JP7250280B2 - vegetation sandbag - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vegetation sandbag placed at the lower end of a slope during slope protection work.

In order to prevent erosion and collapse of slopes formed by shaving and embankment, slope protection construction such as vegetation (thick layer) base material spraying method for greening slopes is carried out from the viewpoint of environmental protection. be implemented. At that time, in order to stabilize the slope, a sandbag filled with sand is placed at the lower end of the slope.

For example, in Patent Document 1, the surface and inner surface of a bag body are formed of a net having a mesh that does not hinder the germination and growth of plants, and the back surface of a water-permeable sheet made of natural fibers or chemical fibers. discloses a vegetation bag having a vegetation strip attached to it.

Japanese Utility Model Laid-Open No. 62-122549

Conventionally, many chemical fibers have been used for sandbags from the viewpoint of economy, but sandbags using chemical fibers deteriorate due to ultraviolet rays, alkaline materials, and the like. As the deterioration of the sandbag progresses, the sandbag ruptures and the filling material in the sandbag flows out. There are also sandbags that use UV-resistant fibers, but they have drawbacks in terms of economy and appearance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vegetation sandbag in which the filling material in the sandbag does not flow out when the sandbag deteriorates and breaks.

In order to achieve the above object, the vegetation sandbag according to the present invention is a resin-based sandbag obtained by mixing molten slag made from municipal waste, a base material mainly composed of organic matter, a binder, fertilizer, and seeds. It is characterized by being filled in a sandbag made of chemical fibers.

Here, the base materials mainly composed of organic matter include bark compost, peat moss, fiber-improved soil, and the like.

Resin-based chemical fibers are degraded by ultraviolet rays and alkali components of fillers. As a result, sandbags made of resin-based chemical fibers eventually break. However, by mixing molten slag with the filling material, seeds germinate in the sandbag before the sandbag is broken, and roots, stems, and leaves grow. As a result, the filling material and the roots/stalks are integrated in the sandbag, and the filling material can be prevented from flowing out when the sandbag is broken.
In addition, by using the same kind of seeds in the vegetation sandbags and seeds used in the vegetation base material spraying method, the soil retaining sandbag construction area and the spraying area can be integrated.
Furthermore, by mixing molten slag with the filling material, it is possible to ensure water permeability and water retention as a vegetation sandbag, and to promote the growth of roots, stems and leaves due to voids formed in the filling material.

Moreover, in the vegetation sandbag according to the present invention, it is preferable that the mass ratio of the molten slag in the filling material with which the sandbag is filled is 30% by mass or more and 50% by mass or less.

If the mass ratio of the molten slag is less than 30% by mass, the period until the sandbag ruptures becomes longer, causing a deviation from the plant growth period, and water permeability decreases, adversely affecting plant growth. On the other hand, when the mass ratio of the molten slag exceeds 50% by mass, it is necessary to increase the proportion of the bonding agent in order to ensure the stability of the filled molten slag. An increase in water retention (that is, a decrease in water retention) adversely affects plant growth.

In the vegetation sandbag according to the present invention, by mixing molten slag with the filling material, the seed germinates in the sandbag and the roots, stems, and leaves grow before the sandbag is broken. The stems are integrated in the sandbag, and the filling material can be prevented from flowing out when the sandbag is broken.

It is a sectional side view of the slope formed by the vegetation base material spraying method. 1 is a schematic diagram of a gasification melting furnace used for producing molten slag contained in a vegetation sandbag according to one embodiment of the present invention; FIG.

Next, an embodiment embodying the present invention will be described with reference to the attached drawings for understanding of the present invention. In the present specification and drawings, constituent elements having substantially the same functions are denoted by the same reference numerals, thereby omitting redundant description.

FIG. 1 shows a side cross section of a slope 30 formed by the vegetation base material spraying method. The procedure of the vegetation substrate spraying method is as follows.
(1) Clean the slope 30 by weeding the slope 30, removing floating stones, and the like.
(2) The net-like vegetation net 32 and the like are laid on the slope 30, and the main anchor pins 33 and the auxiliary anchor pins 34 are driven into the slope 30 to fix the net-like vegetation net 32 and the like to the slope 30. For the vegetation net 32 and the like, a rhombic wire mesh having a mesh size of 50 mm or more is used. The main anchor pin 33 has a diameter of about 16 mm and a length of about 400 mm, and is driven about 0.3 per 1 m ² . The auxiliary anchor pins 34 have a diameter of 9 mm and a length of 200 mm, and are driven about 1.5 per 1 m ² .
(3) Place a vegetation sandbag 35 along the lower end of the slope 30 .
(4) The vegetation base material 31 is sprayed onto the slope 30 using a sprayer (not shown). The spray thickness is about 3 cm to 10 cm.

The vegetation sandbag according to one embodiment of the present invention is made from resin-based chemical fibers by mixing molten slag made from municipal waste, organic base material, binder, fertilizer, and seeds. It is filled in a sandbag bag.
The sandbags used in the vegetation base material spraying method are usually removed after a certain period of time has passed since the construction is completed, but the vegetation sandbags according to the present embodiment are not removed and are used as they are.

Organic-based base materials include bark compost, peat moss, and fibrous improved soil. Binders include cement and polymer resins. Fertilizers include warm-release fertilizers and chemical fertilizers containing nitrogen, phosphorus, and potassium. These include tangs such as tang, legumes such as sycamore, chrysanthemums such as mugwort, and vegetation such as shabu and mountain cherry.

As resin-based chemical fibers, polyethylene, polyester, etc., are assumed to be degraded by ultraviolet rays and alkalis.

The mass ratio of the molten slag in the filling material filled in the sandbag is 30% by mass or more and 50% by mass or less. A specific mass ratio is adjusted depending on the period until the sandbag breaks.

Molten slag is produced in general waste melting facilities.
The molten slag produced by the above equipment has a soluble silicic acid concentration of 25% or more and an alkali content of 30% or more, and can promote the growth of plant roots and stems. In addition, from the viewpoint of ensuring the consolidation property after construction, the design CBR value of the molten slag is preferably 20% or more.
The amount of molten slag to be used is 100 kg to 500 kg per sprayed area of 1000 m ² with a spray thickness of 3 cm to 5 cm.

FIG. 2 shows a gasification melting furnace 10 used for producing molten slag. The gasification and melting furnace 10 is a shaft furnace type gasification and melting furnace. The furnace body is composed of a cylindrical shaft portion 11 , an inverted conical portion 12 whose diameter decreases downward from the lower end of the shaft portion 11 , and a furnace bottom portion 13 .

At the top of the shaft portion 11, an input port 20 for inputting general waste and auxiliary materials (coke, limestone, or silica sand) is provided, and on the side of the input port 20, exhaust gas generated in the furnace is discharged. A discharge port 21 is provided for discharge.
On the other hand, a side wall of the furnace bottom 13 is provided with a tapping hole 18 for discharging the molten material produced in the furnace.

Further, the lower end portion of the side wall of the shaft portion 11 and the side wall of the furnace bottom portion 13 are provided with blowing ports 15 and 14 for supplying air into the furnace. Air blown by a blower 16 is supplied into the furnace through blowing ports 15 and 14 . The air supplied into the furnace from the blower port 14 provided on the side wall of the furnace bottom 13 is converted into oxygen-enriched air by the oxygen generator 17 .

Next, a method for producing molten slag using the gasification melting furnace 10 having the above configuration will be described.
Municipal waste, coke, and limestone or silica sand are charged into the furnace from the inlet 20 . The amount of coke charged into the gasification melting furnace 10 is 20 kg to 70 kg per 1 ton of input general waste, and the amount of limestone or silica sand is 15 kg to 70 kg per 1 ton of input general waste. Municipal wastes are wastes other than industrial wastes, and include designated industrial wastes processed by local governments.

Inside the gasification melting furnace 10, from the top, there are a drying/preheating zone A (300°C to 400°C), a pyrolysis gasification zone B (300°C to 1000°C), a combustion zone C (1000°C to 1700°C), and a melting zone. It is classified as D (1700°C to 1800°C).

[Melting treatment]
The general waste introduced into the furnace through the inlet 20 is heated in the drying/preheating zone A, and the moisture contained in the general waste is evaporated by the combustion cracked gas rising from the lower part of the furnace. The dried general waste gradually descends, and combustible components are gasified in the pyrolysis gasification zone B and discharged from the discharge port 21 .
The ash in the municipal waste passes through the combustion zone C and descends to the melting zone D together with the coke. The coke that has fallen to the melting zone D is burned at a high temperature of 1700 ° C. to 1800 ° C. by the oxygen-enriched air blown from the blower 14, and by forming a coke bed layer (grate) in the furnace bottom 13, a reducing atmosphere. formation and stable melting of ash. Low-boiling-point heavy metals (such as lead) in the ash volatilize and become molten fly ash, which is discharged from the discharge port 21 together with the exhaust gas.

[Exhaust gas treatment]
Exhaust gas discharged from the exhaust port 21 is introduced into a cyclone (not shown) as necessary, and combustible dust in the exhaust gas is collected by the cyclone. The collected combustible dust is blown into the gasification melting furnace 10 through the blower port 14 . On the other hand, the exhaust gas discharged from the cyclone is introduced into the combustion chamber (not shown) and completely combusted, heat is recovered in the boiler (not shown), and finally released into the atmosphere from the chimney (not shown). .

[Water granulation treatment]
The melted ash is discharged from the outlet 18 in a state in which the fluidity is sufficiently enhanced by the basicity adjusting action of limestone, and is introduced into the water granulator 22 through the gutter 19 .
The water granulator 22 includes a casing 23 that stores cooling water for cooling and solidifying the melt discharged from the gasification and melting furnace 10, and a water granulator that injects water into the melt discharged from the gasification and melting furnace 10 to melt it. It is equipped with a jet nozzle 24 for finely dispersing matter and a scraper-type conveyor 25 installed in a casing 23. - 特許庁The molten material finely dispersed by the water jet is cooled and solidified in the casing 23 to become molten slag and metal such as iron and copper.
[Metal separation process]
Metals are separated and removed from the molten slag by the magnetic separator 26, resulting in molten slag containing almost no harmful substances.

[Crushing treatment/grinding treatment]
Molten slag produced by rapid crushing of the melt with water has a non-uniform particle size distribution and includes needle-like and angular surfaces. Therefore, crushing treatment or grinding treatment is performed using a crushing device (not shown) or a grinding device (not shown) to adjust the particle size and smooth the surface of the molten slag. For particle size adjustment by crushing or grinding, the processing conditions are set so that the particle size of the molten slag is 5 mm or less.
The design CBR value of the molten slag becomes 20% or more by grinding or crushing the molten slag.

It has been confirmed that the content and elution amount of hazardous substances contained in the molten slag produced by the above method are one digit smaller than the environmental standard values of the Soil Contamination Countermeasures Law.

Although one embodiment of the present invention has been described above, the present invention is not limited to the configuration described in the above-described embodiment. Other possible embodiments and modifications are also included.

10: gasification melting furnace, 11: shaft portion, 12: inverted cone portion, 13: furnace bottom portion, 14, 15: blower port, 16: blower, 17: oxygen generator, 18: outlet, 19: gutter, 20 : Input port, 21: Discharge port, 22: Water granulator, 23: Casing, 24: Injection nozzle, 25: Conveyor, 26: Magnetic separator, 30: Slope, 31: Vegetation substrate, 32: Reticulated vegetation net , 33: main anchor pin, 34: auxiliary anchor pin, 35: vegetation sandbag, A: drying/preheating zone, B: pyrolysis gasification zone, C: combustion zone, D: melting zone

Claims (2)

It is characterized by a mixture of molten slag made from general waste, base material mainly composed of organic matter, binder, fertilizer, and seeds, and filled in sandbags made of resin-based chemical fibers. And vegetation sandbags. 2. The vegetation sandbag according to claim 1, wherein the mass ratio of said molten slag in the filling material filled in said sandbag is 30% by mass or more and 50% by mass or less.

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