JP5965930B2 - Corrugated board mounting structure - Google Patents

Description

  The present invention relates to a corrugated board mounting structure, and more particularly to a corrugated board mounting structure in which an open staircase is formed by attaching a plurality of wooden corrugated boards supported by a pair of wooden sasara girders.

  The sasara girder is a girder member that supports the step plate of the stairs from below, and is attached to both sides of the stairs by extending obliquely along the gradient of the stairs. In the sasara girders, for example, a plurality of stepped step portions are formed on the upper edge portion extending obliquely, and by supporting the both side portions to each step portion and attaching the step plates of each step, Stairs are formed (see, for example, Patent Document 1).

  Sasara girders, in particular in wooden staircases, are typically attached to the side walls on both sides of the staircase, so that after the staircase is formed, it is generally covered by a step board or a kick board, In recent years, various wooden staircases, which are called open staircases and have excellent design properties formed in a state where a sasara girder can be seen, have been formed (see, for example, Patent Document 2 and Patent Document 3). .

Japanese Patent Laid-Open No. 11-303216 JP 2005-139694 A JP 2007-32091 A JP-A-8-209879 Japanese Patent Laid-Open No. 11-81598

  On the other hand, when forming an open staircase by attaching a plurality of wooden step boards supported by a pair of wooden sasara girders, in the conventional technique, when fixing the step board to the horizontal step part of the sasara girders, A dowel hole is formed on the upper surface of the corrugated board, and the corrugated board is fixed by driving a fixing member such as a fixing screw toward the horizontal step portion of the sasara girder inside the dowel hole. In general, buried dowels are difficult to embed evenly and evenly on the surface of the corrugated board, and are troublesome work. The cross section of wood will appear on the surface of the corrugated board, and the design of the corrugated board will be impaired.

  On the other hand, by using a metal fitting for mounting the corrugated plate, the corrugated plate is fixed to the horizontal step portion of the sasara girder without forming a dowel hole on the upper surface of the corrugated plate or using a buried dowel material. Although methods and structures have been developed (see, for example, Patent Document 4 and Patent Document 5), the metal fittings for mounting the step plates described in these Patent Documents must be formed so as to have a complicated three-dimensional shape. In addition, it is used for the part covered by the kick board, so when used on a wooden open staircase without the kick board, the metal fittings for mounting the corrugated board can be seen from the front view. As a result, the design as a wooden open staircase is impaired.

  According to the present invention, the step board can be easily and stably fixed to the sasara girder with a simple configuration without forming a dowel hole on the upper surface of the step board or using a buried dowel material. It is an object of the present invention to provide a step plate mounting structure capable of forming a wooden open staircase excellent in design, and a flat plate for fixing a step plate used in the step plate mounting structure.

  The present invention is a step board mounting structure for forming an open staircase by supporting a plurality of wooden step boards supported by a pair of wooden sasara girders, wherein the horizontal steps of each step of the pair of sasara girders The flat plate for fixing the plate, which is attached to each end of the plate, and a depth similar to the thickness of the flat plate for fixing the plate made by cutting the lower surface of the plate. The flat plate for fixing the step plate is provided continuously between the girder fixing portions at both end portions arranged to overlap the upper surface of the horizontal step portion, and these girder fixing portions. The girder fixing portion includes a projecting portion projecting from the step plate fixing portion and abutting protrusions to the kicking step portions of the pair of sasara girders, and the girder fixing portion. Has a girder fixing hole and a step plate fixing hole in the step plate fixing portion. The plate accommodating digging portion is formed to have a planar shape in which the entire flat plate for fixing the step plate is accommodated. The fixing member is driven into the girder fixing hole from above the step plate fixing flat plate in a state where the girder fixing portion of the portion is overlapped with the abutting convex portion being in contact with the kicking step portion. The step plate fixing flat plate is fixed to the pair of sasara girders, and the step plate fixing flat plate is accommodated in the plate accommodation digging portion, and the step plate is overlapped with the step plate fixing flat plate. In this state, by driving a fixing member from below the step plate fixing flat plate into the step plate fixing hole, the step plate is inserted into the step plate fixing flat plate through the step plate fixing plate. Each is fixed to the horizontal step By providing a stepped plate mounting structure is obtained by achieving the above object.

  Further, in the corrugated plate mounting structure of the present invention, the plate accommodating digging portion formed on the lower surface side of the corrugated plate has the pair of abutting convex portions at both ends in the flat plate for fixing the corrugated plate and the It is preferably formed in a state in which a portion corresponding to the rear edge concave portion, which is surrounded on three sides by the step plate fixing portion, is left.

  Furthermore, in the step plate mounting structure of the present invention, the pair of contact projections at both end portions of the step plate fixing flat plate is provided with a distance similar to the design interval of the pair of sasara girders. Therefore, it is preferable to function as a guide for positioning the pair of sasaras girders.

  Further, the present invention is a step plate fixing flat plate used in the above step plate mounting structure, and a girder fixing portion at both end portions arranged to be overlapped on the upper surface of the horizontal step portion of each step of a pair of Sasara girders, A step plate fixing portion provided continuously between these girder fixing portions, and the girder fixing portion projects from the step plate fixing portion to the kicking step portion of the pair of sasara girders. By providing a flat plate for fixing a step plate, provided with an abutment convex portion, a girder fixing hole in the girder fixing portion, and a step plate fixing hole in the step plate fixing portion, respectively. The above objective has been achieved.

  In the flat plate for fixing the step plate according to the present invention, the pair of abutting convex portions provided at the girder fixing portions at both end portions are provided so as to maintain the same interval as the design interval of the pair of sasara girders. Therefore, it is preferable to function as a guide when positioning the pair of sasagar girders.

  According to the corrugated plate mounting structure of the present invention or the corrugated plate fixing flat plate used in the corrugated plate mounting structure, a dowel hole is not formed on the upper surface of the corrugated plate or a buried wood dowel material is used, so that it is simple. According to the configuration, the step plate can be fixed to the sasara beam easily and in a stable state, and a wooden open staircase excellent in design can be formed.

It is a perspective view of the open staircase formed using the corrugated board attachment structure which concerns on preferable one Embodiment of this invention. It is a side view of the open staircase formed using the corrugated board attachment structure which concerns on preferable one Embodiment of this invention. It is a disassembled perspective view explaining the corrugated board attachment structure which concerns on preferable one Embodiment of this invention. It is the perspective view seen from diagonally downward explaining the corrugated board attachment structure which concerns on preferable one Embodiment of this invention. It is a top view of the flat plate for corrugated board fixation. (A) is a top view of a corrugated board, (b) is a bottom view, (c) is a rear view of (a) viewed from the A direction. It is a disassembled perspective view explaining the joining structure for joining the upper end part of a sasara girder to a joining wall surface. It is the perspective view which looked at the upper end part of the sasara girder in which the positioning notch part was formed from diagonally inner back.

  The corrugated board mounting structure 10 (refer FIG. 3) which concerns on preferable one Embodiment of this invention is the middle from the floor 21 of the first floor (lower floor), for example in a wooden house building, as shown in FIGS. 1-3. When the wooden stairs for ascending and descending to the second floor (middle upper floor) floor 22 is provided as an open staircase 20, the bump that forms a step surface between the floor 21 on the first floor and the floor 22 on the second floor The upper end portion of the wall surface is used as a bonding wall surface 23, and a plurality of corrugated plates 12 are supported by a pair of Sasara girders 11 installed obliquely between the bonding wall surface 23 and the floor portion 21 on the first floor. It is adopted as a structure for attaching each. The step plate mounting structure 10 (see FIG. 3) of the present embodiment is a simple flat plate fixing plate plate 50 (see FIG. 3) that is easily covered with the step plate 12, and preferably made of metal. By using it, the plurality of step plates 12 can be fixed to each horizontal step portion 11c of the sasara girder 11 easily and stably without impairing the excellent design as the wooden open staircase 20. It has a function.

  And the corrugated board attachment structure 10 of this embodiment forms the open stairway 20 (refer FIG. 1, FIG. 2) by attaching the some wooden corrugated board 12 to a pair of wooden sasara girders 11, and supporting it. 3 and FIG. 4, a flat plate for fixing a corrugated plate, in which both ends are fixed to the horizontal step portion 11c of each step of the pair of sasara girders 11, as shown in FIGS. 50 and a plate accommodation digging portion 51 having a depth similar to the thickness of the flat plate 50 for fixing the step plate, which is formed by cutting the lower surface side of the step plate 12.

  As shown in FIGS. 3 and 5, the step plate fixing flat plate 50 includes girder fixing portions 50 a at both end portions arranged on top of the upper surface of the horizontal step portion 11 c of the pair of wooden sasara girders 11. It consists of a step plate fixing portion 50b provided continuously between the girder fixing portions 50a, and the girder fixing portion 50a protrudes from the step plate fixing portion 50b to the kicking step portions 11d of the pair of sasalar girds 11. In addition, a girder fixing hole 50d is formed in the girder fixing portion 50a, and a step plate fixing hole 50e is formed in the step plate fixing portion 50b. As shown in FIGS. 4 and 6 (b), the plate housing digging portion 51 is formed to have a planar shape that can accommodate the entire flat plate 50 for fixing the step plate.

  In a state where the beam fixing portions 50a at both end portions are overlapped with the horizontal step portions 11c of each step of the pair of sasara girders 11 while the contact protrusions 50c are in contact with the kicking step portions 11e (see FIG. 3). Then, a fixing member 52 such as a fixing screw or a fixing nail is driven into the girder fixing hole 50d from above the step plate fixing flat plate 50 to fix the step plate fixing flat plate 50 to the pair of sasara girders 11. While the fixed flat plate 50 is accommodated in the plate accommodating digging portion 51 and the step plate 12 is superposed on the step plate fixed flat plate 50 (see FIG. 4), a fixing screw and a fixing are provided from below the step plate fixing flat plate 50. By driving a fixing member 52 such as a nail into the step plate fixing hole 50e, the step plate 12 is fixed to the horizontal step portion 11c of each step of the pair of sasara girders 11 via the step plate fixing flat plate 50. Yes.

  Moreover, in this embodiment, the plate accommodation excavation part 51 formed in the lower surface side of the step board 12 is shown in FIG.6 (b) and FIG. A portion corresponding to the rear edge concave portion 50f (see FIG. 5) surrounded by the pair of contact convex portions 50c and the corrugated plate fixing portion 50b is left as the rear end covering portion 51f. .

  Furthermore, in this embodiment, as shown in FIGS. 3 and 5, the pair of contact protrusions 50 c at both end portions of the step plate fixing flat plate 50 have the same interval as the design interval of the pair of saras girders 11. By being held and provided, it functions as a guide when positioning the pair of Sasara girders 11.

  In the present embodiment, the sasara girder 11 is made of laminated wood in which a large number of wood end materials are stacked and joined together through an adhesive. As shown in FIGS. 2 and 3, the sasara girder 11 has a thickness in the girder width direction of, for example, about 30 to 150 mm, for example, by factory processing, and between the joining wall surface 23 and the floor portion 21 on the first floor. For example, it is formed so as to have a length capable of being installed obliquely at an inclination angle θ of about 20 to 56 degrees. Further, the sasara girder 11 is provided with a vertical joining end surface 11a arranged along the joining wall surface 23 at the upper end portion when obliquely installed, and arranged along the floor portion 21 on the first floor at the lower end portion. It is formed so as to have a horizontal mounting end face 11b. Further, the sasara girder 11 is formed so that the lower edge extends obliquely in a straight line along the gradient of the open staircase 20 when it is installed obliquely, and the upper edge is formed on the upper edge. In addition, a plurality of stepped step portions each including a horizontal step portion 11c and a kick step portion 11d are formed.

  Moreover, in this embodiment, as shown in FIG.3, FIG.7 and FIG.8, the upper end part of the sasara girder 11 makes the positioning plates 14a and 14b protrude, and fixing members, such as a fixing screw, are attached to the joining wall surface 23. FIG. It is a joining wall surface 23 perpendicular to the extending direction of the sasara girders 11 by the joining structure of the joining hardware 13 fixed by using and the positioning notches 16 respectively formed at the upper ends of the pair of sasara girders 11. It joins to the upper end part of the abutting wall surface which is the level | step difference surface of the floor part 21 of the first floor, and the floor part 22 of the mezzanine floor.

  That is, the metal joint 13 includes a substrate plate 15 including a pair of girder bonding plate portions 15a arranged on the left and right sides and a connecting plate portion 15b for connecting these girder bonding plate portions 15a, and a pair of girder bonding of the substrate plates 15. The first positioning plate 14a on both the left and right sides and the second positioning plate 14b on both the left and right sides are provided so as to protrude vertically from the plate portion 15a. The first positioning plates 14a on both the left and right sides extend in parallel while maintaining the same interval as the design interval of the pair of sasara girders 11 so as to be arranged along the inner side surfaces of the pair of sasara girders 11, respectively. And are attached to the pair of girder bonding plate portions 15a in the vertical direction. The second positioning plates 14b on the left and right sides extend in the lateral direction perpendicular to the first positioning plate 14a and have a length that does not exceed the lateral width of the sasara girders 11 in a region outside the first positioning plates 14a. It is attached.

  As shown in FIGS. 7 and 8, the positioning notch 16 is cut from the joining end surface 11a of the upper end of the sasara beam 11 in a direction perpendicular thereto and at a height position corresponding to the second positioning plate 14b. And a first notch 16a formed with a cut width substantially the same as the thickness of the second positioning plate 14b and a cut depth substantially the same as the protruding length of the second positioning plate 14b. The inner side surface of the upper end portion of each of the metal fittings 13 fixed to the bonding wall surface 23 is set along the first positioning plate 14a, and the second positioning plate 14b is inserted and locked in the first notch 16a. In this state, the upper ends of the pair of sasara girders 11 are joined to the joining wall surface 23 via the joining hardware 13 by being fixed using a fixing member such as a fixing screw.

  Further, in the present embodiment, the positioning notches 16 formed at the upper ends of the pair of sasara girders 11 have the inner side surfaces of the upper ends of the respective sasara girders 11 approximately the thickness of the first positioning plate 14a. It includes a second notch 16b formed by notching so as to have the same depth and the substantially same side shape as that of the first positioning plate 14a. In the state where the first positioning plate 14a is housed in the second notch 16b with respect to the joint hardware 13 fixed to the joining wall surface 23, the inner side surface of the upper end portion of the sasher girder 11 extends along the first positioning plate 14a. Is positioned.

  Furthermore, in the present embodiment, the positioning notches 16 formed at the upper ends of the pair of sasa girders 11 are arranged so that the joint end surface 11a of the upper end of the sasa spar 11 is moved outward from the inner edge of the joint end surface 11a. A third notch 16c formed by cutting out at a depth substantially the same as the thickness of the substrate plate 15 is included. In a state where at least a part of the girder bonding plate portion 15 a is accommodated in the third notch 16 c, the upper ends of the pair of sasalar girders 11 are respectively bonded to the bonding wall surface 23 via the bonding hardware 13.

  On the other hand, in the present embodiment, the lower end portion of the sasara girder 11 is joined to the floor surface of the floor portion 21 by a joining structure using an L-shaped fixing bracket 31 as shown in FIG. In other words, the placement end surface 11b at the lower end of the sasara girder 11 is placed in contact with the floor surface of the floor 21 so as to be along the floor surface of the floor portion 21 on the first floor. The lower end portion of the front end vertical surface 11 e at the lower end is fixed to the floor portion 21 using the L-shaped fixing bracket 31. The L-shaped fixing bracket 31 is a metal piece having an L-shaped cross-sectional shape including a vertical plate portion 31a having a plurality of screw fixing holes and a horizontal plate portion 31b having a plurality of screw fixing holes.

  An L-shaped fixing bracket 31 is arranged at a joint angle portion between the tip vertical surface 11e of the installed sarasara girder 11 and the floor portion 21, and the back surface of the vertical plate portion 31a is brought into close contact with the tip vertical surface 11e to be fixed. While fixing using a fixing member such as a screw, the bottom end of the vertical plate portion 31a is brought into close contact with the floor portion 21 and fixed using a fixing member such as a fixing screw, so that the lower end portion of the sasara girder 11 can be easily In addition, it can be fixed to the floor portion 21 in a stable state.

  Further, when the lower end portion of the sasara girder 11 is fixed to the floor portion 21, a notch groove that matches the shape of the L-shaped fixing bracket 31 is formed in a portion where the tip vertical surface 11 e overlaps the L-shaped fixing bracket 31, for example. By covering the L-shaped fixing bracket 31 with the cover material 32 made of the same laminated wood as the sasara girders 11, it is possible to maintain the design of the sasara girders 11. The length of the bottom horizontal step portion 11c of the sasara girder 11 is made shorter by the thickness of the cover member 32 than the length of the other step portions, so that the cover member 32 is covered with the tip vertical surface 11e. It is possible to maintain the length of the lowermost horizontal step portion 11c after being attached to the same length as the lengths of the other horizontal step portions 11c.

  And the corrugated board attachment structure 10 of this embodiment is installed between the floor part 21 of the first floor (lower floor) and the floor part 22 of the middle second floor (middle upper floor) as described above. It is a structure for forming an open staircase 20 by attaching a step plate 12 to each horizontal step portion 11c of a wooden sasara girder 11 and attaching it to a flat plate shape as shown in FIGS. The flat plate 50 for fixing the step plate, and a plate accommodation digging portion 51 formed by cutting the lower surface side of the step plate 12 are configured.

  The flat plate 50 for fixing a step plate is formed by, for example, cutting a steel plate member having a thickness of about 2 to 10 mm. As shown in FIG. 5, the step plate fixing flat plate 50 is provided integrally and continuously between the girder fixing portions 50 a at both ends provided with the contact protrusions 50 c and these girder fixing portions 50 a. And a step plate fixing portion 50b. The flat plate 50 for fixing the step plate as a whole has a lateral width that is slightly shorter than the design length between the outer surfaces of the pair of wooden sasara girders 11, for example, about 640 to 710 mm, and is longer than the length of the horizontal step portion 11c. Also, it has a horizontally long and substantially rectangular planar shape with a vertical width of, for example, about 120 to 230 mm. In the flat plate 50 for fixing the step plate, the contact protrusions 50c of the girder fixing portions 50a on both sides protrude outward and rearward from the step plate fixing portion 50b, so A rear edge recess 50f surrounded on three sides by the step plate fixing portion 50b is formed along the rear long side portion arranged on the kicking step portion 11d side.

  In the present embodiment, the contact protrusions 50c on both sides project outward and rearward so as to have a horizontally long rectangular shape, and are provided so as to protrude between the inner sides of these contact protrusions 50c. The same interval as the design interval of the pair of sasara girders 11 is maintained. As a result, when the flat plate 50 for fixing the platen plate is fixed to each horizontal step portion 11c of the pair of sasara girders 11, the inner side portions of the contact projections 50c on both sides are the horizontal steps of the pair of sasara girders 11. It is possible to adjust and fix these positions while positioning the fixing flat plate 50 and the sasara girder 11 along the inner edge of the portion 11c, using the contact convex portion 50c as a guide. In addition, the fixing flat plate 50 and the sasara girders can be obtained without measuring the distance between the sasara girders 11 so that the pair of sasara girders 11 are arranged in parallel, and checking and adjusting each time. 11 can be positioned smoothly, and it is possible to effectively improve the workability when fixing the flat plate 50 for fixing the step plate.

  In the present embodiment, the pair of girder fixing portions 50a at both ends of the step plate fixing flat plate 50 is used when the step plate 12 is attached to the pair of sasara girders 11 via the step plate fixing flat plate 50. This is a portion that is arranged on the upper surface of the horizontal step portion 11 c of the sasara girder 11. A plurality (three in this embodiment) of girder fixing holes 50d are formed in the girder fixing portion 50a. In these girder fixing holes 50d, a fixing screw is preferably driven as a fixing member 52 so as to be screwed in from the upper side toward the horizontal step portion 11c of the sasara girder 11. It is fixed to the horizontal step portion 11c so as to straddle the Sasara gird 11. These girder fixing holes 50d are subjected to countersink processing that expands upward, and the head of the fixing member 52 driven in this way is fixed to the upper surface of the fixed flat plate 50 for fixing the corrugated plate. It is designed not to protrude from. In the present embodiment, the central girder fixing hole 50d 'of the three girder fixing holes 50d has a horizontally long and substantially track-circular opening shape as a long hole for adjustment.

  In the present embodiment, the step plate fixing portion 50 b between the pair of girder fixing portions 50 a of the step plate fixing flat plate 50 is fixed to the horizontal step portion 11 c of the pair of sasara girders 11. After that, in the space portion between the pair of sashers 11, the intermediate portion excluding both end portions of the step plate 12 is a portion overlapped from above. In the step plate fixing portion 50b, the step plate 12 is overlapped in a state where the step plate fixing portion 50b is accommodated so as to be fitted into the plate accommodation digging portion 51 formed on the lower surface of the step plate 12. (See FIG. 4). A plurality of (six in this embodiment) step plate fixing holes 50e are formed in the step plate fixing portion 50b. In these step plate fixing holes 50e, a fixing screw is preferably driven as a fixing member 52 so as to be screwed from below toward the lower surface of the stacked step plates 12 so that the pair of step plates 12 are paired. It is fixed to the horizontal step portion 11 c via the step plate fixing flat plate 50 so as to straddle the sasara girders 11. These step plate fixing holes 50e are countersunk with a diameter expanding downward, and the head of the fixing member 52 driven in this way is fixed to the fixed plate 50 for fixing the step plate. It does not protrude from the lower surface.

  The corrugated board 12 in which the plate accommodation digging part 51 is formed is made of laminated timber in which a large number of wood end materials are laminated and joined together through an adhesive. As shown in FIGS. 6A to 6C, the corrugated plate 12 has a thickness of, for example, about 30 to 60 mm, for example, by factory processing, and has a horizontal width of about 750 to 10,000 mm and a vertical width of 150 to 300 mm, for example. It is formed so as to have a horizontally long rectangular planar shape. By cutting the lower surface side of the corrugated plate 12, the plate accommodating digging portion 51 has a depth of about 2 to 10 mm, for example, similar to the thickness of the corrugated plate fixing flat plate 50, and is fixed to the corrugated plate. The flat plate 50 is formed to have a planar shape that can be accommodated.

  That is, in the present embodiment, the plate accommodating digging portion 51 preferably has a shape in which the flat plate 50 for fixing the platenage is fitted so as to be fitted tightly, and the contact protrusion 50c in the flat plate 50 for fixing the platenage is formed. A portion corresponding to the end portion receiving portion 51a having the convex portion receiving portion 51c and a portion corresponding to the step plate fixing portion 50b in the flat plate 50 for fixing the step plate. It is formed so as to have a planar shape including an intermediate portion accommodating portion 51b formed continuously between the end portion accommodating portions 51a on both sides.

  Moreover, in this embodiment, the plate accommodation digging part 51 is formed in the state which left the part corresponding to the rear edge recessed part 50f of the flat plate 50 for plate fixing as the rear-end coating | coated part 51f, without cutting. As a result, only the convex portion accommodating portion 51c corresponding to the contact convex portion 50c of the flat plate 50 for fixing the step plate is formed facing the rear end surface 12a of the step plate 12 and opened. . As a result, when the step plate 12 is attached to the pair of sasara girders 11 via the step plate fixing flat plate 50, the contact convex portion 50c of the step plate fixing flat plate 50 is covered with the convex portion accommodating portion 51c. Thus, the rear end surface 12 a of the step plate 12 can be brought into contact with the kicking step portion 11 d of the sasara beam 11. Further, in this manner, in the portion between the pair of Sasara girders 11, the rear end surface of the step plate fixing portion 50b of the step plate fixing flat plate 50 is covered with the rear end covering portion 51f from the rear, and the step plate 12a Can be fixed to a pair of Sasara girders 11.

  In the present embodiment, the handrail 24 is attached to the upper surface of the corrugated board 12 in a state where the handrail 24 is installed upright along the side part of the corrugated corrugated board 12 (see FIGS. 1 and 2). A handrail locking hole 12b for locking the lower end of the handrail 24a is formed (see FIG. 6A). Further, the rear end surface 12a of the uppermost step plate 12 supported by the sasara girder 11 is not cut from the lower side portion to the upper side portion at a depth similar to the thickness of the connecting plate portion 15b of the joint hardware 13. A plate storage step 12c is formed (see FIG. 3). As a result, when the uppermost step plate 12 is supported by the sasara beam 11, the rear end surface of the step plate 12 is brought into contact with the joining wall surface 23 in a state where the connecting plate portion 15b is stored in the plate storage step portion 12c. It becomes possible to contact. Furthermore, a front pad or the like can be attached to the upper surface of the step plate 12 as long as the design of the wooden open staircase 20 is not impaired.

  In the corrugated plate mounting structure 10 of the present embodiment, the girder fixing portions 50a at both ends of the flat plate 50 for fixing the corrugated plate are brought into contact with the horizontal step portions 11c of the respective steps of the pair of sasara girders 11 as described above. In a state where the protrusions 50c are brought into contact with the kicking step portion 11e and overlapped (see FIG. 3), a fixing member 52 such as a fixing screw or a fixing nail is fixed to the girder fixing hole 50d from above the flat plate 50 for fixing the step plate. The flat plate 50 for fixing the plate is fixed to the pair of sasara girders 11. After that, with the step plate fixing flat plate 50 being accommodated in the plate accommodation digging portion 51, the step plate 12 is superimposed on the step plate fixing flat plate 50 (see FIG. 4), and below the step plate fixing flat plate 50. Then, a fixing member 52 such as a fixing screw or a fixing nail is driven into the step plate fixing hole 50e. Accordingly, the step plates 12 of each step can be easily fixed to the horizontal step portions 11c of the steps of the pair of saras girders 11 through the step plate fixing flat plate 50, respectively.

  When the step plates 12 are attached, the handrails 24 are attached in a state of being erected along one side portion of the step plates 12 that are arranged in a stepwise manner, for example, by a method similar to the conventional method. As a result, a wooden open staircase 20 as shown in FIGS. 1 and 2 is formed.

  And according to the corrugated board attachment structure 10 of this embodiment provided with the above-mentioned structure, without forming a dowel hole in the upper surface of the corrugated board 12 or using a buried wood dowel material, it is easy by a simple structure. In addition, in a stable state, it is possible to fix the step plate 12 to the sasara girder 11 and to form a wooden open staircase 20 with excellent design.

  That is, according to this embodiment, the flat plate-like flat plate fixing plate 50 and the thickness of the flat plate 50 for fixing the step plate formed by cutting the lower surface of the step plate 12 are the same. A dowel hole is formed in the upper surface of the corrugated board 12 by a simple construction consisting of a plate housing digging portion 51 of a depth of depth and a simple operation of simply driving a fixing member 52 such as a fixing screw. As described above, the step plate 12 can be fixed to the sasara beam 11 easily and stably without using a material. In addition, according to the present embodiment, the flat plate 50 for fixing the metal step plate has the upper surface and the peripheral end surface thereof except for the lower surface of the portion arranged between the pair of sasara girders 11. Since it is covered with the wooden step board 12 and the wooden sara girder 11 without projecting downward from the lower surface of the wood, the wooden plate excellent in design without impairing the aesthetic appearance by the flat plate 50 for fixing the step board. The open staircase 20 can be formed.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the plate housing digging portion formed on the lower surface side of the step plate has a plane shape similar to that of the flat plate for fixing the step plate so that the flat plate for fixing the step plate can be fitted tightly. It does not necessarily need to be formed, and can be formed so as to have a larger planar shape than the flat plate for fixing the step plate. It is not always necessary to form the plate accommodating digging portion so as to leave a portion corresponding to the concave portion of the rear edge of the flat plate for fixing the plate, and the pair of contact convex portions at both end portions of the flat plate for fixing the plate is a pair. It is not always necessary to provide an interval similar to the design interval of the Sasara girders. As long as the flat plate for fixing the step plate has a strength capable of supporting a load from the step plate, in addition to a metal plate member such as a steel plate member, for example, a plate member made of synthetic resin Etc. can also be used.

DESCRIPTION OF SYMBOLS 10 Step plate attachment structure 11 Sasara girder 11a Joining end surface 11b Placement end surface 11c Horizontal step part 11d Kicking step part 12 Step board 12a Rear end surface 13 Joining metal object 14a First positioning plate 14b Second positioning plate 15 Substrate plate 16 Positioning notch Section 20 Open staircase 21 Floor section 22 on the first floor (lower floor) Floor section 23 on the middle second floor (middle upper floor) Joint wall surface 24 Handrail 31 L-shaped fixing bracket 32 Cover material 50 Flat plate 50a for fixing the step plate Girder fixing section 50b Step plate fixing portion 50c Abutting convex portion 50d Girder fixing hole 50e Step plate fixing hole 50f Rear edge concave portion 51 Plate accommodating digging portion 51a End portion accommodating portion 51b Intermediate portion accommodating portion 51c Convex portion accommodating portion 51f Rear end covering portion 52 Fixed member

Claims (5)

It is a corrugated board mounting structure that forms an open staircase by attaching a plurality of wooden corrugated boards supported by a pair of wooden sasara girders,
A flat plate for fixing a plate, which is attached to each of the horizontal steps of each pair of Sasara girders,
It is formed by cutting the lower surface side of the corrugated plate, and is composed of a plate accommodation digging portion having a depth similar to the thickness of the flat plate for fixing the corrugated plate,
The flat plate for fixing the step plate is composed of a girder fixing portion disposed at both ends overlapping the upper surface of the horizontal step portion, and a step plate fixing portion continuously provided between these girder fixing portions. The girder fixing part includes a protrusion projecting to the kicking step part of the pair of sasara girders protruding from the step plate fixing part, and the girder fixing part has a girder fixing hole. Step plate fixing holes are formed in the plate fixing portions, respectively,
The plate accommodating digging portion is formed to have a planar shape that accommodates the entire flat plate for fixing the step plate,
For fixing the corrugated plate in a state where the beam fixing portions at both end portions are overlapped with the horizontal step portion of each step of the pair of sasara girders while the abutting convex portion is in contact with the kicking step portion. By driving a fixing member into the girder fixing hole from above the flat plate, the step plate fixing flat plate is fixed to the pair of sasara beams, and the step plate fixing flat plate is received in the plate receiving digging portion. While the step plate is superposed on the step plate fixing flat plate, a fixing member is driven into the step plate fixing hole from below the step plate fixing flat plate so that the step plate is fixed to the step plate fixing plate. A step plate mounting structure fixed to the horizontal step portion of each step of the pair of sasara girders via a flat plate.   The plate housing digging portion formed on the lower surface side of the step plate is surrounded on three sides by the pair of abutting convex portions and the step plate fixing portion at both ends of the flat plate for fixing the step plate. 2. A corrugated board mounting structure according to claim 1, wherein the corrugated board mounting structure is formed in a state where a portion corresponding to the trailing edge recess is left.   The pair of abutment protrusions at both ends of the flat plate for fixing the step plate is provided with the same interval as the design interval of the pair of sasara girders, thereby positioning the pair of sasara girders. The corrugated board mounting structure according to claim 1, which functions as a guide when performing. A flat plate for fixing a plate used for the plate mounting structure according to claim 1 or 2,
It consists of a girder fixing part at both ends arranged on the upper surface of the horizontal step part of each stage of a pair of Sasara girders, and a corrugated board fixing part provided continuously between these girder fixing parts, The girder fixing portion includes a protrusion projecting from the stepped plate fixing portion to the kicking step portion of the pair of sasara girders, and the girder fixing portion includes a girder fixing hole and the stepboard fixing portion. A flat plate for fixing a plate, in which a plate plate fixing hole is formed in each part.   The pair of abutment protrusions provided on the girder fixing portions at both end portions are provided with the same interval as the design interval of the pair of sasara girders, thereby positioning the pair of sasara girders. The flat plate for fixing a step plate according to claim 4, which functions as a guide for performing.

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