JPH0642177A - Method for execution for concrete stairway - Google Patents

Abstract

PURPOSE:To execute a concrete stairway at inexpensive manufacturing cost. CONSTITUTION:With a concrete stairway form 10 provided with an outer side 10B forming a side part 16C of a concrete stairway 16, a serrated form part 10A forming a stair tread 16A and a riser 16B of the concrete stairway 16, and an auxiliary form part 14 adjusting the number of steps of the stairway 16, two types of the concrete stairway 16, on one hand, different in height of the riser 16B and the concrete stairway, on the other, different in the number of steps, totaling four types are manufactured, respectively. Among them, a combination of the same type or different, paired concrete stairways 16 are selected so as to come nearest to the floor height in a desired setting spot and installed in the desired setting spot.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete stair construction method using a concrete stair formwork, among the stair construction methods for middle and high-rise buildings.

[0002]

2. Description of the Related Art Conventionally, the concrete stairs used in middle and high-rise buildings have different floor heights, so
It was necessary to construct concrete stairs by performing complicated work at different floor heights at each construction site.

Therefore, it takes a lot of time and labor in both the design and construction stages of the concrete stairs, and requires skill in construction and the like, which is an obstacle to shortening the construction period of the middle-high-rise building.

Therefore, in recent years, there has been proposed a precast concrete staircase formwork which is preliminarily manufactured in a factory or the like while maintaining the degree of freedom in design and construction.

Examples thereof are disclosed in, for example, Japanese Patent Publication No. 60-22603 and Japanese Patent Laid-Open No. 2-179706. These examples are usually called free-form molds, and are made so that one type of mold can be made adjustable and any floor height can be arbitrarily accommodated.

[0006]

However, since these free formwork have a complicated structure, the production cost is high and the durability is poor. For this reason, the depreciation cost of the precast concrete stair formwork was high.

[0007] In addition, since the stairs are made of precast concrete, the stairs suitable for each mounting location are produced in accordance with the height of each floor. Therefore, it is necessary to produce the stairs in advance and supply the stairs if necessary. I couldn't.

In consideration of the above facts, an object of the present invention is to provide a concrete stair construction method which can cope with a desired floor height of a mounting place and is inexpensive to manufacture.

[0009]

A concrete stair construction method according to a first aspect of the present invention uses a concrete stair formwork to manufacture a plurality of concrete stairs having different kick heights and step numbers. And a step of selecting a combination of a pair of concrete stairs closest to the floor height of the desired mounting location among the manufactured concrete stairs, and a step of fixing the selected stairs to the desired mounting location,
It is characterized by having.

In the concrete stair construction method according to the second aspect of the present invention, a total of four types of concrete stairs are manufactured, two concrete stairs each having a different rise height and two different concrete stairs, The feature is that a combination of stairs of the same kind or different kinds is selected so as to fit the floor height of a desired mounting place.

[0011]

According to the concrete stair construction method of the first aspect, the concrete stair form is used to manufacture the concrete stairs in which at least one of the step height and the number of steps is different. From the manufactured concrete stairs, the concrete stairs that best fit the floor height of the desired installation location are selected. After selection, fix the concrete stairs to the desired mounting location. Therefore, it is possible to construct concrete stairs without performing complicated work at different floor heights at each construction site.

According to the concrete stair construction method of claim 2, concrete stairs having different rise heights,
Two types of concrete stairs, each with a different number of steps,
A total of four types of concrete stairs are manufactured, and a combination of the same or different types of stairs is selected so as to fit the floor height of the desired mounting place, and the concrete stairs are fixed to the desired mounting place. Therefore, it is possible to provide the concrete stairs at a low manufacturing cost, because the concrete stairs can be adapted to the desired floor height of the mounting place simply by manufacturing the four kinds of concrete stairs.

[0013]

1 to 3, there is shown a precast concrete staircase formwork 10 according to this embodiment. Also,
4 and 5 show a concrete staircase 1 according to this embodiment.
6 is shown.

As shown in FIGS. 1 and 2, the mold 10
Has a sawtooth mold part 10A and a pair of outer parts 10B provided on both sides thereof, and the auxiliary mold 12 and the auxiliary mold 14 can be assembled. As shown in FIG. 3, the saw-toothed mold portion 10A is formed in a saw-tooth shape with a top portion 10C and a bottom portion 10D, and forms a tread surface 16A and a riser 16B of the concrete stairs 16. In this example,
Two types of formwork 10 having different heights H1 of the risers 16B are used.

The outer portion 10B is a side portion 16C of the stairs 16.
(See FIG. 4). The auxiliary formwork 12 is pivotally supported by the formwork 10 via a shaft 12A, is rotatable in the direction of arrow A in FIG.
When you remove it, rotate it and place it so that it does not interfere with the removal. The auxiliary formwork 12 is the staircase 1 shown in FIG.
It has a recess 12B for molding the fastening portion 16D of No. 6 and a hole 12C into which the anchor reinforcing bar 20 can be inserted. Auxiliary formwork 1
4 is a formwork 1 for molding the bottom layer of the concrete stairs 16.
It has a concave portion 14A that fits into the end portion 10E of 0 and a convex portion 14B that forms the concave portion 16E at the bottom of the concrete stairs 16. Further, the auxiliary formwork 14 moves in the direction of arrow B to adjust the number of steps of the concrete stairs 16.
For example, when eight steps of stairs are desired as in this embodiment, the auxiliary formwork 14 is installed in the solid line portion. When 7 steps of stairs are desired, the auxiliary formwork 14 is installed in the two-dot chain line part.

Next, a method of manufacturing and constructing the precast concrete stairs 16 according to this embodiment will be described.

First, the pre-assembled reinforcing bars 18 of the stairs 16 are laid on the formwork 10. As shown in FIG. 6, the reinforcing bar 18 has a main bar 18A and a reinforcing bar 18B. that time,
Reinforcing bar 18B in a sawtooth shape along the tread surface 16A and the riser 16B.
Is arranged. A main bar 18A is laid in the direction perpendicular to the plane of the drawing on the inner side of the bent portion of the reinforcing bar 18B arranged in a sawtooth shape near the nose 16F or near the riser 16G. Two reinforcing bars 18D are arranged in parallel to the inclined portion 16H of the stairs 16. At that time, the reinforcing bars 18 have the desired cover thicknesses D1 and D.
2 is secured by using a spacer or the like. Further, the anchor reinforcing bar 20 is inserted into the fastening portion 16D in advance. The anchor reinforcing bar 20 is formed in a substantially L shape, and the tip of the long side portion is projected from the fastening portion 16D. The tip of the short side of the anchor reinforcing bar 20 is in contact with the reinforcing bar 18D.

Next, the auxiliary formwork 12 is installed at a predetermined position. At that time, the anchor reinforcing bar 20 is adjusted so as to be inserted into the hole 12C. Next, the auxiliary formwork 14 is installed in the solid line part or the two-dot chain line part so as to form the required number of steps. Then, concrete is driven into the mold 10.
At that time, concrete is poured so that no gap is formed between the auxiliary mold 12 and the auxiliary mold 14 as well. After the driving is completed,
Curing for a certain period. After the curing of the concrete stairs 16, the auxiliary formwork 12 is opened, the auxiliary formwork 14 is removed, and the concrete staircase 16 is taken out from the formwork 10,
Store it in a warehouse.

Next, the stairs 16 corresponding to the desired floor height are selected. As shown in Table 1, in this embodiment, the kick-up 1
6B has two types of height H1, the number of steps is different, and the height of stairs 16 is 2 types of H2 and H3, and 4 types of concrete stairs 16 are produced. Produce stairs that can meet the above requirements, and select the combination of stairs that is most suitable for the floor height of the installation location. After the selection, the concrete stairs 16 are transported to the installation location. If the floor height of the installation location does not correspond to Table 1,
The most suitable combination is selected, and when installing the concrete stairs 16, it is adapted to the floor height of the installation place.

[0020]

[Table 1]

In Table 1, the desired floor height is 2550-305.
A correspondence table in the range of 0 (mm) is shown. Keage 16B
When the height H1 is 182 mm, it is indicated as A. The case where the height H1 of the rise 16B is 189 mm is displayed as B. Also, the number 7 after A or B in the combination column
Alternatively, 8 represents the number of stairs. Normal,
Floor heights are designed at 50 mm intervals. Therefore, when the desired floor height is, for example, 2550 mm, the stairs of the combination of A7 + A7 in Table 1 are selected. Similarly, the desired floor height is 3050 mm
In the case of, the stairs of the combination of B8 + B8 in Table 1 are selected. Since the error in the former case is about 2 mm, there is almost no problem, but in the latter case, an error of about 26 mm occurs. In this case, adjust according to the mounting angle of the stairs. The depth of the staircase with tread 16A of 250 mm and 7 steps is 15
Since it is 00 mm, the inclination angle is only about 1 ° even if the maximum error occurs. Therefore, when the stairs are actually attached, it is usual to provide a water gradient on the tread surface, so this degree of inclination is not a problem.

Next, as shown in FIG. 6, a pair of concrete stairs 16 are mounted at desired mounting locations. The lower end of the concrete stairs 16 is installed on the floor 22 on the lower floor, and the upper end is fixed to the landing floor 23 provided at the center of the floor height H4. At that time, as shown in FIG. 7, the anchor reinforcing bar 20 and the reinforcing bar 23A of the floor 23 are connected via a fixture 24. As shown in FIGS. 8 and 9, the fixture 24 is provided with a long hole 24A, and has a substantially oval shape when viewed in the horizontal direction of the paper surface of FIG. After inserting the anchor reinforcing bar 20 and the reinforcing bar 23A into the fixture 24, the wedge-shaped member 24B is inserted into the elongated hole 24A to reduce the gap between the anchor reinforcing bar 20 and the reinforcing bar 23A and fix them together.
After connecting the anchor reinforcing bar 20 and the reinforcing bar 23A, concrete is poured into the gap 26, and the concrete stairs 1
The floor surface 28 formed by 6 and the floor 23 is made flat.

The floor 23 of the landing and the floor slab 3 on the upper floor
The other concrete stairs 16 arranged between 0 and 0 are constructed in the same procedure as described above.

[0024]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the concrete stair formwork having a simple structure is used, and the concrete staircase is manufactured using a small number of types of formwork, and the floor height of a desired mounting place is set. Therefore, the concrete stairs can be mass-produced in advance, the concrete stairs can be provided at a low manufacturing cost, and the construction period can be shortened, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a plan view showing a concrete staircase formwork 10 to which an embodiment of the present invention is applied.

FIG. 2 is a side view showing a concrete staircase formwork 10 to which an embodiment of the present invention is applied.

FIG. 3 is a sectional view taken along line 3-3 of the concrete staircase formwork 10 shown in FIG.

FIG. 4 is a side view showing a concrete staircase 16 to which one embodiment of the present invention is applied and which has seven steps.

FIG. 5 is a side view showing a concrete staircase 16 to which an embodiment of the present invention is applied and which has eight steps.

FIG. 6 is a side view showing a state in which a pair of concrete stairs 16 to which an embodiment of the present invention has been applied is installed at a desired mounting location.

FIG. 7 is a cross-sectional view showing the arrangement of reinforcing bars 18 of a concrete staircase 16 to which an embodiment of the present invention is applied and showing the joint relationship between the concrete staircase 16 and the landing floor 23.

FIG. 8 is a detailed view showing a concrete staircase 16 to which an embodiment of the present invention is applied and a fixture 24 of a landing floor 23.

9 is a sectional view taken along line 9-9 of the fixture 24 shown in FIG.

[Explanation of symbols]

 10 Formwork for concrete stairs 10A Sawtooth mold part 10B Outside part 16 Concrete stairs 16B Raising

Claims (2)

[Claims] 1. A method of constructing a concrete staircase using a concrete staircase formwork, which comprises manufacturing a plurality of concrete staircases in which at least one of the height of the kick and the number of steps is different, using the formwork for the concrete staircase. Concrete stairs comprising: a step of selecting a combination of a pair of concrete stairs closest to the floor height of a desired mounting location among the selected concrete stairs; and a step of fixing the selected stairs to the desired mounting location. Stair construction method. 2. A total of four types of concrete stairs are manufactured, two concrete stairs each having a different kicking height and two concrete stairs having a different number of steps, of which the closest to the floor height of the desired mounting location. The concrete stair construction method according to claim 1, wherein a combination of a pair of stairs of the same kind or different kinds is selected.