JP3295752B2 - 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 greening a slope using a vegetation base material mixed with a water retention material.

[0002]

2. Description of the Related Art There is generally known a method of greening a slope by spraying a vegetation base material mixed with seeds on the slope to form a vegetation base. From the viewpoint of maintaining a suitable greening environment, it is also known to mix a water retention material into a vegetation base material in order to improve the water holding (water retention) of the vegetation base. Water retention material is a polymer water absorbent such as a water absorbent polymer,
It has the property of absorbing and swelling water hundreds of times its own weight.

[0003]

The above-mentioned greening technology has the following problems. <A> The amount of water to be added to the vegetation base material is set low in consideration of the spraying workability, and the water retention material is sprayed in almost dry condition. For this reason, the water retention material absorbs water in the vegetation base material immediately after spraying or water supplied by rainfall or watering, and the seeds are not sufficiently rehydrated. Therefore, there is a problem that not only the seed germination rate is lowered and the germination day is easily delayed, but also the dry surface soil is scattered. <B> Since the vegetation base formed on the slope is compacted to about 1/2 compared to before spraying, sufficient swelling space of the water retention material is not secured inside the vegetation base. Since the amount of water absorbed by the water retaining material is limited by the swelling space, the original water retaining ability of the water retaining material has not been fully utilized conventionally. <C> When the aggregate is mixed into the vegetation base material, the sprayed aggregate bounces off the slope, so-called rebound loss occurs,
It is difficult to obtain the desired composition of the vegetation base.

The present invention has been made in view of the above points, and it is an object of the present invention to sufficiently exhibit the water retention performance of a swelling water retention material, improve water retention and improve germination and growth of plants. It is an object of the present invention to provide a revegetation method for a slope, which is capable of suppressing the rebound of aggregate and obtaining a vegetation base having a good composition.

[0005]

The invention according to claim 1 is
In the slope greening method of forming a vegetation base by spraying a vegetation base material on the slope, and vegetating on the vegetation base, it takes about 10 minutes.
Water absorption port that absorbs 200 to 400 times its own weight of water
This is a slope revegetation method characterized by mixing a limer with a vegetation base material and spraying it on the slope. The invention according to claim 2, vegetation base is formed on the slope by blowing the vegetation base material in which the air conveyed from the spray nozzle, the slope greening method for vegetation to the vegetation base, 200 times its own weight in about 10 minutes ~ 4
The water-absorbing polymer, which has absorbed water 00 times, is mixed with the vegetation base material in the vicinity of the spray nozzle and mixed therewith.
A slope greening method characterized by spraying a vegetation base material mixed with an aqueous polymer onto a slope. According to a third aspect of the present invention, in the slope greening method in which a vegetation base material conveyed by air is sprayed from a spray nozzle to form a vegetation base on a slope and vegetation is vegetated on the vegetation base, the water-absorbing polymer is applied for about 10 minutes.
After absorbing 200 to 400 times its own weight of water, the water- absorbing polymer obtained by separating excess water is mixed into a vegetation base material, and the vegetation base material mixed with the water-absorbing polymer is sprayed onto a spray nozzle. It is characterized by being transported and sprayed on the slope
It is a slope greening method. The invention according to claim 4, the vegetation base is formed on the slope by blowing the vegetation base material in which the air conveyed from the spray nozzle, the slope greening method for vegetation to the vegetation base, on a separate line, in about 10 minutes 200 times its own weight to 400
The water-absorbing polymer that has absorbed twice the amount of water is transported together with water and merges with the vegetation base material near the spray nozzle, and the water- absorbing polymer is absorbed.
This is a slope greening method characterized by spraying a vegetation base material mixed with a polymer onto the slope. A fifth aspect of the present invention is a slope greening method according to any one of the first to fourth aspects, wherein an aggregate is mixed into the vegetation base material. The invention according to claim 6 is
The slope greening method according to claim 5, wherein the aggregate has a grain size of 2 mm to 19 mm, and the aggregate is mixed in a range of 20% to 70% by volume of the vegetation base material. This is the slope greening method.

[0006]

Embodiment 1 An example of an embodiment of the present invention will be described below with reference to the drawings.

<A> Composition of Vegetation Base Material FIG. 1 shows a conceptual diagram of the greening method of the present invention. The present invention applies water 4 and binder 16 to the swelling water retention material 5 when spraying the vegetation base material 1 mainly composed of aggregate, organic soil improvement material, fertilizer and seed from the spray nozzle 2 to the slope 3. In addition, the swelling water retention material slurry 6 that has sufficiently absorbed water is sprayed together with the vegetation base material 1 to form the vegetation base 7.

<B> Swelling Water Retention Material The swelling water retention material 5 constituting the swelling water retention material slurry 6 can use a known water-absorbing polymer. As the water-absorbing polymer, a super-water-absorbing polymer that absorbs 200 to 400 times its own weight in about 10 minutes is preferable. For example, a water-insoluble polymer such as a starch-polyacrylonitrile-graft copolymer , Vinyl ester-ethylenically unsaturated carboxylic acid copolymer saponified product, self-crosslinked polyacrylic acid salt obtained by reversed phase suspension polymerization method, reaction product of polyvinyl alcohol polymer and cyclic acid anhydride, polyacryl A crosslinked acid salt, a vinyl alcohol / acrylate copolymer or the like can be used. The preferred particle size of the water-absorbing polymer is 5
The particle size is not limited.

Further, fine powders such as zeolite, perlite and vermiculite can be used as other auxiliary water retention materials.

In the present invention, when using any of the swelling water retention materials 5, it is important to sufficiently absorb water in advance. After mixing with sufficient water, the storage tank 11
For 10 to 30 minutes. In order to prevent sedimentation of the swelling water retention material 5 in the storage tank 11 and to prevent separation of the water retention material during transportation and excess water, a binding agent or bentonite described below can be used as a sedimentation preventive agent.

<C> Other composition materials In addition to naturally occurring aggregates such as gravel, aggregates include recycled asphalt, recycled concrete, plastic waste, and the like whose grain size has been adjusted.
Granules obtained by coagulating calcined ash generated as industrial waste can be used. Each of the above exemplified aggregates has a particle size of 2 mm.
A particle whose particle size has been adjusted to a range of １９19 mm, more preferably a range of 10 mm to 15 mm is used. The mixing ratio of the aggregate is preferably in the range of 20% to 70% by volume of the vegetation base material. If the content is less than 20%, the gas phase becomes too much, and it becomes easy to dry. If the content is more than 70%, the base becomes too hard to be suitable for vegetation. More preferably, in the range of 30% to 50%, a favorable three-phase distribution for plant growth can be realized.

The soil amendment is an organic material, for example, compost compost obtained by sufficiently fermenting and mature bark, peat moss, livestock dung, sewage sludge, and the like.

The binder is added for the purpose of preventing the vegetation base 7 from collapsing and eroding, and the sedimentation of the swelling water retention material 5 in the water storage tank 10. As the binder, for example, in addition to a polymeric binder, a plant starch-based, cement-based, or resin-based binder can also be used.

The fertilizer is, for example, an advanced chemical fertilizer that assists the growth after germination, and its components and the amount of the fertilizer are appropriately selected according to the type of seed.

The seeds are also appropriately selected in consideration of the construction environment, the purpose of vegetation, and the like, and are not limited to a single seed.

<C> Greening Method The vegetation base material 1 is prepared by charging a predetermined amount of each aggregate, organic soil improving material, fertilizer, seed, etc., stored in the storage tank 15 into the spraying machine 8,
The air is blown from the spraying machine 8 to the spraying nozzle 2 through the hose 9. In this case, the transportation of the vegetation base material 1 may be performed by either a wet air method in which water is added at the transportation source or a dry air method in which water is added near the tip nozzle 2.

The water 4, the swelling water-retaining material 5 and the binder are put into a stirring tank 10 provided with mixing means and stirred. The swelling water retention material 5 is sufficiently absorbed by water to obtain a swelling water retention material slurry 6. The binder disperses the swelling water retention material 5 and suppresses its sedimentation.
The swelling water retention material slurry 6 is supplied to the spray nozzle 2 via the storage tank 11 or directly from the stirring tank 10 via the hose 12. The vegetation base material 1 is sprayed from the spray nozzle 2 to the slope 3 together with the swelling water retention material slurry 6 to form a vegetation base 7 having a predetermined thickness.

The reason why the swelling water retention material slurry 6 is merged immediately before the spray nozzle 2 is to take the transportability of the vegetation base material 1 into consideration. That is, when the vegetation base material 1 and the swelling water retention material slurry 6 are pumped together, the water content of the vegetation base material 1 increases, and the vegetation base material 1 is blocked in the hose and cannot be pumped. In order to prevent such a blockage accident, the two were separately pumped by different routes and merged immediately before spraying.

Since the swelling water retention material 5 contained in the swelling water retention material slurry 6 sufficiently absorbs water, the vegetation base 7 is provided with high water retention. In addition, the swelling water retention material 5 that has sufficiently absorbed water functions as a cushioning material to suppress the rebound loss of the aggregate, and even if a considerable amount of aggregate is mixed, the elasticity of the base material makes the base hardness more than necessary. It works to prevent you from getting too high.

Conventionally, the water retention material in the vegetation base has been compacted by spraying, and a sufficient swelling space cannot be secured.
On the other hand, in the present invention, since the swelling water retention material 5 that has sufficiently absorbed water is sprayed, the problem of securing the swelling space of the swelling water retention material 5 does not occur. Rather, the elasticity of the swelling water retention material 5 prevents the vegetation base 7 from being compacted, thereby preventing the base hardness from becoming unnecessarily high.

In FIG. 1, 13 is a pump for pumping the swelling water retention material slurry 6, and 14 is a net material laid on the slope. The net member 14 is a member for suppressing the collapse of the vegetation base 7, and for example, a thick net material knitted with a wire net or a resin fiber can be used.

[0022]

EXAMPLES In order to prove the characteristics of the present invention, (1) a vegetation base material having the following composition was air-conveyed, and 1 part by weight of a water-absorbing polymer and 500 parts by weight of a water-based polymer were mixed with 500 parts by weight of water near a spray nozzle. The present invention in which 5 parts by weight of a binder is added, agitated and mixed, and a swelling water retention material slurry is combined and sprayed, and (2) a water-absorbing polymer in a dry state is added to a vegetation base material having the following composition and air is applied. A comparative test was conducted on the vegetation base and the vegetation condition sprayed and formed, respectively, in a comparative example in which a mixed solution composed of 5 parts by weight of a binder and 200 parts by weight of water were combined and sprayed near the spray nozzle. Was. The average particle size is 500 μm as a water-absorbing polymer
And a high-moisture having a water absorption of 300 g / g (manufactured by Himo Co., Ltd.).

[Composition of base material] Bark compost: 255 parts by weight Peat moss: 188 parts by weight Recycled asphalt aggregate: 1380 parts by weight Fertilizer: 4 parts by weight Seed: 0.1 parts by weight

[Blending of swelling water retention material slurry (per batch)] The water-absorbing polymer 10 was added to 50 L (liter) of water.
Then, 0 g and 500 g of a binder were added and stirred and mixed to obtain a swelled water retention material slurry. Since the water absorption of the water-absorbing polymer is 300 g / g, about 20 L remains as excess water. In the comparative example, about 20 L of water was merged with a vegetation base material mixed with 100 g of a water-absorbing polymer in a dry state in the vicinity of a spray nozzle to perform a test.

[Seed composition] Seed type and seeding rate (g / m
3) is as follows. Orchard grass: 11 g / m3 Creeping red festival: 24 g / m3 Medhagi: 98 g / m3 Itachihagi: 442 g / m3 Yamahagi: 492 g / m3 Total 1067 g / m3

Then, 1 kg /
The vegetation base material of the comparative example to which m3 was added and the swelling water retention material were 50
A vegetation base material added at 0 kg / m3 was sprayed, and a comparison test was performed on the rebound loss rate, base hardness, germination days, germination number, and plant height of both asphalt waste materials (aggregates).

FIG. 2 shows the test results. According to the test results, the vegetation base material of the present invention in which the water-absorbing polymer sufficiently absorbed water was mixed, compared with the comparative example in which the water-absorbing polymer in a dry state was mixed, compared with the rebound loss of aggregate. It was proved that the rate, base hardness, germination days, germination number and plant height were all excellent.

[0028]

[Embodiment 2] As a mixed form of the swelling water retention material slurry 6, in addition to that shown in Embodiment 1 (FIG. 1),
For example, after absorbing sufficient water, a swelling water retention material obtained by separating excess water is mixed in advance with a vegetation base material, and the vegetation base material is air-conveyed to a spray nozzle, while water or water is separated by another system. A mixed solution of water and a binder may be conveyed to a spray nozzle, and both may be combined and sprayed on a slope.

[0029]

[Embodiment 3] In the above-described embodiment, the case where the aggregate made of the recycled asphalt is mixed into the vegetation base material is exemplified. However, in the present invention, the aggregate other than the recycled asphalt can be used. is there. In addition, the present invention does not necessarily require mixing of the aggregate into the vegetation base material, and may omit the mixing of the aggregate.

[0030]

The present invention has the following unique effects. <B> Because a water-swelling material that has been sufficiently absorbed in advance is used, the water-holding performance of the base is significantly improved compared to the conventional technology using a water-holding material in a dry (powder) state. Can be supplied. Furthermore, since the swelling water retention material interposed between the solid particles functions as a buffer, it is possible to effectively prevent the base hardness from becoming unnecessarily high. <B> Since the swelling water retention material absorbs water sufficiently, the vegetation base after spraying does not need to be dried, and the problem that the surface soil of the vegetation base is scattered can be avoided. <C> When the aggregate is mixed into the vegetation base material, the swelling water retention material that has sufficiently absorbed water functions as a buffer material, so that the rebound loss of the aggregate can be significantly reduced. <D> Normally, the water retention deteriorates when the aggregate is mixed into the vegetation base material.However, by mixing the swelling water retention material that has sufficiently absorbed water, the problem of the water retention deterioration can be solved, and the base hardness decreases. As a result, it is possible to obtain a thick-layer base having a composition suitable for vegetation that maximizes the advantages of the aggregates, such as improved root growth and closerness to natural soil.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of the greening method of the present invention.

FIG. 2 is an explanatory diagram of a characteristic test result in a comparative example (conventional example) in which a powdery water-absorbing polymer is added by drying and a vegetation base material (invention) in which water is added.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Vegetation base material 2 ... Spray nozzle 3 ... Slope 4 ... Water 5 ... Swelling water retention material slurry 6 ... Swelling water retention material slurry 7 ... Vegetation base 8 ... Spraying machine 9 ... Vegetation base material conveyance Hose 10 for agitation tank 11 Storage tank 12 Hose for swelling water retention material slurry transport 13 Pump for swelling water retention material slurry transport 14 Net material 15 Storage tank 16 Binder

Continuation of the front page (56) References JP-A-63-277321 (JP, A) JP-A-8-260469 (JP, A) JP-A-6-173271 (JP, A) JP-A-4-194119 (JP) JP-A-4-247121 (JP, A) JP-A-5-247943 (JP, A) JP-A-4-330226 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB (Name) E02D 17/20 102

Claims (6)

(57) [Claims] 1. A vegetation base material by blowing the slopes forming the vegetation base in slope greening method for vegetation to the vegetation base, suction 200 times to 400 times of water to its own weight in about 10 minutes
The slope revegetation method characterized by mixing the collected water-absorbing polymer with the vegetation base material and spraying it on the slope. 2. A vegetation base is formed on the slope by blowing the vegetation base material in which the air conveyed from the spray nozzle, the slope greening method for vegetation to the vegetation base, of its own weight in about 10 minutes 20
The water-absorbing polymer having absorbed water of 0 to 400 times is mixed and mixed with the vegetation base material near the spray nozzle, and the vegetation base material mixed with the water-absorbing polymer is sprayed on a slope. Characterized by the slope greening method. The 3. A vegetation base material in which the air transporting the vegetation base is formed on the slope by blowing from spray nozzles, the slope greening method for vegetation to the vegetation base, 10 minutes to the water-absorbing polymer
After absorbing 200 to 400 times its own weight of water, the water- absorbing polymer obtained by separating excess water is mixed into a vegetation base material, and the vegetation base material mixed with the water-absorbing polymer is sprayed with a nozzle. A method of greening slopes, which is transported to the slope and sprayed on the slopes. 4. A vegetation base is formed on the slope by blowing the vegetation base material in which the air conveyed from the spray nozzle, the slope greening method for vegetation to the vegetation base, on a separate line, in about 10 minutes
Water absorption port that absorbs 200 to 400 times its own weight of water
Vegetation base material near the spray nozzle by transporting the rimer with water
And spraying the vegetation base material mixed with the water-absorbing polymer onto a slope. 5. The slope greening method according to claim 1, wherein an aggregate is mixed into the vegetation base material. 6. The slope greening method according to claim 5, wherein the aggregate has a particle size of 2 mm to 19 mm, and the aggregate has a volume ratio of 20% to 70% of the vegetation base material. A slope revegetation method characterized by mixing.