JP2000240214A - Form panel for placing concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight form panel excellent in durability, having strength and rigidity at a low cost by filling the interior of a plastic hollow molded article formed by blow molding with a foam body to form a plate-like body by forming simultaneously with molding. SOLUTION: A hollow molded article is formed using polyethylene resin or the like by low molding and simultaneously polyethylene beads are put in the interior and formed to form a form panel 20 mm or more thick. The form panels 1, 1 are disposed opposite to each other, fixed by use of a separator 2, vertical and lateral pipes 6, 7 and the like, and concrete is placed therebetween. After placing concrete, the form may be used as a wall surface, and used as a heat insulating panel of a heat accumulation tank or the like. Fitting work for the form can be easily performed without sing expensive materials such as wood, a metal form, FRP and the like. Thus, a form panel excellent in durability can be provided at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork panel for driving concrete into a predetermined shape.

[0002]

2. Description of the Related Art A conventional form panel has a thickness of 12 to 12 mm.
It is known that a small pine or cedar narrow plate of 24 mm is used as a tongue and toe, and a wooden stile is nailed around the periphery of the pine or cedar in the central longitudinal direction to measure 60 cm × 180 cm.
There are also sizes of 1/2, 1/3 and 1/4. In addition, there is a type using plywood as a mirror plate material. Further, there are also known ones in which a plywood is fitted in an iron frame, and those called a metal foam formed of iron, copper, aluminum or the like.

[0003] Wood is becoming more difficult to obtain and more expensive to protect resources. Metal foams are excellent in strength and durability, but have a disadvantage that they are heavy and difficult to handle, and those with special dimensions are custom-made and costly. Therefore, plastic form panels have recently been used. For example, fiber reinforced plastic (FRP), styrofoam, and solidified plastic waste chips are known.

[0004]

The FRP panel is expensive and relatively heavy. Styrofoam is light and easy to handle, but has problems in strength and durability. Also,
A solid waste chip has a drawback of poor durability.

Accordingly, an object of the present invention is to provide an inexpensive concrete formwork panel which is light and easy to handle, has sufficient strength and durability, and is inexpensive.

[0006]

In order to achieve the above-mentioned object, the present invention fills a plastic foam inside a blow-molded plastic hollow molded article, and fills the plastic foam simultaneously with the plastic hollow molding. In this way, the interface is satisfactorily fused and has sufficient strength and rigidity.

[0007]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, the mold panels 1 of the present invention are provided so as to face each other, and a predetermined interval is accurately maintained by the separator 2. A joiner or a P-con 3 is attached to both ends of the separator 2. A separator shaft 4 penetrating the form panel 1 is attached to the joiner 3, and a form tie 5 is attached to the separator shaft 4. A vertical pipe 6 and a horizontal pipe 7 are provided outside the form panel 1, and support the form panel 1. Concrete is poured between the form panels 1.

FIG. 2 is a plan view of the form panel 1 used in FIG. 1, in which a plurality of holes 8 for inserting the separator shaft 4 to be attached to the joiner 3 are formed, and a groove 9 is formed along the periphery.
Is formed. The formation of the groove 9 prevents the corners and the periphery of the hollow molded article 10 after blow molding from being rounded.

FIG. 3 is a cross-sectional view taken along the line AA of FIG. The form panel 1 is obtained by filling a plastic hollow molded article 10 to be blow-molded with a plastic foam 11. The depression 12 in which the hole 8 is formed can be easily formed by designing a mold at the time of blow molding. The same applies to the groove 9. The foam 11 is foamed by putting a foaming material, for example, beads therein, during blow molding of the hollow molded article 10, and the foam 11 is fused to the hollow molded article 10.

Form panel 1 as shown in FIGS. 2 and 3
Is blow molded using, for example, polyethylene, and at the same time, polyethylene beads are put into the inside and foamed. The thickness of the foam 11 not less than 20 mm, if the thickness of the hollow molded article 10 was not less than 0.5 mm, flexural modulus 1500 kgf / cm ² or more, a flexural strength of 30 kgf / cm ² or more, the specific gravity 0.2 It was below. At this time, the thickness of the foam 11 is 50 mm, and the thickness of the hollow molded article 10 is 2.0 m.
m, the size of the panel was 60 cm × 180 cm and the thickness was 50 mm as in the conventional case.

The hollow molded article 10 and the foam 11 are made of a material other than polyethylene, such as an olefin resin or ABS.
A thermoplastic resin such as a resin can be suitably used.
As the foam 11, polyurethane, polypropylene,
Polystyrene and the like can also be used. The thickness of the hollow molded article 10 is 0.2 to 7 mm, preferably 0.5 to 4 mm. Foam 1
The thickness of 1 is preferably 20 mm or more.

Although the groove 9 is formed on the surface not in contact with the concrete, such a groove 9 can be formed on the side peripheral surface. No such grooves 9 are formed on the surface that contacts the concrete. Blow molded hollow molded product 10
When the parison in the mold is molded by air blow, the resin at the edge is stretched most by blowing pressure, and especially in the case of a rectangular shape, the resin is cooled and solidified with the corners stretched. You. When the foamed material is foamed inside the hollow molded article 10 at the same time as or after the blow molding,
Since high-temperature steam at 120 ° C. to 140 ° C. is used for foaming, the heat causes secondary shrinkage of the hollow molded article 10, and the resin at the edges and corners of the hollow molded article 10 is pulled to the center, and These grooves 9 prevent the portions and the like from being rounded.
The width and depth of the groove 9 are preferably about 5 to 10 mm.

FIG. 4 shows that a mounting hole 8 'penetrating from the front surface to the back surface is formed at the time of blow molding instead of the above-described recess 12 and hole 8, and the separator 2 is formed by using the mounting hole 8'.
May be provided between the form panel 1 and the facing form panel 1.
The separator shaft 4 can be directly driven into the hollow molded article 10 and the foam 11 without providing the mounting holes 8 ′ and the holes 8.

FIG. 5 shows an example in which an attachment 13 (eg, a nut) for attaching the separator 2 is inserted into the hollow molded article 10 during molding. Such a structure is effective in a case where the formwork is directly used as a concrete wall surface or the like after the concrete is poured. For example, when this form panel 1 is used as a heat insulating panel of a heat storage tank, concrete is driven into the wall of the heat storage tank, and the heat insulating panel is stuck inside the tank at the same time when the wall is completed. When used as such a heat insulating panel, it is preferable to provide an anchor bolt on the form panel 1 in advance.

[0016]

As described above, according to the present invention, a plastic foam is filled in a blow-molded plastic hollow molded article, so that it can be manufactured at low cost.
It is lightweight and easy to handle, has sufficient strength, and has excellent durability. Further, when a foamed material is foamed during blow molding of a hollow molded article and the foam is fused to the hollow molded article, the flexural modulus and the bending strength are large. Further, when the thickness of the foam is 20 mm or more, both strength and lightness can be achieved. Further, in the case where the mounting fixture for mounting the separator is inserted into the hollow molded product at the time of molding by utilizing the blow molding of the hollow molded product, the operation of mounting the separator on the form panel becomes easy.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a plan view.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view showing a state in which a mounting hole is formed.

FIG. 5 is a cross-sectional view of a state where the attachment is insert-molded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Form panel 10 Hollow molded product 11 Foam

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Claims (4)

[Claims] 1. A concrete molding form panel in which a plastic foam is filled in a blow-molded plastic hollow molded article. 2. The concrete molding form panel according to claim 1, wherein a foaming material is foamed during blow molding of the hollow molded article, and the foam is fused to the hollow molded article. 3. The concrete formwork panel according to claim 1, wherein the thickness of the foam is 20 mm or more. 4. The concrete formwork panel according to claim 1, wherein a fixture for mounting the separator is inserted into the hollow molded product at the time of molding.