building

Abstract

The present invention provides a building that can prevent the first and second stair sections from burning down simultaneously due to heat. [Solution] The building is a steel-framed building. The building comprises a building body, a stairwell 3, a first staircase 4, and a second staircase 5. The first staircase 4 has a first passage section 41 provided on each floor, and a first staircase section 45 provided in the first passage section 41 on each floor from the evacuation floor to the floor below the top floor. The second staircase 5 has a second passage section 61 provided on each floor, and a second staircase section 65 provided in the second passage section 61 on each floor from the evacuation floor to the floor below the top floor. When viewed from the stair width direction of the first staircase section 45, each of the multiple first staircase sections 45 is arranged to intersect with the second staircase section 65 that connects the same floor as the first staircase section 45. Fire-resistant material 6 is placed on the underside of the first staircase section 45 and the underside of the second staircase section 65.

Description

Technical Field

[0001] This disclosure relates to buildings.

Background Art

[0002] For the purpose of ensuring evacuation routes in case of fire, a plurality of stairs independent of each other are required by law to be installed in a predetermined building. Examples of the predetermined building include large-scale buildings, apartment houses, and buildings used by the public. Examples of buildings used by the public include theaters, cinemas, hospitals, schools, department stores, etc. And in this type of building, one staircase is arranged at a place separated from the other staircases.

[0003] Patent Document 1 discloses the following technique. In this document, in a high-rise building, two staircases are accommodated in a staircase room. The staircases are made of precast concrete.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in a steel-frame building, it is difficult to accommodate two staircases in one staircase room. In a steel-frame building, the staircases are composed of steel materials. Since the steel materials have poor fire resistance, there is a risk that the two staircases will burn simultaneously.

Means for Solving the Problems

[0006] (1) A building that solves the above problem is a steel-framed building comprising a building body, a stairwell provided in the building body and separated from other rooms by a fire-resistant partition wall, a first staircase provided in the stairwell, and a second staircase provided in the stairwell, wherein the first staircase has a first passage section provided on each floor and a first staircase section provided in the first passage section on each floor from the evacuation floor to the floor below the top floor, and the second staircase has a second passage section provided on each floor and a second staircase section provided in the second passage section on each floor from the evacuation floor to the floor below the top floor, wherein, when viewed from the stair width direction of the first staircase, each of the multiple first staircase sections is arranged to intersect with the second staircase section that connects the same floor as the first staircase, and fire-resistant material is provided on the underside of the first staircase and the underside of the second staircase.

[0007] With this configuration, the fire-resistant materials placed under the first and second staircases of the building prevent both sections from burning down simultaneously due to heat.

[0008] (2) The building described in (1) above is further provided with fire-resistant partition walls arranged between the plurality of first stair sections and the plurality of second stair sections. With this configuration, if a fire occurs in one of the first stair sections or the second stair section, it is possible to suppress the spread of the fire from one to the other.

[0009] (3) In the building described in (2) above, the first passageway and the second passageway are made of concrete.

[0010] This configuration makes it possible to suppress the spread of fire from one of the upper and lower spaces of the first passageway to the other. Furthermore, it also makes it possible to suppress the spread of fire from one of the upper and lower spaces of the second passageway to the other.

[0011] (4) The building described in (3) above further comprises a first firewall separating the space of the first passage on the top floor from the space above the second staircase extending to the top floor, and a second firewall separating the space of the second passage on the top floor from the space above the first staircase extending to the top floor, wherein the stairwell is divided into a first stairwell containing the first staircase and a second stairwell containing the second staircase by the fireproofing material, the fireproof partition wall, the first passage, the second passage, the first firewall, and the second firewall.

[0012] This configuration makes it possible to suppress the spread of fire from one of the first and second stairwells to the other. Therefore, if a fire occurs in one of the first or second stairwells, it is possible to suppress its spread from one to the other.

[0013] (5) For any building described in any one of (1) to (4) above, the first staircase is configured in a spiral shape in plan view, and the second staircase is configured in a spiral shape in plan view.

[0014] This configuration allows for a reduction in the volume occupied by the first staircase within the building compared to a configuration where the first staircase is not spiral-shaped. Furthermore, it allows for a reduction in the volume occupied by the second staircase within the building compared to a configuration where the second staircase is not spiral-shaped.

[0015] (6) For any building described in any one of (2) to (5) above, the first end of the fire-resistant material, which is one end in the direction of the width of the stairs, is in contact with the fire-resistant partition wall, and the second end of the fire-resistant material, which is the other end in the direction of the width of the stairs, is in contact with the fire-resistant partition wall.

[0016] This configuration makes it possible to prevent flames from entering the space between the first staircase and the fire-resistant material, or the space between the second staircase and the fire-resistant material.

[0017] (7) For the building according to any one of (1) to (6) above, the fireproof material is fixed to each of the first staircase part and the second staircase part by a connecting member, the connecting member in the first staircase part is arranged in the space between the first staircase part and the fireproof material, and the connecting member in the second staircase part is arranged in the space between the second staircase part and the fireproof material. According to this configuration, it is possible to suppress the connecting member from being exposed to flames.

Effect of the Invention

[0018] According to the building of the present disclosure, it is possible to suppress the first staircase part and the second staircase part from burning down due to heat at the same time.

Brief Description of the Drawings

[0019] [Figure 1] It is a cross-sectional view of a building cut near the ceiling of the third floor. [Figure 2] It is a cross-sectional view of the building along the line 2-2 in FIG. 1. [Figure 3] It is a longitudinal sectional view of a staircase room. [Figure 4] It is a cross-sectional view of the staircase room along the line 4-4 in FIG. 3. [Figure 5] It is a perspective view of a staircase room. [Figure 6] It is a perspective view of a staircase room in which the first staircase room in FIG. 5 is indicated by black dots. [Figure 7] It is a side view of the first staircase part where a fireproof material is arranged. [Figure 8] It is a perspective view of the first staircase part where a fireproof material is arranged. [Figure 9] It is a longitudinal sectional view of the staircase room along the line 9-9 in FIG. 4. [Figure 10] It is an enlarged view of the cross section of the first staircase part and the second staircase part in FIG. 9.

Mode for Carrying Out the Invention

[0020] [Building] The building 1 of this embodiment will be described with reference to Figures 1 to 10. The building 1 of this embodiment is a steel-framed building. Examples of building 1 include residential facilities such as apartment buildings, lodging facilities, medical facilities, and elderly care facilities, as well as commercial facilities such as shopping malls, office buildings, and indoor amusement parks. The building 1 of this embodiment is a three-story apartment building. Figures 1 and 2 illustrate a three-story building, but building 1 may have more than three floors.

[0021] As shown in Figures 1 and 2, the building 1 comprises the building body 2, a stairwell 3, a first staircase 4, and a second staircase 5.

[0022] As shown in Figures 1 and 2, the building structure 2 has multiple dwelling units 11 and corridors 12. Dwelling units 11 are provided on each floor. The stairwell 3 is provided in the building structure 2 independently of the dwelling units 11. The building structure 2 has corridors 12 on each floor that connect the multiple dwelling units 11. The stairwell 3 is provided as an escape staircase.

[0023] As shown in Figure 2, the building body 2 comprises a foundation 13, an exterior wall 14, a roof section 17, and a fire compartment wall 21. The stairwell 3 is located in the building body 2 and separated from other rooms by the fire compartment wall 21. The fire compartment wall 21 is configured to surround the first staircase 4 and the second staircase 5. In plan view, the fire compartment wall 21 is rectangular. The fire compartment wall 21 comprises a first fire compartment wall 22, a second fire compartment wall 23, a third fire compartment wall 24, and a fourth fire compartment wall 25. The third fire compartment wall 24 is positioned opposite the first fire compartment wall 22. The fourth fire compartment wall 25 is positioned opposite the second fire compartment wall 23. The first fire compartment wall 22, the second fire compartment wall 23, the third fire compartment wall 24, and the fourth fire compartment wall 25 are connected in this order in a ring shape when viewed from above.

[0024] The exterior wall 14 separates the interior from the exterior. The exterior wall 14 has an exterior surface 15 and an exterior surface 16. The exterior surface 16 faces the interior.

[0025] The foundation 13, exterior walls 14, roof section 17, and fire-resistant partition walls 21 are constructed of reinforced concrete or steel-reinforced concrete, etc.

[0026] [Staircase] As shown in Figure 2, the stairwell 3 is provided from the evacuation floor to the top floor. The evacuation floor is the floor from which one can evacuate from the building 1. An exit 93 to the ground is provided on the evacuation floor. In this embodiment, the evacuation floor is the first floor.

[0027] As shown in Figure 2, in this embodiment, the stairwell 3 extends from the first floor to the third floor. The stairwell 3 has a vertically continuous space that spans multiple floors from the first to the third floor.

[0028] As shown in Figures 3 and 4, the stairwell 3 is partitioned by the foundation 13, the roof section 17, and the first to fourth fire compartment walls 22 to 25.

[0029] Referring to Figures 3 to 5, the first staircase 4 and the second staircase 5 will be explained. The first staircase 4 and the second staircase 5 are located in the stairwell 3. The second staircase 5 is a staircase independent of the first staircase 4. That is, people on each floor can move to the evacuation floor using only the first staircase 4. People on each floor can move to the evacuation floor using only the second staircase 5.

[0030] [1st staircase] As shown in Figures 3 and 5, the first staircase 4 has a plurality of first passage sections 41 and a plurality of first staircase sections 45.

[0031] The first passageway section 41 is provided on each floor. The first passageway section 41 connects to the corridor 12 on the same floor as the floor on which the first passageway section 41 is provided. The first passageway section 41 is made of concrete. In one example, the first passageway section 41 is made of ALC panels. ALC is an abbreviation for Autoclaved Lightweight Aerated Concrete.

[0032] As shown in Figures 2 to 5, a stairwell entrance 94 is provided in the fire compartment wall 21 separating the first passageway 41 and the corridor 12. A fire door 95 is provided at the stairwell entrance 94.

[0033] The first staircase section 45 is constructed of steel. The first staircase section 45 has treads 51, risers 52, and a pair of stringers 53. Fire-resistant panels may be attached to the treads 51, risers 52, and stringers 53.

[0034] A portion of the first staircase section 45 may be made of materials other than iron. For example, the treads 51 and risers 52 may be made of iron. The stringers 53 may be made of fire-resistant material 6.

[0035] The first staircase section 45 is provided on each floor from the evacuation floor down to the floor below the top floor. In this embodiment, the first staircase section 45 is provided on the first and second floors. The first staircase section 45 is provided in the first passage section 41 on each floor. The first staircase section 45 extends upward from the first passage section 41.

[0036] Specifically, the first staircase section 46 on the first floor connects the first corridor section 42 on the first floor to the first corridor section 43 on the second floor. The first staircase section 47 on the second floor connects the first corridor section 43 on the second floor to the first corridor section 44 on the third floor.

[0037] As shown in Figure 5, in a plan view, the first staircase 4 is configured to descend counterclockwise when viewed from above. Thus, in a plan view, the first staircase 4 is configured in a spiral shape.

[0038] [Second staircase] As shown in Figures 3 and 5, the second staircase 5 has a plurality of second passage sections 61 and a plurality of second staircase sections 65.

[0039] The second passageway section 61 is provided on each floor. The second passageway section 61 connects to the corridor 12 on the same floor as the floor on which the second passageway section 61 is provided. The second passageway section 61 is made of concrete. In one example, the second passageway section 61 is made of ALC panels.

[0040] As shown in Figures 2 to 5, a stairwell entrance 94 is provided in the fire compartment wall 21 separating the second passageway 61 and the corridor 12. A fire door 95 is provided at the stairwell entrance 94.

[0041] The second staircase section 65 is constructed of steel. The second staircase section 65 has treads 71, risers 72, and a pair of stringers 73. Fire-resistant panels may be attached to the treads 71, risers 72, and stringers 73.

[0042] A portion of the second staircase section 65 may be made of materials other than iron. For example, the treads 71 ​​and risers 72 may be made of iron. The stringers 73 may be made of fire-resistant material 6.

[0043] The second staircase section 65 is provided on each floor from the evacuation floor down to the floor below the top floor. In this embodiment, the second staircase section 65 is provided on the first and second floors. The second staircase section 65 is provided in the second passage section 61 on each floor. The second staircase section 65 extends upward from the second passage section 61.

[0044] Specifically, the second staircase section 66 on the first floor connects the second corridor section 62 on the first floor to the second corridor section 63 on the second floor. The second staircase section 67 on the second floor connects the second corridor section 63 on the second floor to the second corridor section 64 on the third floor.

[0045] As shown in Figure 5, in a plan view, the second staircase 5 is configured to descend counterclockwise when viewed from above. Thus, the second staircase 5 is configured in a spiral shape in a plan view.

[0046] [Arrangement of the first and second stair sections] The first stair section 45 and the second stair section 65 are arranged adjacent to each other in the direction of the stair width. Here, the direction of the stair width refers to the direction perpendicular to the direction in which the stair section extends and the vertical direction.

[0047] As shown in Figure 3, each of the multiple first stair sections 45 is positioned to intersect with the second stair section 65, which connects the same floor as the first stair section 45, when viewed from the stair width direction of the first stair section 45.

[0048] Specifically, the first staircase section 46 on the first floor, which connects the first and second floors, and the second staircase section 66 on the first floor, which connects the first and second floors, are arranged to intersect when viewed from the direction of the staircase width. Also, the first staircase section 47 on the second floor, which connects the second and third floors, and the second staircase section 67 on the second floor, which connects the second and third floors, are arranged to intersect when viewed from the direction of the staircase width.

[0049] [Fireproof material] As shown in Figures 3 and 5, the fire-resistant material 6 is placed on the underside of the first staircase section 45 and the underside of the second staircase section 65, respectively.

[0050] Specifically, one fire-resistant material 6 is positioned below the first stair section 45 so as to be aligned with the direction in which the first stair section 45 extends. Hereinafter, the fire-resistant materials 6A,6 provided below the first stair section 45 will be referred to as the first fire-resistant material 6A.

[0051] The other fire-resistant materials 6 are positioned below the second staircase 65 so as to be in the direction in which the second staircase 65 extends. Hereinafter, the fire-resistant materials 6B,6 provided below the second staircase 65 will be referred to as the second fire-resistant material 6B.

[0052] In this embodiment, the fire-resistant material 6 is composed of two fire-resistant boards 81. The two fire-resistant boards 81 are overlapped. An example of a fire-resistant board 81 is gypsum board.

[0053] [Fire protection material connection structure] Referring to Figures 7 to 10, the connection structure of the fire-resistant material 6 in the first stair section 45 or the second stair section 65 is shown.

[0054] The fire-resistant material 6 is fixed to the first stair section 45 and the second stair section 65, respectively, by connecting members 91. The connecting member 91 has a fixing portion 91A and an attachment portion 91B that extends perpendicularly to the fixing portion 91A. In this embodiment, an L-shaped angle 92 is used as the connecting member 91.

[0055] Figures 7 and 8 show the first stair section 45. Figures 9 and 10 show the first stair section 45 and the second stair section 65.

[0056] As shown in Figure 10, the fire-resistant material 6 has a first surface 82 and a second surface 83. The second surface 83 is the surface opposite to the first surface 82. The first surface 82A of the first fire-resistant material 6A faces the treads 51 and risers 52 of the first stair section 45. The first surface 82B of the second fire-resistant material 6B faces the treads 71 ​​and risers 72 of the second stair section 65.

[0057] The first fire-resistant material 6A is positioned along the lower end 53C of the side stringer of the first staircase section 45 (see Figure 7). The second fire-resistant material 6B is positioned along the lower end 73C of the side stringer of the second staircase section 65.

[0058] The second surface 83 is the surface opposite to the first surface 82. The fire-resistant material 6 is positioned along the lower end 53C of the side stringer of the first stair section 45 or the lower end 73C of the side stringer of the second stair section 65.

[0059] The fire-resistant material 6 has a first end 84, which is one end in the direction of the stair width, and a second end 85, which is the other end in the direction of the stair width. The first end 84 is the end facing the fire compartment wall 21. The first end 84 is in contact with the fire compartment wall 21. The second end 85 is the end facing the fire partition wall 26. The second end 85 is in contact with the fire partition wall 26.

[0060] The first fire-resistant material 6A of the first staircase section 45 will be described in detail. The first end 84A of the first fire-resistant material 6A is in contact with the first fire-resistant compartment wall 22. The second end 85A of the first fire-resistant material 6A is in contact with the fire-resistant partition wall 26.

[0061] On the first surface 82A of the first fire-resistant material 6A, the portion 82C on the side of the first end 84A contacts the lower surface of the side beam 53A on the side of the first fire compartment wall 22 in the first staircase section 45. On the first surface 82A of the first fire-resistant material 6A, the portion 82E on the side of the second end 85A contacts the lower surface of the side beam 53B on the side of the fire partition wall 26 in the first staircase section 45.

[0062] The second fire-resistant material 6B of the second staircase section 65 will be described in detail. The first end 84B of the second fire-resistant material 6B is in contact with the third fire compartment wall 24. The second end 85B of the second fire-resistant material 6B is in contact with the fire partition wall 26.

[0063] On the first surface 82B of the second fire-resistant material 6B, the portion 82D on the first end 84B side contacts the underside of the side beam 73A on the third fire compartment wall 24 side of the second staircase 65. On the first surface 82B of the second fire-resistant material 6B, the portion 82F on the second end 85B side contacts the underside of the side beam 73B on the fire partition wall 26 side of the second staircase 65.

[0064] The fixing structure of the first fire-resistant material 6A will now be described. The first fire-resistant material 6A is attached below the first stair section 45 by a plurality of connecting members 91.

[0065] Multiple connecting members 91 are fixed to the inner surface 54 of one end and the inner surface 55 of the other end of the first stair section 45. Specifically, the fixing portion 91A of the connecting member 91 is fixed to the inner surface 54, 55 of the first stair section 45 by fasteners such as screws or bolts, such as screws and bolts, so that the mounting portion 91B of the connecting member 91 protrudes horizontally from the inner surface 54, 55. The first fire-resistant material 6A is then fixed to the mounting portions 91B of the multiple connecting members 91 attached to the first stair section 45 by fasteners such as screws and bolts. The fixing structure of the second fire-resistant material 6B is substantially the same as the fixing structure of the first fire-resistant material 6A. As described above, the connecting members 91 in the first stair section 45 are arranged in the space S between the first stair section 45 and the fire-resistant material 6. The connecting members 91 in the second stair section 65 are arranged in the space S between the second stair section 65 and the fire-resistant material 6.

[0066] [Fire-resistant structure in stairwells] As shown in Figure 9, the fire-resistant partition wall 26 is positioned between a plurality of first stair sections 45 and a plurality of second stair sections 65 in the stair width direction. The stringer 53B on the fire-resistant partition wall 26 side of the first stair section 45 is in contact with the fire-resistant partition wall 26. The stringer 73B on the fire-resistant partition wall 26 side of the second stair section 65 is in contact with the fire-resistant partition wall 26.

[0067] The fire-resistant partition wall 26 extends from the floor of the first floor to the ceiling of the third floor. The lower end of the fire-resistant partition wall 26 is connected to the foundation 13. The upper end of the fire-resistant partition wall 26 is connected to the roof section 17. The fire-resistant partition wall 26 separates the first stair section 45 and the second stair section 65 in the direction of the stair width.

[0068] Furthermore, as shown in Figure 5, a first firewall 27 and a second firewall 28 are provided on the top floor of the stairwell 3. The first firewall 27 and the second firewall 28 are provided for the following reasons: Up to the floor below the top floor, the first stairwell 31, which includes the first staircase 4, and the second stairwell 32, which includes the second staircase 5, can be separated by fire-resistant material 6, a fire-resistant partition wall 26, a first passageway 41, and a second passageway 61.

[0069] However, the first stairwell 31 and the second stairwell 32 are connected on the top floor. To completely isolate the first stairwell 31 and the second stairwell 32 from each other, a first firewall 27 and a second firewall 28 are provided on the top floor.

[0070] As shown in Figure 5, the first firewall 27 is installed in the first passageway 44 on the top floor, the third floor. The first firewall 27 separates the space of the first passageway 44 on the top floor, the third floor, from the space above the second staircase 67 on the second floor, which extends to the top floor.

[0071] The first firewall 27 is positioned in plan view between the first corridor 44 on the third floor and the second staircase 67 on the second floor, which extends to the top floor.

[0072] One end 27A of the first firewall 27 is connected to the fire partition wall 26. The other end 27B of the first firewall 27 is connected to the first fire compartment wall 22. The upper end of the first firewall 27 is connected to the roof section 17. The lower end of the first firewall 27 is connected to the first passage section 44 on the third floor.

[0073] As shown in Figure 5, the second firewall 28 is installed in the second passageway 64 on the third floor, which is the top floor. The second firewall 28 separates the space of the second passageway 64 on the third floor, which is the top floor, from the space above the first staircase 47 on the second floor, which extends to the top floor.

[0074] The second firewall 28 is positioned in plan view between the second passageway 64 on the third floor and the first staircase 47 on the second floor, which extends to the top floor.

[0075] One end 28A of the second firewall 28 is connected to the fire partition wall 26. The other end 28B of the second firewall 28 is connected to the third fire compartment wall 24. The upper end of the second firewall 28 is connected to the roof section 17. The lower end of the second firewall 28 is connected to the second passage section 64 on the third floor.

[0076] [Stairwell section] As shown in Figure 6, the stairwell 3 is divided into a first stairwell 31, which houses the first staircase 4, and a second stairwell 32, which houses the second staircase 5, by fire-resistant material 6, a fire-resistant partition wall 26, a first passageway 41, a second passageway 61, a first firewall 27, and a second firewall 28. In Figure 6, the area indicated by the black dots represents the first stairwell 31, which houses the first staircase 4.

[0077] [Operation of this embodiment] The operation of this embodiment will now be explained. The first staircase 4 and the second staircase 5 are housed within a single stairwell 3. Fire-resistant material 6 is placed under the first staircase section 45 and under the second staircase section 65, respectively. Since flames rise from below, the fire-resistant material 6 placed under the first staircase section 45 and under the second staircase section 65 suppresses heating by the flames. As a result, the building 1 can prevent the first staircase section 45 and the second staircase section 65 from burning down simultaneously due to heat, thanks to the fire-resistant material 6 placed under the first staircase section 45 and under the second staircase section 65, respectively.

[0078] [Effects of this embodiment] The effects of this embodiment will now be explained. (1) The building 1 comprises a first staircase 4 and a second staircase 5. The first staircase 4 and the second staircase 5 are housed in a single stairwell 3. Fire-resistant material 6 is placed under the first staircase section 45 and under the second staircase section 65, respectively. Since flames rise from below, the fire-resistant material 6 placed under the first staircase section 45 and under the second staircase section 65 suppresses heating by the flames. As a result, the fire-resistant material 6 placed under the first staircase section 45 and under the second staircase section 65 of the building 1 prevents the first staircase section 45 and the second staircase section 65 from burning down simultaneously due to heat.

[0079] (2) The building 1 further includes fire-resistant partition walls 26 positioned between the multiple first stair sections 45 and the multiple second stair sections 65. This prevents the fire from spreading from one of the first stair sections 45 to the other if a fire occurs in one of the second stair sections 65.

[0080] (3) In building 1, the first passageway section 41 and the second passageway section 61 are made of concrete. This prevents the spread of fire from one of the spaces above and below the first passageway section 41 to the other. It also prevents the spread of fire from one of the spaces above and below the second passageway section 61 to the other.

[0081] (4) The building 1 further includes a first firewall 27 and a second firewall 28. The first firewall 27 is provided in the first passageway 44 on the third floor, the top floor. The second firewall 28 is provided in the second passageway 64 on the third floor, the top floor. The stairwell 3 is divided into a first stairwell 31 and a second stairwell 32 by fireproofing material 6, a fireproof partition wall 26, a first passageway 41, a second passageway 61, the first firewall 27, and the second firewall 28. This prevents the spread of fire from one of the first stairwell 31 and the second stairwell 32 to the other. Also, if a fire occurs in one of the first stairwell 45 and the second stairwell 65, it prevents the fire from spreading from one to the other.

[0082] (5) In building 1, the first staircase 4 is configured in a spiral shape in plan view, and the second staircase 5 is configured in a spiral shape in plan view. This makes it possible to reduce the volume occupied by the first staircase 4 in building 1 compared to when the first staircase 4 is not configured in a spiral shape. Also, it makes it possible to reduce the volume occupied by the second staircase 5 in building 1 compared to when the second staircase 5 is not configured in a spiral shape.

[0083] (6) In building 1, the fire-resistant material 6 has a first end 84 and a second end 85. The first end 84 is in contact with the fire compartment wall 21. The second end 85 is in contact with the fire partition wall 26. This prevents flames from entering the space S between the first staircase 45 and the fire-resistant material 6 or the space S between the second staircase 65 and the fire-resistant material 6.

[0084] (7) With respect to the building 1, the fire-resistant material 6 is fixed to the first stair section 45 and the second stair section 65 respectively by connecting members 91. The connecting member 91 in the first stair section 45 is positioned in the space S between the first stair section 45 and the fire-resistant material 6. The connecting member 91 in the second stair section 65 is positioned in the space S between the second stair section 65 and the fire-resistant material 6. This prevents the connecting members 91 from being exposed to flames. In addition, this prevents the fire-resistant material 6 from falling due to deterioration of the connecting members 91 caused by flames.

[0085] <Variation> The above embodiments are illustrative of possible forms of Building 1 and are not intended to limit its form. Building 1 may take forms different from those illustrated in the above embodiments. Examples include forms in which some of the configurations of the embodiments are replaced, modified, or omitted, or forms in which new configurations are added to the embodiments. Modifications of the embodiments are shown below.

[0086] The location of the stairwell 3 in building 1 is not limited to this embodiment. In this embodiment, it was located in the center of building 1, but it may be located at the edge of building 1.

[0087] In building 1 of this embodiment, the first floor is the evacuation floor, but the evacuation floor is not limited to being on the first floor. The evacuation floor may also be on the second floor.

[0088] In this embodiment, the first passage section 41 and the second passage section 61 are located only at the same positions as the floors of each level, but the first passage section 41 and the second passage section 61 may also be provided between each level in the height direction.

[0089] In this embodiment, the fire-resistant material 6 is composed of two fire-resistant boards 81, but the composition of the fire-resistant material 6 is not limited to this. For example, the fire-resistant material 6 may be formed by laminating three or more fire-resistant boards 81.

[0090] This specification discloses the following technologies: [Note 1] Note 1 is a building. The building is a steel-framed building. The building comprises a building body, a stairwell provided in the building body and separated from other rooms by a fire-resistant partition wall, a first staircase provided in the stairwell, and a second staircase provided in the stairwell. The first staircase has a first passage section provided on each floor, and a first staircase section provided in the first passage section on each floor from the evacuation floor to the floor below the top floor. The second staircase has a second passage section provided on each floor, and a second staircase section provided in the second passage section on each floor from the evacuation floor to the floor below the top floor. Viewed from the stair width direction of the first staircase, each of the multiple first staircase sections is arranged to intersect with the second staircase section connecting the same floor as the first staircase section. Fire-resistant material is provided on the underside of the first staircase and the underside of the second staircase.

[0091] [Note 2] The building described in Appendix 1 further comprises fire-resistant partition walls positioned between the multiple first stair sections and the multiple second stair sections.

[0092] [Note 3] In the building described in Appendix 2, the first passageway and the second passageway are made of concrete.

[0093] [Note 4] The building described in Appendix 3 further comprises a first firewall separating the space of the first passage on the top floor from the space above the second staircase extending to the top floor, and a second firewall separating the space of the second passage on the top floor from the space above the first staircase extending to the top floor. The stairwell is divided into a first stairwell containing the first staircase and a second stairwell containing the second staircase by the fireproofing material, the fireproof partition wall, the first passage, the second passage, the first firewall, and the second firewall.

[0094] [Note 5] In the building described in Appendix 1, the first staircase is configured in a spiral shape in plan view. The second staircase is configured in a spiral shape in plan view.

[0095] [Note 6] In the building described in Appendix 2, the first end of the fire-resistant material, which is one end in the stair width direction, is in contact with the fire-resistant partition wall. The second end of the fire-resistant material, which is the other end in the stair width direction, is in contact with the fire-resistant partition wall.

[0096] [Note 7] In the building described in Appendix 1, the fire-resistant material is fixed to the first staircase and the second staircase by connecting members. The connecting member located in the first staircase is positioned in the space between the first staircase and the fire-resistant material. The connecting member located in the second staircase is positioned in the space between the second staircase and the fire-resistant material. [Explanation of symbols]

[0097] S...space, 1...building, 2...building body, 3...stairwell, 4...first staircase, 5...second staircase, 6,6A,6B...fireproof material, 21...fire compartment wall, 26...fire partition wall, 27...first firewall, 28...second firewall, 31...first stairwell, 32...second stairwell, 41...first passage, 45...first staircase, 61...second passage, 65...second staircase, 84,84A,84B...first end, 85,85A,85B...second end, 91...connecting member.

Claims

1. It is a steel-framed building, The building itself, A stairwell provided in the main building and separated from other rooms by a fire-resistant partition wall, A first staircase having a first passage section provided in the stairwell and on each floor, and a first staircase section provided in the first passage section on each floor from the evacuation floor to the floor below the top floor, A second staircase having a second passage section provided in the stairwell and on each floor, and a second staircase section provided in the second passage section on each floor from the evacuation floor to the floor below the top floor, A fire-resistant partition wall is provided between a plurality of the first stair sections and a plurality of the second stair sections, A first firewall separates the space of the first passage on the top floor from the space above the second staircase that extends to the top floor, The system includes a second firewall that separates the space of the second passageway on the top floor from the space above the first staircase extending to the top floor, The first passage section and the second passage section are made of concrete. The first stair section and the second stair section are made of iron material, Viewed from the width direction of the first stair section, each of the multiple first stair sections is arranged to intersect with the second stair section that connects the same floor as the first stair section. Fire-resistant material is placed on the underside of the first staircase and the underside of the second staircase, The stairwell is divided into a first stairwell containing the first staircase and a second stairwell containing the second staircase by the fireproofing material, the fireproof partition wall, the first passageway, the second passageway, the first firewall, and the second firewall. architecture.

2. The first staircase is configured in a spiral shape in a plan view, The second staircase is configured in a spiral shape in a plan view. The building described in claim 1.

3. In the aforementioned fire-resistant material, the first end, which is one end in the direction of the stair width, is in contact with the fire-resistant partition wall. In the aforementioned fire-resistant material, the second end, which is the other end in the stair width direction, is in contact with the fire-resistant partition wall. The building described in claim 1.

4. The fire-resistant material is fixed to the first stair section and the second stair section, respectively, by connecting members. The connecting member located in the first stair section is positioned in the space between the first stair section and the fire-resistant material. The connecting member located in the second staircase is positioned in the space between the second staircase and the fire-resistant material. The building described in claim 1.

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