Stair substructure and stair construction method

Abstract

The present invention provides a stair base structure that facilitates the connection work when multiple divided sections are connected to form a side plate, and improves the accuracy of positioning the connection points between the divided sections, as well as a stair construction method for forming said stair base structure. [Solution] The stair base structure 1 has a side plate 2 which has a plurality of divided bodies 22 and a connecting plate 4 which connects the divided bodies 22 together. The connecting plate 4 includes a plate body 40 which abuts against and is fixed to the sides of two adjacent divided bodies 22, a guide member 41 which is formed along the longitudinal direction of the plate body 40 and abuts against the lower surfaces of two adjacent divided bodies 22, and a triangular plate 42 which is fixed to the middle of the longitudinal direction of the plate body 40 and aligns with the corner 28 formed by the lower end edge 26 of the upper divided body 22 and the vertical end edge 25 formed at the upper end of the lower divided body 22 and the guide member 41 when adjacent divided bodies 22 are butted together.

Description

Technical Field

[0001] The present invention relates to a staircase base structure and a staircase construction method for forming the staircase base structure.

Background Art

[0002] Conventionally, by forming side plates and girders of a staircase so that they can be divided into a plurality of parts, it is possible to facilitate on-site transportation and assemble various forms of staircases according to the shapes and situations of various staircase assembly sites using the same side plates, etc. (see Patent Document 1 and Patent Document 2).

[0003] When combining the side plates of Patent Document 1, a flat connecting plate is arranged at the outer part of two adjacent side plates, and a plurality of bolts are inserted, and they are fixed by tightening nuts on these bolts. Also, when combining the side plates of Patent Document 2, the side plates are connected to each other by fixing the end portions of the respective side plates adjacent to the columns provided at the positions where the side plates are joined.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when connecting adjacent side plates with a simple flat connecting plate as in Patent Document 1, the positioning accuracy of the connection between the side plates may be insufficient, and there is a risk that the workability may decrease, such as causing the trouble of rework. Also, when providing the joining portion of the side plates at the position where the column is provided as in Patent Document 2, in the case of a staircase that is open toward the side, it is impossible to provide a column, and there is a problem that the construction becomes difficult.

[0006] Therefore, the present invention aims to provide a stair base structure that facilitates the connection work when multiple divided parts are connected to form a side plate, and that improves the accuracy of positioning the connection points between the divided parts, as well as a stair construction method for forming said stair base structure. [Means for solving the problem]

[0007] The first invention, which solves the above problems, is a stair base structure that forms a staircase, comprising a side plate arranged along the slope of the staircase and having alternating rising portions for which risers are fixed and horizontal portions for which treads are fixed, wherein the side plate comprises a plurality of divided bodies divided in the direction of the slope of the staircase and a connecting plate that connects adjacent divided bodies, the connecting plate comprising a plate body formed in the direction of the slope of the staircase and fixed in contact with the sides of two adjacent divided bodies, a guide member formed along the longitudinal direction of the plate body and in contact with the lower surfaces of two adjacent divided bodies, and a triangular plate fixed to the middle of the plate body in the longitudinal direction and aligning with the guide member when adjacent divided bodies are brought together, the corner formed by the lower edge of the upper divided body and the vertical edge formed at the upper end of the lower divided body.

[0008] The second invention, which solves the above problems, further includes a frame to which an interior wall material is attached, having a runner fixed to the floor surface, a plurality of studs erected on the runner in succession, increasing in height along the stair slope, and an upper horizontal member connecting adjacent studs, wherein the studs have horizontal grooves on the side facing the lower side of the stair slope, and the upper horizontal member is horizontally erected with one end inserted into the groove of one of the adjacent studs and the other end fixed to the upper surface of the other stud.

[0009] The third invention, which solves the above problems, provides a stair base structure in which the frame can be divided into two or more frame parts on the upper and lower sides in the direction of travel of the stairs, and at the joint between the frame parts, a dowel hole is formed on the upper surface of the end of the lower runner, and a protrusion is formed on the upper surface of the upper runner that abuts against the upper surface of the lower runner, and a projection is formed on the lower surface of the protrusion that fits into the dowel hole.

[0010] The fourth invention, which solves the above problems, provides a stair base structure in which the dowel holes and projections are formed in a plurality of arrangements in the width direction of the stairs.

[0011] A fifth invention relating to a stair construction method for solving the above problems is a stair construction method for constructing a staircase by forming the above-described staircase base structure, and includes the steps of: manufacturing the frame in a factory; transporting the frame, a plurality of the divided parts, and the connecting plates to a construction site; connecting the plurality of the divided parts with the connecting plates to form the side plates; fixing the side plates to the structural frame of the building and arranging them along the staircase slope; installing the frame adjacent to the side plates; screwing the plate body of the side plates to the studs of the frame; fixing the step boards and risers to the side plates and attaching the interior wall material to the frame. [Effects of the Invention]

[0012] According to the stair base structure of the first invention, when connecting the divided side panels, the lower surfaces of the two divided panels are brought into contact with the guide member of the connecting plate, and the triangular plate is aligned with the guide member at the corner formed by the lower edge of the upper divided panel and the vertical edge formed at the upper end of the lower divided panel. This makes it extremely easy to position the two divided panels to connect, and improves the accuracy of the connection position of the two divided panels. Therefore, the side panels can be formed with high precision, and when the side panels are placed along the stair slope, they can be installed with precision, thus reducing the effort required for adjustment and enabling the formation of a stair base structure with high precision.

[0013] According to the stair base structure of the second invention, the upper horizontal member is horizontally installed by inserting one end into the groove of one of the adjacent studs and fixing the other end to the upper surface of the other stud. Therefore, the upper horizontal member extending to one side is fixed to the upper surface of one stud, and the end of the upper horizontal member extending to the other side is inserted into a groove formed on the side surface of the stud and fixed. Thus, the ends of the upper horizontal members on both sides can be fixed with a single stud, and the ends of the upper horizontal members on both sides can be fixed without having to place two studs of different heights adjacent to each other. This reduces the number of studs required for the frame and reduces material costs. Furthermore, by reducing the number of studs, the frame itself can be made lighter, making on-site delivery easier, and allowing for safe and easy construction even when the frame is installed at a high place. Moreover, since the upper horizontal members on both sides are fixed with a single stud, there is no risk of the ends of the upper horizontal members separating when the frame is lifted, and the bending of the runners forming the lower surface of the frame can be suppressed.

[0014] According to the stair base structure of the third invention, the frame can be divided into two or more frame parts for the upper and lower steps of the staircase, thus reducing the labor required for transportation and installation at the site. Furthermore, at the joints between the frame parts, a dowel hole is formed on the upper surface of the end of the lower step runner, and a protrusion is formed on the upper surface of the upper step runner that abuts against the upper surface of the lower step runner, and a projection is formed on the lower surface of the protrusion that fits into the dowel hole, so that the frame can be formed easily and with high precision.

[0015] According to the stair substructure of the fourth invention, since multiple dowel holes and protrusions are formed in a row in the width direction of the stairs, the straightness accuracy of the frame can be improved, and even a stair substructure that is open to the sides without partition walls can be formed with high precision.

[0016] According to the staircase construction method according to the fifth invention, since the frame is manufactured in the factory and transported to the site, the construction accuracy of the staircase foundation structure can be improved and the on-site construction work can be facilitated. The side plates are divided into a plurality of divided bodies and connecting plates and transported to the construction site, so that the transportation work becomes easy. In addition, since the divided bodies are connected using the connecting plates to form the side plates, the work of forming the side plates can be simplified and the accuracy of the work of forming the side plates can be improved. Then, since the frame and the side plates formed with high accuracy are fixed to form the staircase foundation structure, the construction property of the staircase can be improved while forming a staircase with high accuracy.

Brief Description of the Drawings

[0017] [Figure 1] Front view for explaining the configuration of the connecting plate. [Figure 2] Side view for explaining the configuration of the connecting plate. [Figure 3] Exploded perspective view for explaining the configuration of the connecting plate. [Figure 4] Perspective view for explaining the configuration of the connecting plate. [Figure 5] Perspective view for explaining the state before connecting two divided bodies using the connecting plate. [Figure 6] Cross-sectional view for explaining the state before connecting two divided bodies using the connecting plate. [Figure 7] Perspective view seen from the guide member side of the connecting plate for explaining the side plate formed by connecting two divided bodies. [Figure 8] Perspective view seen from the plate body side of the connecting plate for explaining the side plate formed by connecting two divided bodies. [Figure 9] Perspective view for explaining the configuration of two frame split bodies. [Figure 10] (A) is a side view for explaining the overall configuration of two frame split bodies, (B) is an enlarged view of the α part of (A), and (C) is a cross-sectional view taken along the β line of (B). [Figure 11] Perspective view for explaining the frame formed by joining two frame split bodies. [Figure 12]A perspective view for explaining a state in which a frame and side plates are arranged adjacent to each other and the plate body of the side plate and the stud of the frame are fixed with screws. [Figure 13] A perspective view for explaining a state in which a step plate and a kick-in plate are fixed to a side plate and an inner wall material is attached to a frame.

Embodiments for Carrying Out the Invention

[0018] Hereinafter, embodiments of the staircase base structure and the staircase construction method of the present invention will be described. The staircase base structure 1 is, for example, a staircase base structure 1 for forming a staircase connecting the upper and lower floors of a detached house. The staircase base structure 1 is not limited to being provided in a detached house, and can be provided in various buildings provided with a wooden staircase base structure 1 such as an apartment house or various facilities.

[0019] 〔Regarding the staircase formed by the staircase base structure〕 As shown in FIG. 13, the staircase formed by the staircase base structure 1 of the present embodiment has at least one side in the width direction of the staircase open without being partitioned. Note that the staircase base structure 1 may have both sides in the width direction of the staircase open. Further, although the staircase base structure 1 and the staircase construction method of the present embodiment form a straight staircase, the staircase base structure 1 and the staircase construction method are not limited thereto, and as long as the staircase has a portion where at least a part of the straight staircase is formed, it may be a staircase such as a winding staircase, a circular staircase, or a return staircase. At least, it is sufficient that the straight staircase portion of the staircase is open without a partition wall 8 provided in one direction in the width direction.

[0020] 〔Regarding the staircase base structure〕 The stair substructure 1 includes two side plates 2 arranged along the stair slope and a frame 3 installed at the open end in the width direction of the stair. The side plates 2 are installed diagonally along the stair slope, with their upper ends fixed to beams (not shown) of the building and their lower ends fixed to foundations or beams (not shown) of the building. The side plates 2 are formed in a staircase shape by alternately providing rising sections 20 and horizontal sections 21 on the upper edge side, with risers 6 fixed to the rising sections 20 and treads 5 fixed to the horizontal sections 21 to form the staircase.

[0021] [Regarding side panels and divided sections] As shown in Figures 5 to 8, the side panel 2 has multiple sections 22 divided in the direction of the stair slope, and connecting plates 4 that connect adjacent sections 22. The sections 22 are made of wood, and for example, the upper edge is formed in four steps by alternating between a rising section 20 and a horizontal section 21, and the lower edge 24 is formed in a straight line along the direction of the stair slope. The upper end of the section 22 in the longitudinal direction forms a vertical edge 25, and the lower end of the side panel 2 in the longitudinal direction forms a horizontal lower edge 26. Each section 22 is formed adjacent to the horizontal section 21 and is provided with a support beam 27 for fixing the stair board 5. The support beam 27 is a horizontal square timber and serves as a base for fixing the stair board 5.

[0022] [Regarding connecting plates] As shown in Figures 1 to 4, the connecting plate 4 comprises a plate body 40 formed in the shape of a long, flat plate in the direction of the stair slope, a guide member 41 formed along the longitudinal direction of the plate body 40, and a triangular plate 42 fixed to the middle of the plate body 40 in the longitudinal direction. The plate body 40 is a rectangular wooden flat plate, formed to a length of, for example, about four times the length of the horizontal portion 21 of the side plate 2. The guide member 41 is a long metal material, formed in the shape of an L when viewed in cross-section, consisting of a short side 43 and a long side 44. The triangular plate 42 is a wooden flat plate with a triangular outer circumference. The triangular plate 42 is in contact with the plate body 40, and is positioned so that one side of the triangular plate 42 overlaps with the lower surface of the plate body 40. The guide member 41 has a short side 43 that abuts against the surface of the triangular plate 42 opposite to the surface that abuts against the plate body 40, and the long side 44 of the guide member 41 abuts against the lower surface of the plate body 40 and one side of the triangular plate 42. The long side 44 of the guide member 41 has a width longer than the thickness of the plate body 40 and the triangular plate 42, and is formed to protrude from the plate body 40 and the triangular plate 42 in the thickness direction. The short side 43 of the guide member 41 is formed with a gap 45 between it and the plate body 40, with the triangular plate 42 in between. In this embodiment, the plate body 40, the triangular plate 42, and the guide member 41 are bonded together and fixed to each other by screws driven in from the short side 43 of the guide member 41. The fixing of the plate body 40, the triangular plate 42, and the guide member 41 is not limited to this.

[0023] [Regarding the connection of divided parts] The connecting plate 4 connects two adjacent divided bodies 22 by having its plate body 40 abut against and fix to the sides of the two divided bodies 22. The two divided bodies 22 are inserted into the gap 45 between the plate body 40 and the short side 43 of the guide member 41, and are positioned so that the lower edges 24 of the two divided bodies 22 abut against the long side 44 of the guide member 41 to connect them. The adjacent divided bodies 22 are abutted together such that a part of the horizontal lower surface of the upper divided body 22 abuts against a part of the uppermost horizontal portion 21 of the upper edge of the lower divided body 22. At this time, a corner portion 28 is formed by the lower end edge 26 of the upper divided body 22 and the vertical end edge 25 formed at the upper end of the lower divided body 22. The triangular plate 42 aligns with the corner 28 formed by the lower edges 26 and vertical edges 25 of adjacent divided bodies 22, with each side abutting against the long side 44 of the guide member 41. In other words, the triangular plate 42 has the same shape as the triangle formed by the lower edge 26 of the upper divided body 22, the vertical edge 25 formed at the upper end of the lower divided body 22, and the guide member 41. By aligning with these, the relative positions of the upper and lower divided bodies 22 and the connecting plate 4 are positioned appropriately. Therefore, since the two divided bodies 22 are on the same plane and their lower surfaces are aligned linearly along the direction of the stair slope, the side plate 2 can be reliably connected to the designed shape with simple work.

[0024] [About the frame] As shown in Figures 9 to 11, frame 3 has a runner 30 fixed to the floor surface, a plurality of studs 31 erected on the runner 30 in succession along the stair slope, and a plurality of upper horizontal members 32 connecting adjacent studs 31, and is formed on the underside of a position that is open to one side in the width direction of the stairs. An interior wall material 7 is attached to frame 3 to close the space under the stairs. Frame 3 forms multiple steps by arranging the upper horizontal members 32 in succession along the stair slope. Frame 3 may also be formed by joining multiple frame sections 34 of different heights. For example, a frame section 34 may have five upper horizontal members 32 arranged to form steps, and by joining multiple frame sections 34 of different heights, a frame 3 that matches the overall shape of the stairs is formed.

[0025] The runner 30 is made of wood and is fixed to the floor with screws. The runner 30 is a long, rectangular piece of wood that is formed horizontally along almost the entire length of the frame section 34. In order to form the joint of the frame section 34, the length of the runner 30 protrudes slightly above the position where the highest stud 31 of the frame section 34 is formed. The stud 31 is made of wood and is erected on top of the runner 30 by being screwed in. In this embodiment, the stud 31 has the same cross-sectional shape as the runner 30. The cross-sectional shape of the stud 31 is not limited to being the same as the runner 30; any shape that can secure the necessary strength and screw the interior wall material 7 and side plate 2 without interfering with other members is acceptable. The studs 31 are formed so that they get progressively higher along the slope of the stairs. Adjacent studs 31 are formed such that the upper stud 31 is one step higher than the lower stud 31, and adjacent studs 31 are erected at equal intervals. The spacing between adjacent studs 31 is equal to the length of one step in the depth direction of the staircase. A horizontal groove 33 is formed on the side of the stud 31 that is on the lower side of the staircase slope. The groove 33 is a rectangular groove cut horizontally into the side of the stud 31, and the height of the lower inner surface of the groove 33 is equal to the height of the upper surface of the stud 31 opposite the groove 33. One end of the upper horizontal member 32 fits snugly into the groove 33.

[0026] The upper horizontal member 32 is horizontally installed by inserting one end into a horizontal groove 33 formed in one of the adjacent studs 31, and fixing the other end to the upper surface of the other stud 31. In this embodiment, the upper horizontal member 32 has the same cross-sectional shape as the studs 31 and runners 30. The cross-sectional shape of the upper horizontal member 32 is not limited to the one described above; it can be any shape that can secure the necessary strength and be installed between two adjacent studs 31 without interfering with other members.

[0027] [Regarding the joints between frame components] As shown in Figure 10, the frame section 34 is formed by dividing the frame 3 into two or more sections, one on the upper side and one on the lower side in the direction of the stairs. Dowel holes 35 are formed on the upper surface of the end of the runner 30 of the lower frame section 34 at the joint between the frame sections 34. The dowel holes 35 are cylindrical holes, and two are formed side by side in the width direction of the stairs. On the upper surface of the runner 30 of the upper frame section 34 at the joint between the frame sections 34, a protruding portion 36 of a wooden square timber is fixed, protruding toward the lower side. The protruding portion 36 has the same cross-sectional shape as the runner 30, and a projection 37 is formed on the lower surface of the protruding portion, protruding downward so as to fit into the dowel hole 35. The projection 37 is cylindrical in shape and inserted into the dowel hole 35, and two are formed side by side in the width direction of the stairs so as to overlap the position where the dowel hole 35 is provided.

[0028] At the joint between two frame sections 34, the uppermost stud 31 of the lower frame section 34 has a groove 33 formed on its side surface into which the upper horizontal member 32 is inserted, and the upper end of the upper horizontal member 32 is not fixed. At the joint between two frame sections 34, the upper frame section 34 is provided with a support column 38 that connects the upper surface of the protruding portion 36 and the lower surface of the upper horizontal member 32. The support column 38 has the same cross-sectional shape as the stud 31 and supports the middle portion of the upper horizontal member 32.

[0029] When joining frame sections 34 together to form frame 3, the protruding portion 36 of the upper frame section 34 is moved onto the end of the runner 30 of the lower frame section 34, and the projections 37 formed on the lower surface of the protruding portion 36 are inserted into the two dowel holes 35 formed on the upper surface of the runner 30, thereby joining the frame sections 34 together. At this time, the end of the lowest upper horizontal member 32 of the upper frame section 34 is brought into contact with the upper surface of the uppermost stud 31 of the lower frame section 34. Then, the protruding portion 36 of the upper section and the runner 30 of the lower section are fixed with screws, and the upper horizontal member 32 and the stud 31 of the lower section, which are in contact with each other, are fixed with screws to form frame 3.

[0030] In this way, by making the frame 3 divisible into two or more frame sections 34 for the upper and lower steps of the staircase, the labor involved in transporting and installing the frame to the site can be reduced. Since the frame sections 34 are joined together by the fitting of dowel holes 35 and projections 37, the frame 3 can be formed easily and with high precision. Furthermore, if two or more dowel holes 35 and projections 37 are formed side by side in the width direction of the staircase, the straightness accuracy of the frame 3 can be improved, and even if the staircase is open to the sides without partition walls 8, it can be formed with high precision.

[0031] [Regarding stair construction methods] The stair construction method, for example, first involves manufacturing the frame 3 in a factory. The frame 3 is constructed by placing studs 31 on runners 30 and fixing them with screws or adhesive. Furthermore, one end of the upper horizontal member 32 is inserted into a groove 33 formed on the side of the stud 31, and the lower surface of the other end of the upper horizontal member 32 is brought into contact with the upper surface of the adjacent stud 31, and each is fixed with screws or adhesive. Note that the stair construction method for forming the stair base structure 1 of this embodiment is not limited to constructing the entire frame 3 in a factory, but may also involve manufacturing frame components 34 in a factory and joining them together after delivery to the site to form the frame 3.

[0032] At the factory, in addition to the frame 3, multiple segmented parts 22 and connecting plates 4 are also manufactured. Subsequently, the frame 3, multiple segmented parts 22, and connecting plates 4 are transported to the building construction site. Various components that make up the stairs, such as risers 6, treads 5, and interior wall materials 7, are also transported from the factory to the site.

[0033] Next, as shown in Figures 5 and 6, multiple divided parts 22 are connected by a connecting plate 4 to form a side plate 2. Specifically, two divided parts 22 are inserted between the plate body 40 of the connecting plate 4 and the short side 43 of the guide member 41. The two divided parts 22 are inserted on both sides so as to sandwich the triangular plate 42 of the connecting plate 4. At this time, the corner 28 formed by the lower end edge 26 of the upper divided part 22 and the vertical end edge 25 formed at the upper end of the lower divided part 22 abuts against the two upper sides of the triangular plate 42, and the lower edges 24 of the two divided parts 22 along the stair slope direction abut against the long side 44 of the guide member 41, thereby positioning the two divided parts 22 in the appropriate location. After that, the divided parts 22 are connected by fixing the sides of the two divided parts 22 to the plate body 40 with screws. Furthermore, the same process is repeated to connect the required number of divided parts 22 to form a side plate 2. Since the side panels 2 are to be placed on both sides in the width direction of the stairs, the above process is repeated to form two side panels 2.

[0034] Once the side panels 2 are formed, they are fixed to the building's structural frame, such as beams (not shown), and positioned along the stair slope. If the staircase being constructed is formed with one end opening towards a living space, such as a living room, and the other end closed off by a partition wall 8, then one of the two side panels 2 is positioned on one side of the staircase in the width direction, and the other side panel 2 is positioned along the partition wall 8 on the other side of the staircase in the width direction. Then, as shown in Figure 12, a frame 3 is positioned on the outside of the staircase in the width direction, adjacent to one of the side panels 2 in the width direction, and the runners 30 of this frame 3 are fixed to the floor surface with screws. The order in which the side panels 2 are fixed and the frame 3 are fixed does not matter.

[0035] Next, as shown in Figure 13, screws are driven into the plate body 40 of one side panel 2 to fix the side panel 2 to the stud 31 of the frame 3. Screws are also driven into the plate body 40 of the other side panel 2 to fix it to the partition wall 8. Note that in Figure 13, the partition wall 8 is partially omitted for illustrative purposes. Then, the riser board 6 is fixed to the rising portion 20 of the side panel 2 with screws, and the tread board 5 is fixed to the horizontal portion 21 of the side panel 2, and an interior wall material 7 such as gypsum board is attached to the side of the frame 3 opposite to the side to which the tread board 5 is fixed. After that, although not shown in the figure, wallpaper is attached to the interior wall material 7, and handrails and baseboards are installed on the stairs to complete the stairs.

[0036] Thus, according to the stair construction method of this embodiment, the frame 3 is manufactured in a factory and transported to the site, thereby improving the construction accuracy of the stair base structure 1 and facilitating on-site construction work. The side panels 2 are transported in multiple divided sections 22 and connecting plates 4, which simplifies the transport work. Furthermore, since the divided sections 22 are connected using the connecting plates 4 to form the side panels 2, the process of forming the side panels 2 is simplified and highly accurate. Therefore, by fixing the highly accurate frame 3 and side panels 2 to form the stair base structure 1, it is possible to create a highly accurate staircase while improving the constructability of the staircase.

[0037] It goes without saying that the embodiments of the present invention are not limited to those described above, and can be modified as appropriate without departing from the scope of the spirit of the present invention.

[0038] This specification discloses the following technologies:

[0039] [Note 1] The stair base structure of Appendix 1 is a stair base structure that forms a staircase, comprising a side plate arranged along the stair slope and having alternating rising sections for which risers are fixed and horizontal sections for which treads are fixed, wherein the side plate comprises a plurality of divided sections divided in the direction of the stair slope and a connecting plate that connects adjacent divided sections, the connecting plate comprising a plate body formed in the direction of the stair slope and fixed in contact with the sides of two adjacent divided sections, a guide member formed along the longitudinal direction of the plate body and in contact with the lower surfaces of two adjacent divided sections, and a triangular plate fixed in the middle of the longitudinal direction of the plate body and aligning with the guide member when adjacent divided sections are butted together, the corner formed by the lower edge of the upper divided section and the vertical edge formed at the upper end of the lower divided section.

[0040] According to the stair base structure described in Appendix 1, when connecting the divided sections of the side plate, the lower surfaces of the two sections are brought into contact with the guide member of the connecting plate, and the triangular plate is aligned with the guide member at the corner formed by the lower edge of the upper section and the vertical edge formed at the upper end of the lower section. This makes it extremely easy to position the two sections to connect, and improves the accuracy of the connection position of the two sections. Therefore, the side plates can be formed with high precision, and when the side plates are placed along the stair slope, they can be installed with precision, thus reducing the effort required for adjustment and allowing for the formation of a highly accurate stair base structure.

[0041] [Note 2] The stair substructure of Appendix 2 further includes a frame to which interior wall material is attached, which is the stair substructure of Appendix 1 and has runners fixed to the floor surface, a plurality of studs erected on the runners in order to rise along the stair slope, and upper horizontal members connecting adjacent studs, wherein the studs have horizontal grooves on the side facing the lower side of the stair slope, and the upper horizontal member is horizontally erected with one end inserted into the groove of one of the adjacent studs and the other end fixed to the upper surface of the other stud.

[0042] According to the stair substructure described in Appendix 2, the upper horizontal member is installed horizontally by inserting one end into the groove of one of the adjacent studs and fixing the other end to the upper surface of the other stud. Therefore, the upper horizontal member extending to one side is fixed to the upper surface of one stud, and the end of the upper horizontal member extending to the other side is inserted into a groove formed on the side of the stud and fixed. As a result, the ends of both upper horizontal members can be fixed with a single stud, eliminating the need to place two studs of different heights adjacent to each other. This reduces the number of studs required for the frame and lowers material costs. Furthermore, reducing the number of studs makes the frame itself lighter, facilitating on-site delivery and enabling safe and easy installation even when the frame is installed at a high location. Moreover, since both upper horizontal members are fixed with a single stud, there is no risk of the ends of the upper horizontal members separating when the frame is lifted, and the bending of the runners forming the bottom surface of the frame can be suppressed.

[0043] [Note 3] The stair base structure described in Appendix 3 is the same as the stair base structure described in Appendix 2, in which the frame can be divided into two or more frame parts on the upper and lower sides in the direction of travel of the stairs, and at the joints between the frame parts, a dowel hole is formed on the upper surface of the end of the lower runner, and a protrusion is formed on the upper surface of the upper runner that abuts against the upper surface of the lower runner, and a projection is formed on the lower surface of the protrusion that fits into the dowel hole.

[0044] According to the stair substructure described in Appendix 3, the frame can be divided into two or more frame sections for the upper and lower steps of the staircase, thus reducing the labor required for transportation and installation at the site. Furthermore, at the joints between the frame sections, dowel holes are formed on the upper surface of the end of the lower runner, and protrusions are formed on the upper surface of the upper runner that abut against the upper surface of the lower runner, with projections formed on the lower surface of these protrusions that fit into the dowel holes. This allows the frame to be formed easily and with high precision.

[0045] [Note 4] The stair base structure described in Appendix 4 is the stair base structure described in Appendix 3, in which the dowel holes and projections are formed in a plurality of arrangement in the width direction of the stairs.

[0046] According to the stair substructure described in Appendix 4, multiple dowel holes and protrusions are formed in a row in the width direction of the stairs, which improves the straightness accuracy of the frame and allows for high precision even in stair substructures that are open to the sides without partition walls.

[0047] [Note 5] The stair construction method of Appendix 5 is a stair construction method for constructing a staircase by forming the staircase base structure of Appendix 2, and includes the steps of: manufacturing the frame in a factory; transporting the frame, a plurality of the divided parts, and the connecting plates to the construction site; connecting the plurality of the divided parts with the connecting plates to form the side plates; fixing the side plates to the structural frame of the building and arranging them along the staircase slope; installing the frame adjacent to the side plates; screwing the plate body of the side plates to the studs of the frame; fixing the treads and risers to the side plates and attaching the interior wall material to the frame.

[0048] According to the stair construction method described in Appendix 5, the frame is manufactured in a factory and then transported to the site, which improves the construction accuracy of the stair substructure and simplifies on-site construction work. The side panels are transported to the construction site in multiple sections and connecting plates, which simplifies the transport work. Furthermore, the sections are connected using connecting plates to form the side panels, which simplifies the process of forming the side panels and improves the accuracy of the process. Finally, the frame and side panels, formed with high precision, are fixed to form the stair substructure, which improves the constructability of the stairs while also enabling the creation of highly precise stairs. [Industrial applicability]

[0049] The stair substructure and stair construction method according to the present invention are suitable as a substructure and construction method for stairs where one or both sides in the width direction of the stairs, such as a living room staircase, are open to the living space. [Explanation of Symbols]

[0050] 1...Stair base structure, 2...Side panel, 3...Frame, 4...Connecting plate, 5...Step board, 6...Riser board, 7...Interior wall material, 20...Rising section, 21...Horizontal section, 22...Divided section, 25...Vertical edge, 26...Bottom edge, 30...Runner, 31...Stud, 32...Upper horizontal member, 33...Groove, 34...Frame section, 35...Dowel hole, 36...Protrusion, 37...Projection, 40...Plate body, 41...Guide member, 42...Triangular plate, 43...Short side, 44...Long side

Claims

1. A stair base structure that forms a staircase, including side plates arranged along the slope of the stairs, with alternating vertical sections for fixing risers and horizontal sections for fixing treads, The aforementioned side plate is Multiple divided bodies that are divided in the direction of the aforementioned stair slope, It has a connecting plate that connects adjacent divided parts, The aforementioned connecting plate is A plate body formed in the direction of the stair slope, which is long and flat, and is fixed in contact with the sides of two adjacent divided bodies, A guide member formed along the longitudinal direction of the plate body and in contact with the lower surfaces of two adjacent divided bodies, A triangular plate is fixed to the middle of the plate body in the longitudinal direction, and when adjacent divided parts are butted together, the corner formed by the lower edge of the upper divided part and the vertical edge formed at the upper end of the lower divided part aligns with the guide member. A stair substructure that includes the following features.

2. The frame further includes a runner fixed to the floor surface, a plurality of studs erected on the runner in succession along the slope of the stairs, and an upper horizontal member connecting adjacent studs, to which the interior wall material is attached. The stud has a horizontal groove on the side facing the lower side of the stair slope, The stair base structure according to claim 1, wherein the upper horizontal member is horizontally installed by inserting one end into the groove of one of the adjacent studs and fixing the other end to the upper surface of the other stud.

3. The frame is divisible into two or more frame sections, one on the upper side and the other on the lower side in the direction of travel of the stairs. The stair base structure according to claim 2, wherein the joint between the frame sections is formed by a dowel hole on the upper surface of the end of the lower runner, a protrusion is formed on the upper surface of the upper runner that abuts against the upper surface of the lower runner, and a projection is formed on the lower surface of the protrusion that fits into the dowel hole.

4. The stair base structure according to claim 3, wherein the dowel holes and projections are formed in a plurality of arrangement in the width direction of the staircase.

5. A method for constructing stairs, comprising forming the stair base structure described in claim 2, The process of manufacturing the frame in the factory, A step of transporting the frame, the plurality of divided parts, and the connecting plate to the construction site, A step of connecting a plurality of the divided parts with the connecting plate to form the side plate, The process involves fixing the side plate to the structural frame of the building and arranging it along the slope of the stairs, The steps include installing the frame adjacent to the side plate, The process of screwing the plate body of the side plate to the studs of the frame, The process involves fixing the step boards and risers to the side boards and attaching the interior wall material to the frame, Stair construction methods, including those mentioned above.

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