JPH1132572A - Filling slurry for plant cultivation base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a filling slurry for a plant cultivation base, capable of retaining the water holding properties for a long period and suitable for sound growth of plants by dispersing short fibers such as organic ones in water and regulating the viscosity within a prescribed range. SOLUTION: This filling slurry for a plant cultivation base is used for filling a void part of a porous formed product applicable to greening of a slope, the roof, a wall surface, etc., and is a slurry obtained by dispersing organic short fibers such as peat moss or inorganic fibers such as stag fibers or a powder in water (at a concentration of preferably 1-50 wt.% expressed in terms of the solid material). The slurry has a passage time of 500 mL according to the measurement of the funnel viscosity within the range of 20-45 sec. The short fibers preferably comprise >=5 wt.% fibers having the short fiber length of >=1/3 of the void average diameter of the porous formed product, >=20 wt.% fibers having the short fiber length within the range of (1/12) to (1/6) of the void average diameter and have the average individual diameter of the short fibers within the range of 100 μm to (1/2) of the void average diameter according to a laser scattering type grain size measurement in the short fibers and the powder preferably has the powder maximal diameter of <=1/4 of the void average diameter.

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 used for greening a slope, a roof or a wall surface. is there.

[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,
There is known a method of providing a light and thin planting bed and replenishing the plants with water from the bottom by utilizing the capillary phenomenon. 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. In order to further improve the suitability for planting, it has also been proposed to fill a water retention material (Japanese Patent Application Laid-Open Nos. 6-228965 and 6-228965).
JP-A-6-228966, JP-A-6-228967, JP-A-7-1708
No. 50, 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. There is a problem that it is not economical or that the water retention material is caught in the middle of the gap, so that the slurry does not enter the gap, flows down to the outside, and cannot sufficiently 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 easily and satisfactorily inject into a cavity of a porous molded body used for greening a slope, a roof, and a wall.
An object of the present invention is to provide a filling slurry for a plant cultivation base suitable for healthy growth of plants, which can maintain water retention for a long period of time without watering when dried for a long time.

[0006]

Under these circumstances, the present inventors have conducted intensive studies and as a result, have found that a slurry in which organic or inorganic short fibers or powders are dispersed in water has a specific viscosity or a short viscosity. The present inventors have found that a fiber or powder having a specific shape in relation to the average pore diameter of the base porous molded body can solve the above-mentioned problems, and have completed the present invention. That is, the present invention is a slurry in which organic or inorganic short fibers or powders are dispersed in water to fill the voids of a porous molded body applicable to greening of a slope, a roof or a wall surface, and the like. The present invention provides a filling slurry for plant cultivation bases, wherein the slurry has a passage time of 500 ml measured by funnel viscosity in a range of 20 to 45 seconds.

[0007]

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 a 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.

[0009] The cement binder is a cement for cement paste or mortar, and it is preferable that the binder dissolves little alkali component. 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 substrate 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.

[0012] 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 used to fill the pores of the plant cultivation base to improve the environment of the plant, and is a slurry obtained by dispersing organic or inorganic short fibers or powder in water.

The organic or inorganic short fibers are not particularly limited, but include, for example, peat moss, bagasse, bark,
Organic fibers such as pulp, wool, silk, leather, polyethylene, polypropylene, nylon, Saran, vinylon, etc.
Examples include inorganic fibers such as slag fibers, wollastonite, and sepiolite, and among them, peat moss and bagasse are preferable. Among them, one kind or a combination of two or more kinds can be used.

[0015] Among the short fibers, those having a fiber length of 1/3 or more of the average void size of the porous molded body are 5% by weight or less and 1/12 of the average void size of the porous molded body. ~ 1/6
It is preferable to use those having a range of 20% by weight or more. Further, the number average diameter of the short fibers is in the range of 100 μm to 1/12 of the average void diameter, as measured by laser scattering viscosity measurement (microtrack), particularly 150 μm to 500 μm.
The range of μm is preferred.

Here, the average pore diameter means the average diameter of the voids of the porous molded body applicable to greening of a slope, a roof or a wall surface. The measuring method is not particularly limited, but, for example, a block-shaped surface of the porous molded body or, if it is a large molded body, a part of the porous molded body cut into a block of an appropriate size. After painting with charcoal, water-based paint or pencil, press paper or the like against the surface,
A method of determining the average diameter of the gap by measuring the gap portion by a method as shown in the model diagram shown in FIG. 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, the gap 3 is X ₃ = (a ₃ + b ₃ ) / 2, the gap 4 is X ₄ = (a ₄ + b ₄ ) / 2, and the gap 5 is X ₅ =
(A ₅ + b ₅ ) / 2. If this is obtained for as many voids as possible, the average void diameter is X = (X ₁
+ X ₂ + X ₃ +... X _n ) / n.

Further, as the organic or inorganic powder,
Although not particularly limited, organic powders such as urethane, styrene, polyethylene, and polypropylene, expanded particles such as calcined shale, perlite, and mineral powders such as Kanuma soil, soil particles, and calcined vermiculite can be used. this house,
One type or a combination of two or more types can be used.

The longest diameter of the powder is 1/1 / the average diameter of the voids.
It is preferably 4 or less, and more preferably 1/6 or less.

The shapes of the short fibers and the powder used in the slurry of the present invention are preferably in the specific ranges as described above. The reason is that the shapes obtained based on many experimental results of the present inventors have been obtained. However, if the value exceeds this range, the filling rate into the porous voids, in other words, the yield inside the voids tends to be extremely reduced.

In the slurry of the present invention, the shapes of the short fibers and the powder to be used are determined by the average pore diameter of the porous compact to be filled. 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, it is preferable to preliminarily determine the porous molded body to be filled, determine the shape of the short fiber or the like to be used based on this, and then prepare a slurry.

The slurry of the present invention has a passing time of 500 ml measured by funnel viscosity in the range of 20 to 45 seconds. The concentration of the slurry is 1 to 50% by weight, preferably 2 to 10% by weight in terms of solids.

The slurry of the present invention preferably has a degree of dispersion in which the settled volume of the slurry portion after 2 hours is 70% or more and the settled volume of the slurry portion after 1 week is 30% or more. Here, the sedimentation volume of the slurry portion means that a slurry sufficiently stirred in water is placed in a container such as a 1-liter cylinder, and the total volume is set to 100%.
The ratio of the settled volume portion of the slurry after 2 hours and 1 week. That is, the slurry of the present invention has a very high dispersibility.

In preparing the slurry, a thickener such as polyacrylamide, CMC, MC, gums, or 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 may be injected into a porous plant cultivation base through a liquid feed pump using a water sprinkler or the like. I just need.

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

[0026]

When the filling slurry of the present invention is poured into a plant cultivation base such as concrete for greening base, not only is the injection loss of the slurry small, but also it is continuously filled without being clogged in the middle of the continuous pores. It becomes possible. In addition, since a sufficient amount of filler can be secured inside the continuous pores, water retention is improved, and the plant has a function of improving the environment for growing plants in the pores.

[0027]

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 was pulverized to obtain 0.2% by weight of short fibers having a fiber length of 1.7 mm or more and 27% by weight of short fibers having a fiber length in a range of 0.42 mm to 0.84 mm. The number average diameter of the short fibers by a laser method was 170 μm. Using the peat moss and water, a slurry having a 3% absolute solid content was prepared. To 1,000 g of this slurry, 0.1 g of a polyacrylamide-based anionic coagulant was added to increase the viscosity,
A spinnable slurry was used. The passage time of 500 ml of this slurry measured by funnel viscosity was 32 seconds. When the sedimentation volume was examined, it was 92% after 2 hours and 72% after 1 week. Next, a non-woven fabric was applied to the lower part of a porous compact formed by using cement paste as a binder by using No. 5 crushed stone as an aggregate, and the slurry was poured from above and poured. After the injection, the porous molded body was cut to check the filling state. As a result, it was found that the porous molded body was almost uniformly filled from top to bottom. In addition, the average pore diameter of the porous molded body was about 5 mm.

Example 2 Using the peat moss used in Example 1, an absolute dry solid concentration of 4
% Slurry was prepared. A polyacrylamide-based anionic coagulant was added to the slurry to increase the funnel viscosity (500 ml) to 38 seconds. The sedimentation volume was determined to be 97% after 2 hours and 80% after 1 week. This slurry was poured into the same porous molded body as used in Example 1 and poured from above. After the injection, the porous molded body was cut to check the filling state, and it was found that the porous molded body was homogeneously filled from the top to the bottom.

Example 3 3% by weight of a fiber having a fiber length of 1.7 mm or more was added in an amount of 0.3% by weight.
Pulverized peat moss in the range of 42-0.84 mm, 22% by weight, was added to water along with 0.5% of dispersant xanthan gum to prepare a slurry with a 5% absolute dry solids concentration. The funnel viscosity (500 ml) of this slurry was 43 seconds. The sedimentation volume was determined to be 100% after 2 hours and 95% after 1 week. This slurry was poured into the same porous molded body as used in Example 1 from above and poured. After the injection, the porous molded body was cut to check the filling state, and it was found that the porous molded body was almost uniformly filled from top to bottom.

Example 4 To 1,000 g of the slurry of Example 1, 2.5 g of slow-release fertilizer MagAmp K (manufactured by Hyponex Japan) prepared to have a longest diameter of 0.5 mm was added. This was injected into the same porous molded body as in Example 1, and after the injection, the porous molded body was cut to check the filling state.

Example 5 20% of Kanuma soil and 10% of field soil sieved with 0.5 mm were combined and added to water to prepare a soil component slurry having a solid concentration of 30%. Funnel viscosity of this slurry (500ml)
Was 21 seconds. The sedimentation volume was determined to be 72% after 2 hours and 37% after 1 week. This slurry was injected into the same porous molded body as in Example 1. After the injection, the porous molded body was cut and the state of filling was examined.

Example 6 A 15 mm diameter polypropylene ball was coated with an epoxy resin for resin concrete, packed in a box, solidified and adhered, and then the box was broken to obtain a resinous plant cultivation base.
When this base was filled with the slurry used in Example 1, it leaked from the bottom. When the lower portion was filled with the nonwoven fabric, the slurry was filled with a slurry having a porosity of about 1.0 times.
The average pore size of the porous molded body was 6.5 mm.
In this case, the peat moss having a fiber length of 2.2 mm or more was 2.8% by weight, and the one having a fiber length in the range of 0.54 to 1.1 mm was 32% by weight. As for the porosity, the side and bottom of the porous molded body are wrapped with a polyethylene sheet and filled with water. The porosity was calculated using the amount of water as the void volume.

Example 7 A bark was wet-pulverized to 1 mm or less to adjust the concentration, thereby obtaining a slurry having an absolutely dry solid concentration of 3.5% by weight. To this slurry, foamed pearlite pulverized to 1 mm or less was added at a ratio of 1% by weight. A polyacrylamide-based anionic coagulant was added to this slurry to prepare a funnel viscosity (50
0 ml) was prepared at 35 seconds. The settled volume of the slurry after 2 hours was 80%, and the settled volume of the slurry after 1 week was 68%. This slurry was poured into a porous compact formed using cement as a binder with the use of No. 5 crushed stone in the same manner as in Example 1, and the state of filling was examined in the same manner as in Example 1. It had been. The average void size of the porous molded body was 5.3 mm. In this case, the bark had a fiber length of 1.8 mm or more, 1.8% by weight, and those having a fiber length in the range of 0.44 to 0.88 mm were 60% by weight.

Comparative Example 1 Peat moss was pulverized, and 25% by weight of fiber length 1.8 mm or more, 15% by weight of 0.46 mm to 0.92 mm.
Was obtained. The number average particle diameter of the short fibers measured by a laser method was 600 μm. Using such peat moss, a slurry having an absolutely dry solid concentration of 5% by weight was prepared. To 1,000 g of this slurry, 0.1 g of a polyacrylamide-based anionic coagulant was added to increase the viscosity to give a spinnable slurry. Funnel viscosity of this slurry (500m
l) was 60 seconds. When the sedimentation volume was examined,
65% after 2 hours and 20% after 1 week. A non-woven fabric was applied to the lower part of a porous compact formed by using cement paste as a binder by using No. 5 crushed stone as an aggregate, and the slurry was poured from above. Immediately after the injection, the porous molded body was cut off, and the state of filling was examined. As a result, it was found that only the upper portion of about 3 cm was filled. The average pore size of the porous molded body was 5.5 mm.

Comparative Example 2 A mixture of Kanuma soil and field soil sieved with 0.5 mm in a weight ratio of 2: 1 was sprinkled from the top while vibrating the same porous molded body as in Comparative example 1 to fill the mixture. . Since the filling was stopped immediately and the filling was stopped, the cutting state was examined by gently cutting, and it was found that the filling depth was uneven and a bridge was formed and closed.

[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) Kunio Hisamatsu 9-15-1, Kameido, Koto-ku, Tokyo Nippon Kagaku Kogyo Co., Ltd. Research and Development Headquarters (72) Takahiro Nishida 9-15 Kameido, Koto-ku, Tokyo No. 1 Nippon Kagaku Kogyo Co., Ltd. Research and Development Headquarters (72) Inventor Toshio Yonezawa 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside Takenaka Corporation Technical Research Institute (72) Inventor Sakuma Mamoru Inzai, Chiba 1-5-1, Otsuka 1 Technical Research Institute, Takenaka Corporation (72) Inventor Kunio Yanagibashi 1-5-1, Otsuka 1, Inzai City, Chiba Prefecture Inside Technical Research Center, Takenaka Corporation (72) Inventor Atsushi Mizutani Chiba Prefecture 1-5-1, Otsuka, Inzai City, Japan Takenaka Corporation Technical Research Institute (72) Inventor Toshiaki Yamada 8-2-1-1, Ginza, Chuo-ku, Tokyo Takenaka Civil Engineering Co., Ltd. (72) Inventor Norihiko Adachi 8-2-1-1, Ginza, Chuo-ku, Tokyo Japan Stock Company Takenaka Civil Engineering Co., Ltd. (72) Shinichiro Ando 8-2-1-1, Ginza, Chuo-ku, Tokyo Stock Company Company Takenaka Civil Engineering

Claims (5)

[Claims] Claims: 1. A slurry in which organic or inorganic short fibers or powders are dispersed in water to fill voids of a porous molded body applicable to greening of slopes, rooftops, wall surfaces, and the like,
A filling slurry for a plant cultivation base, wherein the slurry has a passage time of 500 ml measured by funnel viscosity in a range of 20 to 45 seconds. 2. Among the short fibers, those having a short fiber length of 1/3 or more of the void average diameter of the porous molded body are 5% by weight or less, and 1/12 to 1 of the void average diameter. The filled slurry for a plant cultivation base according to claim 1, wherein the ratio of the ratio of / 6 is 20% by weight or more. 3. The filling slurry for a plant cultivation base according to claim 1, wherein the short fiber has a number average diameter in a range of 100 μm to 1/12 of a void average diameter as measured by a laser scattering type particle size measurement. 4. The powder according to claim 1, wherein the longest diameter of the powder is 1 / the average diameter of the voids.
The filling slurry for a plant cultivation base according to any one of claims 1 to 3, which is 4 or less. 5. The method according to claim 1, wherein the concentration of the slurry is 1 in terms of solid matter.
The filling slurry for a plant cultivation base according to any one of claims 1 to 4, wherein the amount is from 50 to 50% by weight.