JPH048505A - Bendable pc concrete shuttering and its manufacture - Google Patents

Abstract

PURPOSE:To manufacture extremely easily and in a short time a PC concrete shuttering, by a method wherein bendable members are arranged within a horizontal-platelike concrete shuttering at appropriate intervals, concrete is placed between the bendable members, the bendable member and concrete are stuck close to each other and demolded. CONSTITUTION:A horizontal-platelike concrete shuttering is constituted by combining concrete shuttering plates 2 and a fixed number of hinges 5, for example, the two hinges 5 are arranged within this concrete shuttering in parallel with each other at desired intervals. Concrete 3 is placed between the hinges 5 and when the concrete 3 is dried and cured, the same is demolded. A flat- platelike PC concrete shuttering 1 where three flat-platelike concrete plates 31, 32, 33 are connected with one another by the two hinges stuck among the concrete plates each is completed. The concrete plates 31, 32, 33 can be bent easily at parts of the hinges 5, in the flat-platelike PC concrete shuttering 1. Both the end concrete plates 31, 33 are bent at the hinges 5, 5, met at right angles with the middle concrete plate 32 and made almost U-shaped. When the U-shaped matter is fitted to a beam or pillar part and fixed with a reinforcement material, a beam concrete shuttering is formed.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for manufacturing a bendable PC formwork,
In particular, the present invention relates to the above-mentioned PC formwork, which has stable quality, short manufacturing time, can be stored and transported in large quantities in a narrow space, and is easy to use at construction sites, and a method for manufacturing the same.

(Conventional technology) Conventionally, when pouring concrete into beams, columns, etc., after constructing the steel frames and reinforcing bars for the beams, columns, etc., formwork plates are attached around the steel frames, etc. This was done by pouring concrete into the ground.

However, in this construction method, the formwork plates are installed and removed after the concrete has dried and hardened. Particularly, the formwork plates are installed in places where the work environment is poor, such as corner beams and columns. Installation and removal are complicated and take a long time.

Therefore, in recent years, in order to omit the installation and removal work of the above-mentioned formwork boards, for example, U-shaped forms such as those shown in Fig. 5 (A) and (B) have been used to match the outer circumferential shape of beams, columns, etc. A precast concrete formwork 01 is manufactured in advance at a factory, etc. (hereinafter, this formwork is referred to as PC formwork), and this PC formwork 0
1 to a predetermined beam or column, and concrete is poured into the PC formwork 01, which has been developed and put into practical use.

According to this construction method, the PC formwork 01 itself becomes a component of the outer periphery of beams, columns, etc., so it is not necessary to remove the PC formwork 01 after pouring concrete into the PC formwork 01. This simplifies the work and significantly shortens the construction period.

(Problems to be Solved by the Invention) However, the conventional method for manufacturing the PC formwork 01 has the following problems.

That is, the PC formwork 01 shown in FIG. 5(A) is first
Concrete 03 is placed on the formwork plate 02a which becomes the bottom of the U-shape.
After concrete 03a is poured and the concrete 03a hardens, four formworks 02b that will form the sides of the U-shape are assembled, concrete 03b is poured between these four formwork plates 02b, and finally the formwork Board 02a.

It was manufactured by removing 02b.

According to this manufacturing method, concrete 03 with a U-shaped bottom
After pouring a and hardening, concrete 0 on the U-shaped side
3b, not only will there be a concrete pouring section 04, but also the concrete pouring will have to be completed 2 times.
It is a hassle to do it often. Furthermore, in the mix of concrete for the sides, the water-cement ratio must be increased due to workability, which deteriorates the quality of the concrete. Therefore, the quality of the products varies, the yield is poor, and manufacturing costs rise. In addition, concrete)03
Wait for hardening of a, assemble formwork 02b and concrete 0
3b had to be cast, which increased the manufacturing time.

In addition, the PC formwork 01 shown in FIG. 5(B) is first constructed into a U-shape using six formwork plates 02, and then concrete 03 is integrally placed between these six formwork plates 02. It was manufactured by pouring and finally removing the formwork plates 02a and 02b.

In this manufacturing method, there is no concrete pouring part 04 like the PC formwork 01 shown in FIG. Nor. However, it is not easy to pour concrete into the rising part α of the U-shape, and sometimes the concrete does not wrap around the 6th part, resulting in poor yields and a rise in manufacturing costs.

In particular, when manufacturing a thin U-shaped PC formwork 01,
In the rising portion α, not only the above-mentioned defects are likely to occur, but also breakage accidents may occur when the form plate 02 is removed (ie, demolded).

Moreover, it is inconvenient when changing the size of the PC formwork or installing a through sleeve at the rising part.

Furthermore, both the thin and floating PC formworks 01 are bulky and require a large amount of space for storage and transportation, leading to problems such as high storage and transportation costs.

The present invention has been made in view of the above points, and
The aim is to be able to manufacture products easily and in a short time without causing variations in product quality, even if they are thin or floating, as well as to be able to store and transport large quantities even in a small space. The purpose of the present invention is to propose a method for manufacturing a bendable PC formwork that is easy to use at construction sites.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a PC formwork in which linear bendable members are incorporated into a PC board, and as a specific manufacturing method, a horizontal plate shape After arranging bendable members at appropriate intervals in the formwork and pouring concrete between the bendable members and fixing the bendable members and concrete, the mold is removed. Features.

Preferably, a hinge or a flexible joint material is used as the bendable member.

(Function) In the manufacturing method according to the present invention, bending members made of hinges or flexible joint materials such as rubber or plastic are placed in advance at appropriate intervals in a horizontal plate-like form. Place concrete between the bent members.

After this concrete is dried and hardened, it is removed from the mold to produce a flat PC formwork to which the above-mentioned bending members are fixed at appropriate intervals.

This PC formwork can be bent at the bending member fixed to the concrete, and has flexibility.

Such bendable PC molds are manufactured in advance in large quantities at a factory, etc., and stored in flat plate shapes.

Then, the required number of flat plates are transported to a construction site, etc., where they are bent at the above-mentioned bending parts according to the shape of the required beam or column, and fixed to form the formwork for the beam or column. .

Concrete is then poured into the formwork. When the concrete dries and hardens, beams, columns, etc. using the PC formwork as the outer peripheral material are completed without removing the above-mentioned PC formwork.

(Example) FIG. 1 shows an example of the manufacturing method according to the present invention in a state immediately after concrete is poured, and in this example, a hinge is used as the bending member.

As shown in the figure, first, formwork plates 2 are combined to form a horizontal plate-like formwork, and within this formwork a desired interval (i.e., an interval according to the dimensions of beams, columns, etc., in this example) is formed. A predetermined number (two in this example) of hinges 5 are arranged in parallel at intervals corresponding to the width of the beam.

Next, concrete 3 is poured between these two hinges 5, and when the concrete 3 is dried and hardened, it is removed from the mold.

Then, three slabs of concrete 31, 32, 33
A flat PC formwork 1 is completed in which the concrete plates are connected by two hinges 5 fixed between each concrete plate.

This flat PC formwork 1 allows three concrete plates 31, 32, and 33 to be easily bent at the hinge 5.

Figure 2 shows the bendable P manufactured as described above.
This figure shows how the C formwork 1 is used.

That is, the concrete plates 31 and 33 at both ends are attached to the hinge 5.
．． 5, and make it perpendicular to the concrete plate 32 inside to form a roughly U-shape.

Although not shown in the drawings, this U-shaped piece is attached to a portion of a column or pillar (in this example, a beam) and fixed with reinforcing material (shoring) to form a beam formwork.

Concrete is then poured into this beam formwork. When this concrete dries and hardens, it is integrated with the beam formwork described above, and a beam is constructed using the PC formwork 1 as the outer peripheral material.

FIG. 3 shows another embodiment of the manufacturing method according to the present invention in a state immediately after concrete is poured. In this embodiment, a flexible joint material 6 made of rubber, plastic, etc. is used as a bending member. I am using it.

In this figure, first, as in the case of Fig. 1, formwork plates 2 are combined to form a flat formwork, and a desired interval (in this example, in the case of Fig. 1) is set in the formwork. Similarly, a predetermined number (two in this example) of joint materials 6 are arranged in parallel at intervals corresponding to the width of the beam.

Next, concrete 3 is placed between these two joint materials 6, and when the concrete 3 is dried and hardened, it is removed from the mold.

Then, three slabs of concrete 31, 32, 33
A flat PC formwork 1 is completed in which the concrete plates are connected by two joint materials 6 fixed between each concrete plate.

This flat PC formwork 1 can easily bend three concrete plates 31, 32, and 33 at the joint material 6 portion.

Figure 4 shows the bendable P manufactured as described above.
This figure shows how the C formwork 1 is used.

That is, as in the case of FIG. 2, the concrete plates 31 and 33 at both ends are bent at the joint materials 6, 6 to be perpendicular to the concrete plate 32 inside, forming a roughly U-shape.

As in the case of Fig. 2, this U-shaped thing is attached to a beam or column (beam in this example), fixed with reinforcing material (shoring), and then attached to the beam formwork (not shown). form.

Then, as in the case of Figure 2, concrete is poured into this beam formwork, and once this concrete dries and hardens,
A beam is constructed which is integrated with the beam formwork described above and has the above PC formwork 1 as its outer peripheral material.

In addition, in the case of FIG. 1 and FIG. 3, by manufacturing the PC formwork 1 using three or four hinges 5 or flexible joint materials 6, Square shapes and pentagon shapes other than the PC formwork of the square beams in Figures 2 and 4...
It can be used as formwork for concrete pouring of beams and columns etc.

(Effects of the Invention) As detailed above, according to the manufacturing method of the present invention,
Since there is no concrete pouring, the pouring work is completed in one step, and demolding is easy because the concrete is poured on a horizontal form board, which is what is called flat pouring.
A thin PC formwork can be manufactured from a prototype extremely easily and in a short time.

In addition, as mentioned above, since concrete is placed by pouring in the field, hard mixing is sufficient for mixing the concrete.
There is no generation of bleed water that adversely affects the quality of concrete. In addition, concrete can be placed uniformly without the risk of creating jitters or the like. As a result, according to the production method of the present invention, stable,
Furthermore, high quality PC molds can be manufactured, yields can be improved, and manufacturing costs can be significantly reduced.

Furthermore, since the PC formwork according to the present invention can be transported in its flat form, a large amount of PC formwork can be stored and transported in a narrow space, and storage and transportation costs are also significantly reduced. .

Furthermore, the PC formwork according to the present invention can be easily bent and is extremely easy to use on site.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the manufacturing method according to the present invention, FIG. The figures are diagrams showing other embodiments of the manufacturing method according to the present invention, FIG. 4 is a diagram for explaining how the PC formwork according to the present invention manufactured by the method of FIG. 2 is used, and FIG. (A) and (B) are diagrams showing a conventional method of manufacturing a PC formwork.

Claims (3)

[Claims] (1) A bendable PC formwork characterized by incorporating a linear bendable member into a PC board. (2) After arranging bendable members at appropriate intervals in a horizontal plate formwork and pouring concrete between the bendable members to fix the bendable members and concrete. A method for manufacturing a bendable PC formwork, which comprises removing the mold. (3) Claim 2, wherein a hinge or a flexible joint material is used as the bendable member.
The method for manufacturing the PC formwork described.