JPH07329043A - Extrusion die for permanent formwork for concrete - Google Patents

Abstract

(57) [Summary] [Purpose] Extrusion of a permanent formwork for concrete that allows continuous production of a rough surface to improve adhesion to concrete in a concrete formwork for concrete construction, and that is easy to maintain and inspect. The purpose is to obtain a forming die. [Structure] A mold 1 for extrusion-molding a fiber-reinforced cement plate-shaped body (1A) having a rough surface, which is provided near the tip (2A) of the mold inner surface corresponding to the rough surface. The plate (3) having the rough surface or the plate (3) having the hard particles (4) on the surface (3A) is provided, or the plate-like body (1A) is provided at a position corresponding to the rough surface. It is configured by providing plate members (5) ... (5) that extend to the front surface side and are in contact therewith.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion molding die for a permanent mold for concrete.

[0002]

2. Description of the Related Art Conventionally, a permanent formwork made of fiber reinforced cement for concrete construction has been proposed, and it has been proposed to use it instead of a conventional plywood formwork (for example, Japanese Patent Laid-Open No. 3-2934).
No. 73 bulletin).

This type of concrete formwork is finally integrated with the concrete to be cast, and the formwork is directly integrated with the walls or columns of the building structure, so that the subsequent frame removing work can be omitted. Have advantages. By the way, the above-mentioned permanent formwork for concrete construction is provided with a ridge on the back surface in order to improve the adhesion with the concrete to be poured, or in order to further improve the adhesion, these surfaces are roughened and physically The adhesion is also improved.

[0004]

However, in order to improve the adhesion to the concrete to be poured, the above-mentioned rough surface is not regular unevenness but irregular unevenness, in particular, a rough surface with fluffing reinforcing fibers. However, it takes a relatively long time to form such a rough surface, and there is a drawback that productivity is poor.
That is, in the case of extrusion molding, when comb-teeth-shaped teeth are provided at the ejection port of the molding die, it is difficult to form parallel irregular grooves by comb teeth, but it is difficult to form an irregular rough surface. There is a drawback that the reinforcing fibers are caught on the comb teeth and it takes time to remove them.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention is capable of continuously producing a rough surface for improving the adhesion to concrete in a permanent formwork for concrete work, and also for maintenance and inspection. It was made for the purpose of obtaining an easy extrusion molding die for a permanent mold for concrete.

[0006]

That is, the extrusion die of the permanent mold for concrete of the present invention is a die 1 for extruding a fiber-reinforced cement plate-like body (1A) having a rough surface. It is characterized in that a plate (3) having a rough surface is provided near the tip (2A) of the inner surface of the mold corresponding to the rough surface portion. The plate having a face is a plate having hard particles (4) on the surface (3A),
And a third invention is a die 1 for extrusion-molding a fiber-reinforced cement plate-shaped body (1A) having a rough surface, wherein the plate is provided at a position corresponding to the rough surface portion. Plate member (5) extending to the surface side of the strip (1A) and in contact therewith
... (5) is provided.

[0007]

Embodiments of the present invention will be described below. 1 is a sectional view of an embodiment of the invention according to claim 1, FIG. 2 is a front view of the embodiment, FIG. 3 is a perspective view of a permanent formwork for concrete molded by this embodiment, and FIG. FIG. 5 is a sectional view of an embodiment of the invention according to FIG. 5, and FIG. 5 is a front view of the embodiment.

The extrusion molding die (1) for a permanent mold for concrete of the present invention is a mold (1) for extrusion molding a fiber-reinforced cement plate-shaped body (1A) having a rough surface (1B).
In the vicinity of the tip (2A) of the inner surface of the mold (1) corresponding to the portion to be the rough surface (1B), a plate (3) having a rough surface is provided as shown in a partially enlarged view. It is configured. The roughened plate (3) is made of a hard metal plate such as chrome molybdenum steel, a ceramic plate or silicon nitride having irregular irregularities on its surface, and the surface (3A) has a grain size of 0.1 to 2 mm. Diamond grains,
The plate (3) may be formed by forming hard particles (4) such as zirconium particles or silicon nitride particles in a film shape by plating, painting or thermal spraying.

In the above embodiment, the plate (3) is fixed near the tip (2A) of the die so that only surface irregularities or hard particles (4) project into the cross section of the die. Further, when the plate (3) is provided at a position corresponding to it as shown in FIG. 2 when partially provided as in the molded product shown in FIG. 3, the entire surface of the product is a rough surface. In this case, it may be provided over the entire inner surface of the mold.

Further, instead of the plate (3), it may be constructed as shown in FIG. 4 or 5. That is,
The fiber-reinforced cement plate-shaped body (1A) is extruded to the surface of the fiber-reinforced cement plate-shaped body (1A) at a position corresponding to the rough surface (1B) of the die 1 for extrusion molding. Plate members (5) ... (5) are provided.

In the above embodiment, the plate members (5) ...
Contact end (5A) in contact with the cement kneaded product (S) of (5)
As shown in the partially enlarged view of FIG. 4, it is desirable to have a knife edge shape with an acute angle θ smaller than the angle of 90 °. With such a knife-edge shape, a turbulent flow is generated on the surface of the extruded molding material and the surface is roughened so that the surface becomes naturally rough. In particular, when reinforcing fibers are mixed in the cement kneaded material (S), the fibers are caught on the contact ends (5A), so that a rough surface is more likely to be formed.

[0012]

When the fiber-reinforced cement kneaded product is extrusion-molded by the extrusion mold die (1) of the permanent mold for concrete of the present invention, the plate is produced in the case of the extrusion die of the permanent mold for concrete according to the invention of claim 1. In the portion where (3) is arranged, the surface of the extruded product is roughened by the hard particles, and thereby the corresponding surface becomes a rough surface. At this time, the fibers and the like contained in the particles are caught, resulting in an at random rough surface.
Moreover, since the amount of protrusion of the particles is very small, there is no possibility that the fibers are caught in this and clogged.

In the case of the extrusion die of the permanent mold for concrete according to the invention of claim 2, turbulent flow is generated on the surface of the extruded article due to the influence of the tip of the plate member (5) to roughen the surface naturally. It becomes the state of. In particular, when reinforcing fibers are mixed in the cement kneaded material (S), the fibers are caught on the contact ends (5A), so that a rough surface is more likely to be formed.

[0014]

As described above, according to the extrusion molding die of the permanent mold for concrete of the present invention, the plate (3) or the plate member (5) is attached to the inner surface or the discharge port of the molding die and the extrusion is performed as it is. Just by molding
It is possible to mold a permanent mold for concrete whose surface is rough, and it is possible to manufacture a concrete permanent mold with a rough surface by the same process and production means as before. Also, since the replacement parts are small, maintenance and management are easy, and various effects are obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the invention according to claim 1.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a perspective view of a permanent mold for concrete molded according to an embodiment.

FIG. 4 is a sectional view of an embodiment of the invention according to claim 2.

FIG. 5 is a front view of the embodiment.

[Explanation of symbols]

 (1) ... Extrusion molding die for permanent formwork for concrete (1A) ... Fiber reinforced cement plate (1B) ... Rough surface (2A) ... near tip of inner surface of mold (3) ... plate (3A) ... plate Surface (4) ... Hard particles (5) ... Plate member

Claims (3)

[Claims] 1. A mold 1 for extrusion-molding a fiber-reinforced cement plate-shaped body (1A) having a rough surface, which is near the tip (2A) of the inner surface of the mold corresponding to the rough surface. )
An extrusion molding die for a permanent formwork for concrete, characterized in that a plate (3) having a rough surface is provided on the. 2. A mold 1 for extrusion-molding a fiber-reinforced cement plate-shaped body (1A) having a rough surface, which is near the tip of the inner surface of the mold (2A corresponding to the rough surface). )
An extrusion molding die for a permanent formwork for concrete, characterized in that a plate (3) having hard particles (4) on the surface (3A) is provided on the surface. 3. A mold 1 for extrusion-molding a fiber-reinforced cement plate-shaped body (1A) having a rough surface, wherein the plate-shaped body (1A) is located at a position corresponding to the rough surface. 1A) is provided with plate members (5) ... (5) which extend and contact the surface side, and an extrusion molding die for a permanent mold for concrete.