JPH04333761A - Sheathing board for form for concrete structure - Google Patents

Abstract

PURPOSE:To increase the efficiently of a processing and assembly work by a method wherein two places forming the surface and the rear positioned facing each other are intercoupled through a plurality of lines of reinforcement located in juxtaposition and a central part is located between the lines of reinforcement to form a sheathing for forms. CONSTITUTION:Synthetic resin is integrally molded by extrusion molding to form a sheathing board 1. In the sheathing board 1, two plates 2 and 2 which form the surface and the rear are intercoupled through a plurality of lines 3 of reinforcement arranged in juxtaposition in the longitudinal direction of the sheathing board 1 to form hollow parts 4, formed approximately in the shape of an oval in cross section, intercoupled in a longitudinal direction between the adjoining lines 3 and 3 of reinforcement. This constitution provides the sheathing board 1 which is reduced in weight, improves handling properties, and improves strength.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a weir plate for formwork for forming concrete structures.

0002

[Problems to be Solved by the Invention] Plywood veneer is generally used for conventional formwork weir plates. When this plywood veneer is large in size, it becomes quite heavy and difficult to handle manually. In addition, since there is no light transmission, the area surrounded by the formwork becomes dark, creating a poor working environment and making it impossible to confirm the degree of concrete filling inside the formwork. Also, weir plates made of synthetic resin have already been used, but they are either single-layer plates or laminated plates, which are heavy and expensive.

[0003] This invention aims to improve the above-mentioned conventional weir plate.

0004

[Means for Solving the Problems] The gist of the invention (1) is a weir plate for formwork made of synthetic resin, which includes a plurality of reinforcements arranged in parallel in one direction between two opposing flat plates constituting both the front and back surfaces. A weir plate for formwork of a concrete structure, which is connected by reinforcing strips and has a hollow part between the reinforcing strips. The invention (2) resides in the weir plate for formwork for concrete structures as described in (1) above, characterized in that the hollow portion is formed by closing the opening end face.

[0005] The hard synthetic resins used for this formwork weir board include hard thermoplastic resins such as hard vinyl chloride resin, high-density polyethylene, polypropylene, polycarbonate, and polystyrene, and thermoplastic resins such as unsaturated polyester resins and phenolic resins. Curable resins are preferably used.

[0006]

[Function] This weir board for formwork connects the flat plates on both the front and back sides with reinforcing strips, and a hollow part is provided between the reinforcing strips.It is lightweight and easy to handle, and has high strength and is strong enough to be used as a weir board. It can be done. The transparency can be increased, and compared to plywood veneer weir plates, it provides a brighter and better working environment, allowing the user to check the degree of concrete filling inside the formwork and mold a structure without defects. In addition, the weir plate surface is smooth and has good peelability from concrete, improving the smoothness of the plastic concrete surface and increasing the number of times the weir plate can be used. Furthermore, this weir plate, which has a hollow space between its front and back surfaces, has high heat insulation properties and functions to prevent poured concrete from freezing during concrete pouring in winter.

[0007]

[Embodiments] The following will explain the embodiments shown in the drawings. FIG. 1 shows a weir plate 1 for a formwork made of polypropylene resin and integrally molded by extrusion molding. This weir plate 1 is constructed by connecting two flat plates 2, 2 forming both the front and back sides with a plurality of reinforcing strips 3 arranged in parallel along the longitudinal direction of the weir plate.
A hollow portion 4 having a substantially oval cross section and communicating in the longitudinal direction is formed therebetween.

Similar to the conventional plywood veneer weir board, this weir board is made by assembling a formwork using joists, end pieces, separators, pipe supports, etc., and pouring concrete to form a concrete structure. was completed. During construction, the weir plates were lightweight, which facilitated labor-saving processing and assembly, and created a bright and comfortable work environment in the space below the floor slab formwork. In addition, we were able to mold a structure with no defects by checking the degree of concrete filling from outside the weir plate and with excellent smoothness of the peeling surface. We were able to increase the number of reuses of the dam board to 8 to 10 times (compared to about 3 times for conventional plywood dam boards).

The weir plate 1 of the embodiment shown in FIG. 2 is made of hard vinyl chloride resin, and has two flat plates 2 on both the front and back surfaces.
2 and a corrugated plate 5 inserted between them, and a plurality of reinforcing strips 3 that connect the two flat plates 2 by fusing their contact surfaces.
' and a hollow part 4' between the reinforcing strips 3', 3'. This weir plate had the same functions and effects as the weir plate made of polypropylene mentioned above.

[0010] Instead of the above-mentioned thermal fusion of the contact surfaces of the flat plate and the corrugated plate of the dam plate, adhesive bonding, high frequency fusion, etc. may be used.

The weir plate 1 of the embodiment shown in FIGS. 3, 4, and 5 is integrally molded by injection molding, and includes a flat plate 2, reinforcing strips 3,
The weight was reduced by reducing the wall thickness.

The weir plate 1 of the embodiment shown in FIGS. 6, 7, and 8 is integrally formed by vacuum forming, and the two butt ends where the hollow part 4 opens are closed by a closing part 6. Closing the end face of the butt end is preferable because it prevents concrete slurry from entering and the end face can be reinforced.

The weir plate 1 of the embodiment shown in FIGS. 9, 10, and 11 has a butt end reinforcing material 8 having a protrusion 7 that fits into the hollow part 4 fitted to the two end faces where the hollow part 4 opens. It was blocked. Like the above-mentioned weir plate, this weir plate also prevents concrete slurry from entering the hollow part, and the end of the butt end is reinforced.

Weir plate 1 of the embodiment shown in FIGS. 12, 13 and 14
The hollow part 4 is closed by fixing a closing material 9 made of a flat plate or tape to the two end surfaces of the ends where the hollow part 4 opens.

[0015]

[Effects of the Invention] This weir plate for formwork for concrete structures is as described above, and has the following effects.

[0016] ■ Efficiency of formwork processing and assembly work ■
Improving the working environment ■ Improving the degree of concrete filling and surface smoothness ■ Increasing the rotation speed for diversion of weir plates and reducing the cost of weir plates.

[0017] ■ Preventing poured concrete from freezing in winter.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an example weir plate integrally molded by extrusion molding.

FIG. 2 is a sectional view of an embodiment of a weir plate in which a flat plate and a corrugated plate are fixed together.

FIG. 3 is a side view of a thin-walled weir plate integrally formed by injection molding.

FIG. 4 is a perspective view of the weir plate of FIG. 3;

FIG. 5 is a cross-sectional view of the weir plate of FIG. 3;

FIG. 6 is a side view of the weir plate of the embodiment in which the end face of the butt end is closed with a closing part.

FIG. 7 is a perspective view of the weir plate of FIG. 6;

FIG. 8 is a cross-sectional view of the weir plate of FIG. 6;

FIG. 9 is a side view of the weir plate of the embodiment in which the butt end surface is closed by fitting the butt end reinforcing material.

FIG. 10 is a perspective view of the weir plate of FIG. 9;

FIG. 11 is a sectional view of the weir plate of FIG. 9;

FIG. 12 is a side view of the weir plate of the embodiment in which the end face of the butt end is closed with a closing material.

FIG. 13 is a perspective view of the weir plate of FIG. 12;

FIG. 14 is a cross-sectional view of the weir plate of FIG. 12;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Weir plate, 2... Flat plate, 3... Reinforcement strip, 4... Hollow part, 5... Corrugated plate, 6... Closing part, 7... Fitting protrusion, 8... End reinforcement material, 9
...Occluder.

Claims (2)

[Claims] Claim 1: A weir plate for formwork made of synthetic resin, in which two opposing flat plates constituting both the front and back surfaces are connected by a plurality of reinforcing strips arranged in parallel in one direction, and a hollow portion is provided between the reinforcing strips. A weir board for formwork of concrete structures, which is characterized by the ability to 2. The weir plate for formwork of a concrete structure according to claim 1, characterized in that the end surface of the end face where the hollow portion opens is closed.