JP7072758B2 - Slope reinforcement method using soil base material with weed control function - Google Patents

Description

The present invention reinforces a slope on a small slope such as a slope existing at the boundary surface between a paddy field or a field partitioning a paddy field or a farmland, or a retaining wall of an irrigation canal provided adjacent to a rice field or a field. It is about the construction method.

As a slope reinforcement method, the surface is protected with a wire net or the like so that the exposed ground does not collapse due to civil engineering work, or a structure such as metal or resin is attached to the surface, and mats containing plants are attached. There is a greening method that stabilizes the ground by the roots that the plants that grow from there grow.

Generally, as a construction method used in combination with protection of wire nets and attachment of structures such as metals, soil materials containing mortar and adhesive polymer resin on the surface are deposited on the slope at high pressure to reinforce the surface. , The spraying method is widely used.

The spraying method was applied to large-scale areas such as road construction in forest roads and other forest roads, and ground improvement on the hillsides associated with land reclamation. The main reason for this is that the construction equipment for spraying soil materials at high pressure is large.

Specific examples of the spraying work include a construction method involving greening of the slope using a soil base material containing seeds as described in the preceding document 1, and mortars as described in the document 2. There is something to prevent collapse by spraying.

JP-A-2004-89183 Tokukousho 58-19816

For each of the preceding documents 1 and 2, a large-scale place such as a slope on a hillside is assumed, and since the material to be sprayed is soil, mortar, etc., the equipment becomes large-scale. For example, many concrete-compatible pumping machines weigh more than 1 ton, and serve as a pump for sending water to the pumping machine, a compressor for sending high-pressure air to the pumping machine, and a power source for these. It will be a large-scale operation, such as requiring at least two medium-sized trucks just to bring the equipment to the construction site with a generator or the like.

On the other hand, the slope is not limited to the hillside, and there are also small-scale ones such as the side of the ridge that divides rice fields and fields.

By solidifying the soil, the road is made to function as a road by allowing trucks that carry agricultural vehicles and harvested products to pass through, but the width of the road is the minimum necessary and large-scale spraying. It is difficult to bring in equipment for construction work.

In addition, a large amount of water is required for rice cultivation, so irrigation canals are arranged in each section of the agricultural land, the width is minimal, the depth is about several tens of centimeters, and water flows. It is desirable to simplify reinforcement such as solidifying the part with concrete.

Normally, grass grows naturally on the footpath, so it was necessary to weed from time to time. It is beneficial to cover the side of the ridge with a material that has a weed control function so that grass does not grow, but it has the following problems and can be done at the same time as the work to reinforce the side of the ridge. It can be said that the construction of is difficult.

(1) Since the side surface of the footpath is almost vertical and steep, the material cannot be effectively constructed unless it is sprayed.

Since the side surface is vertical, if the method of reinforcing the surface is to apply, a frame structure such as earth retaining is applied to the surface, and the reinforcing material is poured and hardened. For example, concrete is assumed as the reinforcing material. At this time, since the reinforcing material tends to fall down due to the gravity of the material itself, there is a problem that the material cost increases by making the reinforcing material thicker than the minimum necessary amount.

(2) It is difficult to bring in equipment for the spraying method because the ridge road is secured only wide enough for agricultural vehicles and light trucks to pass.

As mentioned above, it is possible to cover the surface with the minimum necessary reinforcing material by using the spraying method, but due to the width of the ridge road that is the plot of agricultural land and other restrictions, equipment for performing the spraying method has been introduced. On the other hand, it is difficult, but since the construction area is not very large, there is also a problem that the cost for preparing the construction and others is high.

In the present invention, the material is selected in order to realize the spraying method on the footpath, and the spraying method is realized even with a small-scale pumping machine. The study was conducted with the aim of realizing weed control work on the side of the footpath.

In order to reduce the management cost of the ridge, it is necessary to cover the surface with a weed-proof material to prevent weeds from growing. By covering the surface with a hard material, weed control is realized by preventing plants from growing on the surface.

On the other hand, since it is necessary to prevent weeds from growing and at the same time to prevent the destruction of the soil ecosystem as much as possible, it is necessary to realize not only a hard surface but also air permeability and water permeability.

In the present invention, bamboo, which grows quickly and is surplus in mountains and the like and needs to be effectively utilized, is selected as one of the weed control materials, and is a soil base having a weed control function composed of natural materials. Realized the material.

In claim 1 of the present invention, bamboo chips obtained by drying and finely crushing bamboo are selected as the main material of the soil base material, and the weight ratio thereof is 50% of the whole, so that the bamboo has a weed-proof function and is ventilated. Achieved sex and moisture permeability.

Further, as a solidifying material for realizing the weed control function, a solidifying material composed of magnesium oxide and magnesium chloride is used, and the soil base material is made of only natural materials.

Another feature is that the specific gravity of the soil base material is lightened by using ash, which is the combustion residue of wood chip fuel, as the material for blending the solidified material around the bamboo chips.

Furthermore, regarding the process of actually spraying the soil base material, by mixing the minimum amount of water necessary for uniformly mixing the soil base material, the pressure for spraying the soil base material can be reduced. ..

Since the spraying device is configured so that the water for fixing the soil base material on the side surface of the footpath is mixed immediately before the nozzle as a separate route, it can be realized with a small equipment for performing the spraying method.

The material to be sprayed is light, and since the spraying work is done by mixing water just before the nozzle, the necessary equipment can be done on a small scale, like the side of the ridge road that has been avoided in terms of cost so far. Spraying work can be applied even in a small area with a small area.

In claim 2 of the present invention, since the amount of water when mixing and stirring the soil base material according to claim 1 is the minimum necessary, the amount of water to be fixed on the slope as a spraying method is set as the amount of water to be fixed on the slope. It is noted that there are more cases of mixing on the side immediately before the spray nozzle, which is in a high pressure state.

As a result, the scale of the equipment required for pumping the soil base material can be reduced, and the spraying method can be adopted even on a small slope such as a footpath.

By the above construction, the surface of the soil base material is hardened, so that the weed-proof effect on the side surface is obtained and the growth of weeds on the footpath is suppressed, so that mowing is unnecessary and the management cost is reduced.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

Since the soil base material used in the present invention is composed of a naturally derived material, it is characterized in that it does not generate industrial waste even when it needs to be demolished due to re-construction after construction.

First, prepare bamboo chips that have been sufficiently dried and crushed to a length of about several millimeters. The weight ratio occupies 50%, and the fiber structure of the bamboo itself and the stacking of chips ensure the air permeability and water permeability of the finished soil base material.

In order to harden the surface of bamboo chips, ash is selected as a binder material as a fluid, fine and lightweight material. This ash is the combustion residue of wood chip fuel and exists in the form of fine powder. Since it is a combustion residue, the water content is extremely low, and the shape of the wood chips as unburned residue is almost nonexistent.

This ash is blended in the range of 35 to 45% by weight. A higher ratio of solidifying material, which will be described later, is advantageous for surface strength, but the weight ratio of standard ash is specified as 40% in consideration of the material cost of solidifying material.

The remaining 10% by weight is used as a solidifying material composed of magnesium oxide and magnesium chloride.

Generally, it is a material extracted from seawater as bittern, but it can be used as a material to harden the surface by mixing it with decomposed granite soil, and it has been used for ancient civil engineering works such as soil floors and river embankments. rice field.

FIG. 1 shows the state of the surface when each material of these soil base materials is mixed and applied to a slope or the ground. A mixture of ash 12 and solidifying material 13 is bonded around the bamboo chips 11 that are spatially dispersed to form a soil base material 10 having a strong surface.

By adding water during construction, the ash 12 and the solidifying material 13 are appropriately agitated and sufficiently mixed to solidify the surface as a binder for the bamboo chips 11. However, depending on the construction condition, pressure is applied from the surface to compact the surface. It functions as a stronger soil base material 10.

FIG. 2 shows an outline of the soil base material 10 containing each of these materials to be applied to the slope by spraying work.

The spraying machine 21, which is a machine for performing spraying work, is composed of a stirrer 22, a pressure feeder 23, a compressor 24, a nozzle 25, and a power supply (not shown).

An amount of water 31 in which each material of the soil base material 10 is mixed and the material is sufficiently agitated is charged into the stirrer 22. The soil base material 10 containing water 31 and mixed by the stirrer 22 is in a state where it can be sprayed as a granular mass.

The soil base material 10 carried from the stirrer 22 to the pumping machine 23 is pumped toward the nozzle 25 by the compressed air generated by the compressor 24.

Water 32 is supplied to the nozzle 25 from a route different from that of the soil base material 10, and the water 32 in a high pressure state is mixed at the end of the nozzle 25 via the pump 26 and sprayed onto the slope 41. , Stick.

Since the water 31 contained in the soil base material 10 is the minimum necessary, the weight of the mixture does not become heavy, and the pumped material is mixed with the water 32 immediately before the nozzle to perform the spraying work. Does not have to be large.

Using the above equipment, spraying work can be realized even in a small place, but the construction situation is described below.

FIG. 3 shows the outline of the construction of the footpath.

As described above, it is sufficient for agricultural vehicles, light trucks, and the like to pass through the footpath 51, so that the width is usually less than 2 m.

The difference in height from the rice field is about several tens of centimeters, and the maximum is less than 50 cm, and the area for spraying is not so large compared to the slope of a general hillside. A sprayer is installed on the footpath 51, and a worker enters the rice field 50 and sprays soil base material on the side wall surfaces 52 on both sides of the footpath 51 to fix the surface and provide a weed-proof function.

Upland farming and rice cultivation are carried out in rice fields, but in many cases, irrigation canals are arranged for rice cultivation. FIG. 4 shows the outline of the spraying work on the retaining wall of the irrigation canal.

The depth of the irrigation canal is lower than that of the rice field, and the width is not so wide. For this reason, it is necessary to operate the construction in the same way as a normal ridge.

A spraying machine is arranged in the ridge 51, a worker is arranged in the irrigation canal 54, and spraying work is performed on the retaining walls 53 on both sides to fix the surface. Between the irrigation canal 53 and the rice field 50, a footpath 51 that divides the area of the rice field 50 is arranged, and a worker is assigned to the rice field 50 to perform spraying work on the side wall surface 52.

Up to this point, it was sprayed, but in order to repair and harden the surface of a flat place, there is also a method of kneading the soil base material 10 with water and applying it directly, and it is also desirable to use it together.

As an example of the direct coating method, FIG. 4 shows an outline of the construction of the agricultural vehicle introduction section.

Similar to the conventional construction on the side surface of the footpath, a worker is assigned to the rice field 50 to perform the spraying work on the side wall surface 52 of the footpath.

The agricultural vehicle introduction portion 55 is obtained by excavating a part of the footpath 51 to provide a gentle slope, and a side wall surface 56 is also formed between the footpath and the slope.

As for the side wall surface 56, the surface is hardened by spraying work as in the case of the side wall surface 52. After that, the soil base material 10 to which water has been added is deposited on the agricultural vehicle introduction section 55, and pressure is applied from the surface to compact the soil base material 10. The pressure applied at this time may be about the weight of a person, and it is not necessary to use a special construction machine.

By the above construction, the spraying work can be realized even on the ridge road where the equipment used for the spraying work could not be introduced in the past. Since the wood has a weed-proof function, it has an advantage that the management cost can be reduced because the mowing for the maintenance of the footpath can be omitted.

In the present invention, a rice field is illustrated as a construction site as an example, but there are other fields, orchards, etc. as the agricultural land where the footpath is arranged, and the present invention is the farmland of these other types within the range not deviating from the purpose. It can also be applied to the adjacent ridge road.

Surface condition when a mixture of bamboo chips, ash and solidifying material functions as a soil base material Schematic diagram of spraying work Construction schematic diagram of the ridge road Construction schematic diagram of the irrigation canal Construction schematic diagram of agricultural vehicle introduction route

10 Soil base material 11 Bamboo chips 12 Ash 13 Solidification material 21 Sprayer 22 Stirrer 23 Pumping machine 24 Compressor 25 Nozzle 26 Pump 31, 32 Water 41 Slope 50 Rice field 51 Aqueduct 52, 56 Side wall 53 Aqueduct 54 Farming Vehicle introduction part

Claims (2)

A soil-based reinforcement material is composed of a mixture of finely crushed and dried bamboo chips, ash produced as a combustion residue of wood chip fuel, and a solidifying material formed from magnesium oxide and magnesium chloride.
In the soil base reinforcing material, the weight ratio of the bamboo chips is 50%, and the weight ratio of the ash is 35% or more and less than 45%.
Water is added to the soil base material, and the agitated and moist material is pressure-fed in a high-pressure state and sprayed onto the slope by mixing it with water in a high-pressure state immediately before the slope to be sprayed. Characterized slope reinforcement method. The slope reinforcement method according to claim 1, wherein the amount of water when stirring the soil base material is smaller than the amount of water mixed immediately before the slope.

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