JP6031354B2 - Sasara girder fixing bracket, sasara girder, sasara girder staircase structure and sasara girder staircase construction method - Google Patents

Description

The present invention relates to a fixing bracket for fixing the upper end of a shearing girder to a wall surface, a shearing girder used together with the fixing bracket, a stirrer staircase structure using the fixing bracket, and a method for constructing a stirrer girder.

As a kind of staircase to be constructed in a building such as a house, a pair of right and left saddle girders provided in a skewed manner between the floor and the wall is omitted, and a plurality of treads installed above these girders There are some things (called open stairs). Such stairs give a simple and modern impression, and there is an increasing demand for such a design and interior that matches an open living room with an open space. An example of this kind of staircase is shown in Patent Document 1, in which the upper end of the spar is fixed to the upper structure and the lower end is fixed to the lower structure, and the spar is installed. The metal fitting 5 for fixing the upper end of the spar to the upper structure is inserted into a piece fixed to the front of the upper structure and a slit 41 carved to halve the plate thickness at the upper end of the spar. By fitting a pin provided at the upper end of the spar girder into a notch groove 52 formed above the slit insertion piece, the upper end of the spar girder is in relation to the upper structure 1. Positioned. Similarly, the lower end of the spar is positioned with respect to the downstairs structure 2.

Japanese Patent Laid-Open No. 10-238049

The connection fitting 5 used in the prior art described in Patent Document 1 is concealed by inserting the slit insertion piece into the slit 41 of the spar girder, but on the front surface of the upper structure 1 and the upper surface of the lower structure 2. Since the piece to be fixed is exposed outside or inside the spar (see FIGS. 2 and 4), the appearance is poor.

In addition, when the upper end of the spar is attached to the upper structure 1, in order to fit the pin provided on the top of the spar in the notch 52, the upper end of the spar is once more than the front upper edge of the slit insertion piece. It is necessary to drop the pin into the notch 52 after lifting upward. Furthermore, when inserting the slit insertion piece into the thin slit 41, there is no guide for positioning in the front-rear direction, so that the slit 41 is manually aligned with the position of the slit insertion piece, particularly at the upper end of the girders. It is not easy. Due to these, construction is difficult.

Therefore, the problem to be solved by the present invention is to obtain a sagittal staircase structure that can easily perform the work of fixing the upper end of the sagittal girder to the wall surface and has a good appearance.

In order to solve this problem, the present invention according to claim 1 is a fixing metal fitting for fixing the upper end of the stair cage girder to the wall surface, and includes a wall fixing piece fixed to the wall surface and a side surface of the girder beam. A girder fixing piece to be fixed and a slit insertion piece to be inserted into a slit formed from the inner side surface toward the outer side surface on the vertical upper end surface of the spar girder are provided.

According to a second aspect of the present invention, there is provided a step staircase whose upper end is fixed to the wall surface via a fixing bracket provided with a wall fixing piece fixed to the wall surface and a girder fixing piece fixed to the inner surface of the girder. It is a girder and is characterized in that a slit insertion piece of a fixing metal can be inserted into a slit formed in the vertical upper end surface from the inner surface to the outer surface.

According to a third aspect of the present invention, in the sheathing girder according to the second aspect, the wall-fixing piece of the fixing bracket is accommodated in the wall-fixing piece-receiving recess formed in advance on the vertical upper end surface of the wetting beam. .

According to a fourth aspect of the present invention, there is provided a staircase structure in which the upper end of the sheathing girder according to the second or third aspect is fixed to a wall surface using the fixing bracket according to the first aspect. The fixing bracket is fixed to the wall surface by hitting a screw at a predetermined position on the wall surface, and the slit insertion piece protruding from the fixing bracket fixed to the wall surface is inserted into the horizontal slit of the further beam and protrudes from the fixing bracket. The girder fixing piece is fixed to the wall surface via a fixing bracket by driving a screw with the girder fixing piece placed on the side surface of the girder.

The present invention according to claim 5 is a staircase construction method for fixing the upper end of the scabbard according to claim 2 or 3 to a wall surface using the fixing bracket according to claim 1, wherein the wall fixing piece of the fixing bracket is attached to the wall fixing piece. The fixing bracket is fixed to the wall surface by hitting a screw at a predetermined position on the wall surface, the girder fixing piece protruding from the fixing bracket fixed to the wall surface is applied to the side surface of the vertical beam, and the slit insertion piece is Temporarily fixing the upper end of the shearing girder to the wall surface by inserting it into the slit, deciding the floor surface fixing position of the lower end of the temporarily fixed shearing girder, and then temporarily removing the temporarily fixed sagging girder, A lower end fixing bracket that fixes the lower end of the saddle beam in a fixed position is fixed to the floor surface, and the upper end of the once removed sagittal beam is fixed to the upper end fixing bracket that is fixed to the wall surface, and the lower end is fixed to the floor surface. Fixed Characterized in that fixed to the jig.

According to the present invention, when temporarily fixing and permanently fixing the upper end of the spar girder to the wall surface, the girder fixing piece protruding from the fixing bracket fixed to a predetermined position on the wall surface is accommodated in the inner side surface of the spar girder upper end (or the girder fixing piece accommodation). The upper end of the shearing girder can be attached to the wall surface by inserting the slit insertion piece into the horizontal slit at the upper end of the sagittal girder while positioning in the left-right direction by placing it on the concave part). Even if it is not fixed with a screw, it is possible to determine the mounting position of the further girder, and there is an effect that the construction can be easily performed.

Also, the girder fixing piece of the fixing bracket is fixed to the inner surface of the shearing girder, the wall fixing piece is sandwiched and fixed between the vertical upper end surface of the sagging girder and the wall surface, and the slit insertion piece has the thickness of the sacrificial girder. Since it is inserted into a horizontal slit that does not penetrate, the fixing bracket and fixing screw are not exposed on the outer surface of the spar, and there is an effect that a stunning staircase structure can be obtained.

FIG. 3 is a front view of a saddle girder staircase structure (a tread is not shown) according to an embodiment of the present invention. They are a front view (a), a top view (b), and a left side view (c) of an upper end fixing bracket used for fixing the upper end of the spar girder to the wall surface in this staircase structure. It is the front view (a), top view (b), and left side view (c) of the lower end fixing metal fitting used in this staircase structure to fix the lower end of the saddle girder to the floor surface. They are a front view (a), a left side view (b), and a right side view (c) of the upper end of the spar. It is a top view (d), a bottom view (e), and a rear view (f) of the upper end of the spar. They are a plan view (a), a front view (b), a left side view (c), and a right side view (d) of the lower end of the spar. They are a bottom view (e) and a rear view (f) of the lower end of the spar. It is explanatory drawing which shows the rough girder construction in case there exists a wall surface (wall foundation | substrate) under the stairs in work process order (a)-(c). It is explanatory drawing which shows the operation | work process (d) performed following FIG.8 (c). It is explanatory drawing which shows the operation | work process (e)-(f) performed following FIG.9 (d). It is explanatory drawing which shows the roughing girder construction in case there is no wall surface (wall foundation | substrate) below the stairs in work process order (a)-(c). It is explanatory drawing which shows the operation | work process (e) performed following FIG.11 (c). It is explanatory drawing which shows the work process (e)-(f) performed following FIG.12 (d).

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view of a stepped girder structure according to an embodiment of the present invention. This sasara girder staircase structure 10 includes a pair of left and right provided between the floor surface 11 and the wall surface 13 between the floor surface 11 of the lower floor (first floor) and the floor surface 12 of the upper floor (second floor). The spar 14 and 14 and a plurality of treads 15 (Fig. 10 (f)) installed between the spar 14 and 14 are arranged horizontally. It is fixed to the wall surface 13 (FIG. 8C), and the lower end is fixed to the floor surface 11 via the lower end fixing bracket 20. In FIG. 1, the upper end fixing bracket, the lower end fixing bracket, and the screws related to these brackets are shown by solid lines in order to clearly show the fixing structure of the upper and lower ends of the spar girder. It is hidden behind the spar 14 or within the plate thickness and is not visible in front view.

Referring to FIG. 2, the upper end fixing bracket 20 used for fixing the vertical upper end surface 141 of the spar 14 to the wall surface 13 includes a wall fixing piece 21 fixed to the wall surface 13 and an inner side surface 142 of the spar 14. A girder fixing piece 22 to be fixed and a slit insertion piece 23 to be inserted into a horizontal slit 144 (described later) of the spar 14 are provided. The wall fixing piece 21 is a thin flat plate having a rectangular shape when viewed from the front, and has a screw hole (not shown) through which a screw 24 for fixing the upper end fixing bracket 20 to the wall surface 13 is inserted. The girder fixing piece 22 is bent at a right angle from one side surface extending in the longitudinal direction of the wall fixing piece 21, and a screw 25 is driven in from the inner side surface 142 of the spar 14 to fix the upper end of the spar 14 (fixed to the wall surface 13. And a screw hole (not shown) for fixing to the upper end fixing bracket 20. The slit insertion piece 23 is orthogonal to the wall fixing piece 21 and the girder fixing piece 22.

In the illustrated embodiment, the girder fixing piece 22 is formed in a substantially rectangular shape having a length that slightly protrudes downward from the substantially middle portion in the longitudinal direction of the wall fixing piece 21 beyond its lower end. The shape is merely an example, and is not particularly limited as long as it can be firmly fixed to the spar 14 and fits within the range of the inner surface 142 without protruding from the inclined upper surface 145 of the spar 14. . For example, the lower end of the girder fixing piece 22 may be substantially at the same level as the lower end of the wall fixing piece 21. The slit insertion piece 23 is formed at a position where the girder fixing piece 22 can enter the horizontal slit 144 of the spar 14 when the girder fixing piece 22 is fixed to the inner side surface 142 of the top of the spar 14 and fits in the horizontal slit 144. It has a plane dimension that can be In the illustrated embodiment, the lower end of the wall fixing piece 21 is bent at a right angle to form the slit insertion piece 23, but this is only an example, and other shapes and positional relationships are adopted as long as the above conditions are satisfied. Also good.

The material of the upper end fixing bracket 20 is preferably made of metal such as stainless steel, aluminum, galvanized steel sheet, painted steel sheet, painted plated steel sheet, brass plated steel sheet, casting, etc. in terms of physical properties such as strength, but is not limited thereto. It is not something. Note that the upper end fixing bracket 20 shown in FIG. 2 is used for the counter spar 14 on the left side when viewed from the front, and the upper end fixing bracket 20 used for the counter spar 14 on the right side when viewed from the front is symmetrical in shape and structure. Are used (see FIG. 1).

Referring to FIG. 3, a lower end fixing bracket 30 used for fixing the horizontal lower end surface 146 of the sheathing girder 14 to the floor surface 11 extends to the floor fixing piece 31 fixed to the floor surface 11 and its longitudinal direction. It is an L-shaped metal fitting having a girder fixing piece 32 bent at a right angle from one side. The floor fixing piece 31 has a screw hole (not shown) through which a screw 33 for fixing the lower end fixing bracket 30 to the floor surface 11 is inserted, and the girder fixing piece 32 is screwed from the inner side surface 142 of the sheathing girder 14. And a screw hole (not shown) for fixing the lower end of the spar 14 to the lower end fixing bracket 30 (fixed to the floor 11). Similar to the upper end fixing bracket 20 for fixing the wall, the lower end fixing bracket 30 is made of metal such as stainless steel, aluminum, galvanized steel sheet, painted steel sheet, painted plated steel sheet, brass plated steel sheet, casting, etc. in terms of physical properties such as strength. Although it is preferable, it is not limited to these. About the lower end fixture 30, the thing of the same shape and structure can be shared by the right and left spar 14 and 14 (refer FIG. 1).

With reference to FIG. 4 and FIG. 5, the shape of the upper end of the spar 14 will be described. A recess 40 for accommodating the wall fixing piece 21 of the upper end fixing bracket 20 is formed on the vertical upper end surface 141 of the spar 14 from the inner side surface 142, and formed on the vertical upper end surface 141 on the inner side surface 142. A recess 41 for receiving the girder fixing piece 22 of the upper end fixing bracket 20 is formed from the bottom surface of the recess 40 formed. The position, shape, and size of the recess 40 are formed according to the position, shape, and size of the wall fixing piece 21 in the upper end fixing bracket 20, but in the illustrated embodiment, the inner surface covers the entire length of the vertical upper end surface 141 of the spar 14. The concave portion 40 is formed by cutting out from 142 to a width and depth substantially the same as the width and thickness of the wall fixing piece 21. The position, shape and size of the recess 41 are formed according to the position, shape and size of the girder fixing piece 22 in the upper end fixing bracket 20. Further, a horizontal slit 144 extending horizontally from the bottom surface of the recess 41 toward the outer surface 143 is formed. Since the slit insertion piece 23 of the upper end fixing bracket 20 is inserted into the horizontal slit 144 as described above, the position, shape and dimensions thereof are formed according to the position, shape and dimension of the slit insertion piece 23 in the upper end fixing bracket 20. However, it does not open to the outer surface 143 and remains within the thickness of the spar 14.

With reference to FIG. 6 and FIG. 7, the shape of the lower end of the spar 14 will be described. A recess 42 for accommodating the floor fixing piece 31 of the lower end fixing bracket 30 is formed on the horizontal lower end surface 146 of the spar 14 from the inner side surface 142, and formed on the horizontal lower end surface 146 on the inner side surface 142. A recessed portion 43 for accommodating the girder fixing piece 32 of the lower end fixing metal fitting 30 is formed from the bottom surface of the recessed portion 42 formed. The position, shape, and dimensions of the recess 42 are formed according to the position, shape, and dimension of the floor fixing piece 31 in the lower end fixing bracket 30. As is apparent from FIG. It does not open in the side surface 143 and remains within the thickness of the spar 14. Similarly, the position, shape and size of the recess 43 are determined according to the position, shape and size of the girder fixing piece 32 in the lower end fixing bracket 30.

The construction of the sasara girder staircase structure 10 will be described. As described above, the spar 14 is constructed in a slanting manner between the wall surface 13 and the floor surface 11, but there is a case where there is a wall below the stairs and an opening where no wall is formed below the stairs. There are cases of structure. The staircase construction in the former case is shown in FIGS. The wall surface 13 is constructed by applying a gypsum board 17 as a wall base material to a structural housing 16 such as a column or a beam, and applying a cross tension finish (not shown) thereon. It is formed continuously from the upper ridge 18 that is applied to the second floor 12 and the first floor 11.

The wall fixing piece 21 of the upper end fixing bracket 20 is applied to the upper end of the wall surface 13 and fixed with screws 24 (FIGS. 8A and 8B). The fixing position of the upper end fixing bracket 20 is determined by reading the distance from the side wall surface and the height from the first floor surface 11 from the design drawing, and determining the position at the site. In the figure, only one spar 14 is shown, but as already described with reference to FIG. 1, the spar 14 is used in a pair of left and right, so that the upper ends of the pair of spar 14 and 14 are fixed. The upper end fixing brackets 20 and 20 are fixed to the same height position of the upper end of the wall surface 13 at a predetermined interval. The upper end fixing bracket 20 fixed to the wall surface 13 in this way protrudes forward from the wall surface 13 at a position where the girder fixing piece 22 abuts on the inner side surface 142 of each spar 14, and the slit insertion piece 23 is each slat. It protrudes forward from the wall surface 13 at a position where it is inserted into the horizontal slit 144 of the beam 14.

Next, as described above, the counter girder 14 whose upper end and lower end are machined is prepared, and the slit insertion piece 23 protruding from the upper end fixing bracket 20 fixed to the wall surface 13 is used as the horizontal slit 144 at the upper end of the counter girder 14. At the same time, the protruding girder fixing piece 22 is similarly inserted into the recess 41 formed on the inner side surface 142 of the sheathing girder 14, and finally the wall fixing piece 21 of the upper end fixing bracket 20 is vertically above the weir 14. A state of being sandwiched between the bottom surface of the recess 40 formed on the end surface 141 and the wall surface 13 is obtained (FIGS. 8B and 8C). At this time, the spar 14 is not screw-fixed, but since the horizontal slit 144 is inserted into the slit insertion piece 23 of the upper-end fixing bracket 20, the upper end is temporarily fixed to the wall surface 13. Further, the horizontal lower end surface 146 of the sheathing girder 14 is substantially in contact with the first floor surface 11.

Next, the floor fixing piece 31 of the lower end fixing bracket 30 is inserted between the bottom surface of the concave portion 42 formed on the horizontal lower end surface 146 of the sheathing girder 14 and the first floor 11 and finally the lower end fixing bracket. The thirty girder fixing pieces 32 are completely accommodated in the recesses 43 formed on the inner side surface 142 of the further girder 14 (FIG. 9D). As a result, the fixing position of the lower end fixing bracket 30 is determined, and this position is marked on the floor surface 11.

Next, the girder 14 temporarily fixed to the wall surface 13 is once removed, and the floor fixing piece 31 of the lower end fixing bracket 30 is placed at the position where the ink is drawn on the floor surface 11, and its screw hole (not shown). Then, the lower end fixing bracket 30 is fixed to the floor surface 11 by driving a screw 33 into the floor (FIG. 10E). As described above, since the spar 14 is not screw-fixed to the wall surface 13 at this time, it can be easily removed by moving it away from the wall surface 13 and pulling out the slit insertion piece 23 from the horizontal slit 144. .

Next, the upper end of the shearing girder 14 is fixed to the upper end fixing bracket 20 fixed at a predetermined position of the wall surface 13 with a screw 25, and further, the lower end fixing bracket 30 fixed to the predetermined position of the floor surface 11 is fixed to the lower end fixing bracket 30. The lower end is fixed with a screw 34. The upper end of the spar 14 is fixed to the upper end fixing bracket 20 in the same manner as the temporary fixing, and then the screw 25 is inserted from a screw hole (not shown) of the spar fixing piece 22 to the inner side surface 142 of the spar 14. The bottom end of the spar 14 is fixed to the bottom end fixing bracket 30 in the same manner as in the case of inking, and then from a screw hole (not shown) of the spar fixing piece 32. The screw 34 can be fixed by driving it into the inner surface 142 of the spar 14.

In this way, after the pair of spar 14 and 14 are installed in a slanting manner between the wall surface 13 and the floor 11 at a predetermined interval, the spar 14 is placed at a predetermined position via the tread fixing bracket 18. The tread plate 15 is fixed, and the construction of the spar girder staircase structure 10 is completed (FIG. 10F).

Stair construction in the case of an open structure in which no wall is formed below the stairs is shown in FIGS. As described above, the wall surface 13 is constructed by forming a gypsum board 17 as a wall base material on a structural housing 16 such as a column or a beam, and applying a cross tension finish (not shown) thereon. A space 19 is formed below the structural housing 16.

In this case, it is preferable that the upper end of the spar 14 is notched and processed so as to give an L-shaped notch 148 between the vertical upper end surface 141 and the horizontal upper end surface 147 (FIG. 11B). . As a result, the vertical upper end surface 141 is brought into contact with the wall surface 13, the horizontal upper end surface 147 is brought into contact with the lower surface of the wall base, and the upper end of the spar 14 is placed in a state where the lower corner portion of the wall base is accommodated in the notch 148. Since it can be fixed, a stunning staircase structure can be obtained. Except for the construction related to the upper end shape of the sheath beam 14, the construction can be performed in the same manner as when no wall is formed below the stairs. In summary, the upper end fixing bracket 20 is positioned and fixed to the upper end of the wall surface 13 with screws 24 (FIGS. 11A and 11B). The upper end is positioned (FIGS. 11 (b) and 11 (c)), and in this state, the lower end fixing bracket 30 is inserted into the lower end of the further spar 14 to position and mark the fixing position on the floor surface 11 (FIG. 12 ( d)) After temporarily removing the temporarily fixed girder 14, the lower end fixing bracket 30 is fixed to the position where the floor surface 11 is marked with screws 33 (FIG. 13 (e)). After the pair of spar 14 and 14 is constructed by fixing the upper and lower ends of the spar 14 with the screws 25 and 34 respectively to the upper end fixing bracket 20 and the lower end fixing bracket 30 fixed in this way, Through which the tread plate 15 is fixed Construction of further digits step structure 10 is completed (FIG. 13 (f)).

The sagittal girder staircase structure 10 constructed in this way is either when the wall surface 13 continues to the floor surface 11 (FIGS. 8 to 10) or when it is not an open structure (FIGS. 11 to 13). In addition, when temporarily fixing and permanently fixing the upper end of the sheathing girder 14 to the wall surface 13, the girder fixing piece 22 protruding from the upper end fixing bracket 20 fixed to a predetermined position of the wall surface 13 is attached to the inner side surface 142 (or the upper end of the sheathing beam 14 (or The positioning girder 14 can be attached by inserting the slit insertion piece 23 into the horizontal slit 144 at the upper end of the stroking girder 14 while positioning in the left-right direction by being applied to the recess 41). The mounting position of the spar 14 can be determined without fixing the spar 14 with screws, and the construction is easy.

Further, the girder fixing piece 22 of the upper end fixing bracket 20 is screw-fixed to the inner side surface 142 of the cage girder 14, and the wall fixing piece 21 is accommodated in the recess 40 that does not reach the outer side surface 143 of the cage girder 14. Since the slit insertion piece 23 is inserted into the horizontal slit 144 that does not penetrate the plate thickness of the spar 14, the upper end fixing bracket 20 and the screws 24, 25 are not exposed on the outer surface 143 of the spar 14. A good-looking staircase structure 10 can be obtained.

According to the illustrated embodiment, the lower end fixing bracket 30 is also fixed in a state where it is accommodated in the recesses 42 and 43 formed on the inner side surface 142 and the horizontal lower end surface 146 of the counter beam 14. The lower end fixing bracket 30 and the screws 33 and 34 are not exposed on the outer side surface 143, and the appearance is good.

Although the present invention has been described in detail with reference to the illustrated embodiments, the present invention is not limited to this, and can be implemented with any modifications within the scope of the invention described in the claims. For example, a screw 24 for fixing the upper end fixing bracket 20 to the wall surface 13, a screw 25 for fixing the upper end of the counter girder 14 to the upper end fixing bracket 20, a screw 33 for fixing the lower end fixing bracket 30 to the floor surface 11, and the counter girder 14. Any of the screws 34 for fixing the lower end to the lower end fixing bracket 30 can be used by appropriately selecting the number and type thereof. The number and shape of the screw holes formed in the wall fixing piece 21 and the girder fixing piece 22 of the upper end fixing bracket 20 and the floor fixing piece 31 and the girder fixing piece 32 of the lower end fixing bracket 30 in order to allow these screws to pass therethrough are also particularly. Although it is not limited, it is preferable that the screw head is dished so that the heads of the screws are flush with the surfaces of these pieces when the screws are driven through the screw holes.

Further, the wall fixing piece 21, the girder fixing piece 22 and the slit insertion piece 23 constituting the upper end fixing metal fitting 20 only have to be orthogonal to each other. In the illustrated embodiment, these three pieces are connected and integrated. However, there may be a gap between them. For example, the wall fixing piece 21 and the girder fixing piece 22 are connected to each other, but there may be a configuration in which there is a gap between the girder fixing piece 22 and the slit insertion piece 23.

Further, in the illustrated embodiment, a concave portion 41 for accommodating the girder fixing piece 22 of the upper end fixing bracket 20 and a concave portion 43 for accommodating the girder fixing piece 32 of the lower end fixing bracket 30 are formed on the inner surface 142 of the spar 14. However, these recesses 41 and 43 are not essential to the present invention. However, by providing these recesses 41 and 43, when the spar 14 is fitted into the upper end fixing bracket 20 fixed to the wall surface 13 and the lower end fixing bracket 30 fixed to the floor surface 11 during construction, 14 can reliably position the upper end fixing bracket 20 in the front-rear direction, and the work of fixing the girder fixing piece 22 of the upper end fixing bracket 20 and the girder fixing piece 32 of the lower end fixing bracket 30 to the inner side surface 142 of the further girder is easy. This is a preferred embodiment. Furthermore, when the girder fixing piece 22 of the upper end fixing bracket 20 is accommodated in the recess 41, the girder fixing piece 22 is flush with the inner side surface 142 of the further girder, and similarly, the girder fixing of the lower end fixing bracket 30 is fixed to the recess 43. Since the girder fixing piece 32 is flush with the inner side surface 142 of the girder when the piece 32 is accommodated, there is an advantage that it is not conspicuous when viewed from the inside of the stairs and the appearance is good.

10 Sasara girder staircase structure 11 Lower floor (1st floor) Floor 12 Upper floor (2nd floor)
13 Wall surface 14 Sasara gird 141 Vertical upper end surface 142 Inner side surface 143 Outer side surface 144 Horizontal slit 145 Inclined upper surface 146 Horizontal lower end surface 147 Horizontal upper end surface 148 Notch 15 Fixing bracket of the present invention)
21 Wall fixing pieces 22 Girder fixing pieces 23 Slit insertion pieces 24 Screws 25 Screws 30 Lower end fixing brackets 31 Floor fixing pieces 32 Girder fixing pieces 33 Screws 34 Screws 40
41 Sasara Girder Recess (Recess for storing the girder fixing piece of the top fixing bracket)
42 Recessed part of the saddle girder (recessed part that holds the floor fixing piece of the lower end fixing bracket)
43 Sasara girder recess (recess for holding the girder fixing piece of the lower end fixing bracket)

Claims (5)

Fixing brackets for fixing the top end of the stirrer girder to the wall, and are fixed to the wall fixing piece fixed to the wall surface, the girder fixing piece fixed to the side of the rafter girder, and the vertical upper end surface of the rafter girder. A fixing bracket comprising a slit insertion piece to be inserted into a slit formed from a side surface toward an outer surface. A stair cage girder whose upper end is secured to the wall surface via a fixing bracket that is provided with a wall fixing piece fixed to the wall surface and a girder fixing piece fixed to the side surface of the girder girder. A shearing girder characterized in that a slit insertion piece of a fixture can be inserted into a slit formed from a side surface toward an outer surface. 3. The shearing girder according to claim 2, wherein the wall fixing piece of the fixing bracket is accommodated in a wall fixing piece accommodating recess formed in advance on the vertical upper end surface of the shearing girder. A staircase structure comprising the fixing bracket according to claim 1 fixed to the wall surface with the upper end of the sheathing girder according to claim 2 or 3, wherein the wall fixing piece of the fixing bracket is applied to a predetermined position of the wall surface to The fixing bracket is fixed to the wall surface by driving, and the slit insertion piece protruding from the fixing bracket fixed to the wall surface is inserted into the horizontal slit of the spar, and the spar fixing piece protruding from the fixing slab is placed on the side of the spar. A spar girder staircase structure, characterized in that the spar girder is fixed to the wall surface via a fixing bracket by hitting a screw. A staircase construction method for fixing the upper end of the scabbard according to claim 2 to a wall surface by using the fixing bracket according to claim 1, wherein a wall fixing piece of the fixing bracket is applied to a predetermined position of the wall surface to The fixing bracket is fixed to the wall surface by driving, and the girder fixing piece protruding from the fixing bracket fixed to the wall surface is applied to the side surface of the vertical beam and the slit insertion piece is inserted into the slit of the vertical beam. Temporarily fix the upper end to the wall, determine the floor surface fixing position of the lower end of the temporarily fixed sheathing girder, and then temporarily remove the temporarily fixed sheathing girder and fix the lower end of the shearing beam at the floor surface fixing position. Fixing the lower end fixing bracket to the floor surface, fixing the upper end of the once removed girder to the upper end fixing bracket fixed to the wall surface, and fixing the lower end to the lower end fixing bracket fixed to the floor surface. Sasara digit stairs construction method to be.