JPH07224428A - Planting mat - Google Patents

Abstract

PURPOSE:To provide a planting mat which is well adaptive to any slope face, can prevent the planting material from flowing away as well from the oversurface as undersurface owing to rainfall, permits plant seeds to well germinate and grow, allows the plant to grow certainly, achieves a sturdy stretch and setting with a decreased number of anchors and set nails, and effectively prevents the seeds, planting base, and surface soil of slope face from flowing away, in particular, without increment of the number of anchors and set nails even in case the slope face is with uneven surface. CONSTITUTION:The second net N is provided on the outside surface of an undersurface sheet 2, and loop threads R to form a loop together with an aux. net (e) are knit in at a certain spacing in the warp direction on the rear surface of a netting in which the second net N is knit from warps a, b and wefts c, d. The loop threads R are contact detention member for the slope face (n).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vegetation mat used for a revegetation method such as a slope of a hillside or a bank of a river, or a slope formed by road construction or land development.

[0002]

2. Description of the Related Art Generally, on the slopes mentioned above, plants are vegetated and greened in order to protect the slopes and maintain the scenery. Conventionally, for example, Japanese Patent Application No. 4-238988 and Japanese Utility Model Publication No.
There is a vegetation mat as disclosed in Japanese Patent No. 26117.

[0003] In the former publication, since peat moss is used as the main constituent of the vegetation material, a vegetation mat which is light and has good workability is disclosed, but peat moss has a water repellency and thus has poor initial water absorption. , Therefore, the vegetation mat is easy to dry and the growth of the plant is not good. For this reason, if a large amount of rain is encountered immediately after construction, the vegetation material often runs away from the top and bottom of the vegetation mat due to the precipitation.

On the other hand, the vegetation mat disclosed in the latter publication is advantageous from the viewpoint of preventing runoff of vegetation material. That is, as shown in FIG. 10, this vegetation mat has a vegetable fiber mat 5 formed into a sheet having a thickness of 5 mm or less by blending a vegetable fiber mainly composed of palm fruit fibers into a non-woven fabric.
Below 1, the bark compost is mainly used, and organic fertilizers, plant organic fertilizers, slow-acting fertilizers, germination promoters, microbial propagation agents, soil conditioners, soil fungi, water retention agents, heat retention agents, moisturizers. 5 by mixing plant seeds into the plant growth base material 52 mixed with
A greening layer material 53 having a thickness of 30 mm to 30 mm is provided, and the upper and lower surfaces of the greening layer material 53 are made of paper or nonwoven fabric 5
It is sandwiched between 4, 55, further covered with both front and back double-sided nets 56, 57, and the whole is sewn with a fiber thread 58.

[0005]

However, the conventional vegetation mat shown in FIG. 10 is effective in preventing runoff of the greening layer material 53, but the greening layer material 53 contacting the slope is Since it is relatively hard, the vegetation mat is not well adapted to the slope and the back surface of the mat tends to be partly lifted from the slope. Moreover, the greening layer material 53 corrodes even if it contains water. Requires a long period of time, and it is difficult for the various fertilizers and soil conditioners to fall on the slope. Therefore, a gap is formed between the vegetation mat and the slope, and even if the seed germinates, it is difficult to root and die. In short, the greening layer material 53 composed of the plant seeds and the vegetation base material does not drop and adhere to the slope, so that it is difficult to dry the vegetation mat and grow the vegetation.

On the other hand, a large number of anchors and pegs are required to firmly stretch the above-mentioned vegetation mat on the slope, and when the slope is uneven, the number of anchors and pegs should be increased. If a large amount of plant seeds and vegetation base materials and slope soil are taken out as measures against runoff, there is a problem that workability deteriorates accordingly.

The present invention has been made in consideration of the above matters, is well adapted to the slope, and can prevent the vegetation material from running off from the upper surface and the lower surface due to precipitation, and can also prevent germination of plant seeds. When the planted organisms can be surely grown by allowing good growth, and furthermore, firm tension can be achieved while reducing the number of anchors and pegs, or when uneven slopes are targeted for tensioning. Even so, it is an object of the present invention to provide a vegetation mat that can effectively prevent runoff of plant seeds, vegetation base materials and sloped topsoil without increasing the number of anchors and pegs.

[0008]

In order to achieve the above object, the vegetation mat of the present invention comprises a top sheet and a bottom sheet which are made of at least partially decomposable material.
While sandwiching the plant seeds and the vegetation base material, a first net having a mesh capable of germination and growth of plant seeds is attached to the outer surface of the upper sheet, and a second net is provided on the outer surface of the lower sheet. In addition, the second net is a net knitted by a warp yarn and a weft yarn, and a loop yarn that forms a loop with the net is formed on the back surface side of the net at appropriate intervals in the warp direction. It is characterized in that it is woven and the loop yarn is used as a contact locking member for the slope.

As the water-soluble sheet in the present invention,
For example, a material that dissolves in a relatively short time when exposed to water such as rain is preferred, and a material that completely dissolves in water, such as polyvinyl alcohol (hereinafter referred to as PVA), is preferable. The water-decomposable sheet does not immediately dissolve in water like a water-soluble sheet, but may be, for example, 30 to 50% pulp fibers, 35 to 45% polypropylene fibers, and 10 to 30%.
%, A water-decomposable nonwoven fabric composed of powdery or fibrous PVA can be used. Further, a pulp material, a material such as a staple material bound with a water-soluble sizing agent, or a clogged water-decomposable sheet may be used.

As the constituent material of the first net 6, in addition to the corrosion-resistant material made of synthetic fiber such as polyethylene, polypropylene or nylon which has been generally used conventionally, it is decomposed by, for example, microorganisms. It has a higher tensile strength than natural fibers such as cotton, silk and hemp that corrode and disappear over time, regenerated fibers such as viscose rayon made of regenerated cellulose, and viscose rayon fibers A corrosive material such as high-strength rayon fiber having the property of being deteriorated and corroded may be used, and further, the first net may be subjected to an antibacterial treatment so that the corrosion timing can be adjusted. .

In the second net of the present invention, the loop yarn provided on the back side of the net contacts and locks on the slope, and the loop yarn functions as a fixing member for tensioning the vegetation mat. It has a function of holding the plant seed, the vegetation base material and the sloped surface soil so that they are entangled with the thread.

[0012]

In the vegetation mat of the present invention, since the upper and lower sheets that cover the plant seeds and the vegetation base material are water-soluble sheets, the whole is highly flexible, and when it is laid on the slope, It fits well to the surface and adheres to the slope with partial lifting suppressed. When the lower surface sheet that is in contact with the slope is decomposed, the plant seeds and the vegetation base material fall onto the slope and are easily adhered to the slope, and a gap is less likely to be formed between the vegetation mat and the slope. In addition, the upper surface side of the vegetation mat is a water-decomposable sheet that is less soluble than a water-soluble sheet
Since the net is provided, the plant seeds and the vegetation base material will not be washed away or freeze up even if there is rainfall. Further, the first net prevents slope erosion. As described above, the above-mentioned vegetation mat forms a growth base suitable for growing plants on the slope, and various plants grow on this growth base.

Further, by providing the second net having the loop yarn which functions as a fixing member for the vegetation mat on the slope on the back side of the vegetation mat, the tension of the vegetation mat on the slope is increased, or The mat tension strength can be maintained even if the number of anchors and pegs used is reduced. Alternatively, since the function of the loop yarn increases the strength of the vegetation mat tensioning, even if the vegetation mat tensioning target is an uneven slope, for example, increase the number of anchors and pegs. Instead, the vegetation mat can be firmly stretched on the slope. On the other hand, the loop yarn of the vegetation mat stretched on the slope is held so that the plant seeds and the vegetation base material and the slope surface soil are entangled, so that the runoff of the plant seeds and the vegetation base material and the slope surface soil is effectively performed. As a whole, it is possible to provide a vegetation mat capable of significantly improving the workability on the slope of the vegetation mat and effectively preventing the plant seed, the vegetation base material and the sloped surface soil from being washed away.

[0014]

1 and 2 show a vegetation mat M according to an embodiment of the present invention. In these drawings, reference numerals 1 and 2 denote a water-soluble top sheet and a water-soluble bottom sheet, respectively. And
Reference numerals 3 and 4 are plant seeds and vegetation base materials which are respectively interposed between the sheets 1 and 2. 5 is a water-decomposable sheet attached to the outer surface side of the top sheet 1, 6 is a first net attached to the outer surface side of the water-decomposable sheet 5, and 7 is a combination of the sheets 1, 2, 5 and the net 6 It is a sewing thread that is sewn together. Reference numeral 9 indicates a portion where the vegetation mat M formed adjacently is cut.

Further, a second net N is attached to the outer surface side of the lower surface sheet 2, and the second net N is further composed of warp yarns a and b.
On the back surface side of the single net knitted by the wefts c and d, a loop yarn R forming a loop by the auxiliary net e is knitted at the same time as the net weaving at an appropriate interval in the warp direction, R is a contact locking member for the slope n.

As shown in FIG. 4, the second net N is formed by, for example, chain-knitting two monofilament warps a and b and knitting two monofilament wefts c and d in a zigzag pattern. In this weaving, one weft c is released from the warp yarns a and b at an appropriate interval in the warp direction, and the released weft yarn c and the remaining warp yarns a and b, A loop R is repeatedly formed on the back surface side of the second net N by the auxiliary net e formed by d (see FIG. 3).

More specifically, at appropriate intervals in the warp direction,
The weft c is entangled with the auxiliary net e in one mesh or in a plurality of meshes, and the loop R is repeatedly formed by releasing the weft c over a predetermined interval. The wefts c and d
It is possible to appropriately select one of the flat yarns as a flat yarn and release it from the auxiliary net e, or conversely, weave the auxiliary net e with the weft yarns and the warp yarns a and b of the flat yarn.

Next, the top sheet 1 and the bottom sheet 2 are made of a water-soluble material such as a completely water-soluble polymer material such as polyvinyl alcohol (PVA) or a water-soluble paper material. It is composed of.

Further, in FIGS. 1 and 6, reference numeral 8 denotes a cut portion, which is cut by a cut line 9 set in the width direction at the central portion of the cut portion 8 during mat production. In the cut portion 8, a mat 10 made of a plant fiber material is interposed between the top sheet 1 and the bottom sheet 2 instead of the plant seeds 3 and the vegetation base material 4. As the vegetable fiber material, for example, a material in which a vegetable fiber mainly composed of palm fruit fiber is molded into a mat is preferable.

In addition to the above, a soft non-woven fabric in which fibers such as rayon or cotton having water-retaining property are adhered with a water-soluble binder without being pressure-bonded is used in a mat-like form, a diaper and the like. As the mat 10, a laminate of a polymer absorber, a paper material having water absorbency and a paper material having appropriate water resistance can be used.

Such a mat 10 does not easily dissolve in water and has a good fixing and assimilation property on the slope n, and at the time of on-site processing, at the joint portion of the vegetation mat M, its cut portion. It does not disappear immediately even if 8 is stacked downward and folded back, it is possible to effectively prevent runoff of the plant seed 3 and the vegetation base material 4, and even in the cut portion 8, the plant seed 3 germinates well.・ Can be grown up. By the way,
The mat 10 has, for example, a width of 25 cm, a length of 1 m, and a thickness of 5
Although a rectangular sheet having a size of about 6 mm is used, it is preferable that as the thickness of the vegetation mat M increases, the thickness of the mat 10 also increases. It should be noted that if two mats 10 are combined and a water retaining material or fertilizer is interposed therebetween, it is possible to promote better germination and growth in the cut portion 8.

When two mats 10 are combined and a water retaining material such as vermiculite or perlite or a fertilizer such as general chemical fertilizer or bark compost is sandwiched between them, the cut portion 8 is It is possible to promote better germination and growth.

As the plant seeds 3 sandwiched between the upper sheet 1 and the lower sheet 2, seeds of exotic plants such as grass and seeds of native plants such as flower plant seeds, wild grasses and trees are used. Used. Specifically, grass seeds include creeping red fescue, highland bentgrass, red top, Bermudagrass, Kentucky bluegrass, and flower plant seeds include yellow daisies, French chrysanthemums, large gold chicken chrysanthemums, and saw grass. , Flycatcher, California poppy, purple hanahana, gypsophila, cosmos, caeto, river dianthus, ginseng, etc., and as wildflower seeds, wormwood,
Japanese pampas grass, Medohagi, there is such as Japanese knotweed. Furthermore, tree plants include red pine, yashabushi, weasel, yamahagi, and komatsunagi. Then, seeds of these plants are appropriately mixed.

The vegetation base material 4 is a base material necessary for plant growth and soil improvement. For example, general chemical fertilizers and soil improvers, organic materials such as bark compost and peat moss, and inorganic materials such as vermiculite and perlite. A suitable mixture of the above is used.

The water-decomposable sheet 5 attached between the upper sheet 1 and the first net 6 is different from the water-soluble upper sheet 1 and the lower sheet 2 in that it is immediately exposed to rainfall or other moisture. It has the property of not melting, for example, 30 to 50% pulp fiber and 35 to 45%
It is possible to use a water-decomposable non-woven fabric composed of the polypropylene fiber and 10 to 30% of powdery or fibrous PVA.

When the proportion of pulp fiber added is 30% or less, problems of dispersibility and strength associated with dissolution of PVA due to water absorption occur. On the other hand, when it is 50%, polypropylene fibers are added. The addition ratio of PVA and PVA decreases, causing problems of solubility due to moisture and problems of strength.

The addition ratio of polypropylene fiber is 3
When it is 5% or less, solubility problems due to water content and strength problems occur. On the other hand, when it is 45% or more, the proportion of pulp fibers and PVA added decreases, and water solubility problems occur. Derive.

If the addition ratio of PVA is 10% or less, the problem of solubility due to water will occur, while if it is 30% or more, the addition ratio of pulp fibers and polypropylene fibers will decrease, and The above problem occurs.

From the above, pulp fiber, polypropylene fiber and PVA are blended in the above-mentioned proportions so as to obtain solubility and constant strength.

The first net 6 is for preventing the frost-up and runoff of the plant seeds 3 and the vegetation base material 4 in the state where the top sheet 1 is melted, together with the water-decomposable sheet 5, and at least the plants. It is necessary to have a texture that allows seed 3 to germinate and grow. In this embodiment, the first net 6 is made of synthetic fiber such as polyethylene, polypropylene or nylon which is generally used in the past, and has corrosion resistance.

As the constituent material of the first net 6, natural fibers such as cotton, silk and hemp that are decomposed and corroded by microorganisms and disappear over time, and regenerated cellulose are used in addition to the above-mentioned corrosion resistant materials. Reusable fibers such as viscose rayon, which has a higher tensile strength than viscose rayon fibers and the like, but may also be used corrosive materials such as strong rayon fibers having the property of decreasing strength over time and corroding, Further, the net may be configured to be subjected to antibacterial treatment so that the corrosion time can be adjusted.

As the first net subjected to the antibacterial treatment, for example, the "vegetation net" for which the applicant of the present invention has applied for a patent on December 19, 1992 (Japanese Patent Application No. 4-355600).
No.) Therefore, the structure of this net will be briefly described.

The following is a method for obtaining the first net subjected to the antibacterial treatment. One is a net composed of the corrosive material alone, or a net formed by using a mixed fiber made of any of the corrosive materials and a synthetic fiber such as nylon or polypropylene,
Applying or spraying an antibacterial agent containing dimethylbenzylammonium chloride as an active ingredient, or
The net is immersed in a treatment tank containing an antibacterial agent.

As the warp or weft constituting the first net, the corrosive material or the mixed fiber is used, and the antibacterial agent is internally added to the material of the warp or the weft in advance. The first net is knitted with a warp and a weft in which is added.

The thus constructed first net has a required strength for, for example, the latter half year to two years when it is laid on the slope, and then gradually corroded to be homogenized with the soil. It has excellent properties.

Jute cotton or rayon is suitable as the sewing thread 7 for sewing the sheets 1, 2, 5, the first and second nets 6, N and the mat 10.

Next, a method for manufacturing the vegetation mat M having the above structure will be briefly described with reference to FIGS.

On the upper surface of the second net N shown in FIG. 5 (A), the lower surface sheet 2 made of a PVA sheet is flown on a conveyor (not shown), and as shown in FIG.
The vegetation base material 4 and the plant seeds 3 are dropped and sprayed on the net N and the lower surface sheet 2. In this case, the non-scattering zone Z (see FIG. 6) having a predetermined width in which the plant seeds 3 and the vegetation base material 4 are not scattered is formed at predetermined intervals. As shown in FIG. 5C, a PVA sheet to be the top sheet 1 is supplied to cover the top surfaces of the plant seed 3 and the vegetation base material 4.

Then, the mat 10 is placed in the non-scattering zone Z.
Throw in. The space between the mats 10 is preferably about 10 m when the thickness of the vegetation mat M is 1 cm, about 5 m when it is 2 cm, and about 3 m when it is 3 cm.

Then, as shown in FIG. 5 (D), both end portions 2a of the lower sheet 2 in the traveling direction are folded upward by a folding device (not shown) and overlapped with the both end portions 1a of the upper sheet 1 to form the upper sheet. 1 and the both end portions 1a and 1b of the lower sheet 2 in the traveling direction are sealed.

Next, as shown in FIG. 5 (E), the water-decomposable sheet 5 is supplied, and the folded portion 2a and the top sheet 1 are fed.
5F, and further, as shown in FIG. 5 (F), the upper surface of the water-decomposable sheet 5 is covered with the first net 6.

As shown in FIGS. 5 (G) and 6, the mat 10 together with the second net N, the lower sheet 2, the upper sheet 1, the water-decomposable sheet 5 and the first net 6.
Are sewn together by a sewing machine device (not shown). It is preferable that the sewing is performed at a relatively small interval (fine mesh) in the folded-back portion 2a, and at a relatively large interval (coarse mesh) at the other portions. Note that reference numeral 25 in FIGS. 5G and 6 indicates a sewing machine needle of the sewing machine.

After the sewing, a cutting device (not shown) cuts the mat 10 at the cut portion 8 into which the mat 10 has been inserted, so that a predetermined length and a predetermined length are obtained as shown in FIGS. 5 (H) and 2. A vegetation mat M of width is formed.
The vegetation mat M is wound into a roll by an appropriate winding device (not shown).

In the vegetation mat M, since PVA sheets are used as the top sheet 1 and the bottom sheet 2 that cover the plant seeds 3 and the vegetation base material 4, no dust is left during the production, and , The working environment is maintained in good condition. Further, when sewing is performed by the sewing machine, the small holes are formed by the sewing machine needle 25 penetrating the upper sheet 1 and the lower sheet 2, and the sheet portion around the small holes acts to close the small holes. Therefore, the plant seeds 3 and the vegetation base material 4 between the top sheet 1 and the bottom sheet 2 do not leak out. Since the PVA sheets are used as the top sheet 1 and the bottom sheet 2, the cut portion 8 is replaced with a mat 10 of plant fibers mainly composed of palm fruit fibers or a water-decomposable sheet 5 of non-woven fabric, instead of PVA. It is also possible to heat-seal the sheet. In addition, the PVA sheet can be obtained at low cost, and the inexpensive vegetation mat M can be obtained.

Further, in the vegetation mat M, since both side ends 2a of the lower sheet 2 in the traveling direction are folded back upward, both side ends 1a of the upper sheet 1 are wrapped by the both side ends 2a. Therefore, the plant seeds 3 and the vegetation base material 4 which are interposed between the sheets 1 and 2 in a scattered state do not leak outside. Furthermore, since both side end portions 2a are folded back so as to overlap the both side end portions 1a of the top sheet 1, the mat 10 interposed in the cut portion 8 is combined with the plant seeds 3 between the sheets 1 and 2. The vegetation base material 4 is completely covered by both the sheets 1 and 2, and does not leak outside.

Now, the vegetation mat M produced as described above is laid on the slope as follows, for example. That is, as shown in FIG. 7, the plurality of vegetation mats M are arranged so that the lower surface sheet 2 is on the side of the slope n through the second net N, and the length direction thereof is the vertical direction of the slope n. In addition, the parts are arranged in the width direction such that the parts in the width direction overlap each other, and are fixed to the slope n by using a fastener 27 such as an anchor. In this case, at the top of the slope n, that is, the shoulder,
As shown in an enlarged manner in the figure, the cut portions 8 formed at both ends in the lengthwise direction are expanded and the fasteners 27 are inserted therein. In addition, at the joint between the vegetation mats M, the cut portion 8 is folded back toward the lower sheet 2, and a fastener 27 is provided so as to pass through the folded portion.

At this time, the slope n is laid by the fastener 27 with the loop R of the second net N facing the slope n. According to the construction of such slope greening, the loop R is the slope n
Since these free wefts c function as a fixing member for tensioning the vegetation mat M, the number of anchors and fasteners 27 for tensioning the vegetation mat M is reduced. In the case where the sloped surface n having unevenness is the target of the vegetation mat M to be stretched, it is possible to securely and firmly stretch the vegetation mat M without increasing the number of anchors or fasteners 27. Further, the plant seeds 3 and the vegetation base material 4 and the sloped surface soil are held so as to be entangled in the free weft c, so that the plant seeds 3 and the vegetation base material 4 and the sloped surface soil may be washed away by rainfall or freezing. Effectively prevented.

In addition, since the vegetation mat M is made of thin water-soluble sheets, the upper and lower sheets 1 and 2 are thin water-soluble sheets, so that the entire mat is highly flexible, and even if the slope n has some irregularities, the slope n It fits well on the slope n without being partially raised. And vegetation mat M
In the initial stage of laying on the slope n, the plant seeds 3 and the vegetation base material 4 are covered with both the sheets 1 and 2, so that their outflow is effectively prevented.

When the vegetation mat M is splashed with water due to rainfall or sprinkling water, the upper surface sheet 1 and the lower surface sheet 2 are quickly dissolved, and in particular, the lower surface sheet 2 in contact with the slope n is faster than the upper surface sheet 1. Dissolve in. Therefore, the plant seeds 3 and the vegetation base material 4 in the vegetation mat M are in close contact with the slope n without any gap, and the second net N
The plant seeds 3 easily germinate without disturbing the seedlings, and the germinated seedlings surely grow by receiving fertilizer and water.

On the other hand, on the top sheet 1 of the vegetation mat M,
Since the water-decomposable sheet 5 and the net 6 which are less likely to dissolve than the PVA sheet are provided, the vegetation mat M
The matting end of the mat 10 does not easily dissolve in water.
Has been established on the slope n, so that the plant seeds 3 and the vegetation base material 4 on the slope surface n are favorably held appropriately, and the frost heave and runoff of the plant seeds 3 and the vegetation base material 4 are effective. Be prevented.

When the plant grows, the mat 10 is assimilated with the slope n, so that the plant can take root sufficiently, and like the other parts, early greening without growth unevenness can be achieved. It can be achieved reliably.

As a water-soluble sheet, and since the mat 10 is assimilated with the slope n when the plant grows, the plant can take root sufficiently and grow like other parts. It is possible to surely achieve even greening evenly.

Then, the top sheet 1 and the bottom sheet 2
As the water-soluble sheet to be used respectively, a water-soluble polymer film may be used in addition to the above PVA sheet. Further, as the water-decomposable sheet 5, it is also possible to use one obtained by binding a staple, polypropylene, nylon or the like with a water-soluble sizing agent such as PVA, or water-degradable paper obtained by binding a paper made of a pulp material with a water-soluble sizing agent. further,
A net T having a tight mesh as shown in FIG. 8 may be used. In this case, the net T is preferably made of a corrosive material such as viscose rayon.

As a constituent material of the second net N, it is preferable to basically use the same material as that of the first net. That is, in addition to the corrosion-resistant material used for the first net, natural fibers such as cotton, silk, and hemp that are decomposed and corroded by microorganisms and disappear over time, and regenerated fibers such as viscose rayon made of regenerated cellulose. Alternatively, a corrosive material such as strong rayon fiber, which has a tensile strength higher than that of viscose rayon fiber, etc., but has the property of decreasing in strength over time and corroding, may be used. It may be configured so that the corrosion time can be adjusted.

Furthermore, in each of the above embodiments, the plant seed 3
The upper sheet 1, the water-decomposable sheet 5 and the net 6 are provided above the vegetation base material 4, and only the lower sheet 2 is provided below the plant seeds 3 and the vegetation base material 4. However, this structure may be variously changed as described below.

That is, the vegetation mat M in which the water-decomposable sheet is attached to the lower surface of the lower surface sheet 2 may be used. It goes without saying that this water-decomposable sheet can be made of various types, like the water-decomposable sheet 5 described above. In the vegetation mat M configured as described above, since the lower surface sheet 2 made of a water-soluble sheet does not directly contact the slope n, there is an advantage that it can be applied even when the slope n has some water. Alternatively, the top sheet 1 or the bottom sheet 2 may be formed of a sheet material that at least partially decomposes, such as the above-described water-decomposable sheet or microbial-decomposable sheet.

The second net N shown in FIG. 9 has wefts c and d.
By changing the mesh pitch of the
Weaving is performed so as to form a horizontal striped pattern that repeats sparse and dense in the warp direction, and in this weaving, one weft c ₁ is released from the sparse net portion n ₁ and the weft c ₁ is woven into the dense net portion n ₂ . Then, a large loop R is repeatedly formed on the back surface side of the net by the loosened weft c and the auxiliary net (sparse net portion n ₁ ) e formed by the remaining warps and wefts a, b and d.

[0058]

As described above, in the vegetation mat of the present invention, the upper and lower sheets that cover the plant seeds and the vegetation base material are water-soluble sheets, so that partial lifting is suppressed. It adheres to the slope in the state where it was made. When the lower surface sheet that is in contact with the slope is decomposed, the plant seeds and the vegetation base material fall onto the slope and are easily adhered to the slope, and a gap is less likely to be formed between the vegetation mat and the slope. In addition, since the upper surface side of the vegetation mat is provided with a water-decomposable sheet and a first net that are less soluble than a water-soluble sheet, the plant seeds and the vegetation base material may be washed away or freeze up even in the event of rainfall. There is no. Further, the first net prevents slope erosion.

Further, by providing the second net having the loop yarn, which functions as a fixing member of the vegetation mat on the slope, on the back side of the vegetation mat, the tension of the vegetation mat on the slope is increased, or The mat tension strength can be maintained even if the number of anchors and pegs used is reduced. Alternatively, since the function of the loop yarn increases the strength of the vegetation mat tensioning, even if the vegetation mat tensioning target is an uneven slope, for example, increase the number of anchors and pegs. Instead, the vegetation mat can be firmly stretched on the slope. On the other hand, the loop yarn of the vegetation mat stretched on the slope is held so that the plant seeds and the vegetation base material and the slope surface soil are entangled, so that the runoff of the plant seeds and the vegetation base material and the slope surface soil is effectively performed. As a whole, it is possible to provide a vegetation mat capable of significantly improving the workability on the slope of the vegetation mat and effectively preventing the plant seed, the vegetation base material and the sloped surface soil from being washed away.

As described above, according to the vegetation mat of the present invention, a growth base suitable for growing plants is formed on the slope.
Various plants can be successfully grown on this growing base.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a vegetation mat according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a vegetation mat in the above embodiment.

FIG. 3 is a sectional view of the vegetation mat in the same example.

FIG. 4 is an explanatory diagram of a configuration of a second net in the above embodiment.

FIG. 5 is a drawing for explaining the manufacturing process of the vegetation mat in the above-mentioned embodiment.

FIG. 6 is a partial cross-sectional perspective view showing an example of a sewing process of the vegetation mat in the above-mentioned embodiment.

FIG. 7 is a perspective view showing a state in which the vegetation mat in the above embodiment is laid on the slope.

FIG. 8 is a perspective view showing an example of a water-decomposable sheet.

FIG. 9 is a perspective view showing another example of the second net.

FIG. 10 is a perspective view showing a conventional example.

[Explanation of symbols]

1 ... Top sheet, 2 ... Bottom sheet, 2a ... Side edge part, 3 ...
Plant seeds, 4 ... Vegetation base material, 5, T ... Water-decomposable sheet, 6 ...
1st net, 8 ... Cut part, a, b ... Warp, c ... Weft (contact locking member), d ... Weft, e ... Auxiliary net, R ...
Loop, n ... slope, M ... vegetation mat, N ... second net.

Claims (5)

[Claims] 1. A plant seed and a vegetation base material are sandwiched between an upper sheet and a lower sheet made of at least a partially decomposable material, and germination and growth of the plant seed is performed on the outer surface side of the upper sheet. A first net having a possible mesh is provided, a second net is provided on the outer surface side of the lower sheet, and the second net is a net knitted with warp and weft, A vegetation mat, characterized in that on the back side of the net, loop yarns forming a loop with the net are knitted at appropriate intervals in the warp direction, and the loop yarns serve as a contact locking member for the slope. 2. The vegetation mat according to claim 1, wherein a water-decomposable sheet is attached between the top sheet and the first net. 3. The vegetation mat according to claim 1, wherein a water-decomposable sheet is attached between the bottom sheet and the second net. 4. The vegetation mat according to claim 1, wherein the top sheet and the bottom sheet are polyvinyl alcohol sheets. 5. The vegetation according to claim 1, wherein the second net has a horizontal stripe pattern in which the weft yarns have different mesh pitches in the warp direction at appropriate intervals, and a single net repeats sparse and dense in the warp direction. Net.