JPH04285265A - Cylindrical die frame for reinforced concrete structure - Google Patents

Abstract

PURPOSE:To save labor during build-up of a die frame at a job site, by sing a cylindrical die frame formed from a corrugated hollow panel which can facilitate curving and drilling. CONSTITUTION:The inside space of a hollow panel 4 made of a polymer compound such as polypropylene, polycarbonate or vinyl chloride, is partitioned into several cavities 7 in parallel by rigs 6 coupling both surface plates 5a, 5b. This hollow panel 4 is formed into a cylindrical die frame with no joint by use of arcuated or circular weir plates so that the ribs 6 are directed to the center of the cylindrical section of the die frame. Then concrete 9 is placed so as to build a column.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to formwork for columns of reinforced concrete structures in the construction field.

0002

[Prior Art] Conventionally, cylinders of reinforced concrete structures,
The so-called round pillars are made by using a void formwork 1, which is a spiral tube made of paper, as shown in Figure 9, or by using thin plywood veneer 2, which is curved into a semicircle or a smaller arc, as shown in Figure 10. I do things like that. Reference numeral 3 in the figure indicates a shackling type reinforcing rib 3 for suppressing the lateral pressure of the void formwork 1 and the thin plywood veneer 2 during concrete pouring.

0003

In the void formwork 1 shown in FIG. 9, even if the number of reinforcing ribs 3 is increased, there is a problem in terms of strength as the diameter increases. Furthermore, when exposed to rain, etc., the formwork 1 itself contains water and loses its strength, making it unable to maintain its circular shape.
There is also a risk that it will become elliptical.

[0004] Even in the case of the thin plywood veneer 2 shown in FIG. 10, the number of reinforcing ribs 3, etc. is large, and it takes time and effort to manufacture the formwork. When making a concrete cylinder with a small diameter,
It is difficult to bend this thin plywood.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cylindrical formwork for reinforced concrete structures that is lightweight, strong, and easy to process and assemble, eliminating the disadvantages of the prior art.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention uses a polymer compound such as polypropylene, polycarbonate, or vinyl chloride as a material, and partitions the internal space with ribs to form a large number of cavities in one direction. The cylindrical body is made up of a weir plate made by bending a synthetic resin corrugated hollow panel into an arc or a circle so that the ribs face the center of the cross section of the cylinder, and the synthetic resin corrugated hollow panel has an edge. In addition, the polymer compound must be translucent and the hollow panel must be transparent, or similarly, polypropylene, polycarbonate, chloride, etc. A shackle-type hollow panel made of a polymer compound such as vinyl, partitioned into an internal space with ribs, and formed with a large number of cavities in one direction, which are overlapped and bonded as appropriate to allow the weir plate to pass through. A reinforcing rib is formed, a tightening rod such as a separator is passed horizontally through the reinforcing rib and the formwork weir plate, a single pipe and a rib seat are placed on the side of the reinforcing rib, and the end of the tightening rod is connected to a nut. The purpose is to stop it.

[0007]

[Function] According to the present invention as set forth in claim 1, the synthetic resin corrugated hollow panel used as a weir plate for formwork is hollow and therefore lightweight, and the ribs that partition the internal space make it possible to avoid conventional plywood veneer or voids. It is stronger than a formwork, and can be bent into an arc or circle at any time during manufacturing, regardless of the diameter, so no effort is required.

According to the present invention as set forth in claim 2, in addition to the effect set forth in claim 1, the degree of freedom in assembling on site is increased by joining the joints.

According to the third aspect of the present invention, in addition to the above-mentioned effects, since the weir plate is transparent, the filling properties of concrete can be visually observed, and the occurrence of junkers and the like can be prevented.

According to the present invention as set forth in claim 4, the reinforcing ribs of the shackle type can also be made of the same material as the weir plate, and the reinforcing ribs can further improve the strength and can penetrate the tie rods such as separators. Processing such as drilling holes is easy, so labor-saving construction can be achieved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional plan view showing a first embodiment of a weir plate for a columnar formwork for a reinforced concrete structure according to the present invention, and numeral 4 in the figure is a corrugated cardboard-like hollow panel made of synthetic resin. The panel 4 has an interior space partitioned in parallel by ribs 6 that connect double-sided plates 5a and 5b, and a large number of cavities 7 extending in one direction.
It is made of a polymer compound such as polypropylene, polycarbonate, or vinyl chloride, and is obtained by blow molding or extrusion molding. Incidentally, the appropriate thickness of the synthetic resin sheet forming the hollow panel 4 is about 1.5 mm.

Furthermore, if the polymer compound is made to have light-transmitting properties, this hollow panel 4 made of a synthetic resin sheet can also be made to have transparency. Further, for the purpose of increasing strength, glass fiber, calcium silicate, etc. may be mixed.

This hollow panel 4 is bent into an arc or a circle so that the rib 6 faces the center of the cross section of the cylinder to be constructed. In the example shown in FIG. 1, the synthetic resin corrugated hollow panel 4 is In this case, the cylinder is formed by pouring concrete 9 and constructing the cylinder.

FIG. 2 shows a second embodiment of the present invention.
When forming the hollow panel 4 into a cylindrical shape, a joint 10 is formed at the end portion curved into an arc or circular shape, and the joints 10 are joined together with a joining member 11 such as a joint bar interposed therebetween. Figure 3
As shown in the figure, the joint 10 is cut at the center of the cavity 7 formed between the ribs 6, and the lug portion is used, and the joining member 11 is inserted between the lug pieces and fixed with adhesive or the like. Bye.

FIG. 4 shows another example of the joint 10, and as in the case of FIG. ,
The ear portions may be bent outward and inward so that they fit directly into each other. This fitting portion is fixed with adhesive, welded, or crimped.

Furthermore, when joining the ends of the hollow panels 4 with the joints 10 in this way, the hollow panels 4 are bent into a semicircle as shown in FIG. 5, and joined at two places on the left and right to form a cylinder. Although not shown, it is also possible to increase the number of joints by making it a body or dividing it into three or four parts. Particularly when constructing a cylinder with a large diameter, a plurality of hollow panels 4 curved in an arc shape as described above are joined together to form a cylinder.

Further, as shown in FIG. 6 as a third embodiment, a plurality of these synthetic resin corrugated hollow panels 4 (two in the figure) are stacked together to form a more rigid synthetic resin dam plate. It can also be configured. In this case, the stacked hollow panels 4 may be bonded to each other with an adhesive or the like to form two stacked panels, or may be integrally molded in advance so that the cavities 7 are arranged in two vertical stages.

FIGS. 7 and 8 show an example of installing a weir plate for formwork according to the present invention, in which a reinforcing rib 12 similar to that shown in FIG. 9 is interposed on the outer periphery of the weir plate. Like the hollow panel 4, polypropylene, polycarbonate,
It is constructed of a corrugated cardboard-like hollow panel 13 made of synthetic resin made of a polymer compound such as vinyl chloride, with an internal space partitioned by ribs 6, and a large number of cavities 7 extending in one direction. This hollow panel 13 is a flat plate, and a plurality of panels (three panels in the figure) are bonded together using an adhesive or the like and stacked one on top of the other.

When joining the hollow panels 13 in an overlapping manner, it is desirable to take care that the directions of the ribs 6, that is, the directions of the cavities 7, intersect with each other in the vertically adjacent hollow panels 13.

The reinforcing rib 12 of the shackle type is passed through the cylindrical weir plate made of the synthetic resin corrugated hollow panel 4, and the method is the same as that of the conventional formwork assembly method.
A tightening rod 14 such as a separator is attached to the reinforcing rib 12 and the weir plate.
A single pipe 15, which is a butterfly pipe, and a rib seat 16 are arranged on the side of the reinforcing rib 12, and the end of the tightening rod 14 is fixed with a nut 17. Although not shown in the drawings, the fastening rods 14 can be formed using a normal formwork tightening means for plywood formwork, such as a combination of separators and home ties.

[0021]

Effects of the Invention As described above, the formwork for columns of reinforced concrete structures of the present invention is lightweight, easy to assemble and process, and can deal with slag generated during concrete pouring. Since it is easy to perform processing such as drilling and drilling holes, it is possible to save labor in constructing formwork on site.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view showing a first embodiment of a weir plate for a column formwork for a reinforced concrete structure according to the present invention.

FIG. 2 is a cross-sectional plan view showing a second embodiment of a weir plate for a columnar formwork for a reinforced concrete structure according to the present invention.

FIG. 3 is a cross-sectional plan view of a joint by a joint.

FIG. 4 is a cross-sectional plan view showing another example of a joint using a joint.

FIG. 5 is a cross-sectional plan view of the third embodiment.

FIG. 6 is a cross-sectional plan view of the fourth embodiment.

FIG. 7 is a plan view of the formwork installed.

FIG. 8 is a side view of the formwork installed.

FIG. 9 is a perspective view showing a conventional example.

FIG. 10 is a perspective view showing another conventional example.

[Explanation of symbols]

1...Void formwork 2...
Plywood veneer 3…Reinforcement rib
4...Hollow panel 5a, 5b...Front plate
6...Rib 7...Cavity
8...Reinforcement bar 9...Concrete 10...Joint 11...Joining member 12...Reinforcement rib 13...Hollow panel

Claims (4)

[Claims] [Claim 1] Polypropylene, polycarbonate,
A synthetic resin corrugated hollow panel made of a polymer compound such as vinyl chloride, with ribs dividing the internal space and many cavities in one direction, is shaped into an arc or circular shape so that the ribs face the center of the cylindrical cross section. A cylindrical formwork for a reinforced concrete structure, characterized in that the cylindrical body is composed of curved weir plates. 2. The formwork for a column for a reinforced concrete structure according to claim 1, wherein the synthetic resin corrugated hollow panel has joints formed at its ends, and the joints are joined together to form a cylindrical body. 3. The formwork for a column for a reinforced concrete structure according to claims 1 and 2, wherein the polymer compound has translucency and the hollow panel has transparency. [Claim 4] Polypropylene, polycarbonate,
Made of a polymer compound such as vinyl chloride, the internal space is partitioned with ribs, and a synthetic resin corrugated hollow panel with many cavities in one direction is arranged in an arcuate or circular shape so that the ribs face the center of the cross section of the column. A cylindrical formwork was formed using curved weir plates, which were also made of polymeric compounds such as polypropylene, polycarbonate, and vinyl chloride, and the internal space was partitioned with ribs, forming many cavities in one direction. Flat synthetic resin corrugated hollow panels are overlapped and bonded as appropriate to form a shackle-type reinforcing rib through which the weir plate passes, and a tightening rod such as a separator is passed horizontally through the reinforcing rib and the formwork weir plate. A formwork for a column of a reinforced concrete structure, characterized in that a single pipe and a rib seat are arranged on the side of a reinforcing rib, and the end of this tie rod is fixed with a nut.