JP4833670B2 - Method for producing plant growth base material using soil containing gravel - Google Patents

Description

  The present invention relates to a method for producing a plant growth base material using soil containing gravel for greening a slope or flat face (hereinafter referred to as “slope, etc.”) formed by cutting, embankment or the like.

  In construction work such as road construction and residential land development, excavation of ground including topsoil will be carried out following logging and excavation of forests. The excavated soil is reused as a plant growth base material for greening the slope. Thereby, the amount of soil disposed without being reused can be reduced. Moreover, since the topsoil contains a large amount of seeds and fertilizers, it is possible to promote the greening of the slope.

  The plant growth base material is produced by stirring and mixing soil and other materials such as agglomerates, binders, fertilizers, plant fragments, seeds, water, etc., and sprayed on the slopes, etc. Is done. By mixing the soil, the water, and the aggregate agent, clay particles contained in the soil are aggregated to form an aggregate structure. Thereby, the said plant growth base material can be given water retention and fertilization property.

The soil generated by the construction work includes gravel. In a conventional method for producing plant growth base materials using gravel-containing soil, the gravel is separated and removed from the soil using a sieve, and the soil from which the gravel has been removed and the other materials are stirred. (For example, refer to Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 11-21900 Japanese Patent Laid-Open No. 2002-167663

  By the way, since the said soil generally contains many clay particles and has viscosity, it has hardened in the state containing the said gravel. For this reason, in the conventional manufacturing method, the sieving of the soil is not sufficiently performed, and a part of the soil remains on the sieve. Therefore, it is difficult to efficiently utilize clay particles that are effective components for the production of the plant growth base material. Therefore, when the eyes of the sieve are made larger so that the soil does not remain on the sieve, the gravel passes through the sieve, and the gravel cannot be sufficiently removed from the soil. For this reason, there arises a problem that the blades of the mixer are damaged by the gravel at the time of stirring, or the gravel falls from the slope after spraying, resulting in danger.

  An object of the present invention is to make it possible to efficiently use clay particles contained in the soil for the production of the plant growth base material. Another object of the present invention is to remove the gravel from the soil in advance to prevent the gravel from being damaged by the gravel during agitation or falling from the slope after spraying. That is.

  The present invention is characterized in that a mixture of soil and water from which gravel has been removed is generated prior to generation of a mixture containing at least soil, water, and aggregating agent.

The first method for producing a plant growth base material using gravel-containing soil according to the present invention includes a first step of preparing about 300 liters to about 600 liters of water per 1 m ³ of the plant growth base material, A second step of separating and removing the gravel from the soil using all of the water and a sieve to produce a mixture of soil and water from which the gravel has been removed, and at least a mixture and group of the soil and water; A third step of mixing the granules. By sifting the soil with the water, the gravel can be separated and removed from the soil relatively easily, thereby producing a mixture of soil and water from which the gravel has been removed. Can do. Further, by sifting the soil using the water, the soil from which the gravel has been removed can be washed away from the sieve, and thereby the clay particles contained in the soil can be removed from the mixture of the soil and water. It can be used efficiently for generation.

The second method for producing a plant growth base material using gravel-containing soil according to the present invention includes the first step of preparing about 300 liters to about 600 liters of water per 1 m ³ of the plant growth base material, Separating and removing the gravel from the soil using a portion of water and a sieve to produce a mixture of soil and water from which the gravel has been removed, and at least a mixture of the soil and water; A third step of mixing the aggregate and the other part of the water.

  In the first and second manufacturing methods, the second step can be performed by sieving the soil while adding the water to the soil outside the mixing tank. In this case, the water may be sprayed onto the soil placed in the sieve function-equipped bucket, or the water may be sprayed onto the soil placed on a plate-shaped sieve. The second step can also be performed by sieving the soil in the water.

  In the first manufacturing method, in the third step, in addition to the mixture of soil and water and the aggregate agent, at least one of a plant fragment, a bonding agent, a fertilizer, and a seed can be mixed. . In the second production method, the third step includes at least a mixture of the soil and water, the aggregate, and the other part of the water, as well as a plant fragment, a bonding agent, a fertilizer, and a seed. One can be mixed.

  According to the present invention, prior to the generation of the mixture containing at least soil, water, and the aggregate agent, the mixer blades are damaged by the gravel during agitation by generating a mixture of soil and water from which the gravel has been removed. Or the gravel can be prevented from falling from the slope after spraying. Moreover, the clay particles contained in the soil can be efficiently used for the production of the plant growth base material.

  As shown in FIG. 1, soil 10, water 12 and aggregate 14 containing gravel are prepared in a construction site such as road construction and residential land development. The soil 10 is soil generated at the site or introduced from another site. A sieving bucket 16 having a grid-like bottom (not shown) for sieving the soil 10 is attached to an excavating and transporting machine 18 such as a backhoe.

  A mixer 20 such as a biaxial forced kneading mixer that performs stirring to produce a mixture containing at least soil, water, and agglomerate 14 is installed on a setting table 22. The mixer 20 includes a mixing tank 24 and stirring blades 26 provided in the mixing tank. A water supply tank 28 containing water 12, a water metering tank 30 that adjusts the amount of water 12, and a water ejection device 32 that injects the water 12 onto the soil 10 are installed on the installation table 22. A pump for connecting water between the water supply tank 28 and the water metering tank 30 and between the water metering tank 30 and the water jetting device 32 with a water supply pipe 34 to send water to each of the water supply tank 28 and the water metering tank 30. 36 is installed. The water ejection device 32 is fixed at a position higher than the mixing tank 24.

When the plant growth base material is manufactured, as shown in FIG. 2, first, the amount of water 12 is adjusted to prepare about 300 liters to about 600 liters of water 38 per 1 m ³ of the plant growth base material. . The water amount is adjusted by supplying the water 12 from the water supply tank 28 to the water metering tank 30 with the pump 36 and measuring the water amount in the water metering tank 30.

The amount of water 38 to be prepared can be changed according to the proportion of clay particles in the soil 10. The amount of water 38 prepared to produce 1 m ^{3 of the} plant growth base material is about 300 liters when the ratio is about 10% to about 20%, as when the soil 10 contains a lot of sand. When the ratio is about 30% to about 50%, such as when 10 is a general forest topsoil, about 400 liters, and when the ratio is about 50% to about 60%, about 500 liters to About 600 liters is preferred. The amount of the water 38 is not limited to the above example, and can be changed according to other components of the soil 10 or the water content ratio, the amount of the aggregate 14 used, and the like.

  Next, the soil 10 is scooped by the bucket 16 with a sieve function, and the bucket 16 with a sieve function is moved onto the mixing tank 24 of the mixer 20. Thereafter, the water 38 is sent from the water metering tank 30 to the water jetting device 32 through the water pipe 34 by the pump 36, and the soil 10 is sieved while being jetted from the water jetting device to the soil 10 in the bucket 16 with a sieve function. Thereby, the gravel is separated and removed from the soil 10, and a mixture of the soil and water from which the gravel has been removed is generated in the mixing tank 24.

A 50 mm diameter hose can be used for the water supply pipe 34, and a 25 mm diameter nozzle attached to the tip of the hose can be used for the water ejection device 32. When the proportion of clay particles in the soil 10 is about 30% to about 50%, about 0.25 m ³ of the soil 10 can be screened in about 1 minute using about 150 liters of water 38. Therefore, when producing the plant growth base material 1m ³ using about 0.5m ³ soil 10 and other materials such as about 0.5m ³ plant fragment, The amount of water required is about 300 liters. The amount of water and time required for sieving the soil 10 can be appropriately set by adjusting the pressure of the water 38 sprayed onto the soil 10.

  The soil 10 is screened using all or part of the water 38. When the amount of water required for sieving the soil 10 is relatively large, the water pressure of the water 38 ejected from the water ejection device 32 can be increased in order to keep the amount of water within the range of the amount of water 38. By using water 38 for sieving the soil 10, the gravel can be separated from the soil 10 and removed relatively easily. In addition, since the soil from which the gravel has been removed can be washed away with water 38 without leaving the inside of the bucket 16 with a sieving function, the clay particles contained in the soil 10 are efficiently used for generating a mixture of the soil and water. be able to.

  For sieving the soil 10, instead of the sieve function bucket 16 having a lattice bottom (not shown), a sieve function bucket (not shown) having a cylindrical sieve that can be rotated around an axis. Other buckets with a sieve function may be used. In the case of using a bucket with a sieve function having the cylindrical sieve, the soil 10 is put into the cylindrical sieve, and the cylindrical sieve is rotated while spraying water 38 to the soil, and the earth 10 is sieved.

  Further, the sieving of the soil 10 can be performed using a plate-like sieve 40 as shown in FIG. 3 instead of the bucket with a sieve function. In this case, first, the sieve 40 is installed on the mixing tank 24, and the soil 10 is placed on the sieve 40 by an excavating and transporting machine (not shown) such as a backhoe. Thereafter, the water 10 is sprayed onto the soil 10 to screen the soil 10. Thereby, the mixture 42 of the soil and water from which the gravel has been removed is generated in the mixing tank 24.

  The sieving of the soil 10 can be performed by a method performed in the water 38 in addition to the above method performed while adding the water 38 to the soil 10 outside the mixing tank 24. In the example shown in FIG. 4, first, a water tank 44 is prepared separately from the mixing tank 24 of the mixer 20, and water 38 is put into the water tank 44. Next, the soil 10 is scooped by the bucket 16 with a sieve function, the bucket 16 with a sieve function is put in the water tank 44, and the soil 10 is sieved in the water 38. Thereby, the gravel is separated from the soil 10. Then, the gravel is removed by taking out the bucket 16 with a sieving function from the water tank 44, and a mixture of soil and water from which the gravel has been removed is generated in the water tank 44. Thereafter, the mixture of the soil and water is put into the mixing tank 24 of the mixer 20. The sieving of the soil 10 may be performed in the mixing tank 24 of the mixer 20 without using the water tank 44.

  In the example shown in FIG. 5, the soil 10 is sieved using a plate-like sieve 46 instead of the sieve function-equipped bucket 16. In this case, first, a plate-like sieve 46 is attached in the mixing tank 24, and water 38 is put into the mixing tank 24 to a position higher than the position where the sieve 46 is attached. Next, the soil 10 is placed on the sieve 46 by the excavating and transporting machine (not shown), and the soil 10 is sieved in the water 38. Thereby, the gravel is separated from the soil 10. Thereafter, the sieve 46 from which the gravel is left is taken out of the mixing tank 24, and a mixture of soil and water from which the gravel has been removed is generated in the mixing tank 24.

  Thereafter, the aggregate 14 is placed in the mixing tank 24. A polymer flocculant such as polyacrylamide is used for the aggregate 14. When all of the water 38 is used to form the soil and water mixture, the soil and water mixture and the aggregate 14 are agitated and mixed with the blades 26 of the mixer 20 in the mixing tank 24. Then, the plant growth base material 48 is generated (FIG. 2). By mixing the mixture of soil and water and the aggregate agent 14, clay particles contained in the soil are aggregated to form an aggregate structure. When the plant growth base material 48 has the aggregate structure, the plant growth base material 48 can have water retention and fertilization properties, and greening of the slope can be promoted.

  When mixing the soil and water mixture and the aggregate 14, in addition to the soil and water mixture and the aggregate 14, at least one of plant fragments, cement, fertilizer and seeds is mixed. be able to. The crushed pieces of the plant include tree roots, trunks, branches and leaves, etc. generated by cutting down the forest. The plant growth base material 48 can be reinforced by the intertwined pieces of the plant. By using the plant fragments for generating the plant growth base material 48, the amount of plant fragments discarded without being reused can be reduced.

On the other hand, when a part of the water 38 is used to form the mixture of the soil and water, the other part of the water 38 in addition to the aggregate 14 is put in the mixing tank 24, and the soil and water are mixed. , The granule 14 and other part of the water 38 are mixed by mixing with the blades 26 of the mixer 20 in the mixing tank 24 to produce a plant growth base material 48 (FIG. 6). In addition, when the water 38 is about 300 liters per 1 m ³ of the plant growth base material and a part of the water 38 is about 200 liters, the other part of the water 38 is about 100 liters. When the water 38 is about 400 liters per 1 m ³ of the plant growth base material and a part of the water 38 is about 300 liters, the other part of the water 38 is about 100 liters. When the water 38 is about 600 liters per 1 m ³ of the plant growth base material and a part of the water 38 is about 450 liters, the other part of the water 38 is about 150 liters.

  When mixing the soil and water mixture, the aggregate 14 and the other part of the water 38, in addition to the soil and water mixture, the aggregate 14 and the other part of the water 38, At least one of crushed pieces, binder, fertilizer and seeds can be mixed.

  Thereafter, the plant growth base material 48 is mounted on the truck 50 and transported, and is spread on the slope.

  According to the present invention, prior to the production of a mixture containing at least soil, water and aggregate 14, the mixer blades are damaged by the gravel during agitation by producing a mixture of soil and water from which the gravel has been removed. Or the gravel can be prevented from falling from the slope after spraying. Further, by sieving the soil 10 using the water 38, the clay particles contained in the soil 10 can be efficiently used for generating the plant growth base material 48.

The equipment layout in the 1st example of the manufacturing method of the plant growth base material concerning the present invention. The work procedure of the manufacturing method of the plant growth base material which concerns on this invention. The equipment layout in the 2nd example of the manufacturing method of the plant growth base material concerning the present invention. The equipment layout in the 3rd example of the manufacturing method of the plant growth base material concerning the present invention. The equipment layout in the 4th example of the manufacturing method of the plant growth base material concerning the present invention. The work procedure of the other manufacturing method of the plant growth base material which concerns on this invention.

Explanation of symbols

10 Soil 12, 38 Water 14 Aggregate 16 Bucket with sieve function 24 Mixing tank 44 Water tank 40, 46 Plate-shaped sieve 48 Plant growth base material

Claims (8)

A method for producing a plant growth base material using soil containing gravel, the first step of preparing about 300 liters to about 600 liters of water per 1 m ³ of the plant growth base material; Separating and removing the gravel from the soil using a second step to produce a mixture of soil and water from which the gravel has been removed, and mixing at least the soil and water mixture and the aggregate. A method for producing a plant growth base material, comprising 3 steps. A method for producing a plant growth base material using soil containing gravel, the first step of preparing about 300 liters to about 600 liters of water per 1 m ³ of the plant growth base material, and a part of the water and sieving A second step of separating and removing the gravel from the soil using the method to produce a mixture of soil and water from which the gravel has been removed, at least a mixture of the soil and water, an aggregate, and the water And a third step of mixing the other part of the plant.   The method for producing a plant growth base material according to claim 1 or 2, wherein the second step includes sieving the soil while adding the water to the soil outside a mixing tank.   The said 2nd step is a manufacturing method of the plant growth base material of Claim 1 or 2 including sifting the said soil in the said water.   The said 2nd step is a manufacturing method of the plant growth base material of Claim 3 including spraying the said water to the said soil put into the bucket with a sieve function.   The said 2nd step is a manufacturing method of the plant growth base material of Claim 3 including spraying the said water on the said soil put on the plate-shaped sieve.   The plant according to claim 1, wherein the third step includes mixing at least one of a plant fragment, a bonding agent, a fertilizer, and a seed in addition to the mixture of soil and water and the aggregate. Manufacturing method of growth base material.   The third step includes mixing at least one of a plant fragment, a bonding agent, a fertilizer, and a seed in addition to the mixture of soil and water, the aggregate, and the other part of the water. The manufacturing method of the plant growth base material of Claim 2.

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