JP2652111B2 - Formwork for prism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced concrete structure in the construction field, and a square pillar formwork of a steel frame / reinforced concrete structure.

[0002]

2. Description of the Related Art Conventionally, a plywood veneer is generally used as a dam for a formwork. The plywood veneer has a considerable weight in the case of large dimensions, and is difficult to handle manually. In addition to the plywood veneer form, there is also a metal formwork made of steel or aluminum, which is heavier than the plywood veneer and is more difficult to handle manually.

[0003] A plywood veneer or a metal formwork is used as a formwork for reinforced concrete or a steel-framed reinforced concrete square pillar by casting it into concrete, but four flat molds of any size are used. The frame panel is assembled in a tubular shape on the front, rear, left and right sides to obtain a design cross section.

[0004]

Since the size of the formwork panel itself is determined in the above-mentioned metal formwork, in order to obtain a predetermined design cross-section, it becomes a special order product each time, and it is poor in versatility and cost. It will be high. On the other hand, a plywood veneer formwork can be cut to any size, but since the four pieces are assembled so that their mutual ends abut at the corner, the strength at this corner is weak. , And the mold is easy to be burred at this portion.

An object of the present invention is to provide a prismatic formwork which solves the above-mentioned disadvantages of the prior art, is lightweight, has strength, and is easy to process and assemble.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a cardboard hollow dam made of synthetic resin in which front and rear face plates are integrally connected by a plurality of reinforcing strips arranged in parallel along the longitudinal direction. The plate is made of a translucent polymer compound such as polypropylene, polycarbonate, and vinyl chloride and has transparency, and a cut is made in one face plate of the hollow weir plate, and the other face plate facing the cut is bent. The weir plate is bent into a substantially L-shape, and the four substantially L-shaped weir plates are joined to form a tubular body having a rectangular cross section by abutting the ends thereof, or the gap between the face plates constituting the front and back surfaces is formed. The corrugated hollow corrugated board made of synthetic resin integrally connected by a plurality of reinforcing strips arranged in parallel in the longitudinal direction is made of a translucent polymer compound such as polypropylene, polycarbonate, and vinyl chloride, and has transparency. A cut is made in one face plate of the hollow weir plate, and the other face plate opposing the cut is bent to form a substantially U-shaped weir plate. The gist of the invention is that they are combined as a tubular body having a rectangular cross section.

[0007]

According to the first or second aspect of the present invention, the synthetic resin corrugated cardboard-shaped hollow weir plate used as the mold is lightweight because it is hollow. In addition, the weir plate has a smooth surface and a good releasability from concrete, so that the smoothness of the molded concrete surface can be improved, and at the same time, the number of rotations can be increased.

In this synthetic resin corrugated cardboard-shaped hollow weir plate, the other face plate opposing the cut is bent to bend the weir plate. At this time, the bent part of the face plate serves as a hinge, and is easily formed. Can compose. In addition, the face plates are not joined at any corners, and the corners can be maintained in a watertight manner as an integral part, so that there is less burr at this portion due to the concrete pressure to be poured.

A corrugated hollow weir board made of synthetic resin is
Since it has transparency, it is possible to visually check the filling property of concrete, and it is possible to prevent the occurrence of junkers and the like.

[0010] In particular, according to the present invention, the cylindrical body having a rectangular cross section does not require four dam plates.
It is easy to assemble with a smaller number.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional plan view showing a first embodiment of a prismatic formwork of the present invention, where 1 is a hollow weir plate.

As shown in FIG. 3, the hollow weir plate 1 is a corrugated cardboard panel made of a synthetic resin and includes a plurality of reinforcing strips 1c arranged in parallel in the longitudinal direction between face plates 1a and 1b constituting the front and back surfaces. They were integrally connected. This is made of a polymer compound such as polypropylene, polycarbonate, or vinyl chloride, and can be obtained by blow molding or extrusion molding. Incidentally, the thickness of the synthetic resin sheet forming the hollow weir plate 1 is suitably about 1.0 mm.

Further, if the polymer compound is translucent, the hollow weir plate 1 made of a synthetic resin sheet can also be made transparent. Further, for the purpose of increasing the strength, glass fiber, calcium silicate or the like may be mixed.

In this way, the hollow weir plate 1 is
The inner space is partitioned in parallel by a reinforcing strip 1c connecting the a and 1b, and a large number of cavities are formed in one direction.
As shown in (1), a cut 2 in the longitudinal direction to reach this cavity is made in one face plate 1a in advance at a factory or a site.

Then, as shown in FIG. 4, the other face plate 1b opposed to the cut 2 is bent inside with a jig 3 made of a square material inside to bend the entire dam plate 1 into a substantially L-shape.

At this time, the bent portion 4 of the face plate 1b serves as a hinge and can be easily bent, and when transported, the substantially weir-shaped bent dam plate 1 is flattened again as shown in FIG. You can carry it back in the shape. When transported in the form of a flat plate, a large number of sheets can be stacked and transported.

At the time of use, the weir plate 1 is returned to a substantially L-shape, and the four weir plates 1 bent into the substantially L-shape are joined together as a cylindrical body having a rectangular cross section by abutting their ends. Arrange the column clamps appropriately in the shape of a tub, and restrain them with this.

FIG. 2 shows a second embodiment of the present invention.
Two cuts 2 are provided at intervals, and the other face plate 1b opposed to the cut 2 is bent inside with a jig 3 made of square material inside to bend the entire dam plate 1 into a substantially U-shape. In this case, two substantially U-shaped weir plates are combined into a tubular body having a rectangular cross section by abutting the ends thereof.

In both the first and second embodiments, the assembled formwork has a corner portion because the bent portion 4 of the other face plate 1b facing the cut 2 serves as a hinge and the face plate 1b is integrally continuous. The watertightness can be maintained at this point, and the burr at this part due to the concrete pressure to be poured can be reduced.

Further, since the weir plate 1 has transparency, the filling property of the concrete can be visually checked, and the occurrence of junkers and the like can be prevented.

[0021]

As described above, the prismatic formwork of the present invention is lightweight, strong, and easy to process and assemble.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view showing a first embodiment of a prism form according to the present invention.

FIG. 2 is a cross-sectional plan view showing a second embodiment of a prism form according to the present invention.

FIG. 3 is a perspective view showing a first step of processing.

FIG. 4 is a perspective view showing a second step of processing.

FIG. 5 is a perspective view during transportation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Hollow weir board 1a, 1b ... Face plate 1c ... Reinforcement strip 2 ... Cut 3 ... Jig 4 ... Bending part

Continuing on the front page (72) Inventor Shinnosuke Aiba 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yukimasa Ogihara 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction (72) Inventor Yasuo Okawa Kashima Construction Co., Ltd. 1-2-7 Moto-Akasaka, Minato-ku, Tokyo (56) References JP-A-63-97759 (JP, A) JP, U) JP-A 3-9467 (JP, U) JP-A 61-115434 (JP, U) JP-A 59-24848 (JP, U)

Claims (2)

(57) [Claims] 1. A synthetic resin corrugated cardboard-shaped hollow weir plate integrally connected by a plurality of reinforcing strips parallel to each other in the longitudinal direction between face plates constituting the front and back surfaces, is made of a light-transmitting material such as polypropylene, polycarbonate, and vinyl chloride. A cut is made in one face plate of this hollow weir plate, and the other face plate opposed to the cut is bent into a substantially L-shape, and the weir plate is bent into a substantially L-shape. A square pillar formwork comprising four rectangular shaped weir plates joined together at their ends with a cylindrical body having a rectangular cross section. 2. A synthetic resin corrugated cardboard-shaped hollow weir plate integrally connected by a plurality of reinforcing strips parallel to each other along the longitudinal direction between the front and rear face plates, and is made of a light-transmitting material such as polypropylene, polycarbonate, or vinyl chloride. A cut is made in one face plate of this hollow weir plate, and the other face plate opposing the cut is bent into a substantially U-shape to form a cutout in the hollow weir plate. A square pillar formwork comprising two rectangular shaped weir plates joined together at their ends with a cylindrical body having a rectangular cross section.