Staircase structure

Abstract

To simplify a structure in a joining part of a building and an intermediate building side landing by restraining transmission of axial force to the building side in the intermediate building side landing.SOLUTION: In a staircase structure connecting an upper story part 3 and a lower story part 4 and having staircase parts 6 folded back at an outer side landing 5 of a building 1 as an intermediate part thereof connected vertically, an intermediate building side landing 7 is constructed by arranging an upper story side staircase part 61 and a lower story side staircase part 62 adjacently between the upper story side staircase part 61 and the lower story side staircase part 62, and an intermediate beam 7 separating the adjacently arranged staircase parts 6 is provided on the building side landing 7.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a staircase structure in which staircase sections are connected vertically, connecting the upper and lower floors and turning back at a landing on the outside of the building midway. [Background technology]

[0002] For example, an external staircase constructed on the outside of a building is known to have a staircase structure in which upper and lower floors are connected together and the staircase section turns back at a landing on the outside of the building midway (see, for example, Patent Document 1).

[0003] In Patent Document 1, each stair section is constructed with step floor materials and beams that support the step floor materials, and an intermediate building-side landing is constructed between the upper and lower stair sections.

[0004] When constructing the intermediate building-side landing, both the girders in the upper staircase section and the girders in the lower staircase section are provided with horizontal sections extending horizontally, and the upper staircase section and the lower staircase section are arranged adjacent to each other, with the floor of the building-side landing being supported by the horizontal sections of both girders in both staircase sections.

[0005] In addition, the intermediate landing on the building side is equipped with a support beam that connects the horizontal sections of both girders in both adjacent staircase sections, thereby connecting the staircase sections together, and the support beam is attached to a structural member fixed within the wall of the building. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-293263 Summary of the Invention [Problem to be solved by the invention]

[0007] In Patent Document 1, the support beams connecting the staircase sections at the intermediate building landings are connected to the building wall, so the axial force transmitted through the girders in the staircase sections is transmitted to the building via the support beams. For this reason, it is necessary to provide a reinforcing structure against the axial force transmitted to the building at the joints between the buildings and the intermediate building landings, which leads to a complex joint structure.

[0008] In view of this situation, the main objective of the present invention is to provide a staircase structure that can suppress the transmission of axial force to the building at the intermediate building landing, thereby simplifying the structure at the joint between the building and the intermediate building landing, etc. [Means for solving the problem]

[0009] The first characteristic configuration of the present invention is a staircase structure in which a staircase section that connects an upper floor and a lower floor and turns back at an outer landing of a building in the middle is connected up and down, Between the upper staircase section and the lower staircase section, an intermediate building-side landing is constructed by arranging the upper staircase section and the lower staircase section adjacent to each other, The landing on the building side is provided with an intermediate beam that connects adjacent stair sections arranged apart from the building.

[0010] According to this configuration, the building-side landing is equipped with an intermediate beam that connects adjacent stair sections while being spaced apart from the building, so that the axial force of the upper stair section is transmitted to the lower stair section through the intermediate beam, reducing or eliminating the transmission of axial force from the building-side landing to the building. This eliminates the need to provide reinforcement structures against axial force transmitted to the building at the joints between the building and the intermediate building-side landing, simplifying the structure of the joints.

[0011] A second characteristic feature of the present invention is that the building has an intermediate floor corresponding to the building-side landing as a non-landing floor having no floor portion.

[0012] As described above, since the transmission of axial force to the building at the building-side landing can be reduced or eliminated, the intermediate floors in the building corresponding to the building-side landing do not need to be provided with a reinforcement structure against the axial force transmitted to the building, and can be non-landing floors such as atriums. In this way, a suitable staircase structure can be provided for buildings with atriums or the like, in which the transmission of axial force to the building at the intermediate floors is reduced or eliminated.

[0013] A third characteristic feature of the present invention is that the intermediate beam is arranged on the side of the building-side landing that is away from the building.

[0014] With this configuration, the intermediate beam is disposed on the side of the building-side landing that faces away from the building, so the axial force in the upper staircase section can be transmitted to the lower staircase section through the intermediate beam at a location away from the building, thereby more effectively suppressing the axial force in the staircase section from being transmitted to the building.

[0015] A fourth characteristic configuration of the present invention is that the staircase portion is provided with a pair of inner and outer girders as girders supporting the step floor material, The rigidity of the inner stringer is set higher than that of the outer stringer.

[0016] According to this configuration, the rigidity of the inner girders is set higher than that of the outer girders, so the axial force can be concentrated on the inner girders, allowing for efficient transmission of the axial force. Furthermore, at the building landing, the upper and lower staircase sections are arranged adjacent to each other, so the inner girders in the upper staircase section and the inner girders in the lower staircase section are arranged closer to each other. Therefore, the axial force of the inner girders in the upper staircase section can be efficiently transmitted to the inner girders in the lower staircase section through the intermediate beam, more appropriately suppressing the transmission of axial force to the building. [Brief explanation of the drawings]

[0017] [Figure 1]Enlarged perspective view of part of the external staircase [Figure 2] Model diagram showing the staircase structure for the floor staircase [Figure 3] (A) is a side view of the inner girders, and (B) is a side view of the outer girders. [Figure 4] Schematic diagram showing the transmission of axial force in the stepped section DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a staircase structure according to the present invention will be described with reference to the drawings. As shown in Figure 1, this staircase structure is applied to an external staircase 2 installed outside a building 1, and is provided with a staircase section 6 connected to the top and bottom, connecting an upper floor section 3 and a lower floor section 4, and turning back at a landing 5 on the exterior side of the building 1 at the midpoint. Figure 1 shows a portion of the external staircase 2 where an upper staircase section 61 and a lower staircase section 62 are connected, and illustrates an example with two exterior landings 5, one above the other.

[0019] As shown in Figure 1, the external staircase 2 has multiple staircase sections 6 connected vertically, with an intermediate building-side landing 7 between an upper staircase section 61 and a lower staircase section 62. The external staircase 2 is equipped with handrails 10 that are continuous across all of the multiple staircase sections 6 connected vertically.

[0020] As shown in Figure 1, each of the multiple staircase sections 6 is equipped with flooring 8 and a rafter 9 that supports the flooring 8, and by supporting the flooring 8 with the rafter 9, the upper floor section 3, lower floor section 4, external landing 5, building-side landing 7, etc. are constructed.

[0021] As shown in Figure 1, the upper floor section 3 and the lower floor section 4 are provided with stepped step floor materials 81 as floor materials 8. A pair of girders, an inner girder 91 and an outer girder 92, are provided as girders 9 supporting the step floor materials 81. On the upper floor section 3 and the lower floor section 4, both left and right ends of the step floor material 81 are connected to the inner girder 91 and the outer girder 92, and the step floor material 81 is supported by the inner girder 91 and the outer girder 92.

[0022] As shown in Figures 1 and 3(A), the inner slat beam 91 is provided with an inclined portion 91a extending linearly along an oblique direction, a building-side extension portion 91b extending horizontally from the end of the inclined portion 91a on the building side (left side in Figure 3(A)), and an external-side extension portion 91c extending horizontally from the end of the inclined portion 91a on the external side (right side in Figure 3(A)). For example, the external-side extension portion 91c is formed so that its horizontal extension length is longer than that of the building-side extension portion 91b. The shape of the external-side extension portion 91c is formed in an inclined shape with a vertical width that decreases as it moves away from the building 1, as shown in Figure 3(A).

[0023] 1 and 3(B), the outer truss beam 92 includes an inclined portion 92a extending diagonally in a stepped manner, a building-side extension portion 92b extending horizontally from the end of the inclined portion 92a on the building side (left side in FIG. 3(B)), and an outer-side extension portion 92c extending horizontally from the end of the inclined portion 92a on the outer side (right side in FIG. 3(B)). For example, the outer-side extension portion 92c is formed so that its horizontal extension length is longer than that of the building-side extension portion 92b.

[0024] As shown in Figure 3, the inner stringer girder 91 (see Figure 3(A)) is formed so that it is larger in thickness and width in the vertical direction than the outer stringer girder 92 (see Figure 3(B)). As a result, the rigidity of the inner stringer girder 91 is set to be higher than that of the outer stringer girder 92. Incidentally, the relationship in magnitude between the rigidity of the inner stringer girder 91 and the outer stringer girder 92 is set by changing the thickness and width in the vertical direction between the inner stringer girder 91 and the outer stringer girder 92, but it is also possible to change the material that makes up the stringer girder, for example, and it is possible to change how the relationship in magnitude between the rigidity of the inner stringer girder 91 and the outer stringer girder 92 is set as appropriate.

[0025] As shown in Figure 1, the exterior landing 5 is constructed by arranging the upper floor section 3 and the lower floor section 4 of the staircase section 6 adjacent to each other, and is provided with a flat exterior landing floor material 82 as the floor material 8. As shown in Figure 2, the stringers 9 supporting the exterior landing floor material 82 are provided with an exterior extension portion 91c of the inner stringer 91, an exterior extension portion 92c of the outer stringer 92, and a landing stringer 93.

[0026] Figure 2 is a model diagram showing a staircase structure at a location where multiple stair sections 6 are connected together, and illustrates an example with two building-side landings 7, one above the other. In Figure 2, the floor material 8 is shown removed to clearly show the staircase structure, including the braided beams 9, the intermediate beams 51 for the external landings at the external landings 5, and the intermediate beams 75 for the building-side landings at the building-side landings 7, and the shapes of each component, such as the braided beams 9, the intermediate beams 51 for the external landings, and the intermediate beams 75 for the building-side landings, are also shown schematically and may differ from the actual shapes.

[0027] On the exterior landing 5, four exterior extension portions 91c, 92c are provided, in order from the far right side in Fig. 2: an exterior extension portion 92c of the exterior stringer girders 92 on the lower floor 4, an exterior extension portion 91c of the interior stringer girders 91 on the lower floor 4, an exterior extension portion 91c of the interior stringer girders 91 on the upper floor 3, and an exterior extension portion 92c of the exterior stringer girders 92 on the upper floor 3. The landing stringer girders 93 extends at the exterior end (right end in Fig. 2) of the exterior landing 5 in a direction perpendicular to the extension direction of the upper floor 3 and the lower floor 4 (the direction of approaching and receding from the building 1), and the exterior ends of each of the four exterior extension portions 91c, 92c are connected to the landing stringer girders 93.

[0028] As shown in Figures 1 and 2, the exterior landing 5 is provided with an intermediate beam 51 for the exterior landing at a midpoint in the extension direction of the upper floor section 3 and the lower floor section 4. The intermediate beam 51 for the exterior landing is made of, for example, a square steel pipe, and extends in a direction perpendicular to the extension direction of the upper floor section 3 and the lower floor section 4. As shown in Figure 2, the intermediate beam 51 for the exterior landing has a beam central portion 51a arranged between the exterior extension portions 91c of the inner stringer girder 91, and a pair of beam end side portions 51b arranged between the exterior extension portion 91c of the inner stringer girder 91 and the exterior extension portion 92c of the outer stringer girder 92, and is provided across the four exterior extension portions 91c, 92c.

[0029] As shown in Figure 1, the shape of the intermediate beam 51 for the external landing is such that the vertical width is smaller at the end of the external landing 5 in a direction perpendicular to the extension direction of the upper floor 3 and the lower floor 4 than at the center. For example, as shown in the upper part of Figure 1, the vertical width of the beam center portion 51a is formed to be the same width in the direction perpendicular to the extension direction of the upper floor 3 and the lower floor 4, and the vertical width of the beam end portion 51b is formed to be smaller toward the end in the direction perpendicular to the extension direction of the upper floor 3 and the lower floor 4. Incidentally, in Figure 2, the vertical width of the intermediate beam 51 for the external landing is shown as being the same width.

[0030] As shown in Figure 1, the building-side landing 7 is constructed by arranging an upper staircase section 61 and a lower staircase section 62 adjacent to each other, and is provided with a flat building-side landing floor material 83 as floor material 8. As shown in the lower part of Figure 2, the stringer girders 9 supporting the building-side landing floor material 83 are provided with a building-side extension portion 91b of an inner stringer girder 91 and a building-side extension portion 92b of an outer stringer girder 92.

[0031] On the building side landing 7, four building side extension portions 91b, 92b are extended, in order from the back right side of Figure 2: the building side extension portion 92b of the outer truss beam 92 in the upper stair section 61, the building side extension portion 91b of the inner truss beam 91 in the upper stair section 61, the building side extension portion 91b of the inner truss beam 91 in the lower stair section 62, and the building side extension portion 92b of the outer truss beam 92 in the lower stair section 62.

[0032] As shown in Fig. 2, the building-side landing 7 is provided with a landing-side connecting member 71 connected to the building-side end portion of each of the four building-side extension portions 91b, 92b. The landing-side connecting member 71 extends in a direction perpendicular to the extension direction of the upper floor 3 and the lower floor 4, and is connected to the building-side end portion of each of the four building-side extension portions 91b, 92b. The landing-side connecting member 71 is illustrated in Figs. 1 and 2 as a rectangular connecting member, but various types of steel material can be used, for example, structural steel such as H-shaped steel, steel pipes such as square steel pipes, and other steel materials.

[0033] In Figure 2, the exterior wall line L of the building 1 is shown by a dashed dotted line, and the interior side of the building 1 (to the left of the exterior wall line L in Figure 2) is provided with a pair of left and right columns 11 and building side beams 12 that connect the columns 11 together. The building side beam 12 on the building 1 side and the landing side connecting member 71 of the building side landing 7 are connected by first to third connecting members 72-74. The first to third connecting members 72-74 extend along the extension direction of the upper floor 3 and the lower floor 4, and are arranged at intervals in a direction perpendicular to the extension direction of the upper floor 3 and the lower floor 4.

[0034] 2, the column 11 is illustrated as an H-shaped steel beam or the like, but various steel materials such as square steel pipes can also be used. The building side beams 12, landing side connecting member 71, and first to third connecting members 72-74 are illustrated as rectangular connecting members, but various steel materials such as H-shaped steel beams, square steel pipes, and the like can also be used.

[0035] As shown in Fig. 1, an intermediate beam 75 for the building-side landing is provided at a midpoint of the building-side landing 7 in the extension direction of the upper floors 3 and the lower floors 4, spaced apart from the building 1. As shown in Fig. 2, the intermediate beam 75 for the building-side landing extends in a direction perpendicular to the extension direction of the upper floors 3 and the lower floors 4. As shown in the building-side landing 7 at the bottom of Fig. 2, the intermediate beam 75 for the building-side landing has a beam central portion 75a disposed between the building-side extension portions 91b of the inner stringer girders 91, and a pair of beam end portion side portions 75b on the left and right disposed between the building-side extension portion 91b of the inner stringer girders 91 and the building-side extension portion 92b of the outer stringer girders 92, and is provided across the four building-side extension portions 91b, 92b.

[0036] Below, we will explain how the axial force is transmitted in the stair section 6 by adopting the above-mentioned stair structure, based on Figure 4. Figure 4 is a schematic diagram showing the building 1, the inner and outer braided girders 91 and 92 in the stair section 6, the intermediate beam 51 in the external landing 5, the intermediate beam 75 in the building-side landing 7, etc.

[0037] As shown by the thick arrows, the axial force in the upper staircase section 61 is transmitted downward through the first inner stringer 91A and the first outer stringer 92A in the upper floor section 3, and then transmitted to the exterior landing 5. The axial force transmitted to the exterior landing 5 is transmitted from the first inner stringer 91A and the first outer stringer 92A in the upper floor section 3 to the second inner stringer 91B and the second outer stringer 92B in the lower floor section 4 by the exterior landing intermediate beam 51. In this way, by providing the exterior landing intermediate beam 51, in the upper staircase section 61, the axial force in the upper floor section 3 is transmitted to the lower floor 4 in a manner that is folded back by the exterior landing intermediate beam 51 at the exterior landing 5.

[0038] The axial force transmitted to the lower floor 4 is transmitted downward through the second inner stringer girder 91B and the second outer stringer girder 92B on the lower floor 4, as shown by the thick arrows, and is transmitted to the building-side landing 7. The axial force transmitted to the building-side landing 7 is transmitted by the intermediate beam 75 for the building-side landing from the second inner stringer girder 91B and the second outer stringer girder 92B on the upper staircase section 61 to the third inner stringer girder 91C and the third outer stringer girder 92C on the upper floor 3 on the lower staircase section 62. In this way, by providing the intermediate beam 75 for the building-side landing, the axial force on the upper staircase section 61 is transmitted to the lower staircase section 62 in a manner that is folded back by the intermediate beam 75 for the building-side landing.

[0039] As shown by the thick arrows, the axial force in the lower staircase section 62 is transmitted downward through the third inner girders 91C and the third outer girders 92C in the upper floor section 3, and then transmitted to the exterior landing 5. The axial force transmitted to the exterior landing 5 is transmitted from the third inner girders 91C and the third outer girders 92C in the upper floor section 3 to the fourth inner girders 91D and the fourth outer girders 92D in the lower floor section 4 by the exterior landing intermediate beam 51. In this way, by providing the exterior landing intermediate beam 51, the axial force in the upper floor section 3 is transmitted to the lower floor 4 in the same manner as in the upper staircase section 61, in the lower staircase section 62, by being folded back by the exterior landing intermediate beam 51 at the exterior landing 5.

[0040] At the building-side landing 7, the axial force at the upper staircase section 61 is transmitted to the lower staircase section 62 through the intermediate beam 75, reducing or eliminating the transmission of axial force to the building 1 at the building-side landing 7. In this way, since the transmission of axial force to the building 1 at the building-side landing 7 can be reduced or eliminated, as shown in FIG. 4, the intermediate floor in the building 1 corresponding to the building-side landing 7 (the area surrounded by the dotted line in FIG. 4) does not need to be provided with a reinforcement structure or the like against the axial force transmitted to the building 1. Therefore, the intermediate floor in the building 1 corresponding to the building-side landing 7 can be made a non-landing floor, such as an open-air floor, without providing a highly rigid concrete floor 13 or the like.

[0041] Figure 4 shows a case in which a highly rigid concrete floor 13 is provided on the upper floor corresponding to the upper end of the upper staircase section 61 and on the lower floor corresponding to the lower end of the lower staircase section 62 in a building 1, and the upper and lower floors are used as landing floors.

[0042] Although Fig. 4 shows an example in which one building-side landing 7 is provided, it is also possible to provide multiple building-side landings 7 in a row in the vertical direction, as shown in Fig. 2. Even in this case, by providing intermediate beams 75 for the building-side landings 7 on the building-side landings 7, it is possible to reduce or eliminate the transmission of axial force to the building 1 at each of the multiple building-side landings 7, so that non-landing floors such as atriums can also be provided in a row.

[0043] 1 and 2, the building-side landing 7 is provided with an intermediate beam 75 for the building-side landing, and the intermediate beam 75 is arranged on the side away from the building 1, such as the end of the building-side landing 7 on the side away from the building 1. This allows the point at which the axial force is transmitted by the intermediate beam 75 to be a point away from the building 1, effectively preventing the axial force in the staircase section 6 from being transmitted to the building 1.

[0044] The staircase section 6 is provided with a pair of stringers, an inner stringer 91 and an outer stringer 92, and as shown in Figure 3, the rigidity of the inner stringer 91 is set higher than that of the outer stringer 92, so that the axial force can be transmitted in a concentrated manner at the inner stringer 91. At the building-side landing 7, as shown in Figures 1 and 2, the inner stringer 91 in the upper staircase section 61 and the inner stringer 91 in the lower staircase section 62 are arranged closer to each other, so that the axial force transmitted in a concentrated manner can be efficiently transmitted from the inner stringer 91 in the upper staircase section 61 to the inner stringer 91 in the lower staircase section 62 at the intermediate beam 75 for the building-side landing, and the transmission of the axial force to the building 1 side can be appropriately suppressed.

[0045] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

[0046] (1) In the above embodiment, the intermediate beam 51 for the external landing and the intermediate beam 75 for the building landing are illustrated as being made of square steel pipes, but they may also be made of various steel materials, such as other steel pipes such as circular steel pipes and H-shaped steel beams, without being limited to square steel pipes.

[0047] (2) In the above embodiment, an example was given of a case in which a pair of girders, an inner girder 91 and an outer girder 92, are provided as the girders 9 supporting the step floor material 81 in the upper floor section 3 and the lower floor section 4 of the staircase section 6. However, for example, it is also possible to arrange a single girder in the central part of the upper floor section 3 and the lower floor section 4 to support the step floor material 81, and the way in which the girders are provided can be changed as appropriate. [Explanation of symbols]

[0048] 1. Building 3 Upper floors 4 Lower floor 5. Exterior landing 6 Stairs 7 Building side landing 9 digits 75 Intermediate beam for building side landing 81 Tier flooring material 91 Inner slat beam 92 Outer girders

Claims

1. In a staircase structure in which the upper floor and the lower floor are connected and the staircase section turns back at the landing on the outside of the building, Between the upper staircase section and the lower staircase section, an intermediate building-side landing is constructed by arranging the upper staircase section and the lower staircase section adjacent to each other, A staircase structure in which the building-side landing is provided with an intermediate beam that connects adjacent stair sections arranged away from the building.

2. 2. The staircase structure according to claim 1, wherein the building has an intermediate floor corresponding to the landing on the building side as a non-landing floor having no floor portion.

3. The staircase structure according to claim 1 or 2, wherein the intermediate beam is arranged on the side of the building-side landing that is away from the building.

4. The staircase section is provided with a pair of inner and outer girders as girders supporting the step floor material, 3. The staircase structure according to claim 1, wherein the rigidity of the inner girders is set higher than that of the outer girders.

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