JPH06248694A - Placing form for concrete - Google Patents

Abstract

PURPOSE:To provide both rigidity and lighweight to concrete by burying bar- shaped cores impregnating chemical fiber having tensile strength stronger than concrete with thermoplastic resin in all directions in a concrete slab. CONSTITUTION:Chemical fibers having tensile strength stronger than concrete is impregnated with thermoplastic resin to solidify, and bar-shaped cores 2 are formed of a braid formed fiber bodies. After that, the cores 2 are buried in a middle part of a thick direction of a concrete slab in all directions. gutters 3... as U-shaped or V-shaped recess gutters are respectively formed. By using the concrete slab, a placing form having lightweight efficiency and rigidity is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting formwork of a type in which a concrete body is formed as it is without being dismantled after the concrete is poured.

[0002]

2. Description of the Related Art Heretofore, as a mold of this type, a U-shaped thin-walled driving mold has been known in which a core material b of stainless mesh is embedded in a high-strength cement hardened body a as shown in FIG. This high-strength cement hardened body a is a mixture of cement, fine silica, and a special additive mixed with a thermosetting melamine resin, and can be made to have a thickness of 20 mm and a weight of 48 kg / m ² . Further, as shown in FIG. 2, a driving form is also possible in which a plate-shaped high-strength cement hardened body a is embedded with reticulated fibers as a core material b and a V-shaped folding groove c is provided at an appropriate position so as to be bendable. Proposed. Further, the applicant has also proposed a rod-shaped reinforcing material in which several fiber bundles of chemical fibers such as aromatic polyamide fibers are knitted in a braided form and impregnated with a binder of synthetic resin and cured. JP-A-61-2
90250, JP 62-7655 A, US Pat. No. 468567, etc.).

[0003]

The formwork shown in FIG. 1 is
Since a manufacturing mold must be prepared for each different size, the number of manufacturing steps is large, and since special cement is used, the manufacturing cost is high and the transportation efficiency is poor.
Further, the formwork shown in FIG. 2 is not inconvenient as the formwork of FIG. 1, but the bending strength of the formwork is insufficient due to the insufficient rigidity of the reticulated fibers, and when the formwork is installed, the formwork is often surrounded. However, there is a drawback in that the weight of the mold is large because the concrete must be made relatively thick in order to provide strength, because the work of installing the temporary frame is required to be inefficient.

An object of the present invention is to solve the drawbacks of such a driving mold and to provide a driving mold having both rigidity and light weight.

[0005]

According to the present invention, a rod-shaped core material made of a braided fibrous body obtained by impregnating a concrete plate with chemical fibers having a tensile strength higher than that of concrete and impregnating the resin with a thermoplastic resin to cure the chemical fibers. By embedding in the vertical and horizontal, by forming a fold groove in the concrete plate at appropriate intervals,
The above-mentioned purpose is achieved.

[0006]

In the concrete board having the above-mentioned structure, since the core material having relatively rigidity is embedded in the vertical and horizontal directions by the hardening of the thermoplastic resin, the stress acting on the concrete board is supported by the core material and the thickness of the concrete is reduced. Even if it is thin, it will not break easily and the driving form made of this concrete board will be lighter. In order to bend the concrete plate along the folding groove to form a driving form for a beam or a column, the core material exposed inside the folding groove is heated by an appropriate heating means to soften the thermoplastic resin. Can be easily bent. Also, when the concrete board is cut to an appropriate size, it can be cut more easily than when the core material is metal or mesh fiber.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 3 and 4. Reference numeral 1 is a concrete plate which is solidified by using ordinary concrete, and 2 is a rod-like shape which is embedded in the concrete plate 1 vertically and horizontally. The core material 3 is a groove formed on the surface of the concrete board 1 at appropriate intervals. Details of the rod-shaped core material 2 are as shown in FIG. 5, and organic fibers such as aromatic polyamide fibers having a tensile strength higher than that of the concrete, and chemical fibers 4 such as inorganic fibers such as glass fibers and carbon fibers 4 are used. A plurality of fiber bundles 5 prepared by aligning a plurality of the same are prepared, the fiber bundles 5 are knitted to form a braid, and then a thermoplastic resin 6 is impregnated and cured to form a rod-shaped fiber core material. It was set to 2.

In order to impregnate the core material 2 with the thermoplastic resin 6, the fiber bundle 5 may be impregnated with the molten thermoplastic resin 6 in advance, and this may be knitted into a braid. As the thermoplastic resin 6, a resin such as nylon, polyester, or polyethylene which becomes plastic at a relatively low temperature of slightly over 200 ° C. is used.
In consideration of the heat resistant temperature of, the thermoplastic resin 6 is selected to be plastic at a temperature lower than that temperature. Preferably, a resin that becomes plastic at a temperature lower by 100 ° C. or more than the heat resistant temperature of the chemical fiber 4 is selected as the thermoplastic resin 6. In the example, an aromatic polyamide fiber having a diameter of 6 to 10 μm is used as the chemical fiber 4, and 600 of this is used.
Six 0-denier fiber bundles 5 were knitted into a braid, which was dipped in molten polyethylene to impregnate the thermoplastic resin 6 and cured to obtain a core material 2 having a diameter of 3 mm.

As shown in FIG. 6, the concrete plate 1 is made by arranging a core material 2 vertically and horizontally with an appropriate space between the vibrating mold frames 7, 7 separated from each other. The frames 7 and 7 are closed, concrete is filled in the space inside, and after vibrating, solidifying and curing, the production molds 7 and 7
It is possible to manufacture by decomposing. still,
When the upper surface of the concrete board 1 is finished by ironing, the upper manufacturing frame 7 can be omitted.

In the example of FIG. 3, the core material 2 is arranged in the middle portion of the concrete board 1 in the plate thickness direction, and the fold grooves 3 are formed symmetrically on both sides of the board 1. As shown in FIG. The concrete plate 1 is arranged so as to be offset to one side in the thickness direction, and the folding groove 3 is provided on one side.
May be provided. The shape of the folding groove 3 is preferably V-shaped as shown in the figure, and the valley bottom thereof forms 90 °, and the core material 2 in the lateral direction is exposed at the valley bottom, but it is also U-shaped or other concave groove. Good. The thickness of concrete board 1 is 10
15 mm, spacing between V-shaped grooves 3, 3 is 100-300
In the case of mm, two core members 2 were arranged in the vertical direction at intervals of the folding grooves 3 and 3, and the core members 2 were arranged in the horizontal direction at the same pitch as the vertical direction.

An example in which the concrete plate 1 is used as a column driving form is as shown in FIG. 7, which is folded by a heating means such as a hot air blower in order to bend it in the folding groove 3 at an appropriate position. The core material 2 traversing the groove 3 is heated to soften the thermoplastic resin 6 impregnated in the core material 2. Then, after forming a rectangular form frame, the folding groove 3 on the outer peripheral surface is filled with a backup material 8 made of synthetic resin or the like conforming to the groove shape, and the periphery is fixed with a belt or temporary equipment so that the rectangular shape does not collapse. , Placing concrete in the formwork. Although not shown, necessary reinforcing bars are arranged in advance in the rectangular form. After the cast concrete is solidified, the belt, the temporary equipment and the backup material 8 are removed, and the formwork is left as it is with the pillar. Bending stress acts on the formwork as concrete is cast, but the core material 2 is a rod-like material having a relatively high rigidity, which is solidified by a thermoplastic resin, and the surface of the core material is uneven due to the braided knitting. Since the moldability is high with the concrete, the mold has rigidity even if the plate thickness is thin, and therefore it is possible to reduce the weight and the number of temporary equipment supporting the mold, thereby improving workability.

[0012]

As described above, according to the present invention, a rod-shaped rod made of a braided fibrous body obtained by impregnating a concrete plate with chemical fibers having a tensile strength higher than that of concrete and impregnating it with a thermoplastic resin to cure the chemical fibers. Since the core material is embedded vertically and horizontally and the folding grooves are formed in the concrete plate at appropriate intervals, a lightweight and rigid driving form can be obtained, and there is an effect that workability is improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a conventional example.

FIG. 2 is a cutaway plan view of another conventional example.

FIG. 3 is a cutaway plan view of an embodiment of the present invention.

FIG. 4 is a front view of FIG.

FIG. 5 is a perspective view showing a state in which a part of a braided fiber body is disassembled.

FIG. 6 is a perspective view of a driving form of the present invention in a manufactured state.

FIG. 7 is a perspective view of the driving form of the present invention in use.

FIG. 8 is a cutaway plan view of another embodiment of the present invention.

[Explanation of symbols]

1 Concrete board 2 Core material 3
Fold groove 4 Chemical fiber 5 Fiber bundle 6
Thermoplastic resin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Hayashida 1-10 Nakahama-cho, Amagasaki-shi, Hyogo Shinko Steel Wire Industrial Co., Ltd.

Claims (3)

[Claims] 1. A bar-shaped core material made of a braided fiber body obtained by impregnating and hardening a thermoplastic resin into a chemical fiber having a tensile strength higher than that of concrete is embedded in a concrete plate in a suitable manner in the vertical and horizontal directions. A driving form for concrete placing, characterized in that folding grooves are formed in the concrete plate at intervals. 2. A rod-shaped core material made of the braided fiber body is vertically and horizontally embedded in an intermediate portion in the thickness direction of the concrete plate, and folding grooves are formed at target positions on both sides of the concrete plate. The casting formwork for concrete pouring according to claim 1, wherein 3. The casting formwork for concrete pouring according to claim 1, wherein the folding groove is a U-shaped groove or a V-shaped groove.