Soil improvement method of ground

Abstract

To provide a ground reform method capable of improving deteriorated ground conditions through improvement of a soil property itself.SOLUTION: A soil improvement method of a ground according to the present invention comprises: a plowing process for plowing present surface soil of the ground by a bulldozer; a sieving process for sieving and refining the present surface soil plowed by a self-traveling plowing machine; a water-retention agent mixing process for acquiring water-retention processed soil by mixing a water-retention agent and the present surface soil; a sand mixing process for soil improvement acquiring improved soil by mixing a sand for soil improvement with the water-retention soil; an installing and leveling process for installing and leveling the improved soil on the ground; a stabilizing process for dispersing a stabilization agent on a surface of the deployed and leveled improved soil; an agitation process for agitating a surface layer of the ground; a finishing process for leveling and flattening using a land planer; and a final finishing process for leveling the ground with the ground mat for final finish.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a method for improving the soil of baseball grounds, tennis courts, parks, etc.

Background Art

[0002] In grounds such as baseball grounds, soccer grounds, tennis courts, softball grounds, and parks, due to aging changes such as use and rainfall, the condition of the ground deteriorates. Specifically, problems with drainage occur, such as the deterioration of the water gradient of the ground, the occurrence of water pooling and mud after rainfall, and the hardening due to bitter juice and lime, the overgrowth of weeds, and the formation of surface irregularities.

[0003] The inventor has proposed a ground surface drainage method in Patent Document 1, in which a grid-shaped underground drainage channel is formed on the surface layer of the ground and filled with crushed stones or the like to improve the drainage efficiency.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Disclosure of the Invention

Problems to be Solved by the Invention

[0005] There is a need for a method for improving a ground with poor conditions by improving the quality of the soil itself rather than structurally improving the ground.

[0006] An object of the present invention is to provide a ground reform method that can improve the condition of a deteriorated ground by improving the quality of the soil itself.

Means for Solving the Problems

[0007] The method for improving the soil quality of the ground according to the present invention is A bulldozer that is placed on the ground and receives the laser light from a rotating laser device that emits laser light and travels while receiving GPS removes the surface soil of the current ground condition in a scraping process; In a sieving process, the surface soil of the current condition that has been scraped is sieved and refined by a self-propelled sieve machine; In a water retention effect material mixing process, a water retention effect material composed of magnesium oxide: 40% - 60%, calcium oxide: 15% - 35%, and inevitable impurities in mass% is mixed with the surface soil of the current condition to obtain water retention treated soil; In a sand for soil improvement mixing process for soil improvement, sand for soil improvement with a particle size distribution having a peak of 20 mesh - 40 mesh, composed of silicon dioxide: 95% - 98%, aluminum oxide: 1% - 2%, and the balance iron(III) oxide, potassium oxide, sodium oxide, and inevitable impurities in mass%, is carried into the ground and mixed with the water retention treated soil to obtain improved soil; In a leveling process, the improved soil is leveled on the ground; In a stabilization process, a stabilizer composed of calcium chloride: 40% - 60%, magnesium chloride: 40% - 60%, and the balance inevitable impurities in mass% is sprayed on the surface of the leveled improved soil; In a stirring process, the surface layer of the ground is stirred by a tractor equipped with a Taylor attachment; In a finishing process, a kannakutter with steel materials assembled into a frame shape is towed by a tractor, and the ground is leveled and made flat with the kannakutter; In a final finishing process, a ground mat is towed by a tractor, and the ground is leveled with the ground mat for final finishing; It has.

[0008] The sand for soil improvement mixing process can be carried out before the water retention effect material mixing process.

[0009] The kannakutter can be formed by projecting a flat blade member downward from the lower edge of the steel materials assembled into a frame shape.

[0010] The can cutter can be towed with a weight placed on the rear side.

[0011] The stirring process can stir the 1 cm to 8 cm surface layer of the ground.

[0012] The stabilization process is arranged behind the tractor, and the stabilizer can be put into a hopper with a wide discharge port in the width direction and sprayed onto the ground.

Advantages of the Invention

[0013] According to the ground soil quality improvement method according to the present invention, the quality of the soil of the ground with deteriorated conditions can be improved and revived.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Modes for Carrying Out the Invention

[0015] Hereinafter, the soil improvement method for the ground 10 according to the present invention will be described with reference to the drawings.

[0016] FIG. 1 is a photograph of the ground 10 before soil improvement. The ground 10 before soil improvement has unevenness on the surface, and due to aging deterioration caused by use and rainfall, problems such as drainage problems such as deterioration of the water gradient, generation of water puddles and softness after rainfall, and deterioration of the condition such as hardening by bitter juice and lime and overgrowth of weeds.

[0017] The soil improvement method for the ground 10 with the deteriorated condition as described above can be composed of a plowing step, a sieving step of the current surface soil, a water retention effect material mixing step, a sand mixing step for soil improvement, a stabilization step, a stirring step, a finishing step, and a final finishing step. Hereinafter, each step will be described in detail.

[0018] <Plowing Step> The plowing step is a step of plowing the unevenness and overgrown weeds of the ground 10 from the current surface soil prior to soil improvement of the ground 10. The plowing step can be performed using a bulldozer 20 as shown in FIG. 2.

[0019] In the plowing step, it is desirable to correct the gradient of the ground 10 at the same time. In this case, prior to the plowing step, the survey data of the ground 10 is measured in advance.

[0020] In the plowing step, by introducing i construction, correct plowing can be performed over the entire surface of the ground 10, and accurate gradient correction can also be performed. Specifically, it is desirable to use a bulldozer 20 that operates using laser light and / or GPS (Global Positioning System). The bulldozer 20 has a function of receiving laser light and / or a function of receiving GPS from the satellite 25, and a rotating laser device 24 is arranged at one or more locations on the ground 10, and the bulldozer 20 travels by receiving laser light and / or GPS.

[0021] It is preferable to adopt rubber crawlers 21 for the bulldozer 20. This can reduce the contact pressure on the ground 10 and prevent the topsoil from being compacted during the soil scraping process.

[0022] By driving the bulldozer 20 on the ground 10 based on laser light and / or GPS, the topsoil of the ground 10 can be scraped off by the blade 22, and the gradient of the ground 10 can also be corrected.

[0023] <Sieving process> After the soil scraping process, a sieving process is carried out to sieve and purify the scraped topsoil. As shown in Figure 3, the sieving process can be effectively performed by adopting an excavator 30 and a self-propelled sieve machine 31. The self-propelled sieve machine 31 can travel on the ground 10 by crawlers and has the function of crushing the current topsoil 12 dug up by the excavator 30 and sieving it to a predetermined coarseness. The sieve machine 31 has a sieve 32 on the rear side and a conveyor 33 on the front side. The soil 12 fed from the excavator 30 is sieved by the sieve 32, sent forward from the conveyor 33, and returned to the ground 10.

[0024] It is preferable that the sieve 32 of the sieve machine 31 has an aperture of about 5 mm to 40 mm.

[0025] By driving the excavator 30 and the self-propelled sieve machine 31 on the ground 10 and performing the sieving process on all the topsoil 12 of the ground 10, large lumps of the current topsoil 12 can be crushed, and sieved soil 13 from which stones and foreign matters that cannot pass through the sieve 32 are removed can be obtained.

[0026] <Water retention effect material mixing process> Subsequently, a water retention effect material is mixed into the sieved soil 13. The water retention effect material can be configured to include magnesium oxide and calcium oxide, which are alkaline materials. The water retention treated soil obtained by mixing the water retention effect material and the current surface soil undergoes a hydration reaction with moisture and inorganic components in the soil, causing the cohesive silt soil in the soil to aggregate and granulate. The water retention treated soil has a water-resistant granule structure, a high coarse porosity, excellent water permeability, and good drainage. In addition, the water retention treated soil is less likely to cause frost heaving, mud formation during thawing, and surface damage during winter due to the aggregation effect. Moreover, the water retention treated soil can alleviate summer drought and the generation of dust such as soil dust, providing a comfortable ground condition throughout the year.

[0027] The water retention effect material can be composed of, for example, magnesium oxide: 40% - 60%, calcium oxide: 15% - 35%, and inevitable impurities by mass percentage. Desirably, the proportion of magnesium oxide is 45% - 55%, and the proportion of calcium oxide is 20% - 30%.

[0028] The water retention effect material is adjusted so that the specific surface area (Blaine value) of the powder is 5000 - 7000 cm 2 / g, which is effective for mixing with cohesive silt soil, their aggregation, and granulation, and is also suitable for spraying. The specific surface area (Blaine value) of the powder is more desirably 6000 - 6500 cm 2 / g.

[0029] The water retention effect material is carried into the ground 10 and mixed with the sieved soil 13 by, for example, the self-propelled mixer 35 shown in FIG. 4. The self-propelled mixer 35 can move by itself with crawlers, has a packet 36 for storing the water retention effect material on the rear side, and the sieved soil 13 is input from the shovel car 30. The water retention effect material and the sieved soil 13 are mixed while passing through the mixing section 37 containing the spiral screw to obtain the water retention treated soil 14. The amount of the water retention effect material mixed into the sieved soil 13 can be adjusted by computer control, and the mixing ratio can be freely set, for example, in 1% increments. The water retention effect material is 1 m 2It is preferable to mix 10 kg to 50 kg per hit, and more preferably 15 kg to 45 kg. The water retention treatment soil 14 is sent from the conveyor 38 provided at the tip of the mixer 35 and returned to the ground 10.

[0030] <Soil improvement sand mixing process> Further, soil improvement sand is mixed into the water retention treatment soil 14. The soil improvement sand is an improver that weakens the clay content of the soil and makes it difficult to retain water, and has the effect of adjusting the water retention property of the water retention treatment soil whose water retention property is enhanced by the water retention effect material. The soil improvement sand preferably consists of silicon dioxide: 95% to 98%, aluminum oxide: 1% to 2%, and the balance being iron(III) oxide, potassium oxide, sodium oxide, and unavoidable impurities by mass%. Also, the soil improvement sand preferably has a peak in the particle size distribution of 20 mesh to 40 mesh.

[0031] The soil improvement sand can be carried into the ground 10 and mixed with the water retention treatment soil 14a by, for example, the self-propelled mixer 35 shown in FIG. 4 in the same manner as in the above-described water retention effect material mixing process. The self-propelled mixer 35 accommodates the soil improvement sand in the packet 36, and the water retention treatment soil is input from the shovel car 30 and the soil improvement sand and the water retention treatment soil 14a are mixed in the mixing section 37. The amount of the soil improvement sand mixed into the water retention treatment soil 14a may be adjusted by computer control. Although it also depends on the hardness of the ground 10 at the time of completion, etc., it is preferable to mix 5% to 40% of the soil improvement sand per unit volume, and more preferably 10% to 30%. The improved soil 15 in which the soil improvement sand is mixed by the mixing section 37 is sent from the conveyor 38 provided at the tip of the mixer 35 and returned to the ground 10.

[0032] Note that in the water retention effect material mixing process and the soil improvement sand mixing process, the soil improvement sand mixing process may be carried out first. Also, both the water retention effect material and the soil improvement sand may be accommodated in the packet 36 of the self-propelled mixer 35 and these may be mixed into the soil at the same time.

[0033] <Leveling process> Thereafter, once, a leveling step of leveling the soil filled with the improved soil 15 (see FIG. 4) is interposed by the above-mentioned bulldozer 20 (FIG. 2) or the like. As a result, the improved soil 15 is evenly spread on the ground 10.

[0034] <Stabilization step> Subsequently, the stabilizer 16 is sprayed on the surface of the ground 10 where the improved soil 15 is evenly spread. The stabilizer 16 can be a granular material composed of calcium chloride: 40% - 60%, magnesium chloride: 40% - 60%, and the balance inevitable impurities in terms of mass%. The stabilizer 16 is sprayed to achieve the dust-proof effect of the soil. Also, by spraying the stabilizer 16 on the improved soil 15 after granulation and performing the stirring in the next step, the dust-proofing of the silt in the improved soil 15 can be achieved and the clay content can be incorporated. In addition, since the stabilizer 16 has the function of absorbing the moisture in the air, the soil can be made difficult to dry.

[0035] As shown in FIG. 5, the stabilizer can be sprayed by a hopper 41 attached to the tractor 40. In FIG. 5, a hopper 41 with a wide discharge port in the width direction is attached to the rear of the tractor 40, the stabilizer 16 is put into the hopper 41, and the tractor 40 is made to run on the ground 10.

[0036] <Stirring step> The ground where the stabilizer 16 is sprayed is cultivated before the finishing step to stir and mix the stabilizer 16 with the improved soil 15 on the surface layer of the ground 10. The stirring can be carried out by a tractor 40 equipped with a Taylor attachment 50 as shown in FIG. 6(a). As shown in part in FIG. 6(b), the Taylor attachment 50 can adopt a structure in which a plurality of cultivating claws 51 are attached to a rotating shaft 52. The illustrated cultivating claw 51 is a so-called nata claw.

[0037] With the tractor 40 equipped with the Taylor attachment 50, the ground 10 can be stirred, mixed, and softened to a surface layer, preferably with a thickness of 1 cm to 8 cm, desirably 3 cm to 5 cm. And by this stirring, the stabilizer is mixed with the improved soil, and the improvement of the soil quality is completed. The effects of the improved ground will be described later.

[0038] <Finishing process> Finally, the finishing of the ground 10 is carried out. The finishing process is mainly the unevenness correction for correcting the unevenness and height differences on the surface of the ground 10. As shown in Fig. 7(a), the finishing process can be implemented by towing the kannakutter 60, in which the steel material 62 is assembled into a rectangular frame shape, with the tractor 40. As shown in Fig. 7(b), the kannakutter 60 can be equipped with U-shaped angles 67 on the left and right sides of one side of the rectangular frame 61, and the wire 68 can be hung on the angle 67 and towed with the tractor 40. Note that a wire can also be hung at the corner of the rectangle. In order to prevent the kannakutter 60 from floating, it is desirable to place the weight 69 on the rear side.

[0039] Fig. 7(c) is a cross-sectional view of the kannakutter 60. The kannakutter 60 can be configured such that, for example, an equilateral mountain-shaped (L-shaped) steel material 62 is arranged in an inverted L shape, assembled into a rectangular frame shape with the vertical member on the outer peripheral side, and the flat blade member 63 is bolted 64 to the outer peripheral side of the vertical portion of the steel material 62. By adopting high-tensile steel (high-tension steel) for the blade member 63, wear can be reduced. Also, by bolt-fastening 64 the blade member 63, it is easy to replace the blade member 63 when it wears. Note that it is preferable to reinforce by applying build-up welding 65 to the bent portion so that the L-shaped steel material 62 does not open. Also, it is desirable to attach a reinforcing plate 66 or the like to the corner where the steel materials 62 intersect.

[0040] By towing the cannabis cutter 60 with the above configuration using the tractor 40, the unevenness and height differences on the surface of the ground 10 can be corrected, and the soil in the high part can be moved to the low part and leveled. In the case of the cannabis cutter 60 in Fig. 7(c), the blade member 63 on the front side of the rectangular frame type can cut the soil, and it can be leveled with the blade member 63 on the rear side, and the unevenness correction can be preferably performed.

[0041] <Final finishing process> After the finishing process, as shown in Fig. 8, the ground mat 70 is towed with the tractor 40 to level the minute unevenness of the ground 10 remaining in the finishing process and correct the unevenness. The ground mat 70 can be made of a mesh-shaped metal. Further, a brush or a rake may be attached to the ground mat 70.

[0042] By towing the ground mat 70 with the above configuration using the tractor 40, the unevenness of the ground 10 is leveled and the unevenness is corrected, and it can be finally finished flat (Fig. 9).

[0043] After that, as shown in Fig. 9, line drawing or the like may be performed on the ground 10 as necessary.

[0044] The soil quality of the ground 10 improved according to the present invention has the effect of aggregating and granulating the viscous silt soil in the surface soil by the water retention effect material. The water retention treated soil has a water-resistant granule structure, a high coarse pore rate, excellent water permeability, and good water drainage. In addition, the water retention treated soil is less likely to cause frost heaving, muddying during thawing, and surface damage during winter due to the aggregation effect. In addition, the water retention treated soil can alleviate the drying in summer and the generation of dust such as soil dust, and can provide a comfortable ground condition throughout the year. Furthermore, the hardness at the time of finishing can be adjusted by the soil improvement sand, and for example, characteristics such as clay paving can be obtained. In addition, when the drainage is poor, it is desirable to appropriately form an underdrain or the like in the roadbed below the surface soil. In addition, the stabilizer 16 can exhibit a dust-proof effect on the soil and make the soil less likely to dry by sucking in the moisture in the atmosphere.

[0045] Figure 9 is a photograph of the ground 10 after the final finishing process. As shown in the figure, the ground 10 can be revived into a beautiful ground 10 with the deteriorated condition improved and looking almost unrecognizable.

[0046] The description of the above embodiments is for explaining the present invention and should not be construed as limiting the invention described in the claims or reducing the scope. Also, each component of the present invention is not limited to the above embodiments, and it goes without saying that various modifications are possible within the technical scope described in the claims.

[0047] It should be understood that the devices used in each process are examples. Also, the dimensions and shapes are examples and do not limit the present invention. Also, the ground 10 may be a baseball ground, a soccer ground, a tennis court, a softball ground, etc.

[0048] Also, between each process, a process of leveling the surface of the ground 10 with the bulldozer 20 shown in FIG. 2 as appropriate and a process of rolling with a roller can be inserted.

Explanation of Signs

[0049] 10 Ground 20 Bulldozer 30 Shovel car 31 Self-propelled sieve machine 35 Self-propelled mixer 40 Tractor 50 Taylor attachment 60 Canna cutter 70 Ground mat

Claims

1. A ground soil improvement method, comprising: a scraping step of scraping the current surface soil of the ground by a bulldozer that receives the laser light from a rotating laser device disposed on the ground and emits the laser light and travels while receiving GPS; a sieving step of sieving and purifying the scraped current surface soil by a self-propelled sieve; a water retention effect material mixing step of mixing a water retention effect material composed of magnesium oxide: 40% to 60%, calcium oxide: 15% to 35%, and inevitable impurities in mass% with the current surface soil to obtain water retention treated soil; a soil improvement sand mixing step of carrying into the ground a soil improvement sand composed of silicon dioxide: 95% to 98%, aluminum oxide: 1% to 2%, and the balance being iron (III) oxide, potassium oxide, sodium oxide and inevitable impurities, having a peak in the particle size distribution of 20 mesh to 40 mesh, and mixing with the water retention treated soil to obtain improved soil; a leveling step of leveling the improved soil on the ground; a stabilizing step of spraying a stabilizer composed of calcium chloride: 40% to 60%, magnesium chloride: 40% to 60%, and the balance being inevitable impurities in mass% on the surface of the leveled improved soil; a stirring step of stirring the surface layer of the ground by a tractor equipped with a Taylor attachment; a finishing step of pulling a kannakutter with steel materials assembled in a frame shape by a tractor and leveling the ground with the kannakutter; a final finishing step of pulling a ground mat by a tractor and leveling the ground with the ground mat for final finishing; A ground soil improvement method having the above steps.

2. The soil improvement sand mixing step is carried out before the water retention effect material mixing step. The ground soil improvement method according to Claim 1.

3. The kannakutter is formed by projecting a flat blade member downward from the lower edge of the steel material assembled in a frame shape. The ground soil improvement method according to Claim 1 or Claim 2.

4. The kannakutter is towed with a weight placed on the rear side. The ground soil improvement method according to Claim 3.

5. The stirring step stirs the 1 cm to 8 cm surface layer of the ground. The ground soil improvement method according to Claim 4.

6. The stabilization process is arranged at the rear of the tractor, and the stabilizer is put into a hopper with a wide discharge port in the width direction and is sprayed on the ground. The method for improving the soil quality of the ground according to claim 5.

Images