JPH035559A - Manufacture of stair made of concrete - Google Patents

Abstract

PURPOSE:To facilitate manufacture and execution of a work and to make finish looking excellent by a method wherein concrete is placed in forms of a triangular cross section, and footboards are formed by embedding anchors and are arranged in juxtaposition on concrete, placed in flat forms, before the concrete is cured. CONSTITUTION:Concrete 2 is placed in forms 1 formed in a triangular cross section and having a bottom part the corner part of which has a angle near a specified angle of 90 deg.. In this case, the one end of each of anchors 3 and 3 is embedded in the concrete 2, the other end is protruded, and the given number of footboards 4... is manufactured. Flat forms 6 are mounted in a place where stairs are built to place concrete 7 therein. Before the concrete is cured, the footboards 4... are arranged in juxtaposition, and the anchors 3 and 3 are embedded in the concrete 7.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention is characterized in that concrete stairs can be manufactured easily, and the interval between treads can be adjusted as appropriate during the manufacturing process. .

``Conventional technology'' Conventional concrete stairs are constructed by assembling formwork for the sloped part of the stairs, then assembling formwork for the steps, filling the formwork with concrete, and removing the form after the concrete has hardened. , I was installing this.

``Problems to be solved by the invention'' In the above-mentioned method, the structure of the formwork is complicated and assembly is troublesome and requires skill, and when filling with concrete, a large pressure is applied to the bottom of the formwork, causing The frame sometimes burst, so it took a lot of effort to clean it up. Further, in the case of such a structure, the tread portion has an uneven or rough surface, and repair work therefor is difficult, and the manufacturing process also requires a lot of effort and skill.

"Means for Solving the Problem" Therefore, the present invention was proposed to solve the above-mentioned inconvenience, and its configuration is such that one corner of the tread having a triangular cross section is formed at an angle close to 90 degrees. On the symmetrical slope, concrete treads with one end of the anchors buried at regular intervals and the other end protruding were prepared in advance, and a flat formwork with a concave cross section that would become the slope of the stairs was fabricated. The concrete is filled with concrete, and while the concrete is hardening, the inclined part of the treadle is placed and the protruding part of the anchor is buried in the concrete, so that a large number of treadboards are arranged in parallel, and after the concrete has hardened, it is removed from the mold. It was designed to do so. Therefore, the treads are manufactured using a formwork with a constant triangular cross section, so it is possible to make beautiful treads in advance.Concrete is poured into the flat formwork, and before it hardens, the treads are lined up and the anchors are Since the protruding portion can be buried and removed from the mold after hardening, it can be manufactured easily and can be made strong. Furthermore, there is no need to worry about the formwork cracking as no great pressure is applied to the lower part of the formwork.

Next, the method will be explained with reference to the drawings. (1) is the formwork for forming the treadboard, which has a triangular cross section and has a bottom corner of 90mm.
Fill the inside with concrete (2), insert one end of the anchor (3) into the concrete (2), let the other end stick out, harden it, and remove it from the mold. Fabricate the treadle (4) in advance. Next, concrete (7) is filled inside the flat formwork (6) with a concave cross section that forms the sloped part (5) of the stairs, and before this hardens, the previously manufactured treads (4) are placed on the stairs. The protruding parts of the anchors (3) are buried in concrete (7) in parallel to each other, hardened, and removed from the mold after hardening.

(8) is an auxiliary rod used together with the formwork (1), and the tread (4)
Cut and smooth the lower edge of the front of the lower tread (4).
This allows it to be placed stably at the rear of the vehicle, and has a triangular cross section.

To use this, as shown in Figure 7, the upper part of the concrete (2) placed in the formwork (1) is pressed against the edge of the formwork (1). (9) is a reinforcing bar.

"Function" As described above, the present invention provides concrete (2) in formwork (1).
) and place one end of the anchor (3) in concrete (2
), and after hardening, remove the mold to make a treadboard (4) in advance, pour concrete (7) into the flat formwork (6), and before the concrete (7) hardens, treadboards (4) are made. It is manufactured by embedding the protruding parts of the anchors (3) in parallel in concrete (7) and removing them from the mold after hardening.

Then, the stairs manufactured in this way can be transported to a construction site and installed, or a flat formwork (6) is attached to the location where the stairs will be installed in a building, and concrete (7) is poured. ) before hardening, the tread plate (4) is placed in a row, and the other end of the anchor (3) is buried inside the concrete (71).

"Effects of the Invention" The present invention can be manufactured quickly and easily because the tread plate (4) can be manufactured in advance and placed in parallel with the concrete (7) poured in the flat formwork (6). In addition, the finished product is clean, and there is no need for finishing or modification after installation, which shortens the construction period.

In addition, since the position where the lower end of the front part of the tread plate (4) overlaps the rear upper surface of the lower tread plate (4) can be adjusted as appropriate, the tread plate (
4) The layout is simple and manufacturing is easy.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and the first embodiment is shown in the drawings.
The figures are a side view of a staircase manufactured according to the present invention, Figure 2 is a sectional view of the tread, Figure 3 is a partial perspective view of the manufactured tread, and Figure 4 is a view of the flat formwork that will become the slope. A side view, FIG. 5 is a sectional view taken along the line A-A in FIG. 4, FIG. 6 is a partial perspective view of an auxiliary rod used in the formwork, and FIG. It is a diagram. (1)...Formwork, (3)...Anchor, (4)...Treadboard, (5)...Slope part,
(6)...Flat formwork, (7)...Concrete. Engraving of drawings (no changes in content) Procedural amendments

Claims (1)

[Claims] One corner of the tread (4), which has a triangular cross section, is set at an angle close to 90 degrees, and one end of the anchor (3) is buried at a constant interval on the symmetrical slope, and the other end is protruded. Concrete treads (4) are made in advance, and concrete (7) is filled into a flat formwork (6) with a concave cross section that will become the sloped part (5) of the stairs, and the concrete (7) is set in the middle of hardening. Place the sloped part of the footboard (4) on the anchor (3).
A method for manufacturing a concrete staircase, characterized in that a large number of treads (4) are arranged in parallel so that the protruding parts thereof are buried in concrete (7), and the molds are removed after the concrete (7) hardens.