JP2006265943A - Spray method and spray construction system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spray method and a spray construction system, capable of decreasing the a sampling amount of resources by reusing a waste product, thereby reducing the influence given to the environment and, at the same time, decreasing the cost for execution of work. <P>SOLUTION: Water is added to artificial sand consisting of the waste product, at least containing a clay component and the waste product containing a lime component, the artificial sand is kneaded under a pressurized environment to manufacture a ground material, and the ground material is sprayed on the surface to be sprayed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a spraying method and a spraying construction system in which artificial sand made of waste such as sludge, paper sludge, and lime refining residue is used as a ground material and sprayed onto a surface to be sprayed such as a slope.

  In the case of a reservoir or a waste disposal site, it is necessary to form a base layer having water shielding properties. Conventionally, the base layer has a structure in which a water shielding layer that prevents leakage of water and harmful substances and a protective layer that prevents damage and deterioration of the water shielding layer due to foreign materials, heavy machinery, ultraviolet rays, etc. during operation are laminated. For example, a well-known water-shielding sheet and a curing mat are double-laid as a water-shielding layer, a well-known light-shielding sheet is laid on the double-layer, and the upper surface is covered with a protective layer such as earth and sand, tatami mats, tires, Consists of configuration.

In addition, it is necessary to form a stable base layer on the slope in order to prevent the collapse of the ground and the erosion of the slope. Conventionally, the stable base layer is formed by spraying mortar or concrete having a predetermined strength on a slope.
In some cases, a vegetation basement layer is formed on rocky ground or on the slopes of harmful soils and greened. Conventionally, the vegetation base layer is formed by spraying the soil with a mixture of seeds and fertilizer thickly on the slope.

On the other hand, in recent years, a method for reusing industrial waste to form a plant growth base has been proposed. This is a construction method in which paper sludge incineration ash and cement are mixed and sprayed onto a plant crush chip (see, for example, Patent Document 1).
JP 2004-100318 A

  However, since the above-described conventional base layer having water-impervious properties is formed by laminating a plurality of materials such as a water-impervious sheet, the base layer becomes thick and the capacity of the reservoir and the waste treatment plant is reduced. At the same time, there is a problem of cost. In addition, since the water shielding sheet has a low resistance to external force, there is a risk that the water shielding sheet may be damaged during operation, and water and harmful substances may leak out. There is a problem that water and harmful substances may leak from the section. Furthermore, there is a problem that the slope of the slope needs to be gradual in order to prevent the protective layer from being lost, and a large site is required.

In addition, the above-mentioned conventional stable base layer uses a large amount of natural resources such as cement, sand, and gravel, which is a waste of resources and has an impact on the environment due to resource procurement, and the construction cost also increases. There is a problem.
In addition, in the conventional vegetation base layer described above, a bonding agent for preventing scouring, or a reforming material such as a water retentive granule forming material or a tie material for ensuring water retention, is mixed, and the construction cost is reduced. There is a problem of becoming higher.

  In addition, in the conventional method of reusing industrial waste as described above to form a plant growth base, the ground material to be sprayed is less sticky, so if it is sprayed on a steep slope, it will flow, resulting in a uniform thickness. There is a problem that cannot be sprayed.

  The present invention takes the above-mentioned conventional problems into consideration, and reduces the amount of resources collected by reusing waste, thereby reducing the impact on the environment and reducing the construction cost. An object is to provide a spraying method and a spraying construction system. Moreover, it aims at providing the spray construction method and spray construction system which can be sprayed also on a steep slope (surface to be sprayed). Another object of the present invention is to provide a spraying method and a spraying construction system that can form a layer having excellent durability, water-proofing and light-shielding properties without laminating a plurality of layers, and can reduce the overall layer thickness. And

  The invention according to claim 1 is a method for producing ground material by adding water to artificial sand composed of waste containing at least a clay component and waste containing a lime component, and kneading the artificial sand in a pressurized environment. The ground material is sprayed onto the surface to be sprayed.

  Since the lime component is self-hardening, the artificial sand composed of the waste containing the clay component and the waste containing the lime component becomes a stable granular material that does not re-mudder even when added. Therefore, according to the feature of the invention according to claim 1, when artificial sand is kneaded in a pressurized environment, the unreacted clay component contained in the artificial sand covers the surface of the artificial sand granule, Since the clay component reacts with the lime component contained in the artificial sand and gradually solidifies, the ground material changes to a highly sticky material while remaining granular. In addition, since this ground material is consolidated over time, the strength of the ground formed by spraying the ground material onto the surface to be sprayed (hereinafter referred to as a spray layer) increases.

  The invention according to claim 2 is characterized in that, in the spraying method according to claim 1, a solidifying material is added to the artificial sand and stirred.

  Due to such characteristics, the development strength of the ground material is further increased by the solidifying material. In addition, the strength of the ground material increases in proportion to the amount of solidification material added.

  The invention described in claim 3 is characterized in that, in the spraying method according to claim 1 or 2, a mixed liquid is mixed into the ground material immediately before spraying on the surface to be sprayed.

  Because of these characteristics, the water-blocking performance of the spray layer is enhanced, and the lime component remaining in the clay component is solidified by reacting with the liquid mixture, so the expression strength of the ground material sprayed on the surface to be sprayed is almost It does not decline. Further, when the ground material is sprayed on the surface to be sprayed, the rebound of the ground material is reduced, and the adhesion performance of the ground material is increased.

  The invention described in claim 4 is characterized in that, in the spraying method according to any one of claims 1 to 3, vegetation material is mixed in the artificial sand and stirred.

  With such a feature, the ground material mixed with the vegetation material is sprayed onto the surface to be sprayed, and a spray layer in which the vegetation material is embedded is formed. In addition, since a spraying layer is a layer in which many voids are formed and has excellent water retention, plant growth is promoted.

    Invention of Claim 5 is a spray construction system provided with the ground material manufacturing system part which manufactures ground material, The ground material manufacturing system part contains the waste and lime component which contain a clay component at least And a pressure kneading apparatus for adding the artificial sand to the artificial sand composed of waste to knead the artificial sand in a pressurized environment.

  Due to such characteristics, artificial sand is hydrated and kneaded in a pressurized environment, and the surface of the artificial sand granules is coated with unreacted clay components, and this clay component is added to the lime contained in the artificial sand. It reacts with the ingredients and gradually solidifies.

  According to the spraying method according to claim 1 of the present application, since the ground material has high adhesiveness, it can be sprayed even on a steep slope. In addition, since the ground material solidifies over a long period of time and increases its strength, it can exhibit considerable strength, and the spray layer formed by the ground material has durability that can prevent breakage and damage. An excellent layer. In addition, the spray layer formed of the ground material is excellent in light-shielding properties, and has a protective performance (endurance performance) and a light-shielding performance, so there is no need to laminate the protective layer and the light-shielding layer. The overall layer thickness can be reduced. In addition, since the ground material is made of inexpensive artificial sand that reuses waste, it is possible to reduce the construction cost of spraying work and to dispose of waste through the effective use of waste. Waste disposal costs can be reduced. Furthermore, by reusing waste, it is possible to reduce the use of resource materials and to reduce the environmental impact of resource collection.

  Moreover, according to the spraying method which concerns on Claim 2, since the expression intensity | strength of ground material increases with a solidification material, the failure | damage and damage of a spraying layer can be prevented. Moreover, the intensity | strength of a spraying layer can be adjusted by adjusting the mixing amount of a solidification material.

  Moreover, according to the spraying method which concerns on Claim 3, a spraying layer becomes a layer excellent in water shielding, and can form the layer excellent in durability, light-shielding property, and water shielding. As a result, the overall layer thickness can be reduced. In addition, the water-blocking performance of a spraying layer can be adjusted by selecting the kind of liquid mixture suitably.

  Moreover, according to the spraying method which concerns on Claim 4, since a spraying layer becomes a layer suitable for the growth promotion of a plant, the greened vegetation layer can be formed.

  Moreover, according to the spray construction system which concerns on Claim 5, while being able to manufacture a ground material with high adhesiveness with a granular form, the ground material solidified with progress of time over a long period can be manufactured. . As a result, it is possible to spray steep slopes and to build a high-strength spray layer.

Hereinafter, embodiments of the spraying method and the spraying construction system according to the present invention will be described with reference to the drawings.
The schematic configuration of the present embodiment is based on the use of artificial sand produced by lime-treating fine-grained soil, and the solidified material and vegetation material are added and stirred to the artificial sand so that the solidified material and vegetation material are Water is added to the added artificial sand, and the ground artificial material is kneaded in a pressurized environment to produce a ground material, and this ground material is pumped and sprayed toward the sprayed surface. Immediately before spraying on, the mixed solution is mixed with the ground material. Further, in order to prevent cracking due to drying, a fibrous reinforcing material may be added and stirred to the artificial sand, thereby improving toughness and preventing cracking.

First, the material used for the spraying method according to the present embodiment will be described.
Artificial sand is produced by mixing waste containing a clay component and waste containing a lime component, and a solidifying material such as blast furnace cement, an admixture or the like is mixed as necessary. Specifically, sludge is used as waste containing clay components, and paper sludge incineration ash (hereinafter referred to as PS ash) is used as waste containing lime components. The sludge is dehydrated and solidified. By mixing and pulverizing PS ash into the press cake and granulating it, the raw material granule with a structure in which ash fine powder adheres to the surface of the clay grain (so-called ash fine powder is coated on the surface of the clay grain) The raw material granule is prepared and mixed with a solidifying material such as blast furnace cement or an admixture. As shown in FIG. 1, artificial sand is obtained by adding a solidifying material 3 such as blast furnace cement to a raw material granular material having a structure in which PS ash 2 adheres to the surface of clay particles 1 of about 5 mm or less, It is a material that has been stably treated by pozzolanic reaction and the like, and is a stable granular material that does not re-mudder even when added with water. In addition, since PS ash 2 (lime component) is self-hardening, a solidification material, an admixture, etc. do not need to be mixed.

  PS ash is an incineration ash produced by incinerating paper sludge generated in the process of recycling used paper, or a modified incineration ash prepared by incinerating the mixture of lime refining residue when paper sludge is incinerated. . The lime refining residue is generated in the production process of fine calcium carbonate powder used as a coating material for paper products, for example, and its main component is calcium hydroxide. It is landfilled as waste. In addition, what is necessary is just to set suitably the mixing amount of the lime refinement | purification residue with respect to paper sludge, but when adjusting a mixing amount so that the lime component (CaO) contained in PS ash produced | generated by incineration will be about 20-30%. In that case, the mixing amount per ton of paper sludge may be about 50 kg.

  In addition, cement and lime-based materials are used as the solidifying material to be added / stirred to the manufactured artificial sand, and plant seeds, bark compost and dry paper sludge are used as the vegetation material to be added / stirred to the artificial sand. Organic waste (fertilizer) such as wood chips and fiber scraps is used. Moreover, as a mixed liquid to be mixed with the ground material immediately before spraying, water, a kneaded muddy water obtained by kneading sludge and water, a bentonite kneaded muddy water obtained by kneading bentonite waste liquid and water, etc. are used. It is desirable to effectively use waste such as bentonite waste liquid. Furthermore, the reinforcing material is a steel or chemical fiber fiber, and may be organic fiber scraps, inorganic sludges such as paper sludge, polypropylene sheets, etc., and it is desirable to effectively use waste.

Next, the spray construction system used for the spray construction method according to the present embodiment will be described.
FIG. 2 shows a spray construction system. As shown in FIG. 2, the spray construction system is roughly divided into a ground material manufacturing system unit 10 for manufacturing a ground material, and a mixed liquid is manufactured and mixed with the ground material immediately before the ground material is sprayed. And a mixed liquid production system unit 11 to be made.

  The ground material manufacturing system unit 10 includes a hopper 12 into which artificial sand is introduced from an insertion port 12a, a measuring mixer 13 for measuring a predetermined amount of artificial sand, and additives such as a solidifying material, a vegetation material, and a reinforcing material to the artificial sand. Agitating mixer 14 for adding / stirring, and water added to the synthetic artificial sand composed of artificial sand and additive, kneaded for a predetermined time in a pressurized environment, and pressure-kneaded for high-pressure feeding to a pressure-feed pipe (delivery hose 16) It consists of a device (mortar gun 15). The discharge port 12b of the hopper 12 and the input port 13a of the weighing mixer 13 are connected via the first conveyor 17, and the discharge port 13b of the measurement mixer 13 and the input port 14a of the stirring mixer 14 are connected via the second conveyor 18. The discharge port 14b of the stirring mixer 14 and the input port 15a of the mortar gun 15 are connected via a third conveyor 19, respectively.

  The mixed liquid production system unit 11 includes a kneaded mud production mixer 20 for producing kneaded sludge and bentonite kneaded sludge by adding and kneading water to a press cake made of sludge, bentonite waste liquid, and the like, and an outlet 20a of the kneaded muddy water production mixer 20. And a pump 22 that pumps a mixed liquid such as water, kneaded muddy water, bentonite kneaded muddy water or the like through a pressure hose 21 connected to the tip of the delivery hose 16.

Next, the process of constructing a spray layer by the spray method according to the present embodiment will be described.
The spraying layer constructed by this spraying method is a lightweight, high-strength layer. Therefore, protection / shading layer to prevent damage to the water-impervious sheet at the waste disposal site, or slope protection of rocky ground It is also effective as a coating layer. In addition, the spray layer constructed by this spraying method has a permeability coefficient of k = 10 ⁻⁶ to 10 ⁻⁸ cm / sec or less by using high-concentration kneaded mud or swellable bentonite kneaded mud, It is also effective as a water-impervious layer that ensures water-imperviousness. In addition, when the mixed material is not mixed with the ground material or a small amount of mixed solution is mixed and sprayed, countless voids are formed in the spray layer, and the spray layer is made of porous PS ash. Water retentivity is extremely good, and the spray layer exhibits a strength of about 0.5 Mpa without adding a solidifying material. Therefore, the spray layer constructed by this spray method is easy to grow roots. It is also effective as a vegetation layer that is less eroded by rainwater.

  FIG. 3 is a diagram illustrating a manufacturing process of the ground material in the spraying method, and FIG. 4 is a diagram illustrating a process of spraying the ground material. Moreover, although the standard mixing | blending of the ground material for every use and a liquid mixture is shown in FIG. 5, it can adjust suitably as needed.

  As shown in FIGS. 2 and 3, first, the ground material manufacturing system unit 10 manufactures the ground material. Specifically, artificial sand manufactured in advance is introduced into the hopper 12 from the hopper insertion port 12a. The artificial sand thrown into the hopper 12 is discharged from the hopper discharge port 12 b onto the first conveyor 17, carried to the weighing mixer loading port 13 a by the first conveyor 17, and thrown into the weighing mixer 13.

  In the measurement mixer 13, the artificial sand is measured, and a predetermined amount of artificial sand is discharged onto the second conveyor 18 from the measurement mixer discharge port 13b. At this time, the artificial sand is weighed so as to have a predetermined composition (for example, a composition table shown in FIG. 5) according to the amount of the ground material to be manufactured. The artificial sand on the second conveyor 18 is conveyed to the stirring mixer charging port 14 a by the second conveyor 18 and is charged into the stirring mixer 14.

  In the stirring mixer 14, an additive added separately into the stirring mixer 14 is added to the artificial sand that has been carried in. When a spray layer is constructed as a protective layer, a light shielding layer, or a water shielding layer, a solidifying material such as cement is added to the artificial sand, and a reinforcing material such as steel or chemical fiber fiber is also added as necessary. At this time, the solidifying material is measured and added so as to have a predetermined composition (for example, a composition table shown in FIG. 5) according to the application. Moreover, when constructing a spraying layer only as a water shielding layer, it is not necessary to add a solidification material. Moreover, when constructing a spray layer as a vegetation layer, seeds and fertilizer (vegetation material) are added to artificial sand. When a spray layer is constructed as a vegetation layer, an organic material such as organic fiber waste or paper sludge is used as a reinforcing material in order to increase the amount of fertilizer components and improve toughness and erosion resistance. Then, the artificial sand, the added solidifying material, the reinforcing material, and the vegetation material are agitated to produce artificial sand containing the solidifying material (mixed artificial sand), and this mixed artificial sand is mixed with the stirring mixer outlet 14b. To the third conveyor 19. The synthetic artificial sand on the third conveyor 19 is carried to the mortar gun inlet 15 a by the third conveyor 19 and is put into the mortar gun 15.

  In the mortar gun 15, a small amount of water is added to the blended artificial sand, and the mixture is kneaded in a pressurized environment of about 1.0 Mpa or more for a predetermined time (specifically, about 2 to 5 minutes). Producing ground material. At this time, the water is measured and added so as to have a predetermined composition (for example, the composition table shown in FIG. 5). Then, the manufactured ground material is pumped into the delivery hose 16 by compressed air of a compressor (not shown) provided in the mortar gun 15.

On the other hand, as shown in FIG. 2 and FIG. 4, a mixed liquid is manufactured in the mixed liquid manufacturing system unit 11, and this mixed liquid is pumped to the tip of the delivery hose 16. Specifically, the kneaded mud water production mixer 20 kneads the press cake (clay) obtained by dewatering and solidifying sludge and bentonite waste liquid and water to produce a mixed liquid (kneaded mud water or bentonite kneaded mud water). At this time, the clay and water are blended so as to have a predetermined blend (for example, the blending table shown in FIG. 5) according to the application. In addition, although the water permeability coefficient which shows the water-blocking performance of a spraying layer is influenced also by the base material and density | concentration of a liquid mixture, when using the liquid mixture which consists only of water, it is about 10 ^{< -4} > ^-10 < ^-5 > cm / sec. When a mixed solution made of kneaded muddy water is used, about 10 ⁻⁵ to 10 ⁻⁶ cm / sec, and when a mixed solution made of swellable bentonite kneaded muddy water is used, 10 ⁻⁷ to 10 ⁻⁸ cm / sec. It will be about. Therefore, the protective layer where strength is important uses a low-concentration kneaded muddy water or a mixture of water only, and the water-impervious layer where water impermeability is important is a high-concentration kneaded mud or bentonite kneaded muddy water. Use liquid.

  Then, the above-described mixed liquid is pumped into the pumping hose 21 by the pressure of the pump 22, and flows into the distal end portion of the delivery hose 16 to be mixed with the ground material in the delivery hose 16. In addition, when constructing a vegetation layer, you may spray only a ground material, without mixing a liquid mixture.

  The ground material mixed with the liquid mixture is blown out from the tip of the delivery hose 16 by the pressure of the mortar gun 15. The worker A has the tip of the delivery hose 16 and directs it toward the surface B to be sprayed, so that the ground material is sprayed onto the surface B to be sprayed so as to be struck at high pressure. In the case of an example of a waste treatment plant, first, a spraying layer that also serves as a protection / light-shielding / water-blocking layer is constructed by laying a water-blocking sheet on the slope and spraying a ground material thereon.

  According to the spraying method described above, when the artificial sand is hydrated and then kneaded in a pressurized environment, the unreacted clay component contained in the artificial sand covers the surface of the reacted artificial sand granules shown in FIG. At the same time, since the clay component reacts with the lime component contained in the artificial sand and gradually solidifies, the ground material is changed into a highly sticky material in a granular form. Therefore, it is possible to spray even a steep slope of about 1: 1.5.

  Moreover, since the said ground material solidifies with progress of time over a long period of time, the intensity | strength of the spraying layer which consists of this ground material increases. Therefore, the spray layer is a layer excellent in durability that can exhibit considerable strength and can prevent breakage and damage.

  In addition, the spray layer constructed by the above construction method has excellent light shielding properties and has a protective performance (durability) and a light shielding performance, so there is no need to laminate the protective layer and the light shielding layer, The overall layer thickness can be reduced. Thereby, when using this spraying layer as a protective layer of a waste disposal site, the capacity of the disposal site can be increased.

  In addition, since the ground material is made of inexpensive artificial sand that reuses waste, it is possible to reduce the construction cost of spraying work and to dispose of waste through the effective use of waste. Therefore, it is possible to reduce waste disposal costs. Furthermore, by reusing waste, it is possible to reduce the use of resource materials and to reduce the environmental impact of resource collection.

  In addition, since the liquid mixture is mixed with the ground material immediately before spraying on the surface B to be sprayed, rebounding during spraying can be prevented, and the adhesion performance of the ground material can be increased. In addition, when a liquid mixture is mixed with the ground material, the surface of the artificial sand particles is coated with the mixture to increase the water shielding performance of the spray layer. -A layer excellent in light shielding properties and water shielding properties can be formed. As a result, the overall layer thickness can be reduced. Moreover, the water-blocking performance of a spraying layer can be adjusted by selecting the kind of liquid mixture suitably. In addition, since the coated liquid mixture is also solidified by the remaining lime component, the expression strength of the ground material sprayed on the surface to be sprayed hardly decreases.

Further, since the solidifying material is added and stirred in the artificial sand, the strength of the ground material is further increased by the solidifying material. Thereby, breakage and damage of the spray layer can be prevented. In addition, since the strength of the ground material increases in proportion to the amount of solidification material added, the amount of solidification material mixed can be adjusted by appropriately changing the amount of solidification material added according to the target strength of the spray layer. By doing so, the strength of the spray layer can be adjusted to some extent. For example, when no cement is added, the sprayed layer exhibits a strength of 0.5 Mpa at 28 days of age, and when the cement is 50 kg / m ³ , the sprayed layer exhibits a strength of 3-5 Mpa at the age of 28 days. Is 100 kg / m ³ , the spray layer has a strength of 7 to 10 Mpa at 28 days of age. Moreover, the addition amount with respect to this intensity | strength is less than half compared with the construction method using a mountain sand etc., and can aim at reduction of material cost.

  In addition, since the vegetation material is mixed in the artificial sand and agitated, the ground material mixed with the vegetation material is sprayed onto the surface to be sprayed to form a sprayed layer in which the vegetation material is embedded, and the vegetation layer is greened Can be formed. As a result, it is possible to construct a foundation in which the erosion-resistant ground and vegetation are integrated, and it is possible to construct a highly reliable vegetation board.

  As mentioned above, although embodiment of the spraying construction method and spraying construction system which concern on this invention was described, this invention is not limited to above-described embodiment, In the range which does not deviate from the meaning, it can change suitably. For example, in the above-described embodiment, the ground material is manufactured by mixing artificial sand and an additive such as a solidifying material at the site. Additives may be prepared, the prepared synthetic sand is brought into the field, this artificial sand is put into a mortar gun, water is added, and the mixture is mixed under a pressurized environment for a predetermined time, A ground material may be manufactured. Further, in the above-described embodiment, a mixed liquid to be mixed with the ground material is manufactured by kneading clay or the like with water in the field, but the present invention carries a pre-manufactured mixed liquid into the field. May be.

  Further, in the above-described embodiment, in order to prevent dry cracking of the spray layer, a reinforcing material such as a fiber made of chemical fiber is mixed in the ground material, but the present invention arranges reinforcing bars on the surface to be sprayed. Then, dry cracks may be prevented by embedding reinforcing bars in the spray layer.

It is a figure showing the artificial sand for demonstrating embodiment of the spraying construction method and spraying construction system which concern on this invention. It is a figure showing the spray construction system for demonstrating embodiment of the spray construction method and spray construction system which concern on this invention. It is a figure showing the manufacturing process of the ground material for demonstrating embodiment of the spraying construction method and spraying construction system which concern on this invention. It is a figure showing the spraying process of the ground material for demonstrating embodiment of the spraying construction method and spraying construction system which concern on this invention. It is a figure showing the standard mixing for demonstrating embodiment of the spraying construction method and spraying construction system which concern on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ground material manufacturing system part 11 Mixed liquid manufacturing system part 12 Hopper 13 Measuring mixer 14 Stirring mixer 15 Mortar gun (pressure kneading apparatus)
16 Delivery hose 20 Kneading muddy water production mixer 21 Pressure hose 22 Pump B Sprayed surface

Claims (5)

  Water is added to artificial sand composed of at least a clay component-containing waste and a lime component-containing waste, and the artificial sand is kneaded in a pressurized environment to produce a ground material. A spraying method characterized by spraying on the surface. In the spraying method according to claim 1,
A spraying method comprising adding a solidifying material to the artificial sand and stirring. In the spraying method according to claim 1 or 2,
Immediately before spraying on the surface to be sprayed, a mixed solution is mixed with the ground material. In the spraying method in any one of Claim 1 to 3,
A spraying method characterized by mixing vegetation material in the artificial sand and stirring. In the spray construction system equipped with the ground material manufacturing system section that manufactures the ground material,
The ground material manufacturing system section includes a pressure kneading apparatus for adding water to artificial sand composed of at least a clay component-containing waste and a lime component-containing waste and kneading the artificial sand in a pressurized environment. A spraying construction system characterized by being provided.

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