JPH0948651A - Method and apparatus for manufacturing artificial stone - Google Patents

Abstract

(57) [Abstract] [Problem] High strength by using a large amount of waste asphalt mixture generated due to repair work on roads, etc. and thermoplastics that are discarded in large quantities as household waste and industrial waste. Another object of the present invention is to provide a method for manufacturing an artificial stone material such as the artificial cobblestone, the artificial chestnut stone, or the artificial split stone, and an apparatus for manufacturing the same. SOLUTION: A waste asphalt mixture 10 and a thermoplastic 12 mainly containing asphalt pitch and crushed stone.
Is heated while stirring to melt the asphalt pitch, and the thermoplastic 12 is melted by heating, and the melted asphalt pitch and the thermoplastic are substantially uniformly stirred and kneaded. Object 38 is divided into small pieces (48) and separated into small pieces (48)
The artificial boulder 66, which is an artificial stone material, was manufactured by cooling while preventing the recombination of the above. Further, the heating, melting, stirring and kneading device 13
And a rod-shaped forming device 32 that forms the obtained kneaded material 38 into a rod shape, a cutting device 34 that cuts the rod-shaped kneaded material 38 into an appropriate size, and a rolled kneaded material 48 that is rolled and molded while cooling. And a molding cooling device 36 for making the structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing an artificial stone material, and more particularly, to a molded article such as an artificial stone material having high strength, that is, an aggregate, by utilizing waste asphalt mixture and waste thermoplastic. The present invention relates to a method for manufacturing an artificial split stone, an artificial chestnut stone, etc. and a manufacturing apparatus therefor.

[0002]

2. Description of the Related Art Today, plastics have permeated all fields of daily life and are one of the essential materials for supporting high technology. However, as the production amount of plastics increases, various methods for treating the wastes have been studied. In order to solve this problem, the development of material recycling and thermal recycling, and various measures such as simple incineration and land reclamation are considered as waste plastic waste countermeasures, of which simple incineration and land reclamation have already been implemented. There is. However, if the waste plastic is simply incinerated as one of the garbage, the combustion temperature becomes high and the furnace wall of the incinerator may be damaged, and consideration has been given to co-firing with other garbage. Also,
When waste plastic is landfilled as garbage, plastic is unlikely to be decomposed unlike so-called garbage, and it is said that there is a shortage of landfill, and recycling of it is desired.

On the other hand, most of the roads in Japan are paved with asphalt mixture, and such asphalt roads have been subjected to repair work when the road surface condition deteriorates, or water and sewerage systems buried under the roads, Roads are dug up due to construction work such as gas. A large amount of waste asphalt mixture has been generated with these works, and some of this waste asphalt mixture is reused, but most of it is disposed of by landfill. However, the use of landfill to dispose of waste asphalt mix was far from the point of view of resource recycling. Moreover, there is a shortage of landfills, and the recycling of waste asphalt mix is also required. In recent years, in particular, due to an increase in global environmental problems, problems such as proper disposal of waste, effective use of energy, and recycling have been strongly emphasized.

By the way, a large amount of natural crushed stones and natural stones such as split stones are used for foundation works such as civil engineering and construction work.
In addition, since a large amount of natural stones such as cobblestones and crushed stones are used for edging flower beds in roads and parks, a large amount of rocks have been quarried from mountains and rivers. However, not only is there a limit to the amount of rock that can be quarried, it is not possible to quarry above a certain limit from the viewpoint of flood control and mountain control. Therefore, there has been a demand for a method of obtaining a large amount of artificial stones having sufficient strength at low cost, instead of natural stones.

From this point of view, a method for manufacturing a stone material for civil engineering works by using waste asphalt mixture is disclosed in Japanese Patent Laid-Open No.
It is proposed in Japanese Patent No. 107447. The method of manufacturing this stone material for civil engineering works is to put the waste asphalt mixture into a heated waste oil tank to melt it, and then put the molten asphalt mixture into a heated kneader for heating and waste plastic, crushed stone, Additives such as glass, heavy waste material, calcium hydroxide, etc. are heated and kneaded, and the obtained heated and kneaded material is applied with a predetermined pressure to form a stone material having a predetermined shape.

[0006]

However, since the method for manufacturing a stone material for civil engineering work proposed in Japanese Patent Laid-Open No. 6-107447 uses waste oil and additives, there is a problem of impurities mixed in the waste oil. There is also a problem that the strength of the stone material that is molded by waste oil or the like tends to decrease. In addition, there is a problem that moldability is poor in the production of cobblestone, cobblestone, and the like, and since waste oil is used, the use is limited. Therefore, the inventors of the present invention addressed the demands for the improvement, simplification of the manufacturing process and the manufacturing apparatus, and reduction of the equipment cost.

[0007]

The gist of the method for producing an artificial stone material according to the present invention is to heat a waste asphalt mixture mainly composed of asphalt pitch and crushed stone and a thermoplastic resin while stirring, The asphalt pitch is melted, the thermoplastic is melted, and the molten asphalt pitch and the molten thermoplastic are stirred and kneaded almost uniformly, and then the obtained kneaded product is separated into small pieces of an appropriate size. , To cool while preventing recombination of the blobs.

Another aspect of the method for producing an artificial stone material according to the present invention is that the asphalt pitch, the waste asphalt mixture containing crushed stone as a main component, and the thermoplastic resin are heated with stirring to obtain the asphalt. Along with melting the pitch, melting the thermoplastic
After the molten asphalt pitch and the molten thermoplastic are kneaded and mixed substantially uniformly, the obtained kneaded product is formed into a rod shape and cut into an appropriate size, and the cut kneaded product is rolled and cooled while being molded. Is to let.

In such a method for producing an artificial stone material, thermoplastic resin is added in a ratio of 10 to 20% by weight to 90 to 80% by weight of the waste asphalt mixture.

Further, in the method for producing an artificial stone material, the cut and kneaded material is rolled and molded, while being gradually cooled with water or air, and then, if necessary, forcedly cooled with water or air.

Next, the gist of the artificial stone material manufacturing apparatus according to the present invention is that asphalt pitch, waste asphalt mixture containing crushed stone as a main component, and thermoplastics are heated with stirring to obtain the asphalt pitch. And a thermoplastic melt, and a heating and melting stirring and kneading device that stirs and kneads the molten asphalt pitch and the molten thermoplastic plastic substantially uniformly, and a rod-shaped forming device that forms the obtained kneaded product into a rod shape. And a cutting device that cuts the rod-shaped kneaded product to an appropriate length, and a molding cooling device that cools the cut kneaded product while rolling and molding.

A method and an apparatus for producing an artificial stone material according to the present invention comprises adding a predetermined amount of waste asphalt mixture mainly composed of asphalt pitch and crushed stone to a container such as a mixer of a heating, melting, stirring and kneading apparatus and stirring the mixture. However, at least the melting temperature of the asphalt pitch and the ignition temperature or less are heated to melt the asphalt pitch, and crushed stones are present in the melted asphalt pitch. Then, a predetermined amount of thermoplastic is added to the asphalt mixture, and the mixture is kneaded with the above-mentioned molten asphalt mixture while being heated to at least the melting temperature of the thermoplastic to be melted. here,
It is also possible to add a predetermined amount of waste asphalt mixture and thermoplastic to the container at the same time, heat and melt both, and stir and knead at the same time. Alternatively, separately melted thermoplastic resin may be added to the melted asphalt mixture and stirred and kneaded.

After the molten asphalt pitch and the thermoplastic are substantially uniformly stirred, the kneaded product obtained is separated into small pieces of appropriate size.
An apparatus for separating the kneaded material into small pieces comprises, for example, a rod-shaped forming device and a cutting device. First, the kneaded material is put into the rod-shaped forming device to form a rod-like shape. The rod-shaped forming device is, for example, a container having a kneaded product and a container having an opening through which the kneaded product is extruded, a screw arranged in the container, and a device having a drive device for rotating the screw,
Alternatively, the kneaded product is composed of a cylinder, a piston, and an extrusion device including an opening formed in the cylinder, and the kneaded product is extruded from the opening to form a rod shape. The kneaded material formed into a rod shape is cut into an appropriate size by a cutting device, and then supplied to a molding cooling device. The cut kneaded product supplied to the molding cooling device is crushed at the corners by rolling and gradually rounded, and among the bubbles existing inside the kneaded product, the bubbles near the surface are exposed to the outside. Get out. Thus, for example, the kneaded product is molded into a substantially spherical shape, is naturally cooled and solidified, and is cooled to a state in which the shape can be retained without rolling, and a high density artificial stone material without bubbles on the surface. Is manufactured.

In such a method for producing an artificial stone material, by adding a thermoplastic resin in an amount of 10 to 20% by weight to 90 to 80% by weight of waste asphalt mixture, an appropriate viscosity can be obtained and the formability of the stone material can be obtained. As a result, a molded product having high strength can be obtained. That is,
When the thermoplastic is added and kneaded with the molten asphalt pitch, the viscosity gradually increases, and when the amount of the thermoplastic added is small, improvement in strength due to the addition of the thermoplastic cannot be expected. On the other hand, if the addition amount of the thermoplastic is too large, the viscosity becomes too high, air is often mixed into the inside of the molded product, and deaeration becomes difficult, so that so-called cavities are easily formed, and rather the molded product The strength will be reduced.

Further, in the method for producing an artificial stone material, the cut rod-shaped kneaded material is rolled while being naturally cooled to round the corners and remove air bubbles contained in the vicinity of the surface. In this molding step, since the surface of the kneaded product is not immediately hardened, the internal stress generated as the melted and expanded kneaded product inside is cooled from the surface can be gradually released. Next, while further molding the kneaded product, by spraying water or blowing air, the cooling is gradually promoted from the surface to be cured, and thereafter,
If necessary, the artificial stone material, which is a molded article, is forcedly cooled by sprinkling water or immersing it in water. In this manufacturing method,
Since the surface is not cured immediately after molding the kneaded product, cracks and the like do not occur on the surface of the molded product, and an artificial stone material of excellent quality can be obtained.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of a method for manufacturing an artificial stone material and a manufacturing apparatus therefor according to the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the artificial stone material according to the present invention is manufactured from a waste asphalt mixture 10 containing asphalt pitch and crushed stone as main components, and a thermoplastic 12. The waste asphalt mixture 10 is made by excavating the asphalt mixture that was constructed on the road etc. into a block shape by repair and repair work, or scraping or crushing the asphalt road surface such as the road to a size of 10 to 30 mm with a cutter. It is used, and by its nature, it does not matter at all if it contains materials other than asphalt mixture. Asphalt mix usually has an asphalt pitch of about 3 to
It is composed of a composition containing 8% of crushed stone and about 92 to 97% of crushed stone. Generally, what is available as the waste asphalt mixture 10 is used, but the composition is not limited to such a composition, and any composition of Needless to say, asphalt mixture may be used.

On the other hand, the thermoplastic 12 is not only industrial waste having various shapes discharged in the process of manufacturing industrial products, but also trays and bottles discharged from general households,
Alternatively, it also includes any plastic waste such as foam cushioning material. Examples of the thermoplastic 12 include polystyrene, polyethylene,
Examples thereof include polypropylene, polyvinyl chloride, ABS and methacrylic resin, but it goes without saying that they are not limited thereto. The melting point of the thermoplastic 12 is preferably close to the melting point of asphalt pitch, but in particular, it may have a melting point equal to or lower than the ignition temperature (about 300 ° C.) of asphalt pitch.

The amount of the thermoplastic resin 12 added is preferably about 10 to 20% by weight, when the amount of the waste asphalt mixture 10 is 90 to 80% by weight. The amount of the thermoplastic 12 added varies depending on its type. For example, polystyrene is about 15 to 20% by weight, polyethylene is about 10 to 15% by weight, and polypropylene is about 1%.
0 to 15% by weight, polyvinyl chloride is about 15 to 20% by weight
It is preferably added. However, the type of resin contained in the thermoplastic 12 obtained as waste is rarely constant, and the above-mentioned about 10 to 20% by weight.
It is preferable to select an appropriate amount depending on the viscosity when kneaded with asphalt pitch. Since the thermoplastic resin functions as a binder of crushed stone together with the asphalt pitch, it has a quantitative limitation, but the thermosetting plastic can be appropriately added like other additives.

The artificial stone material according to the present invention is obtained by heating and melting the waste asphalt mixture and the thermoplastic while agitating and mixing the molten asphalt pitch and the thermoplastic with stirring almost uniformly. The kneaded product thus obtained is appropriately divided into small pieces each having a substantially constant size and shape, the small pieces are molded in a molding apparatus, and then cooled. Device 13 for heating and melting the waste asphalt mixture and the thermoplastic while stirring
Is composed of a mixer 14 and a heating device 16, for example, as shown in FIG.

That is, the mixer 14 is a cylindrical rotary container 18, and is spirally arranged and fixed on the inner surface of the rotary container 18, and agitates the waste asphalt mixture 10 and the thermoplastic 12 charged therein. A stirring blade 20 and a pair of bearing portions 22 that rotatably support the rotary container 18,
A drive device (not shown) that drives the rotary container 18 to rotate in the forward or reverse direction, and a charging port 24 at one end of the rotary container 18.
And a discharge port 26 at the other end. Further, the heating device 16 is provided with a nozzle 30 that radiates a flame 28 by burning a gas fuel or a liquid fuel, and is configured so that the temperature inside the rotary container 18 can be appropriately adjusted by arbitrarily changing the heating power.

The mixer 14 stirs the waste asphalt mixture 10 and the thermoplastic 12 charged from the charging port 24 with the stirring blade 20 while rotating the rotary container 18, and at the same time, the flame 28 from the nozzle 30 of the heating device 16. Radiates, waste asphalt mix 10 and thermoplastic 1
Heat 2 to melt. In addition, waste asphalt mixture 1
Since 0 and the thermoplastic 12 are stirred by the stirring blade 20, the temperature rises almost uniformly, and the flame 28 does not ignite the waste asphalt mixture 10 or the like.

Here, a predetermined amount of the waste asphalt mixture 10 and the thermoplastic 12 may be simultaneously charged into the rotary container 18 of the mixer 14 and heated and melted. Alternatively, first, the waste asphalt mixture 10 is put into the rotary container 18 and heated to about 150 to 200 ° C. to be melted, and then the thermoplastic 12 is put into the rotary container 18.
About 180 to 230 ° C., preferably 180
It is also possible to heat them to about 200 ° C. to melt them, and stir and knead them. When the thermoplastic 12 is foamed, the foamable resin is heat-reduced by adding these thermoplastics 12 in a state where the waste asphalt mixture 10 is heated and melted, It is preferable because it becomes a kneaded product after that efficiently. Further, it is possible to heat and melt the thermoplastic 12 by a device other than the mixer 14 and add the melted thermoplastic 12 into the rotary container 18, which is not particularly limited. Not done. The heating temperature of the obtained kneaded product mainly depends on the melting temperature of the resin. Further, the molten thermoplastic 12 is kneaded with the similarly melted asphalt pitch and functions as a binder for crushed stone. The viscosity of the obtained kneaded product is the thermoplastic 12
Will be determined by the amount added. Therefore, the viscosity of the kneaded product can be adjusted by appropriately adjusting the amount of the thermoplastic 12 added.

As described above, the waste asphalt mixture 10
Is melted to form a mixture of asphalt pitch and crushed stone, and the melted thermoplastic 12 and asphalt pitch are stirred and kneaded to be mixed almost uniformly to obtain a kneaded product. Then, the obtained kneaded product is divided into small pieces, molded, and cooled to manufacture an artificial stone material such as an artificial boulder.

As an example of an apparatus for producing an artificial stone material from the obtained kneaded product, as shown in FIG. 2, the above heating / melting / stirring / kneading device 13 and the kneaded product obtained by this heating / melting / stirring kneading device 13 are formed into a rod shape. A rod-shaped forming device 32 for forming, a cutting device 34 for cutting the rod-shaped kneaded material into an appropriate size,
A molding and cooling device 36 is provided for cooling the cut kneaded material while rolling and molding.

As shown in FIG. 3, the rod-shaped forming device 32 has a cylindrical container 43 having an inlet 40 for the kneaded material 38 and an opening 42 through which the kneaded material 38 is pushed out, and the kneaded material 38.
And a drive motor (not shown) for rotating the screw 44. Therefore, the kneaded material 38 in which the thermoplastic resin 12 and the asphalt pitch are melted and stirred and kneaded by the heating, melting, stirring and kneading device 13 is charged into the cylindrical container 43 through the charging port 40, and the screw 44 is driven by the drive motor. The kneaded material 38 is rotated and extruded through the opening 42 to form a rod shape. Then, the kneaded material 48 formed into a rod shape is cut into an appropriate length by the cutting device 34.
Here, the diameter of the opening 42, that is, the diameter is set according to the size of the artificial boulder to be manufactured, and is not particularly limited, but is set to, for example, 20 to 50 mm.

The cutting device 34 includes a rotary blade 50 having one or a plurality of blades, and a drive device 52 for rotating the rotary blade 50.
The rotary blade 50 is rotated by the drive device 52 at a substantially constant speed arbitrarily set. On the other hand, the kneaded material 38 put into the cylindrical container 43 is extruded from the opening 42 in a rod shape at a substantially constant speed, and the kneaded material 48 extruded in a rod shape is rotated at a substantially constant speed. Cut by 50 to a substantially constant length. The rotation speed of the rotary blade 50 and the rod-shaped forming device 32
The size of the extruded kneaded material 48 is determined by appropriately adjusting the extrusion rate from the, and thus the size of the artificial boulder to be manufactured is determined.

The kneaded material 48 cut into a substantially constant length is supplied to the molding cooling device 36 as shown in FIGS. 2 and 4. In this embodiment, the molding cooling device 36 is composed of a first molding cooling device 54 and a second molding cooling device 56, and the cylindrical drum 58 of each of the devices 54, 56 has its central axis. It is arranged so as to be inclined with respect to the horizontal direction, is rotatably supported by a bearing 60, and is configured to be rotated at a substantially constant speed about its central axis by a drive device (not shown). There is. Here, the rotational speed and the inclination angle of the drum 58 in the molding cooling device 36, particularly in the first molding cooling device 54, form the kneaded material 48 into a substantially round shape, and at the same time, the plurality of kneaded materials 48 adhere to each other and are integrated. It is important that the rotation speed is about 1 to 5 m /
Minutes are preferable, and the inclination angle α is preferably about 5 to 10 degrees.

In the first molding cooling device 54, for example, the kneaded material 48 cut into a cylindrical shape is rolled onto the inner surface of a rotating drum 58 to crush the corner portions of the kneaded material 48 into a round shape. At the same time as the molding, during the molding process, of the bubbles existing inside the kneaded material 48, at least the bubbles near the surface are discharged to the outside. In this way, the kneaded material 48 is formed into a substantially spherical shape and the surface is densely formed, and at the same time, heat is radiated from the kneaded material 48 and naturally cooled,
Avoid as much internal stress as possible.

On the other hand, the second molding / cooling device 56 comprises one or a plurality of spray nozzles 62 for spraying water into the rotating drum 58, and a water spray nozzle 64. Therefore, while the kneaded material 48 formed into a substantially spherical shape by the first forming and cooling device 54 is formed so as not to be further deformed, it is cooled substantially uniformly by the water sprayed from the spray nozzle 62 to harden the surface, An artificial boulder 66, which is one of the artificial stone materials, is obtained. Manufactured artificial boulders 66
Since the surfaces are hardened, they do not stick to each other and maintain their molded shape. However, since the inside of the obtained artificial boulder 66 is not sufficiently cooled, the inside thereof is in a molten state depending on the size of the artificial boulder 66. Therefore, particularly large artificial boulders 66 are sprinkled with water from the sprinkling nozzle 64 and cooled to the inside.

Here, when water is directly applied to the artificial boulders 66 that have not been sufficiently cooled, the surface of the manufactured artificial boulders 66 is immediately hardened, but the inside thereof is in a molten state, so The product value may be lost due to cracks. Therefore, the amount of water sprayed from the spray nozzle 62 is important, for example, the diameter is about 5
In the case of the artificial cobblestone 66 having a diameter of about 0 mm, it is preferable to spray the water with an amount of about 10 to 50 liter / m ² per surface area of the artificial cobblestone 66.

Artificial cobblestone 6 manufactured by the above method
6 is because the crushed stones in the waste asphalt mixture 10 are densely solidified by the molten material in which the molten asphalt pitch and the thermoplastic 12 are mixed and melted, and thus the strength of the obtained artificial boulder 66 is obtained. Will be very high. Since it is difficult to cut out to measure the compressive strength of cobblestone, it is said that the same material makes it a substitute for a press-molded product.Therefore, a melt-kneaded product is molded by a press to prepare a sample for measurement and destroyed. The strength was measured. as a result,
The fracture strength of the sample obtained by press molding the melt-kneaded product is shown in FIG.
Was in the range indicated by A. B and C shown in FIG. 5 indicate the compressive strengths of asphalt concrete and Portland cement, respectively. As is clear from this figure, the artificial stone material of the present invention is useful for products requiring compressive strength.

Although the embodiments of the method and apparatus for manufacturing an artificial stone material according to the present invention have been described above in detail, the present invention is not limited to the above embodiments.

For example, the molding cooling device 36 shown in FIG.
Is divided into a first molding cooling device 54 and a second molding cooling device 56, but may be divided into three or more parts, or conversely, a single drum 58 may be integrated. It is also possible to configure. Further, after the surface of the artificial boulder 66 is hardened by spraying water, the artificial boulder 66 is discharged from the molding and cooling device 56 to the outside, and sprinkled with water while being conveyed by, for example, a belt conveyor or immersed in water. Alternatively, it may be configured to cool. Further, it is possible not only to cool by spraying water, but also to send cold air for cooling.

Further, as shown in FIG. 6, the forming and cooling device 68 in the artificial boulder manufacturing apparatus comprises a flat plate 7 facing each other.
One flat plate 70 of 0 and 72 is configured to rotate (X) and relatively revolve (Y),
It is also possible to sandwich the cylindrical kneaded material 48 between the flat plates 70 and 72 and forcibly twist it to form a substantially spherical shape. With this configuration, the molding speed is improved.

Further, the shape of the rod-shaped kneaded material formed by the rod-shaped forming device 32 shown in FIG. 3 is not limited to a columnar shape, and may be, for example, an elliptic columnar shape, or a triangular columnar shape, a square shape. It may be columnar or the like.
By setting various shapes of the kneaded material 48, it becomes possible to manufacture the obtained artificial cobblestone in a shape other than a spherical shape. Further, after being formed into a spherical shape, it may be crushed slightly to manufacture an artificial boulder having a changed shape, or press forming may be incorporated in the forming step.

Next, in order to produce an artificial boulder from the kneaded material 38 produced by the heating, melting, stirring and kneading device 13,
The method of dividing and kneading the kneaded material 38 into a desired size is not limited to the above-described embodiment. For example, various methods may be employed, such as cutting the kneaded material 38 spread in a strip shape as appropriate, or scraping the kneaded material of a desired size from the block-shaped kneaded material 38. You can

Further, the kneaded material 48 is passed through the molding cooling device 36 or the like.
In molding, for example, natural or artificial sand or granular material is arranged on the inner surface of the drum 58, and the kneaded material 48 is rolled and molded on the surface of the kneaded material 48 at the same time. It is also possible to attach particles or the like to manufacture the artificial boulders 66 having different surface states.

Various embodiments of the method and apparatus for manufacturing artificial boulders according to the present invention have been described above with reference to the drawings.
It goes without saying that the invention is not limited to the embodiments shown. The heating means for heating and melting the waste asphalt mixture or the thermoplastic in the manufacturing apparatus according to the present invention is not limited to one that radiates a flame in the mixer, but hot air is supplied to the waste asphalt mixture by the hot air. It may be heated and melted. Alternatively, the heating means may be provided outside the mixer, and the cylindrical rotary container of the mixer may be heated from the lower side, and there is no particular limitation.

In addition, the waste asphalt mixture is heated and melted in the rotary container, and the mixture is stirred and kneaded. Then, the rotary container is sealed and vacuum-sucked to obtain a melt-kneaded mixture of the waste asphalt mixture and the thermoplastic. It is also possible to deaerate the air entrained in the kneaded product and then to fill the kneaded product into the rod-shaped forming device. Alternatively, the cylinder of the rod-shaped forming device may be hermetically sealed and vacuum-sucked to deaerate the air trapped in the kneaded material. With this configuration, it is possible to form an artificial boulder having a higher density. Alternatively, conversely, after stirring and kneading under pressure in a rotating container, the pressure may be released to atmospheric pressure, and the bubbles may be discharged to the outside by the internal pressure of the bubbles trapped in the kneaded product. . Further, it is also possible to appropriately construct by forming air bubbles in the kneaded material by positively enclosing them to form a lightweight artificial boulder having water permeability and sound absorption.

Further, when the waste asphalt mixture and the thermoplastic are melted by heating and kneaded with stirring,
Chips obtained by crushing non-thermoplastics, non-melting fiber materials such as glass fibers, or metal chips may be kneaded. Further, the use of the artificial cobblestone according to the present invention can be used for paving stones around trunks such as garden trees, and decorative applications such as paving stones for promenades, etc., and can also be used as a cobblestone for roadways and sidewalks Is also possible. In addition, it is useful as a burial stone laid on the ground of roads and other civil engineering works and the foundation of construction work, or by taking advantage of its higher compressive strength than concrete, part of concrete for construction of dams etc. There is a usage such as burying in place of the above, and the usage is not particularly limited. In addition, the present invention can be carried out in various modified, modified, and modified embodiments based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

[0042]

EFFECTS OF THE INVENTION The artificial stone material according to the present invention heats and melts waste asphalt mixture and thermoplastics and kneads them with stirring almost uniformly, and then separates the obtained kneaded material into small pieces of appropriate size. Since the small lumps are molded and cooled to be manufactured, the moldability is excellent, the strength of the obtained artificial stone material is high, and the safety to humans and nature is excellent. Further, by adding the thermoplastic resin in a ratio of 10 to 20% by weight to 100% by weight of the waste asphalt mixture, it is possible to manufacture an artificial stone material such as an artificial boulder which is more excellent in moldability and has high strength.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing a kneaded material manufacturing method and manufacturing apparatus for manufacturing an artificial stone material according to the present invention.

FIG. 2 is a view showing a method and a manufacturing apparatus for manufacturing an artificial stone material according to the present invention, FIG. 2 (a) is an explanatory view showing the outline of the manufacturing equipment, and FIG. 2 (b) is an artificial stone material. FIG. 6 is a schematic explanatory view showing a manufacturing process of.

FIG. 3 is an explanatory view showing an embodiment of a rod-shaped forming device and a cutting device of the artificial stone material manufacturing apparatus according to the present invention.
(a) is a fragmentary side view of the main part, and (b) is a front view.

FIG. 4 is a cross-sectional explanatory view showing an embodiment of a forming / cooling device of the artificial stone material manufacturing apparatus according to the present invention.

FIG. 5 is a diagram showing the relationship between temperature and compressive strength for an artificial cobblestone, asphalt mixture and concrete according to the present invention.

FIG. 6 is an explanatory view showing another embodiment of the forming / cooling device of the artificial stone material manufacturing apparatus according to the present invention.

[Explanation of symbols]

 10; Waste asphalt mixture 12; Thermoplastics 13; Heating, melting, stirring and kneading device 14; Mixer 16; Heating device 18; Rotating container 20; Stirring blade 24; Input port 26; Discharge port 32; Rod forming device 34; Cutting device 36, 68; Molding / cooling device 38; Kneaded material 48; Kneaded material formed in a rod shape 58; Drum 62; Spray nozzle 64; Water spray nozzle 66; Artificial boulder

Claims (5)

[Claims] 1. A waste asphalt mixture mainly composed of asphalt pitch and crushed stone and a thermoplastic are heated with stirring to melt the asphalt pitch, and at the same time, to melt the thermoplastic to produce the molten asphalt pitch. An artificial stone material characterized in that after substantially kneading and stirring with a molten thermoplastic, the resulting kneaded product is separated into small pieces of an appropriate size, and cooled while preventing recombination of the small pieces. Manufacturing method. 2. The asphalt pitch and the waste asphalt mixture containing crushed stone as a main component and the thermoplastic are heated with stirring to melt the asphalt pitch, and at the same time to melt the thermoplastic to obtain the molten asphalt pitch. After stirring and kneading the melted thermoplastics substantially uniformly, the obtained kneaded product is formed into a rod shape and cut into an appropriate size, and the cut kneaded product is rolled and cooled while being molded. Method for manufacturing artificial stone. 3. Manufacture of an artificial stone material according to claim 1 or 2, wherein thermoplastic resin is added in a ratio of 10 to 20% by weight to 90 to 80% by weight of the waste asphalt mixture. Method. 4. The rolled kneaded product is rolled and molded, while being gradually cooled with water or air, and then, if necessary, forcedly cooled with water or air. A method for manufacturing an artificial stone material to be described. 5. The asphalt pitch and the waste asphalt mixture containing crushed stone as a main component and the thermoplastic are heated with stirring to melt the asphalt pitch, and at the same time to melt the thermoplastic to produce the molten asphalt pitch. A heating, melting, stirring and kneading device that stirs and kneads molten thermoplastics substantially uniformly, a rod-shaped forming device that forms the obtained kneaded product into a rod shape, and a cutting device that cuts the rod-shaped kneaded product into an appropriate length. And a molding cooling device that cools the cut kneaded product while rolling and molding the kneaded product.