JP4125254B2 - Construction method of house using strip stairs and mounting structure of strip stairs - Google Patents

Description

  The present invention relates to a housing construction method using a strip staircase provided in a house interior and a strip stair mounting structure.

  A strip staircase is known as an indoor staircase in a house. This strip staircase is constructed by attaching a plurality of step plates to two sheathing girders and attaching handrails to these step plates. The step plates are attached to the upper surface of the sheathing girders by nailing or the like. For example, a triangular corrugated plate support member (see, for example, Patent Document 1).

  Such a strip staircase improves the appearance of a living room and is excellent in ventilation and lighting, and demand is increasing recently.

By the way, when constructing a two-story or more house, there is a case where after building the frame, the staircase may be assembled later, especially when a highly staircase like a strip staircase is attached. In, the staircase was assembled in the interior of the room.
Japanese Patent Laid-Open No. 11-303216

  However, in the case of such a construction method, until a staircase is installed on the upper floor, the opening for attaching the staircase must be surrounded by a handrail so that no one can fall out of the opening. .

  In addition, in order to proceed with the construction of the upper floor until the stairs are installed, it is necessary to climb a ladder as a temporary lifting means, for example, raising and lowering with objects is inconvenient. There was a desire for improvement.

  In addition, replacing the ladder etc. with the method of setting the staircase cured from the beginning to the upper floor and the lower floor can solve the above-mentioned construction problems, but the floor under the stairs, etc. When doing this, the stairs must be removed, and there is a drawback that construction takes time.

  The problem of the present invention is that even if the strip staircase is assembled from the beginning at the time of housing construction, the finishing work of the floor under the staircase can be performed without removing the staircase, thereby allowing the construction work to proceed safely. An object of the present invention is to provide a housing construction method using a strip staircase and a strip staircase mounting structure, which can easily go back and forth between the upper floor and the lower floor and can efficiently proceed with the construction work of the house.

The invention according to claim 1 includes a saddle girder 2 installed obliquely across the upper and lower floors, and a corrugated plate support member 3 provided on the saddle girder 2 at predetermined intervals in the longitudinal direction of the weir girder 2, After assembling the upper floor, the strip staircase 1 mainly composed of the plurality of step boards 4 supported by the corrugated board support members 3 is bridged from the lower floor to the installation position of the staircase, In the construction method of the house that was used as
A receiving member 6 for positioning the girder is attached to the floor A of the lower floor in advance, and a recess 2c that can receive the receiving material 6 is formed on the lower surface of the rafter 2 so that A method of assembling the strip staircase 1 by fitting the receiving material 6 into 2c,
When the receiving material 6 is fitted into the recess 2c of the sheathing girder 2 with respect to the height of the receiving member 6, a clearance g corresponding to the thickness t of the flooring material F is provided between the lower surface of the sheathing beam 2 and the floor surface A. It was set as the solution means of the said subject to set in this way.

  According to the first aspect of the present invention, a strip staircase mainly composed of a spar 2 formed integrally with the step plate support member 3 and a plurality of step plates 4 supported by the step plate support member 3. 1 is assembled to the upper and lower floors after assembling the upper floor part of the house, so that lifting means can be secured without using a ladder, etc. during construction. By fitting the receiving material 6 on the floor surface A, it can be easily attached, and the height of the receiving material 6 is such that a gap g is provided between the flooring material F and the bottom surface of the spar girder. Therefore, the space for attaching the flooring material F can be secured.

  In the invention according to claim 2, when the flooring material F is laid on the floor surface A of the lower floor, the flooring material F is inserted into the gap g between the bottom surface of the spar 2 and the floor surface A with the receiving material 6a attached. Thus, finishing the floor surface A was used as a solution to the above problem.

  According to the invention described in claim 2, the space for inserting the flooring material F can be secured, and the flooring material F is inserted into the gap g between the bottom surface of the spar girder 2 and the floor surface A while the receiving material 6a is attached. Since the surface A is finished, there is no need for construction work.

  In the invention according to claim 3, when the flooring material F is laid on the floor surface A of the lower floor, the receiving material 6b is removed, and the flooring material F is inserted into the gap g between the lower surface of the spar girder 2 and the floor surface A. In order to solve the above-mentioned problem, the positioning girder 2 is fixed to the floor surface A together with the positioning receiving material 6c by fitting the receiving material 6c for positioning into the concave portion 2c of the girder 2.

  According to the invention described in claim 3, by removing the receiving member 6b, there is a gap corresponding to the thickness t of the flooring material F, so that the space into which the flooring material F is inserted is between the lower surface of the spar 2 and the floor surface A. A clearance can be secured in between, and the flooring material F can be easily laid without the receiving material 6b interfering with the flooring material F.

The invention according to claim 4 includes a saddle girder 2 installed obliquely across the upper and lower floors, and a corrugated plate support member 3 provided on the saddle girder 2 at predetermined intervals in the longitudinal direction of the reed girder 2, In the strip staircase 1 composed mainly of a plurality of step plates 4 respectively supported by these step plate support members 3,
The floor A of the lower floor is provided with a receiving member 6 for positioning the girder. On the lower surface of the reed girder 2, a recess 2c for accommodating the receiving member 6 is formed. A structure for assembling the spar 2 by fitting the receiving member 6,
The height of the receiving material 6 is such that when the receiving material 6 is fitted into the recess 2c of the sheathing girder 2, there is a clearance g corresponding to the thickness t of the flooring material F between the lower surface of the sheathing beam 2 and the floor surface A. Setting as described above is the means for solving the problems.

According to the fourth aspect of the present invention, the receiving material 6 for positioning the girder is attached to the floor surface A of the lower floor, and the receiving material 6 is fitted into the recess 2c formed on the lower surface of the girder 2. The strip staircase 1 can be assembled by inserting.
Further, the height of the receiving member 6 for positioning the girder is set so that the clearance g is equal to the thickness t of the flooring material F between the lower surface of the girder 2 and the floor surface A. Space for inserting F can be secured, and thereby, the flooring material F can be constructed in a state where the stairs 1 are attached.

According to the first aspect of the present invention, the safety of construction work of a house, particularly construction work near the opening of the upper floor can be enhanced by bridging the strip staircase 1 to the upper and lower floors to be used as a scaffolding at the construction site. In addition, it is possible to easily go back and forth between the upper floor and the lower floor using the strip staircase 1.
Further, the height of the receiving member 6 for positioning the girder is set so that there is a clearance g corresponding to the thickness t of the flooring material F between the lower surface of the girder 2 and the floor surface A. A space for inserting F can be secured, and the flooring material F can be easily laid on the floor surface A of the lower floor, so that the construction work of the house can be carried out efficiently.

  According to invention of Claim 2, the height of the said receiving material 6a is set so that the clearance for the thickness t of the flooring material F may be opened, and the lower surface of the spar 2 is attached with the receiving material 6a attached. Since the flooring material F can be easily inserted into the gap g between the flooring A and the floor surface A, the finishing operation using the flooring material F can be efficiently performed.

  According to the invention of claim 3, by removing the receiving material 6b, there is a gap corresponding to the thickness t of the flooring material F, so that a space for inserting the flooring material F can be secured, and the receiving material 6b is interfered with. The flooring material F can be easily installed without any problems.

According to the fourth aspect of the present invention, the receiving member 6 for positioning the girder is attached to the floor surface A of the lower floor, and the recess 2c that allows the receiving material 6 to be accommodated on the lower surface of the reeding beam 2. By forming the receiving member 6 and the recess 2c together, it is possible to provide a mounting structure that allows the strip staircase 1 to be easily assembled.
Further, the height of the receiving member 6 for positioning the spar is set so that a clearance g corresponding to the thickness t of the flooring material F is provided between the bottom surface of the spar 2 and the floor surface A. Since the flooring material F can be inserted between the lower surface of the girder 2 and the floor surface A, it is possible to provide an attachment structure capable of efficiently proceeding with the finishing work using the flooring material F.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a housing construction method using a strip staircase 1 and a mounting structure for a strip staircase 1 according to the present invention will be described in detail with reference to the drawings.

  The strip staircase 1 used here includes a saddle girder 2 that is installed diagonally across the upper and lower floors, and a step plate support member 3 that is provided at a predetermined interval in the longitudinal direction of the saddle girder 2 in the longitudinal direction. The plurality of step plates 4 respectively supported by the step plate support members 3 are mainly configured.

  As shown in FIG. 1, the right and left two vertical beams 2 are used for the vertical beam 2 in the ascending direction, and a plurality of step plate support portions 3 are provided on the upper inclined surface 2 a. It has been.

  Further, a projection 2b that fits into the fitting portion 5a of the sheath receiving body 5 provided at the stair installation position in the upper floor portion is provided at the upper end of the sheath girder 2, and at the lower end, the sagittal girder A recess 2c is provided that can accommodate the receiving material 6a for positioning.

  Further, the sheath girder 2 is covered with a sheath girder cover 9 which is an exterior member so that the seam is not visible.

  Note that the configuration is substantially the same except that the right and left sides are different from each other, and the details will be described below with the right-side sword 2.

  The corrugated plate support 3 is formed by being cut out integrally with the spar 2 by, for example, machining by NC (Numerical Control) control or the like.

  As shown in FIG. 2 (a), the corrugated board support portion 3 is provided so as to protrude from the inclined surface 2a, and its upper surface becomes horizontal when the spar 2 is attached to the building frame. It is formed as follows. In addition, a substantially rectangular parallelepiped groove 3 a that is long in the front-rear direction is provided on the upper surface of the corrugated plate support 3.

  The position of the groove 3a may be provided at either the left or right end of the upper surface, or may be provided at the center of the upper surface as shown in FIG.

  As shown in FIGS. 4 and 5, the protruding portion 2 b is provided at the upper end portion of the sheathing girder 2 and fits into the fitting portion 5 a of the sheath receiving body 5 provided at the installation position of the upper floor stairs. It is formed in a matching shape.

  Further, as shown in FIG. 5, the sacrificial receptacle 5 faces the opening of the upper floor and is provided at the end of the floor A panel. Furthermore, the fitting part 5a is provided in two places so that the protrusion part 2b of the said sheathing girder 2 may be hooked and fitted near the center of the edge part.

  As shown in FIG. 4, the concave portion 2 c is provided on the lower surface of the lower end portion of the sheathing girder 2 and is formed so that the receiving member 6 for positioning the cage girder can be accommodated.

  Further, as shown in FIG. 6A, the receiving material 6a for positioning is provided in advance on the lower floor surface A at a position where the spar 2 is to be installed, and the receiving material 6a. In order to allow the flooring material F to be inserted into the floor surface A with the floor mounted, the gap g is set to be high by a thickness t of the flooring material F.

  Furthermore, as shown in FIG. 6 (b), the receiving material 6b is provided in advance on the lower floor surface A at a position where the spar 2 is to be installed. The thickness t of the receiving material 6b is formed to the same dimension as that of the flooring material F so that the flooring material F can be inserted after the receiving material 6b is removed.

  As shown in FIG. 2 (b), the step plate 4 is provided with a notch 7 having a slope 7 a and a vertical surface 7 b at the center of the lower surface of the step girder 2 side. In a state where the step plate 4 is attached to the spar 2, the notch 7 is engaged with the spar 2.

  Further, the inclined surface 7a is inclined in the front-rear direction, and the inclination is equal to the inclination of the inclined surface 2a of the saddle girder 2 attached to the building frame. The inclined surface 7a is provided so as to abut on the inclined surface 2a in a state where the notch 7 is engaged with the sheath beam 2.

  The width of the vertical surface 7b is equal to the width of the spar 2 and is provided so as to contact the side surface 2d with the notch 7 engaged with the spar 2.

  Further, an attachment member 8 having a substantially rectangular parallelepiped shape that is long in the front-rear direction is provided behind the notch 7 on the lower surface of the step plate 4. The width of the attachment member 8 is substantially equal to the width of the groove 3a of the step plate support portion 3 of the spar 2 and the attachment member 8 is engaged with the groove 3a. The longitudinal position and angle of the step plate 4 with respect to the spar 2 are determined by engaging the longitudinally long mounting member 8 with the longitudinally long groove 3a.

  In addition, it is preferable that the length and height of the attachment member 8 are comparable as the groove | channel 3a. If the length or height of the attachment member 8 is approximately the same as that of the groove 3a, there are few gaps left after the step plate 4 is attached to the spar 2, and the contact area becomes large. For this reason, when an adhesive is used to fix the step plate 4 and the spar 2, the bonding area can be increased.

  Further, the position of the attachment member 8 is provided in accordance with the position of the groove 3a of the corrugated board support portion 3, and in FIG. 2B, it is provided behind either the left or right end of the notch 7. For example, when the groove 3a is provided in the center of the upper surface of the stepped plate support portion 3 as shown in FIG. 3A, the groove 3a is provided at a corresponding position behind the notch 7 as shown in FIG. Just do it.

  The step plate 4 can also be formed integrally with the attachment member 8 using an NC-controlled milling cutter or the like. The attachment member 8 may be attached to the corrugated board 4 with a wooden screw or the like.

  In addition, although the step board 4 is described in the rectangular parallelepiped shape in FIG.2 (b) and FIG.3 (b), if it is flat shape, it can be set as arbitrary shapes, such as circular and an ellipse.

As shown in FIG. 7 (a), the spar girder cover 9 is made of synthetic resin, for example, W _S (woody series) olefin plywood, which is a composite plywood formed by bonding an olefin sheet to the plywood. As shown in FIG. 7B, the seam when the sheathing girder 2 is covered is directed between the two sheathing girders 2 so that it cannot be seen.
A plurality of holes 9 a through which the step plate support 3 can be inserted are formed in the surface of the sheath girder cover 9. These holes 9a can also be machined by NC machining or the like in the same manner as the corrugated plate support 3 or the like.

  Further, as shown in FIG. 7 (c), the folding part D of the spar girder cover 9 is provided on both sides of the folding line with a predetermined thickness on the folding part D from one side to the other. A V-cut portion K cut at an angle of α °, for example, 45 ° toward the side is formed. Therefore, when the spar girder cover 9 is folded, the notch portions K on both sides sandwiching the fold line M come into contact with each other, so that even if the spar girder cover 9 has some thickness t, it can be easily and accurately. Can be folded.

Further, all visible portions such as the step plate support portions 3 and the step plates 4 are covered with a cover which is an exterior member formed of the _WS olefin plywood.

  Although not shown, the cover that covers the step plate support portion 3 is formed so as to be able to cover the visible portion between the spar 2 and the step plate 4.

  On the other hand, the corrugated plate cover 10 that covers the corrugated plate 4 is, for example, the corrugated plate cover 10 formed in the unfolded structure as shown in FIG. 8A as shown in FIG. It is configured to cover the entire surface so that the joints and the like cannot be seen. In this embodiment, the corrugated plate cover 10 having the above-described configuration is used as the corrugated plate cover 10, but if it can be put on the corrugated plate 4 and can improve the appearance quality and function, the corrugated plate cover 10 has the above-described configuration. It is not limited to the corrugated board cover 10.

  Next, the mounting structure of the strip staircase 11 having the above configuration will be described.

  First, as shown in FIGS. 4 and 5, the girder 2 having a plurality of step board support portions 3 is attached to the building frame. At this time, it is preferable that the sheath girder cover 9 is previously covered with the sheath girder 2 and the sheath girder 2 is covered.

  And the protrusion part 2b of the upper end of the sheathing girder 2 is fixed to the fitting part 5a of the sheathing receiving body 5 provided in the upper floor. As shown in FIG. 5, the fitting part 5a is fixed by fitting both together. Or you may fix with a volt | bolt etc. arbitrarily.

  On the other hand, the lower end of the sagittal girder 2 is fitted with a recess 6c provided on the lower surface of the sagittal lower end to a receiving material 6a installed in advance on the floor surface A of the lower floor. Install on floor A.

  Moreover, it may replace with the receiving material 6a and may attach the spar girders 2 using the receiving material 6b. In this case, the girder 2 is placed on a receiving member 6b provided in advance at a predetermined position on the floor surface A, and temporarily fixed with a screw or the like.

  In addition, it is preferable to use the most suitable one based on the construction situation at the site, the structure of the house, and the like, which receiving material 6 is used.

  Next, when the saddle girder 2 is mounted across the upper and lower floors, the corrugated board 4 is sequentially attached to the corrugated board support part 3 of the sagittal girder 2.

First, the attachment member 8 is engaged with the groove 3 a of the step plate support portion 3 of the spar 2. As a result, the lateral position and angle of the step plate 4 with respect to the spar 2 are determined, and the lower surface of the step plate 4 and the upper surface of the step plate support portion 3 come into contact with each other, so that the vertical position is determined. Become.
Next, when the inclined surface 7a of the step plate 4 is brought into contact with the inclined surface 2a of the sheathing girder 2, as shown in FIG. 2C or FIG. Determined.

  When the position of the step plate 4 is determined, the sheath beam 2 and the step plate 4 are fixed with screws or the like. In addition, you may use an adhesive agent together when fixing. The remaining step plates 4 are fixed to the spar 2 in the same manner.

  When all the corrugated boards 4 are attached to the spar 2, the handrail 11 is attached as necessary. When the handrail 11 is provided, a hole for attaching the handrail is formed at a position where the handrail 11 of the corrugated board 4 is to be provided, and at the same time, the corrugated board cover 10 that covers the corrugated board 4 in the subsequent process is provided. Make a hole for attaching the handrail at the position.

  The corrugated board cover 10 is preferably attached immediately before completion in order to prevent scratches during construction of the house. On the other hand, since the cover covering the corrugated plate support 3 is provided at the lower part of the corrugated plate 4, the order of attachment is preferably attached in an arbitrary order as necessary.

  Once such a mounting structure is installed as a scaffold for the opening of the upper floor and as an elevating means for the upper floor and the lower floor, the floor surface A of the lower floor near the strip stairs 1 is then constructed.

  When laying the flooring material F on the floor surface A of the lower floor, the receiving material 6a is set to be high with a clearance g corresponding to the thickness t of the flooring material F. Therefore, while the receiving material 6a is attached, The floor surface A is finished by inserting the flooring material F into the gap g between the lower surface of the beam 2 and the floor surface A.

As another embodiment, a receiving material 6b set to the thickness t of the flooring material F is used.
When laying the flooring material F, the receiving material 6b is removed, the flooring material F is inserted into the gap g between the lower surface of the sheathing girder 2 and the floor surface A, and then the positioning receiving material in the recess 2c of the weiring beam 2 6c is inserted, and the balance girder 2 is fixed to the floor surface A together with the receiving material 6c for positioning.

  By using either method to construct the lower floor A, the flooring material F can be easily installed on the floor A, and the strip staircases are installed as scaffolding or lifting means during construction. Since the construction of the house can proceed while 1 is attached, the construction work of the house can be proceeded efficiently.

  Hereinafter, with reference to drawings, the Example of the construction method of the house using the strip staircase 1 of this invention is described in detail. In the above embodiment, the method of constructing the floor surface A with the strip staircase 1 installed is described, but in this embodiment, a method of constructing the wall surface B near the staircase with the strip staircase 1 installed is described.

In the strip staircase 1 used in the present embodiment, the spar 2 is installed obliquely across the upper and lower floors, and the step support is provided on the spar 2 in the longitudinal direction of the spar 2 at predetermined intervals. The member 3 and a plurality of temporary corrugated plates 12 supported by the corrugated plate support members 3 are mainly configured.
In addition, since the same thing as the structure used for the said embodiment is used for the said spar 2 and the some step board support member 3, description is abbreviate | omitted in a present Example.

  Like the step plate 4 shown in FIG. 2 (b), the plurality of temporary step plates 12 are provided with a notch 7 made of a slope 7a and a vertical surface 7b at the center of the lower surface of the counter girder 2 side. ing. In a state where the temporary plate 12 is attached to the spar 2, the notch 7 is engaged with the spar 2.

  Further, the inclined surface 7a is inclined in the front-rear direction, and the inclination is equal to the inclination of the inclined surface 2a of the saddle girder 2 attached to the building frame. The inclined surface 7a is provided so as to abut on the inclined surface 2a in a state where the notch 7 is engaged with the sheath beam 2.

  The width of the vertical surface 7b is equal to the width of the spar 2 and is provided so as to contact the side surface 2d with the notch 7 engaged with the spar 2.

  Further, an attachment member 8 having a substantially rectangular parallelepiped shape that is long in the front-rear direction is provided behind the notch 7 on the lower surface of the temporary step plate 12.

  And the board width of this temporary corrugated board 12 is nearer to the width direction center than the board width of the said corrugated board 4 in order to affix fireproof gypsum board and wallpaper to the wall surface B, as shown in FIG. The gap from the end portion of the temporary corrugated plate 12 to the wall surface B is set to be wide.

  Next, the temporary corrugated board 12 having such a configuration is attached to the spar 2 using screws or the like. And by installing this staircase 2 across the upper and lower floors and installing stairs, a wide gap between the temporary plate 12 and the wall surface B can be easily pasted with plasterboard or wallpaper. Can be formed.

  In addition, after the plasterboard or wallpaper is pasted on the wall surface B, the construction efficiency of the lower floor wall can be changed without damaging the corrugated board 4 by replacing it with the corrugated board 4 immediately before the completion of the house. Can be improved. Furthermore, this temporary corrugated board 12 is preferable because it can be reused and can lead to saving of materials.

  By installing the strip staircase 1 constituted by using such a temporary step board 12 as a scaffold for the opening of the upper floor and as an elevating means between the upper floor and the lower floor, the wall surface of the lower floor in the vicinity of the strip staircase 1 Since B can be easily constructed, the construction work of the house can be efficiently performed.

  Needless to say, the strip staircase 1 used in the present invention can also be installed at a place corresponding to a landing.

It is a perspective view which shows an example of the attachment structure of the strip staircase of this invention. It is a figure which shows the example of a combination of a rocking girder and a tread board, (a) is a perspective view which shows the principal part of a rocking girder, (b) is a perspective view which shows a tread board, (c) is a rocking girder, a tread board, and It is a perspective view which shows the engagement state. It is a figure which shows the example of a combination of a rocking girder and a tread board, (a) is a perspective view which shows the principal part of a rocking girder, (b) is a perspective view which shows a tread board, (c) is a rocking girder, a tread board, and It is a perspective view which shows the engagement state. It is a side view which shows the attachment structure of strip stairs. It is a perspective view which shows the fixing method of a sacrificial receptacle and a protrusion part. It is a side view which shows the fixation structure of the recessed part of the bottom face of a shearing girder, and the receiving material for positioning of a girder. It is a figure which shows a sheathing girder cover, (a) is the top view which developed the sheathing girder cover, (b) is sectional drawing at the time of covering a sheathing girder cover, (c) is folding It is the schematic which showed the structure of the part. It is a figure which shows a corrugated board cover, (a) is the top view which expand | deployed the corrugated board cover, (b) is the schematic at the time of covering a corrugated board cover. It is the schematic at the time of installing a temporary corrugated board in a slab.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Strip stairs 2 Sasara girder 3 Step board support member 4 Step board 6 Receiving material 9 Sasara girder cover A Floor surface F Flooring material t Thickness g Clearance

Claims (4)

Sagittal girders installed diagonally across the upper and lower floors, corrugated plate support members provided at predetermined intervals in the longitudinal direction of the corrugated girders, and a plurality of support plates respectively supported by these corrugated plate support members In the construction method of the house, the strip staircase composed mainly of corrugated boards is assembled from the lower floor after the assembly of the upper floor, and is used as a scaffolding at the construction site.
A receiving member for positioning the girder is attached to the floor surface of the lower floor in advance, and a recess is formed on the lower surface of the rafter to accommodate the receiving material, and the receiving material is fitted into the recess of the rafter. A method for assembling strip stairs,
The height of the receiving material is set so that a gap corresponding to the thickness of the flooring material is provided between the bottom surface of the shearing girder and the floor surface when the receiving material is fitted in the recess of the sagittal girder. How to build a house using strip stairs. It is the construction method of the house using the strip stairs of Claim 1,
Strip stairs characterized by finishing floor by inserting flooring into the gap between the underside of the spar girder and the floor surface when flooring is laid on the floor of the lower floor Construction method of the house using It is the construction method of the house using the strip stairs of Claim 1,
When laying the flooring material on the floor of the lower floor, remove the receiving material, insert the flooring material in the gap between the bottom surface of the sword girder and the floor surface, and then insert the positioning receiving material in the recess of the sag girder, The construction method of the house using the strip staircase characterized by fixing the sasara girder together with the receiving material for positioning to the floor surface. Sagittal girders installed diagonally across the upper and lower floors, corrugated plate support members provided at predetermined intervals in the longitudinal direction of the corrugated girders, and a plurality of support plates respectively supported by these corrugated plate support members In strip stairs composed mainly of corrugated boards,
The floor of the lower floor is provided with a receiving member for positioning the girder, and a concave portion is formed on the lower surface of the girder so that the receiving material can be accommodated, and the receiving material is fitted into the concave portion of the girder. It is a structure to assemble a sasara girder,
The height of the receiving material is set such that a gap corresponding to the thickness of the flooring material is provided between the lower surface of the shearing girder and the floor surface when the receiving material is fitted into the recess of the sagittal girder. The strip staircase mounting structure.

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