JPH11137076A - Filling slurry for plant cultivation bed and its filling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject slurry applicable to a void part of a porous formed material used for greening of a slope, the rooftop or a wall surface or the like and maintaining the water holding properties for a long period without carrying out the watering under dried conditions for a long period by dispersing a humus or a clayey powder reactive with the humus and producing a get in water. SOLUTION: This slurry is filled in a void part of a porous formed material and is obtained by dispersing a humus or a clayey powder reactive with the humus and producing a gel in water. The concentration of the humus is preferably 2-4.5 wt.% based on bone-dry weight. The compounding ratio of the clayey powder reactive with the humus and producing the gel is preferably 2-12 wt.%. The humus is preferably peat moss. Furthermore, the clayey powder reactive with the humus and producing the get is preferably bentonite.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filling slurry for a plant cultivation base having a function of improving a plant growing environment in a void of a porous molded body, and a method for filling the same. Or, it is applied to greening of walls and the like.

[0002]

2. Description of the Related Art In general, a greening method for a rooftop of a building or a green belt belt of a road is a method of placing potted plants, or a method of artificially creating a material close to natural soil and planting various kinds of plants in the method. However, the range of greening is limited,
A method of providing a light and thin planting bed and replenishing the plants with water from the bottom surface using capillary action has been adopted. On the other hand, the present applicants have developed various greening bases represented by porous concrete in order to construct greening landscapes such as roads and slopes of buildings with more practical construction methods, and have further developed various types of greening bases. It has also been proposed to fill a water retention material in order to enhance planting suitability (Japanese Patent Laid-Open Nos. 6-228965 and 6-22).
No. 8966, JP-A-6-228967, JP-A-7-170850, JP-A-8-105052, JP-A-8-109636,
JP-A-8-109637).

For example, a method of pouring a large amount of a slurry-like water retention material of unadjusted viscosity, particle size and concentration into the voids of a porous molded body is poured into concrete voids. However, there is a problem that the water retention material is not economical in view of the above, or the water retention material gets caught in the middle of the gap, the slurry does not enter the gap, and flows down to the outside to completely fill the gap.

[0004] In addition, in a plant cultivation base made of porous concrete filled with a water retaining material, even if drying for a long period of time continues, in order to grow the planted plant in a healthy manner, it is necessary to fill the water retaining material filled in the void. It is required that the amount of the material is sufficiently ensured and that the material has a water retaining ability. However, it is extremely difficult to solve this problem, and there has not yet been provided a material that is sufficiently satisfactory.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to apply the present invention to the voids of a porous molded article used for greening slopes, rooftops and walls, etc. Even without performing spearing, it is possible to provide a filling slurry for a plant cultivation base and a filling method thereof, which can maintain water retention for a long period of time and are suitable for healthy growth of plants excellent in reabsorption performance after drying. is there.

[0006]

Under such circumstances, the present inventors have conducted intensive studies and as a result, of organic or inorganic short fibers or powders, humic substances or clays which react with humic substances to form gels. It has been found that a slurry obtained by dispersing high-quality powder in water can solve the above problems, and has completed the present invention.

[0007] That is, the present invention is a slurry to be filled in the voids of a porous molded body, characterized in that humic substances or clay-like powder which reacts with humic substances to form a gel is dispersed in water. The present invention provides a filled slurry for plant cultivation bases.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The plant cultivation base to be filled with the slurry of the present invention is a porous formed body having continuous voids.
Examples of the porous molded body include, but are not particularly limited to, concrete for greening base having continuous voids between aggregates, porous glass made of ceramics, porous resin molded body made of polymer, sponge, and the like. Among them, concrete for greening base is particularly preferable.

As the concrete for greening base, for example, those disclosed in JP-A-6-228965, JP-A-6-228966 and JP-A-6-228967 can be used. The concrete for greening base is preferably a porous body obtained by solidifying aggregate with a cement binder.
Examples of the aggregate include natural crushed stone such as crushed stone, assite, and volcanic rock, blast furnace slag, industrial waste such as refractory, and artificial aggregate, and are used as one or a mixture of two or more of these. You. Further, an aggregate obtained by fusing glass with glass can also be used. The particle size of the aggregate is not particularly limited, but is preferably in the range of about 5 mm to 40 mm.

[0010] The cement binder is a cement for cement paste or mortar, and preferably has a small amount of alkaline components dissolved therein. Specific examples include mixed cement in which fine powder such as blast furnace slag, fly ash, irwin, and silica is mixed with Portland cement or phosphate cement.

As the porous glass, it is preferable to use a base disclosed in Japanese Patent Application Laid-Open No. 7-170850. Specifically, a water retention material having a melting point higher than that of glass is added, and the glass is heated and fired. The particles are surface fused.

Examples of the porous resin molded article and sponge made of a polymer include polyester, polypropylene, polystyrene, and polyurethane foam.

The porosity of the greening concrete is 2
0 vol% or more is preferable, and 25 to 35 vol% is particularly preferable. The porosity is designed in relation to the size of the aggregate and the ratio of cement to aggregate, but if the porosity is too small, the adaptability to planting is reduced. If the porosity is too large, the strength is reduced, which is not preferable.

The slurry of the present invention is intended to improve the environment of the plant by filling the pores of the plant cultivation base, and disperse the humic substance or clay-like powder which reacts with the humic substance to form a gel in water. It is a slurry.

The humic substance is not particularly limited as long as it has humic acid. Examples thereof include humic acid, nitrohumic acid, ammonium humate, calcium humate, magnesium huminate, ammonium nitrohumate, calcium nitrohumate, and magnesium nitrohumate. Humic acids or humic acid compounds and short fibers containing humic substances such as peat moss. Among them, peat moss is industrially preferable. Humic substances can be used alone or in combination
More than one species can be used in combination. Further, the blending ratio of the humic substance is preferably from 2 to 4.5% by weight in the slurry on a dry basis.

The clayey powder that reacts with the humic substance to form a gel is not particularly limited, but bentonite is preferred because of its excellent re-absorption performance after drying. Further, by causing the gelation, the viscosity of the slurry is finely adjusted, and it is easy to inject the slurry into the plant cultivation base, which is preferable. The mixing ratio of the clay powder is as follows:
It is preferably from 2 to 12% by weight, particularly preferably from 3 to 9% by weight.

In the present invention, the humic substance and the clay powder which reacts with the humic substance to form a gel may be a humic substance alone, a clay powder alone, or a mixture of both. .

The filled slurry for plant cultivation base of the present invention comprises:
Organic or inorganic short fibers or powders other than the above essential components can be blended. The organic or inorganic short fibers are not particularly limited, but include, for example, organic fibers such as bagasse, bark, pulp, wool, silk, leather, polyethylene, polypropylene, nylon, Saran, and vinylon, slag fibers, wollastonite, and sepiolite. And the like. Of these, bagasse is preferable. The organic or inorganic short fibers can be used alone or in combination of two or more. Further, the concentration of the total organic or inorganic fiber to be blended in the present invention is preferably in the range of 2 to 4.5% by weight on a dry basis in the slurry.

The humic substance and the short fibers have a fiber length of at least 1/3 or more of the average void diameter of the porous molded article of 5% by weight or less in the short fibers, and have an average void diameter of 5% or less. 1 /
It is preferable to use those in the range of 12 to 1/6 by 20% by weight or more. Further, the number average diameter of the humic substance and the short fiber is in the range of 100 μm to 1/12 of the average void diameter, and particularly preferably in the range of 150 μm to 500 μm, as measured by laser scattering type viscosity measurement (Microtrack).

Here, the average void diameter is the average diameter of the voids of the porous molded body. As the measuring method,
Although not particularly limited, for example, each surface of the porous molded body obtained by cutting a block-shaped surface of the porous molded body or a large molded body partially cut into an appropriately sized block is charcoal, water-based paint, or pencil. And then press paper or the like against the surface, and then apply a method such as the model diagram shown in FIG.
There is a method of measuring the void portion to determine the average diameter of the void. That is, in FIG. 1, the gap diameter of the gap 1 is X
₁ = (a ₁ + b ₁ ) / 2, and similarly, the gap 2 is X ₂
= (A ₂ + b ₂ ) / 2, and the gap 3 is X ₃ = (a ₃ +
b ₃ ) / 2, the gap 4 is determined by X ₄ = (a ₄ + b ₄ ) / 2, and the gap 5 is determined by X ₅ = (a ₅ + b ₅ ) / 2. If this is determined for as many voids as possible, the average void diameter will be X = (X ₁ + X ₂ + X ₃ +... X _n ) / n.

The organic or inorganic powder is not particularly limited, but may be an organic powder such as urethane, styrene, polyethylene, or polypropylene;
Examples include expanded particles such as pearlite, Kanuma soil, other general soil particles, and mineral powders such as calcined vermiculite. Among them, one type can be used alone, or two or more types can be used in combination. It is preferable that the longest diameter of the powder is 1/4 or less, preferably 1/6 or less of the average void diameter.

The slurry of the present invention is prepared by mixing the humic substance to be used and the amount of the clay-like powder which reacts with the humic substance to cause gelation, and the amount of other short fibers and powder depending on the average pore diameter of the porous compact to be filled. The shape is determined. The average pore size varies depending on the particle size of the aggregate used for the porous molded body and the like, and the type thereof does not have a certain size because it varies depending on the place, environment, and the like at the time of enforcement. For this reason, when filling more efficiently, the porous molded body to be filled is determined in advance,
Based on this, it is preferable to determine the shape of the short fiber or the like to be used, and then to prepare a slurry.

The concentration of the slurry of the present invention is 2 to 20% by weight, preferably 2 to 16% by weight in terms of solids.

In preparing the slurry, thickeners such as polyacrylamide, CMC, MC, gums, and silica sol can be used to increase the viscosity. Good. Further, if necessary, a slow-release fertilizer can be added. As the slow release fertilizer, for example, Mag Amp K (manufactured by Hyponex Japan), Green Map Powder (manufactured by Nippon Godo Fertilizer) and the like, and other siliceous fertilizers such as soluble phosphorus manure powder and slag And the like.

The method for injecting the filled slurry of the present invention is not particularly limited, but the slurry prepared as described above is passed through a porous plant cultivation base through a liquid feed pump, and is sprayed from above using a sprinkler or the like. What is necessary is just to inject by spraying or pouring.

The plant cultivation base (porous molded body) of the present invention
Is applicable to greening slopes, rooftops, wall surfaces, and the like, and is also applicable to greening ground planes such as parking lots.

[0027]

The filling slurry of the present invention uses a humic substance or a clay powder which reacts with the humic substance to form a gel, so that it can be adjusted to an appropriate slurry viscosity which can be conveniently injected into a porous plant cultivation base. Therefore, if the slurry is injected into a plant cultivation base such as concrete for a greening base, not only the injection loss of the slurry is reduced, but also the slurry can be continuously filled without being clogged in the middle of the continuous pores. In addition, the yield inside the void is good, and the surroundings are not stained by the outflow slurry. In addition, under long-term drying, water retention can be maintained for a long time without watering, and the plant growth environment in the pores can be improved because of excellent re-absorption performance after drying. .

[0028]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. Example 1 Peat moss pulverized to 2 mm or less was added to water to prepare slurries of 3% and 4% of peat moss in absolutely dry concentration. Bentonite was added to this slurry in various proportions shown in Table 1 with respect to the weight of the slurry to prepare various slurries. Next, a nonwoven fabric was applied to the lower part of a porous concrete having a porosity of 30% using No. 5 crushed stone as a coarse aggregate, and the slurry was poured from above and poured. After the pouring, the porous concrete was cut to check the state of filling, and it was found that the porous concrete was almost uniformly filled from top to bottom. In addition, the water retention and re-absorption of the various slurries were evaluated by the following methods. Table 1 shows the results.

(Water retention of slurry) The slurry is put into a non-woven bag and dehydrated all day and night. The dehydrated sample is placed in a filter tube of a soil moisture meter, centrifugally dehydrated, and pF1.8 to
Determine the water content (g / l) available for plants in the range of 3.0.
"PF" is a logarithmic value of a water column height corresponding to a suction pressure, and indicates an index of water retention by centrifugal method or suction method of water in soil. The water content of pF 1.8 to 3.0 is Means water that can be used effectively by plants. The detailed measuring method was based on the method described in "Soil Physical Measurement Method" edited by Soil Physical Property Measurement Committee, Yokendo Co., Ltd., April 10, 1972, pages 134 to 159.

(Resorptivity of slurry) The slurry is put into a non-woven bag and dehydrated all day and night. After packing the dehydrated sample in a hot pot and placing it under the scorching sun for 20 days and drying it sufficiently,
Water was sprinkled from above and the re-absorption was evaluated according to the following criteria. Water that repels water when sprayed from the top and plays back ... × Plays at the beginning but starts absorbing water immediately ... ○ Starts absorbing water immediately without playing from the beginning .. ◎

[0031]

[Table 1]

[0032]

[Table 2]

As is clear from Tables 1 and 2, peat moss or bentonite retains a sufficient amount of water for plant growth even after the water is drained. Further, those having an added amount of bentonite of 3.0% by weight or more are particularly excellent in re-absorption of water, and thus are preferable.

Example 2 Using peat moss pulverized to 2 mm or less, an absolute dry concentration of 1.5,
Peat moss slurries of 2.8, 3.6, 4.0, 4.5 and 5.0% were prepared, and a predetermined amount of bentonite shown in Tables 3 to 8 was added to the slurry to obtain a slurry for spraying or pouring. This slurry was poured by pouring from the upper part of a porous concrete (continuous porous hardened body having a diameter of 100 mm, a height of 150 mm and a porosity of 30%) using No. 5 crushed stone as a coarse aggregate, and the filling amount of peat moss and bentonite was measured. I asked.
The results are shown in Tables 3 to 8. The filling amount was determined by the following method.

(Measurement Method of Filling Amount) The slurry liquid is poured at a constant speed from above the continuous porous hardened material by using a pump, and the time when the slurry overflows the surface of the hardened material is regarded as the end of the injection. The filling amount was determined by measuring the amounts of peat moss and bentonite in the poured slurry and the slurry flowing out of the cured product, respectively.

[0036]

[Table 3]

[0037]

[Table 4]

[0038]

[Table 5]

[0039]

[Table 6]

[0040]

[Table 7]

[0041]

[Table 8]

As is clear from Tables 3 to 8, all of the present examples are filled with a sufficient amount of peat moss and bentonite, and are excellent in water retention.

[Brief description of the drawings]

FIG. 1 shows a model diagram for obtaining an average pore diameter of a porous molded body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gap part 1 2 Gap part 2 10 Aggregate 11 Gap part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Eiichi Handa 9-15-1, Kameido, Koto-ku, Tokyo Nippon Kagaku Kogyo Co., Ltd. Research and Development Division (72) Kunio Hisamatsu 9-15 Kameido, Koto-ku, Tokyo No. 1 Nippon Kagaku Kogyo Co., Ltd. Research and Development Headquarters (72) Inventor Takahiro Nishida 9-15-1, Kameido, Koto-ku, Tokyo Nippon Kagaku Kogyo Co., Ltd. Research and Development Headquarters (72) Inventor Toshio Yonezawa Chiba 1-5-1, Otsuka, Inzai City, Japan Takenaka Corporation Technical Research Institute (72) Inventor: Mamoru Sakuma 1-5-1, Otsuka, Inzai City, Chiba Pref. 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside the Technical Research Institute, Takenaka Corporation (72) Inventor Atsushi Mizutani 1-5-5 Otsuka, Inzai City, Chiba Prefecture Ground 1 Inside the Takenaka Corporation Technical Research Institute (72) Inventor Toshiaki Yamada 8-21-1, Ginza, Chuo-ku, Tokyo Tokyo, Japan (72) Inventor Norihiko Adachi 8-21 Ginza, Chuo-ku, Tokyo No. 1 Takenaka Civil Engineering Co., Ltd. (72) Inventor Shinichiro Ando 8-21-1, Ginza, Chuo-ku, Tokyo Mitsui Taniguchi Inventor Mizuo Taniguchi 590-1 Takao, Tsuyama-shi, Okayama Japan Vegetation Co., Ltd. (72) Inventor Daisuke Toyohara 590-1 Takao, Tsuyama City, Okayama Prefecture Japan Vegetation Co., Ltd.

Claims (7)

[Claims] 1. A plant cultivation base, characterized by dispersing in water water a slurry to be filled in voids of a porous molded body, wherein the slurry is a humic substance or a clay powder that reacts with the humic substance to form a gel. For filling slurry. 2. The humic substance concentration is 2-4.
The filling slurry for a plant cultivation base according to claim 1, which is 5% by weight. 3. The compounding ratio of the clayey powder which reacts with the humic substance to form a gel is 2 to 12% by weight.
Or the filling slurry for plant cultivation bases according to 2. 4. The filling slurry for a plant cultivation base according to claim 1, wherein the humic substance is peat moss. 5. The filling slurry for a plant cultivation base according to claim 1, wherein the clayey powder which reacts with the humic substance to form a gel is bentonite. 6. The filling slurry for a plant cultivation base according to claim 1, wherein the slurry has a concentration of the slurry of 2 to 20% by weight in terms of solid matter. 7. A method for filling a filling slurry for a plant cultivation base, comprising filling the filling slurry for a plant cultivation base according to claim 1 from above the porous molded body using a pump or the like.