and right sides when viewed from the D2 direction.

[0103] When viewed from the D2 direction, in the portion where the second door 512 is fitted at the top of the frame 150, the portion where the second door section 802 is fitted protrudes downward from the portion where the first door section 801 is fitted. In the portion where the second door 512 is fitted at the left and right parts of the frame 150, the portion where the second door section 802 is fitted protrudes to the right and left from the portion where the first door section 801 is fitted. Therefore, when viewed from the D2 direction, the upper end of the second door section 802 is located lower than the upper end of the first door section 801. The left end and right end of the second door section 802 are located to the right and left of the left end and right end of the first door section 801. The lower end of the second door section 802 approximately overlaps with the lower end of the first door section 801.

[0104] The sealing material 770 is disposed between the front end surface of the upper and left and right sides of the outer periphery of each of the door sections 800 and the rear end surface of the frame 150 facing the upper and left and right sides when viewed from the D2 direction with the door structure 502 closed, and seals the gap between the upper and left and right sides of each door section 800 and the frame 150. The frontmost part of the frame 150 in the D2 direction protrudes forward, i.e., toward the safe room 120, from the second door section 802. When viewed from the D2 direction, the frontmost part and upper end of the frame 150 protrudes downward from the upper end of the second door section 802. Although not shown, the frontmost part and left and right ends of the frame 150 protrude rightward and leftward from the left and right ends of the second door section 802. In other words, the frontmost part, upper end and left and right side ends of the frame 150 are positioned closer to the center of the second door section 802 when viewed from the D2 direction than the upper end and left and right side ends of the second door section 802, i.e., the door section 800 that is the farthest from the first door 511 in the D2 direction among the multiple door sections 800.

[0105] In addition, even when the second door 512 is composed of three or more door sections 800, in two door sections 800 adjacent to each other in the D2 direction in the multiple door sections 800, the front part, upper end, and left and right side ends of the second door section 802 farther from the first door 511 among the two door sections 800 are closer to the center of the first door section 801 as viewed from the D2 direction than the upper end and left and right side ends of the first door section 801 closer to the first door 511 in the D2 direction among the two door sections 800 adjacent to each other in the D2 direction in the multiple door sections 800. In addition, in the door structure 502, in order to prevent each of the above-mentioned steel materials from becoming a thermal bridge in the event of a fire, the steel materials 672 to 677 of the multiple door sections 800 are arranged at different positions from each other in the D1 direction or the D3 direction and at different positions from the steel materials 523 to 526, and are arranged so that these steel materials are not arranged in a straight line along the D2 direction.

[0106] A recess 772 recessed forward in the D2 direction is formed on the opposing surface 153 having an area facing each of the door parts 800, i.e., the first door part 801 or the second door part 802, in the D2 direction at the upper end and left and right side ends of the frame 150. The tip of the sealing material 770 protrudes rearward in the D2 direction from the opposing surface 153 around the recess 772. The tip of each sealing material 770, i.e., the rear end in the D2 direction, is in close contact with the front surface in the D2 direction of each door part 800. In other words, the upper end, left and right side ends, and the front surface in the D2 direction of all the door parts 800 in the closed state when viewed along the D2 direction are sealed by the sealing material 770.

[0107] In the door structure 501 of the first embodiment, the opening of the through hole 720 on the vault 120 side is covered by a cover plate 740, while in the door structure 502 of the second embodiment, the opening of the through hole 720 formed in the first door section 801 on the vault 120 side is covered from the vault 120 side by a steel plate 651 of a second exterior body 650 of the second door section 802.

[0108] As shown in FIG. 9 and FIG. 10, the first door section 801 and the second door section 802 are connected by a connector 821 and a support 822. A plurality of through holes (connecting through holes) 820 are formed in the second door section 802. The through holes 820 are arranged at positions different from the through holes 720 in the D1 and D3 directions, and do not overlap with the through holes 720 at all. Each through hole 820 is formed along the D2 direction. When viewed along the D2 direction, the plurality of through holes 820 are formed at positions different from at least the plurality of through holes 720 in the D1 and D3 directions, specifically, in an area closer to the center of the first door section 801 than the plurality of through holes 720, and are formed at intervals from each other along the circumferential direction. A metal guide pipe 830 is arranged on the inner peripheral surface 660w of the second panel material 660 of the second door section 802 that forms the peripheral surface of the through holes 820. The through hole 820 and the guide pipe 830 have a rectangular shape when viewed along the D2 direction.

[0109] A bolt 823 is inserted as a connector 821 into the through hole 820 with its axis parallel to the D2 direction. A guide material 835 and a guide plate 836 are provided on the steel plate 652 of the first door section 801 facing the inside of the through hole 820 from the safe room 120 side. At least the tip of a threaded shaft portion 826 of the bolt 823 penetrates the guide material 835, the guide plate 836, and the steel plate 652 of the first door section 801 from the side opposite to the side where the second door section 802 abuts against the first door section 801 in the D2 direction, i.e., from the safe room 120 side, and is inserted into the second panel material 660 of the first door section 801.

[0110] The bolt 823 is provided with flange plates 824 and 825 as supports 822, which protrude toward the second panel material 660 of the second door section 802 in the through hole 820. The flange plates 824 and 825 are inserted in sequence through the shaft portion 826 so as to contact the head 827 of the bolt 823 from the room 110 side in the D2 direction. The flange plates 824 and 825 protrude toward the second panel material 660 of the second door section 802, that is, radially outward from the axis of the bolt 823 in a plane including the D3 direction. The flange plate 824 is inserted from the through hole 820 through the guide pipe 830 and inserted into the second panel material 660 of the second door section 802. The flange plate 825 is engaged with the inner peripheral surface 830s of the guide pipe 830. The flange plates 824 and 825 are formed of, for example, steel. A heat foaming material (third heat foaming material) 833 that foams at a predetermined temperature is provided on an inner peripheral surface 830s exposed to the hollow portion of the guide pipe 830. As with the heat foaming material 560, the heat foaming material 833 may be, for example, a known fire-resistant heat foaming material, a thermally expandable fireproof material, or a commercially available FiBlock.

[0111] A reinforcing member 838 protruding radially outward from the guide pipe 830 is embedded in the second panel material 660 of the second door section 802 near the end of the guide pipe 830 on the vault 120 side. The reinforcing member 838 is formed of a metal such as SUS. The end of the guide pipe 830 on the vault 120 side, that is, the opening of the guide pipe 830 on the vault 120 side and the steel plate 652 of the second door section 802 adjacent to the end, are covered by a cover plate 840 from the vault 120 side. The cover plate 840 is formed of, for example, a steel material. The cover plate 840 covering the steel plate 652 of the second door section 802 adjacent to the end of the guide pipe 830 on the vault 120 side is fixed to the steel plate 840 of the second door section 802, the reinforcing member 738, and the second panel material 660 from the vault 120 side by screws or the like shown by dashed lines in FIG. 11.

[0112] In addition, when the second door 512 is composed of three or more door sections 800, the door section 800 closer to the first door 511 of two door sections 800 adjacent to each other in the D2 direction is referred to as the first door section 801, and the door section 800 farther from the first door 511 is referred to as the second door section 802, and all the first door sections 801 and the second door sections 802 are connected by the connectors 821 and the supports 822 as described above. When viewed from the D2 direction, the through holes 820 formed in the second door section 802 of the three or more door sections 800 are formed at positions different from the through holes 820 formed in the other second door sections 802 in the D1 and D3 directions, and do not overlap at all with the through holes 820 formed in the other second door sections 802. This makes it possible to prevent the through hole 820 from becoming a thermal bridge in the event of a fire in the living room 110 or the safe room 120, even if the second door 512 is composed of three or more door sections 800.

[0113] In the door structure 502, the operating unit 570 includes the shaft 571, the grips 572 and 573, the lifting member 574, the main lock 575, and the sub-lock (lock) 576 described in the first embodiment. As shown in FIG. 12, the shaft member 580 is inserted into a through hole 578 formed coaxially in the first door portion 801 and the second door portion 802 of the first door 511 and the second door 512 along the D2 direction. A steel material 535 is provided on the inner peripheral surface 660s of the second panel material 660 of all the door portions 800 around the through hole 578. In addition, a heat foaming material (sub-heat foaming material) 538 is provided on the inner peripheral surface of the first portion 536 of the steel material 535 arranged in all the door portions 800 on the side opposite to the second panel material 660 side. This prevents the through hole 578 from becoming a thermal bridge in the event of a fire in the living room 110 or the vault 120, even if the second door 512 is composed of multiple door sections 800.

[0114] In the door structure 502, the lock 575 includes the shaft member 591, cover members 592 and 593, and knob member 594 described in the first embodiment. As shown in FIG. 13, the shaft member 591 is inserted into a through hole 680 formed coaxially in the first door section 801 and the second door section 802 of the first door 511 and the second door 512 along the D2 direction. A steel material 755 is provided on the inner peripheral surface 660t of the second panel material 660 of all door sections 800 around the through hole 680. In addition, a heating foaming material 758 is provided on the inner peripheral surface of the first part 756 of the steel material 755 arranged in all door sections 800 on the side opposite to the second panel material 660 side. This makes it possible to prevent the through hole 680 from becoming a thermal bridge when a fire occurs in the living room 110 or the safe room 120, even if the second door 512 is composed of a plurality of door sections 800.

[0115] As described above, the door structure 502 of the second embodiment, like the door structure 501 of the first embodiment, includes the first door 511 that is fitted into the frame 150 and can be opened and closed, and the second door 512 that is arranged in contact with a plate surface (one plate surface) 511b of the first door 511 facing the safe room 120. The door structure 502 of the second embodiment has the same configuration as the door structure 501 of the first embodiment, and therefore provides the same effects as those of the door structure 501 of the first embodiment described above.

[0116] In the door structure 502 of the second embodiment, the second door 512 has a plurality of door sections 800 stacked in the D2 direction (thickness direction of the second door). Each door section 800 has a second exterior body 650 and a second panel material 660. Of the two door sections 800 adjacent to each other in the D2 direction in the plurality of door sections 800, the second door section 802 farther from the first door 511 has a through hole 820 formed along the D2 direction. The second door section 802 is connected to the first door section 801 by a connector 821, at least the tip of which is inserted into the first door section 801 from the side opposite to the side in contact with the first door section 801 closer to the first door 511 among two door sections 800 adjacent to each other in the D2 direction in the plurality of door sections 800, i.e., from the safe room 120 side in the D2 direction, and a support 822 that protrudes from the connector 821 to the second panel material 660 of the second door section 802 and supports the connector 821. A heat foaming material 833 that foams at a predetermined temperature is arranged on an inner peripheral surface (peripheral surface of the connection through hole) 660w of the second panel material 660 of the second door section 802. In the door structure 502 of the second embodiment, the through hole 720 used to connect the first door 511 and the door section 800 (i.e., the first door section 801) closest to the first door 511 among the multiple door sections 800 of the second door 512, and the through hole 820 used to connect the first door section 801 and the second door section 802 among the multiple door sections 800 are arranged in different positions from each other when viewed from the D2 direction.

[0117] According to the door structure 502 of the second embodiment, the second door 512 is constructed by stacking a plurality of door sections 800 in the D2 direction, so that the fire resistance of the second door 512 can be improved compared to the single-layered second door 512. As a result, the fire resistance of the door structure 502 can be improved. In addition, in the door structure 502 of the second embodiment, the plurality of door sections 800 can be handled individually, and the connection work and dismantling work of the plurality of door sections 800 in the D2 direction can be performed at the construction site. Specifically, for example, in the case of the connection work, the first door section 801 of the plurality of door sections 800 is first used as the second door 512 and is connected to the first door 511 by the connector 721 and the support 722 in the same manner as the door structure 501 of the first embodiment. Next, the relative position of the second door section 802 is adjusted with respect to the first door section 801, and the connector 821 is inserted from the safe room 120 side in the D2 direction into the through hole 820 formed in the second door section 802, and at least the tip of the connector 821 is inserted into the second panel material 660 of the first door section 801, and the connector 821 is supported on the second panel material 660 of the second door section 802 by the support 822, thereby connecting the first door section 801 and the second door section 802 with the connector 821 and the support 822. When the second door 512 has three or more door sections 800, the first door section 801 closer to the first door 511 and the second door section 802 farther from the first door 511 among the door sections 800 adjacent to each other in the D2 direction may be connected with the connector 821 and the support 822 according to the total number of the door sections 800. The dismantling work of the multiple door sections 800 in the D2 direction can be performed by performing the above-mentioned connecting work in the reverse order. Since the connecting work and dismantling work of the multiple door sections 800 in the D2 direction can be performed in this way, the door structure 502 of the second embodiment can maintain high workability as with the door structure 501 of the first embodiment. In addition, the number of door sections 800 included in the second door 512 can be easily changed depending on the fire resistance performance required for the door structure 502.

[0118] Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to such a specific embodiment, and various modifications are possible within the scope of the gist of the present invention described in the claims.

[0119] For example, the door structures of the present invention, including the door structures 501 and 502 of the above-mentioned embodiments, are not limited to use for safe doors, but can be widely applied to structures that require ensuring fire resistance on the back side of the door and door structures other than safe doors.

[0120] The sub-lock (lock) of the door structure according to the present invention is not limited to being connected to each of the gripping member 587 and the connecting members 589, 590 arranged exposed to the outside on the safe room 120 side. For example, the sub-lock may be arranged on at least one of the gripping member 587 and the connecting members 589, 590. In addition, when a through hole is formed in the door structure to allow the shaft member of a lock other than the main lock or other members to pass through, it is preferable to arrange a heat foaming material on the inner wall of the through hole. [Explanation of symbols]

[0121] 150 slots 501, 502 Door structure 511 Door 1 512 Door 2 520 First Exterior Body 530 First Panel Material 540 Fireproof Sheet Section 650 Second Exterior Body 660 Second Panel Material 720 Through hole (connection through hole) 721 Connectors 722 Supports 800 Door section 801 First Door 802 Second Door

Claims

1. A first door that is fitted into the frame and can be opened and closed; A second door arranged in contact with one plate surface of the first door; Equipped with The first door is A first exterior body having a steel plate; A first panel material that is enclosed in the first exterior body and contains calcium silicate; a fireproof sheet portion that covers a surface of the first exterior body opposite to the surface that forms the one plate surface and foams at a predetermined temperature to form a heat insulating layer; A first heat-foaming material that is arranged to cover an upper end surface of the first exterior body and foams at a predetermined temperature; having The second door is A second exterior body having a steel plate; A second panel material that is enclosed in the second exterior body and contains calcium silicate; having The second door is provided with a connection through hole along a thickness direction, the second door is connected to the first door by a connector that is inserted into the connection through hole from the side opposite to the side that abuts against the first door in the thickness direction and at least a tip portion of the connector is inserted into the first door, and a support that protrudes from the connector toward the second panel material and supports the connector, A second heat-foaming material that foams at a predetermined temperature is disposed on the peripheral surface of the connection through hole. Door structure.

2. The second door has a plurality of door portions stacked in the thickness direction, Each of the door portions has the second exterior body and a second panel material, Among the plurality of door sections, two door sections adjacent to each other in the thickness direction are provided with a second door section farther from the first door section, and a connecting through hole is formed along the thickness direction, The second door section is connected to the first door section by a connector that is inserted into the connecting through hole from the side opposite to the side that contacts the first door section that is closer to the first door out of the two door sections adjacent to each other in the thickness direction and at least a tip portion of the connector is inserted into the first door section, and a support that protrudes from the connector to the second panel material of the second door section and supports the connector, a third heat-foaming material that foams at a predetermined temperature is disposed on a peripheral surface of the connecting through hole; The connection through hole and the coupling through hole are disposed at different positions from each other when viewed in the thickness direction. The door structure according to claim 1 .

3. The fireproof sheet portion is mainly composed of ammonium polyphosphate. The door structure according to claim 1 or 2.

4. Further comprising an operation unit, The operation unit includes: a shaft member inserted into a shaft insertion through hole formed in the first door and the second door along a thickness direction of the first door and the second door; A gripping member connected to an end of the shaft member in an axial direction and configured to be rotatable around the axis of the shaft member; having a sub-heating foaming material that foams at a predetermined temperature is disposed on each of the inner peripheral surfaces of the first panel material and the second panel material around the shaft insertion through hole; The door structure according to any one of claims 1 to 3.

5. Further equipped with locks, A rod-shaped member is connected to the gripping member, the rod-shaped member extending in the vertical direction and rising and falling in conjunction with the rotation of the shaft member about the axis line, a connecting member that rotates in conjunction with the elevation and lowering of the rod-shaped member is connected to an end of the rod-shaped member opposite to the end connected to the gripping member, The lock is provided on the gripping member and the connecting member, When the gripping member is disposed in a closed state, the lock and the frame are engaged with each other, and when the gripping member is disposed in an open state, the lock and the frame are disengaged from each other. The door structure according to claim 4.

6. The frame is A hollow metal member; Any one of gypsum, mortar, and gypsum mixed with cement, filled in the hollow of the hollow member; having A door structure according to any one of claims 1 to 5.

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