JP2002125453A - Greening structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a greening structure which is lightweight, can prevent the collapse of culture soil, can uniformly be watered, and is suitable for the wall surface of the built structure. SOLUTION: This greening structure comprising a fiber-formed article whose spaces are filled with culture soil, and water-retaining layers which cover the vegetation face-removing faces of the fiber-formed article, characterized in that the fiber-formed article is obtained by randomly laminating mixture webs comprising two or more kinds of crimped fibers having mutually different finenesses so that a fine fineness fiber web layer and a thick fineness fiber web layer are distributed on one side and on the other side, respectively, in the thickness direction, continuously forming a density gradient between both the web layers, adhering and fixing the mutual contact points of the fibers, and disposing the thick fineness fiber web on the vegetation side, and further in that the culture soil is a soil capable of being swollen with applied water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a greening structure. More specifically, the present invention relates to a greening structure suitable for planting a wall of a building structure.

[0002]

2. Description of the Related Art In recent years, there has been an increasing interest in greening of living spaces, rooftop greening and veranda gardening have become widespread, and greening has also attracted attention indoors in highly public building structures such as shopping malls and hotels. . As a result, greening has been attempted not only on a horizontal surface but also on a wall surface having a structure that is vertical or nearly vertical. Also,
Vegetable plants such as ivy have conventionally been used for greening the walls of building structures, but attempts have been made to use various plants depending on the purpose and use. For example, in the case of rooftop greening, sedums such as stonecrop, which can be easily cared for, have a small plant height, and provide uniform vegetation, have been used. Attempts have been made to use these sedums for greening wall surfaces. Attempts have also been made to use lichens as vegetation.

[0003] In the case of greening the wall, in order to maintain a beautiful scenery at the time of construction, the greening structure itself is not only lightweight, but also the collapse of the cultivated soil is prevented and uniform watering is possible. A different approach is needed from greening the horizontal plane. However, there is no actual condition that satisfies these requirements.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a greening structure suitable for planting a wall surface of a building structure, which is lightweight and capable of preventing collapse of cultivated soil and enabling uniform watering.

[0005]

Means for Solving the Problems As a result of intensive studies, the present inventor has found that a greenery structure comprising a fibrous formed body filled with cultivated soil in a void and a water retaining layer covering a surface of the fibrous formed body except for a vegetation surface. In the fibrous formed body, a mixed web composed of two or more types of crimped fibers having different finenesses is randomly arranged and laminated, and a fineness fiber web layer is mainly distributed on one side in the thickness direction. A fiber in which a large-fiber fiber web layer is distributed as a vegetation surface, in which a large-fiber fiber web layer is mainly distributed on the other side, a density gradient is continuously formed therebetween, and a contact point between the fibers is adhesively fixed. The present inventor has found that a greening structure, which is a molded body and is a cultivated soil in which the cultivated soil swells by irrigation, can solve this problem, and completed the present invention based on this finding.

The present invention comprises the following. (1) A greening structure composed of a fibrous molded body filled with soil in a void and a water retaining layer covering a surface excluding a vegetation surface of the fibrous molded body, wherein the fibrous molded body has two different sizes. The mixed web composed of the above crimped fibers is randomly arranged and laminated, the fine fiber web layer is mainly distributed on one side in the thickness direction, and the fine fiber web layer is mainly distributed on the other side, and between them. It is a fibrous molded body that is continuously installed with a density gradient and the fibers are bonded and fixed at the contact points between fibers, and is installed on the large fineness fiber web layer side as a vegetation surface. Greening structure characterized.

(2) The mixed web has a fineness of 100 to 5
The greening structure according to the above (1), wherein the greening structure comprises fibers having different finenesses of 000 dtex and 2 to 120 dtex.

(3) The fibers constituting the mixed web are:
The greening structure according to the above (1) or (2), which is a heat-adhesive conjugate fiber comprising a low melting point component and a high melting point component.

(4) The greening structure according to the above (3), wherein the heat-adhesive conjugate fiber is a fiber comprising polyolefin resins or a polyolefin resin and a polyester resin.

(5) The water retention layer has a fineness of 2 to 120 dte
x, heat-bondable conjugate fiber having a fiber length of 38 to 128 mm
50-50 weight per unit weight which is a mixture of 45-90% by weight of cotton wool fibers
0 g / m ^TwoThe non-woven fabric of the above
The greening structure according to any one of (1) to (4).

(6) The cultivation is performed by adding coconut husk compressed granules to 20-
The greening structure according to any one of the above (1) to (5), comprising 99.5% by volume and 0.1 to 10% by volume of a water absorbent resin.

[0012]

Embodiments of the present invention will be described below. The fiber molded article used for the greening structure of the present invention is composed of thermo-adhesive fibers having two or more types of crimps having different finenesses (hereinafter referred to as heterofine fibers). In the present invention, the thermoadhesive fibers are fibers composed of a thermoplastic resin.

When the heterofine fiber used in the fiber molded article is a heat-adhesive conjugate fiber composed of a low-melting component and a high-melting component, the fiber intersection is easily fixed by heat bonding, and the bonding strength at the intersection is sufficient. is there. The difference in melting point between the low melting point component and the high melting point component is preferably 15 ° C. or more. The heat bonding treatment is preferably performed at a temperature not lower than the melting point of the low-melting component and not higher than the melting point of the high-melting component. Further, the conjugate fiber is a fiber composed of two or more components in which at least a part of the fiber surface is composed of a low melting point component, and examples of the form include a sheath-core type, an eccentric sheath-core type, a side-by-side type, and a sea-island type. it can.

The combination of the thermoplastic resins constituting the heat-adhesive conjugate fiber is not particularly limited, but is preferably a combination of polyolefin resins or a combination of a polyolefin resin and a polyester resin in terms of price and the like. Polyolefins are preferred from the viewpoint of lightness. In addition, a coloring agent, a light-proofing agent, a flame retardant, an antibacterial agent, and the like may be added to the thermoplastic resin depending on the application as long as the effects of the present invention are not impaired.

The fiber molding used in the present invention comprises:
Mixed webs composed of fibers of different densities are randomly arranged and laminated, a fine denier fiber web layer is mainly distributed on one side in the thickness direction, and a large denier fiber web layer is mainly distributed on the other side, and continuously between them. It is a bulky and void-filled fiber molded body in which a density gradient is formed and the points of contact between the fibers are adhered and fixed. By using this fiber molded body, the soil swelled by watering is easily filled in the void of the fiber molded body in a dry state, and after filling and irrigated and swollen, it is held and fixed in the void of the fiber molded body, Even if the fiber molded body is tilted, it hardly moves.

The fineness of the different fineness fibers used in the fiber molded article is two or more. For example, in the case of two types, different finenesses of 100 to 5000 dtex as fine fibers and 2 to 120 dtex as fine fibers are used. Fibers. Above all, if a two-dimensional or three-dimensional crimped fiber is used as the large fineness fiber, a 200-3000 dtex fiber, and a two-dimensional or three-dimensionally crimped 30-100 dtex fiber is used as the fineness fiber, the resulting fiber molding is obtained. The body has excellent shape retention even when vegetation is growing,
Also, it has excellent holding and fixing properties of the soil.

The fiber length of the large fineness fiber is 38 to 128.
mm, especially 89 to 128 mm, is suitable for forming a density gradient. Further, the fiber length of the fineness fiber is 38 to
128 mm, especially 64-89 mm, is suitable for forming a density gradient. In particular, when the fiber length of the large fine fiber is extremely shorter than the fiber length of the fine fine fiber, it is difficult to form a density gradient, which is not preferable.

[0018] The ratio of the different fineness fibers to be mixed is as follows.
0 to 90% by weight is desirable. The weight ratio of fine fiber is 1
If the content is less than 0% by weight, the fine fiber is distributed in a large amount in the vicinity of the surface layer on one side in the thickness direction of the fiber molded body, so that it is difficult to form a desired density gradient. It is easy to peel off. On the other hand, if it exceeds 40% by weight, it is difficult to form a density gradient because the fineness fibers are distributed throughout the web.

In the fibrous formed body, the fine fiber web layer mainly distributed on one side in the thickness direction gradually decreases in density toward the other side in the thickness direction. The fine-fiber fiber web layer is distributed continuously next to the fine-fiber fiber web layer, but both are mixed at the boundary of the layers and the layers are not separated. The density of the thick fine fiber web layer gradually decreases toward the other side in the thickness direction. In the surface layer on the other side, fibers with large fineness are mainly distributed, and the structure has a gentle density gradient as a whole.

Another feature of the fiber molding is that it has a structure in which mixed webs of fibers of different fineness are randomly arranged and entangled. This means that the fiber molded body formed through the normal card method step has a remarkable difference in strength in the longitudinal direction / horizontal direction, whereas the fiber molded body formed by the production method of the present invention has The difference is that there is no difference in the direction / lateral direction. That is, the web that has undergone the normal carding process is mostly arranged in the flow direction (longitudinal direction) of the card web, whereas the web formed by the manufacturing method of the present invention has a relationship in the vertical / horizontal direction. Since they are randomly arranged, they exhibit almost equal tensile strength in both the longitudinal and transverse directions. Such randomly arranged webs contribute to the effect of being excellent in water permeability and air permeability, and also excellent in shape retention, including elasticity and cushioning properties.

As a method of manufacturing the fiber molded body, a mixed web composed of fibers of different fineness is divided and scattered using a random webber, and is sequentially deposited while forming a density gradient on a moving conveyor, followed by an adhesive treatment. Is mentioned. Alternatively, a crimp may be generated during the bonding process after a mixed web of fibers of different fineness having no crimp is separated and scattered and sequentially deposited while forming a density gradient on a moving conveyor. Further, it is also possible to use a method in which a mixed web composed of fibers of different fineness after the division and scattering is caused to collide with a collision member to sequentially deposit while forming a density gradient on a moving conveyor. Such a fiber molded article is disclosed in JP-A-8-209514.
Can be manufactured by the method disclosed in Japanese Patent Publication No.

The thickness and basis weight of the fiber molded body vary depending on the type of vegetation, the type and amount of cultivation, and the like, and are not particularly limited, but are generally 25 to 100 mm, preferably 30 to 100 mm.
It is desirable that the thickness is from 70 to 70 mm and the basis weight is from 500 to 5000 g / m ² , preferably from 700 to 3000 g / m ² .

In the present invention, the water-retaining layer is formed by the fiber molding.
Covering the surface of the body except for the side of the fine fiber web layer,
Spills when filling the molded body with soil, unswelled immediately after initial irrigation
Prevent the runoff of humid soil and the flow of fine soil during vegetation irrigation
At the same time, it retains moisture to prevent the soil in the fiber compact from drying out.
In addition, it also has a function of transmitting excess moisture. Water retention
The material of the layer is not limited as long as it has the above function.
Has a fineness of 2 to 120 dtex and a fiber length of 38 to 128 mm
45 to 90 weights of absorbent cotton fiber is added to the above-mentioned heat-adhesive conjugate fiber.
%, Preferably 60 to 80% by weight.
0-500g / m ^TwoIs preferably used. Degreasing
If the amount of cotton fiber is less than 45% by weight, water retention is insufficient.
Yes, if it exceeds 90% by weight, the non-woven fabric will become brittle and strong
It is going down. The method of covering the fiber molded body with the water retention layer
The method is not particularly limited, heat fusion, adhesion using an adhesive,
Any method such as suturing may be used.

In the greening structure of the present invention, a swelling medium that swells due to irrigation is used. Examples of the components of the cultivated soil include coconut shell compressed granules and peat moss compressed material, and coconut shell compressed granules that are inexpensive and have good water absorption are preferably used. The coconut shell compressed granules are obtained by compressing what is called coir dust from the mesocarp of coconut nuts and removing the long and medium fibers, and processing the granules into granules. Production of compressed coconut shell granules is disclosed in Japanese Patent Application Laid-Open No. 11-30264.
The method can be carried out by the method disclosed in Japanese Patent Application Laid-Open Publication No. 6-64.

When coconut shell compressed granules are used as a component of the cultivation soil, the size thereof is not limited as long as the granules can be filled in the voids of the fibrous molded product.
Granular pellets of up to 6 mm can be exemplified. When coconut shell compressed granules are used as a component of the cultivated soil, the content of the coconut shell compressed granules in the cultivated soil is 20 to 99.5% by volume,
Preferably, it is 25 to 60% by volume. If the content is less than 20% by volume, the swelling of the soil during irrigation is insufficient, and if it exceeds 99.5% by volume, it becomes difficult to control the degree of swelling of the soil.

In the present invention, it is preferable to further use a water-absorbing resin as a component of the soil to improve the water retention of the soil. Examples of the water-absorbent resin include a carboxymethylcellulose crosslinked product, starch-acrylonitrile graft copolymer, polyvinyl alcohol, polyacrylate, and a copolymer of N-isopropylacrylamide and sodium acrylate. A thermosensitive water-absorbing resin obtained by polymerizing N-isopropylacrylamide, sodium acrylate, and diacetone acrylamide, which have a large holding amount and are relatively easy to release, in the presence of a crosslinking agent (trade name: Thermogel, Inc. )
Kojin) is preferably used.

The content of the water-absorbing resin in the cultivation soil is as follows:
It is desirable that it is 0.1 to 10% by volume, preferably 0.5 to 3% by volume, and if it is less than 0.1% by volume, the water retention of the soil is insufficient, and if it exceeds 10% by volume, the soil is soiled. Excessive moistening may cause growth disorders such as root rot of plants.

In the greening structure of the present invention, in order to control the swelling of the soil and maintain its shape, an inorganic particulate material may be used as a component of the soil, if necessary, in addition to the coconut shell compressed granules and the water absorbent resin. Can be. As the inorganic particulate matter, calcined vermiculite, perlite,
Examples include zeolite, mullet earth, calcined diatomaceous earth, volcanic rubble, recycled glass foam, and the like, and a porous foam is preferred in terms of lightness and water retention.

As shown in FIGS. 1 and 2, the greening structure of the present invention has a structure in which the surface of the fiber molded body 1 in which the voids are filled with the soil, except for the side of the fine fiber web layer, is covered with the water retaining layer 2. .
The upper side in FIG. 2 of the fiber molded article 1 has a large fineness fiber web layer and a large gap, and the lower side has a fine fineness web layer and a small gap. The soil in the dry state is filled from the upper side in FIG. 2, and a fine portion of the soil falls into the lower fine fiber web layer, and a large portion of the soil is trapped in a gap in the middle of the fall. Vibration may be used to facilitate the filling of the voids with the soil. After filling the cultivation soil and irrigating, the compressed coconut shell granules in the cultivation soil absorb water and swell, and the cultivation soil is fixed in the voids and becomes difficult to move.

Depending on the type of the plant, the plant is located on the upper side of FIG.
That is, it is planted and cultivated on the surface of the fibrous molded article 1 on the side of the large fineness fiber web layer by a method such as sowing, cutting or transplanting. In order to increase the efficiency of planting, plug seedlings that have been raised in advance may be planted using an automatic planting machine. As the plant grows, the root grows and becomes entangled with the fiber molded body, and the cultivation is further entangled with the root so that it hardly moves.In this state, the greening structure of the present invention has an inclined surface or a surface almost vertical. The plant will not fall off even if it is installed in the area. In addition, when the greening structure of the present invention is installed on an inclined surface or a surface nearly perpendicular to the greening structure, the strength and air permeability such as a metal perforated plate on the bottom as shown in FIG. It is preferable to use a water-permeable support, fix the greenery structure to the support, and then attach this support to the building structure. In addition, a water-permeable cushion layer or root layer may be provided between the support and the greening structure as needed.

When the greening structure of the present invention is installed on a nearly vertical surface, the greening structure is held down on a vegetation surface with a thin string, an iron wire, a wire mesh or the like in order to prevent the greening structure itself from overturning and falling. It is desirable to fix the greening structure to the support by using a fixture that is fixed to the support or that penetrates the greening structure.

The size of the greening structure of the present invention is appropriately selected depending on the place where it is installed, etc., but it is necessary that a uniform watering state can be obtained and a good growth state can be maintained. When installed on an inclined surface, the vertical difference of the greening structure is 50c in order to uniformly water the entire greening structure by water supply using gravity from above and water supply using capillary action from below.
m, preferably 40 cm or less. Therefore, when the greening structure of the present invention is used for greening a slope having a height difference of more than 50 cm, it is desirable to install an irrigation device and its auxiliary device every 50 cm of the height difference. Specifically, the above-mentioned support or building structure is
It is preferable to combine a drainage device.

The plant used as the vegetation of the greening structure of the present invention is not particularly limited, and can be appropriately selected from a group of so-called ground cover plants according to the purpose and application. Among them, the vine plants Hedera, which has been used for greening the walls of building structures,
Sedums that do not exceed a certain size, require little care such as cutting, are resistant to drying and exhaust gas from automobiles, and have a long service life are preferred.

Examples of the hederas include hedera helix, hedera canariensis, and hedera corsica, and the methods of greening the wall by the hederas include drooping and climbing.

Examples of the sedums include Mexican stonecrop, periwinkle, giraffe, lycopodium, lycopodium glauca, lycopodium glaucombaceae, takane mangusa, yahazu mannegusa, himerenge, marba mannegusa, satsuma mannegusa, swordfish, swordfish, swordfish, swordfish, swordfish, and squirrelfish. Tight turtle, Munting turtle, Kogome mangansa, Unzen mangansa, Omeno mangansa, Matsunohamanenusa, Onomannengansa, Hakobemannensha, Usuyukimannensa, etc. There is no need for fertilization.

In the present invention, fertilization can be carried out as appropriate depending on the type of plant used as vegetation and the growth environment.
The fertilizer may be mixed with the soil at a rate of g / m ² and fertilized, and a liquid fertilizer may be fertilized at the time of watering as an additional fertilizer.

[0037]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited thereto.

Embodiment 1 1. Fiber molded body The sheath component of the heat-adhesive composite fiber is composed of a high-density polyethylene resin (low-melting component) having a melting point of 135 ° C, and a core component composed of a polypropylene resin (high-melting component) having a melting point of 162 ° C. , The weight ratio of which is 1: 1; a fineness of 2500 dtex provided with a three-dimensional crimp; a fiber length of 128 mm.
80% by weight of the fine fineness fiber of the above and the same components as the fine fineness fiber, and a two-dimensional crimped fineness of 65 dtex;
20% by weight of fine fiber having a fiber length of 64 mm was mixed, and a random web was used to obtain a randomly arranged web having a density gradient of 750 g / m ² . This web is subjected to a heat treatment at a temperature of 148 ° C. for 5 minutes by a hot air aisle-type heater of a net conveyer holding type, and is appropriately pressurized before cooling to obtain a 30 mm-thick heterogeneous fiber mixed web. Laminated in a random arrangement, the fine fiber web layer is mainly distributed on one side in the thickness direction, and the large fiber web layer is mainly distributed on the other side, and a continuous density gradient is formed therebetween, and the fibers Are obtained, the intersections of which are fixed by heat bonding. One 50 × 50 cm rectangular solid (A) and two 50 × 100 cm rectangular solids (B) were cut out from the fiber molded body.

2. Formation of water-retaining layer The sheath component of the heat-adhesive conjugate fiber is composed of a high-density polyethylene resin (low-melting-point component) having a melting point of 135 ° C, and the core component is composed of a polypropylene resin (high-melting-point component) having a melting point of 162 ° C. The average fineness is 35, wherein the weight ratio of the components is 1: 1.
A dtex, 65% by weight of absorbent cotton fiber was mixed with a heat-adhesive conjugate fiber having an average fiber length of 64 mm, and a fiber intersection was thermally bonded by an air-through method to obtain a nonwoven fabric having a basis weight of 100 g / m ² . The nonwoven fabric was coated on the five surfaces except for the two types of rectangular parallelepiped fiber webs by thermal bonding to form a water retention layer.

3. Preparation of cultivated soil Yashigara compressed granules (Chisso Asahi Fertilizer Co., Ltd.) with an average size of 3 mm in diameter x 4 mm in length and about twice the volume when absorbing water
30% by volume of apparent specific gravity of about 0.5, moisture content of 8% by weight), 68% by volume of mulch (approximately 0.7 of apparent specific gravity), water-absorbent resin thermogel (trade name; apparent specific gravity of about 0.5,
(Manufactured by Kojin Co., Ltd.) at a ratio of 2% by volume, and mixed with a tumbler mixer to obtain soil. The apparent specific gravity of the cultivated soil is about 0.
It was 6.

4. Filling of the cultivated soil The coated fiber fabrics (A) and (B) are placed on a flat surface with the uncoated surface facing up, (A) 6 liters of the cultivated soil, and (B) 1 liter of the cultivated soil. 12 liters per piece,
After spraying on the uncoated surface of the fiber molded body and leveling it with a transplanter,
The soil was filled into the fiber molding by shaking lightly to the left and right. The cultivated soil easily entered the fiber molded body and was filled quickly. After filling the cultivation soil, about 7.5 liters of water are poured into (A) and 15 liters of water per piece into (B) using a watering can to swell the cultivation soil, and the greening structures (A) and ( B). After 60 minutes from the watering, the greening structure (A) was tilted to make the uncovered surface almost vertical, but almost no dropout of the soil was observed. The greening structures (A) and (B) after filling and irrigating the soil were about 40 mm thick.

5. Cultivation and installation of vegetation After filling and irrigating the cultivation soil, the uncovered surface of the greening structure (B) is leveled, and the buds of Mexican stonecrop are sowed with about 250 pieces per greening structure (B) and covered with compressed coconut shell granules. They were irrigated and cultivated in a greenhouse for 90 days. When the plant height is about 10 cm, the two greening structures (B) 8 are vertically 100 cm × horizontal 100 cm × 40 mm deep having perforations 5 on the bottom and side surfaces as shown in FIG.
It is housed in an aluminum container-like support 3 having a thickness of 1 mm,
Using the perforations on the side of the support, insert the iron wire 4 vertically on the vegetation surface.
It was fixed to the container-like support 3 with a horizontal width of 20 cm.

The bottom surface of the support 3 has a hole diameter of 10 m.
m, a perforated plate having 2500 holes / m ² , an aluminum partition plate 6 having perforations between two greening structures (B)
(The thickness of the plate was 1 mm, the length was 100 cm, and the width was 40 mm). Further, reinforcement was applied to the outside of the bottom and side surfaces of the support. The perforations on the bottom and side surfaces of the support and the partition plate are used for weight reduction of the support, ventilation and irrigation and drainage of the soil, and fixing and binding of the greenery structure to the support. The support on which the greenery structure having the vegetation 7 was housed and fixed had the vegetation surface almost vertical, but the plants did not collapse and could be installed on the wall of the building structure. When the inside of the greening structure was observed, it was found that the roots of the plant were entangled with the fibers of the fiber molded body while holding the soil.

Comparative Example 1 According to the method of Example 1, except that only the fine-fiber fibers were used without using the fine-fiber fibers, the basis weight was 750 g / m ² , and there was no density gradient in the thickness direction. A fiber molded body fixed by bonding was obtained. 50 × 50 from this fiber molding
1 cm rectangular parallelepiped (A ′) and 2 50 × 100 cm rectangular parallelepipeds (B ′) were cut out, and the formation of a water-retaining layer and the preparation and filling of soil were performed in accordance with the method of Example 1. The filling of the cultivation soil was performed promptly, and after filling the cultivation soil, about 30 liters of water was poured with a watering funnel to swell the compressed coconut shell granules to obtain greening structures (A ′) and (B ′), respectively.
60 minutes after watering, the greening structure (A ') was tilted to make the uncoated surface almost vertical, and about 90% by weight of the cultivated soil fell off.

The vegetation cultivation and installation were tested in accordance with the method of Example 1 for the greening structure (B ') after filling and irrigating the soil. Green structure with vegetation (B ')
When the vegetation surface of the support in which the was stored and fixed was made almost vertical, about half of the plants collapsed with the cultivation.

[0046]

[Effect] The greening structure of the present invention uses a thermoplastic resin fiber molded body having a structure that is lightweight and has excellent holding properties for soil cultivation.
By using swellable coconut shell compressed granules as a component of the cultivation soil, collapse of the cultivation soil can be prevented, uniform watering can be performed, and it is suitably used for planting wall surfaces of building structures.

[Brief description of the drawings]

FIG. 1 is a schematic view of a greening structure of the present invention.

FIG. 2 is a schematic cross-sectional view taken along the line SS ′ of the greenery structure of FIG. 1.

FIG. 3 is a schematic view showing a case where the greening structure of the present invention is mounted on a support and used for wall greening. Explanation of the reference numeral 1: a fiber molded body containing cultivated soil. The fine fine fiber web layer is mainly distributed on the upper side of the figure, and the fine fine fiber web layer is mainly distributed on the lower side. 2: Water retention layer 3: Container-like support 4: Overturning iron wire 5: Perforation 6: Partition plate 7: Vegetation 8: Greening structure

Claims (6)

[Claims] 1. A greening structure comprising a fibrous molded body filled with soil in a void and a water retaining layer covering a surface of the fibrous molded body excluding a vegetation surface, wherein the fibrous molded body has a different fineness. A mixed web composed of two or more types of crimped fibers is randomly arranged and laminated, the fine fiber web layer is mainly distributed on one side in the thickness direction, and the large fine fiber web layer is mainly distributed on the other side, Meanwhile, a density gradient is continuously formed,
A greening structure, which is a fibrous formed body having a large fineness fiber web layer side as a vegetation surface to which a contact point between fibers is adhesively fixed, wherein the cultivated soil is swelled by irrigation. 2. The mixed web has a fineness of 100-5000.
The greening structure according to claim 1, wherein the greening structure is made of fibers having different finenesses of dtex and 2 to 120 dtex. 3. The greening structure according to claim 1, wherein the fiber constituting the mixed web is a heat-adhesive conjugate fiber comprising a low melting point component and a high melting point component. 4. The greening structure according to claim 3, wherein the heat-adhesive conjugate fiber is a fiber comprising polyolefin resins or a polyolefin resin and a polyester resin. 5. A water-retaining layer comprising 45 to 90% by weight of absorbent cotton fiber mixed with a heat-adhesive conjugate fiber having a fineness of 2 to 120 dtex and a fiber length of 38 to 128 mm, and a basis weight of 50 to 500 g /
any one greening structure according to claims 1 to 4, characterized in that it consists of non-woven m ^2. 6. The cultivation soil comprises compressed coconut husks of 20-99.
The greening structure according to any one of claims 1 to 5, comprising 5% by volume and 0.1 to 10% by volume of a water-absorbing resin.