Support structure for handrail and construction method for handrail

Abstract

To maintain a stabler support state in which a handrail is supported.SOLUTION: The present invention relates to a support structure for a handrail 20 that comprises a plate material (glass plate part 201) stood between a first space and a second space, and that supports lower end parts of the plate materials from both a first space side and a second space side by a first support member 102 arranged on the first space side and a second support member 103 arranged on the second space side. A handrail 20 further comprises a plurality of plate materials (glass plate parts 201) arranged side by side in the extension direction of the handrail 20. The second support member 103 consists of a plurality of division materials arranged side by side in the extension direction, the plurality division materials includes a first division material and a second division material which adjoin each other, and the plurality of division materials include a first plate material and a second plate material which adjoin each other, wherein the first division material supports the first plate material by holding it with the first support member 102, and the second division material supports the first plate material and second plate material by holding them with the first support member 102.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a handrail support structure and a handrail installation method. [Background technology]

[0002] In recent years, there has been an increasing demand for energy-efficient housing, such as net-zero energy houses (ZEH). For example, reducing the size of each room improves heating and cooling efficiency, but in such cases, a design that creates a sense of spaciousness is required. For example, if the handrail between a stairwell and an adjacent room (such as a living room) is made of glass, the interior of the stairwell can be seen from inside the adjacent room through the glass, making it less likely that the adjacent room will feel cramped.

[0003] One possible configuration for a glass handrail is to fit a glass plate between multiple support brackets extending in the height direction of the handrail. However, in this case, the support brackets block the view, which can cause problems such as a loss of the sense of openness. For example, a handrail such as that described in Patent Document 1 can solve the above problem. Patent Document 1 discloses a handrail that includes a glass plate and a plurality of U-shaped support metal fittings that have a generally U-shaped recess that is open at the top and is fixed to a surface to be fixed, and in which the lower end of the glass plate is inserted into the recess of the U-shaped support metal fitting and an expansive fixing member is filled in so as to sandwich the glass plate, thereby making the glass plate stand upright. That is, in Patent Document 1, the handrail is supported by the support metal fittings attached to the lower end of the handrail (glass plate). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6347961 Summary of the Invention [Problem to be solved by the invention]

[0005] Handrails used on stairs and atriums require high strength (horizontal and vertical strength of 1200N). Therefore, it is desirable to maintain a more stable support state for the handrail. The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to maintain a more stable supporting state as a supporting state for supporting a handrail. [Means for solving the problem]

[0006] The invention described in claim 1 is, for example, as shown in Figures 1 to 32, a support structure for a handrail 20 having a plate material (glass plate portion 201, 21) erected between a first space (staircase SR) and a second space (adjacent room NR), a first support member (first support member 102, first cover member 12) disposed on the first space side; a second support member (second support member 103, second cover member 13) disposed on the second space side, The first support member and the second support member sandwich and support the lower end of the plate material from both the first space side and the second space side.

[0007] According to the invention described in claim 1, the pair of support members (the pair of support members 102, 103, the pair of cover members 12, 13) can sandwich and support the lower end of the plate (glass plate portion 201, 21) from both the first space (staircase chamber SR) side and the second space (adjacent room NR) side. This prevents the plate from swaying sideways, making it possible to maintain a more stable support state for supporting the handrail 20.

[0008] The invention described in claim 2 is, for example, as shown in Figs. 1 to 18, in the support structure described in claim 1, The handrail 20 includes a plurality of plate members (glass plate portions 201) arranged along the extending direction of the handrail 20, The second support member 103 is composed of a plurality of divided members 1031, 1032, and 1033 arranged along the extension direction, The plurality of dividers include a first divider (lower divider 1031 or central divider 1032) and a second divider (central divider 1032 or upper divider 1033) adjacent to the first divider, The plurality of plate members include a first plate member (a lower glass plate member 201 or a middle glass plate member 201) and a second plate member (a middle glass plate member 201 or an upper glass plate member 201) adjacent to the first plate member, The first divided member sandwiches and supports the first plate member between the first divided member and the first support member 102, The second divided member is characterized in that it sandwiches and supports the first plate member and the second plate member between itself and the first support member 102.

[0009] According to the invention described in claim 2, two adjacent plate materials (first plate material and second plate material) can be held down by one divided member (second divided member). Therefore, the two adjacent plate materials can be supported with their surfaces flush with each other, and even if a horizontal load acts on only one of the two adjacent plate materials, the flush state can be maintained. Furthermore, one plate (first plate) can be held down by two divided members (first divided member and second divided member), which improves horizontal strength compared to when one plate is held down by two divided members.

[0010] The invention described in claim 3 is, for example, as shown in Figs. 1 to 18, in the support structure described in claim 2, The widths W24 and W25 of the overlapping portions of the second divided member and the first plate member are set to be at least twice the thickness of the plate member (glass plate portion 201).

[0011] According to the invention described in claim 3, it is possible to reliably obtain the effect of holding two adjacent plate materials with one dividing member and the effect of holding one plate material with two dividing members, compared to when the width dimensions W24, W25 of the overlapping portion of the second dividing member (central dividing member 1032 or upper dividing member 1033) and the first plate material (lower glass plate portion 201 or middle glass plate portion 201) are less than twice the thickness dimension of the plate material (glass plate portion 201).

[0012] The invention described in claim 4 is a construction method for a handrail 20 having a plate material (glass plate portion 201, 21) erected between a first space (staircase SR) and a second space (adjacent room NR), as shown in, for example, Figures 9 to 18 and Figures 26 to 30, an attachment step of attaching base members 104 and 14 to first support members (first support member 102, first cover member 12); a first fixing step of fixing the first support member to a structure (first straight staircase unit 6) installed in the first space; a placing step (placing steps A, B, C) of placing the plate material on the base members 104, 14; The method is characterized by having a second fixing step (second fixing steps A, B, C) in which a second support member (second support member 103, second cover member 13) is fixed to the structure via the first support member while being positioned on the second space side of the plate material on the base members 104, 14.

[0013] According to the invention described in claim 4, the pair of support members (the pair of support members 102, 103, the pair of cover members 12, 13) can sandwich and support the lower end of the plate (glass plate portions 201, 21) from both the first space (staircase chamber SR) side and the second space (adjacent room NR) side. This prevents the plate from swaying sideways, making it possible to maintain a more stable support state for supporting the handrail 20.

[0014] The invention described in claim 5 is, for example, as shown in Figs. 9 to 18, in the construction method described in claim 4, In the first fixing step, the first support member 102 is fixed to the structure (first straight staircase unit 6) by screwing, In the second fixing step, the second support member 103 and the plate material (glass plate portion 201) are fixed to the structure via the first support member 102 by screws.

[0015] According to the invention described in claim 5, the first support member 102 and the second support member 103 are fixed with screws to the structure (first straight staircase unit 6) installed in the first space (staircase chamber SR), so wooden members can be used for the first support member 102 and the second support member 103. This makes it possible to contribute to the realization of a decarbonized society by promoting carbon neutrality and the achievement of the SDGs. In addition, the plate material (glass plate portion 201) is also fixed with screws to the structure (first straight staircase unit 6) installed in the first space (staircase room SR), so even if the plate material is made of glass, it can be installed by carpentry work.

[0016] The invention described in claim 6 is, for example, as shown in Figs. 9 to 18, in the construction method described in claim 4, The handrail 20 includes a plurality of plate members (glass plate portions 201) arranged along the extending direction of the handrail 20, The second support member 103 is composed of a plurality of divided members 1031, 1032, and 1033 arranged along the extension direction, After the first fixation step, The placing step (placing step A or placing step B) is performed to place a first plate (the lower glass plate portion 201 or the middle glass plate portion 201) of the plurality of plate materials on the base member 104; Next, the second fixing step (second fixing step A or second fixing step B) is performed to fix a first dividing member (lower dividing member 1031 or central dividing member 1032) of the plurality of dividing members together with the first plate member to the structure via the first support member 102, Next, the placing step (placing step B or placing step C) is performed to place a second plate member (the middle glass plate member 201 or the upper glass plate member 201) adjacent to the first plate member among the plurality of plate members on the base member 104, Next, the second fixing step (second fixing step B or second fixing step C) is performed to fix a second dividing member (central dividing member 1032 or upper dividing member 1033) adjacent to the first dividing member among the plurality of dividing members, together with the second plate member, to the structure via the first support member 102.

[0017] According to the invention described in claim 6, when the handrail 20 comprises a plurality of plate materials (a plurality of glass plate portions 201), the plurality of plate materials can be lined up one by one and installed in order while being held down with dividing materials, thereby improving workability.

[0018] The invention described in claim 7 is, for example, as shown in Figs. 9 to 18, in the construction method described in claim 6, The first divided member (the lower divided member 1031 or the central divided member 1032) sandwiches and supports the first plate member (the lower glass plate portion 201 or the middle glass plate portion 201) between the first support member 102, The second dividing member (central dividing member 1032 or upper dividing member 1033) is characterized in that it supports the first plate member and the second plate member (middle glass plate portion 201 or upper glass plate portion 201) by sandwiching them between the first support member 102.

[0019] According to the invention described in claim 7, the first plate material and the second plate material can be held down by the second dividing member, which is fixed after the first plate material and fixed together with the second plate material, thereby improving workability.

[0020] The invention described in claim 8 is, for example, as shown in Figs. 9 to 18, the construction method described in claim 6, a spacer material 200 is attached to an end surface of the first plate material (the lower glass plate portion 201 or the middle glass plate portion 201) that faces the second plate material (the middle glass plate portion 201 or the upper glass plate portion 201); After the second fixing step, the spacer material 200 is removed.

[0021] According to the invention described in claim 8, it is possible to form a gap of a predetermined dimension between the first plate material and the second plate material simply by abutting the end face of the second plate material against the spacer material 200 attached to the end face of the first plate material, thereby improving workability. [Effects of the Invention]

[0022] According to the present invention, a more stable supporting state can be maintained as a supporting state for supporting the handrail. [Brief explanation of the drawings]

[0023] [Figure 1] First embodiment: a perspective view showing an example of a first space (stairwell). [Figure 2] First embodiment: a plan view showing an example of a first space (staircase). [Figure 3] First embodiment: a front view showing an example of a first space (staircase). [Figure 4] First embodiment: A side view illustrating the relationship between a structure (first straight staircase unit) installed in the first space and a plate (glass plate portion). [Figure 5] First embodiment: A vertical cross-sectional view for explaining a handrail support structure. [Figure 6] FIG. 1 is a diagram showing an example of a plurality of glass plate portions provided in a handrail according to a first embodiment. [Figure 7] First embodiment: (a) is a diagram showing an example of a first support member, (b) is a diagram showing an example of a base member, and (c) is a diagram showing an example of a second support member. [Figure 8]FIG. 10 is a diagram illustrating an example of the relationship between a second support member and a glass plate portion according to the first embodiment. [Figure 9] First embodiment: A diagram for explaining an example of a handrail construction method. [Figure 10] First embodiment: A diagram for explaining an example of a handrail construction method. [Figure 11] First embodiment: A diagram for explaining an example of a handrail construction method. [Figure 12] First embodiment: A diagram for explaining an example of a handrail construction method. [Figure 13] First embodiment: A diagram for explaining an example of a handrail construction method. [Figure 14] First embodiment: A diagram for explaining an example of a handrail construction method. [Figure 15] First embodiment: A diagram for explaining an example of a handrail construction method. [Figure 16] First embodiment: A diagram for explaining an example of a handrail construction method. [Figure 17] First embodiment: A diagram for explaining an example of a handrail construction method. [Figure 18] First embodiment: A diagram for explaining an example of a handrail construction method. [Figure 19] Second embodiment: a perspective view showing an example of a first space (staircase). [Figure 20] Second embodiment: A plan view showing an example of a first space (staircase) (copboard is not shown). [Figure 21] Second embodiment: a front view showing an example of a first space (staircase) (handrails, supporting metal fittings, and decorative materials provided on the first side wall are not shown). [Figure 22] Second embodiment: A side view illustrating the relationship between a structure (first straight staircase unit) installed in the first space and a plate (glass plate portion). [Figure 23] Second embodiment: A side view for explaining the support structure of the handrail. [Figure 24]Second embodiment: A vertical cross-sectional view for explaining the support structure of a handrail (the coping is not shown). [Figure 25] Second embodiment: A perspective view showing an example of a support metal fitting. [Figure 26] Second embodiment: A diagram for explaining an example of a handrail construction method. [Figure 27] Second embodiment: A diagram for explaining an example of a handrail construction method. [Figure 28] Second embodiment: A diagram for explaining an example of a handrail construction method. [Figure 29] Second embodiment: A diagram for explaining an example of a method for constructing a handrail (plate material (glass plate portion) is indicated by a two-dot chain line). [Figure 30] Second embodiment: A diagram for explaining an example of a method for constructing a handrail (plate material (glass plate portion) is shown by a two-dot chain line. The coping is not shown). [Figure 31] Second embodiment: A diagram showing a modified example of a support metal fitting. [Figure 32] Second embodiment: A diagram showing a modified example of a support metal fitting. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are subject to various limitations that are technically preferable for carrying out the present invention, but the technical scope of the present invention is not limited to the following embodiments and illustrated examples. Note that directions (front-back, left-right, up-down) in the following embodiments and illustrated examples are set solely for the convenience of explanation.

[0025] [First embodiment] <<Configuration of stairs and handrails>> 1 to 5, reference numeral 1 denotes a staircase connecting upper and lower floors. The staircase 1 is arranged in a space partitioned as a staircase SR in a building such as a house, and is fixed to the framework of the building. The building is constructed using a panel construction method in which building components such as walls, floors, and roofs are made into panels in advance at a factory and then these panels are assembled at the construction site, but this is not limited to this and the building may also be constructed using traditional frame construction, wall construction, two-by-four construction, etc. The term "panel" refers to a building panel, which is made up of a rectangular frame made up of vertical and horizontal frame members assembled into a rectangular shape, a frame body made up of auxiliary beam members assembled vertically and horizontally inside this rectangular frame, and a face material attached to one or both sides of this frame body, resulting in a hollow structure. The hollow space inside (the back side of the face material) is usually filled with insulating material such as glass wool or rock wool.

[0026] That is, in this embodiment, the building skeleton is made up of architectural panels such as wall panels 2, floor panels 3, and roof panels, as well as pillars, beams, etc. The structural materials (architectural panels, pillars (pillar materials), beams (beam materials), etc.) that make up the skeleton are covered with fire-resistant covering material 5 and form the walls, floors, and ceilings of each room (such as the stairwell SR). In this embodiment, a reinforced gypsum board is used as the fire-resistant covering material 5, but the fire-resistant covering material is not limited to this and may be other types of fire-resistant covering material.

[0027] The staircase 1 is a unit staircase comprising a plurality of staircase units. As shown in Figure 2, the staircase 1 in this embodiment comprises a first straight staircase unit 6, a second straight staircase unit 7, a first landing unit 8, and a second landing unit 9, and is constructed by assembling the units 6 to 9 in the following order from the bottom up: first straight staircase unit 6, first landing unit 8, second landing unit 9, second straight staircase unit 7. Each of the units 6 to 9 that make up the staircase 1 is manufactured in advance in a factory, either entirely or partially (almost entirely except for some parts).

[0028] Although the staircase 1 of this embodiment is a return staircase composed of straight staircase units 6, 7 and landing units 8, 9 provided between the straight staircase units 6, 7, the present invention is not limited to this. Specifically, for example, the staircase may be a straight staircase equipped with only straight staircase units, or may be a return staircase, a spring staircase, a straight staircase with a landing, a return staircase with a landing, a return staircase with upper and lower landings, or the like equipped with landing units. Furthermore, return staircases and spring staircases may be constructed with spiral staircase units (not shown) instead of landing units. Furthermore, the staircase 1 may be constructed with spiral staircase units as an upper spiral staircase, a lower spiral staircase, or an upper and lower spiral staircase (a three-stage spiral staircase). In other words, the type of staircase 1 is not particularly limited. Furthermore, the staircase 1 can be formed by freely combining the above standardized units, and the units required to form the staircase 1 may be bundled together as a staircase set. In addition, the arrangement and quantity of the structural materials (construction panels, columns, beams, etc.) that make up the staircase SR may be changed as appropriate depending on the type of staircase 1.

[0029] As shown in Figure 2, in a plan view, the first landing unit 8 is located on the front right side of the staircase SR, and the second landing unit 9 is located on the front left side of the staircase SR. Furthermore, the lowest first straight staircase unit 6 is located behind the first landing unit 8, and the highest second straight staircase unit 7 is located behind the second landing unit 9. A wall panel 2 is provided between the first straight staircase unit 6 and the second straight staircase unit 7.

[0030] As shown in Figure 1, a side wall 10 is provided between the staircase SR and an adjacent room NR, which is a room provided on the lower floor (the lower floor of the upper and lower floors connected by the staircase 1) and adjacent to the staircase SR. Specifically, the side wall 10 is provided between the first straight staircase unit 6 and the first landing unit 8 and the adjacent room NR. Of the side walls 10, the upper end of the first side wall 10a located between the first straight staircase unit 6 and the adjacent room NR is inclined to match the gradient of the first straight staircase unit 6, and a handrail 20 is erected at the upper end of the first side wall 10a. In addition, the upper end of a second side wall 10b of the side wall 10 provided between the first landing unit 8 and the adjacent room NR is in contact with the ceiling 4.

[0031] The handrail 20 is a glass handrail that includes a plurality of glass plate portions 201 and a cap board 22 that is provided along the upper edge portions of the plurality of glass plate portions 201. Note that the cap board 22 is not shown in FIG. 2. As shown in Figure 4, the portion of the upper end of the handrail 20 that corresponds to a position halfway up and down the first straight staircase unit 6 is inclined to match the gradient of the first straight staircase unit 6, while the remaining portion, i.e., the portion that corresponds to a position above the first straight staircase unit 6 in the up and down direction (in this embodiment, the portion that corresponds to the top step of the first straight staircase unit 6), is horizontal. This horizontal portion is in contact with the ceiling 4 located above the first side wall 10a. This gives the impression that the upper end of the handrail 20 is being pulled into the ceiling 4 when looking towards the staircase SR from the adjacent room NR side. Hereinafter, the ascending / descending direction of the first straight stair unit 6 may be simply referred to as the "ascending / descending direction."

[0032] FIG. 6 is a diagram showing an example of a plurality of glass plate portions 201 provided on the handrail 20. As shown in FIG. The glass plate portion 201 is formed in a substantially parallelogram shape with its upper and lower ends inclined relative to the horizontal direction in accordance with the gradient of the first straight staircase unit 6. The rear portion of the lower end of the glass plate portion 201 located furthest to the rear (lower in the lifting direction) among the plurality of glass plate portions 201 is horizontally chamfered. The front portion of the upper end of the glass plate portion 201 located furthest to the front (uppermost in the lifting direction) among the plurality of glass plate portions 201 is chamfered horizontally, and this chamfered portion is in contact with the ceiling 4 located above the first side wall 10a.

[0033] The handrail 20 of this embodiment includes three glass plate portions 201, as shown in Figures 1, 2, 4, 6, etc. Hereinafter, the glass plate portion 201 located furthest back (lower in the lifting direction) of the three glass plate portions 201 will be referred to as the "lower glass plate portion 201," the glass plate portion 201 located furthest forward (upper in the lifting direction) of the three glass plate portions 201 will be referred to as the "upper glass plate portion 201," and the glass plate portion 201 located in the middle of the three glass plate portions 201, i.e., the glass plate portion 201 located between the lower glass plate portion 201 and the upper glass plate portion 201, will be referred to as the "middle glass plate portion 201." Although the handrail 20 of this embodiment has three glass plate portions 201, the present invention is not limited to this. That is, the handrail 20 may have one glass plate portion 201 or multiple glass plate portions 201.

[0034] As shown in Figure 5, the first side wall 10a of the side wall 10, which is provided between the first straight staircase unit 6 and the adjacent room NR, is configured to include at least a pair of support members 102, 103 that support the glass plate portion 201 of the handrail 20 by sandwiching it from both the left and right sides, and a base member 104 that supports the glass plate portion 201 from below. Furthermore, the first side wall 10a includes a buffer material 105 provided on the base member 104. That is, the buffer material 105 is provided between the base member 104 and the glass plate portion 201. This makes it possible to prevent the glass plate portion 201 from colliding with the base member 104. In this embodiment, the buffer material 105 is a setting block made of a rubber material and having a thickness of 10 mm, but is not limited to this.

[0035] Of the pair of support members 102, 103, the first support member 102 is provided on the left side (the staircase SR side), and the second support member 103 is provided on the right side (the adjacent room NR side). In this embodiment, the first support member 102 is made of MDF (Medium Density Fiberboard) having a thickness of 39 mm, but is not limited to this. Also, in this embodiment, the second support member 103 is made of MDF having a thickness of 39 mm, but is not limited to this. In this embodiment, the thickness of the first support member 102 is 39 mm, the thickness of the second support member 103 is 39 mm, and the thickness of the base member 104 is 12 mm. In other words, the thickness of the first support member 102, the second support member 103, and the base member 104 are set so that the thickness of the combination of the first support member 102, the second support member 103, and the base member 104 is the same as the thickness of the building panel (structural panel) (90 mm).

[0036] FIG. 7(a) is a diagram showing an example of a first support member 102, FIG. 7(b) is a diagram showing an example of a base member 104, and FIG. 7(c) is a diagram showing an example of a second support member 103. As shown in Figures 7(a) and (c), the support members 102, 103 are formed in a generally parallelogram shape with their upper and lower ends inclined relative to the horizontal direction to match the gradient of the first straight stair unit 6. The rear portions of the lower ends of the support members 102, 103 are chamfered horizontally so as to abut against the floor.

[0037] 7(c), the second support member 103 provided on the right side (neighboring room NR side) is divided into three parts in the lifting direction. That is, the second support member 103 is composed of a lower divided member 1031 located on the lower side in the lifting direction, a central divided member 1032 located in the center in the lifting direction, and an upper divided member 1033 located on the upper side in the lifting direction. The boundary between adjacent lower dividing members 1031 and central dividing members 1032, and the boundary between adjacent central dividing members 1032 and upper dividing members 1033, are perpendicular to the horizontal direction, as are the boundary between adjacent lower glass plate portions 201 and middle glass plate portions 201, and the boundary between adjacent middle glass plate portions 201 and upper glass plate portions 201. Although the second support member 103 in this embodiment is divided into three parts, this is not limited to this. That is, the second support member 103 may be divided into any number of parts. Alternatively, the second support member 103 may not be divided.

[0038] The base member 104 is disposed between the support members 102 and 103 . In this embodiment, the base member 104 is delivered to the construction site in a state where it is attached to the lower end of the first support member 102. In other words, the base member 104 and the first support member 102 are integrated in advance at a factory or the like, and are delivered to the construction site in this integrated state. The thickness of the base member 104 is set to be equal to the thickness of the glass plate portion 201. In this embodiment, the thickness of the glass plate portion 201 is set to be 12 mm, and the base member 104 in this embodiment is a plywood having a thickness of 12 mm. The thicknesses of the glass plate portion 201 and the base member 104 are not limited to 12 mm, but it is preferable that the thickness of the glass plate portion 201 and the thickness of the base member 104 are the same.

[0039] 7(a) and 7(b), two base members 104 are attached to the first support member 102. That is, the first side wall 10a of this embodiment includes, as base members 104 that support the glass plate portion 201 from below, a base member 104 to which a horizontally chamfered portion at the lower end of the first support member 102 is attached, and a base member 104 to which a portion at the lower end of the first support member 102 that is inclined with respect to the horizontal direction is attached.

[0040] As shown in FIG. 5, the first side wall 10a (specifically, the support members 102, 103 and the base member 104) is fixed to the first straight staircase unit 6 by fixing members 106, 107. Specifically, the composite body formed by integrating the first support member 102 and the base member 104 is fixed to the first straight staircase unit 6 by a first fixing member 106 driven into the right surface (the surface facing the adjacent room NR) of the base member 104. In this embodiment, the first fixing member 106 is a coarse thread having a length of 90 mm, but is not limited to this.

[0041] In addition, the second support member 103 is fixed to the first straight staircase unit 6 via the glass plate portion 201 and the first support member 102 by a second fixing material 107 driven into the right surface (the surface facing the adjacent room NR) of the second support member 103. As shown in FIG. 7(c), the second support member 103 is provided with a pilot hole 103a for a second fixing member 107. As shown in Figure 6, the glass plate portion 201 has a hole 201a at a position corresponding to the pilot hole 103a. The second fixing member 107 passes through the hole 201a. In other words, the glass plate portion 201 is fixed to the first straight stair unit 6 by the second fixing member 107 via the first support member 102. As shown in Figure 5, the second fixing member 107 penetrates the first support member 102. That is, the first support member 102 (and the base member 104) is fixed to the first straight stair unit 6 by the first fixing member 106 and the second fixing member 107. In this embodiment, the second fixing material 107 is a coarse thread having a length of 125 mm, but is not limited to this.

[0042] FIG. 8 is a diagram illustrating an example of the relationship between the plurality of glass plate portions 201 and the second support member 103. As shown in FIG. The handrail 20 has the same number of glass plate portions 201 as the number of divisions of the second support member 103. That is, the handrail 20 of this embodiment has three glass plate portions 201. These glass plate portions 201 are installed with a gap of a predetermined dimension (for example, 6 mm) formed between the glass plate portions 201.

[0043] On the other hand, the plurality of divided members 1031, 1032, and 1033 that make up the second support member 103 are arranged without any gaps. Of these dividing members, the lower dividing member 1031 is placed so as to overlap the lower glass plate portion 201 (when viewed from the left and right). Further, the center dividing member 1032 is installed in a state of overlapping the lower glass plate portion 201 and the middle glass plate portion 201 (a state of overlapping when viewed from the left - right direction). That is, the center dividing member 1032 is installed in a state of straddling the lower glass plate portion 201 and the middle glass plate portion 201. Also, the upper dividing member 1033 is installed in a state of overlapping the middle glass plate portion 201 and the upper glass plate portion 201 (a state of overlapping when viewed from the left - right direction). That is, the upper dividing member 1033 is installed in a state of straddling the middle glass plate portion 201 and the upper glass plate portion 201.

[0044] Specifically, the width dimension W21 of the lower dividing member 1031 is set shorter than the width dimension W11 of the lower glass plate portion 201 (W21 < W11). And the lower dividing member 1031 is disposed at a position where the rear end face is in a state of being flush with the rear end face of the lower glass plate portion 201 (a state of being flush when viewed from the left - right direction), and the front end face is disposed at a position where it is in contact with the center dividing member 1032. Thereby, the center dividing member 1032 can be installed in a state of straddling the lower glass plate portion 201 and the middle glass plate portion 201.

[0045] Also, the difference obtained by subtracting the width dimension W24 of the overlapping portion between the center dividing member 1032 and the lower glass plate portion 201 and the dimension of the gap (predetermined dimension) provided between the glass plate portions 201 from the width dimension W22 of the center dividing member 1032 is set shorter than the width dimension W12 of the middle glass plate portion 201 ((W22 - W24 - predetermined dimension) < W12). And the center dividing member 1032 is disposed at a position where the rear end face is in a state of being in contact with the lower dividing member 1031, and the front end face is disposed at a position where it is in contact with the upper dividing member 1033. Thereby, the upper dividing member 1033 can be installed in a state of straddling the middle glass plate portion 201 and the upper glass plate portion 201.

[0046] Furthermore, the difference between the width dimension W23 of the upper dividing member 1033 and the width dimension W25 of the overlapping portion between the upper dividing member 1033 and the middle glass plate 201 and the dimension (predetermined dimension) of the gap between the glass plate 201 is set to be longer than the width dimension W13 of the upper glass plate 201 ((W23 - W25 - predetermined dimension) > W13). The upper dividing member 1033 is positioned so that its rear end surface is in contact with the central dividing member 1032, and its front end is in contact with the second side wall 10b. In other words, the upper dividing member 1033 is installed from the central dividing member 1032 to the second side wall 10b.

[0047] In this way, in the support structure of this embodiment, two adjacent glass plate portions 201 are held down by the same plate. Specifically, the lower glass plate portion 201 and the middle glass plate portion 201 (two adjacent glass plate portions 201) are held down by the central dividing member 1032 (the same plate) that constitutes the second support member 103. This allows the lower glass plate portion 201 and the middle glass plate portion 201 to be supported with their surfaces (the surface on the staircase chamber SR side and the surface on the adjacent room NR side) flush with each other, and even if a horizontal load acts on one of the lower glass plate portion 201 and the middle glass plate portion 201, the flush state can be maintained.

[0048] Similarly, the middle glass plate portion 201 and the upper glass plate portion 201 (two adjacent glass plate portions 201) are held down by the upper dividing member 1033 (the same plate) that constitutes the second support member 103. This allows the middle glass plate portion 201 and the upper glass plate portion 201 to be supported with their surfaces (the surface on the staircase chamber SR side and the surface on the adjacent room NR side) flush with each other, and even if a horizontal load acts on one of the middle glass plate portion 201 and the upper glass plate portion 201, the flush state can be maintained.

[0049] Furthermore, in the support structure of this embodiment, one glass plate portion 201 is held down by two plates, which improves horizontal strength. Specifically, the lower dividing member 1031 and the central dividing member 1032 (two plates) that constitute the second support member 103 hold down the lower glass plate portion 201 (one glass plate portion 201). Similarly, the central dividing member 1032 and the upper dividing member 1033 (two plates) that constitute the second support member 103 hold down the middle glass plate portion 201 (one glass plate portion 201).

[0050] As described above, in the support structure of this embodiment, the lower glass plate portion 201 and the middle glass plate portion 201 are held down by two plates. On the other hand, the upper glass plate portion 201 is held down by a single plate (upper dividing member 1033) instead of two plates. The upper glass plate portion 201 is in contact with the ceiling 4 and the second side wall 10b, and therefore is supported not only by the first side wall 10a but also by the ceiling 4 and the second side wall 10b. On the other hand, the lower glass plate portion 201 and the middle glass plate portion 201 are not in contact with the ceiling 4 or the second side wall 10b, and therefore the only structure that can support the lower glass plate portion 201 and the middle glass plate portion 201 is the first side wall 10a. Therefore, in this embodiment, such a glass plate portion 201 (i.e., a glass plate portion 201 whose only supportable structure is the first side wall 10a) is held down by multiple plates, thereby improving horizontal strength.

[0051] In this embodiment, the width dimension W11 of the upper glass plate portion 201, the width dimension W12 of the middle glass plate portion 201, and the width dimension W13 of the lower glass plate portion 201 are set to be equal, but this is not limited to this. In addition, in this embodiment, of the width dimension W21 of the lower dividing member 1031, the width dimension W22 of the central dividing member 1032, and the width dimension W23 of the upper dividing member 1033, the width dimension W21 of the lower dividing member 1031 is set to the smallest, and the width dimension W23 of the upper dividing member 1033 is set to the largest, but this is not limited to this.

[0052] In addition, in this embodiment, the width dimension W24 of the overlapping portion between the central dividing material 1032 and the lower glass plate portion 201 is set to 2.5 times (approximately 30 mm) the thickness dimension of the glass plate portion 201, but this is not limited to this. The width dimension W24 of the overlapping portion between the central dividing member 1032 and the lower glass plate portion 201 may preferably be at least twice the thickness dimension of the glass plate portion 201, and more preferably be at least two times but not more than three times the thickness dimension of the glass plate portion 201.

[0053] In addition, in this embodiment, the width dimension W25 of the overlapping portion between the upper dividing member 1033 and the middle glass plate portion 201 is set to 2.5 times (approximately 30 mm) the thickness dimension of the glass plate portion 201, but this is not limited to this. The width dimension W25 of the overlapping portion between the upper dividing member 1033 and the middle glass plate portion 201 may preferably be at least twice the thickness dimension of the glass plate portion 201, and more preferably be at least two times but not more than three times the thickness dimension of the glass plate portion 201.

[0054] If the width dimension W24 of the overlapping portion between the central dividing member 1032 and the lower glass plate 201 is less than twice the thickness dimension of the glass plate 201, the central dividing member 1032 will be unable to adequately support the lower glass plate 201. This makes it difficult to achieve the above-mentioned effects of being able to support the lower glass plate 201 and the middle glass plate 201 with their surfaces flush with each other, of being able to maintain that flush state even when a horizontal load acts on one of the lower glass plate 201 and the middle glass plate 201, and of improving horizontal strength because the lower dividing member 1031 and the central dividing member 1032 (two plates) hold down the lower glass plate 201 (one glass plate 201). The same applies to the width W25 of the overlapping portion between the upper divided member 1033 and the middle glass plate portion 201.

[0055] Furthermore, if the width dimension W24 of the overlapping portion between the central dividing member 1032 and the lower glass plate portion 201 is long (for example, greater than three times the thickness dimension of the glass plate portion 201), it becomes difficult to provide space at the front end portion (the end portion on the central dividing member 1032 side) of the lower dividing member 1031 for driving screws to fix the lower dividing member 1031 to the first straight stair unit 6. Furthermore, in this case, the difference between the width dimension W21 of the lower dividing member 1031, the width dimension W22 of the central dividing member 1032, and the width dimension W23 of the upper dividing member 1033 becomes large, making it difficult to transport the dividing members 1031, 1032, 1033, etc. The same applies to the width W25 of the overlapping portion between the upper divided member 1033 and the middle glass plate portion 201.

[0056] <Handrail installation method> Next, a method for installing the handrail 20 will be described with reference to Figures 9 to 18. For the sake of convenience, the fire-resistant covering material 5 is not shown in Figures 9 to 18.

[0057] 9(b), the base member 104 is attached to a specified position on the lower end of the first support member 102 at a factory or the like (attachment step). The fixing means for fixing the base member 104 to the first support member 102 may be a fixing material (such as a screw), an adhesive, or a combination of these. As shown in FIG. 9(b), buffer materials 105 are attached to the upper surface of the base member 104 at designated positions in a factory or the like. 11(b) and 13(b), spacer materials 200 are attached at a factory or the like to designated positions on the end faces of the glass plate portions 201. The spacer materials 200 are intended to protect the glass plate portions 201 and to form gaps of a predetermined dimension (for example, 6 mm) between the glass plate portions 201.

[0058] Next, the decorative material 16, the glass plate portion 201, the coping board 22, the first support member 102 with the base member 104 attached, and the dividing members 1031, 1032, and 1033 are transported from a factory or the like to a construction site (transportation step). Similarly, the straight staircase units 6, 7 and landing units 8, 9 that make up the staircase 1 are also pre-assembled in a factory or the like and then transported to the construction site.

[0059] At the construction site, after the foundation work is completed, the framework assembly work begins. During the assembly work, the architectural panels, columns, beams, etc. that make up the stairwell SR and adjacent room NR are assembled. After the skeleton assembly work is completed, the fire-resistant covering material 5 is attached to the surface of the skeleton. The fixing means for fixing the fire-resistant covering material 5 to the skeleton may be a fixing material (such as a screw), an adhesive, or a combination of these. Next, install units 6 to 9 in the stairwell SR.

[0060] FIG. 9(a) is a diagram showing an example of a state in which the first straight staircase unit 6 is installed in the staircase SR. As shown in Figure 10, the first straight staircase unit 6 comprises left and right stringers 61 that serve as the side panels of the first straight staircase unit 6, a plurality of step plates 62 that are arranged in stages between the stringers 61 to form the treads, and a plurality of risers 63 that are arranged between the plurality of step plates 62 and below the lowest step plate 62. Furthermore, a support plate 64 is attached to the stringer 61 on the right side (neighboring room NR side) of the first straight staircase unit 6, which supports from below the fire-resistant covering material 5 (see Figure 5) that is arranged between the first straight staircase unit 6 and the first support member 102. For convenience, Figures 9 and 11 to 18 illustrate the stringer 61 and the support plate 64 attached to the right stringer 61 of the first straight staircase unit 6, and omit the illustration of the step plate 62 and riser 63. The first straight staircase unit 6 may be a staircase unit having stair side beams instead of a staircase unit having stringers 61. Furthermore, the first staircase unit 6 does not have to be pre-assembled in a factory or the like and then transported to the construction site, but may be assembled at the construction site.

[0061] Next, handrail installation work is carried out between the staircase SR and the adjacent room NR, in which the handrail 20 and the support structure (first side wall 10a) that supports it are installed. Specifically, in the handrail installation work, first, as shown in Figure 11(a), the first support member 102 (see Figure 9(b)) is fixed to the right side (the surface of the right-hand stringer 61 facing the adjacent room NR) of the first straight staircase unit 6 installed in the staircase SR (first fixing step). That is, while the left surface of the first support member 102 (the surface opposite to the surface on which the base member 104 is attached) is pressed against the support plate 64 attached to the right-side stringer 61 and the fire-resistant coating material 5 placed on the support plate 64, the first fixing member 106 is driven from the right surface of the base member 104 toward the right-side stringer 61.

[0062] Next, as shown in FIG. 12(a), the lower glass plate portion 201 (see FIG. 11(b)) is placed on the base member 104 attached to the first support member 102 (placement step A). Specifically, the lower glass plate portion 201 is placed on the buffer material 105 attached to the base member 104 .

[0063] Next, as shown in Figure 13(a), the lower dividing member 1031 (see Figure 12(b)) of the second support member 103 is fixed to the right side (the surface of the right-hand stringer 61 facing the adjacent room NR) of the first straight staircase unit 6 installed in the staircase SR, via the lower glass plate portion 201 and the first support member 102 (second fixing step A). Specifically, with the left surface of the lower divided member 1031 pressed against the base member 104 attached to the first support member 102 and the lower glass plate portion 201 resting on the base member 104, the second fixing member 107 is driven from the right surface of the lower divided member 1031 toward the right stringer 61. This causes the lower glass plate portion 201 to stand vertically, and at the same time, the strength required for the handrail 20 is obtained. In addition, in order to prevent the lower glass plate portion 201 from slipping down between the placement step A in which the lower glass plate portion 201 is placed and the second fixing step A in which the lower dividing member 1031 is fixed, a step of attaching a temporary fixing material to a predetermined portion of the lower glass plate portion 201 (for example, the rear end surface) to temporarily support the lower glass plate portion 201 may be performed between the placement step A and the second fixing step A.

[0064] Next, as shown in FIG. 14(a), the middle glass plate portion 201 (see FIG. 13(b)) is placed on the base member 104 attached to the first support member 102 (placement step B). Specifically, the middle glass plate portion 201 is placed on the buffer material 105 attached to the base member 104 .

[0065] Next, as shown in Figure 15(a), the central dividing member 1032 (see Figure 14(b)) in the second support member 103 is fixed to the right side (the surface of the right-hand stringer 61 facing the adjacent room NR) of the first straight staircase unit 6 installed in the staircase SR, via the middle glass plate portion 201 and the first support member 102 (second fixing step B). Specifically, with the left surface of the central dividing member 1032 pressed against the base member 104 attached to the first support member 102 and the lower and middle glass plate portions 201 resting on the base member 104, the second fixing member 107 is driven from the right surface of the central dividing member 1032 toward the right stringer 61. This causes the middle glass plate portion 201 to stand vertically, and at the same time, the strength required for the handrail 20 is obtained.

[0066] Next, as shown in FIG. 16(a), the upper glass plate portion 201 (see FIG. 15(b)) is placed on the base member 104 attached to the first support member 102 (placement step C). Specifically, the upper glass plate portion 201 is placed on the buffer material 105 attached to the base member 104 .

[0067] Next, as shown in Figure 17(a), the upper dividing member 1033 (see Figure 16(b)) of the second support member 103 is fixed to the right side (the surface of the right-hand stringer 61 facing the adjacent room NR) of the first straight staircase unit 6 installed in the staircase SR, via the upper glass plate portion 201 and the first support member 102 (second fixing step C). Specifically, with the left surface of the upper divider 1033 pressed against the base member 104 attached to the first support member 102 and the middle and upper glass plate portions 201 resting on the base member 104, the second fixing member 107 is driven from the right surface of the upper divider 1033 toward the right stringer 61. This causes the upper glass plate portion 201 to stand vertically, while at the same time providing the strength required for the handrail 20. This also forms the second support member 103 by the lower divider 1031, central divider 1032, and upper divider 1033.

[0068] Next, the right surface (the surface facing the adjacent room NR) of the second support member 103 is covered with the fire-resistant covering material 5. The fixing means for fixing the fire-resistant covering material 5 to the second support member 103 may be a fixing material (such as a screw), an adhesive, or a combination of these. 18, the decorative material 16 is attached to the upper and front end surfaces of the first support member 102 and the second support member 103. That is, the decorative material 16 is attached to the upper and front end surfaces of the first side wall 10a. The fixing means for fixing the decorative material 16 to the side wall 10 may be a fixing tool (such as a screw), an adhesive, or a combination of these.

[0069] 18, a capping board 22 is attached to the upper edge of the glass plate portion 201. In this embodiment, the horizontal portion of the upper edge of the glass plate portion 201 is in contact with the ceiling 4 located above the first side wall 10a, and so the capping board 22 is attached to a portion other than the horizontal portion, i.e., the inclined portion of the upper edge of the glass plate portion 201. A capping board 22 is also attached to the upper part of the rear end portion of the lower glass plate portion 201. Additionally, the spacer material 200 disposed between the adjacent glass plate portions 201 is removed. This allows the handrail 20 and the support structure (first side wall 10a) that supports it to be installed between the staircase SR and the adjacent room NR.

[0070] In addition, decorative members (decorative steps, decorative risers) are attached to the surface of the stairs 1. In Figures 3 and 4, the members with diagonal grid hatching are the decorative members of the stairs 1 (decorative steps, decorative risers). In addition, wall interior materials such as wallpaper are pasted on the surface (the surface facing the staircase SR) of the fire-resistant covering material 5 (the fire-resistant covering material 5 provided between the first straight staircase unit 6 and the first support member 102) covering the first support member 102, and on the surface (the surface facing the adjacent room NR) of the fire-resistant covering material 5 covering the second support member 103.

[0071] "effect" According to the first embodiment, the following excellent effects are achieved. Specifically, the support structure of the handrail 20 in this embodiment is a support structure for the handrail 20 that has a plate material (glass plate portion 201) that is erected between the first space (staircase SR) and the second space (adjacent room NR), and is equipped with a first support member 102 that is arranged on the first space side and a second support member 103 that is arranged on the second space side, and is configured so that the first support member 102 and the second support member 103 sandwich and support the lower end of the plate material from both the first space side and the second space side.

[0072] That is, the pair of support members 102, 103 can sandwich and support the lower end of the plate (glass plate portion 201) from both the first space (staircase chamber SR) side and the second space (adjacent room NR) side. This prevents the plate from swaying sideways, making it possible to maintain a more stable support state for supporting the handrail 20.

[0073] The plate material is not limited to a transparent glass plate (glass plate portion 201), but may be a translucent or opaque glass plate, an acrylic plate, a wooden plate, etc. From the viewpoint of making it possible to see (including unclear visibility (dim visibility)) the inside of the first space (staircase SR) from inside the second space (adjacent room NR) through the plate material and making it difficult to feel the narrowness of the second space even if it is narrow, the plate material is preferably a plate-like member having optical transparency. Furthermore, the first space is not limited to the stairwell SR (the inclined portion of the stairwell SR), but may also be a landing (the horizontal portion of the stairwell SR), an upper floor, an intermediate floor between the upper floor and the lower floor, etc. In other words, the handrail 20 is not limited to a handrail with a slanted upper end, but may also be a handrail with a horizontal upper end (the majority of the upper end).

[0074] Furthermore, in the support structure for the handrail 20 in this embodiment, the handrail 20 can be made to include a plurality of plates (a plurality of glass plate portions 201) lined up along the extension direction (lifting direction) of the handrail 20, and the second support member 103 can be made to be composed of a plurality of dividers 1031, 1032, 1033 lined up along the extension direction. When the plurality of dividers includes a first divider and a second divider adjacent to the first divider, and the plurality of plate members includes a first plate and a second plate adjacent to the first plate, it is possible to sandwich and support the first plate between the first divider and the first support member 102, and to sandwich and support the first plate and the second plate between the second divider and the first support member 102.

[0075] When the first and second divided members are the lower divided member 1031 and the central divided member 1032, the first and second plate members are the lower glass plate portion 201 and the middle glass plate portion 201. Furthermore, when the first and second divided members are the central divided member 1032 and the upper divided member 1033, the first and second plate members are the middle glass plate portion 201 and the upper glass plate portion 201.

[0076] This configuration allows two adjacent plate materials (first plate material and second plate material) to be held down by one divided member (second divided member). Therefore, the two adjacent plate materials can be supported with their surfaces flush with each other (effect A), and even if a horizontal load acts on only one of the two adjacent plate materials, the flush state can be maintained (effect B). Furthermore, this configuration allows one plate (first plate) to be held down by two divided members (first divided member and second divided member), which improves horizontal strength compared to when one plate is held down by one divided member (Effect C).

[0077] In the first embodiment, the lower glass plate portion 201 and the middle glass plate portion 201 (two adjacent plate materials) are held down by a central dividing member 1032 (one dividing member), but the lower glass plate portion 201 and the middle glass plate portion 201 (two adjacent plate materials) may also be held down by a lower dividing member 1031 (one dividing member). In addition, in the first embodiment, the middle glass plate portion 201 and the upper glass plate portion 201 (two adjacent plate materials) are held down by the upper dividing member 1033 (one dividing member), but the middle glass plate portion 201 and the upper glass plate portion 201 (two adjacent plate materials) may also be held down by the central dividing member 1032 (one dividing member).

[0078] Furthermore, in the support structure of the handrail 20 in this embodiment, the width dimensions W24, W25 of the overlapping portion between the second dividing member and the first plate member can be set to more than twice the thickness dimension of the plate member (glass plate portion 201).

[0079] By configuring it in this manner, it is possible to reliably obtain the effects (the above-mentioned effects A and B) that arise from holding two adjacent plate materials with one dividing material, and the effect (the above-mentioned effect C) that arises from holding one plate material with two dividing materials, compared to when the width dimensions W24, W25 of the overlapping portion of the second dividing material (the central dividing material 1032 or the upper dividing material 1033) and the first plate material (the lower glass plate portion 201 or the middle glass plate portion 201) are less than twice the thickness dimension of the plate material (the glass plate portion 201).

[0080] In addition, the construction method for the support structure of the handrail 20 in this embodiment is a construction method for a handrail 20 equipped with a plate material (glass plate portion 201) that is erected between a first space (staircase SR) and a second space (adjacent room NR), and is configured to include an attachment step of attaching a base member 104 to the first support member 102, a first fixing step of fixing the first support member 102 to a structure (first straight stair unit 6) to be installed in the first space, a placement step of placing the plate material on the base member 104, and a second fixing step of fixing the second support member 103 to the structure via the first support member 102, with the second support member 103 positioned closer to the second space than the plate material on the base member 104.

[0081] That is, the pair of support members 102, 103 can sandwich and support the lower end of the plate (glass plate portion 201) from both the first space (staircase chamber SR) side and the second space (adjacent room NR) side. This prevents the plate from swaying sideways, making it possible to maintain a more stable support state for supporting the handrail 20.

[0082] As mentioned above, the first space is not limited to the staircase SR (the inclined portion of the staircase SR), but may also be a landing (the horizontal portion of the staircase SR), an upper floor, an intermediate floor between the upper floor and the lower floor, etc. In other words, the structure installed in the first space is not limited to a straight staircase unit. For example, if the first space is a landing, the structure installed in the first space is a landing unit, etc., and if the first space is an upper floor or an intermediate floor between the upper floor and the lower floor, the structure installed in the first space is a structural member that constitutes the ceiling of the lower floor or the floor of the upper floor (intermediate floor), etc.

[0083] Furthermore, in the construction method for the support structure of the handrail 20 in this embodiment, in the first fixing step, the first support member 102 can be fixed to the structure (first straight stair unit 6) by screwing, and in the second fixing step, the second support member 103 and the plate material (glass plate portion 201) can be fixed to the structure via the first support member 102 by screwing.

[0084] With this configuration, the first support member 102 and the second support member 103 (specifically, the dividers 1031, 1032, and 1033 that make up the second support member 103) are fixed with screws to the structure (first straight staircase unit 6) installed in the first space (staircase chamber SR), so wooden members can be used for the first support member 102 and the second support member 103. This makes it possible to contribute to the realization of a decarbonized society by promoting carbon neutrality and the achievement of the SDGs. Furthermore, the plate material (glass plate portion 201) is also fixed with screws to the structure (first straight staircase unit 6) installed in the first space (staircase room SR), so even if the plate material is made of glass, it can be installed by carpentry work. In other words, the plate material can be installed without specialized knowledge or skills in glass work, so the handrail 20 can be easily constructed.

[0085] Furthermore, in the construction method for the support structure of the handrail 20 in this embodiment, the handrail 20 can be made to include a plurality of plates (a plurality of glass plate portions 201) lined up in the extension direction (lifting direction) of the handrail 20, and the second support member 103 can be made to be composed of a plurality of dividers 1031, 1032, 1033 lined up in the extension direction. Then, after the first fixing step, a placing step can be performed in which a first plate member of the plurality of plate members is placed on the base member 104, followed by a second fixing step in which the first divider member of the plurality of dividers is fixed to the structure together with the first plate member via the first support member 102, followed by a placing step in which a second plate member of the plurality of plate members adjacent to the first plate member is placed on the base member 104, followed by a second fixing step in which the second divider member of the plurality of dividers is fixed to the structure together with the second plate member via the first support member 102.

[0086] When the first dividing member and the second dividing member are the lower dividing member 1031 and the central dividing member 1032, the step of placing the first plate member is the step of placing A (Figure 12(a)), the second step of fixing the first dividing member and the first plate member is the step of fixing A (Figure 13(a)), the step of placing the second plate member is the step of placing B (Figure 14(a)), and the second step of fixing the second dividing member and the second plate member is the step of fixing B (Figure 15(a)). Furthermore, when the first dividing member and the second dividing member are the central dividing member 1032 and the upper dividing member 1033, the step of placing the first plate member is the step of placing B (Figure 14(a)), the second fixing step of fixing the first dividing member and the first plate member is the step of second fixing B (Figure 15(a)), the step of placing the second plate member is the step of placing C (Figure 16(a)), and the second fixing step of fixing the second dividing member and the second plate member is the step of second fixing C (Figure 17(a)).

[0087] By configuring it in this way, when the handrail 20 has multiple plate materials (multiple glass plate portions 201), the multiple plate materials can be lined up one by one and installed in order while being held down with dividing materials, thereby improving workability.

[0088] In addition, in the construction method of the support structure of the handrail 20 in this embodiment, the first plate material (the lower glass plate portion 201 or the middle glass plate portion 201) can be sandwiched and supported between the first dividing member (the lower dividing member 1031 or the central dividing member 1032) and the first support member 102, and the first plate material and the second plate material (the middle glass plate portion 201 or the upper glass plate portion 201) can be sandwiched and supported between the second dividing member (the central dividing member 1032 or the upper dividing member 1033) and the first support member 102.

[0089] This configuration allows the first and second plate members to be held down by the second partition member, which is fixed after the first plate member and fixed together with the second plate member. This improves workability compared to a configuration in which the first and second plate members are sandwiched and supported between the first partition member and the first support member 102, i.e., a configuration in which the first and second plate members are held down by the first partition member, which is fixed together with the first plate member and fixed before the second plate member. Specifically, in a configuration in which the first and second plate members are sandwiched and supported between the first divider and the first support member 102, after the first divider and first plate member are fixed, it is necessary to place the second plate member on the base member 104 while inserting it between the first divider and the first support member 102, which is time-consuming. In contrast, in a configuration in which the first and second plate members are sandwiched and supported between the second divider and the first support member 102, as in the first embodiment, it is not necessary to insert the second plate member between the first divider and the first support member 102, which reduces the time-consuming work and improves workability.

[0090] Furthermore, in the construction method of the support structure of the handrail 20 in this embodiment, it is possible to attach a spacer material 200 to the end face of the first plate material (the lower glass plate portion 201 or the middle glass plate portion 201) that faces the second plate material (the middle glass plate portion 201 or the upper glass plate portion 201), and it is possible to remove the spacer material 200 after the second fixing step.

[0091] By configuring it in this manner, it is possible to form a gap of a specified dimension between the first plate material and the second plate material simply by abutting the end face of the second plate material against the spacer material 200 attached to the end face of the first plate material, thereby improving workability.

[0092] Furthermore, in recent years, there has been a demand for the realization of a carbon-neutral society by promoting carbon neutrality, which reduces carbon dioxide emissions to virtually zero, and for the achievement of the SDGs (Sustainable Development Goals), and in the construction industry as well, efforts are being made to build buildings using wood, which has low carbon dioxide emissions. In the support structure of the handrail 20 in the first embodiment, the support members 102, 103 and base member 104 are made of wood, which can contribute to the realization of a carbon-neutral society by promoting carbon neutrality and the achievement of the SDGs. Furthermore, the support structure and construction method of the handrail 20 in the first embodiment are suitable for energy-saving homes, and therefore can contribute to the realization of a decarbonized society through the promotion of carbon neutrality and the achievement of the SDGs from the perspective of energy consumption efficiency in homes.

[0093] [Second embodiment] Next, a second embodiment of the present invention will be described. For the sake of convenience, elements common to the first embodiment will be denoted by the same reference numerals and descriptions thereof will be omitted or simplified. The second embodiment differs from the first embodiment in that a support metal fitting 11 is used.

[0094] <<Configuration of stairs and handrails>> 19 and 20, reference numeral 1 denotes a staircase connecting upper and lower floors. The staircase 1 is arranged in a space partitioned as a staircase SR in a building such as a house, and is fixed to the framework of the building. The building is constructed using a panel construction method in which building components such as walls, floors, and roofs are made into panels in advance at a factory and then these panels are assembled at the construction site, but this is not limited to this and the building may also be constructed using traditional frame construction, wall construction, two-by-four construction, etc. The term "panel" refers to a building panel, which is made up of a rectangular frame made up of vertical and horizontal frame members assembled into a rectangular shape, a frame body made up of auxiliary beam members assembled vertically and horizontally inside this rectangular frame, and a face material attached to one or both sides of this frame body, resulting in a hollow structure. The hollow space inside (the back side of the face material) is usually filled with insulating material such as glass wool or rock wool.

[0095] That is, in this embodiment, the building skeleton is made up of architectural panels such as wall panels 2, floor panels 3, and roof panels, as well as pillars, beams, etc. The structural materials (architectural panels, pillars (pillar materials), beams (beam materials), etc.) that make up the skeleton are covered with fire-resistant covering material 5 and form the walls, floors, and ceilings of each room (such as the stairwell SR). In this embodiment, a reinforced gypsum board is used as the fire-resistant covering material 5, but the fire-resistant covering material is not limited to this and may be other types of fire-resistant covering material.

[0096] The staircase 1 is a unit staircase comprising a plurality of staircase units. As shown in Figure 20, the staircase 1 in this embodiment comprises a first straight staircase unit 6, a second straight staircase unit 7, a first landing unit 8, and a second landing unit 9, and is constructed by assembling the units 6 to 9 in the following order from the bottom up: first straight staircase unit 6, first landing unit 8, second landing unit 9, second straight staircase unit 7. Each of the units 6 to 9 that make up the staircase 1 is manufactured in advance in a factory, either entirely or partially (almost entirely except for some parts).

[0097] Although the staircase 1 of this embodiment is a return staircase composed of straight staircase units 6, 7 and landing units 8, 9 provided between the straight staircase units 6, 7, the present invention is not limited to this. Specifically, for example, the staircase may be a straight staircase equipped with only straight staircase units, or may be a return staircase, a spring staircase, a straight staircase with a landing, a return staircase with a landing, a return staircase with upper and lower landings, or the like equipped with landing units. Furthermore, return staircases and spring staircases may be constructed with spiral staircase units (not shown) instead of landing units. Furthermore, the staircase 1 may be constructed with spiral staircase units as an upper spiral staircase, a lower spiral staircase, or an upper and lower spiral staircase (a three-stage spiral staircase). In other words, the type of staircase 1 is not particularly limited. Furthermore, the staircase 1 can be formed by freely combining the above standardized units, and the units required to form the staircase 1 may be bundled together as a staircase set. In addition, the arrangement and quantity of the structural materials (construction panels, columns, beams, etc.) that make up the staircase SR may be changed as appropriate depending on the type of staircase 1.

[0098] As shown in Figure 20, in a plan view, the first landing unit 8 is located on the front right side of the staircase SR, and the second landing unit 9 is located on the front left side of the staircase SR. Furthermore, the lowest first straight staircase unit 6 is located behind the first landing unit 8, and the highest second straight staircase unit 7 is located behind the second landing unit 9. A wall panel 2 is provided between the first straight staircase unit 6 and the second straight staircase unit 7.

[0099] As shown in Figure 19, a side wall 10 is provided between the staircase SR and an adjacent room NR, which is a room provided on the lower floor (the lower floor of the upper and lower floors connected by the stairs 1) and adjacent to the staircase SR. Specifically, the side wall 10 is provided between the first straight staircase unit 6 and the first landing unit 8 and the adjacent room NR. Of the side walls 10, the upper end of the first side wall 10a located between the first straight staircase unit 6 and the adjacent room NR is inclined to match the gradient of the first straight staircase unit 6, and a handrail 20 is erected at the upper end of the first side wall 10a. Of the side walls 10, the second side wall 10b provided between the first landing unit 8 and the adjacent room NR has a horizontal upper end, and a glass wall 30 is erected at the upper end of the second side wall 10b. As shown in Figure 21, the glass wall 30 is in contact with the ceiling 4 located above the side wall 10.

[0100] The handrail 20 is a glass handrail comprising a plurality of glass plate portions 21 and a coping 22 provided along the upper edge portions of the plurality of glass plate portions 21. As shown in Figure 22, the portion of the upper end of the handrail 20 that corresponds to a position halfway up and down the first straight staircase unit 6 is inclined to match the gradient of the first straight staircase unit 6, while the remaining portion, i.e., the portion that corresponds to a position above the first straight staircase unit 6 in the up and down direction (in this embodiment, the portion that corresponds to the top step of the first straight staircase unit 6), is horizontal. This horizontal portion is in contact with the ceiling 4 located above the side wall 10. This gives the impression that the upper end of the handrail 20 is being pulled into the ceiling 4 when looking towards the staircase SR from the adjacent room NR side. Hereinafter, the ascending / descending direction of the first straight stair unit 6 may be simply referred to as the "ascending / descending direction."

[0101] The glass plate portion 21 is formed in a substantially parallelogram shape with its upper and lower ends inclined relative to the horizontal direction to match the gradient of the first straight staircase unit 6. The rear portion of the lower end of the glass plate portion 21 that is located furthest to the rear (lower in the lifting direction) among the plurality of glass plate portions 21 is horizontally chamfered. The front portion of the upper end of the glass plate portion 21 located furthest forward (uppermost in the lifting direction) among the plurality of glass plate portions 21 is chamfered horizontally. This chamfered portion is in contact with the ceiling 4 located above the side wall 10.

[0102] Of the side walls 10, the first side wall 10a, which is provided between the first straight staircase unit 6 and the adjacent room NR, is configured to include at least a support metal fitting 11 that supports the glass plate portion 21 of the handrail 20, a pair of cover members 12, 13 that support the support metal fitting 11 by sandwiching it from both the left and right sides, and a base member 14 that supports the support metal fitting 11 from below.

[0103] The support metal fittings 11 are generally U-shaped members that are open at the top, and as shown in FIG. 23, a plurality of support metal fittings 11 (three in this embodiment) are provided for one glass plate portion 21. As shown in Figures 24 and 25, the support hardware 11 comprises a bottom plate 111 fixed to the base member 14 and a pair of side plates 112 standing upright from the bottom plate 111, and the upper surface of the bottom plate 111 and the inner surfaces of the pair of side plates 112 form an approximately U-shaped recess 113 that is open at the top.

[0104] The support metal fitting 11 is fixed to the glass plate portion 21 by caulking or the like, with the lower end of the glass plate portion 21 inserted into the recess 113. In this embodiment, the support metal fittings 11 are delivered to the construction site in a state in which they are fixed in advance to a specified position on the glass plate portion 21 by a caulking process or the like. In other words, the support metal fittings 11 and the glass plate portion 21 are integrated in advance at the factory and delivered to the construction site in this integrated state. A buffer material 15 is provided between the bottom surface of the recess 113 (i.e., the upper surface of the bottom plate 111) and the glass plate portion 21. This makes it possible to prevent the glass plate portion 21 from colliding with the support metal fittings 11 (particularly the bottom plate 111) or the base member 14.

[0105] The bottom plate 111 has a rectangular plate shape, and its rear end protrudes further rearward than the side plates 112. The rear end is provided with a plurality of through holes 114 through which fasteners (such as screws) are inserted to fix the support metal fitting 11 to the base member 14. The through hole 114 is provided in the right end portion (the end portion on the side of the adjacent room NR) of the bottom plate 111. In other words, the through hole 114 is provided in a position that is not directly below the glass plate portion 21 supported by the support metal fitting 11. This makes it possible to prevent the glass plate portion 21 from getting in the way when fixing the support metal fitting 11 to the base member 14. In other words, the support metal fitting 11 that is integral with the glass plate portion 21 can be fixed to the base member 14 without the glass plate portion 21 getting in the way; specifically, a fixing tool can be driven from above the through hole 114 toward the base member 14 to fix the support metal fitting 11 to the base member 14.

[0106] The side plates 112 are rectangular. Of the pair of side plates 112, one side plate 112 stands on the left end of the upper surface of the bottom plate 111, and the outer surface of this side plate 112 and the left end surface of the bottom plate 111 are approximately flush with each other. Furthermore, the other side plate 112 stands on the right end of the upper surface of the bottom plate 111, and the outer surface of this side plate 112 and the right end surface of the bottom plate 111 are approximately flush with each other.

[0107] Of the pair of cover members 12, 13, the first cover member 12 provided on the left side (staircase chamber SR side) is configured to include a cover main body portion 121 that covers the entire width of the lower end portion of the glass plate portion 21, and a positioning portion 122 for positioning the glass plate portion 21. Furthermore, of the pair of cover members 12, 13, the second cover member 13 provided on the right side (neighboring room NR side) is configured to include a cover main body portion 131 that covers the entire width of the lower end portion of the glass plate portion 21, and a positioning portion 132 for positioning the second cover member 13.

[0108] The cover main bodies 121, 131 are formed in a generally parallelogram shape with their upper and lower ends inclined relative to the horizontal to match the gradient of the first straight stair unit 6. The front portions of the upper ends of the cover main bodies 121, 131 are horizontally chamfered. The rear portions of the lower ends of the cover main bodies 121, 131 are horizontally chamfered so as to abut against the floor. In this embodiment, the cover body 121 of the first cover member 12 is made of MDF (Medium Density Fiberboard) having a thickness of 18 mm, but is not limited to this. Also, in this embodiment, the cover body 131 of the second cover member 13 is made of MDF having a thickness of 15 mm, but is not limited to this.

[0109] A plurality of positioning portions 122 are fixed to the upper end of the right surface (the surface facing the adjacent room NR) of the cover main body portion 121 of the first cover member 12. These multiple positioning portions 122 are arranged along the ascending and descending direction of the first straight stair unit 6, with "specific gaps" between them. As shown in Figure 23, seven positioning portions 122 are provided on the first cover member 12 of this embodiment, so the number of "specific gaps" in the first cover member 12 is six.

[0110] In addition, a plurality of positioning portions 132 are fixed to the upper end of the left surface (the surface facing the staircase SR) of the cover main body portion 131 of the second cover member 13. These multiple positioning portions 132 are lined up along the ascending and descending direction of the first straight stair unit 6, with "specific gaps" between them. In this embodiment, seven positioning portions 132 are provided on the second cover member 13, so the number of "specific gaps" in the second cover member 13 is six.

[0111] The dimension of the "specific gap" is set to be approximately the same as the width dimension W1 of the side plate 112 of the support metal fitting 11. In this embodiment, the width W1 of the side plate 112 is set to 150 mm, and the dimension of the "specific gap" in this embodiment is set to 150 mm, but this is not limited to this.

[0112] In addition, each position of the "specific gap" is set to a position corresponding to each support metal fitting 11 when the multiple support metal fittings 11 integrally formed on the glass plate portion 21 are sandwiched between the cover members 12 and 13. Therefore, when the plurality of support metal fittings 11 integrally provided on the glass plate portion 21 are sandwiched between the cover members 12 and 13, the positioning portions 122 and 132 fit between the adjacent support metal fittings 11.

[0113] In other words, when multiple support metal fittings 11 integrally formed on the glass plate portion 21 are sandwiched between the cover members 12 and 13, the side plates 112 (left side plate 112) of the support metal fittings 11 each fit between adjacent positioning portions 122 in the first cover member 12, and the side plates 112 (right side plate 112) of the support metal fittings 11 each fit between adjacent positioning portions 132 in the second cover member 13. In this embodiment, the positioning portions 122 and 132 are made of plywood with a thickness of 15 mm, but are not limited to this.

[0114] The base member 14 is disposed between the cover members 12 and 13, and the support metal fitting 11 is fixed to the upper surface of the base member 14. The width dimension of the base member 14 is set to be slightly larger than the width dimension W2 of the support metal fitting 11. In this embodiment, the width dimension W2 of the support metal fitting 11 is set to 54 mm, and the width dimension of the base member 14 in this embodiment is set to 56 mm, but this is not limited to this.

[0115] The base member 14 consists of multiple (two in this embodiment) support members 141. The upper and lower end faces of the support members 141 are inclined to match the gradient of the first straight stair unit 6, and the front end face (the upper end face in the lifting direction) of the base member 14 is perpendicular to the horizontal direction, and the rear end face (the lower end face in the lifting direction) of the base member 14 is parallel to the horizontal direction so as to abut against the floor. In this embodiment, the receiving material 141 is a softwood plywood having a thickness of 28 mm, but is not limited to this.

[0116] The glass wall 30 is provided contiguous with the glass plate portion 21 of the handrail 20 and is made of the same glass plate as the glass plate portion 21. The upper end of the glass wall 30 is horizontal and is approximately flush with the horizontal portion at the upper end of the handrail 20. In other words, the upper end of the glass wall 30 is in contact with the ceiling 4 located above the side wall 10.

[0117] <Handrail installation method> Next, a method for constructing the handrail 20 will be described with reference to Figures 26 to 30. For the sake of convenience, the fire-resistant covering material 5 is not shown in Figures 26 to 30.

[0118] First, the support metal fitting 11 is attached to the lower end of the glass plate portion 21 at a specified position in a factory or the like. Specifically, the lower end of the glass plate 21 is inserted into the recess 113 of the support metal fitting 11, and the recess 113 is filled with caulking material while the lower end of the glass plate 21 is in contact with the buffer material 15 arranged on the bottom surface of the recess 113. That is, in this embodiment, caulking material is used as a fixing means for fixing the support metal fitting 11 to the glass plate 21, but the present invention is not limited to this.

[0119] Furthermore, in a factory or the like, the positioning portions 122, 132 are attached to designated positions on the cover main bodies 121, 131 to fabricate the cover members 12, 13. The fixing means for fixing the positioning portions 122, 132 to the cover main bodies 121, 131 may be a fixing material (such as a screw), an adhesive, or a combination of these. Furthermore, in a factory or the like, a plurality of receiving materials 141 are joined together to produce the base member 14. The fixing means for fixing one receiving material 141 to another receiving material 141 may be a fixing material (such as a screw), an adhesive, or a combination of these.

[0120] Next, the glass plate portion 21 with the plurality of support metal fittings 11 attached thereto, the cover members 12 and 13, and the base member 14 are transported from a factory or the like to a construction site (transportation step). Similarly, the straight staircase units 6, 7 and landing units 8, 9 that make up the staircase 1 are also pre-assembled in a factory or the like and then transported to the construction site.

[0121] At the construction site, after the foundation work is completed, the framework assembly work begins. During the assembly work, the architectural panels, columns, beams, etc. that make up the stairwell SR and adjacent room NR are assembled. After the skeleton assembly work is completed, the fire-resistant covering material 5 is attached to the surface of the skeleton. The fixing means for fixing the fire-resistant covering material 5 to the skeleton may be a fixing material (such as a screw), an adhesive, or a combination of these. Next, install units 6 to 9 in the stairwell SR.

[0122] Next, handrail installation work is carried out between the staircase SR and the adjacent room NR, in which the handrail 20 and the support structure (first side wall 10a) that supports it are installed. Specifically, in the handrail installation work, first, as shown in Figures 26 and 27, the first cover member 12 is fixed to the right side (the side facing the adjacent room NR) of the first straight staircase unit 6 installed in the staircase SR (first fixing step). The fixing means for fixing the first cover member 12 to the first straight staircase unit 6 may be a fixing tool (such as a screw), an adhesive, or a combination of these. In this embodiment, the first cover member 12 is fixed to the first straight stair unit 6 via a fire-resistant covering material 5. In other words, the first cover member 12 is fixed to the first straight stair unit 6 with the fire-resistant covering material 5 arranged between the first straight stair unit 6 and the first cover member 12.

[0123] As shown in Figure 26, the first straight staircase unit 6 comprises left and right stringers 61 which serve as the side panels of the first straight staircase unit 6, a plurality of step plates 62 which are arranged in stages between the stringers 61 to form the treads, and a plurality of risers 63 which are arranged between the plurality of step plates 62 and below the lowest step plate 62. Furthermore, a support plate 64 is attached to the stringer 61 on the right side (neighboring room NR side) of the first straight staircase unit 6, which supports from below the fire-resistant covering material 5 (see Figure 5) which is arranged between the first straight staircase unit 6 and the first support member 102. The support plate 64 is not shown in Figure 26.

[0124] 27 and 28, the base member 14 is fixed to the lower end of the right surface (surface on the side of the adjacent room NR) of the first cover member 12 (attachment step). The fixing means for fixing the base member 14 to the first cover member 12 may be a fixing tool (such as a screw), an adhesive, or a combination of these.

[0125] 28 and 29, the plurality of support metal fittings 11 attached to the glass plate portion 21 are fixed to the upper surface of the base member 14 (placing step). Specifically, the left side plate 112 of the support metal fitting 11 is fitted between the positioning portions 122 of the first cover member 12, and the left side plate 112 is brought into contact with the right surface (the surface on the adjacent room NR side) of the cover main body portion 121 of the first cover member 12, and the bottom plate 111 of the support metal fitting 11 is brought into contact with the upper surface of the base member 14. In this state, fasteners (screws or the like) are driven into the through holes 114 provided in the support metal fitting 11 from above toward the base member 14, thereby fixing the support metal fittings 11 attached to the glass plate portion 21 to the base member 14.

[0126] As described above, in this embodiment, the support metal fittings 11 can be positioned relative to the first cover member 12, i.e., the glass plate portion 21 can be positioned relative to the first cover member 12, simply by fitting the support metal fittings 11 between adjacent positioning portions 122 in the first cover member 12. Therefore, since the support metal fittings 11 (and the glass plate portion 21) are easily positioned, workability can be improved when fixing multiple support metal fittings 11 that are integrally provided on the glass plate portion 21.

[0127] 29 and 30 , the second cover member 13 is fixed to the right surface (surface facing the adjacent room NR) of the base member 14 (second fixing step). Specifically, the positioning portion 132 of the second cover member 13 is fitted between the right side plates 112 of the multiple support metal fittings 11 attached to the glass plate portion 21, and the cover main body portion 131 of the second cover member 13 is brought into contact with the right surface (surface facing the adjacent room NR) of the right side plate 112, and the rear portion (horizontal portion) of the lower end of the cover main body portion 131 is brought into contact with the floor surface, and in this state, the second cover member 13 is fixed to the base member 14. The fixing means for fixing the second cover member 13 to the base member 14 may be a fixing tool (such as a screw), an adhesive, or a combination of these.

[0128] As described above, in this embodiment, the second cover member 13 can be positioned relative to the first cover member 12 simply by fitting the positioning portions 132 of the second cover member 13 between adjacent support metal fittings 11. Therefore, since the second cover member 13 is easily positioned, the workability when fixing the second cover member 13 can be improved.

[0129] Next, the right surface (the surface facing the adjacent room NR) of the second cover member 13 is covered with the fire-resistant covering material 5. The fixing means for fixing the fire-resistant covering material 5 to the second cover member 13 may be a fixing material (such as a screw), an adhesive, or a combination of these. Then, decorative material 16 is attached to the upper and front end surfaces of first cover member 12 and the upper and front end surfaces of second cover member 13. That is, decorative material 16 is attached to the upper and front end surfaces of first side wall 10a. Decorative material 16 is also attached to the upper end surface of second side wall 10b. The fixing means for fixing decorative material 16 to side wall 10 may be a fixing tool (such as a screw), an adhesive, or a combination of these.

[0130] In addition, a coping 22 is attached to the upper edge of the glass plate portion 21. In this embodiment, the horizontal portion of the upper edge of the glass plate portion 21 is in contact with the ceiling 4 located above the side wall 10, and therefore the coping 22 is attached to the portion other than the horizontal portion, i.e., the inclined portion of the upper edge of the glass plate portion 21. This allows the handrail 20 and the support structure (first side wall 10a) that supports it to be installed between the staircase SR and the adjacent room NR.

[0131] In addition, decorative members (decorative steps, decorative risers) are attached to the surface of the stairs 1. In Figures 21 and 22, the members with diagonal grid hatching are the decorative members of the stairs 1 (decorative steps, decorative risers). In addition, wall interior materials such as wallpaper are attached to the surface (the surface on the staircase chamber SR side) of the fire-resistant covering material 5 (the fire-resistant covering material 5 provided between the first straight staircase unit 6 and the first covering member 12) covering the first covering member 12, and the surface (the surface on the adjacent room NR side) of the fire-resistant covering material 5 covering the second covering member 13.

[0132] "effect" According to the second embodiment, the following excellent effects are achieved. Specifically, the support structure of the handrail 20 in this embodiment is a support structure for the handrail 20 that has a plate material (glass plate portion 21) that is erected between the first space (staircase SR) and the second space (adjacent room NR), and is equipped with a first support member (first cover member 12) that is arranged on the first space side and a second support member (second cover member 13) that is arranged on the second space side, and is configured so that the first support member and the second support member sandwich and support the lower end of the plate material from both the first space side and the second space side.

[0133] That is, the pair of support members (the pair of cover members 12, 13) can sandwich and support the lower end of the plate (glass plate portion 21) from both the first space (staircase chamber SR) side and the second space (adjacent room NR) side. This prevents the plate from swaying sideways, making it possible to maintain a more stable support state for supporting the handrail 20.

[0134] Specifically, the support structure for handrail 20 in this embodiment is a support structure for handrail 20 equipped with a plate (glass plate portion 21) erected between a first space (staircase SR) and a second space (adjacent room NR) adjacent to the first space, and includes support metal 11 that supports the plate, and a pair of cover members 12, 13 that cover the lower end of the plate. Support metal 11 has a generally U-shaped recess 113 that is open at the top, and is attached to the lower end of the plate with the lower end inserted into said recess 113, and the pair of cover members 12, 13 sandwich the lower end of the plate and support metal 11 attached to said lower end from both the first space side and the second space side.

[0135] Therefore, not only the lower end of the plate (glass plate portion 21), but also the support metal fittings 11 attached to said lower end can be sandwiched from both the first space (staircase chamber SR) side and the second space (adjacent room NR) side by the pair of cover members 12, 13. This prevents the support metal fittings 11 from swaying sideways, so that the support metal fittings 11 can be maintained in a firmly fixed state. As a result, even when the lower end of the handrail 20 (the lower end of the glass plate portion 21) is supported by the support metal fittings 11, it is possible to maintain a more stable support state for the handrail 20.

[0136] The plate material is not limited to a transparent glass plate (glass plate portion 21), but may be a translucent or opaque glass plate, an acrylic plate, a wooden plate, etc. From the viewpoint of making it possible to see (including unclear visibility (dim visibility)) the inside of the first space (staircase SR) from inside the second space (adjacent room NR) through the plate material and making it difficult to feel the narrowness of the second space even if it is narrow, the plate material is preferably a light-transmitting plate-like member. Furthermore, the first space is not limited to the stairwell SR (the inclined portion of the stairwell SR), but may also be a landing (the horizontal portion of the stairwell SR), an upper floor, an intermediate floor between the upper floor and the lower floor, etc. In other words, the handrail 20 is not limited to a handrail with a slanted upper end, but may also be a handrail with a horizontal upper end (the majority of the upper end).

[0137] 20 and other figures, in this embodiment, since the second space (adjacent room NR) is located to the right of the first space (staircase SR), the through-hole 114 of the support metal 11 is provided at the right end of the bottom plate 111 of the support metal 11, but this is not limited to this. For example, if the second space (adjacent room NR) is located to the left of the first space (staircase SR), the through-hole 114 would be provided at the left end of the bottom plate 111 of the support metal 11. Furthermore, for example, as shown in Figure 31, it is possible to provide through holes 114 on both the right and left ends of the bottom plate 111, making it possible to make the support hardware 11 usable whether the second space (adjacent room NR) is located to the right or left of the first space (staircase chamber SR). In addition, in this embodiment, the rear end of the bottom plate 111 of the support metal fitting 11 protrudes further rearward than the side plate 112, but this is not limited to this. The support metal fitting 11 may, for example, be one in which the front end of the bottom plate 111 protrudes further forward than the side plate 112, or, for example, as shown in Figure 32, the rear end of the bottom plate 111 may protrude further rearward than the side plate 112 and the front end of the bottom plate 111 may protrude further forward than the side plate 112.

[0138] Furthermore, the support structure of the handrail 20 in this embodiment includes a base member 14 that supports the support metal fittings 11, and the support metal fittings 11 are fixed to the upper surface of the base member 14. A pair of cover members 12, 13 can sandwich the lower end of the plate material (glass plate portion 21), the support metal fittings 11 attached to the lower end, and the base member 14 to which the support metal fittings 11 are fixed on the upper surface from both the first space (staircase chamber SR) side and the second space (adjacent room NR) side.

[0139] With this configuration, not only the lower end of the plate (glass plate portion 21) and the support metal fittings 11 attached to said lower end, but also the base member 14 supporting said support metal fittings 11 can be sandwiched from both the first space (staircase chamber SR) side and the second space (adjacent room NR) side by the pair of cover members 12, 13. This reliably prevents the support metal fittings 11 from swaying sideways, so that the support metal fittings 11 can be maintained in a firmly fixed state. As a result, even when the lower end of the handrail 20 (the lower end of the glass plate portion 21) is supported by the support metal fittings 11, a more stable support state can be maintained for the handrail 20.

[0140] In addition, in the support structure of the handrail 20 in this embodiment, the cover members 12, 13 are provided with multiple protrusions (positioning portions 122, 132) aligned in the width direction of the plate (glass plate portion 21) (the ascending and descending direction of the first straight stair unit 6), and the support metal fitting 11 can be attached to the lower end of the plate in a position where it fits between adjacent protrusions.

[0141] With this configuration, the support metal 11 attached to the lower end of the plate (glass plate portion 21) can be sandwiched from both sides in the width direction of the plate by the protrusions of the cover members 12 and 13. Specifically, the support metal 11 can be sandwiched from both sides in the width direction of the plate (the ascending and descending direction of the first straight stair unit 6) by adjacent protrusions (positioning portions 122) of the first cover member 12, and the support metal 11 can be sandwiched from both sides in the width direction of the plate (the ascending and descending direction of the first straight stair unit 6) by adjacent protrusions (positioning portions 132) of the second cover member 13. This prevents the support metal 11 from shaking (shaking in the width direction of the plate), allowing the support metal 11 to be maintained in a firmly fixed state. As a result, even when the lower end of the handrail 20 (the lower end of the glass plate portion 21) is supported by the support metal 11, a more stable support state for the handrail 20 can be maintained.

[0142] In addition, the construction method for the support structure of the handrail 20 in this embodiment is a construction method for a handrail 20 equipped with a plate material (glass plate portion 21) that is erected between a first space (staircase SR) and a second space (adjacent room NR), and is configured to include an attachment step of attaching a base member 104 to a first support member (first cover member 12), a first fixing step of fixing the first support member to a structure (first straight stair unit 6) to be installed in the first space, a placement step of placing the plate material on the base member 14, and a second fixing step of fixing a second support member (second cover member 13) to the structure via the first support member while it is positioned on the second space side of the plate material on the base member 14.

[0143] That is, the pair of support members (the pair of cover members 12, 13) can sandwich and support the lower end of the plate (glass plate portion 21) from both the first space (staircase chamber SR) side and the second space (adjacent room NR) side. This prevents the plate from swaying sideways, making it possible to maintain a more stable support state for supporting the handrail 20.

[0144] Specifically, the construction method for the handrail 20 in this embodiment is a construction method for a handrail 20 having a plate material (glass plate portion 21) that is erected between a first space (staircase chamber SR) and a second space (adjacent room NR) adjacent to the first space, in which, in a first fixing step, one cover member (first cover member 12) of a pair of cover members 12, 13 that cover the lower end of the plate material is fixed to a structure (first straight stair unit 6) installed in the first space, in an installation step, a base member 14 is fixed to the lower end of one of the cover members, in a placing step, a support metal member 11 attached to a designated position at the lower end of the plate material is fixed in a state in which it is abutting against the surface of one of the cover members facing the second space and the upper surface of the base member 14, and in a second fixing step, the other cover member (second cover member 13) of the pair of cover members 12, 13 is fixed in a state in which it is abutting against the surface of the support metal member 11 facing the second space.

[0145] Therefore, not only the lower end of the plate (glass plate portion 21), but also the support metal 11 attached to said lower end can be sandwiched from both the first space (staircase chamber SR) side and the second space (adjacent room NR) side by the pair of cover members 12, 13. This prevents the support metal 11 from swaying sideways, so that the support metal 11 can be maintained in a firmly fixed state. As a result, even when the lower end of the handrail 20 (the lower end of the glass plate portion 21) is supported by the support metal 11, it is possible to maintain a more stable support state for the handrail 20.

[0146] As mentioned above, the first space is not limited to the staircase SR (the inclined portion of the staircase SR), but may also be a landing (the horizontal portion of the staircase SR), an upper floor, an intermediate floor between the upper floor and the lower floor, etc. In other words, the structure installed in the first space is not limited to a straight staircase unit. For example, if the first space is a landing, the structure installed in the first space is a landing unit, etc., and if the first space is an upper floor or an intermediate floor between the upper floor and the lower floor, the structure installed in the first space is a structural member that constitutes the ceiling of the lower floor or the floor of the upper floor (intermediate floor), etc.

[0147] Furthermore, in the construction method of the handrail 20 in this embodiment, a base member 14 supporting the support metal fittings 11 is fixed to the surface of one of the cover members (first cover member 12) facing the second space, and in the placement step, the support metal fittings 11 are fixed to the upper surface of the base member 14, and in the second fixing step, the other cover member (second cover member 13) can be fixed to the surface of the base member 14 facing the second space.

[0148] With this configuration, not only the lower end of the plate (glass plate portion 21) and the support metal fittings 11 attached to said lower end, but also the base member 14 supporting said support metal fittings 11 can be sandwiched from both the first space (staircase chamber SR) side and the second space (adjacent room NR) side by the pair of cover members 12, 13. This reliably prevents the support metal fittings 11 from swaying sideways, so that the support metal fittings 11 can be maintained in a firmly fixed state. As a result, even when the lower end of the handrail 20 (the lower end of the plate (glass plate portion 21)) is supported by the support metal fittings 11, a more stable support state can be maintained for the handrail 20.

[0149] Furthermore, in recent years, there has been a demand for the realization of a carbon-neutral society by promoting carbon neutrality, which reduces carbon dioxide emissions to virtually zero, and for the achievement of the SDGs (Sustainable Development Goals), and in the construction industry, efforts are being made to build buildings using wood, which reduces carbon dioxide emissions. The support structure of the handrail 20 in the second embodiment is made of wood except for the support metal fittings 11 (cover members 12, 13 and base member 14), so it can contribute to the realization of a carbon-neutral society by promoting carbon neutrality and the achievement of the SDGs. Furthermore, the support structure and construction method of the handrail 20 in the second embodiment are suitable for energy-saving homes, and therefore can contribute to the realization of a decarbonized society through the promotion of carbon neutrality and the achievement of the SDGs from the perspective of energy consumption efficiency in homes. The configurations of the above-described embodiments can be applied in appropriate combinations. [Explanation of symbols]

[0150] 6 First straight staircase unit (structure) 12 First cover member (support member) 13 Second cover member (support member) 20 Handrail 21 Glass plate part (plate material) 102 First support member (support member) 103 Second support member (support member) 104 Base member 200 Spacer material 201 Glass plate (plate material) 1031 Lower split material (split material) 1032 Center dividing material (dividing material) 1033 Upper split material (split material) SR Staircase (first space) NR Next door (Second section) W24, W25 Width of the overlapping part between the second dividing member and the first plate

Claims

1. A handrail support structure having a plate member erected between a first space and a second space, a first support member disposed on the first space side; a second support member disposed on the second space side, A support structure characterized in that the first support member and the second support member sandwich and support the lower end of the plate material from both the first space side and the second space side.

2. 2. The support structure of claim 1, The handrail includes a plurality of the plate members arranged along an extending direction of the handrail, The second support member is composed of a plurality of divided members arranged along the extension direction, the plurality of dividers include a first divider and a second divider adjacent to the first divider, the plurality of plate members include a first plate member and a second plate member adjacent to the first plate member, the first divided member supports the first plate member by sandwiching it between the first divided member and the first support member, A support structure characterized in that the second divided member supports the first plate member and the second plate member by sandwiching them between the second divided member and the first support member.

3. 3. The support structure of claim 2, A support structure characterized in that the width dimension of the overlapping portion between the second divided member and the first plate member is set to be at least twice the thickness dimension of the plate member.

4. A method for constructing a handrail having a plate member erected between a first space and a second space, an attachment step of attaching a base member to the first support member; a first fixing step of fixing the first support member to a structure installed in the first space; a placing step of placing the plate material on the base member; a second fixing step of fixing a second support member to the structure via the first support member while positioning the second support member closer to the second space than the plate material on the base member.

5. In the construction method according to claim 4, In the first fixing step, the first support member is fixed to the structure by screws, A construction method characterized in that in the second fixing step, the second support member and the plate material are fixed to the structure via the first support member by screwing them together.

6. In the construction method according to claim 4, The handrail includes a plurality of the plate members arranged along an extending direction of the handrail, The second support member is composed of a plurality of divided members arranged along the extension direction, After the first fixation step, performing the placing step of placing a first plate material of the plurality of plate materials on the base member; Next, a second fixing step is performed in which a first divided member among the plurality of divided members is fixed to the structure together with the first plate member via the first support member; Next, the placing step of placing a second plate material adjacent to the first plate material among the plurality of plate materials on the base member is performed; Next, a second fixing step is performed to fix a second dividing member adjacent to the first dividing member among the plurality of dividing members, together with the second plate member, to the structure via the first support member.

7. In the construction method according to claim 6, the first divided member supports the first plate member by sandwiching it between the first divided member and the first support member, A construction method characterized in that the second divided member supports the first plate member and the second plate member by sandwiching them between the second divided member and the first support member.

8. In the construction method according to claim 6, a spacer material is attached to an end surface of the first plate member that faces the second plate member; An installation method characterized in that the spacer material is removed after the second fixing step.

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