JP4442475B2 - Open-type stair girder mounting structure - Google Patents

Description

  The present invention relates to an open type staircase structure attached to a building.

  Conventionally, in a so-called open type staircase where a staircase constructed in a building does not use a kick plate and the side of the staircase is open at a right angle to the vertical direction of the staircase, the girder is usually a staircase structure. One is provided on each of the left and right sides in the ascending / descending direction. Furthermore, the connection structure between each tread board and the girder is such that the tread board is inserted into the girder at the location where the girder and tread board are joined, and a notch portion is provided on both the tread board and the girder for attachment. Yes. The cut portion is processed in the same manner as in the case of a so-called box-type staircase in which the left and right side surfaces of the girder are surrounded by wall surfaces and a kick plate is used. It is calculated from the number of steps, and the kicking dimensions and tread dimensions of the stairs are calculated, and the predetermined positions of the girders are marked.

  Furthermore, inking is similarly applied to the notch portion on the tread board side. Subsequently, the girder and the tread are cut at the construction site. The cut portions thus formed are fitted to each other and attached and fixed by a fixing means such as a nail. Furthermore, the upper and lower ends of the girders were directly attached and fixed to the structural material of the building. For example, the upper end of a girder is inserted into a receiving beam on the second-floor floor, and has a hanging structure, and is fixed with a battledore bolt. It had a drop-down structure and was fixed with a battledore bolt. (For example, refer nonpatent literature 1).

Architectural Materials Research Company, Design Structure Division, Artificial Encyclopedia of Art, Volume 8, “Practical Woodwork 2, Artificial Works”, Architectural Materials Research Co., Ltd., September 10, 1991, p. 172-175.

  However, in the conventional girder mounting structure described above, it is necessary to insert the upper and lower ends of the girder and cut them for machining, and further to the structural frame such as the receiving beam of the building or the overdrawing. The structural material requires the same incision processing, and has been complicated and labor-intensive, such as mounting and fixing with construction hardware such as a battledore bolt. In addition to the problems of construction work, it is necessary to have advanced skills of craftsmen who are proficient in woodworking, and in recent years, craftsmen with such advanced skills are becoming fewer.

  Further, in the conventional girder mounting structure, it is an important condition that the floor board finishing material and the wall finishing material are not applied at the time of installing the girder. Otherwise, attaching the girder directly to the structural frame of the building would be an extremely difficult task. It was necessary to remove the floor covering material and wall finishing material once, and after installing the girder, it was necessary to apply the floor finishing material and wall finishing material again. For example, when reforming an open staircase, dismantle the floor finishing material and wall finishing material, expose the structural frame, attach and fix the girders, and finally install the floor finishing material and wall finishing material. It was. For this reason, the conventional girder mounting structure has a problem that the construction cost is high.

  The object of the present invention is that it does not require the skill of skilled craftsmen in the installation work of the open-type stair girder, and it is not necessary to dismantle the floor finishing material or wall finishing material at the time of reform. It is an object of the present invention to provide an open stair girder mounting structure that is extremely simple to construct, inexpensive to construct, and excellent in mounting accuracy and strength and durability.

  In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention comprises a plurality of treads and a girder (2) in which the plurality of treads are attached at predetermined intervals. In the open-type stair mounting structure (1) in which both ends are fixed and fixed using the vertical fixing means (3), the vertical fixing means (3) is the mounting base plate (B). And a holding plate (H) provided on the mounting base plate (B). The mounting base plate (B) includes a base plate bottom surface portion (B1) and the base plate. The holding plate (H) includes an outer holding portion (K1) erected in a substantially vertical direction from the left and right side edges of the bottom surface portion (B1), and the holding plate (H) is wider than the mounting base plate (B). It has a narrow width corresponding to the thickness corresponding to the thickness of the beam (2), and the holding plate bottom surface portion (H1) and the holding plate bottom surface portion (H1) on both the left and right sides An inner clamping portion (K2) is erected in a substantially vertical direction from the edge, and the vertical fixing means (3) is attached and fixed at predetermined positions on the wall surface (W) and the floor surface (F), and the vertical fixing means (3 The upper and lower ends of the beam (2) are clamped and fixed by the outer clamping part (K1) of the mounting base plate (B) and the inner clamping part (K2) of the holding plate (H). It is characterized by becoming.

  According to the present invention having such a configuration, in the installation work of the girder of the open type staircase, as in the past, the upper and lower ends of the girder and the receiving beam of the building and the large drawing, In addition to eliminating the complicated and time-consuming method of cutting and cutting, and fixing and fixing with construction hardware such as a battledore bolt, there is no need for solving the problem that it takes time and labor, as well as woodworking. The skill of skilled craftsmen is not necessarily required.

  In addition, it is not necessary to dismantle the floor finish or wall finish during the renovation. Therefore, the installation is extremely simple, the construction cost is low, and the installation accuracy and strength durability are excellent. -Punch-type stair girder mounting structure is possible.

  The invention according to claim 2 of the present invention is the open-type stair girder mounting structure according to claim 1, wherein an outer clamping portion (B) of the mounting base plate (B) of the vertical fixing means (3) is provided. K1) and a notch step portion (S) is provided in the standing height direction of the inner clamping portion (K2) of the holding plate (H), and the outer clamping portion (K1) is the notch step portion (S). Are divided into an outer holding plate (KT1) having a high standing height and an outer support plate (KS1) having a low standing height, and the inner holding portion (K2) is formed by the notch step (S). Are divided into an inner holding plate (KT2) having a high standing height and an inner support plate (KS2) having a low standing height, and the upper and lower ends of the beam (2) are connected to the outer holding plate ( KT1) and the inner clamping plate (KT2) are clamped and fixed, and are supported by the outer support plate (KS1) and the inner support plate (KS2). It is characterized in that there.

  According to the present invention having such a configuration, the outer sandwiching portion (K1) and the inner sandwiching portion (K2) are separated by the notch step portion (S), and the outer sandwiching plate (KT1) having a high standing height and the inner sandwiching portion. Since it is divided into a plate (KT2), an outer support plate (KS1) and an inner support plate (KS2) having a low standing height, after installing the girder (2), the upper and lower ends of the girder (2) In the above, the outer sandwiching portion (K1) and the inner sandwiching portion are acted by the outer support plate (KS1) and the inner support plate (KS2) in which a part of the vertical fixing means (3) is cut out to reduce the standing height. (K2) does not protrude from the front and back surfaces of the girders, and is excellent in appearance, and can be prevented from being injured at the protruding portion.

  According to a third aspect of the present invention, in the open type step girder mounting structure according to the first or second aspect, the base plate bottom surface portion (B1) and the holding portion of the vertical fixing means (3) are provided. Mounting holes (T) to the wall surface (W) and the floor surface (F) are provided at predetermined positions on the plate bottom surface portion (H1), and girders are provided at predetermined positions on the outer clamping plate (KT1) and the inner clamping plate (KT2). (2) A girder fixing hole (P) for mounting is provided, and through holes (R) are provided at predetermined positions on both upper and lower ends of the girder (2). Using the through holes (R) The mounting bolt (M) and nut (N) are used to mount and fix the girder (2), and the mounting holes (T) are used to attach the vertical fixing means (3) to the wall surface (W) and the floor surface (F). It is characterized by mounting and fixing.

  According to the present invention having such a configuration, the fixing of the vertical fixing means (3) to the wall surface (W) and the floor surface (F) and the fixing of the girder (2) to the vertical fixing means (3) are extremely possible. It is simple and has excellent strength and durability for mounting.

  According to a fourth aspect of the present invention, in the open stair girder mounting structure according to any one of the first to third aspects, the mounting holes provided in the bottom surface portion (H1) of the holding plate are vertically It is a long hole (TL) long in the width direction of the fixing means (3).

  According to the present invention having such a configuration, even if the beam (2) is slightly warped, deformed, or twisted, the mounting hole provided in the bottom surface portion (H1) of the holding plate is a long hole (TL). Therefore, the holding plate (H) can be adjusted and moved in the left-right width direction. Therefore, the girder (2) when the girder (2) is clamped by the outer clamping part (K1) and the inner clamping part (K2). The space for inserting the girder is very flexible on the left and right, and the installation work of the girder (2) is remarkably improved.

  According to the present invention, in the attachment structure of a girder in an open-type staircase, the upper and lower ends of the girder are fixed and fixed using the vertical fixing means, and the vertical fixing means includes the mounting base plate and the mounting base. -A holding plate provided on the base plate, wherein the mounting base plate is a base plate bottom surface portion and an outer holding portion erected in a substantially vertical direction from the left and right side edges of the base plate bottom surface portion The holding plate has a width that is narrower than the mounting base plate by a dimension corresponding to the thickness of the girder, and has a bottom surface of the holding plate and both left and right edges of the bottom surface of the holding plate. An inner clamping portion is erected in a substantially vertical direction, and the vertical fixing means is fixedly mounted at predetermined positions on the wall surface and the floor surface. The outer clamping portion of the mounting base plate of the vertical fixing means and the inner clamping portion of the holding plate The upper and lower ends of the beam are clamped and fixed.

  Therefore, in the installation work of the girder of the open type staircase, as in the past, the upper and lower ends of the girder and the receiving beam of the building and the overdraw are subjected to large insertion processing and cutting processing for the dosing processing, In addition, it eliminates the need for complicated and time-consuming construction methods such as mounting and fixing with construction hardware such as winged board bolts. No longer need it. In addition, it is not necessary to dismantle the floor finish or wall finish during the renovation. Therefore, the installation is extremely simple, the construction cost is low, and the installation accuracy and strength durability are excellent. -Punch-type stair girder mounting structure is possible.

  In addition, a notch step portion is provided in the standing height direction of the outer holding portion of the mounting base plate of the vertical fixing means and the inner holding portion of the holding plate, and the outer holding portion is formed by the notch step portion. The inner holding plate is divided into an outer holding plate having a high standing height and an outer supporting plate having a low standing height, and the inner holding portion is separated from the inner holding plate having a high standing height and the standing height by a notch step portion. The upper and lower ends of the girders are sandwiched and fixed by the outer sandwich plate and the inner sandwich plate, and are supported by the outer support plate and the inner support plate. The inner clamping part is divided into a high standing height outer clamping plate, an inner clamping plate, a lower standing height outer support plate, and an inner support plate by a notch step, and after installing the girder, Outer support plate with a lower standing height by notching part of the vertical fixing means at the upper and lower ends of the girder The action of the inner support plate, the outer clamping part, prevents such inner clamping part protrudes from the digits front and back surfaces, excellent in appearance appearance of, moreover, it is possible to prevent such injury by the protrusion.

  In addition, mounting holes to the wall surface and the floor surface are provided at predetermined positions on the bottom surface of the base plate and the bottom surface of the holding plate of the upper and lower fixing means for attaching a girder at predetermined positions on the outer and inner clamping plates. A girder fixing hole is provided, and through holes are provided at predetermined positions on both upper and lower ends of the girder, and the girder is mounted and fixed using mounting bolts and nuts using the through holes, and the mounting holes are used. Since the vertical fixing means is attached and fixed to the wall surface and floor surface, it is very easy to attach and fix the vertical fixing means to the wall surface and floor surface, and to fix the girder to the vertical fixing means. It will be excellent.

  In addition, since the mounting hole provided in the bottom surface of the holding plate is a long hole extending in the width direction of the vertical fixing means, it is provided in the bottom surface of the holding plate even if the beam is slightly warped, deformed or twisted. The holding plate can be adjusted and moved in the left-right width direction by the function of the long holes in the mounting holes.Therefore, the space for inserting the girder when clamping the girder between the outer clamping part and the inner clamping part is slightly left and right. Flexibility and remarkably improved girder installation workability.

  An example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of an open-type stair girder mounting structure of the present invention, FIG. 2 is a perspective view showing an embodiment of the vertical fixing means of the present invention, and FIG. FIG. 4 is a plan view, a front view, a side view and FIG. 5 is a vertical fixing means of the present invention. FIG.

  A description will be given with reference to FIGS. In the installation of the girder 2 of the open-type stair girder 1, as an example, in the case of a wooden framed construction method, the vertical fixing means 3 of the girder of the present invention is attached to the floor F and the wall W. By using mechanical means such as wood screws G using the mounting holes T provided in the plate B, the structural frame of the floor surface F, the joist (not shown) and the wall surface W of the structural frame It is fixed to a certain pillar, a middle pillar, a trunk difference, a trunk edge (not shown), and the like. Even if the housing structure is a frame wall method other than a wooden frame, a wooden panel method, etc., it may be attached to each structural frame in the same manner. Of course, you may nail it with a nail.

  The upper and lower ends of the girder 2 are cut obliquely according to the mounting inclination angle of the girder 2 and are provided so as to contact the mounting base plate B of the vertical fixing means 3 mounted on the wall surface W and the floor surface F. It has been.

  The vertical fixing means 3 includes an attachment base plate B and a holding plate H provided on the attachment base plate B. The mounting base plate B is erected in a substantially vertical direction from a base plate bottom surface portion B1 constituting the substrate of the vertical fixing means 3 and from both side edges in the left-right width direction of the base plate bottom surface portion B1. It is comprised from the outer side clamping part K1 made. The above-mentioned standing portions are not provided on both side edges in the longitudinal direction of the base plate bottom surface portion B1.

  The holding plate H has a width that is narrower than the mounting base plate B by a dimension corresponding to the thickness of the beam 2 in the width direction. The holding plate H includes a holding plate bottom surface portion H1 constituting the substrate, and an inner holding portion K2 erected in a substantially vertical direction from both side edges in the left-right width direction of the holding plate bottom surface portion H1. The vertical fixing means 3 is mounted and fixed at predetermined positions on the wall surface W and the floor surface F by using mechanical means such as wood screws G and nails using the mounting holes T provided in the vertical fixing means 3.

  The girder 2 and the vertical fixing means 3 are attached to both the upper and lower ends of the girder 2 at the outer clamping part K1 of the mounting base plate B of the vertical fixing means 3 and the inner clamping part K2 of the holding plate H. Is clamped and fixed.

  The upper and lower ends of the girder 2 are clamped between the outer clamping part K1 and the inner clamping part K2 of the vertical fixing means 3, for example, a combination of a bolt M and a nut N using a girder fixing hole P, or a tree It is attached using mechanical means such as a screw G. You may nail it using a nail. In this example, the vertical fixing means 3 is composed of an attachment base plate B and a holding plate H provided on the attachment base plate B, and is formed at both side edges in the width direction of the attachment base plate B and the holding plate H. The upper and lower ends of the girder 2 are inserted and held in a space surrounded by the outer clamping part K1 and the inner clamping part K2, and a bolt is fixed using the girder fixing hole P provided in the girder 2 It is mounted and fixed by a combination of M and nut N, or mechanical means such as wood screws G and nails.

  Further, in this example, the dimension of the girder 2 is a cross-sectional angle of about 50 to 200 mm in terms of the thickness of the finding surface (wood end surface) when the girder 2 is viewed from the front and about 200 to 300 mm in the depth dimension viewed from the front. The length of the mold is about 1m to 5m, and the girder 2 has a thick girder 2 installed at the approximate center of the place where the staircase is planned to be installed, or two slightly thinner girder 2 are prepared. As described above, it may be used near the center instead of being installed at the left and right ends of the staircase width.

  In this case, the interval between the two beams 2 is preferably about 50 to 150 mm. However, it is not limited to this dimension. It is determined as appropriate depending on the height of the floor, the horizontal dimension, the material of the girder, the finish of the open staircase structure, the design, and the like. Further, in this example, two girders 2 are prepared and attached with a slight separation (about 50 mm to 150 mm). In this case, two combinations of the outer clamping part K1 and the inner clamping part K2 are required.

  The material of the girder 2 is made of laminated wood, LVL, plywood core with veneer, decorative resin sheet, decorative paper, etc. -Metals such as those to which paste is applied can be used. However, it is not limited to these.

  In particular, FIG. 2 shows a perspective view of an embodiment of the vertical fixing means 3 of the present invention. Moreover, in FIG. 3, the top view, a front view, and a side view are shown.

  2 and 3, details of the vertical fixing means 3 for attaching and installing the girder 2 of the present invention will be described below. That is, the vertical fixing means 3 of the present invention is composed of two members, an attachment base plate B and a holding plate H provided on the attachment base plate B. Further, the mounting base plate B includes a base plate bottom surface portion B1 and two outer sandwiched erected in a substantially vertical direction from both side edges in the left-right width direction of the base plate bottom surface portion B1. It consists of part K1.

  The holding plate H has a width that is narrower than the mounting base plate B by a size corresponding to the thickness of the beam 2 in the width direction. The holding plate bottom surface portion H1 and the holding plate bottom surface It is comprised by the inner side clamping part K2 erected in the substantially perpendicular direction from the both-sides edge of the left-right width direction of the part H1. In this way, the holding plate H is placed on the mounting base plate B while being in contact with the mounting base plate B, and a plurality of mounting holes T provided in the respective bottom surface portions overlap each other. A mechanism in which the two bottom surface portions are mounted and fixed simultaneously by mechanical means such as wood screws G and nails toward the structural frame of the wall surface W or the floor surface F using the mounting holes T; It has become.

  In addition, the outer clamping portion K1 of the mounting base plate B and the inner clamping portion K2 of the holding plate H provided in the vertical fixing means 3 that are fixedly mounted at predetermined positions on the wall surface W and the floor surface F, The upper and lower ends of the girder 2 are sandwiched and attached and fixed.

  Further, a notch step portion S is provided in the height direction of the outer clamping portion K1 of the mounting base plate B of the vertical fixing means 3 and the inner clamping portion K2 of the holding plate H. Depending on the mounting inclination angle of the girder 2, the notch step S may be provided to prevent a part of the vertical fixing means 3 from protruding from the end of the girder 2 after the girder 2 is mounted. It has been.

  The outer clamping portion K1 is divided by the notch step portion S into an outer clamping plate KT1 having a high standing height and an outer support plate KS1 having a low standing height, and the inner clamping portion K2 is divided into the notch step portion K2. The portion S is divided into an inner holding plate KT2 having a high standing height and an inner support plate KS2 having a low standing height, and the upper and lower ends of the beam 2 are separated from the outer holding plate KT1 and the inner holding plate KT2. And is supported by the outer support plate KS1 and the inner support plate KS2. As described above, a part of the vertical fixing means 3 protrudes from the end of the beam 2 by lowering the standing height of the outer support plate KS1 and the inner support plate KS2 having a low standing height. It will be resolved.

  The notch size of the notch step S is preferably about half or more of the longitudinal direction of the vertical fixing means 3. About 50% to 70% is the optimum dimension to eliminate the point that a part of the vertical fixing means 3 protrudes from the end of the beam 2. The notch depth of the notch step S is preferably about half or more of the height dimension of the standing portion. About 50% to 90% is the optimum notch depth.

  Further, the size of the mounting base plate B of the vertical fixing means 3 is approximately 200 to 300 mm in the width dimension (frontage dimension) in the installed state, and approximately 300 to 450 mm in the longitudinal direction (dimension in the depth direction). Thus, a thickness of about 2.0 to 5.0 mm is suitable. In addition, the standing height dimension of the outer clamping part K1 and the inner clamping part K2 is about 30 to 60 mm in the higher height dimension without being cut out, and the depth of the notch step part is 30 mm in height. About 15 mm to 27 mm. In the case of a height of 60 mm, approximately 30 mm to 54 mm is suitable. Accordingly, the height of the outer clamping plate KT1 and the inner clamping plate KT2 is preferably about 30 to 60 mm, and the height of the outer support plate KS1 and the inner support plate KS2 is preferably about 3 to 30 mm.

  Further, in this example, the mounting holes T are provided at a total of nine locations including the four corners of the base plate bottom surface portion B1 of the mounting base plate B, the approximate center in the longitudinal direction, one front side, and two back sides. . Further, attachment holes T are provided in a total of three locations, one in front of the holding plate bottom surface portion H1 of the holding plate H and two in the back side. The three attachment holes T in total, one in front of the holding plate bottom surface portion H1 and two in the back side of the holding plate H, are located immediately below the base plate bottom surface portion B1 at one front side and the back side 2. The positions coincide with the three mounting holes T in total. When attaching the vertical fixing means 3 to the wall surface W and the floor surface F, the attachment base plate B and the holding plate H are simultaneously attached to each other simultaneously with wood screws G, nails, etc. attached to the attachment holes T in the three places. Fix it.

  Further, the two outer clamping plates KT1 and the two inner clamping plates KT2 are provided with a total of eight girder fixing holes P for girder mounting at two locations per one clamping plate.

  Moreover, the material of the up-and-down fixing means 3 for fixing the girder 2 is suitably made of metal such as stainless steel, aluminum, galvanized steel plate, brass-plated steel plate, or casting. However, it is not limited to these.

  FIG. 4 shows a plan view, a front view, and a side view of another embodiment of the vertical fixing means of the present invention. In this example, the mounting holes T provided in the holding plate bottom surface portion H1 of the holding plate H are elongated holes TL that are elongated in the width direction, and are provided in a total of two locations, one on the front side and one on the back side. It is sufficient that the longer dimension of the long hole TL is about 10 mm to 20 mm.

  A plurality of mounting holes T are provided in the base plate bottom surface portion B1 of the mounting base plate B. In this example, mounting holes T are provided at a total of eight locations, one at the front side and one at the back side, at the four corners of the base plate bottom surface portion B1 of the mounting base plate B, the approximate center in the longitudinal direction, and the approximate center in the width direction. Is provided. Of these, the centers of the two mounting holes T, one at the front side and one at the back side, at the approximate center in the width direction of the base plate bottom surface portion B1 substantially coincide with the center of the long hole TL.

  The vertical fixing means 3 is attached to the wall surface W and the floor surface F using wood screws G in the long hole TL, and the girder 2 is inserted into the girder mounting space surrounded by the outer clamping plate KT1 and the inner clamping plate KT2. When it is attempted to be attached, if there is a case where the girder 2 is warped and cannot be inserted, the wood screw G of the long hole TL is loosened, and the holding plate H is slightly adjusted while moving in the width direction. If this is done, it can be inserted even if there is some warping. After the fine adjustment is completed, the wood screw G may be firmly tightened and fixed.

  At this time, the width of the girder mounting space is slightly larger than the thickness of the girder 2 so that the other girder mounting space does not wrinkle and this time cannot be inserted. It is good to have a clear space. The clearance dimension is preferably about 0.5 mm to 2.0 mm for workability.

  In addition, when the beam 2 is not warped at all, the thickness of the beam 2 is about 0.5 mm to 2.0 mm smaller than the width of the beam mounting space. A gap of about 1.0 mm is generated. In this case, a spacer may be prepared at a construction site using a piece of wood having a thickness of about 1 mm to fill the gap.

  In FIG. 5, the detail of the girder attachment structure at the time of using the vertical fixing means 3 of this invention is shown. In this example, the vertical fixing means 3 is viewed from the front in the width direction. Shown from the back side of the girder mounting construction as viewed from the front, the base plate bottom surface B1 of the mounting base plate B and the two outsides with a high standing height standing on both sides thereof The clamping plate KT1 is visible. The holding plate H is housed in the inside, and two inner holding plates KT2 standing upright on both sides of the holding plate bottom surface portion H1 can be seen, and the outer holding portion K1 and the inner holding plate can be seen. There are two girder mounting spaces surrounded by the portion K2.

  The lower end of the girder 2 is cut obliquely so that the cut surface is parallel to the floor surface F according to the inclination angle of the girder. The same applies to the upper end of the beam 2. In this example, the lower end portion of the girder 2 is surrounded by the outer clamping portion K1 and the inner clamping portion K2 of the vertical fixing means 3, and the diagonal cutting portion of the girder 2 is inserted into the girder mounting space, and the outer clamping plate KT1 and inner side A through hole is machined in the girder 2 at the construction site in alignment with the position of the girder fixing hole P provided in the clamping plate KT2.

  Further, the mounting screw M is inserted from the outside of the girder 2, and is fixed by tightening with a nut N to a protruding portion of the mounting screw that protrudes inside the girder 2. Using a cap nut will further improve the construction finish. At this time, if the head of the mounting screw M is dished, and the outer clamping plate is similarly dished, the head of the mounting screw M does not protrude from the outer surface, so that the construction finish is improved. . At this time, sufficient care must be taken so that the outer clamping portion K1 and the inner clamping portion K2 do not protrude from the beam 5. In particular, pay attention to the protrusion of the outer support plate KS1 and the inner support plate KS2.

  Although not in this example, it is also possible to perform construction using a thicker girder 2 in the center. In that case, a holding plate H having an internal dimension in the width direction corresponding to the thickness of the girder 2 is sufficient. The mounting base plate B may be provided, but the mounting work can be performed without it. The holding plate H is attached to the floor surface F and the wall surface W using the mounting holes T of the holding plate H. The leading end of the beam 2 is inserted into the space surrounded by the holding plate bottom surface portion H1 of the holding plate H and the two inner clamping portions K2 provided upright on both sides thereof, and similarly, the inner clamping plate KT2 is inserted into the inner clamping plate KT2. A through hole is processed in the girder 2 at the construction site in alignment with the position of the provided girder fixing hole P. Further, the mounting screw M is fastened with a nut N to a protruding portion of the mounting screw protruding from the outside of the beam 2 to the opposite side of the insertion beam 2 and fixed. Using a cap nut will further improve the construction finish.

The construction procedure of the girder mounting structure of the present invention is as follows.
1. Measure floor height, horizontal dimension, number of climbing steps, kick-up dimensions, tread dimensions, etc. at the stairs construction site.
2. Decide whether to install thicker girders with one or thin girders with two, and prepare two upper and lower fixing means of appropriate size and shape. When constructing with one girder, it is only necessary to prepare two holding plates of a size and shape corresponding to the girder. In the case of this example (FIG. 1), two girders with a thickness of about 65 mm were prepared. Also, the internal dimension between the girders was set as 100 mm. Moreover, as a vertical fixing means, a galvanized steel sheet having a thickness of 2.3 mm was used. In this example, the opening size of the mounting base plate was 235 mm and the depth size was 380 mm. The standing height of the outer and inner clamping plates was 52 mm, the depth dimension of the notch step portion was 230 mm, and the depth was 40 mm. The inner dimension of the outer sandwich plate and the inner sandwich plate was 66 mm.
3. The upper and lower ends of the girders are diagonally cut from the floor height dimensions, horizontal dimensions, number of climbing steps, kick-up dimensions, tread dimensions, etc.
4). Temporarily place the cut girder on the staircase installation location and mark the mounting position on the wall and floor to which the vertical fixing means is attached. At this time, it is confirmed that there is a wall structure and a floor structure at the position of the wood screw.
5). The upper and lower fixing means are fixed to predetermined positions on the wall surface and the floor surface using wood screws.
6). The upper and lower ends of the girder are inserted between the outer and inner clamping parts of the upper and lower fixing means, and the through holes are processed in the girder while being aligned with the girder fixing holes.
7). Using the through hole and the girder fixing hole, it is fixed with a mounting screw and a nut. This completes the girder fixing.
8). Finally, a predetermined number of treads are attached and fixed at predetermined positions of the beam using an appropriate fixing method.
The construction of the open stair girder mounting structure of the present invention is completed by the above procedure.

The perspective view which shows one Embodiment of the girder attachment structure of the open type staircase of this invention. The perspective view which shows one Embodiment of the vertical fixing means of this invention. The top view, front view, and side view which show one Embodiment of the vertical fixing means of this invention. The top view, front view, and side view which show other embodiment of the vertical fixing means of this invention. Detailed explanatory drawing of girder installation using the vertical fixing means of the present invention.

Explanation of symbols

1 Girder mounting structure 2 Girder 3 Vertical fixing means B Mounting base plate B1 Base plate bottom surface K1 Outer clamping portion KT1 Outer clamping plate KS1 Outer support plate H Holding plate H1 Holding plate bottom portion K2 Inner clamping portion KT2 Inner clamping Plate KS2 Inner support plate T Mounting hole TL Long hole P Girder fixing hole S Notch step M Mounting screw N Nut G Wood screw W Wall surface F Floor surface

Claims (4)

Opening comprising a plurality of treads and a girder (2) with a plurality of treads attached at predetermined intervals, and the upper and lower ends of the girder (2) being attached and fixed using a vertical fixing means (3) In the girder mounting structure (1) in the staircase of the mold, the vertical fixing means (3) includes an attachment base plate (B) and a holding plate (H) provided on the attachment base plate (B). The mounting base plate (B) includes a base plate bottom surface portion (B1) and an outer side erected in a substantially vertical direction from both left and right edges of the base plate bottom surface portion (B1). The holding plate (H) has a width that is narrower than the mounting base plate (B) by a dimension corresponding to the thickness of the beam (2), The holding plate bottom surface portion (H1) and the holding plate bottom surface portion (H1) have inner holding portions (K2) standing upright from both left and right edges, The fixing means (3) is attached and fixed at predetermined positions on the wall surface (W) and the floor surface (F), and the outer clamping part (K1) of the mounting base plate (B) of the vertical fixing means (3) and the holding An open stair girder mounting structure characterized in that the upper and lower ends of the girder (2) are clamped and fixed by the inner clamping part (K2) of the plate (H). A notch step portion (S) is provided in the height direction of the outer clamping portion (K1) of the mounting base plate (B) of the vertical fixing means (3) and the inner clamping portion (K2) of the holding plate (H). The outer sandwiching portion (K1) is formed into an outer sandwiching plate (KT1) having a high standing height and an outer support plate (KS1) having a low standing height by the notch step (S). The inner clamping portion (K2) is divided into an inner clamping plate (KT2) having a high standing height and an inner support plate (KS2) having a low standing height by the notch step (S). The upper and lower ends of the beam (2) are clamped and fixed by the outer clamping plate (KT1) and the inner clamping plate (KT2), and the outer support plate (KS1) and the inner support plate (KS2). The open type stair girder mounting structure according to claim 1, wherein the structure is supported by Mounting holes (T) to the wall surface (W) and the floor surface (F) are provided at predetermined positions of the base plate bottom surface portion (B1) and the holding plate bottom surface portion (H1) of the vertical fixing means (3), A girder fixing hole (P) for attaching the girder (2) is provided at a predetermined position of the outer clamping plate (KT1) and the inner clamping plate (KT2), and through holes are provided at predetermined positions at both upper and lower ends of the girder (2). (R) is provided, and the girder (2) is mounted and fixed using the mounting bolt (M) and nut (N) using the through hole (R), and the mounting hole (T) is used. 3. The open type stair girder mounting structure according to claim 1 or 2, wherein the vertical fixing means (3) is mounted and fixed to the wall surface (W) and the floor surface (F). The male hole according to any one of claims 1 to 3, wherein the mounting hole provided on the bottom surface portion (H1) of the holding plate is a long hole (TL) that is long in the width direction of the vertical fixing means (3). -Pun-type stair girder mounting structure.

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