JP2000008609A - Concrete form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide concrete forms having lightweight properties and high rigidity and being handled more simply. SOLUTION: The concrete forms 10 are constituted in rear opening type box structure of a molding plate 1 for molding a concrete surface and frames 3 annexed to the rear of the molding plate in a casing shape. The molding plate 1 is composed of a composite plate, in which metallic sheets are joined on both surfaces of a synthetic resin sheet, and the peripheral section of the molding plate 1 is bent under the state, in which the outer circumferential surfaces of the frames 3 are covered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete formwork, and more particularly, to a concrete formwork for forming an outer shape of a concrete structure, which is lightweight, has high rigidity, and is handled. Relates to a simpler concrete formwork.

[0002]

2. Description of the Related Art As concrete forms used in the fields of civil engineering and construction, various forms using synthetic resin as a material have been proposed in order to solve the problem of durability of conventional wooden forms. . The present inventors have already applied for a concrete form made of synthetic resin. Such a concrete formwork is composed of a front forming member in which a plurality of girder forming pieces are integrally provided on one surface side, and a back forming member in which a plurality of girder forming pieces are integrally provided on one surface side, and both. (See Japanese Patent Application Laid-Open No. 8-15838).

[0003]

By the way, in order to reduce the weight of a concrete form made of synthetic resin, the thickness of the form must be reduced. There is a problem that the molding surface is bent. Therefore, in the case of a thin-walled formwork, as in the case of a wooden formwork, bending must be prevented by laying a reinforcing transverse member (so-called thick material) on the back side of the formwork. No. In addition, a concrete mold made of a synthetic resin is liable to damage the surface of the surface forming member, that is, a molding surface for molding concrete during assembly and dismantling, and is inconvenient to handle.

[0004] The present invention has been made in view of the above-mentioned circumstances, and has been made as a result of various studies on the material composition. It is an object of the present invention to provide a concrete formwork having light weight, high rigidity, and further easier handling. Is to do.

[0005]

Means for Solving the Problems To solve the above-mentioned problems, a concrete formwork of the present invention comprises a molded plate for molding a concrete surface, and a frame attached to the back surface of the molded plate in a frame shape. A concrete formwork configured in an open-back box structure, wherein the molded plate is formed by a composite plate formed by joining metal sheets to both surfaces of a synthetic resin sheet, and a peripheral edge of the molded plate is The frame is bent so as to cover the outer peripheral surface of the frame.

That is, in the above-mentioned concrete formwork, the formed plate made of a specific composite plate exhibits sufficient rigidity as compared with its thickness, and furthermore, the structure of the peripheral edge portion of the bent formed plate. Cooperates with the frame to further increase the bending rigidity of the formed plate. And the surface of the molded plate is
Since it is made of a metal sheet, it exhibits excellent durability.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a concrete formwork according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the entire shape of the concrete formwork of the present invention as viewed from the rear side. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1 and showing a bending structure of the formed plate and an arrangement of the frame along a thickness direction of the formed plate. FIG. 3 is a perspective view showing an example of a clip for connecting a plurality of concrete forms. FIG. 4 is a longitudinal sectional view showing an example of use of a concrete formwork. Hereinafter, in the description of the embodiment, the concrete form is abbreviated as “form”.

[0008] As shown by reference numeral (10) in Fig. 1, the formwork of the present invention comprises a forming plate (1) for forming a concrete surface,
Frame (3) attached in a frame shape on the back surface of the molding plate
Thus, a flat box structure with an open back is formed. From the viewpoints of rigidity, light weight, and ease of handling, the molded plate (1) is composed of a composite plate formed by joining metal sheets to both surfaces of a synthetic resin sheet. Is bent to cover the outer peripheral surface of the frame (3) (see FIG. 2).

The plane shape of the mold (10) is formed, for example, in a rectangular shape of about 600 mm × 1800 mm according to the specification in use, and the thickness of the mold (10) is about 40 to 100 mm, preferably 50 to 100 mm. It is set to about 80 mm. The frame (3) includes two so-called square pipe-shaped sections (31) each having a rectangular section arranged in the longitudinal direction, and an L-shaped section (32) arranged in the short direction. Are joined to form a framework structure. As such a frame (3), it is preferable to use an aluminum frame containing an aluminum alloy from the viewpoint of lightness and strength.

In the case of an aluminum frame (3),
The dimensions of the square pipe-shaped section (31) constituting this have a thickness of about 1 to 7 mm and an outer dimension of one side of about 15 to 70 mm in a cross section orthogonal to the longitudinal direction. The dimensions of the shape member (32) are such that one side in a cross section orthogonal to the longitudinal direction is about 15 to 100 mm, and the wall thickness is about 1 to 7 mm. Also, the pipes in the longitudinal direction of the frame (3)
A plurality of ribs (2) are bridged to prevent distortion of the entire formwork.

In the present invention, it is important that the molded plate (1) is constituted by the specific composite plate as described above. Core material of the composite board, that is, as a synthetic resin sheet, polyethylene, polypropylene and other polyolefins, polyvinyl chloride, polyamide, polycarbonate,
Thermoplastic resins such as polystyrene, polyhydroxyl ether, and vinyl acetate are used. Of course, a thermosetting resin may be used. From the viewpoint of weight reduction, foamed resin is preferable. The above-mentioned synthetic resin sheet is set to a thickness of about 1 to 15 mm. On the other hand, the metal sheets on both sides of the composite plate have a thickness of about 0.1 to 1.0 mm, usually about 0.3 to 0.5 mm in consideration of strength, weight and workability.

Each metal sheet is provided in a state of being sufficiently adhered to the synthetic resin sheet using an adhesive or the like. As the adhesive, ethylene-acrylic acid copolymer, ethylene-vinyl acetate copolymer, ethylene-glycidyl acrylate copolymer, ethylene-maleic anhydride copolymer,
Examples include graft-modified unsaturated carboxylic acids of polyolefins (such as polyethylene) or anhydrides thereof.
The adhesive is usually used by being laminated as an adhesive film on the surface of the synthetic resin sheet, but may be used by being compounded with the synthetic resin sheet. As the composite plate as described above, for example, a product “Alpolic” manufactured by Mitsubishi Chemical Corporation can be mentioned.

Further, as shown in FIG.
It is important that the periphery of the formed plate (1) is bent so as to cover the outer peripheral surface of the frame (3). Since the formed plate (1) is a composite plate made of the above-described material, it can be easily bent using an appropriate bending device. The frame (3) and the forming plate (1) are fastened by bolts or tapping screws (not shown) inserted from the outer surface of the periphery of the bent forming plate (1).

Further, in a preferred embodiment of the present invention, the adhesion of concrete is reduced on the surface of the molded plate (1),
A resin coating layer (not shown) for improving workability is provided. The coating layer is formed by attaching a synthetic resin film to the surface of the molded plate (1) or applying a coating to the surface of the molded plate (1). For example, as the synthetic resin film, an appropriate film that hardly adheres to concrete and can exhibit durability, for example, polyethylene, polyolefin resin such as polypropylene, polystyrene,
Films of various thermoplastic resins such as polyvinyl chloride can be used. In addition, the coating layer is further provided with a form (1).
0) may be formed on the outer surface, and the coating layer of such a portion may be used by connecting a plurality of molds (10).
It is possible to prevent sticking of concrete spilling out into minute gaps between the molds (10, 10).

Further, depending on the size of the structure, a plurality of molds (10) are connected and used, so a clip as a fastening material between the molds is attached to the mold (10) of the present invention. Fastening holes (4) are provided. As shown in FIGS. 1 and 2, the fastening hole (4) is provided on a side surface of the mold (10), that is, on a bent peripheral portion of the molded plate (1). The fastening hole (4) is composed of a hole (42) formed in the above-mentioned peripheral portion and a hole (43) penetrated through the frame (3) so as to overlap the hole.

The above-mentioned clip for fastening the molds is shown in FIG.
As shown by the reference numeral (5) in the figure, it is a bar-shaped processed product that is bent into a substantially rectangular shape with an open corner. Clip (5)
Are linear fastening portions (51) inserted into overlapping fastening holes (4, 4) of two adjacent molds (10, 10).
And an operation part (52) formed by bending from the fastening part.
And the operation unit (52) includes a fastening unit (51).
The holding side (52a) bent in a direction perpendicular to the direction and bent at an obtuse angle in the middle, and the operation side (52b) bent from the holding side (52a) in parallel with the fastening portion (51).
And a clamping side (52c) bent from the operation side (52b) and bent in the middle to the opposite side to the clamping side (52a).

That is, the clip (5) is
2a, 52c) is provided with a structure in which a corner portion is opened by the bent shape, and using such an opening, a fastening portion is provided in overlapping fastening holes (4), (4) of two adjacent formwork (10). After the insertion of (51), the operation side (52b) is turned upward or downward to operate the holding side (52a, 5).
2c) has a function of fastening the molds (10, 10) to each other.

Reference numeral (6) in FIG. 3 indicates an end of a ruler member called a so-called separator. The separator (6) is a member attached to maintain a constant distance between the molds (10, 10) arranged opposite to each other, and the separator (3) is a thin plate having an opened hole. Shaped tip is inserted between two adjacent forms (2, 2) and a clip (1)
Are locked by the fastening portion (11). Adjustment of the separation distance by the separator (3) is performed by rotating a cup screwed to the tip end side of the separator (3).

The method of using the formwork (10) of the present invention is substantially the same as the method of using the conventional formwork. For example, as shown in FIG. Are erected so that the surfaces of them face each other. Also, a plurality of connections are made in the horizontal direction according to the horizontal length of the structure (not shown). At that time, the formwork (1
0), the clip (5) shown in FIG. 3 is used as described above, and the opposite formwork (10, 1) is used.
The interval (0) (thickness of the concrete to be cast) is set using the separators (6) and / or (7). That is, in the construction using the formwork (10, 10), the formwork (10, 10) is erected so that the formed plates (1, 1) face each other, and the above-mentioned separators (6, 7) are provided in an appropriate number Only to define the distance between the forms (10, 10) and then cast concrete (8) between the forms (10, 10).

The mold (1) of the present invention used as described above
No. 0) is formed in an open-backed box structure by the forming plate (1), the frame (3) and the reinforcing ribs (2), so that it is excellent in lightness and arranged at a specific position. The frame (3), the reinforcing ribs (2), and the forming plate (1) cooperate to form a rigid body structure, so that the rigidity is excellent. In particular, the formed plate (1) constituted by the composite plate as described above exhibits sufficient rigidity as compared with its thickness, and the structure of the peripheral portion of the bent formed plate (1) is In cooperation with the frame (3), the bending rigidity of the formed plate (1) is further increased. Since the surface of the molded plate (1) is made of a metal sheet, the surface is not damaged like a resin and exhibits excellent durability.

That is, the formwork (10) of the present invention has light weight and high rigidity, and is less damaged and more convenient for handling. In addition, since the formwork (10) of the present invention can exhibit high rigidity while maintaining lightness, it is difficult to prevent bending of the molding surface as in the conventional construction. There is no need to install any material, and it is possible to assemble with only the clip (5) as described above, and it is possible to more easily construct a so-called form system that does not use thick materials.

[0022]

As described above, according to the concrete formwork of the present invention, a box structure of an open back type is provided, and a molded plate constituted by a specific composite plate is compared with its thickness. It exhibits sufficient rigidity, and furthermore, has a lightweight and high rigidity because the structure of the periphery of the bent formed plate cooperates with the frame to further increase the bending rigidity. Moreover, since the surface of the molded plate is made of a metal sheet, it exhibits excellent durability. Therefore, the concrete formwork of the present invention does not require the installation of a thick material on the back side, and can be more easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the entire shape of a concrete formwork according to the present invention as viewed from the rear side.

FIG. 2 is a sectional view taken along the line II-II in FIG. 1 and showing a bending structure of the formed plate and an arrangement of a frame along a thickness direction of the formed plate.

FIG. 3 is a perspective view showing an example of a clip for connecting a plurality of concrete forms.

FIG. 4 is a longitudinal sectional view showing an example of use of a concrete formwork.

[Explanation of symbols]

 1: molded plate 2: rib 3: frame 4: fastening hole 5: clip 6: separator 8: concrete 10: concrete formwork

Claims (3)

[Claims] A molded plate for forming a concrete surface (1)
And a frame (3) attached to the back surface of the forming plate in a frame shape, the concrete formwork (10) having a box structure of an open-back type, wherein the forming plate (1)
Is composed of a composite plate in which a metal sheet is joined to both sides of a synthetic resin sheet, and the peripheral edge of the molded plate (1) is bent so as to cover the outer peripheral surface of the frame (3). Characteristic concrete formwork. 2. Concrete formwork according to claim 1, wherein the frame (3) is an aluminum frame. 3. The concrete formwork according to claim 1, wherein a resin coating layer is provided on the surface of the molded plate (1).