JPH06200621A - Formwork for concrete and member for forming formwork for concrete - Google Patents

Abstract

(57) [Summary] (Modified) [Structure] A concrete formwork that is buried in concrete when it is poured and is removed after solidification of the concrete to form grooves or through holes in the concrete. A concrete formwork 1 and a single sheet characterized by comprising a triangular tube or a group of triangular tubes in which a plurality of triangular tubes 6a to 6c are integrally connected by bending the sheet, and Provided is a member for forming a concrete formwork, characterized in that a sheet is provided with a fold for forming a triangular tube or a set triangular tube in which a plurality of triangular tubes 6a to 6c are integrally connected. [Effect] According to the concrete formwork and the formwork forming member of the present invention, the formwork has a strength sufficient to withstand concrete pouring, and at the same time, the formwork can be easily formed at the construction site and the groove for the concrete is formed. The formation and the formation of through holes can be easily dealt with, and the manufacturing cost is low, which is advantageous in terms of storage space and transportation cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete formwork used for forming a groove or a through hole in concrete when it is buried in concrete during concrete pouring and removed after solidification of concrete. It relates to a member used for doing.

[0002]

2. Description of the Related Art Conventionally, a paper cylindrical formwork has been often used for forming grooves and through holes for passing pipes, cords and the like in a concrete structure such as a concrete floor.

[0003]

However, the cylindrical formwork has to be manufactured in a production factory in advance and transported to the construction site, which is inconvenient because the formwork cannot be formed on the construction site. Since the cylindrical mold of the seed has a large volume corresponding to the hollow portion, it requires a large storage space, and there is a problem that the transportation cost is high for the weight. In addition, the cylindrical form is particularly advantageous for forming circular through holes in concrete, but when forming grooves on the concrete surface, it must be used in half, and in this case cutting is troublesome. There is a drawback that.

The present invention has been made in view of the above circumstances.
In addition to having sufficient strength for concrete pouring, it can easily form a formwork at the construction site, can easily respond to the formation of grooves and through holes in concrete, and the manufacturing cost is low, and it is a storage space. An object of the present invention is to provide a concrete formwork and a member for forming the formwork that are also advantageous in terms of transportation cost.

[0005]

In order to achieve the above-mentioned object, the present invention is a mold for concrete which is embedded in concrete for pouring at the time of concrete pouring and is removed after solidification of concrete to form grooves or through holes in the concrete. A frame for concrete, comprising a triangular cylinder or a collective triangular cylinder in which a plurality of triangular cylinders are integrally connected by bending a single sheet.

The present invention also comprises a single sheet,
Further, there is provided a formwork forming member for concrete, characterized in that the sheet is provided with a fold for bending and forming a triangular tube or a group of triangular tubes in which a plurality of triangular tubes are integrally connected.

In this case, a corrugated board made of paper or plastic is preferably used as the sheet.

[0008]

The concrete formwork of the present invention is used to form a groove or a through hole in concrete when it is embedded in concrete during concrete pouring and removed after solidification of concrete. The sheet is bent to form a triangular tube or a collective triangular tube, and since the triangular tube is the basic structure in this way, it has sufficient strength for concrete pouring, so that it buckles and deforms. Such inconvenience is unlikely to occur. That is, if a square tubular shape or a polygonal tubular shape having a larger size is used as a basic structure, there is a problem that it is easily deformed due to a stress in the side direction. If you use such a basic configuration,
The mold has to have sufficient strength so as not to be deformed by the stress in the lateral direction, and in particular, each corner should be manufactured so as to be immovable, but the mold based on the triangular tube of the present invention is a basic structure. Since the frame itself has a sufficient strength itself, even if the mold of the present invention is manufactured from a corrugated board, there is no problem in strength when pouring concrete.

Since the formwork of the present invention can be manufactured by bending a single sheet, the formwork can be easily formed at the construction site. In this case, a groove or a through hole is formed in concrete. It is possible to easily form an appropriate mold according to the size, shape, etc.
It can be easily adapted to the requirements of the construction site.

Further, since the formwork of the present invention is formed from a single sheet, its manufacturing cost is low, and it does not take up any storage space before the formwork is formed. Therefore, the total cost can be significantly reduced.

In particular, when the sheet is formed of a corrugated board, it is lightweight, easy to handle, the on-site formation of the mold is easier, and the cost can be further reduced.

Further, the concrete formwork forming member of the present invention can easily form a formwork having the above-mentioned advantages, and since this member is formed of a sheet, its creases are formed. It is easy to cut along it (especially corrugated board can be easily cut), and therefore, the folds are cut as appropriate according to the demands of the construction site and used as a collection triangular tube of the desired shape. And if necessary,
It has the additional advantage that it can also be used in the form of square cylinders or more polygonal cylinders.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a concrete formwork 1 according to an embodiment of the present invention. The formwork 1 is formed from a formwork forming member 2 shown in FIGS. This member 2 has seven folds 3a to 3g formed on the corrugated board 3 by forming six folds 4a to 4f on one surface (outer surface) of the paper or plastic corrugated board 3 that are equally spaced from each other. And a water-repellent waterproof layer 5 made of paraffin wax, silicone resin or the like is formed on the one surface, and the central partition 3
The partition pieces 3a to 3c and 3e on both sides of d
By folding 3g inward along the respective folds 4a to 4f, as shown in FIG.
A form 1 having a triangular trapezoidal shape in which a to 6c are integrally connected and having a trapezoidal plane as a whole is formed. After the member 2 is bent in this way to form a collective triangular tube, the adhesive tape 7 is attached between the partition pieces 3b and 3f, whereby the collective triangular tube is fixed in the shape.

The mold 1 according to this embodiment is composed of three triangular triangular cylinders 6a to 6c integrally connected to each other and is composed of a flat triangular trapezoidal cylindrical triangular cylinder. Even if this formwork 1 is made of corrugated board,
It is difficult to buckle or deform when placing concrete. That is, this formwork 1 is composed of the partition pieces 3 arranged inside.
a and 3g act as a reinforcing plate and prevent the formwork 1 from buckling and deforming due to external stress.

The mold 1 is, as shown in FIG.
It is preferably used to form a groove on the surface of concrete, and it is placed at a required place where a groove should be formed with respect to the concrete at the concrete pouring place, then concrete 8 is poured, and the concrete 8 solidifies. After that, it is to be removed from the concrete 8.
The trapezoidal groove corresponding to the entire shape of is formed.

In this case, since the water repellent waterproof layer 5 is formed on one surface (outer surface) of the mold 1, it is difficult for water generated by pouring concrete to penetrate into the mold 1.

Further, since this formwork 1 is formed by simply bending one corrugated board as described above and fixing the partition pieces 3b and 3f with the adhesive tape 7, it is possible to construct the formwork 1 at the construction site. It is easy to assemble, and because it is made of cardboard, it is lightweight and very easy to handle.

The form of the present invention and the members forming the form are not limited to those shown in the drawings, and the triangular cylinder can be modified in various ways such as an isosceles triangle and a right triangle, in addition to the regular equilateral triangle. For example, in the formwork of FIG. 1, each triangular tube may have a plane isosceles triangular shape, or as shown in FIG. 5, two triangular tubes 6a and 6b are integrally connected to each other to form a plane square shape. It may be a triangular tube, or may be formed by only one triangular tube in some cases. In this case, a member in which a fold is formed on one thick plate may be prepared so as to form such a triangular cylinder or a collective triangular cylinder, but the members shown in FIGS. However, it is also possible to form a desired triangular cylinder or aggregate triangular cylinder.

Further, in the above embodiment, the folds are formed on only one surface of the corrugated cardboard, but the fold forming surface can be appropriately selected depending on the overall shape of the assembly triangular tube, and the water-repellent waterproof layer is formed on both surfaces. However, other configurations may be variously modified without departing from the gist of the present invention.

[0020]

EFFECTS OF THE INVENTION According to the concrete formwork and the formwork forming member of the present invention, the formwork can be easily formed on the construction site while having strength enough to endure concrete pouring, It is possible to easily deal with the formation of the groove and the formation of the through hole, and the manufacturing cost is low, which is advantageous in terms of storage space and transportation cost.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a concrete formwork of the present invention.

FIG. 2 is a plan view showing an example of the same mold forming member.

FIG. 3 is a front view of the same example.

FIG. 4 is a partially omitted partial cross-sectional view of a state where concrete is cast using the formwork of FIG.

FIG. 5 is a plan view showing another embodiment of the concrete formwork of the present invention.

[Explanation of symbols]

 1 Concrete formwork 2 Formwork forming members 3a to 3g Partition pieces 4a to 4f Folds 5 Water repellent prevention layer 6a to 6c Regular triangular tube 7 Adhesive tape 8 Concrete

Claims (4)

[Claims] 1. A concrete formwork that is buried in concrete when it is poured and is removed after solidification of the concrete to form grooves or through holes in the concrete, wherein one sheet is bent. A concrete formwork characterized by comprising a triangular tube or a set of triangular tubes integrally connected to each other. 2. The formwork according to claim 1, wherein the sheet is a corrugated board. 3. A fold for forming a triangular cylinder or a set triangular cylinder in which a plurality of triangular cylinders are integrally connected to each other is formed by bending the single sheet. Item 1. A member for forming a concrete formwork according to item 1. 4. The member according to claim 3, wherein the sheet is a corrugated board.