JP3149162B2 - Surface soil pressure conveying method and slope greening method of slope greening method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for pressurizing and transporting topsoil as a greening base of a slope with a material hose of a spraying machine and spraying the slope with a spray from a spray nozzle at the tip of the hose. The present invention relates to a surface earth pressure conveying method of a surface greening method and a slope greening method using the same.

[0002]

2. Description of the Related Art For example, slopes (slope) formed by excavation or embankment of the ground are protected and reinforced by various slope construction methods, but in the recent civil engineering business, natural destruction is a serious problem. From the viewpoint of improving the landscape by greening, preserving the environment and preserving nature, it is strongly necessary to create a growth base (greening base) on which the plants can grow on the slope and protect the slope with these plants. Is desired.

[0003] As an example of a method called a slope greening method, for example, a base material mainly composed of fertilizer such as bark compost and peat moss is compressed with a material hose of a spraying machine such as a mortar spraying machine using compressed air. Convey with (pneumatic conveyance)
There is known a method using a so-called thick base material spraying method in which a growth base is formed by spraying the slope with spray from a spray nozzle at the tip of the hose. Then, by mixing seeds of an appropriate plant or the like with the growth base and growing the plant on the growth base, it is possible to restore a natural living body on a slope.

[0004]

The base material in the thick-layer base material spraying work is an improved soil completely mixed with an appropriate fertilizer and completely unrelated to the local topsoil. Unnatural vegetation ecology due to the difference in soil quality from the topsoil is likely to occur on this greening base. Therefore, in the known slope revegetation method, it is not always easy to revegetate on the slope close to the original natural forest.

[0005] Further, excavated soil generated by excavation of the ground is a large amount, and not only is it difficult to secure a disposal place, but also the cost is large. Treatment of such excavated soil is being sought.

Further, in the case of the thick layer base material spraying method, since the laying thickness is about 5 cm, the reinforcement of the slope by the root system of the plant may not be sufficient.

Here, for example, in the slope greening method disclosed in Japanese Patent Application Laid-Open No. 09-041386, excavated soil generated by excavation of the ground is reused as topsoil, and is laid on the slope. It enables greening without discomfort close to the local natural forest and reduction of excavated soil to be discarded. Therefore, it has been proposed and promoted to use topsoil (generated topsoil) generated by this known slope revegetation method as a base material in a thick-layer base material spraying work.

However, since the topsoil of the ground generally contains a large amount of clay, if the topsoil obtained and secured at or near the site is simply attempted to be conveyed and sprayed with the material hose of a spraying machine, the topsoil of this topsoil is likely to be removed. Adheres to the inner surface of the hose under its own viscosity, causing the hose to clog.

[0009] Therefore, usually, an appropriate amount of sand is mixed with the collected topsoil at or near the site, so that the topsoil containing a large amount of clay is granulated to the extent that it can be conveyed by compressed air. The topsoil is transported and sprayed with the material hose of the spraying machine, enabling spraying on slopes.

[0010] However, since sand has high water permeability, a large amount of sand mixed into the topsoil, which is the soil of the greening base, tends to cause a decrease in water retention and moisture retention on the greening base, which hinders plant growth. There is a risk of becoming. Therefore, it is not preferable to mix sand with the topsoil, which is a growth base (greening base) for plants, from the viewpoint of water retention and moisture retention.

[0011] The present invention provides a topsoil pneumatic conveying method of a slope revegetation method in which a generated topsoil obtained by adding a fertilizer to a collected topsoil at or near a site can be conveyed with a material hose of a spraying machine, and The purpose of the present invention is to provide a slope revegetation method for constructing a revegetation base by using this topsoil pressure air conveyance method.

[0012]

In order to achieve this object, according to the method for conveying pneumatic overburden of the slope revegetation method of the present invention, a stone having a predetermined size or more is obtained from the excavated topsoil secured or collected at or near the site. Gravel and root system are removed to separate topsoil. Then, the separated topsoil is mixed with a granulating agent that promotes agglomeration of soil particles and a predetermined auxiliary agent that strengthens and retains the aggregate structure of the soil particles.
At least a predetermined fertilizer material is further mixed to generate a generated topsoil that can be conveyed with compressed air under a supply of compressed air through a material hose of the spraying machine.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

[0014] In one embodiment of the topsoil pressure air conveying method of the slope greening method according to the present invention, a thick base material spraying method using a mortar spraying machine is used, and a predetermined topsoil called mixed topsoil such as fertilizer material is used. The method of spraying and laying the topsoil on the slope will be described below as an example of a slope greening method.

As shown in FIG. 1, in this slope greening method, a mortar spraying machine 10 is used as a spraying machine for spraying a predetermined topsoil 12.

The mortar spraying machine 10 is configured so that the generated topsoil 12 supplied to the spraying machine main body 20 can be conveyed inside the material hose 24 together with the compressed air from the compressor 22 (pneumatic conveyance), and conveyed inside the hose. The generated topsoil is sprayed onto the slope 28 by spraying from the spray nozzle 26 at the tip of the hose under the pressure of compressed air to form a growth base (greening base) 32 on which plants can grow. .

The reference numeral 30 in FIG.
Shows a generator provided and connected as a power source.

Here, in the present invention, a pebble and a root system of a predetermined size or more are removed from a topsoil secured by excavating the site or the vicinity of the site (herein referred to as excavated topsoil) to obtain a sorted topsoil. Can be used as a topsoil 12 for generating a plant growth base (greening base).

As shown in FIG. 2 (A), the topsoil secured by excavation of the topsoil 42 on the ground 41 at or near the site, ie, the excavated topsoil, is applied to a suitable sorting machine, for example, a suitable mesh-shaped flat claw bucket. The so-called sieve processing (bucket mixing) is performed by a backhoe 46 equipped with 44,
Separated topsoil 48 is collected from the excavated topsoil by separation by removing rubble and roots of a predetermined size or more. Here, for example, a topsoil of a lump of 30 mm or less is collected as a separated topsoil 48.

Of course, separated topsoil from excavated topsoil (topsoil 42)
Sorting and sampling of 48 are not limited to the method using the sorting machine, and the sorted topsoil may be collected by other machines and methods.

As shown in FIG. 2 (B), the collected fractionated topsoil 48 is temporarily stored in, for example, a hopper 50, and from this hopper via a belt conveyor 52 or the like, a mixer,
For example, it is supplied to a paddle mixer 54. Then, in the present invention, in the paddle mixer (mixer) 54, the fractionating topsoil 48 is mixed with, for example, as a primary mixture, a granulating agent 56 that promotes agglomeration of soil particles.

Topsoil 42 on the ground due to natural sedimentation
Generally contains a large amount of clay, so the fractionated topsoil 48 fractionated and collected from this topsoil is not suitable for pneumatic conveyance through the material hose of a mortar spraying machine under the pressure of compressed air. However, with the mixing of this agglomerated material 56,
Due to the formation of the aggregate structure of the soil particles, the topsoil, that is, the soil of the fractionated topsoil 48 is appropriately granulated, so that the topsoil can be prevented from adhering to the inner surface of the material hose 24 of the mortar spraying machine by this granulation ( (See FIG. 1).

The topsoil 48 (herein referred to as temporary mixed topsoil) 60 produced by mixing the fractionated topsoil 48 and the aggregating agent 56 in the paddle mixer 54 is conveyed by a belt conveyor 62 and the like. Occasionally, a predetermined auxiliary agent 58 that strengthens and retains the aggregate structure of the soil particles is further mixed into the temporarily mixed topsoil 60 as a primary mixture.

As the auxiliary agent 58, for example, a lime-based auxiliary agent mainly composed of quicklime or nitrite or a cement-based auxiliary agent mainly composed of cement can be used.

As described above, if the auxiliary agent 58 is mixed with the temporarily mixed topsoil 60 to strengthen and maintain the aggregate structure of the soil particles, powdering of the soil particles can be prevented. Without inviting the like, the temporary mixed topsoil, and eventually the separated topsoil 48 excavated and collected from the site or near the site, can be pneumatically conveyed by the material hose 24 of the spraying machine.

That is, by mixing the aggregating agent 56 and the auxiliary agent 58, the topsoil 42 in the material hose 24 of the spraying machine,
As a result, the compressed air of the topsoil 48 can be conveyed without mixing sand.

The topsoil (herein referred to as mixed topsoil) 63 produced by the primary mixing of the aggregating agent 56 and the auxiliaries 58 into the fractionated topsoil 48 is transported by a belt conveyor 62, and then passed through a predetermined screen. Sifted by 64. Here, for example, a topsoil having a lump of 15 mm or less is separated and collected as useful mixed topsoil, and is conveyed to a predetermined position by a belt conveyor 66 or the like.

The mixed topsoil 63 sifted is shown in FIG.
As shown in FIG. 7, after being stored in the hopper 68, the mortar spraying machine 10 is put into the weighing device 72 via the belt conveyor 70, etc.
Is conveyed and injected into the spraying machine main body 20.

Here, the mixed topsoil 63 charged into the spraying machine main body 20 is secondarily mixed with the fertilizer material 78 by, for example, a predetermined mixer provided in the spraying machine main body. Then, the generated topsoil 12 formed by the secondary mixing is compressed and conveyed inside the material hose 24 by compressed air from the compressor 22, and is sloped by injection from the nozzle 26 at the tip of the hose.
By spraying the greenery 28, the greening base 32 is formed on the slope (see FIG. 1).

The topsoil collected by excavation of the ground 41 or the like, that is, the separated topsoil 48 here contains many kinds of useful microorganisms grown under the local nature. Topsoil suitable for plant growth by mixing with highly moisturizing fertilizer material 78 that promotes the growth and reproduction of
You can get 12. As the fertilizer material 78, for example, a plant fiber fertilizer such as bark compost can be used.

As described above, according to the topsoil pressure pneumatic conveying method of the slope greening method of the present invention, the highly viscous fractionated topsoil 48 excavated and collected at or near the site is separated into a granulating agent 56 and an auxiliary agent 58. The resulting topsoil 12 is obtained after the soil is improved by mixing of the above, so that the pneumatic conveyance of the generated topsoil via the material hose 24, that is, the blasting of the generated topsoil by the mortar spraying machine 10 is sufficiently possible. Therefore, topsoil excavated and collected at or near the site on the greening base 32 in the slope greening method using the thick base material spraying method using the mortar spraying machine 10
42 are available.

Thus, the topsoil at or near the site
If 42 is used as a greening base 32, greening accompanied by the growth of buried seeds contained in the topsoil can be obtained, and the vegetation ecology that is as close as possible to the original natural forest at the site can be reproduced. Greening without discomfort is also possible on the slope 28.

By using the topsoil 42 generated by excavation on site for the greening base 32, the amount of excavated soil to be discarded can be reduced. In other words, the reduction in the amount of excavated soil enables easy disposal and reduction of disposal cost.

Further, the generated topsoil 12 generated here includes:
Since the aggregating agent 56 and the auxiliary agent 58 are mixed as a primary mixture to the fractionated topsoil 48, the laying thickness of the topsoil produced by spraying is sufficiently thick under the strengthening of the soil agglomeration, for example,
It can be as thick as 20-30cm. Therefore, the slope 28 can be sufficiently reinforced by the root system of the plant.

In the present invention, since the compressed top soil 12 can be conveyed and injected by the material hose 24 of the mortar spraying machine without mixing sand,
There is no more sand than necessary on the greening base 32 of the slope 28. Therefore, it is possible to prevent a decrease in water retention and moisture retention in the greening base 32 of the slope 28, and it is possible to surely improve a plant growth environment on the greening base.

In the embodiment of the present invention, the aggregating agent 56 and the auxiliary agent 58 are separated by primary mixing to separate topsoil 48.
Mixed with the topsoil
63, mixed bark compost (fertilizer material) 78 by secondary mixing,
The generated topsoil 12 is generated. However, the mixing and generation procedure described above is merely an example of a procedure from generation of the topsoil 42 to generation of the generated topsoil 12, and is not limited thereto.
For example, the distinction between the primary mixing and the secondary mixing may be eliminated, and the aggregated agent 56, the auxiliary agent 58, and the bark compost 78 may be mixed almost simultaneously with the fractionated topsoil 48 to generate the generated topsoil 12.

In the above-described embodiment, lime-based auxiliaries and cement-based auxiliaries are given as examples of auxiliaries 58. However, it is preferable to use lime-based auxiliaries as auxiliaries here. . In lime-based auxiliaries, slaked lime, which is the main component of the lime-based auxiliaries, has the property of neutralizing acidic soil. Is obtained.

By making the fractionated topsoil 48 and thus the generated topsoil 12 a neutral soil, a soil environment suitable for the growth and propagation of useful microorganisms in this soil can be maintained. Therefore, auxiliaries
If a lime-based auxiliary agent is used as 58, a generated topsoil 12 suitable for germination and growth of a living body of a plant can be easily secured.

In the embodiment of the present invention described above, a slope revegetation method using a thick layer base material spraying method by the mortar spraying machine 10 is exemplified, and the material hose 24 of the mortar spraying machine in this method is used. The pressurized conveyance of the generated topsoil 12 and the injection have been specifically described, but a method of conveying the generated topsoil by air and spraying the generated topsoil on the slope 28 under the pressure of the compressed air is sufficient. Not limited,
The topsoil pressure conveying method of the present invention may be applied to other construction methods, for example, a so-called continuous fiber reinforced soil construction method in which continuous long fibers are three-dimensionally entangled in soil, a continuous fiber greening foundation construction, and the like.

Here, a slope greening method applying the above-mentioned topsoil pressure conveying method will be described below.

It is to be noted that the topsoil 42 from the site or the vicinity of the site is used.
The steps from excavation to the formation of the generated topsoil 12 from this topsoil are the same as those in the above-described embodiment in the slope greening method according to another embodiment of the present invention. Is omitted here.

As shown in FIGS. 3 and 4, in the slope greening method according to the present invention, a concrete frame 80 for stabilizing the slope is previously applied by a concrete frame method such as a free frame method or an intersection block method. You. And
In the frame partitioned by the concrete frame 80, a water retaining net 82 made of, for example, coconut fiber is laid and fixed for the purpose of retaining water of the greening base.

Next, as shown in FIG.
In the same manner as in the above-described embodiment, the separated topsoil 48 collected at the site or near the site is mixed with the aggregating agent 56, the auxiliary agent 58, and the bark compost (fertilizer material) 78 on the laid slope 28 at the site 82. The resulting topsoil 12 is then mortar sprayed as shown in FIG.
Spraying and laying.

Next, the surface of the generated topsoil 12 laid on the slope 28 is covered with, for example, a seeded sheet 84 to which seeds of a predetermined plant are attached. The seeded sheet 84 is formed by adhering at least seeds of a woody plant to a naturally decomposable sheet. As the seeded sheet, for example, a cloth sheet disclosed in JP-A-09-041386 is used. Can be applied. In addition, the function, properties,
Since the selection criteria for the seeds to be attached and the like are the same as those of a known cloth sheet, descriptions of these points are omitted here.

The seeded sheet 84 used in the slope greening method of the present invention has a size and a shape corresponding to, for example, a frame partitioned by the concrete frame 80. Is arranged.

The slope including the seeded sheet 84
The 28 active areas are covered with a net 86 through which the trunk of the plant can pass, creating a greening base on which the plant can grow. Net 86
Is fixed, for example, by placing a main body driving type anchor 88 into the concrete frame 80.

Such a sheet 84 with seeds, a net 86
In the slope revegetation method of the present invention, which covers the topsoil 12 generated by
Is used as topsoil to reproduce the local vegetation ecology as close as possible to the original natural forest at the site, enabling greening on the slope 28 without discomfort between the site and the vicinity of the site, and reducing the amount of excavated soil waste Become more complex.

Further, the laying of the generated topsoil 12 on the slope 28 can be performed under spraying by the mortar spraying machine 10, so that the laying operation of the generated topsoil can be performed smoothly and easily.

Then, since the generated topsoil 12 laid inside the concrete frame 80 is covered with the sheet 84 with seeds and the net 86, the laying thickness on the steep slope which could not be easily obtained by ordinary thick-layer base material spraying work was obtained. It is possible to easily secure the increase and the reinforcement force of the green ground 32 against the slope 28, and the like.

The embodiments of the present invention described above are intended to explain the present invention, and do not limit the present invention in any way. Modifications, alterations, and the like made within the technical scope of the present invention are also possible. It goes without saying that all are included in the present invention.

[0051]

As described above, according to the method for conveying pneumatic surface soil of the slope greening method according to the present invention, a high-viscosity fractionated topsoil excavated and collected at or near the site is provided with a granulating agent, an auxiliary agent and By mixing the fertilizer into the generated topsoil, it is possible to convey the generated topsoil through the material hose of the spraying machine, thereby enabling utilization of the topsoil for the greening base.

As described above, if the local or nearby topsoil is used as a greening base, greening accompanied by the growth of the buried seeds contained in the topsoil can be obtained, so that the planting as close as possible to the original natural forest at the site is possible. The ecology can be reproduced, and the greening of the slope can be obtained without feeling uncomfortable with the local area and the local area.

Further, by using the topsoil generated by excavation at the site or the like as a greening base for the slope greening method, the amount of excavated soil to be discarded can be reduced. In other words, the reduction in the amount of excavated soil enables easy disposal and reduction of disposal cost.

Further, by using the topsoil at the site or the like as the generated topsoil, it is possible to increase the laying thickness by spraying. Therefore, it is possible to easily secure an increase in the reinforcing force of the green ground on the slope.

In the present invention, since the produced topsoil can be conveyed and sprayed with the material hose of the spraying machine without mixing the sand, sand is not present more than necessary on the greening base on the slope. . Therefore, it is possible to prevent a decrease in water retention and moisture retention on the greening base on the slope, and it is possible to surely improve the growth environment of the plants on the greening base using the topsoil collected at or near the site.

Further, since the lime-based auxiliary has a property of neutralizing the soil, if this lime-based auxiliary is used as an auxiliary to be mixed with the fractionated topsoil, the growth of useful microorganisms in the soil, By maintaining a soil environment suitable for breeding, it is possible to easily secure a generated topsoil suitable for germination and growth of plant organisms.

According to the slope greening method of the present invention, the generated topsoil is covered with the seeded sheet and the net.
The laying thickness of the greening base can be increased, thereby increasing the reinforcing power of the slope.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a mortar spraying machine in a topsoil pressure conveying method of a slope greening method according to the present invention.

FIG. 2 is a schematic process diagram from excavation and collection of topsoil to mixing of fertilizer materials (secondary mixing) in a method for transporting topsoil pressure in a slope greening method.

FIG. 3 is a schematic perspective view of a slope before laying a generated topsoil in the slope greening method according to the present invention.

FIG. 4 is a schematic vertical sectional view of a slope in the slope greening method.

[Explanation of symbols]

 10 Mortar spraying machine (spraying machine) 12 Generated topsoil 24 Material hose 26 Injection nozzle 28 Slope 32 Greening base (growth base) 41 Ground 42 Topsoil (digging topsoil) 48 Separated topsoil 56 Agglomerating agent 58 Auxiliary agent 63 Mixed topsoil 78 Fertilizer (bark compost) 82 Water retention net 84 Seat with seed 86 Net

(56) References JP-A-9-41386 (JP, A) JP-A-6-116561 (JP, A) JP-A 1-277425 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) E02D 17/20 102

Claims (4)

(57) [Claims] 1. A surface soil produced by mixing a suitable soil with a suitable fertilizer material is fed together with compressed air into a material hose of a spraying machine and conveyed through the hose, and under the pressure of the compressed air, In the method of greening the topsoil by the slope revegetation method, in which the generated topsoil can be sprayed on the slope by injection from the injection nozzle at the tip of the material hose, a stone larger than a specified size from the excavated topsoil secured and collected at or near the site Gravel and root system are removed to form a sorted topsoil, and the sorted topsoil is provided with a flocculating agent that promotes agglomeration of soil particles,
A slope characterized by mixing a predetermined auxiliary agent for strengthening and maintaining the aggregate structure of the soil particles, and further mixing at least a predetermined fertilizer material with the already mixed topsoil to form the generated topsoil. Top soil pressure air conveyance method of the greening method. 2. The method according to claim 1, wherein a lime-based auxiliary is mixed into the separated topsoil as the auxiliary. 3. The method of claim 1, wherein a cement-based auxiliary agent is mixed into the separated topsoil as the auxiliary agent. 4. Excavated topsoil collected and collected at or near the site to remove rubble and roots of a predetermined size or more from the excavated topsoil to form a fractionated topsoil, and the fractionating topsoil is used to promote the agglomeration of soil particles. When,
A predetermined auxiliary agent that strengthens and retains the aggregate structure of the soil particles is mixed with a predetermined fertilizer material, and the mixed soil is further mixed with a predetermined fertilizer material to form a generated topsoil. It is sent to the material hose and conveyed through the hose, and by spraying from the injection nozzle at the tip of the material hose under the pressure of this compressed air, the generated topsoil is sprayed on the slope and laid, and it can be naturally degraded A seeded sheet having at least the seeds of a woody plant adhered to the sheet covers the surface of the laid topsoil, and the effective area of the slope including the seeded sheet is allowed to pass through the net of the plant trunk. Slope revegetation method that can be further covered with a greening base on which plants can grow.