JP2709018B2 - Manufacturing method of glazed concrete products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a glazed concrete product used as a building material.

[0002]

2. Description of the Related Art Conventionally, cylindrical glazed concrete products having a cross-sectional shape such as a circle or a mouth used for building accessories, pillars, civil engineering members, or exterior members are manufactured by applying a glaze to a centrifugally formed concrete base material. It was manufactured by coating and firing. Centrifugal force molding is a method of compacting concrete using centrifugal force.A circular tire is attached to the outside of the formwork, and this is put on a centrifuge stand and the formwork is rotated at high speed. The resulting centrifugal force presses the concrete material against the inner peripheral surface of the formwork.

The procedure for manufacturing this glazed concrete product will be described. First, concrete and a PC steel wire or a PC steel rod are put in a formwork, and these are 3 to 30G.
Centrifugal force molding is performed at a rotational force of about 2 to 10 minutes to form a concrete substrate that is prestressed concrete.
The concrete substrate is left to stand naturally for 8 to 24 hours and is naturally cultivated or left to stand in an atmosphere at 60 degrees Celsius for 2 to 10 hours to dry and cultivate. In the case of training, it is preferable to cover the concrete substrate with vinyl or the like to prevent evaporation of water. Next, the concrete base material is released, and the temperature is 200 to 3 degrees Celsius.
After drying in an atmosphere of 00 degrees for 2 to 24 hours to reduce the water content to 5% or less, spraying or flowing glaze, and firing at 800 to 900 degrees Celsius for 6 to 24 hours, then 30 minutes to 3 hours Soak in water for hours to absorb water. Finally,
6 hours in a 60 ° C atmosphere
Leave to rehydrate for 3 days.

[0004]

However, cracks have occurred in the concrete base material during firing because the concrete base material is affected by the expansion strain of the PC steel wire or PC steel rod. Moreover, since the concrete base material embeds a PC steel wire or a PC steel rod extending in one direction, the strength was insufficient in a direction parallel to the longitudinal direction of the PC steel wire or the PC steel rod.

An object of the present invention is to provide a method for producing a glazed concrete product which does not cause cracks.

[0006]

According to the method for producing a glazed concrete product of the present invention, a wire mesh which is wound in a cylindrical shape is embedded in a concrete base material so that both ends are movably hung in the circumferential direction.

[0007]

According to the method for manufacturing a glazed concrete product of the present invention, since a wire mesh which is cylindrically wound by embedding the vicinity of both ends movably in the circumferential direction on the concrete base material is buried, it is fired. In this case, the concrete base material is hardly affected by the expansion strain of the wire mesh. In addition, even if an external force is applied in any of the circumferential direction and the radial direction of the concrete base material, the concrete base material can be reinforced by the wire mesh.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for producing a glazed concrete product according to one embodiment of the present invention will be described. First, as shown in FIG. 1, a wire mesh 1 made of a lath base material wound in a cylindrical shape is prepared. The wire mesh 1 is loosely bound by wires 2 near both ends so that both ends can move within a range of 30 to 50 mm from each other.
The wire mesh 1 is put into the mold along the inner peripheral surface, and the concrete material is uniformly poured into the mold. By rotating the mold and performing centrifugal force forming, a concrete base material in which the wire mesh 1 is embedded is formed. Next, the concrete base is naturally or dry-cured and then released, and the surface of the concrete base is sprayed or poured with glaze, and the concrete base is fired.

As described above, since the wire mesh 1 which is loosely bound by the wires 2 at both ends and wrapped in a cylindrical shape is embedded in the concrete base material, the expansion of the wire mesh during firing is limited by the concrete base material. It is hard to be affected by. Also, even if external force is applied in any of the circumferential direction and the radial direction of the concrete base material,
The wire mesh 1 can reinforce the concrete substrate. Therefore, generation of cracks in the concrete base material can be prevented. Other configurations are the same as in the conventional example.

[0010] The wire net 1 includes expanded metal or punched metal. Further, the sectional shape of the concrete base material may be an ellipse or a polygon.

[0011]

According to the method for manufacturing a glazed concrete product of the present invention, a cylindrically wound wire mesh is buried in a concrete substrate by movably suspending both ends in the vicinity of each other in the circumferential direction. During firing, the concrete base material is not easily affected by the expansion strain of the wire mesh. In addition, even if an external force is applied in any of the circumferential direction and the radial direction of the concrete base material, the concrete base material can be reinforced by the wire mesh. Therefore, generation of cracks in the concrete base material can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a wire mesh.

[Explanation of symbols]

 1 wire mesh 2 wire

Claims (1)

(57) [Claims] 1. A concrete base is formed by rotating a mold, pressing a concrete material against the inner peripheral surface of the mold by centrifugal force and compacting the concrete material, and forming a glaze on the surface of the concrete base. A method for manufacturing a glazed concrete product which is applied and fired, characterized in that a glazed concrete product is buried in the concrete base material by wrapping around the both ends in a circumferential direction so as to be movable in a circumferential direction with respect to each other. Manufacturing method.