JP3239921B2 - Driving formwork for stairs and stairs construction method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving form for a stair, which is a form for concrete driving used when constructing a concrete stair, and a method of constructing a stair using the same, and more particularly to a forming method. The present invention relates to a driving form for stairs that can also serve as a riser and a riser, and a method of constructing a stair using the same.

[0002]

2. Description of the Related Art In recent years, many stairs have been constructed in buildings and condominiums, etc., as buildings become higher and higher. In civil engineering work, the height of construction is increasing, and the importance of stairs is increasing. Concrete construction of stairs requires a great deal of time and labor, and is a place where skilled technology is required due to its complicated shape, even when compared with construction of other walls and floors. The construction in a conventional concrete staircase will be described below. FIG. 9 is a flowchart showing the procedure of the conventional construction of stairs. First, the slab formwork on the lower part and side surface of the stairs is assembled (S1). Next, reinforcing bars are arranged stepwise on the slab formwork (S2). Next, a concrete form plate (sill plate) is assembled at the position of the riser (S3).
Next, after the concrete is cast, it is cured (S4).
Next, the concrete form plate is dismantled (S5). Next, a finishing smearing operation is performed (S6). Next, a non-slip attachment work is performed (S
7). Next, plastering finishing (mortar finishing)
Is performed (S8). Next, mortar finishing of the tread surface is performed (S9), and the process ends. Among the above-mentioned processes, the formwork work involves many members which are heavy objects to be moved manually, and thus requires a lot of man-hours for on-site work. In addition, most of them are labor steps of carpenters, and are processes that require time and labor.

[0003] Also disclosed are a construction method and a staircase in which the number of steps is reduced by using a concrete formwork as a tread plate or a riser plate even after construction. For example, (a) Japanese Utility Model Laid-Open Publication No. 3-66334 (hereinafter referred to as "A" publication) states that "a base metal fitting is mounted on an embedding metal fitting in a slab inclination direction embedded in an oblique flat slab having no step portion, and a glass fiber reinforced concrete kick. A staircase using a glass fiber reinforced concrete riser, in which a cement-based filler is poured into a step portion using a base plate as a mold and the glass fiber reinforced concrete riser is left. " (B) Japanese Patent Publication No. 56-20422 (hereinafter referred to as “B” publication) discloses that “a pair of inclined rectangular side plates are disposed to face each other at a predetermined interval, and extend in the longitudinal direction of the side plates. A wedge-shaped concave portion provided in the edge flange bulging inward at the lower end portion is successively provided with a support rod having the same shape on the side end surface and having an upper edge abutting in the upper longitudinal direction and protruding from the upper edge. A plate serving as a back plate between the edge flange and the support rods is placed and supported, and the partition plate is fitted so as to engage the horizontal step portion connected to the upper end portion of the groove with the upper edge of the partition plate. Is fitted in a horizontal groove, and concrete is driven in and cured, thereby forming a staircase. " (C) In Japanese Patent Application Laid-Open No. 58-135264 (hereinafter referred to as “C” publication), “Instead of a tread formwork and a riser formwork, a formwork having a previously formed tread portion and a riser portion is also used. Using the stair unit, fix the end of the stair unit to the side mold, drive concrete into the space formed by the bottom mold, the side mold and the stair unit, and after the concrete has hardened, A stair construction method in which a stair is formed by removing a formwork. "

[0004]

However, in the above-mentioned conventional form for driving stairs, there is a problem that the concrete form plate must be dismantled after the concrete is cast and the number of steps is large. Further, since the upper surface of the concrete is mortar-finished, there is a problem in that the concrete lacks strength and is inferior in impact resistance. In addition, in the stairs using the glass fiber reinforced concrete riser disclosed in Japanese Patent Publication No. A, a diagonal flat slab without steps must be cast in advance in concrete, but when this flat slab is constructed, the formwork is assembled. However, there are problems that many steps such as dismantling are required, workability is poor, and workability is poor. In addition, when casting the flat slab, hardware for constructing a step on the flat slab must be buried.However, when the flat slab is cast, construction accuracy is required, and the work is complicated and requires skill. Had. Further, the conventional method of constructing stairs requires many steps for construction, requires a great deal of labor, and has a problem of lack of labor saving. Further, there is a problem that a skilled craftsman is required, the construction period is long, and the construction cost is high. In addition, in the stair construction method disclosed in the publications B and C, it is necessary to cast concrete in a state where the tread formwork and the riser formwork are integrated and sealed. Due to concrete subsidence, cavities are likely to be formed between the backside of the tread formwork and the upper surface of the concrete, the strength of the stairs is reduced, the durability is poor,
There was a problem of lack of stability. Further, there is a problem that it is difficult to confirm this cavity. In addition, there is a problem that breathing occurs at the time of placing the concrete, and the adhesive force between the tread formwork and the concrete is reduced. Furthermore, since the filling of concrete cannot be confirmed, there is a problem that the construction is difficult.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a driving form for stairs which has a small number of construction steps, can be easily constructed, can shorten the construction period, and has sufficiently high strength and toughness. It is another object of the present invention to provide a construction method using a stairway driving formwork that has a small number of construction steps, is excellent in labor saving with a small number of people, is easy to perform construction, and can shorten the construction period.

[0006]

In order to achieve this object, according to the first aspect of the present invention, there is provided a driving form for stairs, wherein a non-slip portion having a predetermined pattern on an upper surface and a non-slip portion having an upper surface are provided. An upper horizontal portion, a vertical portion bent and connected to an end of the upper horizontal portion, and a fixing hole for fixing a metal fitting formed at a predetermined portion near the end of the upper horizontal portion. , And at least the upper horizontal portion and the vertical portion are formed of fiber reinforced concrete. The staircase driving form according to claim 2 is a non-slip portion having a predetermined pattern on the upper surface, an upper horizontal portion in which the non-slip portion is disposed on the upper surface, and a bend into an end of the upper horizontal portion. A vertical portion, a lower horizontal portion bent at the lower end of the vertical portion in a direction opposite to the upper horizontal portion, and a metal fitting formed at a predetermined portion near the end of the upper horizontal portion. And a fixing hole for fixing, at least an upper horizontal portion,
The vertical part and the lower horizontal part have a configuration formed of fiber reinforced concrete. According to a third aspect of the present invention, there is provided a stairway driving form having a configuration in which the non-slip portion has a concave portion on an upper surface and a groove structure on a lower surface in any one of the first and second aspects. According to a fourth aspect of the present invention, there is provided a stairway driving formwork according to any one of the first to third aspects, wherein the upper horizontal portion and / or the vertical portion and / or the lower horizontal portion have a rough back surface. It has a certain configuration. According to a fifth aspect of the present invention, there is provided a stair driving formwork according to any one of the first to fourth aspects, wherein the metal fitting is provided upright at a horizontal portion having a continuous hole at a substantially central portion and at an end of the horizontal portion. And a side having a locking hole at a predetermined position. According to a sixth aspect of the present invention, there is provided a driving form for stairs according to any one of the first to fourth aspects, wherein the metal fitting has a horizontal portion having a continuous hole in a substantially central portion, and a horizontal portion extending from a lower portion of the horizontal portion to an upper horizontal portion. And a support portion connected continuously at a bending angle of the vertical portion and a side portion connected to the horizontal portion and the outer portion of the support portion and having a locking hole at a predetermined position. A method for constructing a stair using the stair driving form according to claim 7, wherein the slab form is assembled in a slab form assembling step of assembling a slab form in a lower part and a side of the stair. A reinforcing bar arranging step of arranging reinforcing bars in a step-like manner, and the vertical portion of the stair driving form according to any one of claims 1 to 4 is fixed to a fixing hole in a riser portion of the stairs. It is provided with a step for placing a formwork for stairs to be arranged at predetermined intervals via metal fittings, and a step for placing and finishing concrete for placing concrete in the formwork for stairs and simultaneously finishing the tread surface. Configuration.

Here, the fibers used for reinforced concrete include organic fibers and inorganic fibers. As the organic fibers, vinylon fibers, acrylic fibers, polypropylene fibers, polyethylene fibers, polyamide fibers, and the like are used. As the inorganic fiber, glass fiber, carbon fiber, steel fiber, asbestos, SiC fiber, Al ₂ O ₃ fiber, potassium titanate fiber, or the like is used. Those which are easily degraded by alkali are used after being subjected to alkali resistance treatment. The fibers may be either long fibers or short fibers,
The length is preferably 1 to 100 mm, particularly preferably 5 to 50 mm. As the length of the fiber becomes less than 5 mm, the strength tends to be insufficiently obtained, which is not preferable. As the length of the fiber exceeds 50 mm, the dispersion of the fiber in the concrete tends not to be uniform, which is not preferable. The thickness of the fiber is 0.05-40 μm, especially 0.1-30 μm
m is preferred. As the thickness of the fiber becomes less than 0.1 μm, the strength tends to be insufficient, which is not preferable. As the thickness of the fibers exceeds 30 μm, the dispersion of the fibers tends to become non-uniform, which is not preferred.

As a method of impregnating the fiber with concrete, a method of mixing organic or inorganic fibers, cement, sand and water, pouring them into a mold, curing them, a method of press molding, a method of centrifugal force molding and the like are used. Is used. As cement used for concrete, hydraulic lime,
Blast furnace cement, Roman cement, natural cement, Portland cement, alumina cement and the like are used.
As the non-slip portion, one having a concave groove portion having a width of 2 to 10 mm and a depth of 1 to 4 mm in the longitudinal direction is used. The one in which a mesh-shaped concave portion is provided in the upper horizontal portion is also used. This is to prevent a person who goes up and down the stairs from falling. Epoxy resin, polysulfide rubber, silicone RTV, cyanoacrylate, and inorganic adhesive are used for adhesion between the non-slip portion and the upper horizontal portion. Before casting the fiber reinforced concrete into the mold at the time of the production of the stamping formwork, the non-slip portion is set in the mold and integrally molded. This is because the non-slip portion and the upper horizontal portion can be firmly fixed to improve durability. The fixing hole is a hole through which a bolt for fixing a metal fitting for attaching the staging form is passed. In the fixing of the driving form for stairs and the side wall according to the present invention, the driving form for stairs is engaged with the side wall and is fixed with an L-shaped fitting or a T-shaped fitting. The inner surfaces of the upper horizontal portion, the vertical portion, and the lower horizontal portion are preferably rough surfaces. This is to improve the adhesiveness with concrete. Examples of the method for forming a rough surface include shot blasting, grindering, and a method of attaching a concave and convex shape to a mold in advance.

[0009]

According to this structure, the stepping formwork can block the concrete at the time of placing the concrete and can place the concrete stepwise. In addition, the concrete form for stairs can be used as it is with the vertical part and the upper horizontal part as treads after concrete is cast. Therefore, removal of the formwork, mortar finishing work, and the like are unnecessary, and the construction process can be shortened. Further, since the staircase driving formwork of the present invention is made of concrete impregnated and reinforced with fibers, it is lightweight, can be attached to the side wall without providing an oblique flat slab, and is easy to transport. Furthermore, the strength is remarkably high, the toughness is high, and the impact resistance is high. In addition, the inner surfaces of the upper horizontal portion, the vertical portion and the lower horizontal portion are rough surfaces, so that the driving form for stairs and the concrete can be firmly joined, and the durability is high. In addition, the upper horizontal portion has a non-slip portion to prevent the user from falling down. In addition, the anti-slip portion is provided directly at the same height as the tread, so that it is durable and has a good appearance. The fixing holes allow the metal fittings to be firmly and easily attached to the driving form for stairs, and the construction is easy.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a partial perspective view of a driving form for stairs in a first embodiment of the present invention, and FIG. 2 is a sectional side view of the driving form for stairs in the first embodiment of the present invention. FIG. 3 is a perspective view showing a state in which an L-shaped metal fitting is attached to the stepping formwork in the first embodiment. In FIGS. 1 and 2, A is a driving form for stairs in the first embodiment, 1 is a plate-shaped upper horizontal portion made of glass fiber reinforced concrete which becomes a part of a tread after construction, and 2 is a riser after construction. A plate-shaped vertical portion made of glass fiber reinforced concrete integrally formed and connected at an end portion of the upper horizontal portion 1 having a bending angle α of 50 ° to 110 °, preferably 70 ° to 90 °, Numeral 3 is a non-slip portion made of a tile or the like, which is provided on the upper surface of the upper horizontal portion 1 which becomes a part of the tread plate after construction, is joined by a groove structure, and has a groove portion having a width of 2 to 10 mm and a depth of 1 to 4 mm parallel to the longitudinal direction. Reference numeral 4 denotes a fixing hole for inserting a fixing tool such as a bolt for fixing a metal fitting for arranging the stepping formwork A on the stair side wall. In FIG. 3, reference numeral 5 denotes an L for fixing the driving form A for stairs and the side wall.
The metal fitting 6 has a plate-like horizontal portion made of carbon steel or the like fixed on the non-slip portion 3, and the metal drilling 7 is provided at a substantially central portion of the horizontal portion 6 and provided on the fixing hole 4. A continuous hole 8 for inserting a fixture, which will be described later, to be fixed to the stepping form A, is provided upright at the end of the horizontal portion 6 and integrally formed therewith to fix the stepping form A to the side wall. A side portion made of carbon steel or the like in contact with the side wall,
Reference numeral 9 denotes a locking hole for inserting two locking members such as screws for fixing the side wall and the metal fitting 5 at two holes formed at a predetermined interval in the side portion 8, and 10 is inserted into the fixing hole 4 and the continuous hole 7. Driving form A and metal fittings 5 for stairs
It is a fixing tool composed of bolts or the like for firmly fixing the.

Next, a method for constructing a stair form according to a first embodiment of the present invention will be described with reference to the drawings. FIG.
5 is a flowchart showing a procedure for constructing a stair using a stair-drive formwork in the first embodiment. First, the slab formwork at the lower part of the stairs and the slab formwork forming the side of the stairs were assembled into an outer frame shape of the stairs. The side wall formed on the side of the stair was formed in a sawtooth shape so that the lower portion was engaged with the passage formwork (slab formwork assembling step, S10). Next, reinforcing bars were arranged stepwise in the slab form (rebar reinforcing process, S
11). Next, as shown in FIG. 3, the L-shaped fitting 5 was fixed on the non-slip portion 3 of the stepping form A. This fixing was performed by screwing a fixing tool 10 such as a bolt into the fixing hole 4.
The driving form A for stairs was disposed so that the vertical portion 2 was located at the riser portion of the stairs. At this time, the driving form A for the stairs is fixed to the lower end of the sawtooth side of the side wall via the L-shaped metal fitting 5 by a fastener such as a screw, and the end face is brought into contact with the slab form forming the side of the stairs, and the concrete is formed. It was arranged so as not to leak (step of placing a driving form for stairs, S12). Next, the driving form A for stairs
And concrete was poured into the space forming the stairs in the slab formwork, and at the same time, the open surface of the concrete to be the tread was adjusted to the non-slip portion 3 (concrete casting and finishing step, S13). Furthermore, metal fittings 5 after hardening concrete
After the removal of the fixing holes 4 and the like, the process was terminated.

According to this embodiment, an upper horizontal portion and a vertical portion made of glass fiber reinforced concrete having a non-slip portion formed on the upper surface are connected to each other and have a substantially L-shaped cross section, and are provided near the ends of the upper horizontal portion. Since the fixing holes are provided, the staircase formwork of the present invention can be used as a formwork at the time of concrete casting and can be used as a stair riser after concrete placement. Therefore,
The construction process can be shortened and construction efficiency can be improved. In addition, the tread surface is open, so that concrete can be poured easily and the tread surface can be constructed without construction defects. In addition, since the driving form for stairs is made of glass fiber reinforced concrete, it is lightweight, has high strength, and has high toughness. Therefore, the handling is easy and the construction is simple, and at the same time, even if it is used as a riser, it is not damaged, so that the durability is improved. In addition, it has a non-slip part on the upper horizontal part, so that the safety of stair users can be secured. Since the non-slip portion is provided at the same height as the tread plate and there is no projection, the non-slip portion is less likely to be damaged, and is durable and has an excellent appearance.

(Embodiment 2) FIG. 5 is a cross-sectional side view of a driving form for stairs according to a second embodiment of the present invention. In FIG. 5, 1 is an upper horizontal portion, 2 is a vertical portion, and 4 is a fixing hole.
Since these are the same as in the first embodiment, the same reference numerals are given and the description is omitted. B is a staircase form in the second embodiment, and 11 is a non-slip portion formed directly on the upper surface of the upper horizontal portion 1 and formed in parallel with the longitudinal direction and having a groove having a width of 2 to 10 mm and a depth of 1 to 4 mm. According to the present embodiment, since the groove of the non-slip portion is formed directly on the upper surface of the upper horizontal portion, the first
In addition to the effects described in the embodiment, there is no danger of the anti-slipping portion falling off, and the durability is improved. In addition, since the non-slip portion is integrally formed at the time of forming the stair form, the manufacturing process is simple and the productivity is high.

(Embodiment 3) FIG. 6 is a partial perspective view of a driving form for stairs according to a third embodiment of the present invention, and FIG. 7 is a perspective view of a driving form for stairs according to a third embodiment of the present invention. It is sectional side view. 6 and 7, 1 is an upper horizontal portion, 2 is a vertical portion, 4 is a fixing hole, and 11 is a non-slip portion. Since these are the same as the first and second embodiments, the same reference numerals are given and the description is omitted. C is a stepping form in the third embodiment of the present invention, and 12 is a bending angle β of 50 ° to 110 °, preferably 70 ° to 90 ° at the lower end of the vertical portion 2.
It is a plate-shaped lower horizontal portion made of glass fiber reinforced concrete that is bent and formed horizontally in a substantially Z-shaped cross section. FIG. 8 is a perspective view of the third embodiment in which the driving form for stairs is attached to the side wall with a T-shaped bracket. In FIG. 8, C is a stepping form in the third embodiment, 13 is a T-shaped fitting for fixing the side wall to the stepping form C, and 14 is carbon disposed on the upper horizontal portion 1. A plate-shaped horizontal portion made of steel or the like, 15 is a continuous hole formed on the horizontal portion 14 and disposed on the fixing hole 4, and 16 is a stair hole for being inserted into the fixing hole 4 and the continuous hole 15. A fixture 17 such as a bolt for firmly fixing the mounting form C and the metal fitting 13, and a plate-like support 17 made of carbon steel or the like, which is provided continuously from the lower part of the horizontal part 14 in contact with the vertical part 2 and supports the vertical part 2 Reference numeral 18 denotes a plate-like side portion made of carbon steel or the like, which is vertically connected to the outer ends of the horizontal portion 14 and the support portion 17 and is in contact with the side wall, and 19 denotes a horizontal portion of the side portion 18. At a predetermined position in the vicinity of the portion 14 and the support portion 17, a locking device to be described later is inserted, and the side wall and the metal fitting 13 are firmly locked, and the side wall and the stairs are A locking hole for fixing the mounting form C, a locking tool 20 which is inserted into the locking hole 19 and is made of a screw or the like which locks the side wall and the metal fitting 13, 21 is a lower end formed in a sawtooth shape, and The side wall on which the stair-drive formwork C is disposed at the portion, 22 is a reinforcing bar arranged in a step-like manner. According to this embodiment, the lower horizontal portion is provided horizontally at the lower end of the vertical portion. In addition to the effects described in the first and second embodiments, the lower horizontal portion is used as a reference. Leveling during concrete casting becomes easy. In addition, since the lower horizontal portion is connected to the vertical portion, the rigidity of the stepping formwork can be increased. Therefore, the driving form for the stairs can be made thinner and lighter, and the handling becomes easier.

[0015]

As described above, according to the present invention, an upper horizontal portion having a non-slip portion formed on an upper surface, a vertical portion connected to an end of the upper horizontal portion, and a perforation near an end of the upper horizontal portion are provided. Since it has a fixed hole and is made of fiber reinforced concrete, an excellent staircase form having the following effects can be realized. (1) The driving form for stairs can be used as a formwork at the time of placing concrete, and at the same time, can be used as a riser and a tread of the stairs after placing the concrete. Therefore, the mortar finishing work for removing the formwork or the like is unnecessary, and the construction process can be shortened, and the construction period can be shortened. (2) The tread surface is released, so that the concrete placement state can be directly checked and the tread surface can be accurately constructed. (3) Since it is made of fiber reinforced concrete, it is extremely lightweight, can be easily attached to and supported on the side wall without providing an inclined flat slab, and the construction process can be shortened. In addition, transportation and handling are easy and work efficiency is high. (4) Since it is made of fiber reinforced concrete, it has high strength and toughness, and has high impact resistance and durability. (5) The non-slip portion having the groove on the surface allows the user to move up and down without slipping, and is safe. Further, since the non-slip portion is formed at the same height as the tread plate, the anti-slip portion is excellent in durability and has a beautiful appearance. (6) The metal fittings can be firmly attached by the fixing holes, and since it is lightweight, it can be directly attached to the side wall, and the construction is simple and reliable. In addition, the method for constructing a staircase using the formwork for a passage of the present invention uses the formwork for a staircase of the present invention as a formwork at the time of placing concrete, and at the same time, uses the formwork for a staircase as a riser and a stepboard after the construction. The construction process can be greatly shortened and the construction can be simplified.

[Brief description of the drawings]

FIG. 1 is a partial perspective view of a driving form for stairs according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional side view of a driving form for stairs according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a state in which an L-shaped bracket is attached to the stair driving formwork in the first embodiment.

FIG. 4 is a flowchart showing a procedure of stair construction using a stair driving form in the first embodiment;

FIG. 5 is a sectional side view of a driving form for stairs according to a second embodiment of the present invention.

FIG. 6 is a partial perspective view of a driving form for stairs according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional side view of a driving form for stairs according to a third embodiment of the present invention.

FIG. 8 is a perspective view of a state where the staircase driving formwork according to the third embodiment is attached to a side wall with a T-shaped bracket.

FIG. 9 is a flowchart showing a conventional stair construction procedure.

[Explanation of symbols]

 A Stair driving formwork in the first embodiment 1 Upper horizontal portion 2 Vertical portion 3 Non-slip portion 4 Fixing hole 5 Metal fitting 6 Horizontal portion 7 Continuous hole 8 Side portion 9 Locking hole 10 Fixing tool B Second embodiment Stair driving formwork 11 in non-slip portion C stair driving formwork in the third embodiment 12 lower horizontal portion 13 metal fitting 14 horizontal portion 15 continuous hole 16 fixing tool 17 support portion 18 side portion 19 locking hole 20 Locking tool 21 Side wall 22 Reinforcing bar

Continuation of the front page (56) References JP-A-6-173403 (JP, A) JP-A-61-117354 (JP, A) JP-A-62-225651 (JP, A) JP-A-50-56526 (JP) , U) Jingu 4-37153 (JP, Y2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) E04F 11/00-11/116 E04G 13/06

Claims (7)

(57) [Claims] A non-slip portion having a predetermined pattern on an upper surface;
The non-slip portion is formed on a predetermined portion such as an upper horizontal portion disposed on an upper surface, a vertical portion bent and connected to an end of the upper horizontal portion, and a portion near an end of the upper horizontal portion. And a fixing hole for fixing a metal fitting, wherein at least the upper horizontal part and the vertical part are formed of fiber-reinforced concrete. 2. A non-slip portion having a predetermined pattern on an upper surface,
The upper horizontal portion in which the non-slip portion is disposed on the upper surface, a vertical portion bent and connected to an end of the upper horizontal portion, and a lower end of the vertical portion opposite to the upper horizontal portion. A lower horizontal portion that is bent and connected, and a fixing hole that fixes a metal fitting formed at a predetermined portion such as near the end of the upper horizontal portion,
At least the upper horizontal part, the vertical part, and the lower horizontal part are formed of fiber reinforced concrete, and the driving form for stairs is characterized by the above-mentioned. 3. The non-slip portion has a concave portion on an upper surface and a groove structure on a lower surface.
5. The driving form for stairs according to any one of the above. 4. The method according to claim 1, wherein a back surface of the upper horizontal portion and / or the vertical portion and / or the lower horizontal portion is a rough surface. Driving formwork for stairs. 5. The metal fitting has a horizontal portion having a continuous hole at a substantially central portion, and a side portion provided upright at an end of the horizontal portion and having a locking hole at a predetermined position. 5. The stair driving form according to any one of claims 1 to 4, characterized in that: 6. A horizontal part having a continuous hole in a substantially central part, a support part connected from a lower part of the horizontal part to a bent angle of the upper horizontal part and the vertical part, and And a side portion connected to the outer portion of the support portion and the support portion and having a locking hole at a predetermined position.
5. The driving form for stairs according to any one of the above. 7. A slab form assembling step for assembling the slab form at the bottom and side of the stairs, and a reinforcing bar reinforcing step for arranging reinforcing bars in the slab form assembled in the slab form assembling step. 5. A staircase for arranging the vertical portion of the driving form for a staircase according to any one of claims 1 to 4 at a predetermined interval through a metal fitting fixed to the fixing hole in a riser portion of the staircase. A step for placing a formwork, and a step for placing and finishing concrete in the form for the stair and simultaneously finishing the tread surface. Construction method of stairs using