JP7202173B2 - stair structure - Google Patents

Description

The present invention relates to a stair structure.

In a building such as a residence, the lower staircase for ascending and descending the first and second floors of the building and the upper staircase for ascending and descending between the second and third floors of the building are parallel and vertical. There is one that is arranged so as to be (see, for example, Patent Document 1). In this type of staircase, each staircase is composed of a straight staircase portion and a circular staircase portion connected to the lower side of the straight staircase portion, thereby suppressing the expansion of the occupied area of the staircase and suitably reducing the pressure on the living space.

JP 2006-307565 A

As described above, when the staircase is divided into the straight stair section and the circular stair section, the strength of the entire staircase can be improved by connecting the diagonal force girder for the straight stair section and the horizontal force girder for the circular stair section. I can expect it. However, in such a configuration, the following phenomenon may occur by increasing the number of steps of the winding staircase from the viewpoint of improving convenience. That is, by extending the horizontal force girder of the upper staircase toward the boundary between the straight staircase portion and the circular staircase portion, the horizontal force girder can easily protrude toward the ascending/descending space side of the lower staircase with respect to the oblique force girder. Local narrowing of the ascending/descending space due to the overhang of the horizontal force girder may cause a feeling of oppression overhead when using the lower stairs. As described above, the structure of the multi-story staircase still has room for improvement in terms of reducing the oppressive feeling in the ascending/descending space.

The present invention has been made in view of the above circumstances, and a main object thereof is to reduce the oppressive feeling in the lift space.

Means effective for solving the above problems will be described below, showing effects and the like as necessary. In the following description, for ease of understanding, corresponding configurations in the embodiments of the invention are appropriately shown in parentheses or the like, but are not limited to the specific configurations shown in parentheses or the like.

Means 1. In a multi-story building (building 10), upper stairs (upper stairs 52) on the upper floor side and lower stairs (lower stairs) on the lower floor side are provided on the upper floor side and the lower floor side that are vertically adjacent to each other. 51), and a staircase structure applied to a multistory staircase (multistory staircase 50) in which the upper and lower stairs are arranged at a position where they overlap vertically,
The upper staircase has a straight staircase portion (straight staircase portion 61U) extending linearly and a circular staircase portion (circular staircase portion 71U) connected to the lower side of the straight staircase portion,
The round stair portion has a round stair portion force girder (horizontal force girder 72U) that extends in the horizontal direction and supports at least the first step round stair portion tread plate of a plurality of round stair portion tread plates (tread plates 73U). ,
The straight staircase is
A force girder for a straight staircase extending in an oblique direction (diagonal force girder 63U),
a tread plate support plate (support frame 66U) that is fixed to the straight stair portion force girder and supports the straight stair portion tread plate (tread plate 64U);
The force girder for the straight stair portion extends below the tread plate for the straight stair portion positioned at the lowest step in the straight stair portion,
A staircase structure, wherein the force girder for the straight stair portion and the force girder for the circular stair portion are connected.

It is advantageous to divide the upper floor staircase into a plurality of blocks of a straight staircase portion and a circular staircase portion, for example, in order to improve work efficiency at a construction site. Further, by connecting the force girder of the straight stair portion and the force girder of the circular stair portion, it is possible to preferably solve the concern about the strength when the stair is divided into blocks. However, if it is attempted to simply connect the diagonally extending straight staircase force girder and the horizontally extending circular staircase force girder near the boundary (boundary BL1) between the two blocks, A gap in the vertical direction is created between the force girder for stairs. Although such a gap can be eliminated by interposing an intermediate member such as a connecting plate, it is assumed that the connecting portion of the double-strand girder tends to protrude toward the ascending/descending space side of the stairs on the lower floor. In this respect, as shown in this means, if the straight staircase force girder is extended from the lowest step of the straight staircase portion and then the straight staircase force girder and the circular staircase force girder are connected, The connecting portion can be kept as far away from the boundary as possible toward the lower stage. As a result, it is possible to reduce the overhang toward the elevating space. This is preferable for reducing the oppressive feeling in the elevator space.

Means 2. The straight staircase force girder has a lower end portion (end portion 69U) extending below the first-step circular staircase tread plate, and the straight staircase force girder and The staircase structure according to means 1, wherein the connecting portion with the power beam for the round stair portion is positioned below the tread plate for the first step round stair portion.

As shown in means 2, the end of the straight staircase force girder is extended below the tread plate for the first step, and then both force girders are connected below the tread plate. Thus, the effect shown in means 1 can be favorably exhibited.

Means 3. The tread support plate is a tread support plate for straight stairs,
The round stair portion is fixed to the round stair portion force girder, and supports a round stair portion tread plate other than the first round stair portion tread plate among the plurality of round stair portion tread plates. having a plate (support frame 74U),
A connection portion between the straight staircase force girder and the spiral staircase force girder is located below the spiral staircase tread plate positioned at the highest step among the plurality of spiral staircase tread plates. The staircase structure according to means 2, characterized in that the staircase structure is arranged at a position closer to the tread plate for the round stair part, which is one lower than the staircase structure.

As shown in this means, by arranging the connecting portion below the uppermost round stair step tread plate, the round stair step tread plate support plate can be passed vertically. As a result, the force applied to the treads in ascending and descending the stairs can be transmitted straight to the force girder for the stairs (horizontal force girder), contributing to the improvement of the support strength. Here, if the connecting portion is arranged below the uppermost round stair step tread plate and closer to the lower step, it may be difficult to secure the fixing portion of the round stair step tread plate support plate. . In this respect, since the force transmission path is straight as described above, the downsizing of the stair tread support plate can be facilitated, so that the connecting portion and the stair tread support plate can be preferably coexisted.

The configuration shown in this means is defined as "the tread plate support plate is a straight stair tread plate support plate, the circular stair section is fixed to the circular stair section support girder, and one of the plurality of circular stair section tread boards is fixed. It has a tread plate support plate (support frame 74U) for the round stair portion that supports the tread plates for the round stair portion other than the tread plates for the round stair portion, and the connecting portion between the force girder for the straight stair portion and the power girder for the round stair portion. is a tread plate for the straight stair portion that is positioned below the tread plate for the round stair portion that is positioned at the highest step among the plurality of tread plates for the round stair portion and that is positioned at the lowest step in the straight stair portion; The staircase structure according to means 2, characterized in that the staircase structure is arranged at a position nearer to the treadplate for the staircase section one step below the upper step." .

Means 4. A lower end portion (end portion 69U) of the force girder for the straight stair portion and an end portion (end portion 79U) of the force girder for the curved stair portion on the straight stair portion side (upper step side) are connected. The staircase structure according to any one of means 1 to 3.

According to the means 4, the end portions of the force girder for the straight stair portion and the force girder for the circular stair portion are connected to each other, and by suppressing the extension of the force girder beyond the connecting portion, the elevating space side shown in the means 1 It is possible to suitably suppress the overhang of the force girder to.

Means 5. The staircase structure according to means 4, wherein the power girder for the round stair portion does not extend toward the straight stair portion from a connecting portion between the power girder for the straight stair portion and the power girder for the round stair portion.

By connecting the end of the straight staircase force girder and the end of the spiral staircase force girder and avoiding the extension of the spiral staircase force girder to the upper tier side from the connecting portion, it is shown in means 1. It is possible to suitably suppress the overhang of the power girder for the winding stair section toward the elevator space side.

In addition, the configuration shown in this means is defined as "the power girder for the round stair section is formed so as not to protrude toward the straight stair section beyond the extension line of the power girder for the straight stair section and the straight stair section strength girder. The staircase structure according to any one of means 1 to 3, characterized in that

Means 6. The tread support plate is a tread support plate for straight stairs,
The round stair portion is fixed to the round stair portion force girder, and supports a round stair portion tread plate other than the first round stair portion tread plate among the plurality of round stair portion tread plates. having a plate (support frame 74U),
The staircase structure according to any one of means 1 to 5, wherein the tread plate support plate for the circular staircase overlaps the force girder for the straight staircase in the width direction of the upper staircase.

As shown in Means 6, if a structure (offset arrangement) in which the tread plate support plate for the round stair portion and the force girder for the straight stair portion overlap in the width direction of the upper staircase, the top stair can be rotated in a limited area. While coexisting the circular stair tread support plate corresponding to the stair tread and the force girder for the straight stair, it is possible to suitably realize securing of support strength by the support plate and suppression of overhanging into the ascending/descending space.

Means 7. The mounting location of the tread plate support plate for the circular stair section on the force girder for the circular stair section is the central side in the width direction of the upper stair with respect to the connecting portion between the force girder for the circular stair section and the force girder for the straight stair section. The staircase structure according to means 6, characterized in that it is arranged at a position where

In the case of the offset arrangement shown in Means 6, the mounting location of the tread plate support plate for the round stair portion with respect to the power girder for the round stair portion is the upper floor with respect to the connecting portion between the power girder for the round stair portion and the power girder for the straight stair portion. By setting the position on the central side in the width direction of the stairs, it is possible to suitably improve the support strength of the treads by the support plate while suppressing the protrusion into the ascending/descending space.

Means 8. The power girder for the circular staircase is arranged along the outer portion of the circular staircase in the circular direction of the circular staircase,
The straight stair portion has a first force girder (strength girder 63U) on one end side in the width direction of the straight stair portion as a force girder for the straight stair portion, and a second force girder (strength girder 62U) on the other end side. wherein the first force girder is provided on the same side as the force girder for the surrounding staircase,
The staircase structure according to any one of means 1 to 7, characterized in that the first force girder extends further downward than the second force girder in the vertical direction of the straight staircase. .

By using the first force girder and the second force girder together as shown in means 8, it is possible to suitably improve the supporting strength of the treads in the straight staircase portion. Here, between the inner side and the outer side in the rotation direction, the outer side has a gentler step change. Therefore, if the first force girder provided on the outside is extended and connected to the force girder for the circular stair portion, the connection shown in means 1 can be easily realized.

Means 9. The tread plate support plate is a tread plate support plate for a straight staircase,
The round stair portion is fixed to the round stair portion force girder, and supports a round stair portion tread plate other than the first round stair portion tread plate among the plurality of round stair portion tread plates. having a plate (support frame 74U),
a connecting member that connects the lower end of the second force girder and the intermediate portion of the first force girder,
The staircase structure according to means 8, wherein the uppermost one of the plurality of tread plates for the staircase is supported by the treadplate support plate for the staircase and the connecting member. .

By connecting the straight staircase force girders (the first force girder and the second force girder) arranged on both sides of the straight staircase with connecting members, the supporting strength of the treads in the straight staircase can be improved. If the connecting member is configured to support the tread plate for the round stair portion positioned at the uppermost step, the support strength of the tread plate can be improved, and the arrangement of the power girder for the round stair portion shown in means 8 can be favorably promoted. can.

Schematic of the building in one embodiment. The perspective view which shows the structure of a building unit. A plan view of a multistory staircase. FIG. 4 is a partial cross-sectional view taken along the line AA of FIG. 3; FIG. 4 is a partial cross-sectional view taken along line BB of FIG. 3; FIG. 4 is a partial cross-sectional view showing a connecting portion of a straight staircase portion and a circular staircase portion in a lower staircase; FIG. 4 is a partial cross-sectional view showing a connecting portion of a straight staircase portion and a circular staircase portion in an upper floor staircase;

An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 3. FIG. In this embodiment, the staircase structure of the present invention is embodied in a three-story unit building. 1 is a schematic diagram of a building 10, FIG. 2 is a perspective view showing the construction of a building unit 30, and FIG.

As shown in FIG. 1, the building 10 has a three-story building body 11 provided on a foundation and a roof. A first floor portion 21, a second floor portion 22, and a third floor portion 23 of the building body 11 are all constructed by combining a plurality of building units 30. - 特許庁The building unit 30 includes pillars 31 arranged at the four corners, ceiling girders 32 connected to the upper ends (upper joints) of the pillars 31, and floor girders 33 connected to the lower ends (lower joints) of the pillars 31. These pillars 31, ceiling girders 32, and floor girders 33 form a rectangular parallelepiped framework (unit framework) (see FIG. 2). A plurality of small ceiling girders 34 are bridged at predetermined intervals between a pair of ceiling girders 32 that constitute the long sides (girders) of the building unit 30, and the ceiling girders 34 support ceiling panels 36. Supported. A plurality of floor girders 35 are bridged at predetermined intervals between the pair of floor girders 33 forming the long sides of the building unit 30, and the floor girders 37 are supported by the floor girders 35. ing.

Returning to the description of FIG. 1, the building 10 includes three vertically stacked building units 30, specifically a building unit 30A for the first floor portion 21, a building unit 30B for the second floor portion 22, and three building units 30B. A staircase space 15 is formed so as to straddle the building unit 30C for the floor portion 23. - 特許庁The stairway space 15 is defined by a pair of walls 17 and 18 facing each other across the stairway space 15 (see FIG. 3). Openings 19 are formed in the wall portion 17 functioning as a partition from the living room space 16 , and access to the staircase space 15 is possible through these openings 19 .

The stair space 15 is provided with a lower staircase 51 connecting the first floor portion 21 and the second floor portion 22, and an upper floor staircase 52 connecting the second floor portion 22 and the third floor portion 23.例文帳に追加The lower staircase 51 and the upper staircase 52 have the same length and orientation, and are arranged vertically and parallel to each other. Therefore, when moving from the first floor portion 21 to the third floor portion 23, it is necessary to pass through the lower floor stairs 51→living room space 16 (second floor portion 22)→upstairs stairs 52, and from the third floor portion 23 to the first floor. When moving to the portion 21 , it is necessary to pass the upper floor stairs 52 →room space 16 (second floor portion 22 ) →lower floor stairs 51 . By aligning the arrangement of the lower floor stairs 51 and the upper floor stairs 52, it is advantageous in terms of shortening the lead wires when going up and down the stairs and suppressing pressure on the living space.

In the multi-story staircase (hereinafter referred to as multi-story staircase 50), the basic structure of the lower staircase 51 and the upper staircase 52 is mostly shared. Hereinafter, the basic configuration of both the stairs 51 and 52 will be described with reference to FIGS. 3 to 5, and then the configurations relating to the differences between the two stairs will be described individually. 4 is a partial cross-sectional view of the multi-layered staircase 50 (a partial cross-sectional view taken along line AA in FIG. 3), and FIG. 5 is a partial cross-sectional view of the multi-layered staircase 50 (a partial cross-sectional view along the line BB in FIG. 3). In addition, in FIG. 5, illustration of a part of the configuration is omitted or simplified for the sake of convenience.

As shown in FIG. 3, the lower staircase 51 and the upper staircase 52 have a straight staircase portion 61 extending linearly in the ascending/descending direction, and are connected to the upper and lower sides of the straight staircase portion 61 so that the ascending/descending direction is a plane. It is divided into three blocks (units) with the circular staircase portions 71 and 81 that change by 90 degrees when viewed. A lower staircase 51 and an upper staircase 52 are constructed by integrating these three blocks at the construction site.

The straight staircase portion 61 includes a pair of force beams 62 and 63 extending obliquely along each edge (the wall portions 17 and 18) in the width direction of the straight step portion 61, and the force beams 62 and 63. It has a plurality of treads 64 arranged so as to span over 63 . As shown in FIG. 4, the force girders 62 and 63 are made of rectangular steel pipes having a rectangular cross section intersecting the elevation direction, and are arranged side by side at the same height so that the side portions face each other. Vertically extending support frames 65 and 66 are fixed to the side surfaces of the force beams 62 and 63 that are not opposed to each other.

The upper ends of both support frames 65 and 66 protrude above the upper surfaces of the force beams 62 and 63, and a base frame 67 for the tread plate 64 is provided so as to span the upper ends. By fixing the base frame 67 to the support frames 65 and 66 , the footboard 64 is supported by the force beams 62 and 63 .

The positional relationship between the force beams 62 and 63 and the support frames 65 and 66 may be reversed inside and out, and the support frames 65 and 66 may be fixed to the side surfaces of the force beams 62 and 63 facing each other.

A riser 68 is arranged between the treads 64 so as to cover the gap between the treads 64 . The riser plate 68 is fixed to the base frame 67 in a state in which the upper end portion of the riser plate 68 is inserted into a recess formed in the lower surface of the upper footboard 64 . These risers 68 prevent the base frame 67 and the support frames 65 and 66 from being exposed.

Here, with reference to FIGS. 3 and 6(a), the winding staircase portions 71 and 81 will be described. FIG. 6(a) is a partial cross-sectional view (partial cross-sectional view taken along the line CC of FIG. 3) of the winding staircase portion 71. FIG.

As shown in FIG. 3, the lower winding staircase portion 71 is arranged along the wall portion 18 located outside in the winding direction of the winding staircase portion 71 (having a substantially L shape in plan view). and a plurality of (three in the present embodiment) treads 73 supported by the force beam 72 . The force girder 72 shown in the present embodiment extends in the horizontal direction, and the stepboard 73 of the first stage is directly fixed to the force girder 72, whereas the stepboards 73 of the second and third stages It is fixed to the force girder 72 via a support frame 74 .

Specifically, the force girder 72 is made of a square steel pipe like the force girder 63 of the straight step portion 61, and a vertically extending support frame 74 is fixed to the side surface facing inward in the circumferential direction. The support frame 74 protrudes upward from the upper surface of the force girder 72, and a base frame 75 for the footboard 73 is arranged so as to rest on the protruding portion. By fixing the base frame 75 to the support frame 74 , the footboard 73 is supported by the force girder 72 .

The upper winding staircase portion 81 has the same basic configuration as the lower winding staircase portion 71 . Specifically, the upper round staircase portion 81 has a force girder 82 (having a substantially L shape in plan view) disposed along the wall portion 18 located outside in the rounding direction of the round staircase portion 81 . and a plurality of treads 83 supported by the force girder 82 . The force girder 82 shown in the present embodiment extends in the horizontal direction, and the first step tread 83 is directly fixed to the force girder 82, whereas the second and third step treads 83 It is fixed to the force girder 82 via the support frame 84 .

Like the force girder 72, the force girder 82 is made of a square steel pipe, and a support frame 84 extending vertically is fixed to the side surface facing inward in the circumferential direction. The support frame 84 protrudes upward from the upper surface of the force girder 82, and a base frame 85 for the footboard 83 is arranged so as to rest on the protruding portion. By fixing the base frame 85 to the support frame 84 , the footboard 83 is supported by the force girder 82 .

The lower staircase 51 and the upper staircase 52 are provided between a tread plate 64 positioned at the lowest step on the straight stair portion 61 side and a tread plate 73 positioned at the uppermost step on the circular stair portion 71 side. It is divided on the basis of a plate 68, and the arrangement position of the riser plate 68 is the boundary (boundary BL1) between the straight staircase portion 61 and the circular staircase portion 71. As shown in FIG.

In this embodiment, the connecting structure of the straight staircase portion 61 and the circular staircase portions 71 and 81 described in detail above is different between the lower staircase 51 and the upper staircase 52 . First, with reference to FIGS. 5 and 6, the connection structure of the lower stairs 51 will be described. In the following description, the power girders 62 and 63 on the straight stair portion 61 side are referred to as "diagonal power girders 62 and 63", and the power girders 72 and 82 on the circular stair portion 71 and 81 side are referred to as "horizontal power girders 72 and 82". ”. In addition, "L" is attached to various configurations belonging to the lower staircase 51, and "U" is attached to various configurations belonging to the upper staircase 52 to distinguish them.

The straight staircase portion 61L and the circular staircase portions 71L, 81L, which constitute the lower staircase 51, are connected by connecting plates 58L, 58L and 72L, respectively. 59L. Specifically, as shown in FIG. 6, both the lower end 69L of the diagonal force girder 63L and the upper end 79L of the horizontal force girder 72L are located on the boundary BL1 between the two blocks. The height position is shifted up and down. More specifically, the end 69L of the diagonal force girder 63L is located above the end 79L of the horizontal force girder 72L. A connecting plate 58L is arranged so as to connect these ends 69L and 79L, and the respective ends 69L and 79L are fixed to the connecting plate 58L using fasteners such as bolts and nuts, so that the oblique force is reduced. The girder 63L and the horizontal force girder 72L are connected. As a result, the straight staircase portion 61L and the circular staircase portion 71L are integrated.

Although the illustration is simplified in FIG. 5, the same applies to the connection structure between the straight staircase portion 61L and the upper circular staircase portion 81L. That is, although the upper end of the diagonal force girder 63L and the lower end of the horizontal force girder 72L are both positioned on the boundary between the two blocks, their height positions are displaced vertically. The oblique force girder 63L and the horizontal force girder 72L are connected via a connection plate 59L arranged so as to connect the parts. As a result, the straight staircase portion 61L and the circular staircase portion 81L are integrated.

The horizontal force girders 72L, 82L are fixed to the above-described building unit 30 (for example, the floor beam 35, etc.). It is installed in the building unit 30 . Incidentally, in this installed state, the diagonal force girder 62L of the straight staircase portion 61L is also fixed to the building unit 30 (for example, a stud).

Here, for example, assuming that the connection structure between the straight staircase portion 61L and the lower circular staircase portion 71L in the lower staircase 51 is applied as it is to the upper staircase 52, the connecting portion to the ascending/descending space side for the lower staircase is will protrude (see FIG. 6). For this reason, in order to secure as large an elevating space as possible, when the surface material for the ceiling under the stairs is arranged so as to be close to the diagonal force girder 63U (specifically, the lower surface portion thereof) of the straight staircase portion 61U, Protrusions or the like may occur on the face material near the connecting portion. The existence of such a convex portion can be a factor in giving a feeling of oppression during ascending and descending. In the upper staircase 52 shown in the present embodiment, the connection structure between the straight staircase portion 61U and the upper circular staircase portion 81U in the upper staircase 52 is the same as that of the lower staircase 51 (see FIG. 5). One of the features is that the connecting structure between the straight staircase portion 61U and the lower circular staircase portion 71U is devised to eliminate the above inconvenience. The connection structure between the straight staircase portion 61U and the lower circular staircase portion 71U will be described below with reference to FIG.

In the lower staircase 51, the two diagonal force girders 62L and 63L have the same length, whereas in the upper staircase 52 the two diagonal force girders 62U and 63U have different lengths. Specifically, the diagonal force girder 63L connected to the horizontal force girder 72U of the round stair portion 71U is longer than the other diagonal force girder 62L, and straddles the boundary BL1 with the round stair portion 71U. It extends to the side of the winding staircase portion 71U. Specifically, the diagonal force girder 63L is longer by this extension, and the end portion 69U of the force girder 63U is extended so as to be positioned below the third tread plate 73U in the lower round staircase portion 71U. out. The upper end portion 79U of the horizontal force girder 72U is also located below the third step tread 73U, and the diagonal force girder 63U and the horizontal force girder 72U are directly connected below the tread 73U. .

Specifically, a notch is formed in an end portion 79U (specifically, an upper surface portion) of the horizontal force girder 72U, and an end portion 69U of the oblique force girder 63U is inserted into this notch. By fastening the overlapped ends 69U and 79U to each other with fasteners such as bolts and nuts, both the girders 63U and 72U are connected to each other. As such a connection structure, if the two force beams 63U and 72U are integrated, the strength of the upper staircase 52U can be preferably increased.

In addition, the specific configuration for directly connecting both force beams 63U and 72U is arbitrary. For example, it is also possible to connect both force beams 63U and 72U by welding. In addition, a notch for insertion is formed in the horizontal force girder 72U of the round stair portion 71U, but a notch is provided in the diagonal force girder 63U of the straight stair portion 61U, and the horizontal force girder 72U is inserted into the notch. It is also possible to

According to the embodiment detailed above, the following excellent effects are obtained.

By dividing the lower floor staircase 51 and the upper floor staircase 52 into a straight staircase portion 61 and a circular staircase portion 71 so that both can be assembled at the construction site, work efficiency at the construction site can be improved. Further, by connecting the diagonal force girder 63U of the straight staircase portion 61U and the horizontal force girder 72U of the circular staircase portion 71U, it is possible to solve the problem of strength when the upper staircase 52 is divided into blocks. However, if it is attempted to simply connect the diagonal force girder 63U and the horizontal force girder 72U near the boundary BL1 of both blocks, a gap in the vertical direction occurs between the diagonal force girder and the horizontal force girder (Fig. 4). Although such a gap can be eliminated by interposing an intermediate member such as a connecting plate, it is assumed that the connecting portion of the double-strand girder tends to protrude toward the ascending/descending space side of the lower floor stairs 51 . In this regard, as shown in the present embodiment, the diagonal force girder 63U is extended from the lowest step of the straight step portion 61U, and then the diagonal force girder 63U and the horizontal force girder 72U are directly connected. , the connecting portion can be kept as far away from the boundary BL1 as possible to the lower stage side. As a result, it is possible to reduce the overhang toward the elevating space. This is preferable for reducing the oppressive feeling in the elevator space.

In addition, by arranging the connecting portion below the tread plate 73U for the winding staircase 71U located at the uppermost step, the support frame 74U for the winding staircase 71U can be passed vertically. As a result, the force applied to the treads in ascending and descending stairs can be transmitted straight to the horizontal force girder 72U, contributing to an improvement in support strength. Here, if the connecting portion is arranged below the uppermost footboard 73U and closer to the lower step, it may become difficult to secure the fixing portion of the support frame 74U in the horizontal force girder 72U. In this regard, since the transmission path of force is straight as described above and the downsizing of the support frame 74U can be facilitated, the connection structure and the support frame 74U can preferably coexist.

If the diagonal force beams 62U and 63U are used together as force beams for the straight step portion 61U, the support strength of the treads 64U in the straight step portion 61U can be preferably improved. Here, between the inner side and the outer side in the rotation direction, the outer side has a gentler step change. Therefore, if the oblique force girder 63U provided on the outside is extended and connected to the horizontal force girder 72U for the round stair portion, the connection portion can be easily moved to the lower side (side of the round stair portion 71U). can be realized.

It should be noted that the present invention is not limited to the contents described in the above-described embodiment, and may be implemented as follows, for example. Incidentally, the configurations of the following different forms may be applied individually to the configurations of the above embodiments, or may be applied in combination with each other.

In the upper staircase 52 shown in the above embodiment, the diagonal force girder 63U of the straight staircase portion 61U and the horizontal force girder 72U of the spiral staircase portion 71U are arranged below the footboard 73U located at the top of the staircase portion 71U. connected with. This connecting portion is largely biased so that the uppermost tread plate 73U is closer to the tread plate 73U, which is one step lower than the uppermost tread plate 73U, but the connection portion is not limited to this. It suffices if it is positioned at least below the footboard 73U positioned at the top. However, in order to reduce the overhang of the lower staircase 51 into the ascending/descending space, it is preferable that the lowermost tread plate 64U of the straight staircase portion 61U and the tread plate 73U one level below be closer to the latter.

・By connecting the intermediate portion of the diagonal force girder 62U and the lower end of the diagonal force girder 63U using a connecting member (for example, a connection plate) extending in the width direction of the straight step portion 61U, the straight step portion 61U is reinforced. You may In such a configuration, by supporting the footboard 73 and the like positioned at the uppermost step of the circular staircase portion 71U with this connecting plate, the straight staircase portion 61U and the straight staircase portion 61U are supported. The supporting strength of the treads can be preferably increased near the boundary with the circular staircase portion 71U.

- Although a plurality of diagonal force beams 62, 62 are used together in the straight step portion 61 shown in the above embodiment, the number of diagonal force beams is arbitrary. For example, when the number of diagonal force beams is one, it is preferable to dispose the diagonal force beam in the center of the straight step portion 61 in the width direction.

- In the above embodiment, the end portion 69U of the diagonal force girder 63U of the straight step portion 61U and the end portion 79U of the horizontal force girder 72U of the circular step portion 71U are directly connected. It is also possible to adopt a configuration in which the end portion 79U of the horizontal force girder 72U is directly connected.

・In the above embodiment, the diagonal force girder 63U is inserted into the notch formed in the upper surface of the horizontal force girder 72U, and both the force girder 63U and 72U are connected. not to be For example, the end portion 69U of the diagonal force girder 63U and the end portion 79U of the horizontal force girder 72U are arranged in the width direction of the upper floor staircase 52, and one side portion of the diagonal force girder 63U and one side portion of the horizontal force girder 72U are arranged. A configuration may be adopted in which both force beams 63U and 72U are connected in a state in which the side portions are in contact (surface contact). In this case, the other side surface of the horizontal force girder 72U is used as the mounting surface of the support frame 74U, and the end 69U of the diagonal force girder 63U and the support frame 74U face each other across the end 79U of the horizontal force girder 72U. , a configuration that is practically preferable can be realized. In particular, by arranging the support frame 74U on the center side in the width direction of the upper floor staircase 52 and arranging the end portions 69U of the diagonal force girder 63U on the outer side, the treads 73 are supported in the circular staircase portion 71U. The strength can be favorably improved.

- In the above embodiment, the case where the diagonal force girder 62 is arranged outside the wall portion 17 is illustrated, but the configuration in which the diagonal force beam 62 is arranged inside the wall portion 17 is denied. is not. In such a configuration, by adding a horizontal force girder extending along the opening 19 and connecting the horizontal force girder and the diagonal force girder 62, the strength of the stairs can be further increased.

- The staircase structure shown in the above embodiment is not limited to a three-story building, and can be applied to a four-story building or more. For example, in a four-story building, for the stairs that connect the second and third floors of the building, the diagonal force girder and the horizontal force girder are directly connected, and for the stairs that connect the third and fourth floors, the diagonal force girder is connected directly. The force girder and the horizontal force girder may be directly connected.

- In the above-described embodiment, the diagonal force girder 63U and the horizontal force girder 72U are connected below the footboard 73U positioned at the top of the round staircase portion 71U, but this is not necessarily the case. . It is sufficient if at least the connecting portion is located on the lower side with respect to the boundary BL1 between the straight staircase portion 61 and the circular staircase portion 71U.

- The connection structure between the straight staircase portion 61U and the circular staircase portion 71U in the upper staircase 52 can be applied to the connection structure between the straight staircase portion 61L and the circular staircase portion 71L in the lower staircase 51.

10... building, 15... staircase space, 50... multi-level stairs, 51... lower stairs, 52... upper stairs, 61... straight stair section, 62... diagonal force girder as "second force girder", 63... " Diagonal force girder as "first force girder" or "force girder for straight staircase", 64 ... tread plate as "tread plate for straight stair section", 65, 66 ... support frame as "tread plate support plate for straight stair section", 71 --- Circular stair section, 72 --- Horizontal force girder as "strength girder for circular stair section", 73 --- Tread plate as "tread board for circular stair section", 74 --- Support frame as "tread plate support plate for circular stair section".

Claims (8)

A multi-story building has an upper staircase on the upper floor side and a lower staircase on the lower floor side provided on the upper and lower floor sides that are vertically adjacent to each other, and the upper staircase and the lower staircase are provided A staircase structure applied to a multistory staircase arranged in a position that overlaps vertically,
The upper staircase comprises a straight staircase portion extending linearly and a circular staircase portion continuing to the lower side of the straight staircase portion,
The round stair portion has a round stair portion strut girder that extends in the horizontal direction and supports at least one round stair portion tread plate of a plurality of round stair portion tread plates,
The straight staircase is
A force girder for straight stairs extending in an oblique direction,
a tread plate support plate fixed to the straight staircase force girder and supporting the straight stair tread plate;
The force girder for the straight stair portion extends below the tread plate for the straight stair portion positioned at the lowest step in the straight stair portion,
the force girder for the straight stair portion and the force girder for the circular stair portion are connected ,
The straight staircase force girder has a lower end portion that extends below the first step circular staircase tread plate, and the straight staircase force girder and the circular staircase force are provided. A staircase structure characterized in that a connecting portion with a girder is positioned below the tread plate for the first step of the first step . The tread support plate is a tread support plate for straight stairs,
The round stair portion is fixed to the round stair portion force girder, and supports a round stair portion tread plate other than the first round stair portion tread plate among the plurality of round stair portion tread plates. having a plate
A connection portion between the straight staircase force girder and the spiral staircase force girder is located below the spiral staircase tread plate positioned at the highest step among the plurality of spiral staircase tread plates. 2. The staircase structure according to claim 1 , wherein the staircase structure is arranged at a position closer to the tread plate for the round stair portion, which is one lower than the staircase structure. 3. The staircase structure according to claim 1 , wherein the lower end of the force girder for the straight stair portion and the end portion of the force girder for the circular stair portion on the side of the straight stair portion are connected. 4. The staircase structure according to claim 3 , wherein the power girder for the round stair portion does not extend toward the straight stair portion from a connecting portion between the power girder for the straight stair portion and the power girder for the round stair portion. . The tread support plate is a tread support plate for straight stairs,
The round stair portion is fixed to the round stair portion force girder, and supports a round stair portion tread plate other than the first round stair portion tread plate among the plurality of round stair portion tread plates. having a plate
The staircase according to any one of claims 1 to 4 , wherein the tread plate support plate for the circular staircase overlaps the force girder for the straight staircase in the width direction of the upper staircase. structure. The mounting location of the tread plate support plate for the circular stair section on the force girder for the circular stair section is the central side in the width direction of the upper stair with respect to the connecting portion between the force girder for the circular stair section and the force girder for the straight stair section. 6. The staircase structure according to claim 5 , wherein the staircase structure is arranged at a position where The power girder for the circular staircase is arranged along the outer portion of the circular staircase in the circular direction of the circular staircase,
The straight stair portion has a first force girder on one end side in the width direction of the straight stair portion as a force girder for the straight step portion, and has a second force girder on the other end side, of which the first force girder is provided. is provided on the same side as the power girder for the surrounding staircase,
7. The first force girder according to any one of claims 1 to 6 , wherein the first force girder extends downward in the vertical direction of the straight staircase portion from the second force girder. staircase structure. The tread plate support plate is a tread plate support plate for a straight staircase,
The round stair portion is fixed to the round stair portion force girder, and supports a round stair portion tread plate other than the first round stair portion tread plate among the plurality of round stair portion tread plates. having a plate
a connecting member that connects the lower end of the second force girder and the intermediate portion of the first force girder,
8. The staircase according to claim 7 , wherein the uppermost one of the plurality of tread plates for the staircase portion is supported by the treadplate support plate for the staircase portion and the connecting member. structure.

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