JP2757678B2 - Manufacturing method of PC stairs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a PC staircase formed by precasting with concrete.

[0002]

2. Description of the Related Art In recent years, there are many construction materials formed as PC members, and even stairs of a multi-story building constructed of reinforced concrete are disclosed in, for example,
No. 248748 (E04F 11/14) discloses a method using a PC step.

Incidentally, such PC stairs are formed by casting concrete into a mold, and steel molds are often used for the purpose of securing accuracy and increasing the number of diversions. Then, the PC stairs formed by the steel formwork are carried into a construction site and attached to a building under construction.

[0004]

However, in such a conventional method for manufacturing a PC staircase, a PC staircase manufactured with a specific mold is constructed as only one standard. Therefore, when preparing PC stairs corresponding to a plurality of types of buildings, it is necessary to increase the types of formwork inevitably. However, the cost of manufacturing the steel formwork is significantly increased, and despite the fact that the formwork was made of steel in order to increase the number of diversions, the cost of the PC stairs increased due to the increase in the types of formwork. It will increase significantly. For this reason, the use of PCs for the stairs is not promoted, and construction by casting concrete on site by a conventional method has become common.

[0005] Therefore, it is extremely difficult to form the form of the tread and the riser in the field by the conventional construction method, and concrete is easily blown out from the corner between the tread and the riser. An extra post-processing operation for removing the blowing portion is required. For this reason, there is a problem that the construction period is prolonged and a large amount of labor is required to increase costs.

Therefore, in view of the above-mentioned conventional problems, the present invention forms a form using a plate material integrated with concrete to be cast on a tread and a riser where it is difficult to form the form. It is another object of the present invention to provide a method of manufacturing a PC staircase, which can significantly simplify the manufacture of a staircase by erecting a formwork and placing concrete.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a form for a PC stair by attaching a plate made of concrete or mortar to a position corresponding to a tread and a riser. At the same time, erect this formwork, place one side in the width direction of the stairs upward and open it,
In addition, the other side is placed below and closed, and concrete is poured from the upper open part of the formwork.

Further, the present invention is characterized in that the step portion formed into an L shape by the tread surface and the riser portion is a precast member, a bendable precast member or an extruded precast member.

Further, the present invention is characterized in that the tread and the riser are fixed to each other with L-shaped steel so that the width of the tread and the height of the riser can be adjusted.

[0010]

According to the method for manufacturing a PC staircase of the present invention having the above-described structure, when forming the formwork of the PC staircase, a plate material made of concrete or mortar is attached to a portion corresponding to the tread and the riser. Therefore, when the concrete is cast into the formwork, the cast concrete and the printing plate can be integrated. Therefore, when the mold is removed from the mold, a tread surface and a riser are formed by the plate material. By setting the surface of the plate material as a finished surface, the tread surface and the rise surface are removed when the mold material is removed from the mold frame. Post-processing of the riser can be greatly simplified.

[0011] Further, since the formwork is erected when the concrete is poured, and the concrete is poured from an opening on one side in the width direction of the stairs arranged above,
The concrete placing operation is significantly simplified, and the concrete can be spread to every corner inside the tread and the riser, so that the strength of the stairs can be set high.

[0012] The plate material corresponding to the tread surface and the riser portion, which is made of concrete or mortar described above, can be bent in an L-shaped precast member conforming to its shape, in a shape corresponding to the bent shape. That is, it may be configured by a bendable precast member having a folded portion at a joint portion between the tread surface and the riser, or an extruded precast member corresponding to the bent portion. Construction can be further simplified.

Further, by fixing the tread and the riser to each other with L-shaped steel, the positional relationship between the two can be easily adjusted in accordance with the width of the tread and the height of the riser.

[0014]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 5 show one embodiment of a method for manufacturing a PC staircase according to the present invention, FIG. 1 is a perspective view showing a state where concrete is poured into a molding die, and FIG. 2 is A in FIG.
FIG. 3 is an enlarged cross-sectional view showing a state in which the concrete casting corresponding to the line A is completed, FIG. 3 is a cross-sectional view showing a supported state of the forming mold, and FIG. FIG. 5 and FIG. 5 are perspective views of the plate constituting the tread and the riser as viewed from the back side.

That is, in the method of manufacturing the PC staircase 10 according to the present embodiment, as shown in FIGS.
And the outer periphery of the portion where the landings 14 and 14 are formed is plywood 1
6, and a tread surface 18 and a riser 20 are attached to the nose side of the upper surface of the portion where the diagonal slab 12 is formed to form a formwork 22. Concrete is poured into the formwork 22. ing.

The tread 18 and the riser 20 are
Mortar (or concrete) can be preliminarily bent at a factory or the like in a form corresponding to the bent shape of a PC plate formed into an L-shape conforming to the shape of the mortar (or concrete). A bendable PC plate having a folded portion at the joint portion of the PC plate or a PC plate extruded correspondingly is used, and the tread surface 1 made of these PC plates is used.
8 and the riser 20 are assembled to the formwork 22 using a number of crosspieces 24a and 24b. Then, as shown in FIG. 1, the formwork 22 is supported upright so that the width direction of the stairs is the up-down direction, and concrete 23 is cast in this upright state.

That is, as shown in FIG. 3, the mold 22 is first printed on the base 26, and then the anchor 28 is driven. Then, the nose side formwork 16a is processed and assembled by the plywood plate 16. At this time, at the same time, the crosspieces 24a, 24b for fixing the nasal nose and the fixing material 25 are attached, and the horizontal end 30 and the vertical end 32 are attached. Next, the nostril-side formwork is erected and fixed, and at the same time, the erection adjustment and the foot and head are fixed.

The treads 18 and the riser 20 made of PC are attached to the crosspieces 24a and 24b and the fixing member 25.
Is attached by gluing and nailing. At this time, as shown in FIG. 5, it is desirable that the pair of treads 18 and the riser 20 be connected in an L-shape in advance at the factory. Reinforcement piece 3
By attaching 3, the strength of the joint can be increased.

Next, after the treads 18 and the riser 20 have been attached, the vertical streaks 34 and the horizontal streaks 36 are assembled, and then the plywood 16 is worked to fix the step-back side formwork 16b and adjust the installation. Do. Therefore, in the state where the formwork 22 is raised and built, the formwork 22 is arranged such that one side in the width direction of the stairs is arranged upward and opened, and the other side is arranged below and closed by the base 26. State.

Next, as shown in FIG. 1, concrete 23 is poured into the formwork 22 from the upper open portion of the formwork 22. When the concrete 23 is hardened, the plywood plate 16 is removed and removed. Type.

The PC staircase 10 formed by the above manufacturing method
Is formed by erecting a formwork 22 surrounding a portion where the oblique slab 12 and the landings 14 and 14 are formed, and casting concrete 23 from an upper open portion thereof.
At this time, the formwork 22 corresponds to the nosing side of the oblique slab 12,
A tread surface 18 and a riser 20 formed of a PC plate material are attached to each other.

Therefore, when the PC stairs 10 are removed from the formwork 22, the tread surface 18 and the riser 20 formed of the PC plate material are integrated with the cast concrete 23. Therefore, the tread 18 and the riser 20
By preliminarily setting the surface of the PC plate material constituting the surface as a finished surface, it is not necessary to perform post-processing of the tread surface 18 and the riser 20. For this reason, it becomes possible to install the PC stairs 10 in a building in a state where the PC stairs 10 are removed from the formwork 22,
Work volume can be greatly reduced.

When the formwork 22 is raised and built, one side in the width direction of the stairs arranged above is opened, and the other side arranged below is closed and opened by the base 26. Since the concrete is cast from above, the work of placing the concrete 23 is remarkably easy, and the concrete 23 is spread all over the tread surface 18 and the inside of the riser 20 so that the nest can enter. Therefore, the strength of the PC staircase 10 can be set high.

The tread 18 and the riser 20
The appearance can be further improved by sticking a P tile on the tread. However, even in the case of sticking the P tile in this manner, the tread surface 18 and the riser 20 formed of the PC plate material are flat. Since it can be the lower ground, the finish of the laying surface of the P tile can be made clean and the work of attaching the P tile can be facilitated.

In the above embodiment, the case where the tread surface 18 and the riser portion 20 are formed of separate PC plates and connected in an L-shape by bonding or the like is disclosed, but as shown in FIG. The tread 18 and the riser 20 are formed by molding
The structure of the mold 22 can be further simplified by using an L-shape integrally formed by using a foldable PC plate.

The same applies to the above embodiment, but FIG.
By fixing the tread surface 18 and the riser 20 with the L-shaped steel 27 as shown in FIG.
The positional relationship between the two can be easily adjusted according to the height of zero.

[0027]

As described above, according to the present invention, P
In the method for manufacturing the C stairs, when forming the formwork of the PC staircase, a plate material made of concrete or mortar is attached to a portion corresponding to the tread surface and the riser, and concrete is poured into the formwork. Since the concrete is poured into the formwork, the concrete and the printing plate can be integrated.
For this reason, when the PC stairs are removed from the formwork, the tread and the riser can be formed by the plate material, so that the finishing work of the tread and the riser can be largely omitted. .

Further, the formwork is raised when casting concrete, and the concrete is poured from the upper open portion, so that the concrete placing operation becomes extremely simple and the concrete is treaded. And it can be spread to every corner inside the riser, and the strength of the stairs can be set high.

Further, a plate material corresponding to the tread and the riser, which is made of the concrete or mortar described above,
An L-shaped precast member conforming to the shape, a bendable precast member that can be folded in a shape corresponding to the bent shape, that is, a bendable precast member having a folded portion at a joint between a tread and a riser, or A corresponding extruded precast member may be used. In this case, the same operation and effect can be ensured, and the construction can be further simplified.

Further, by fixing the tread and the riser to each other with L-shaped steel, the positional relationship between the tread and the riser can be easily adjusted in accordance with the width of the tread and the height of the riser.

Therefore, it is possible to greatly simplify the manufacturing of the PC stairs to shorten the construction period, reduce the labor and reduce the cost, and provide the PC stairs having excellent durability. It has various excellent effects.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which concrete is poured into a formwork of a PC staircase showing one embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view corresponding to the line AA in FIG. 1 in a state where concrete casting is completed.

FIG. 3 is a sectional view showing a support state of a mold used in an embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional side view showing a main part of a supporting state of a mold used in an embodiment of the present invention.

FIG. 5 is a perspective view of a plate constituting a tread and a riser used in an embodiment of the present invention, as viewed from the back side.

FIG. 6 is an enlarged sectional view of a main part showing a mold used in another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 PC stairs 12 Diagonal slab 14 Landing 18 Tread 20 Stake-in part 22 Formwork 23 Concrete 24a, 24b
Girder 27 L-shaped steel 34 Vertical streak 36 Horizontal streak

Claims (3)

(57) [Claims] 1. A PC stair form is formed by attaching a plate material formed of concrete or mortar to a position corresponding to a tread surface and a riser, and the form is raised and raised to one side in the width direction of the stair. Is placed above and opened,
A method for manufacturing a PC staircase, wherein the other side is disposed below and closed, and concrete is poured from an upper open portion of the formwork. 2. The PC according to claim 1, wherein the step portion formed into an L shape by the tread surface and the riser portion is a precast member, a bendable precast member, or an extruded precast member. How to make stairs. 3. The tread and the riser are fixed with L-shaped steel so that the width of the tread and the height of the riser can be adjusted. PC
How to make stairs.