Pin for fixing vegetation sheet, method for manufacturing the same, and method for fixing vegetation sheet

Abstract

To provide a pin for fixing a vegetation sheet and a vegetation sheet fixing method which can be used to fix a vegetation sheet having raw cotton (non-absorbent cotton) to improve the vegetation effect.SOLUTION: A pin P for fixing a vegetation sheet according to the present invention has a shaft 8 that can penetrate a vegetation sheet S in its thickness direction, and holds a surfactant. The surfactant is held at a site in contact with the vegetation sheet S. The surfactant is a nonionic surfactant, particularly an ether-based nonionic surfactant.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention is effective for, for example, lawn vegetation, and is used for fixing a vegetation sheet laid on a construction target area (soil surface) such as a park green space, a riverbank, a slope, etc. The vegetation sheet fixing pin and The manufacturing method and a method for fixing a vegetation sheet. In this specification, the "vegetation sheet" refers to a sheet-like or mat-like object that can promote the growth of plants to be vegetated by being installed on a construction target area, and is used in the meaning that it also includes, for example, a vegetation mat partially including a vegetation sheet.

Background Art

[0002] As a conventional vegetation sheet, a sheet-like thin cotton is adhered to the lower surface of a net, seeds of a target species (vegetation target) are held under this thin cotton, and it is stretched on a slope using a fixing member such as an anchor nail (Patent Document 1). In this vegetation sheet, the seeds are prevented from scattering and flowing away by the thin cotton, and due to the thin cotton having a heat preservation effect, the seeds are placed under a temperature and environment suitable for germination and growth. Also, the net surely prevents erosion of the slope due to rainfall, wind erosion, etc.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above vegetation sheet, when raw cotton (unbleached cotton) is used for the thin cotton, since the raw cotton has water repellency, the upper surface side of the vegetation sheet tends to dry, and the establishment of plant seeds, which are non-target species flying onto the vegetation sheet from the surroundings, is inhibited, resulting in a weed control effect. On the other hand, moisture such as rainwater, dew, and sprinkling water supplied to the upper surface side of the vegetation sheet is repelled by the thin cotton and it becomes difficult to penetrate to the lower surface side of the vegetation sheet, and there is a risk that the germination and growth of the target species may be delayed.

[0005] The present invention has been made in consideration of the above matters, and an object thereof is to provide a pin for fixing a vegetation sheet that can enhance the vegetation effect when used for fixing a vegetation sheet having raw cotton (unbleached cotton), and The manufacturing method and a method for fixing a vegetation sheet.

Means for Solving the Problems

[0006] In order to achieve the above object, a pin for fixing a vegetation sheet according to the present invention has a shaft portion that can penetrate the vegetation sheet in its thickness direction and holds a surfactant and has a groove extending from the proximal end side to the distal end side on the outer surface of the shaft portion (Claim 1).

[0007] In the above pin for fixing a vegetation sheet, the surfactant may be held at a portion in contact with the vegetation sheet (Claim 2).

[0008] In the above pin for fixing a vegetation sheet, the surfactant may be a nonionic surfactant (Claim 3).

[0009] In the above pin for fixing a vegetation sheet, the surfactant may be an ether type among nonionic surfactants (Claim 4).

[0010] In order to achieve the above object, the manufacturing method of the pin for fixing the vegetation sheet according to the present invention is the manufacturing method of the pin for fixing the vegetation sheet according to any one of claims 1 to 4, and realizes the retention of the surfactant by a treatment of impregnating, applying or spraying the surfactant to the pin for fixing the vegetation sheet in a state where the surfactant is not retained (Claim 5).

[0011] On the other hand, in order to achieve the above object, a method for fixing a vegetation sheet according to the present invention is to drive a pin for fixing a vegetation sheet that holds a surfactant into the vegetation sheet (Claim 6). According to any one of claims 1 to 4 (Claim 6).

[0012] In the method for fixing the vegetation sheet, the placing may be performed such that the pin for fixing the vegetation sheet presses the vegetation sheet and a depression is formed on the upper surface side of the vegetation sheet (Claim 7).

Effect of the Invention

[0013] In the present invention, a vegetation sheet having water repellency (hydrophobicity) on the surface side due to a component (such as fats and oils, lipids, etc.) removable by a surfactant being coated innately or artificially, for example, a vegetation sheet having raw cotton (unbleached cotton) at least on the surface side, when used for fixing the vegetation sheet, a pin for fixing the vegetation sheet capable of enhancing the vegetation effect and The manufacturing method and a method for fixing the vegetation sheet can be obtained.

[0014] That is, when using the pin for fixing the vegetation sheet according to the invention of each claim of the present application for fixing the vegetation sheet having raw cotton, the natural oils adhering to the surface of the cotton fibers of the raw cotton (unbleached cotton) are removed by the surfactant held by the pin for fixing the vegetation sheet, and the portion of the raw cotton from which the natural oils have been removed becomes water absorbent (hydrophilic). And the periphery of the portion of the raw cotton penetrated by the pin for fixing the vegetation sheet becomes water absorbent (hydrophilic) by the surfactant, that is, it becomes a flow path through which moisture circulates, so that the moisture supplied to the upper surface side of the vegetation sheet can easily reach the inside and the lower surface side of the vegetation sheet. By arranging seeds of the target species, etc. inside and on the lower surface side of the vegetation sheet, it becomes easier to prepare an environment suitable for the growth of the target species. Moreover, in the portions of the raw cotton other than the above-mentioned flow paths, rainwater, etc. is repelled on the upper surface side of the vegetation sheet, so the ease of drying, and thus the high weed control effect, can be maintained as it is.

[0015] In the pin for fixing the vegetation sheet according to the invention of Claim 2, it is possible to ensure the formation of a flow path for easily allowing the moisture supplied to the upper surface side of the vegetation sheet to reach the inside and the lower surface side of the vegetation sheet.

[0016] In the pin for fixing the vegetation sheet according to the invention of claim 3, since a nonionic surfactant having a property that a hydrophilic group does not dissociate into ions and having relatively low toxicity to animals and plants is used, it contributes to the realization of greening friendly to the natural environment.

[0017] In the pin for fixing the vegetation sheet according to the invention of claim 4, since an ether-type nonionic surfactant that is hardly affected by an alkali component, salts, and other ions is used, the versatility can be enhanced.

[0018] In the pin for fixing the vegetation sheet according to the invention of claim 5, moisture easily moves from the upper surface side of the vegetation sheet to the inside and the lower surface side along the groove provided on the outer surface of the shaft portion, and also, since the surfactant adheres to the groove, its holding effect is greatly enhanced.

[0019] In the method for fixing the vegetation sheet according to the invention of claim 7, the moisture supplied to the upper surface side of the vegetation sheet can be guided to the depression (recess), and the moisture guided to the depression easily reaches the lower surface side of the vegetation sheet along the outer surface of the pin for fixing the vegetation sheet placed in the depression or through the above-mentioned flow path. Therefore, even if the moisture supplied to the upper surface side of the vegetation sheet is small, the moisture can be efficiently guided to the lower surface side of the vegetation sheet.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Best Mode for Carrying Out the Invention

[0021] An embodiment of the present invention will be described below.

[0022] The method for fixing the vegetation sheet according to this embodiment is to lay (fix) a vegetation sheet S having a structure shown in FIG. 1(A) on the ground G (which is a flat ground in the illustrated example, but may also be a slope or the like) using a vegetation sheet fixing pin (hereinafter referred to as a fixing pin) P as shown in FIGS. 2(A) and (B). Then, the vegetation sheet S laid in this way exhibits a function of creating an environment that promotes the growth of the vegetation base 1 of the target species while not promoting, and thus suppressing, the growth of plants other than the target species.

[0023] The vegetation sheet S has a substantially rectangular shape in the long direction. Specifically, it has dimensions of 1 m in width and 10 m in length. By keeping it in a state of being rolled in the longitudinal direction, it is advantageous in terms of transportability and space saving during storage. As shown in FIG. 2(A), it may be unfolded when laying on the ground G. And at the time of this laying, the vegetation sheet S can be fixed by driving the fixing pins P at appropriate intervals (for example, at intervals of about 50 cm in both the vertical and horizontal directions) with respect to the periphery and the central part of the unfolded vegetation sheet S. Note that FIG. 2(B) shows a state (a part) in which a plurality of vegetation sheets S are laid side by side.

[0024] As shown in FIG. 1(A), the vegetation sheet S has, from the lower side in this order, a core 4 in which a vegetation base 1 of the target species is sandwiched between a laminated upper cotton 2 and a lower cotton 3, a fertilizer 5, a weak sheet 6, and a net-like member 7. This vertical positional relationship is in the state where the vegetation sheet S is laid on the ground, and it is not limited to this during the manufacturing, transportation, and storage of the vegetation sheet S. Also, in this example, the planar dimensions of the core 4 (upper and lower cottons 2, 3), the weak sheet 6, and the net-like member 7 during laying are made substantially the same (width 1 m, length 10 m).

[0025] Hereinafter, the configuration of the vegetation sheet S will be described in detail.

[0026] The vegetation base 1 is, for example, composed of seeds, bulbs, runners, etc. of the target species, and has functions suitable for achieving vegetation. Specifically, examples include warm-season turfgrasses such as Zoysia japonica, seeds and runners of bamboo, Miscanthus sinensis, Artemisia princeps, Lespedeza cuneata, etc. And when using, for example, the runner of Zoysia japonica, it is also conceivable to loosen the vegetation base 1 to make it turf. From the perspective of biodiversity conservation, it is preferable to use the vegetation base 1 of native plants that have been in Japan since ancient times rather than exotic plants or foreign-produced plants as much as possible.

[0027] For the upper cotton 2 and the lower cotton 3, raw cotton that has not been degreased is used.

[0028] Also, the basis weight of the upper cotton 2 is preferably made as large as possible within the limit that it does not inhibit the emergence of the vegetation base 1 of the target species, and the basis weight of the lower cotton 3 is preferably made as large as possible within the limit that it does not inhibit the rooting of the vegetation base 1 of the target species. On the other hand, the total basis weight of the upper cotton 2 and the lower cotton 3 is preferably set with the lower limit being to exert a weed control effect. Specifically, it is preferably 150 g / m 2 or more. In addition, to enhance the weed control effect and the effect of preventing pressure from weeds, it is desirable to make the total basis weight as large as possible.

[0029] Also, generally, the rooting ability is higher than the emergence ability of the vegetation base 1. Therefore, by making the basis weight of the upper cotton 2 smaller than the basis weight of the lower cotton 3, it is possible to achieve both emergence and rooting of the target species, and thus promote growth. Specifically, it is desirable to set the ratio of the basis weight of the lower cotton 3 to the basis weight of the upper cotton 2 to about 1.1 to 2.0. In this example, the basis weight of the upper cotton 2 is 85 g / m 2 , and the basis weight of the lower cotton 3 is 100 g / m 2 . However, for example, in the case of Zoysia japonica, when the basis weight of the upper cotton 2 is 200 g / m 2 and the basis weight of the lower cotton 3 is 0 g / m 2 , emergence is inhibited, but when the total basis weight of the upper and lower cottons 2 and 3 is 200 g / m 2While maintaining this, even if the ratio of the basis weight of the upper cotton 2 and the lower cotton 3 is set to 130:70, 140:60, or even 150:50 (that is, the basis weight of the upper cotton 2 is 130 to 150 g / m 2 and, correspondingly, the basis weight of the lower cotton 3 is 70 to 50 g / m 2 ), the inventors have confirmed that it can germinate stably.

[0030] And in this example, the upper cotton 2 and the lower cotton 3, both of which are in the form of rectangular sheets formed into non-woven fabrics by the needle punching method, are integrated by needle punching. During this integration (needle punching), the vegetation base 1 is arranged between the two cottons 2 and 3 so that the vegetation base 1 is sandwiched between the two laminated and integrated cottons 2 and 3, thereby constituting the core 4.

[0031] Here, when using Miscanthus seeds as the vegetation base 1, the Miscanthus seeds are oval and difficult to roll. Once arranged in a state of being substantially uniformly distributed over the entire surface between the upper and lower cottons 2 and 3, combined with the fact that the fibers of the upper and lower cottons 2 and 3 are intricately intertwined, it is difficult for the Miscanthus seeds to move between the upper and lower cottons 2 and 3 during transportation or construction. That is, it is difficult for a bias to occur in the distribution (easy to maintain the dispersed state). Therefore, it is not necessary to fix the Miscanthus seeds to the upper and lower cottons 2 and 3 by gluing or the like. However, this is not the only case. For example, the vegetation base 1 may be fixed to either one or both of the upper and lower cottons 2 and 3 by gluing or the like before the integration (needle punching) of the upper and lower cottons 2 and 3.

[0032] For the fertilizer 5, any fertilizer that is effective in promoting the growth of the vegetation base 1 may be used. In this example, it is in granular or powdery (solid) form and is adhered to one side (the upper surface) of the upper cotton 2 or the lower surface of the thin sheet 6 with an adhesive (for example, Poval). Generally, when the fertilizer is arranged in contact with the vegetation base 1 such as seeds, germination tends to be delayed. However, in this example, by arranging the upper cotton 2 between the fertilizer 5 and the vegetation base 1 as described above to physically separate the two 5 and 1, the above tendency can be weakened and the delay of germination can be prevented.

[0033] The weak sheet 6 has the function of holding the fertilizer 5 together with the core 4 (upper cotton 2) until the vegetation sheet S is installed on the ground, and has a structure (thickness, strength, gaps, basis weight) that does not inhibit the emergence of the vegetation base 1 after the vegetation sheet S is installed on the ground. And the weak sheet 6 has biodegradability, and preferably uses natural fibers or regenerated fibers made by chemically treating natural fibers instead of 100% synthetic fibers derived from petroleum. For example, paper such as crepe paper or thin cotton sheets can be used. In this example, as the weak sheet 6, a thin cotton sheet with a basis weight (20 g / m 2 ) smaller than that of either the upper cotton 2 or the lower cotton 3 is used.

[0034] As described above, it is preferable that the basis weight of the upper cotton 2 is smaller than that of the lower cotton 3. However, the weak sheet 6 compensates for the smallness of the basis weight of the upper cotton 2, thereby improving the heat retention and water retention properties of the vegetation base 1 and contributing to the improvement of the germination rate.

[0035] The net-like member 7 is provided to prevent the entire vegetation sheet S from being damaged and to prevent the entire vegetation sheet S from being turned up by the wind. It is easily deformed like the core 4 and the weak sheet 6, but is a net-like member with higher strength (tensile strength) than the core 4 and the weak sheet 6. The net-like member 7 is preferably made of a biodegradable material such as lining (formed by knitting or weaving flat yarns of 100% rayon, paper yarns, etc.) or mosquito netting (coarsely woven hemp yarns or cotton yarns), and preferably uses natural fibers or regenerated fibers made by chemically treating natural fibers instead of 100% synthetic fibers derived from petroleum.

[0036] And in this example, the weak sheet 6 is joined to the core 4 (upper cotton 2) and the net-like member 7 with an adhesive (e.g., polyvinyl alcohol). Here, while the upper cotton 2 of the core 4 is a natural fiber, if either one or both of the materials of the weak sheet 6 or the net-like member 7 are made of a synthetic fiber derived from petroleum (e.g., polyester), which is different from the upper cotton 2, the difference in the materials of the three components 2, 6, and 7 may lead to a decrease in adhesiveness, and thus the amount of adhesive required for joining the three components 2, 6, and 7 may increase. However, by making both the weak sheet 6 and the net-like member 7 of natural fibers or recycled fibers, the materials of the three components 2, 6, and 7 become the same, and it is possible to reduce the amount of adhesive used for their joining and thus reduce the environmental load.

[0037] In addition, by reducing the mesh size and wire diameter of the net-like member 7, the mutual contact area when the net-like member 7 and the weak sheet 6 are overlapped increases. Therefore, the concentration of the adhesive used for bonding the two can be reduced accordingly, and due to the action of raindrops, the weak sheet 6 is more likely to be peeled off from the net-like member 7 and closely adhere to the ground together with the core 4. Specifically, for example, it is conceivable to use, as the net-like member 7, a plain weave of 20 to 80 denier single filaments made of rayon and having a mesh size of 1 to 3 mm × 3 to 5 mm.

[0038] Incidentally, the inventors have confirmed that when a net is adhered with Poval (adhesive) on the upper side of the vegetation sheet (non-woven fabric) shown in Patent Document 1 and laid on the ground, the non-woven fabric will eventually become cardboard-like. This becoming cardboard-like refers to a phenomenon in which stretchability and flexibility are lost due to complex factors such as ultraviolet rays and temperature changes, and it becomes a brittle plate shape. Due to this becoming cardboard-like, the mesh size of the non-woven fabric becomes smaller, so the germination and root penetration of the seeds (plants) held on the lower side of the non-woven fabric are greatly impaired. Moreover, starting from the Poval existing at the boundary between the net and the non-woven fabric, the shrinkage and solidification of the non-woven fabric progress, and eventually the bulkiness of the non-woven fabric becomes smaller in the direction of the taut net (the non-woven fabric is pulled in the direction away from the ground). As a result, the seeds held on the lower side of the non-woven fabric take root, and the young and thin roots that have grown downward (taut) are cut off one by one as the non-woven fabric shrinks in the net direction, and subsequent growth may stop, and the vegetation of the vegetation target may not progress.

[0039] In this regard, in the vegetation sheet S of this example, the amount of Poval, which is considered to be one of the factors causing the cardboard-like state, can be reduced, and the upper cotton 2 and the lower cotton 3 are less likely to become cardboard-like.

[0040] Moreover, in the vegetation sheet S of this example, since the weak sheet 6 is interposed between the upper cotton 2 and the net-like member 7, even if both cottons 2 and 3 become cardboard-like, both cottons 2 and 3 (core 4) are difficult to be pulled in the direction of the net-like member 7. That is, it is easy to make both cottons 2 and 3 (core 4) adhere to the ground (easy to maintain the state of adhesion to the ground).

[0041] Also, by bringing a silicone-based or cationic softener into contact with both cottons 2 and 3 by spraying or the like, it is also possible to suppress the initial cardboard-like state itself.

[0042] In the vegetation sheet S configured as described above, the weeding effect can be enhanced by increasing the total basis weight of the upper cotton 2 and the lower cotton 3 combined. Further, the vegetation base 1 of the target species is positioned between the upper cotton 2 and the lower cotton 3. Among the upper and lower cottons, the germination target of the vegetation base is only the upper cotton, and the rooting target is only the lower cotton. Therefore, it is possible to ensure germination and rooting, and thus ensure the growth of the target species.

[0043] In addition, since the vegetation sheet S sands the vegetation base 1 of the target species with cottons 2 and 3, it has excellent heat retention properties. The high level of this heat retention property is particularly effective when the target species is, for example, Miscanthus sinensis for which relatively long-term heat retention is required even if it has been subjected to germination promotion treatment until germination.

[0044] Furthermore, the cottons 2 and 3 used for the vegetation sheet S are not chemical fibers and are white, so it is difficult to reach an excessive high temperature even under direct sunlight in summer, and it is possible to prevent the vegetation base 1 being sanded from dying due to heat. Moreover, since the cottons 2 and 3 are of natural origin, they have complete biodegradability, so there is no environmental load, and since their removal is not required, it also contributes to the reduction of management work.

[0045] In addition, since raw cotton that has not been degreased is used for the upper cotton 2 and the lower cotton 3, the degreasing process is not required compared to the case of using absorbent cotton, and a reduction in manufacturing cost can be expected. Moreover, since the raw cotton that has not been degreased is water-repellent, there is also an advantage that it is difficult for the weight to increase due to water absorption and moisture absorption of the cotton during transportation of the vegetation sheet.

[0046] Particularly when the target species for growth of the vegetation sheet S is Miscanthus sinensis, the growth of the runners of Miscanthus sinensis protected by the upper and lower cottons 2 and 3 is less likely to be inhibited by weeds, so vigorous propagation of Miscanthus sinensis can be expected.

[0047] Next, the fixing pin P will be described.

[0048] The fixing pin P in this example is a bamboo skewer. As shown in Fig. 3(A), it has a shaft portion 8 that can penetrate the vegetation sheet S in its thickness direction, and a head portion 9 provided on the base end (upper end) side of the shaft portion 8 and protruding laterally from the shaft portion 8. Further, the tip (lower end) side of the shaft portion 8 is tapered so that it is easy to penetrate the vegetation sheet S and drive it into the ground G when driving the fixing pin P.

[0049] Then, a surfactant is held on the fixing pin P. This holding can be realized by treating the fixing pin P, for example, by impregnating, applying, spraying, etc. with a liquid surfactant.

[0050] In this way, when using the fixing pin P that holds the surfactant for fixing the vegetation sheet S having raw cotton (such as cotton 2, 3, etc.), the natural oils adhering to the surface of the cotton fibers of the raw cotton (unbleached cotton) are removed by the surfactant held by the fixing pin P, and the portion of the raw cotton where the natural oils are removed will have water absorption (hydrophilicity). And the periphery of the portion of the raw cotton penetrated by the fixing pin P becomes hydrophilic due to the surfactant, that is, it becomes a flow path through which moisture flows. Therefore, the moisture supplied to the upper surface side of the vegetation sheet S can easily reach the inside and the lower surface side of the vegetation sheet S through the flow path. By arranging the vegetation base 1 of the target species on the inside and the lower surface side of the vegetation sheet S, it becomes easier to create an environment suitable for the growth of the target species. Moreover, in the portions of the raw cotton other than the above flow paths, rainwater, etc. is bounced off on the upper surface side of the vegetation sheet S, so the ease of drying, and thus the high weed control effect, can be maintained as it is.

[0051] Here, it is preferable to hold the surfactant on at least the portion of the driven fixing pin P that contacts the vegetation sheet S (for example, the base end side of the shaft portion 8 or the surface of the head portion 9 facing downward), and it is more preferable to hold it over the entire contacting portion (for example, the surfactant may be held over the entire fixing pin P). With such a configuration, it is possible to ensure the formation of a flow path for easily allowing the moisture supplied to the upper surface side of the vegetation sheet S to reach the inside and the lower surface side of the vegetation sheet S.

[0052] As the surfactant to be held by the fixing pin P, a nonionic surfactant can be considered. In this case, since the nonionic surfactant has the property that its hydrophilic group does not dissociate into ions and has relatively low toxicity to animals and plants, the merit of being able to achieve greening friendly to the natural environment can be obtained. In particular, if an ether-type surfactant among nonionic surfactants is used, the ether-type nonionic surfactant is hardly affected by alkaline components, salts, and other ions, so its versatility can be enhanced.

[0053] Further, if the fixing pin P has a groove 10 extending from the proximal end (upper end) side to the distal end (lower end) side on the outer surface of the shaft portion 8, moisture can easily move from the upper surface side of the vegetation sheet S along the groove 10 provided on the outer surface of the shaft portion 8 to its inside and lower surface side. Also, when the surfactant adheres to the groove 10, its holding effect will be greatly enhanced. The fixing pin P in this example is a bamboo skewer having a substantially sword shape (the lower part of the head 9 can be regarded as a flange) obtained by splitting bamboo longitudinally along its fiber direction, and the fibers (the unevenness due to them) running in the longitudinal direction of the fixing pin P also appear on its outer surface. Therefore, there are natural serrations, that is, a large number of grooves 10, on the outer surface of the fixing pin P. However, not limited to the grooves 10 formed by these fibers, the grooves 10 may be separately formed on the outer surface of the fixing pin P by processing.

[0054] When driving the fixing pin P, as shown in Fig. 3(B), it is preferable that the fixing pin P (its head 9) presses the vegetation sheet S so that a depression (concave portion) 11 is formed on the upper surface side of the vegetation sheet S. In this case, the moisture supplied to the upper surface side of the vegetation sheet S can be guided to the depression 11, and the moisture guided to the depression 11 can easily reach the lower surface side of the vegetation sheet S along the outer surface of the fixing pin P driven into the depression 11 or through the above-mentioned flow path. Therefore, even if the moisture supplied to the upper surface side of the vegetation sheet S is small, the moisture can be efficiently guided to the lower surface side of the vegetation sheet S.

[0055] Note that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention. For example, the following modification examples can be cited.

[0056] In the above first embodiment, as shown in Fig. 1(A), the fertilizer 5 and the weak sheet 6 are provided between the core 4 and the net-like member 7 provided above the core 4. However, the present invention is not limited to this. For example, as in the vegetation sheet S2 according to the second embodiment shown in Fig. 1(B), the fertilizer 5 and the weak sheet 6 may be provided below the core 4.

[0057] The vegetation sheets S and S2 are not limited to those having a rectangular shape as a whole, and may have, for example, a square shape or the like.

[0058] The vegetation sheets S and S2 may be manufactured by laminating and integrating each member on-site.

[0059] In the vegetation sheet S, the fertilizer 5 may be provided on the lower surface side of the core 4 (lower cotton 3), or may be provided between the upper cotton 2 and the lower cotton 3.

[0060] Also, the cottons 2 and 3 may be impregnated with a surfactant by coating or the like to impart water absorbency, thereby facilitating the creation of an environment suitable for the growth of the target species.

[0061] The vegetation sheet fixed with the fixing pin P is not limited to the vegetation sheets S and S2, and may be a vegetation sheet having other configurations. However, the fixing pin P is particularly effective when used for fixing a vegetation sheet having water repellency (hydrophobicity) on the surface side due to being inherently or artificially coated with a component (such as oil, fat, lipid) removable by a surfactant, for example, a vegetation sheet having raw cotton (unbleached cotton) at least on the surface side.

[0062] In the above embodiment, the fixing pin P is a skewer, but it is not limited to this, and other pins made of natural resin, synthetic resin, metal pins (such as anchor pins), etc. may also be used. The shape of the fixing pin P may be any shape as long as it has a shaft portion 8 and a head portion 9 protruding laterally therefrom. For example, L-shaped or T-shaped pins such as L-shaped anchor pins or T-shaped anchor pins may also be used.

[0063] Regarding the groove 10 provided in the fixing pin P, it is not limited to a straight line extending from the proximal end side to the distal end side of the fixing pin P. For example, it may be a spiral groove or a groove extending in a diamond knurl shape, etc., and the number thereof is not particularly limited. However, it is preferable that the groove 10 is provided at least over the entire circumference of the proximal end side of the shaft portion 8.

[0064] For example, as shown in FIGS. 4(A) and 4(B), the fixing pin P may have a shaft portion 8 that is generally cylindrical as a whole and has a conical shape at the lower part, and a head portion 9 that is disk-shaped with a larger diameter than the shaft portion 8. Also in this case, from the viewpoint of making it easier for moisture to move along the groove 10 from the upper surface side of the vegetation sheets S and S2 to the inside and the lower surface side thereof, as shown in FIGS. 4(A) and 4(B), it is preferable to provide the groove 10 at least around the neck portion (the entire circumference of the proximal end side of the shaft portion 8) in contact with the vegetation sheets S and S2, and it is preferable to extend the groove 10 to the seating surface of the head portion 9 (the portion in contact with the vegetation sheets S and S2).

[0065] Here, as shown in FIG. 4(C), if the groove 10 is extended to the vicinity of the lower part of the shaft portion 8, for example, in the case of a slope, it becomes possible to supply moisture to the ground deep inside, and an effect of suppressing the weakening of the surface layer of the slope due to the drying of the ground can be expected.

[0066] In order to make it easier for the fixing pin P to hold the surfactant, the surfactant may be made to have an appropriate viscosity, or the outer surface of the fixing pin P may be roughened, etc.

[0067] Needless to say, the above modification examples may be appropriately combined.

Explanation of Reference Numerals

[0068] 1 Vegetation base 2 Upper cotton 3 Lower cotton 4 Core 5 Fertilizer 6 Weak sheet 7 Net-like member 8 Shaft portion 9 Head 10 Groove 11 Depression G Ground P Pin for fixing vegetation sheet S Vegetation sheet S2 Vegetation sheet

Claims

1. A vegetation sheet fixing pin having a shaft portion capable of penetrating the vegetation sheet in its thickness direction and holding a surfactant, characterized in that a groove extending from the proximal end side to the distal end side of the shaft portion is provided on the outer surface of the shaft portion.

2. The vegetation sheet fixing pin according to claim 1, wherein the surfactant is held at a portion in contact with the vegetation sheet.

3. The vegetation sheet fixing pin according to claim 1 or 2, wherein the surfactant is a nonionic surfactant.

4. The vegetation sheet fixing pin according to claim 3, wherein the surfactant is an ether type among nonionic surfactants.

5. A method for manufacturing a vegetation sheet fixing pin according to any one of claims 1 to 4, wherein the surfactant is held by a process of impregnating, applying or spraying the surfactant onto the vegetation sheet fixing pin in a state where the surfactant is not held.

6. A method for fixing a vegetation sheet, characterized in that the vegetation sheet fixing pin according to any one of claims 1 to 4, which holds a surfactant, is driven into the vegetation sheet.

7. The method for fixing a vegetation sheet according to claim 6, wherein the vegetation sheet fixing pin presses the vegetation sheet, and the driving is performed so that a depression is formed on the upper surface side of the vegetation sheet.

Images