JPH07224460A - Permanent concrete form and its manufacture - Google Patents

Abstract

PURPOSE:To provide an permanent form for use in concreting works, with which the rough surface provided for improving the attaching performance to the concrete has no risk of damaging the surface of other forms piled up so that a stable piled condition is generated and with which rough surface can be achieved easily. CONSTITUTION:A permanent concrete form 1 is structured so that detent steps for joining 2A, 2B are provided at the end face of a plate 1A consisting of fiber-reinforced cement and structured hollow or solid and that a plurality of ridges 3...3 are furnished on the surface 1C contacting the concrete placed, wherein only the form surface 1D between the ridges 3...3 are roughened. The rough surface is obtained by extrusion, grinding or a chemical treatment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent formwork for concrete and a method for producing the same.

[0002]

2. Description of the Related Art Generally, a concrete wall is constructed by forming a mold made of plywood or the like, pouring concrete into the mold, waiting for it to harden, and removing the mold from the concrete wall surface. In the case of, the construction was performed by the procedure of attaching the heat insulating material. However,
In the case of the above-mentioned formwork method, the formwork is used only for constructing the wall surface, and there is a drawback that the subsequent work for removing the formwork takes a lot of trouble.

From such a viewpoint, 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. 3-293473). ). This type of concrete formwork has the advantage that it can be integrated with the concrete to be poured and the formwork will be integrated with the walls or columns of the building structure as it is, so that the subsequent frame removal work can be omitted. .

[0004]

[Problems of the prior art] 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 adhesiveness with the concrete to be placed, and to further improve the adhesiveness. It is possible to make the surface rough and improve the physical adhesion.However, if the surface of the ridge is rough, the smoothness of the surface is impaired and the concrete permanent formwork is stacked and stored. If the roughened surface comes into contact with another concrete formwork surface and damages this surface, or the surface is rough, there is a problem that the smooth state is not uniform and the laminated state is not stable. there were. Also, in the case of forming these rough surfaces, it may be difficult to remove the rough surfaces in the case of cast molding.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a permanent formwork for concrete work in which a rough surface that improves adhesion to concrete damages the surface of another laminated concrete formwork. It is an object of the present invention to provide a permanent formwork for concrete which can be stably stacked and which can easily form a rough surface, and a method for producing the same.

[0006]

That is, the permanent formwork for concrete of the present invention has an engaging step (2A) for joining to an end face of a fiber-reinforced cement plate-like body (1A) which is hollow or solid. , (2B) are provided, and a plurality of projecting ridges (3) ... (3) are provided on a surface (1C) that comes into contact with the concrete to be cast. Forming surface (1) between ridges (3) ... (3)
D) only has a rough surface, and the mold surface (1) between the plurality of ridges (3) ... (3).
D) or at least one ridge (3) of the ridges (3) has a roughened surface, and another aspect of the present invention is the permanent mold for concrete described above. Regarding the manufacturing method, the fiber-reinforced cement kneading material (S) is extruded into a plate-like body (1A) which is a hollow or solid plate-like body having a plurality of projections (3) ... (3) on one surface. In this case, it extends to the surface side of the plate-shaped body (1A) at a position corresponding to the ridges (3) ... (3) on one surface of the molding die (4) for molding the plate-shaped body (1A). The plate members (5) ... (5) in contact with each other are attached at regular intervals along the width direction of the molding die (4) and extrusion molding is performed.

Still another invention relates to a method for manufacturing a permanent formwork for concrete as described above, wherein the joining step portions (2A) and (2B) for joining are joined to the end face by a fiber-reinforced cement kneading material and the concrete to be cast. Permanent formwork for concrete (1) having a plurality of ridges (3) ... (3) on the surface (1C)
After molding and curing and curing, the surface (1C) in contact with the concrete to be placed is roughly ground to form visible and atundum concave streaks, and the reinforcing fibers contained therein are exposed. In addition, the fiber-reinforced cement kneading material is used to make a plurality of joining step portions (2A) and (2B) for joining on the end surface and a surface (1C) which comes into contact with the concrete to be placed. Permanent formwork for concrete (1) having ridges (3) ... (3)
After molding and curing and curing, the surface (1C) in contact with the concrete to be poured is treated with acid to elute the cement component on the surface and then immediately washed with water to reinforce the reinforcing fibers contained in the cement layer on the surface. The feature is that it is exposed and fluffy.

[0008]

Embodiments of the present invention will be described below. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a plan view of the embodiment, and FIG.
FIG. 4 is an enlarged sectional view of a main part of a forming die for carrying out the method of the present invention, and FIG. 4 is a front view of the same.

Permanent formwork for concrete of the present invention (1)
Is the end face (1B) of the plate-shaped body (1A) made of fiber-reinforced cement, which is hollow or solid (solid body in the illustrated example), (1
B) is provided with joining engaging step portions (2A) and (2B),
In a permanent formwork for concrete (1) having a plurality of ridges (3) ... (3) provided on a surface (1C) in contact with concrete to be placed, a plurality of ridges (3) ... (3) Between (1) to (1D) are rough surfaces. Further, in the above-mentioned embodiment, when the precision of the comprehensive plane of the plurality of ribs (3) ... (3) is high, at least one surface of the ribs (3) ... (3) may be a rough surface.

Next, a method for producing the concrete permanent formwork (1) of the present invention will be described. A plate-like body (1A) containing a fiber-reinforced cement kneading material (S), which is a hollow or solid plate-like body having a plurality of projections (3) ... (3) on one surface.
In the case of extrusion molding into a plate-shaped body (1A), it is extended to the surface side of the plate-shaped body (1A) at a position corresponding to the ridges (3) ... (3) of the molding die (4) for molding the plate-shaped body (1A). Forming (1) between the ridges (3) ... (3) by attaching plate members (5) ... (5) in contact with each other at regular intervals along the width direction of the forming die (4) and performing extrusion molding. The surface is roughened.

In the above embodiment, the contact ends (5A) of the plate members (5) ... (5) in contact with the cement-kneaded material (S) are smaller than an angle of 90 ° as shown in the partially enlarged view of FIG. It is desirable to have a knife edge shape with an acute angle θ. 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.

As an example of the method for producing a permanent mold for concrete described above, the case where a rough surface is formed at the same time in extrusion molding is shown, but in the case of a product after curing and curing, the permanent mold for concrete (1) Roughly grind the surface (1C) in contact with the concrete to be placed by sandblasting, polishing brush, sandpaper, etc. to form visible and at random random streaks, and to expose the reinforcing fibers contained and make them fluffy. It

The above grinding process is carried out by a grinding means corresponding to a coarser grain than sandpaper # 48. The reason for this is
This is because the grinding surface corresponding to a finer mesh than # 48 smoothes the surface to be treated, and the fluffing of the fiber cannot be obtained. Desirably, a roughness of about # 24 is most preferable.
FIG. 5 is an enlarged cross-sectional view of the main parts of the permanent formwork (1) for concrete obtained by this method, showing atundum concave streaks (1E) formed by the rough grinding process and the kerfs exposed by the concave streaks The state of the standing reinforcing fiber (1F) is shown.

Although the case of using a mechanical means is shown as the above-mentioned embodiment, the invention is not limited to this, and a chemical means can also be used. That is, using the fiber-reinforced cement kneading material, the engaging step portions (2A) and (2B) for joining to the end surface, and the plurality of ridges (3) ... (3) on the surface (1C) in contact with the concrete to be placed.
After molding a permanent mold for concrete (1) having the above and curing and curing, a surface (1
C) is treated with an acid to elute the cement component on the surface, and then immediately washed with water to expose the reinforcing fibers contained in the cement layer on the surface to make them fluffy.

FIG. 6 shows an enlarged cross-sectional view of the essential parts of a permanent formwork (1) for concrete treated by this method.
Indicates an uneven surface formed by the acid treatment, and (1F) indicates an exposed fiber.

According to this method, the entire surface of the permanent mold for concrete (1) in contact with concrete can be uniformly treated. If the acid treatment is carried out for a long period of time or with a strong acid, the permanent formwork body for concrete may be attacked and the strength may be reduced. Erodes. By this acid treatment, the cement components are eluted, but the fibers are not eluted, so that the reinforcing fibers contained in the eroded layer are exposed and become fluffy.

[0017]

The permanent mold (1) for concrete according to claim 1 is
Since the surfaces of the ridges (3) ... (3) are smooth and the surface between the ridges is a rough surface, when the concrete permanent formwork (1) is stacked, the smooth surface has the other concrete permanent formwork (1). It does not damage these as it comes into contact with.

Permanent formwork (1) for concrete according to claim 2
In the case where the ridge (3) has a sufficiently high plane flatness accuracy, a stable stacking state is achieved when the ridge surface is rough even when the ridge surface is rough. Further, the permanent formwork (1) for concrete according to claims 1 and 2 has good adhesiveness to the rough surface of the cast concrete, and is strong against the concrete cast together with the ridges. Exhibits adhesion.

In the method of manufacturing a permanent mold for concrete according to the third aspect of the present invention, when extrusion molding is performed, a rough surface can be easily formed simply by attaching a plate member to the molding die.

According to the present invention, since the permanent mold for concrete after hardening is processed, it can be applied to any permanent mold for concrete obtained by any molding means. Therefore, the desired grinding process can be performed in a short time. Since claim 5 is carried out by a chemical treatment, no power is required. Further, the dilute hydrochloric acid after treatment is considerably neutralized with cement, which reduces the burden of waste liquid treatment.

[0021]

As described above, according to the permanent formwork (1) for concrete of claims 1 and 2, it does not become unstable even when stacked and stored before use, and the surface is damaged by mutual contact. The manufacturing of the permanent formwork for concrete according to claim 3, wherein the building has a higher strength, and has little or no damage, and has very little adhesion to the cast concrete. According to the method, since it is sufficient to simply attach the plate member to the forming die, it is easy to carry out, inexpensive, and it is possible to manufacture a large amount of molds having excellent performance.

Further, according to the invention of claim 4, the present invention is not limited to extrusion molding, but can be applied to a permanent mold for concrete obtained by another manufacturing method, and since it is a rough treatment, the processing time is also long. Has the effect of being able to quickly. According to the fifth aspect of the invention, since the fluffing of the fibers contained is performed by a chemical treatment, it is possible to quickly obtain the fluffing of the fibers without requiring power and without generating noise. Further, since the waste liquid of dilute hydrochloric acid after the treatment is considerably neutralized by the cement component, there is an effect that the burden of treating the waste liquid is small.

[Brief description of drawings]

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

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a sectional view of a forming die for carrying out the method of the present invention.

FIG. 4 is a front view of a molding die for carrying out the method of the present invention.

FIG. 5 is an enlarged sectional view of an essential part of the surface of a permanent mold for concrete obtained by another invention.

FIG. 6 is an enlarged sectional view of an essential part of the surface of a permanent formwork for concrete obtained according to still another invention.

[Explanation of symbols]

 (1) ... Permanent formwork for concrete (1A) ... Fiber reinforced cement plate (1B) ... End face (1C) ... Surface in contact with concrete to be placed (1D) ... Formwork surface between ridges (1E) ): Visually visible concave streaks (1F): fluffed fibers (2A): joining engagement step (2B) ... joining engagement step (3) ... ridge (4) ... molding die ( 5) ... Plate member (S) ... Fiber reinforced cement kneading material

Claims (5)

[Claims] 1. An engaging step (2) for joining to an end surface of a plate-shaped body (1A) made of a fiber-reinforced cement which is hollow or solid.
A), (2B) are provided, and a plurality of projecting ridges (3) ... (3) are provided on a surface (1C) that comes into contact with the concrete to be placed. A permanent formwork for concrete, characterized in that only the formwork surface (1D) between a plurality of ridges (3) ... (3) is roughened. 2. An engaging step (2) for joining to an end face of a fiber-reinforced cement plate-like body (1A) which is hollow or solid.
A), (2B) are provided, and a plurality of projecting ridges (3) ... (3) are provided on a surface (1C) that comes into contact with the concrete to be placed. Form surface (1D) between a plurality of ridges (3) ... (3) or at least one ridge (3) of the ridges (3) is characterized by being rough Permanent formwork for concrete. 3. The fiber-reinforced cement kneading material (S) is extruded into a hollow or solid plate-like body having a plurality of projections (3) ... (3) on one surface. In the case of doing, it extends to the surface side of the plate-shaped body (1A) at a position corresponding to the ridges (3) ... (3) on one surface of the molding die (4) for molding the plate-shaped body (1A). A method for manufacturing a permanent formwork for concrete, characterized in that plate members (5) ... (5) that come into contact with each other are attached at regular intervals along the width direction of the forming die (4) and extrusion molding is performed. 4. The fiber-reinforced cement kneading material is used for joining engagement step portions (2A), (2B) on an end surface, and a plurality of ridges (3) on a surface (1C) in contact with concrete to be placed.
After molding the permanent formwork (1) for concrete having (3), curing and curing, the surface (1C) in contact with the concrete to be placed is roughly ground, and at least visible concave random streaks A method for producing a permanent formwork for concrete, which comprises forming (1E) and exposing the reinforcing fibers (1F) contained therein to make them fluffy. 5. The fiber-reinforced cement kneading material is used to form a plurality of ridges (3) on the end faces (2A), (2B) for joining, and on the face (1C) in contact with the concrete to be placed.
After molding the permanent formwork (1) for concrete having (3) and curing and hardening, the surface (1C) in contact with the concrete to be placed is acid-treated to elute the cement component on the surface, and then immediately washed with water. Thereby, the reinforcing fiber (1F) contained in the cement layer on the surface is exposed to make it stand up, and a method for producing a permanent formwork for concrete.