JP2912025B2 - Method of manufacturing concrete board - 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 manufacturing a concrete plate, and more particularly, to a method for manufacturing a concrete plate having a tilting function by applying a centrifugal force forming method.

[0002]

BACKGROUND OF THE INVENTION The present applicant has previously filed Japanese Patent Application No. 63-2635.
No. 3 disclosed a concrete manufacturing method. This is characterized in that moisture is contained in a porous aggregate having open voids, mixed with sand and cement, and poured into a mold as a powder (hereinafter referred to as this construction). Concrete cast by the method is called FASC concrete.)

[0003] This FASC concrete focuses on the fact that a porous artificial lightweight aggregate has a high water absorption rate, and the aggregate temporarily absorbs water without mixing water for hydration of cement. A large amount of free water is used for the hydration of cement.

[0004]

SUMMARY OF THE INVENTION However, the FAS
C concrete requires pressure molding, and in order to industrialize it, it was necessary to remove the mold immediately after casting the concrete and increase the number of uses of the formwork.

Accordingly, an object of the present invention is to provide a method for manufacturing a concrete plate capable of efficiently manufacturing FASC concrete.

[0006]

As a means for achieving this object, a method for manufacturing a concrete plate according to the present invention is characterized in that a porous aggregate having open porosity is impregnated with water and mixed with sand and cement. The object is formed by a centrifugal force forming method.

Here, the centrifugal force forming method is a method in which a concrete material is put into a cylindrical form or the like, and the ready-mixed concrete is pressed against the form by centrifugal force generated when the form is rotated. This is a method of finishing concrete products with a thickness. According to this molding method, an inner mold is not required, and it is possible to manufacture a dense and high-strength concrete product.

[0008]

According to the present invention, since the FASC concrete is formed by centrifugal force molding, the material is uniformly pressed and compacted by the centrifugal force, so that the powder can be efficiently poured into the formwork as it is.

Further, since the magnitude of the centrifugal force differs depending on the specific gravity of concrete materials such as aggregate and cement, those having a large specific gravity gather outside the formwork and those having a small specific gravity gather inside, and the physical properties are inclined in the thickness direction. A concrete plate which changes gradually is manufactured.

[0010] In general, in order to impart another function to a concrete plate, a material having a function corresponding to, for example, a molded heat insulating plate or the like had to be adhered to the concrete plate. It became a continuous surface, and phenomena such as internal condensation and peeling occurred at this portion. However, according to the present invention, by mixing a functional material such as a lightweight aggregate into concrete, it is possible to manufacture a product in which the physical properties continuously and gradually change in the thickness direction without a discontinuous surface. Was.

Further, the moisture contained in the porous aggregate having open voids is discharged into the cement by centrifugal force, and the hydration reaction of the cement is performed more efficiently.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments.

In this embodiment, cement used was ordinary Portland cement, fine aggregate was sand, and coarse aggregate was artificial light-weight aggregate having open pores.

In the preparation, it is necessary to cause all the hydration reaction of the cement by the self-curing water from the coarse aggregate.
90%, and the water cement ratio was adjusted to 15 to 35%.

As a procedure, first, the artificial lightweight aggregate is sufficiently absorbed by water.

Next, the mixture is mixed with the fine aggregate and cement and stirred and then charged into a predetermined centrifugal molding machine.

FIG. 1 shows a mold frame 1 for a centrifugal force forming apparatus used in this embodiment.

In this embodiment, a plurality of FASC concrete panels 3 are formed at the time of removing the frame by providing the partition plate 2 in the mold 1 for the centrifugal force forming machine. Here, as shown in the enlarged view of FIG. 2, in order to make the finished product a flat surface after molding so that it can be used for a wall or the like, a half-moon-shaped form material is further provided inside the circular form. 4 were provided. In this embodiment, a conventional cylindrical mold for centrifugal force forming is divided into eight parts.

Further, by arranging the reinforcing steel bars 5 in advance, it is possible to manufacture a concrete plate having higher strength.

Next, the mixed and stirred FASC concrete material is introduced into the rotating mold 1 for a centrifugal molding machine, and the material is introduced using a belt or a screw conveyor. After molding, the inside of the concrete is smoothed with a brush or the like.

The number of revolutions of the centrifugal molding machine is desirably in a range where the material is appropriately compacted and the material is not separated with a decrease in strength, and when the diameter is about 3 m, it is about 300 to 1500 rpm. Is appropriate.

Within this range, as shown in FIG. 3, it has a thickness t, and one surface of the concrete plate is watertight, durable,
The solid portion 6 having excellent sound insulation and waterproofness, and the other surface are formed as a porous portion 7 having excellent moisture absorption / release, sound absorption, flexibility, and heat insulation. That is, due to the centrifugal force, the solid portion 6 is located outside the mold 1 of the centrifugal force forming machine,
Is formed inside. Moreover, in this case, the solid portion 6 does not continuously change from the porous portion 7 to a discontinuous surface. Therefore, problems such as dew condensation and peeling, which have been problems in the past, do not occur.

In this embodiment, the centrifugal force forming is performed in a range of 10 to 3
It was performed for about 0 minutes, and after curing for 2 to 3 days, it was possible to remove the mold.

Further, in this embodiment, by providing the partition plate 2 in the mold 1 of the centrifugal force forming machine, a plurality of FAS
Although the C concrete panel 3 can be obtained, as shown in FIG. 4, it is also possible to manufacture the panel 3 by cutting the integrally formed cylindrical concrete cylinder vertically.

In this case, as shown in FIGS. 5 and 6, if a finishing material (metal plate, tile, stone material, etc.) 8 is laid beforehand in the form material 4, the concrete poured and the centrifugal force are applied. A FASC concrete panel having the finishing material 8 is formed by being integrated by the crimping effect.

By these methods, a product using FASC concrete, which is lightweight and has moisture absorbing and releasing performance, can be obtained.

Here, the concrete plate 3 as a product is
It has a width W obtained by equally dividing a circle, and the length L can be appropriately determined.

Further, as shown in FIG. 7 (a) or (b), another small formwork 9 previously filled with ready-mixed concrete is attached to the formwork 1 of the forming machine to form a concrete plate or block. can do. Even in the case of using this method, by laying the finishing material 8, it is possible to produce a FASC concrete product having the finishing material 8 described above.

As a method of industrially manufacturing a concrete plate, there are a vibration method, a pressurization method, and the like. In the present embodiment, the difference in centrifugal force inherent in the centrifugal force forming method is used. A concrete plate having a tilting function is manufactured by appropriately separating materials within a range where the strength is not reduced and combining the FASC concrete manufacturing method.

[0030]

According to the present invention, since FASC concrete is cast using a centrifugal molding machine, FASC concrete can be manufactured efficiently.

Further, it is possible to efficiently and stably mass-produce concrete plates whose density changes in a gradient manner in the thickness direction.

Therefore, according to the present invention, it is possible to obtain a wall plate having, for example, a waterproof function, a heat insulating function, and a sound insulating function required for an outer wall of a building, and a moisture absorbing / releasing function and a sound absorbing function on the indoor side. In the case of a floor panel, strength and sound insulation and sound absorption performance are required, but this method can be used. This is particularly effective when the functions required on both sides of the wall are different.

Further, by laying the finishing material in the formwork material in advance, a FASC concrete having the finishing material can be obtained. Furthermore, a concrete plate or block can be obtained by attaching another small formwork within the formwork of the molding machine.

[Brief description of the drawings]

FIG. 1 is a front view of a mold for a centrifugal force forming apparatus used in a first embodiment.

FIG. 2 is an enlarged view of a mold for a centrifugal force forming device used in the first embodiment.

FIG. 3 is a sectional view of a concrete plate manufactured according to the present embodiment.

FIG. 4 is a perspective view showing a mold for a centrifugal force forming device used in another embodiment.

FIG. 5 is an enlarged view of a mold for a centrifugal force forming device used in a second embodiment.

FIG. 6 is a sectional view of a concrete plate manufactured according to the present embodiment.

FIG. 7 is a front view showing an example in which another small formwork is installed in a formwork for a centrifugal force forming apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Formwork for centrifugal forming machine 2 Partition plate 3 FASC concrete panel 4 Formwork material 5 Reinforcing bar 6 Solid part 7 Porous part 8 Finishing material (metal plate, tile, stone material, etc.) 9 Small formwork

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-19806 (JP, A) JP-A-2-9603 (JP, A) JP-A-64-71707 (JP, A) JP-A-62-1987 132607 (JP, A) (58) Fields surveyed (Int. Cl. ⁶ , DB name) B28B 1/20

Claims (3)

(57) [Claims] 1. A method for producing a concrete plate, comprising: adding water to a porous aggregate having open pores; mixing the mixture with sand and cement; and forming the mixture by centrifugal force forming. 2. The method for producing a concrete plate according to claim 1, wherein a finishing material is laid beforehand in the forming mold. 3. The molding is carried out by attaching another small formwork in which a material is previously put into the mold formwork.
Or the method for producing a concrete plate according to 2.