JPH0161122B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This is an invention of a method for manufacturing a soil paving material for civil engineering to be laid on sidewalks, school grounds, etc., and a paving method using the paving material.

(Conventional technology) Kanto loam, a reddish-brown volcanic ash clay, turns into mud when it absorbs moisture from rain, and when it dries, it becomes flying dust and causes severe damage, especially on school grounds and streets. The particle size of the main soil particles in this flying dust is less than 0.5 millimeters (m/m).

In general, soil particles, which are the smallest units that make up soil, have moisture called adsorbed water on their outer periphery, and the single particles adsorb each other to form aggregates, but when they dry and the adsorbed water evaporates, The adsorption effect is lost and the aggregates are dispersed into single particles. If many of the dispersed soil particles have a particle size of 0.5 mm or less, there is a high probability that they will become flying dust.

Conventionally, as shown in Japanese Patent Application Laid-Open No. 57-141483,
Some clay soils, such as Kanto loam, are mixed with lime and hydraulic cement, stirred to form granules, and then laid on the grounds.

Furthermore, as shown in Japanese Patent Application Laid-Open No. 54-1929, shirasu (volcanic ash) is bonded using a binder such as epoxy resin, polyester resin, furan resin, phenol resin, polyurethane resin, urea resin, or rubber latex. , which results in a water-permeable walkway with elasticity.

(Problem to be Solved by the Invention) However, as shown in JP-A-57-141483, when clay soil is granulated with an inorganic binder such as gypsum or cement, even though it has water permeability, the particles If it is hard and placed on the ground, children may be injured if they fall.

Furthermore, granulation of clayey soil requires mass production.

Furthermore, the rubber latex disclosed in Japanese Patent Application Laid-Open No. 54-1929 not only ages but also has poor water resistance. Other synthetic resin binders also have poor weather resistance and become scum and dust.

In the present invention, compared to these conventional binders, the use of an organic liquid adhesive made of acrylic acid ester provides excellent weather resistance, and as a result, the granules maintain their shape and elasticity for a long period of time. Based on this new knowledge, they achieved the present invention and succeeded in mass production of granulated clay soil.

(Means for solving the problem) By using clay as the main material and adding an acrylic acid ester liquid stabilizer to it as an adhesive between soil particles, we can create a material that is intermediate between the liquid limit and the plastic limit, that is, the plastic range. Grind and stir using a roller mixer while maintaining the water content of
A mixed soil consisting of aggregates with a film of the liquid adhesive attached around the soil particles is formed, and this mixed soil is fed into an outer cylinder equipped with a perforated plate with a hole diameter of 2 to 30 mm at the tip, and then outside. The inside of the cylinder is pressure-fed toward the tip, and the short cylindrical granules discharged from the perforated plate are rolled on a spiral vane rotating inside the vertical cylinder and shaped into spherical aggregates.
The soil is continuously discharged from the bottom of the vertical cylinder to form a sized soil mass.

Next, a binder with strong caking power and high stability, such as liquid acrylic ester with a thickener added to make it into a starch syrup, is mixed with a plurality of sized soil blocks, and the sized soil blocks are combined into one body. This is glued, spread on the ground, and the surface is rolled with rollers to join each sized soil mass and pave the ground.

(Function) When the material of the present invention is pulverized and agitated using a roller mixer, a mixed soil is formed of aggregates of soil particles around which a film of an acrylic acid ester liquid stabilizer is attached.

When this mixed soil is put into the outer cylinder and pumped, the mixed soil pushed out from the perforated plate at the tip bends and falls under its own weight, automatically forming short cylindrical granules A.

When this short cylindrical granule A is rolled on a spiral vane rotating inside a vertical cylinder, it rolls into a spherical aggregated soil lump B, which is continuously discharged from the bottom of the vertical cylinder. do.

Therefore, a binder with strong caking force and high stability, such as liquid acrylic ester with a thickener added to make it into a starch syrup-like form, and a plurality of spherical sized soil blocks B of the present invention.
When the sized soil lumps are glued together and spread on school grounds and streets, and the surface is compacted with a roller, rainwater permeates downward through the gaps between each aggregate, causing puddles on the road surface. will not occur.

Furthermore, the acrylic acid ester liquid stabilizer that surrounds each soil particle exhibits elasticity when dried.
There is no risk of injury even if the child falls.

In addition, since the sized soil clod B is composed of soil particles having a coating of acrylic ester on the surface, the soil particles adhere well for a long period of time, maintaining the aggregated form, and caking a large number of sized soil clods B. When mixed with a strong and highly stable binder and spread evenly for paving, each sized soil block B has no fear of turning into dust and is stable without losing its elasticity.

(Example) Add 50 to 200 kg of acrylic ester-based water-soluble synthetic resin adhesive as an organic stabilizer to 1000 kg of Kanto loam.

First, the Kanto loam soil is dried and crushed, passed through a vibrating sieve to remove impurities such as stones with a particle size of 2 mm or more, and dispersed into single particles, that is, soil particles. The water content ratio (water content ratio refers to the percentage of dry soil content and water content) was adjusted to approximately 60%, which is the plasticity range, and the mixture was crushed and mixed using a roller mixer.
30m/m) inside an outer cylinder with a spiral rotor and extruded from a perforated plate.

The extruded soil is broken and cut under its own weight, forming short cylindrical irregularly shaped granules A. This granulated material A is shaped into spherical particles or aggregates having a diameter of 2 to 30 mm while in a plastic state using a continuous granulating machine having a spiral blade plate 2 rotating within a vertical cylinder 1.

As shown in the drawing, the continuous granulating machine has a vertical shaft 3 around which a spiral vane plate 2 is wound around a vertical cylinder 1, which is rotatably attached to the vertical cylinder 1. When material A is supplied, the granulated material slides against the inner wall of the cylinder 1 and rolls down the surface of the rotating spiral vane plate 2, forming spherical aggregates and being continuously discharged from the bottom of the cylinder. do.

When these aggregates dry, the acrylic acid ester liquid adhesive in the emulsion state exhibits adhesive strength, forming a spherical sized soil mass B in which the soil particles adhere to each other.
become.

The sized soil lump B is agglomerated with a coating of acrylic acid ester liquid adhesive on the surface of the soil particles, so it has more elasticity than asphalt or concrete, and moreover, its single particles have a coating of liquid acrylic ester adhesive. Because they are glued together, when the liquid adhesive dries, it maintains its spherical aggregate state well. Furthermore, acrylic ester has better weather resistance than rubber latex and does not lose its elasticity over a long period of time.

In order to use this sized soil block B for school grounds and streets, it is necessary to use a binder with strong caking force and high stability, such as a binder made by adding a thickener to liquid acrylic ester and making it into a starch syrup-like form. By spreading a mixture of soil clods B on the ground and paving the surface by compressing it with rollers, each sized soil clod B is connected, and a group of sized soil clods C, which looks like a confectionery cake, is formed.
The finishing touches are as follows.

At this time, the grain size of the sized soil clod B laid on the surface layer is made small, for example, 3 to 5 mm to suppress surface irregularities, and the grain size of the sized soil clod B in the lower layer is set to 8 to 15 mm.

(Effects of the Invention) Since the method for producing the sized soil lump B according to the present invention uses volcanic ash clay or clay as the main material, the sized soil lump B of the invention, such as a school ground or a street, can be used as the main material. Not only can the main material be easily obtained at sites where B is required, but a thin film of an acrylic ester liquid adhesive can be applied to single particles, that is, soil particles, with a particle size of 0.5 mm or less. Since the soil particles are glued together and aggregated into soil clods with a particle size of 2 mm or more, the soil particles maintain their spherical aggregate state and do not collapse unnecessarily due to rainwater or freezing and thawing, and even when the wind blows, the particle size remains 2 mm or more. Since it is large (more than a millimeter), it has the effect of not scattering. Furthermore, the sized soil blocks B can be continuously produced in large quantities by the spiral blades rotating within the vertical cylinder.

Since the sized soil mass B produced according to the present invention has appropriate water retention and drainage properties, it can also be used as culture soil for hydroponic cultivation. Further, according to the present invention, clayey soil that is difficult to handle can be improved into a sized soil mass B that is free-flowing like gravel, so it can be effectively used as a good backfilling soil.

Furthermore, when using the paving method using the sized soil blocks of the present invention, the sized soil blocks B constituting the sized soil blocks B are spherical and bonded by dry acrylic ester, and have elasticity, so that the surface thereof has a moderate amount of friction. It has good slip resistance, so there is no risk of fractures due to excessive force being applied to the legs during exercise, and there is no risk of a child getting abrasions even if they fall, making it safe.
Furthermore, it has excellent weather resistance, making it ideal for creating grounds for schools and the like. In addition, the spherical sized soil mass B, which is made up of soil particles coated with dried acrylic ester, retains rainwater well between each soil particle, and because the distance between each granulated soil mass is large, rainwater permeates downward as appropriate. This prevents puddles from forming on the ground and allows street trees to grow at the same time. Moreover, it is weather resistant and water resistant, so when applying the paving method of the present invention on top of ground that is difficult to permeate, rainwater can be temporarily stored underground to prevent flooding of small and medium-sized rivers in cities due to heavy rain. .

In addition, when using the paving method according to the present invention, each sized soil mass B becomes the same body and restrains each other, so it does not scatter even when an external force is applied, and the stress is widely dispersed, so that even if you move on this soil, it will not scatter. The pavement will not be damaged or punctured by impact, resulting in a durable effect.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing the manufacturing process of a sized soil lump according to the present invention, and FIG. 2 is a perspective view showing a longitudinal section of an outer cylinder of a granulator equipped with a rotary disk used in the present invention. A is a granulated material, B is a granulated soil mass, C is a granulated soil mass group,
1 is a cylinder, 2 is a spiral blade, and 3 is a vertical axis.

Claims (1)

[Claims] 1. Cohesive soil is used as the main material, acrylic ester liquid adhesive is added thereto, and the mixture is pulverized, mixed, and stirred using a roller mixer while adjusting the water content within the plastic range.
A thin film of the above-mentioned liquid adhesive is attached around the soil particles to form agglomerated mixed soil, which is then pumped through an outer cylinder equipped with a perforated plate with a hole diameter of 2 to 30 mm at the tip to form short cylindrical granules. The granules are shaped into spherical aggregates by rolling on a spiral vane rotating in a vertical cylinder.
A method for producing sized soil lumps characterized by continuous discharge from the bottom of a vertical cylinder. 2. Using clay as the main material, add an acrylic acid ester liquid adhesive to it, adjust the water content to a plasticity range, and crush and mix with a roller mixer.
A thin film of the above-mentioned liquid adhesive is attached around the soil particles to form agglomerated mixed soil, which is then pumped through an outer cylinder equipped with a perforated plate with a hole diameter of 2 to 30 mm at the tip to form short cylindrical granules. The granules are shaped into spherical aggregates by rolling on a spiral vane rotating in a vertical cylinder.
The sized soil lumps that are continuously discharged from the bottom of a vertical cylinder are collected, and the sized soil lumps are combined with a binder that has a strong cohesive force and high stability, such as a syrup-like mixture made by adding a thickener to liquid acrylic ester. A paving method using sized soil lumps, which is characterized by mixing, adhering the sized soil lumps to each other, spreading the same on the ground, rolling the surface with rollers, and joining each sized soil lump.