JP6568966B2 - Around staircase and its construction method - Google Patents

Description

  The present invention relates to a circuit staircase and a construction method therefor, and more particularly to a circuit staircase having eight steps.

  Conventionally, it is generally well-known that in a staircase where upper and lower straight stairs are connected in a folded shape, a plurality of treads are arranged radially at the connecting part of the upper and lower straight stairs (corresponding to a landing). As the surrounding stairs, for example, 4-step or 6-step treads are constructed to turn back 180 ° between the upper and lower straight stairs. However, in such a four-step or six-step tread, the height of each step (kick-up dimension) becomes high, and accordingly, attention is required for ascending and descending. Therefore, an eight-step tread is provided for folding back 180 °. Eight stairs are drawing attention. In other words, when turning 180 degrees with an 8-step tread, the height of each step is lower than that of the 4th and 6th steps, and it is possible to go up and down with a small width, which makes it easier to use, especially in houses where elderly people and infants live. .

  However, on the other hand, since the 8-step treads are equally divided into the range of 180 °, the width of the treads of each tread becomes small, which may violate the Building Standard Law. According to the Building Standard Law, the width of the tread on the step stairs is about 300 mm from the narrow side (inside of the step) at the nose position of each tread and the same position of the adjacent next step tread. The length of the connected straight line is said, and the legal value is 150 mm or more.

  In order to solve this problem, as shown in, for example, Patent Document 1 and Patent Document 2, in the past, when constructing around an even number of steps (for example, six steps) around a core column located inside the stairs, With respect to the center position of the upper and lower steps of the surrounding staircase, each nose position is on the lower side of each step board, and on the opposite side of each nose position on each of the upper step boards. It has been proposed that the width dimension of the tread surface of each tread plate is set to 150 mm or more by shifting the end portions to the upper side little by little.

Japanese Patent No. 3948613 JP2015-34438A

  However, in the above-mentioned conventional one, the positions of the plurality of treads are shifted little by little, so that the amount of shift in each of the bottom and top steps of the treads is excessive due to the accumulation of the shift amounts of the other steps. Therefore, it is unavoidable that the bottom and top treads are displaced to the position of the straight staircase connected to the surrounding staircase, and the width of the tread surface of the straight staircase is narrowed under the influence of the deviation. Absent.

  In addition, in the staircase, each tread is constructed so that the straight line along the end (tip) on the nose side passes through the core position of the core column, but if the tread is displaced as described above, The tread board cannot be constructed so as to pass through the core position of the core pillar, and the shift of the core requires troublesome work at the construction site, which increases the burden.

  Unlike the 8-step staircase, the 4-step staircase that turns 90 ° by the 4-step stepboard has the lowermost first stepboard on the lower side and the uppermost fourth stepboard on the upper side. Even if they are shifted, the shift amount is small, so even if there is a problem as described above, there will not be much trouble.

The present invention has been made in view of such various points, and the object of the present invention is to improve the structure of the eight-step staircase, thereby reducing the amount of shift in the bottom and top steps of the eight-step staircase. small comb, is to improve the workability at the construction site.

  In order to achieve the above object, in the present invention, focusing on the core pillar inside the surrounding staircase, another board is stacked on the interior base material fixed to the core pillar to form a two-layer structure, The position where the width dimension of the tread surface of the tread is measured is shifted outward by the two-layer structure.

  Specifically, according to a first aspect of the present invention, there is provided a core column having two opposing side surfaces facing each other and one intermediate side surface located between the two opposing side surfaces on the outer periphery. The interior base material is fixed, and eight treads from the first stage to the eighth stage, which increase in order from the lower stage to the upper stage, around the opposing side face and the intermediate side face of the core pillar, are spaced at predetermined angular intervals. The target is a staircase that is constructed over a 180 ° angle range.

The laminated board is overlaid on the interior base material on the intermediate side surface of the core pillar so as to form a double pasted structure with the interior base material, and the first step tread is a nose portion of the tread The two steps of the second step and the eighth step so that the straight line along the end of the side passes through the first shift position shifted from the core position of the core column to the opposite side of the intermediate side surface. second shift position located between the deviation in the intermediate side surface opposite and core position and the first shift position than the core position of the nosing section side of the end portion on a straight line along Kishinbashira each step board while being respectively construction to pass, the other five treadle, the straight line along the edge portion of the nosing section side of the respective step boards are construction so as to pass through the core position of the core column It is characterized by. Incidentally, The "straight line along the edge of the nosing section side", the details will be meaning taste straight line extending along the end portion on the end portion of the nosing section side.

In the first aspect of the invention, the interior base material is fixed to the opposite side surface and the intermediate side surface of the inner core pillar in the eight-step staircase. The material has a double-ply structure. Then, the single step board of the first step passes through the first shift position where the straight line along the end portion of each step board on the nose side is shifted to the opposite side to the intermediate side surface from the core position of the core column. In addition, the two step plates of the second step and the eighth step are such that the straight line along the nose portion side end of each step plate is shifted to the opposite side to the intermediate side surface from the core position of the core column and are construction are staggered respectively core so as to pass through the second shift position is located between one shift position, five treadle of the third stage to seventh stage, the end of the nosing section side of the respective step boards It is construction without along straight lines are staggered core so as to pass through the core position of the core pole, with this, only stacking laminated board superimposed only interior base material and is fixed to the intermediate side surface of the core pole The width dimension of the tread surface of each tread determined by the Building Standards Act can be 150 mm or more.

Further, among the eight stages treadle first stage, it is only necessary to shift three core only treadle second Dan及 beauty eighth stage, compared with the case of shifting the core of eight stages every step boards, most The stacking of the shift amount of the first step board at the lower stage and the eighth step board at the uppermost stage is reduced, so that there is no significant shift to the position of the straight staircase connected to the surrounding staircase. The width of the tread surface can be increased.

Furthermore, to shift the core of the eight stages treadle first stage, only three step plate of the second Dan及 beauty eighth stage, the other five tread plate along the edge of the nosing section side since the straight line is the construction so as to pass through the core position of the core columns, it is possible to reduce the tedious work on the construction site, it is possible to reduce the burden. In addition, it is only necessary to overlap and paste the overlapping board only on the interior base material on the intermediate side surface of the core column to form a double-bonding structure, and the work burden at the construction site can be further reduced .

A second invention is characterized in that, in the first invention, the overlapped board has the same thickness as the interior base material.

A third invention is the first or second inventions in Oite overlaid laminated board, characterized by comprising the same material as the interior base material.

In this 2nd or 3rd invention, since the thing of the same thickness or the same material as an interior base material is used as a laminated board, construction becomes still easier.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a position of 300 mm from the inner end of the tread at the nose portion side end of each tread and an upper tread adjacent to the tread The distance from the inner end portion of the tread board at the nose portion side end portion to a position of 300 mm is 150 mm or more.

In the fourth aspect of the present invention, the position of 300 mm from the inner end of the step board at the nose side end of each step board and the position of 300 mm from the inner end of the step board at the end of the upper step board Since the distance between them, that is, the width of the tread surface defined by the Building Standards Act is 150 mm or more, it is possible to easily construct the surrounding stairs that satisfy the same method.

5th invention is the method of constructing the surrounding staircase of any one of 1st- 4th invention, and this method fixes an interior base material to a core pillar, and laminates on the interior base material. After the board is overlapped and fixed with the interior base material so as to have a double-bonding structure, each tread is constructed around the core pillar. In the fifth aspect , the above-mentioned surrounding stairs can be easily constructed.

As described above, according to the present invention, a double-ply structure is formed by superimposing a double-ply board on the interior base material of only the intermediate side surface of the core column located inside the surrounding staircase, and the intermediate five-step tread is used as each tread. in a straight line along the edge portion of the nosing section side of by the construction so as to pass through the core position of the core pole, just put on top of the bonded boards superimposed on interior base material is fixed to the side surface of the core pole, the width of the tread surface of each step board specified by building codes can be at least 150 mm, and small comb pile of shift amount in accordance with another step board for the bottom and top of the tread plate, straight connected around staircase The width of the tread surface can be increased. In addition, by reducing the tedious task of shifting core at the construction site, it is possible to reduce the burden.

Figure 1 is a plan view of around staircase according to an exemplary shape condition of the present invention. Figure 2 is a schematic perspective view of around staircase according to the exemplary shape state. FIG. 3 is an enlarged plan view showing a peripheral portion of the core column. FIG. 4 is a view corresponding to FIG. 1 showing the surrounding staircase according to the reference embodiment . Figure 5 is a diagram 2 equivalent diagram of the around stairs according to a reference embodiment. Figure 6 is a 3 corresponds diagram showing a reference embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the embodiments is merely illustrative in nature and is not intended to limit the present invention, its application, or its use at all.

(Working-shaped state)
1 and 2 show a around stair S according to the embodiment forms state of the present invention, this around stair S is left around up to be construction in upper and lower floors of the middle part of the building rises as viewed from the upper side in the counterclockwise direction It is a staircase. In the description, the side on which the lowermost step and the uppermost step are located in the staircase S is the front, the opposite side is the rear, and the left and right are the left and right sides of the state viewed from the front side.

  The rotating staircase S has a core column 1 located at the center inside the rotating direction, and two front columns 2, 2 are spaced apart from the core column 1 on both the left and right sides of the core column 1. (For example, 910 mm) is erected so as to line up in series. Further, three rear pillars 3, 3,... Are arranged in a position directly behind the core pillar 1 and the left and right front pillars 2, 2 so that they are arranged in series with a certain interval (for example, 910 mm) in the left-right direction. It is installed. That is, the core pillar 1 and the left and right front pillars 2, 2 and the rear pillars 3, 3,... Are in positions corresponding to the front and rear, respectively, and their front-rear spacing is between the core pillar 1 and the front pillar 2, and It is made the same (for example, 910 mm) as the space | interval of the left-right direction between back pillars 3, 3, .... A portion surrounded by these six pillars 1 to 3 is a step space having a rectangular cross section. Each of the core pillar 1, each front pillar 2, and each rear pillar 3 is, for example, a tubular pillar having a square cross section with a side of 105 mm.

  The core pillar 1 has, on its outer periphery, left and right side surfaces 1a and 1b facing each other in the left and right direction, and front and back side surfaces 1c and 1d facing each other in the front and rear direction, of which the left and right side surfaces 1a and 1b are 2 of the present invention. The two opposite side surfaces and the rear side surface 1d similarly constitute one intermediate side surface. The rear side surface 1d is continuous with the left and right side surfaces 1a and 1b and is opposed to the left and right side surfaces 1a and 1b (left and right direction). ).

  Panel plate-like interior base materials 7 and 7 extending in parallel in the front-rear direction are attached and fixed to the left and right side surfaces 1a and 1b of the core pillar 1 with screws or the like at the rear end. Also, on the rear side surface 1d of the core post 1, an interior base material 8 elongated vertically is attached and fixed with screws or the like, and these interior base materials 7 and 8 are made of a plate material such as a plaster board having a thickness of 15 mm, for example. Specifically, for example, the interior base materials 7 and 7 are fixed to the left and right side surfaces 1 a and 1 b of the core column 1 so that the rear end surfaces thereof are flush with the rear side surface 1 d of the core column 1. On the other hand, the interior base material 8 has a left-right width obtained by combining the left and right widths of the rear side surface 1d of the core column 1 and the thickness of the interior base materials 7 and 7, and the rear side surface 1d of the core column 1 and the interior base material 7 , 7 is fixed to the rear side surface 1d of the core column 1 in a state of covering the rear end surface from the rear side, and its left and right end surfaces are flush with the surface on the opposite side of the core column 1 in the interior base materials 7 and 7. .

  On the left side of the front pillar 2 and the rear pillar 3 positioned on the right side, a right wall base material 11 made of a gypsum board or the like extending in the front-rear direction between the pillars 2 and 3 is disposed. This right side wall base material 11 forms the right wall part of the surrounding staircase S, and is fixed to the left side surfaces of both pillars 2 and 3 with screws or the like, for example. Further, a rear side wall base material 12 made of a gypsum board or the like extending in the left-right direction is disposed between the three pillars 3, 3,. . The rear side wall base material 12 forms a rear wall portion of the staircase S. For example, in the state where the right end is abutted against the left surface of the right side wall base material 11, And it fixes to the front side surface of the rear pillars 3 and 3 of the center with a screw | thread etc. Further, on the right side of the front pillar 2 and the rear pillar 3 located on the left side, a left wall base material 13 made of a gypsum board or the like extending in the front-rear direction between the pillars 2 and 3 is disposed. The left side wall base material 13 forms the left wall part of the turning staircase S. For example, the left front pillar 2 in the front side part in a state where the rear end is abutted against the front surface of the rear side wall base material 12. It is fixed to the right side of the screw with a screw or the like.

  Around the left and right side surfaces 1a and 1b (opposite side surfaces) and the rear side surface 1d (intermediate side surface) of the core pillar 1, there are eight treads 16 in the first to eighth steps, which increase in order from the bottom to the top. 16,... Are constructed over an angular range of 180 ° in plan view with a predetermined angular interval (basically 22.5 °). In the figure, the first to eighth steps in the surrounding staircase S are indicated by circle numbers.

  The first and eighth step plates 16, 16, the second and seventh step plates 16, 16, the third and sixth step plates 16, 16, and the fourth step The fifth stage treads 16, 16 have a plane-symmetric shape that is symmetrical with respect to a vertical plane in the front-rear direction passing through the core position C (the center of the cross section) of the core column 1 in plan view. Each of these has a substantially triangular plate-like shape with the inner end corners notched in a straight line or L shape, and the outer ends abut against the wall base materials 11 to 13 and the inner ends. The cutout portion is in contact with the interior base material 7 or a lap-bonding board 35 described later. 1 is a view of the eight treads 16, 16,... Constructed as the surrounding staircase S from above, and the shape of each tread 16 is different from the actual planar shape. For example, an end portion (a position of a kick plate 18 to be described later) on the side opposite to the nose portion 16a of each tread plate 16 is the side of the nose portion 16a side of the tread plate 16 adjacent to the upper step side by an amount corresponding to “nose out” described later. It is located on the upper stage side from the end (tip) of.

.. Are fixedly supported at the outer end portion and the inner end portion in the same manner as a general rotating staircase. This fixed support structure will be described with reference to FIG. 1. A right girder 20 is disposed on the left surface of the right side wall base material 11 in a state of being fixedly supported by the right front column 2 and the rear column 3. Are formed in a stepped shape with two steps of front and rear tread plate support portions 20a and 20b that are higher on the rear side, and the outer end portion of the first step tread plate 16 is also formed on the front tread plate support portion 20a. The outer end portions of the second-stage tread plate 16 are respectively mounted and fixed to the rear tread support portion 20b higher than the support portion 20a. Further, the rear spar 21 on the front surface of the rear wall base material 12 three after pillars 3,3 are arranged in a state of being fixedly supported ... to, on the upper surface of the rear spar 21, to the left The four-step tread board support portions 21a to 21d that become higher in order are formed in a step shape, and the outer end portion of the third step tread plate 16 is formed on the right end tread plate support portion 21a, and the second tread plate support from the right side. The outer end of the fourth stage tread 16 is located on the portion 21b, the outer end of the fifth stage tread 16 is located on the third tread support 21d from the right (second from the left), and the fourth end from the right ( The outer end portions of the sixth-stage tread plate 16 are respectively mounted and fixed on the tread plate support portion 21d at the left end). Further, a left girder 22 is disposed on the right side of the left side wall base material 13 in a state of being fixedly supported by the left front column 2 and the rear column 3. The two-step tread board support portions 22a and 22b are formed in a step shape, and the rear tread plate support portion 22a has the outer end portion of the seventh step tread plate 16 and the front tread plate support higher than the tread plate support portion 22a. The outer end portions of the eighth step plate 16 are respectively placed and fixed on the portion 22b.

  On the other hand, the interior base material 7 that overlaps the right side surface 1a of the core column 1 has two upper and lower right side tread supports that have upper surfaces at the same height as the two tread plate support portions 20a and 20b of the right girder 20, respectively. The members 23 and 24 are arranged in a state where they are vertically spaced apart and fixedly supported by the core column 1, the inner end of the first step plate 16 is arranged on the upper surface of the lower step plate support member 23, and the upper step plate The inner end portions of the second step plate 16 are mounted and fixed on the upper surface of the support member 24, respectively. Further, the interior base material 8 (specifically, the overlapped board 35) that overlaps the rear side surface 1d of the core column 1 has an upper surface at the same height as the four tread plate support portions 21a to 21d of the rear beam 21. The upper and lower four rear tread support members 25 to 28 are arranged in a state where they are fixedly supported by the core pillar 1 with a space therebetween in the vertical direction, and a third step tread is disposed on the upper surface of the lowermost tread support member 25. 16, the inner end of the fourth step tread 16 on the top of the second tread support 26 from the bottom, and the top of the third tread support 27 from the bottom (second from the top) The inner end of the fifth-stage tread 16 is mounted on the upper surface of the fourth (topmost) tread support material 28 from the bottom, and the inner end of the sixth-stage tread 16 is mounted and fixed. . Further, the interior base material 7 that overlaps the left side surface 1a of the core column 1 has two upper and lower left side tread support materials having upper surfaces at the same height as the two tread plate support portions 22a and 22b of the left girder 22, respectively. 29 and 30 are arranged in a state where they are vertically supported and fixedly supported on the core column 1, and the inner end portion of the seventh step plate 16 is formed on the upper surface of the lower step plate support member 29, The inner end portions of the eighth step plate 16 are respectively placed on and fixed to the upper surface of the step plate support member 30.

  And each height position of each of the plurality of tread board support portions 20a, 20b, 21a-21d, 22a, 22b in each of the side girders 20-22 (and a plurality of tread board support members 23-30 fixed to the core column 1). By setting the height position of each upper surface) to a predetermined value, the height (kick-up dimension) between the upper and lower adjacent treads 16, 16 is set to 170 to 230 mm, for example.

  Further, as shown in FIG. 2, on the lower surface of each tread 16, a position separated from the end of the nose portion 16 a on the lower step side by a certain dimension (for example, “nose out” of 30 mm) to the upper step side, A kick plate 18 is fixed between the upper step side end portion (the end portion on the side opposite to the nose portion 16a) of the upper surface of the lower step plate 16 adjacent to the step plate 16. Although not shown in FIG. 2, the outer end of each kick plate 18 is in the vertical portion between the tread plate support portions 20 a, 20 b, 21 a to 21 d, 22 a, 22 b and the inner end portion in the side girders 20 to 22. Are fixed to the vertical portions of the tread support members 23 to 30, respectively.

  As shown by the phantom line in FIG. 1, the first stage, which is the lowest stage of the circuit staircase S, has an upper end portion of the lower straight staircase S1 that is located below the circuit staircase S and rises toward the rear side. However, the lowermost portion of the upper straight staircase S2 that is located on the upper side of the rotating staircase S and rises toward the front in parallel with the lower straight staircase S is connected to the eighth stage, which is the uppermost stage.

  Then, as a feature of the present invention, the interior base material 8 on the rear side surface 1d (intermediate side surface) of the core pillar 1 is overlapped on the interior base material 8 (the interior base material on the outside if the interior base material 8 is used as the interior base material). Are stacked with the interior base material 8 so as to form a double-bonded structure, and this overlap-bonded board 35 is fixed to the core column 1 together with the interior base material 7 with screws or the like. The overlapped board 35 is an elongated plate material having the same left-right width dimension as the interior base material 8 fixed to the rear side surface 1d of the core column 11, and the thickness thereof is the same as the interior base material 8, for example, 15 mm. Is made of the same material (such as gypsum board) as the interior base material 8. That is, in this embodiment, the overlapping board 35 is the same as the interior base material 8.

Further, as shown in FIG. 3 in an enlarged manner, the two treads 16, 16 of the first step and the second step are straight lines along the end of the step plate 16 on the side of the nose part 16 a (nosal part). A vertical plane in the front-rear direction passing through the core position C of the core pillar 1 on the end portion on the 16a side is slightly on the front side opposite to the rear side surface 1d from the core position C. The center is shifted to the lower side so as to pass through the shifted first and second shift positions C1, C2. Specifically, the straight line along the end of the first step plate 16 on the nose portion 16a side passes through the first shift position C1, and the straight line along the end portion of the second step plate 16 on the nose portion 16a side. Passes through the second displacement position C located between the core position C and the first displacement position C1.

Further, in the step board 16 of the seventh stage, but a straight line extending along the upper end of the nosing section 16a side of the tread plates 16 to the end portion passes through the core position C of the core column 1, 8 Stepping plate 1 6 stages, opposite the upper end of the nosing section 16 a side straight line extending along the end portion and the front side (the rear side 1d than the core position C of the core column 1 of each of the step board 16 ) And shifted to the upper stage side so as to pass through the second shift position C2 that is slightly shifted.

On the other hand, the third stage through sixth stage four treadle 16, 16, ... is a straight line extending over the end of the nosing section 16a side of the respective step boards 16 along the end portion of the core column 1 It is constructed so as to pass through the lead position C. That is, the five step plates 16, 16,... Of the third to seventh steps are such that the straight line extending along the end portion on the nose portion 16a side of each step plate 16 is the core position of the core column 1. It is constructed to pass C. A straight line extending along the end portion of the step board at the lower end portion of the upper straight staircase S2 along the end portion is also constructed so as to pass through the first shift position C1. In FIG. 3, the straight line along the end portion on the nose portion 16a side of each tread plate 16 and the straight line along the nose portion side end portion of the tread plate at the lower end portion of the upper straight staircase S2 are both shown by two-dot chain lines. Show.

  In this way, the eight steps of the treads 16, 16,... Are positioned 300 mm from the inner end of the tread plate 16 at the end of the step nose 16 a side of each tread plate 16, and the upper step plate adjacent to the tread plate 16. Similarly, the distance d between the inner end portion of the tread plate 16 and the position P of 300 mm is 150 mm or more (for example, 151.12 to 158.92 mm) at the end portion on the 16 nose portion 16a side.

  When the staircase S is constructed, interior base materials 7 and 8 are fixed to the left and right side surfaces 1a and 1b and the rear side surface 1d of the core column 1, respectively, and the interior base material 8 fixed to the rear side surface 1d of the core column 1 is provided. Overlaying board 35 is aligned and fixed on top, and it is made to have a double pasting structure with the interior base material 8, and then each tread board 16 is surrounded by the inner end portion around the core pillar 1. What is necessary is just to construct so that it may contact | abut to the base material 7 (8) or the lamination board 35. FIG.

Therefore, in the eight-step staircase S of the above-described embodiment, the interior base materials 7 and 8 are fixed to the left and right side surfaces 1a and 1b and the rear side surface 1d of the inner core pillar 1, and the interior base material 8 on the rear side surface 1d is included. Overlap board 35 is overlaid only on the top to form a double-paste structure with interior base material 8. And, the three step plates 16 , 16 ,... Of the first step , the second step, and the eighth step have a straight line from the core position C of the core column 1 along the nose portion 16 a side end of each step plate 16 . .. Also pass through the first and second shift positions C1, C2 which are shifted forward, and the five step plates 16, 16,... Of the third to seventh steps are end portions on the nose portion 16a side of the respective step plates 16. are respectively the construction so as to pass through the core position C of the core column 1 is a straight line along the. For this reason, in each tread board 16, the end portion on the side of the nose portion 16 a is obtained simply by superimposing the construction board 35 on only the interior base material 8 fixed to the rear side surface 1 d of the core column 1 to form a double construction structure. The width dimension of the tread surface, which is a distance d between the position P of 300 mm from the inner end portion and the position P of 300 mm from the inner end portion of the step nose portion 16a side of the upper tread plate 16, is easily set to 150 mm or more. The surrounding staircase S determined by the Building Standard Law can be easily constructed.

Further, the 8-stage step boards 16, 16, ... of the first stage, second Dan及 beauty eighth stage three treadle 16 and 16, it is only necessary to shift the core of ... only the remaining five Since the treads 16, 16,... Do not need to be misaligned, compared to the case where all the eight treads 16, 16,. The stacking of the shift amount due to the other treads 16, 16,... On the stepped tread 16 is reduced, and it does not greatly deviate to the positions of the lower and upper straight stairs S1, S2 connected to the surrounding stairs S. The amount of deviation is, for example, about 45 mm in the case of shifting all the treads 16, 16,..., For example, about half of that, and the remaining amount after shifting becomes large. A wide width of the tread surface of S2 can be secured.

Furthermore, the eight-step step boards 16, 16, ... is to shift the core of the first stage, second Dan及 beauty eighth stage three treadle 16, 16, ... is only, the other five treadle 16, 16, ... so straight line along the edge portion of the nosing section 16a side is construction so as to pass through the core position C of the core column 1, troublesome work is reduced with shifting core at the construction site , The burden is reduced. In addition, since it is only necessary to overlap and paste the overlapping board 35 only on the interior base material 8 on the rear side surface 1d of the core pillar 1, this also further increases the work load on the construction site. Can be reduced.

  Further, since the overlapping board 35 is made of the same material as the interior base material 8 such as gypsum board and the thickness thereof is the same as the interior base material 8, the same overlapping base board 35 as the interior base material 8 is used as the interior base material. 8 only needs to be aligned and pasted, and the construction becomes even easier.

( Reference form )
4 to 6 show a reference form (note that the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals and detailed description thereof is omitted), and the overlapped board disposed around the core column 1 is shown. The pasting position is increased.

That is, in the above-described embodiment, the overlapped board 35 is overlapped only on the interior base material 8 located on the rear side surface 1d of the core pillar 1 and the single-sided board with a double-bonding structure is attached to the interior base material 8. On the other hand, in this reference embodiment , the interior base material 8 is overlapped on the interior base material 8 located on the rear side surface 1d of the core pillar 1 and the interior base material 7 located on the left and right side surfaces 1a and 1b, respectively. The materials 7 and 8 are attached to a three-sided board with a double-sticking structure. Specifically, as in the embodiment , the back overlay board 35 is stacked on the interior base material 8 positioned on the rear side surface 1d of the core column 1, and the back stack board 35 is screwed together with the interior base material 7 with screws or the like. It is fixed to the core column 1. In addition, the left and right overlapping boards 36 and 36 sandwich the interior base material 8 and the rear overlapping board 35 from both the left and right sides in the width direction, respectively, on the interior base materials 7 and 7 fixed to the left and right side surfaces 1a and 1b of the core pillar 1. The left and right overlapped boards 36 and 36 are fixed to the core pillar 1 together with the interior base materials 7 and 7 so that the rear end surfaces thereof are flush with the rear surface of the rear overlapped board 35. These overlapped boards 35 and 36 are both the same material and the same thickness as the interior base materials 7 and 8.

Further, unlike the embodiment , the eight tread boards 16, 16,... Of the first to eighth stages are all straight lines (on the nose part 16a side) along the end of the tread board 16 on the nose part 16a side. The straight line extending along the end portion ) is passed through the core position C of the core column 1. Further, the inner end corners of the eight treads 16, 16,... Are all cut out in a straight line shape and are in contact with the overlapped boards 35, 36. Other configurations are the same as those of the embodiment .

In the case of this reference form , the interior base materials 7 and 8 are fixed to the rear side surface 1d and the left and right side surfaces 1a and 1b of the inner core pillar 1 in the eight-step staircase S, and are superimposed on the interior base materials 7 and 8. paste board 35 and 36 are overlapped has a double attachment structure in the interior base material 7 and 8, the first-stage, second, all of the eight 8-stage treads 16 and 16, in ..., respective treads 16 straight line along the edge portion of the nosing section 16a side is construction so as to pass through the core position C of the core column 1. Therefore, the nose portion 16a side of each tread 16 can be obtained simply by overlapping and fixing the overlapping boards 35 and 36 on the interior base materials 7 and 8 fixed to the rear side surface 1d and the left and right side surfaces 1a and 1b of the core column 1. The width dimension of the tread surface of each tread 16 is a distance d between the position P of 300 mm from the inner end of the end and the position P of 300 mm from the inner end of the upper nose 16 side end of the step nose 16a. It can be 150 mm or more.

All the step board 16, 16 eight, ..., because a straight line along the edge portion of the nosing section 16a side of the respective step boards 16 are construction so as to pass through the core position C of the core column 1, their .. Are not displaced (the amount of displacement is 0), and the width of the treads of the straight stairs S1, S2 connected to the surrounding stairs S can be ensured to be wide.

Further, since all the eight steps treads 16, 16,... Are constructed so that the straight line along the end portion on the nose portion 16 a side passes through the core position C of the core column 1, it is troublesome to shift the center at the construction site. The work is unnecessary and the burden can be reduced. Then, it is only necessary to overlap the pasting boards 35 and 36 on the interior base materials 7 and 8 on the rear side surface 1d and the left and right side surfaces 1a and 1b of the core pillar 1 to form a double pasting structure. This can be further reduced.

(Other embodiments)
In the above embodiment, the overlapped laminated board 35, and made of the same material as interior base material 8, although the same thickness as the interior base material 8, superposed laminated board 35 is of a material different interior base material 8 The thickness may be different from that of the interior base material 8 .

  In the above embodiment, the counterclockwise staircase S is raised in the counterclockwise direction when viewed from above, but the present invention is a clockwise staircase that is rotated in the clockwise direction when viewed from above. It goes without saying that can also be applied.

In the present invention, in the eight-step staircase, the width of the tread surface of each tread is set to 150 mm or more, and the shift amount of the bottom tread and the top tread is reduced to reduce the work burden on the construction site. It is extremely useful and has high industrial applicability.

S Around staircase S1 Lower straight staircase S2 Upper straight staircase 1 Core pillar C Core position C1, C2 Shift position 1a Left side (opposite side)
1b Right side (opposite side)
1d Rear side (middle side)
7, 8 Interior base material 16 Tread board 16a Nose part P Position 300mm from inner end of tread board d Distance (width dimension of tread)
35, 36 Overlay board

Claims (5)

An inner base material is fixed to each of the opposing side surfaces or the intermediate side surface in a core column having two opposing side surfaces facing each other on the outer periphery and one intermediate side surface located between the opposing side surfaces. Around the opposing side surface and the intermediate side surface, eight treads from the first stage to the eighth stage, which increase in order from the lower stage to the upper stage, are constructed over a 180 ° angle range in plan view with a predetermined angular interval. The surrounding stairs,
The laminated board is overlaid on the interior base material on the intermediate side surface of the core pillar so as to have a double pasted structure with the interior base material,
Step board of the first stage, so that a straight line along the edge of the nosing section side of the tread plate passes through the first shift position shifted to the intermediate side opposite side from the core position of the core columns, and the second stage and two step board of the eighth stage, the deviation in the intermediate side opposite side from the core position of the straight line on Kishinbashira along the edge of the nosing section side of the respective step boards and the core position and the second while being respectively so as to pass through the second displacement position and construction that is located between the 1 shift position,
Other five treadle around stairs, characterized in that the straight line along the edge portion of the nosing section side of the respective step boards are construction so as to pass through the core position of the core column. In claim 1 ,
The staircase is characterized by the same thickness as the interior base material. In claim 1 or 2 ,
The wrapping board is made of the same material as the interior base material. In any one of Claims 1-3 ,
Between the position of 300 mm from the inner end of the tread on the nose side end of each tread and the position of 300 mm from the inner end of the tread on the nose side end of the upper tread adjacent to the tread A staircase with a distance of 150 mm or more. A method for constructing a stairs around any one of claims 1 to 4 ,
After fixing the interior base material to the core pillar and fixing the laminated base board on the interior base material so as to form a double pasting structure with the interior base material,
A method for constructing a staircase, characterized in that each tread is constructed around the core pillar.

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