JP2547455B2 - Method of manufacturing concrete panel - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a concrete panel having a so-called tilt function, in which the density, concentration, content, etc. of concrete change in the thickness direction, the longitudinal direction, etc. It can be used for manufacturing lightweight cellular concrete panels and the like.

[Background Art] Conventionally, using cement and silica sand as the main raw materials, a concrete slurry mixed with air bubbles is placed in a molding frame in which a reinforcing material is placed, and after temporarily hardening, a high temperature, A lightweight cellular concrete panel manufactured by steam curing in a high-pressure autoclave has been put into practical use.

Although a normal lightweight cellular concrete panel has a uniform density in the thickness direction, a concrete panel (integral panel) having a so-called tilt function in which the density is changed in the thickness direction is also manufactured. That is, according to such a panel, the high density concrete layer on the panel outer wall side is
Since it is dense and hard, it has waterproofness and strength against impact, and also has good coating performance because of its smooth surface. On the other hand, the low-density concrete layer on the panel inner wall side has many air bubbles, is light and soft, and is therefore excellent in soundproofing and heat retention, and also has the function of absorbing and discharging water in the room.

A conventional concrete panel having a tilt function increases the density of the lower layer by crushing the bubbles in the slurry by forcibly sucking it from the bottom when pouring the concrete slurry into the mold, or crushing the surface with a roller. It was manufactured by increasing the density of the upper layer.

[Problems to be Solved by the Invention] According to the above-described conventional method for producing a concrete panel having a gradient function, the concrete layer having a varying density is limited to a part of the upper layer or the lower layer by any method. However, it is not possible to manufacture a concrete panel whose density continuously changes in the thickness direction, and a concrete panel having a good gradient function cannot be obtained. In addition, since such a panel has a discontinuous density gradient, when an impact is applied, stress concentrates on the discontinuous interface and is easily cracked.

An object of the present invention is to provide a method for producing a concrete panel having a gradient function, which can continuously change the density of concrete in the thickness direction, the longitudinal direction, and the like.

[Means for Solving the Problems] In the method for manufacturing a concrete panel having a gradient function, the present invention supplies a plurality of concrete slurries of different types to a mixer while controlling the supply amount of each concrete slurry. After stirring and mixing in the inside, the mixed concrete slurry is poured into a molding frame.

With different types of concrete slurries, the density,
Concrete slurries with different concentrations and materials.

[Operation] For example, two types of concrete slurries, that is, a high density concrete slurry and a low density concrete slurry are prepared. When supplying both to the mixer at the same time,
When the ratio of concrete slurry with high density is increased at first and the ratio of concrete slurry with low density is gradually increased, the density of the mixed slurry supplied to the form from this mixer continuously changes from large to small. To do. When this mixed slurry is sequentially cast in the thickness direction, a concrete panel having a density gradient formed in the thickness direction is obtained, and when it is sequentially cast in the longitudinal direction, a concrete panel having a density gradient formed in the longitudinal direction is obtained. can get.

[Example] An example of applying the present invention to a method for manufacturing a lightweight cellular concrete panel having a tilt function will be described with reference to the drawings.

First, the configuration of the manufacturing apparatus used for this embodiment will be described.

As shown in FIG. 1, this manufacturing apparatus includes first and second raw material blending machines 10A and 10B and a spiral mixer 20 having the same structure.

The first and second raw material blending machines 10A, 10B are, for example, 3
It has individual feeders 11A, 11B, first compounding parts 13A, 13B provided with stirring plates 12A, 12B, and second compounding parts 15A, 15B provided with stirrers 14A, 14B. Stirrer plate 12A, 1 below the section
Motors 16A and 16B for rotating the 2B and the agitators 14A and 14B are installed. In addition, a supply pipe (not shown) for the water 1 is disposed in the communication pipes 17A, 17B between the first mixing portion 13A, 13B and the second mixing portion 15A, 15B, and the second mixing portion 15A, 15B has 2 bubbles
A supply pipe (not shown) is provided.

The spiral mixer 20 is provided with a spiral stirring blade 21 inside and the motor of the stirring blade 21 is outside thereof.
22 are installed.

Further, valves 23A and 23B are provided between the first and second raw material mixing machines 10A and 10B and the spiral mixer 20, respectively, and opening / closing of these valves 23A and 23B is controlled by a control means (not shown). It

Using the above manufacturing apparatus, a lightweight cellular concrete panel having a density gradient formed in the thickness direction is manufactured as follows.

First, the powder material such as cement and silica sand is supplied from the feeder 11A of the first raw material blending machine 10A to the first blending section 13A,
Stir and supply to the second blending section 15A while adding water 1.
Here, a small amount of foam 2 is added and stirred to prepare a lightweight cellular concrete slurry 3A having a large density ρ (for example, 1.5).

On the other hand, also in the feeder 11B of the second raw material blending machine 10B, the same powder raw material is fed to the first blending section 13B, stirred and fed to the second blending section 15B while adding water 1, and then a large amount. By adding and stirring the bubbles 2 of No. 3, a lightweight cellular concrete slurry 3B having a small density ρ (for example, 0.3) is prepared.

Next, the slurry 3A having a high density and the slurry 3B having a low density are simultaneously supplied to the spiral mixer 20 from the first and second raw material blending machines 10A and 10B, and the slurry is mixed in the mixer 20 by stirring and mixing. Make 3C. The prepared mixed slurry 3C is continuously cast into a molding form 25 in which a reinforcing material (not shown) is arranged.

In the supply of these slurries 3A, 3B to the spiral mixer 20, by adjusting the opening / closing amount of the valves 23A, 23B by the control means, the proportion of the slurries 3A having a large density at the beginning is relatively increased, and the density of the slurries is gradually increased. Increase the ratio of the small slurry 3B. Therefore, this spiral mixer
The density of the mixed slurry 3C supplied from 20 to the mold 25 and deposited in the longitudinal direction continuously changes from large to small in the thickness direction.

Next, after the mixed slurry 3C that has been cast is temporarily cured, autoclave curing is performed, so that the density becomes continuous from one surface 4A side to the other surface 4B side, as shown in FIG. Lightweight aerated concrete panel 4
Get.

According to this embodiment, the first and second raw material blending machines 10A, 10
The relative ratio of the slurry 3A having a high density and the slurry 3B having a low density, which is supplied to the spiral mixer 20 from B, is continuously changed, so that the spiral mixer 20 supplies the slurry to the mold 25. The density of the mixed slurry 3C also continuously changes, and it becomes possible to manufacture the lightweight cellular concrete panel 4 formed so that the density gradient continuously decreases from the one surface 4A side to the other surface 4B side. . Therefore, since the panel 4 manufactured in this example has a good tilting function, as compared with the panel manufactured by the conventional method, the waterproofness, the impact strength and the coating performance of the one surface 4A side and the other The surface 4B side has more excellent moisture absorption and discharge performance. Further, since the density gradient is formed continuously and there is no interface, there is no fear of breaking from the interface even when a shock is applied, unlike the conventional panel.

Although the panel 4 having the density gradient provided in the thickness direction is manufactured in the above-described embodiment, the panel 4 having the density gradient provided in the longitudinal direction can be manufactured as another embodiment.

That is, as shown in FIG. 3, after the mixed slurry 3C having a high density is initially cast on one end 25A side of the form 25, the density is increased while sequentially moving the casting position toward the other end 25B. As shown in FIG. 4, the density is continuously reduced from the one end 5A side to the other end 5B side by pouring the mixed slurry 3C adjusted so that An aerated concrete panel 5 is obtained. When the mixed slurry 3C is cast, it is necessary to continue the casting while setting an appropriate curing time each time a proper amount of the slurry 3C is cast so that the slurry 3C is deposited in the thickness direction. Such a panel 5 having a density gradient formed in the longitudinal direction is effective, for example, when one end portion 5A having a high density is provided on the base side and particularly the lower portion thereof has waterproofness and impact resistance. .

In addition, although the concrete panel is a lightweight cellular concrete panel in the above embodiment, the present invention can be similarly applied to the case of manufacturing other types of concrete panels.

For example, the concrete panel may be a lightweight aggregate-containing lightweight concrete panel, a fiber reinforced concrete panel, or the like. In this case, in order to provide a density gradient, instead of the foam 2 in the above-mentioned embodiment, the slurries 3A, 3B are used. It suffices to adjust the mixing ratio of the aggregates and fibers contained in.

Further, although the above-mentioned embodiment is an example of a concrete panel having a gradient function with respect to density, the present invention can be similarly applied to a concrete panel having a gradient function with respect to other concentrations, materials and the like.

For example, when manufacturing a panel that has different grades of materials such as lightweight cellular concrete and fiber reinforced concrete and has a gradient function, one lightweight cellular concrete slurry is cast and then the other fiber reinforced concrete slurry is mixed. However, according to the present invention, a panel in which the ratio of lightweight cellular concrete and fiber reinforced concrete is continuously changed in the thickness direction, the longitudinal direction, etc. It will be possible.

[Effect of the Invention] According to the present invention, the density of concrete, etc. in the thickness direction,
Since it can be continuously changed in the longitudinal direction and the like, a concrete panel having a good tilting function can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of a manufacturing apparatus used in an embodiment of the present invention, FIG. 2 is a sectional view of a lightweight cellular concrete panel manufactured in this embodiment, and FIG. 3 shows a manufacturing method of another embodiment. Sectional drawing, FIG. 4 is a sectional view of a lightweight cellular concrete panel manufactured in another embodiment. 3A, 3B ... Lightweight cellular concrete slurry, 3C ... Mixed slurry, 4,5 ... Lightweight cellular concrete panel, 10A, 10B ... Raw material mixing machine, 12A, 12B ... Stirrer plate, 13A, 13B ... 1st mixing section, 14
A, 14B ... Stirrer, 15A, 13B ... 2nd compounding part, 20 ... Spiral mixer, 21 ... Stirring blade, 25 ... Forming mold.

Claims (1)

(57) [Claims] 1. A method for manufacturing a concrete panel having a gradient function, wherein a plurality of different types of concrete slurries are supplied to a mixer while controlling the supply amount of each concrete slurry, and the mixture is stirred and mixed in the mixer, A method for producing a concrete panel, which comprises placing the mixed concrete slurry in a molding frame.