Plant-pest-preventing net, installation method therefor, and greening tool

Abstract

To provide a plant-pest-preventing net allowing reliable large expansion by uplift caused by growth of plants growing beneath, a method for installing the plant-pest-preventing net and a greening tool using the net.SOLUTION: A plant-pest-preventing net 3 according to the present invention has a folding portion 12 and is laid in a state allowing slack, where a first fold 8 formed below the folding portion 12 is arranged so as to remain at a position shifted in a direction for releasing the folding.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a feeding-prevention net that is laid on a vegetation target surface in order to construct a greening structure that can promote greening while preventing feeding damage by animals, a method for installing the same, and a greening tool. [Background technology]

[0002] The device for preventing damage caused by herbivores, disclosed in Patent Document 1, covers a protected area (e.g., a vegetated area) with a net and uses spacers to position the net above the vegetation surface. This device is highly effective in preventing damage caused by herbivores and has come into widespread use, but it has problems such as the large number of parts required, high cost, and labor-intensive installation.

[0003] Therefore, as shown in Figure 9(A), it is possible to cover the surface of the protected area A with a feeding-prevention net 52 having two folding sections 51 extending in the longitudinal direction, and at this time, the folding sections 51 are left folded rather than unfolded, and anchor pins 53 are driven at appropriate intervals as shown in the same figure (B) into two long sides 52a and 52c of the four sides 52a to 52d (52a and 52c are long sides, and 52b and 52d are short sides) of the net 52, which is rectangular in plan view, and into a central section 52e located between the two folding sections 51 (at a position equidistant from the two long sides 52a and 52c) and extending parallel to the two long sides 52a and 52c.

[0004] In other words, if the seeds of the plants to be planted that are placed in the protected area A before or after the installation of the net 52 grow and successfully push up the two folding sections 51 of the net 52, the net 52 will expand greatly as shown in Figure 9 (C) (the further the sections from the two long sides 52a and central section 52b where the anchor pins 53 are driven in, the higher they will float above the surface of the protected area A), and in this case, unlike the device of Patent Document 1 mentioned above, spacers will not be required.

[0005] If the net 52 expands due to being lifted up by the plants growing below, the plants in the protected area A will have more freedom to grow well, and it will also be more difficult for predatory animals such as deer to invade the protected area A, which will be advantageous in preventing predation. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 3793524 Summary of the Invention [Problem to be solved by the invention]

[0007] However, with the above method, if a plant grows through the folded portion 51 (the portion folded to form the triple net portion) in the folded state shown in Figure 9(B), the plant may keep the folded portion 51 folded and not release it, resulting in a phenomenon in which the net 52 does not expand much even when the plant grows. Therefore, if a flat net 52 without folding portions 51 is used, the net 52 will not be able to expand significantly when lifted up by the growing plants.

[0008] The present invention has been made with the above-mentioned matters in mind, and its object is to provide a feeding damage prevention net that can be reliably inflated by being lifted up by plants growing below it, as well as a method for installing the feeding damage prevention net and a greening tool using the same. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the feeding damage prevention net of the present invention is a feeding damage prevention net having a folding section and laid out in a loose state, and is laid out so that the fold formed on the underside of the folding section remains in the position where it is moved in the direction of unfolding (Claim 1).

[0010] On the other hand, in order to achieve the above-mentioned object, the method of installing a feeding damage prevention net according to the present invention is a method of installing a feeding damage prevention net having a folding portion in a state in which it can slacken, and the feeding damage prevention net is installed so that the fold formed on the underside of the folding portion remains in the position where it is moved in the direction of unfolding (Claim 2).

[0011] On the other hand, in order to achieve the above-mentioned object, the greening tool of the present invention is a greening tool in which the feeding damage prevention net described in claim 1 is integrated with a sheet-like or mat-like vegetation in a loose state, and can be wound up into a roll (claim 3). [Effects of the Invention]

[0012] The present invention provides a feeding damage prevention net that can be reliably inflated by being lifted up by plants growing below it, as well as a method for installing the feeding damage prevention net and a greening tool that uses the same.

[0013] In other words, in the inventions claimed in each claim of this application, the folds formed on the underside of the folding portion of the feeding damage prevention net are laid so that they remain in the position where they are moved in the direction of unfolding.Therefore, when plants grow from below the laid feeding damage prevention net, the plants penetrate the folding portion, causing the folding portion to remain folded, and the feeding damage prevention net does not float much even when the plants grow.This prevents this phenomenon from occurring, and the feeding damage prevention net can be reliably inflated to a large size by being lifted up by the plants growing below.

[0014] The greening tool of the invention according to claim 3 can be rolled up and easily unfolded when laying it on a slope by simply holding one end and rolling it from the top of the slope to the bottom of the slope, which contributes to improving workability. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is an exploded perspective view showing a schematic configuration of a greening tool according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing a schematic configuration of the greening tool. [Figure 3] 3(A) to 3(C) are explanatory views schematically showing a method for manufacturing the greening tool. [Figure 4] FIG. 1A is an explanatory diagram showing the outline of the process at the start of laying the greening tool, and FIG. 1B is an explanatory diagram showing the greening tool after some time has passed since it was laid. [Figure 5] 1(A) to 1(C) are explanatory views showing the steps of laying the greening tool. [Figure 6] 1(A) and 1(B) are explanatory views showing the state of the greening tool when it is laid down and after it has been laid down. [Figure 7] 10(A) and 10(B) are perspective views showing the change over time of the greening tool after installation. [Figure 8] (A) and (B) are explanatory diagrams of the feeding damage prevention net in an unfolded state and when the folding section is formed, and (C) and (D) are explanatory diagrams of the feeding damage prevention net in states where the width of the folding section is narrowed and widened. [Figure 9] 1(A) to 1(C) are explanatory diagrams showing a conventional method for installing a greening tool. DETAILED DESCRIPTION OF THE INVENTION

[0016] An embodiment of the present invention will be described below.

[0017] The greening tool 1 shown in Figures 1 and 2 is laid on a target surface for vegetation in order to construct a greening structure that can promote greening while preventing damage from animals. Here, the target surface for vegetation refers to a surface (construction site) that is to be greened by vegetation, such as the slope of a road or mountainside, riverbed, riverbank, or lakeshore.

[0018] The following describes the case where the greening tool 1 of this example is laid on a slope N (an example of a vegetation target surface) as shown in Figure 6(A). For convenience, in the following description, one greening tool 1 is laid on the slope N, but it goes without saying that multiple greening tools 1 may be laid, for example, lined up vertically or horizontally.

[0019] As shown in Figures 1 and 2, the greening tool 1 integrally comprises a vegetation mat (an example of vegetation) 2 and a feeding prevention net 3 that forms a plant growth space S (see Figures 6(A) and (B)) above the vegetation mat 2.

[0020] As shown in Figure 1, the vegetation mat 2 comprises a sheet 4 that is approximately rectangular in plan view, and a net 5 that is approximately the same size as the sheet 4 and holds the sheet 4 on its underside (the side facing the slope N when the greening tool 1 is laid on the slope N), and as a whole has an approximately rectangular shape in plan view.

[0021] The sheet 4 is made of thin cotton such as staple fiber and is attached to the underside of the net 5 by pasting or the like. The underside of the sheet 4 is designed to hold seeds a of greening plants P (see FIG. 6(B)), such as herbaceous plants of grass such as tall fescue. This holding can be achieved, for example, by adhering the seeds a to the sheet 4 using a water-soluble glue. In general, using herbaceous plants is preferable in terms of increasing the green coverage rate in the early stages of construction, and is advantageous in that herbaceous plants can be greened quickly, allowing for early recovery of vegetation.

[0022] The net 5 is a flexible net with a mesh size that allows the seeds a of the plant P to germinate, and is formed into a grid shape using corrosion-resistant synthetic resin fibers such as polyethylene, nylon, polyester, and aramid, biodegradable synthetic resin fibers such as polylactic acid, plant fibers such as palm, hemp, and straw, and paper.

[0023] The net 5 is provided with a plurality of cylindrical storage sections 6 extending in the short direction at appropriate intervals along its length, and a long fertilizer bag 7 is inserted into each storage section 6. The fertilizer bag 7 is made of, for example, nonwoven fabric and contains a vegetation substrate b such as organic material, water-retaining material, and fertilizer.

[0024] On the other hand, the feeding damage prevention net 3 has a generally rectangular shape in a plan view as shown in Fig. 1, and is integrated with the unfolded vegetation mat 2 in a state that allows it to sag relative to the vegetation mat 2. The feeding damage prevention net 3 in this example has approximately the same length (longitudinal dimension) as the vegetation mat 2, and is wider (larger in the lateral dimension) than the vegetation mat 2. Two long sides 3a and 3c of the four sides 3a to 3d (3a and 3c are long sides, 3b and 3d are short sides) of the feeding damage prevention net 3 are integrated with two long sides 2a and 2c of the four sides 2a to 2d (2a and 2c are long sides, 2b and 2d are short sides) of the vegetation mat 2, and are not integrated with other parts; this integration method will be described in detail later.

[0025] The fibers constituting the feeding damage prevention net 3 are, for example, monofilaments made of synthetic resin and flat yarns made of synthetic resin that are thicker than the monofilaments, which are connected in the vertical (warp) or horizontal (weft) directions and knitted into a roughly rectangular shape when viewed from above, resulting in a flexible net with, for example, a grid-like mesh.

[0026] A synthetic resin net containing a repellent, or a synthetic resin net or metal net coated with a repellent may be used as the feeding damage prevention net 3. The feeding damage prevention net 3 may be finished in the form of a knitted fabric or a woven fabric.

[0027] 1, the feeding damage prevention net 3 is provided with a rope (an example of a linear body) R that passes through a central portion 3e in the short direction of the net when it is unfolded (a portion that is equidistant from the short sides 3b, 3d and extends parallel to the short sides 3b, 3d). This rope R may be integrated with the feeding damage prevention net 3 by means of sewing, gluing, or the like, or may be integrated simply by passing the rope R through the meshes.

[0028] Then, as shown in Figures 3(A) to (C), the feeding damage prevention net 3 is folded and integrated with the vegetation mat 2, thereby obtaining the greening tool 1 shown in Figure 2. Figures 3(A) to (C) show the feeding damage prevention net 3 as seen from the direction of A in Figure 1.

[0029] That is, as shown in Figures 3(A) and (B), first, the feeding damage prevention net 3 is folded in half so that the central portion 3e (where the rope R is attached) forms the first fold 8. This folding creates a double net consisting of a lower portion 9 and an upper portion 10 that folds over the lower portion 9. Next, as shown in Figures 3(B) and (C), the upper portion 10 is folded back so that a position appropriately spaced from the first fold 8 forms the second fold 11.

[0030] As a result of the above folding, a folded portion 12 is formed in the center of the widthwise direction of the feeding damage prevention net 3, where the net is folded over to form a triple net portion and extends in the lengthwise direction of the feeding damage prevention net 3. Accordingly, the lower portion 9 can be divided into a folded lower portion 9a that extends from the first fold 8 to a position directly below the second fold 11 and forms the folded portion 12, and an unfolded lower portion 9b that extends from a position directly below the second fold 11 to one end (long side portion 3c) of the feeding damage prevention net 3 in the widthwise direction and protrudes from the folded portion 12. The upper portion 10 can be divided into a folded middle portion 10a which extends from the first fold 8 to the second fold 11 and constitutes the folded portion 12, a folded upper portion 10b which extends from the second fold 11 to a position directly above the first fold 8 and constitutes the folded portion 12, and a non-folded upper portion 10c which extends from a position directly above the first fold 8 to the other end (long side portion 3a) of the feeding damage prevention net 3 in the short direction and protrudes from the folded portion 12.

[0031] Then, the two long sides 3a, 3c of the folded anti-feeding net 3 are integrated with the two long sides 2a, 2c of the vegetation mat 2 (see Figure 3(C)), thereby obtaining the greening tool 1 shown in Figure 2.

[0032] Possible means for integrating the vegetation mat 2 and the feeding damage prevention net 3 include sewing, adhesive bonding, heat sealing, stapling, etc. The integration of the two 2, 3 may be performed, for example, by a continuous linear joint or by intermittent point joints. The integration of the two 2, 3 may also be performed so that the long side portions 2a, 2c and the long side portions 3a, 3c are aligned exactly at their edges, or so that one edge extends outward beyond the other edge; in this example, the long side portions 2a, 2c are integrated so that they extend slightly outward beyond the long side portions 3a, 3c, respectively.

[0033] If the greening tool 1 is rolled up in advance, for example, in the longitudinal direction, it can be easily unfolded by simply holding one end and rolling it from the top of the slope to the bottom of the slope, as shown in Figure 6(A), which contributes to improving workability. Furthermore, the feeding damage prevention net 3 is integrated with the unfolded vegetation mat 2 in a state that allows it to slacken. If the greening tool is carelessly rolled up without providing the folding section 12 as described above, undesirable wrinkles will form in the feeding damage prevention net 3. As a result, stress will be concentrated in parts of the rolled greening tool, causing deterioration or breakage, the rolled greening tool 1 will be bulky, and wrinkles in the feeding damage prevention net 3 will engage with each other, hindering the unfolding work. However, the greening tool 1 of this example, which has the folding section 12 as described above, makes it difficult for undesirable wrinkles to form in the feeding damage prevention net 3, thereby preventing the occurrence of the above-mentioned problems.

[0034] The greening tool 1 configured as described above is laid (stretched) on a slope N (protected area A) whose surface has been leveled as necessary (see Figures 4(A) and 6(A)). The area on the slope N where the greening tool 1 is laid becomes the protected area A that the greening tool 1 is to protect.

[0035] During this installation, the greening tool 1 is placed on the slope N with the vegetation mat 2 on the bottom and the feeding damage prevention net 3 on the top, and then the feeding damage prevention net 3 is first moved in the direction to unfold (to the right in the illustrated example) the first fold 8 formed on the bottom of the folding section 12 as shown in Figure 5(A). In this example, the first fold 8 is moved to the center position in the short (left-right) direction of the vegetation mat 2 (protected area A) (see Figure 5(B)), and this moving operation can be easily performed using the rope R attached at the position of the first fold 8.

[0036] 5(C), anchor pins 13 are driven into the two long sides 3a, 3c and the central part 3e (first fold 8) of the feeding damage prevention net 3 at appropriate intervals to serve as a fixing means that penetrates the greening tool 1 (the vegetation mat 2 and the feeding damage prevention net 3), thereby fixing the greening tool 1 to the slope N (protected area A) and completing the installation. In other words, the first fold 8 is installed so that it remains in the position where it was moved in the direction of unfolding (to the right in the illustrated example) as described above.

[0037] As shown in Figure 4(B), anchor pins 13 are preferably driven near both ends of the slope-side edge 1a and the slope-side edge 1b of the greening tool 1 (i.e., the four corners of the greening tool 1). In the illustrated example, anchor pins 13 are driven near both ends and the center of each edge 1a, 1b. Furthermore, since the fertilizer bags 7 are relatively heavier than the other components of the greening tool 1 and are prone to shifting due to gravity, anchor pins 13 are driven through (anchoring) each fertilizer bag 7 near both ends in the longitudinal direction and near the center. As a result, anchor pins 13 are driven at appropriate intervals into the two long sides 3a, 3c and the center 3e of the pest damage prevention net 3. However, the present invention is not limited to this. For example, the anchor pins 13 may be driven not through the fertilizer bag 7 but at a position slightly offset from the fertilizer bag 7 toward the toe of the slope, and the fertilizer bag 7 may be held from the toe of the slope. In this case, the head of the anchor pin 13 may be bent toward the slope shoulder and driven so that the head presses the fertilizer bag 7 against the slope N, thereby enabling the fertilizer bag 7 to be held stably. Furthermore, anchor pins 13 that are driven through the fertilizer bag 7 and anchor pins 13 that do not penetrate the fertilizer bag 7 but hold it from the toe of the slope may be used in combination.

[0038] The anchor pin 13 may be driven into the central portion 3e (first fold 8) by, for example, providing a through-hole in the rope R for passing the anchor pin 13 therethrough so that the anchor pin 13 passes through the rope R, or by not having the anchor pin 13 pass through the rope R but instead having the head of the anchor pin 13 press down on the rope R. Furthermore, since the rope R is integrated with the feeding damage prevention net 3, it is not necessary to directly fix or hold the rope R with the anchor pin 13.

[0039] Here, when transporting and laying the greening tool 1 on the slope N, if the fertilizer bags 7 are inserted and held in each storage section 6 in advance, the labor required for laying the tool can be reduced. However, it is also possible to transport the greening tool 1 onto the slope N without the fertilizer bags 7, and then insert and hold the fertilizer bags 7 in the storage sections 6. In this case, the weight of the greening tool 1 can be reduced, thereby reducing the labor required for transportation.

[0040] In the greening tool 1 of this example, the feeding damage prevention net 3 has a plurality of mesh sizes that are different from one another. That is, when the greening tool 1 is fixed to a slope N as shown in FIG. 6(A), the vegetation mat 2 can promote and ensure the growth of plants P on the slope N, as shown in FIG. 6(B). The feeding damage prevention nets 3 above the vegetation mat 2 have mesh sizes that are different from one another, and the different mesh sizes are set so that areas that are relatively difficult for plants P growing below them to pass through and areas that are relatively easy for plants P to pass through are formed. This allows plants P growing in the relatively difficult-to-pass areas to lift the feeding damage prevention net 3, forming a plant growth space S (a space that prevents attacks by feeding animals such as deer and is free of obstacles to plant growth), while plants P growing in the relatively easy-to-pass areas and passing through the feeding damage prevention net 3 actively reduce the exposed area of ​​the feeding damage prevention net 3, improving the appearance (creating a natural and beautiful landscape). In this case, since the feeding damage prevention net 3 is raised from the slope N, the plants P have more freedom to grow well, and since the feeding damage prevention net 3 is raised from the slope N, it becomes difficult for feeding animals such as deer to invade the slope N. It is also possible to eliminate the need for parts and labor just for forming the plant growth space S.

[0041] Specifically, as shown in FIGS. 1 and 6(A), the feeding damage prevention net 3 has sparse sections 14 with large mesh sizes and dense sections 15 with small mesh sizes alternately arranged in the longitudinal direction. For example, if the plants P growing on the slope N to which the greening tool 1 is fixed pass through the sparse sections 14 to a certain extent without passing through the dense sections 15, the plants P that pass through the sparse sections 14 will add a natural look to the landscape, improving the appearance of the greening tool 1. At the same time, the dense sections 15 are lifted up by the plants P, thereby expanding the plant growth space S. As shown in FIG. 6(A), by arranging the dense sections 15 so that they occupy a certain range from directly above each fertilizer bag 7 toward the slope (for example, an area approximately two to three times the area occupied by each fertilizer bag 7 in plan view), the feeding damage prevention net 3 can be lifted up by the plants P, thereby ensuring the expansion of the plant growth space S.

[0042] As a method of providing sparse portions 14 and dense portions 15 in the feeding damage prevention net 3, for example, a net with a constant mesh size may be partially joined to a net with a finer mesh size (in this case, the joined portions become dense portions 15 and the unjoined portions become sparse portions 14), or the size of the mesh may be changed by partially changing the knitting method or weaving method (so that one net has sparse portions 14 and dense portions 15).

[0043] For example, in areas with a high deer density, plants P that pass through the sparse sections 14 are easily eaten by the deer, and in the first year after installation, there is a tendency for the area above the dense sections 15 that is not covered by the plants P (young grass) that have passed through the sparse sections 14 to be relatively large; however, two or three years after installation, deer have the habit of no longer preferring to eat the plants P as much as the young grass of the first year, meaning that the area above the dense sections 15 that are covered by the plants P that have passed through the sparse sections 14 becomes larger over time, and even from the long-term perspective of plant succession, it can be said that the greening tool 1 of this example can be expected to have a positive effect on the landscape.

[0044] After the greening tool 1 configured as described above is laid on the slope N, the plants P grow and the feeding damage prevention net 3 expands significantly as shown in Figures 4(B) and 7(A) (the further the anchor pins 13 are from the two long side portions 3a, 3c and the central portion 3e, the higher it floats above the surface of the protected area A). This results in two plant growth spaces S extending in the longitudinal direction of the greening tool 1 (feeding damage prevention net 3) lined up in the lateral direction. After some time has passed, many plants P will protrude from the rough portions 14 as shown in Figure 7(B).

[0045] In the greening tool 1 and its installation method of this example configured as described above, the feeding damage prevention net 3 is integrated with the unfolded vegetation mat 2 in a state where it can sag relative to the vegetation mat 2. Therefore, when the greening tool 1 is fixed to the slope N, the plants P growing on this slope N will lift the feeding damage prevention net 3 and form a plant growth space S. Because the feeding damage prevention net 3 is in a state where it can sag relative to the vegetation mat 2, there is more room for the plant growth space S to expand. If the feeding damage prevention net 3 is lifted higher from the slope N, the plants P will have a greater degree of freedom and will be able to grow well. Furthermore, if the feeding damage prevention net 3 floats higher from the slope N, it is expected that the effect of preventing feeding animals such as deer from invading the slope N will be enhanced.

[0046] Moreover, in the greening tool 1 and its installation method of this example, by providing the foldable portion 12 on the feeding damage prevention net 3, there is more room for the plant growth space S to expand, and the feeding damage prevention net 3 is laid so that the first fold 8 formed on the underside of the foldable portion 12 remains in the position where it is moved in the direction of unfolding (see Figures 5(A) to (C)). Therefore, when plants P grow from below the laid feeding damage prevention net 3, the plants P penetrate the foldable portion 12, causing the foldable portion 12 to remain folded, which prevents the feeding damage prevention net 3 from floating much even as the plants P grow, and the feeding damage prevention net 3 can be reliably lifted up by the plants P growing below it, allowing it to inflate reliably. Furthermore, once the greening tool 1 is laid, it relies solely on the growth of the plants P, so maintenance is almost unnecessary.

[0047] Furthermore, since the greening tool 1 of this example integrally comprises the vegetation mat 2 and the feeding prevention net 3 for forming the plant growth space S above the vegetation mat 2, by fixing this greening tool 1 to the slope N, the vegetation mat 2 is fixed to the slope N and the feeding prevention net 3 is laid above the vegetation mat 2 at the same time, improving workability. Furthermore, if the feeding prevention net 3 were separate from the vegetation mat 2, the individual sizes of the plant growth spaces S formed by the feeding prevention net 3 would easily vary, but by integrating the feeding prevention net 3 with the vegetation mat 2 in advance, it is easy to reduce such variation, which ultimately contributes to the realization of uniform and effective animal damage control measures.

[0048] As described above, the greening tool 1 of this example is configured so that two plant growth spaces S extending in its longitudinal direction are lined up in the lateral direction (see Figures 4(B), 7(A) and (B)). It is preferable that the sizes of these two plant growth spaces S are approximately the same, and for this reason, when laying the tool, the first fold 8 is moved to the center position in the lateral (left-right) direction of the vegetation mat 2 (protected area A) (see Figures 5(A) and (B)). This moving operation can be performed accurately and easily by using the position of the second fold 11 formed on the upper side of the folding section 2 as a guide, since the position of the second fold 11 is approximately at the center position (details will be described later).

[0049] The fact that the position of the second fold 11 is approximately at the center position (the center position in the short direction of the vegetation mat 2) will be explained below with reference to Figures 8(A) and (B). Note that the feeding damage prevention net 3 shown in Figures 8(A) and (B) shows the feeding damage prevention net 3 as seen from the direction A in Figure 1, similar to the feeding damage prevention net 3 shown in Figures 3(A) and (C).

[0050] 8(A) and (B), the width of the feeding damage prevention net 3 in the short (left-right) direction before folding is 2W (=W×2), half of that width is W, and the width of the folding section 12 (the folding lower section 9a, the folding middle section 10a, and the folding upper section 10b shown in FIG. 3(C)) is x. The sum of the width (x) of the folding lower section 9a and the width of the non-folding lower section 9b is the half width (W), so the width of the non-folding lower section 9b is (Wx). Also, the sum of the width (x) from the first fold line 8 to the second fold line 11 and the width from the second fold line 11 to the long side section 3a is the half width (W), so the width from the second fold line 11 to the long side section 3a is (Wx). This means that the second fold 11 is located equidistant (Wx) from the long sides 3a and 3c, i.e., at the center position in the short direction of the feeding damage prevention net 3 when the folding section 12 is provided, or in other words, at approximately the center position in the short direction (left and right) of the vegetation mat 2 (protected area A). The width in the short direction of the feeding damage prevention net 3 when the folding section 12 is provided is 2W-2x (=2(Wx)).

[0051] As shown in Figures 8(C) and (D), when the width x of the folding portion 12 changes, the width (2W-2x) in the short direction of the feeding damage prevention net 3 when the folding portion 12 is provided also changes; however, as long as the first fold 8 is located in the center of the short direction of the feeding damage prevention net 3 when it is unfolded, and the net is folded in half at this first fold 8, and the upper portion 10 is folded back so that the second fold 11 is located at a position appropriately distanced from the first fold 8, and this folded back upper portion 10 extends to a position beyond the first fold 8, the second fold 11 will always be located in the center of the short direction of the feeding damage prevention net 3 when the folding portion 12 is provided (at the same time, the first fold 8 will always be located in a position shifted from the center of the short direction of the feeding damage prevention net 3 when the folding portion 12 is provided). It is possible that the second fold 11 may be slightly displaced from the center position due to the thickness of the feeding damage prevention net 3, but the effect is limited.

[0052] The width of the folding portion 12 (the width in the short direction of the anti-feeding net 3) can be determined according to the size of the plant growth space S to be formed, the type of plant P expected to grow in the protected area A, the height of the plants after growth, etc., and it can be considered, for example, that the width is 1 / 20 to 1 / 5 of the width in the short direction of the anti-feeding net 3 in the unfolded state.

[0053] As described above, by laying the revegetation tool 1 on the slope N, the seeds a are prevented from scattering or being washed away by the sheet 4, and the sheet 4, which is made of thin cotton with heat-retaining properties, places the seeds a in a temperature and environment suitable for germination and growth. In addition, the feeding damage prevention net 3 and net 5 reliably prevent erosion of the slope N due to rainfall, wind erosion, etc.

[0054] As time passes, the seeds a in the vegetation mat 2 germinate, and the plants P that hit the feeding damage prevention net 3 in the plant growth space S grow in a bent state. As the plants P grow, the feeding damage prevention net 3 begins to lift up early on, and continues to lift up as the plants P grow (see Figure 6(B)), and eventually the plants P propagate in the plant growth space S.

[0055] In the greening structure constructed by laying the greening tools 1 on the slope N as described above, the feeding damage prevention net 3 is supported by flexible plants P and is raised above the slope N, making it unstable when feeding animals such as deer walk on it, making it difficult for feeding animals such as deer to invade the slope N, and even if they do invade the slope N, most of the plants P grow within the plant growth space S protected by the feeding damage prevention net 3, so there is no risk of them being eaten up by feeding animals.This is a feeding damage prevention method.

[0056] In this way, in a greening structure constructed using the greening tools 1, the feeding damage prevention net 3 is lifted off the slope N by utilizing the growth force of the plants P growing in the plant growth space S directly below the feeding damage prevention net 3, without using a separate spacer such as a coil spring. For this reason, the feeding damage prevention net 3 is arranged in a sagging state above the slope N, forming the plant growth space S in which the plants P can grow in a bent state below the feeding damage prevention net 3. However, in order to strike a balance between being able to use the growth force of the plants P to lift off (lift) the feeding damage prevention net 3 off the slope N and not damaging the growth environment of the plant growth space S so that the plants P can grow healthily, it is preferable to appropriately set the lower limit of the mesh area of ​​the feeding damage prevention net 3. This is because if the mesh size of the feeding prevention net 3 is too small, the breathability, water permeability and light transmittance will be insufficient, which will damage the growth environment of the plant growth space S and prevent the plants P from growing healthily.

[0057] Furthermore, it is necessary to not only prevent the mouths of predators such as deer from entering the plant growth space S formed between the slope N and the feeding damage prevention net 3, but also to prevent the claws of predators such as deer from entering the plant growth space S (even if they do enter, they should only enter partway), and for this reason it is preferable to appropriately set an upper limit on the mesh area of ​​the feeding damage prevention net 3. This is because if the mesh size of the feeding damage prevention net 3 is too large, the claws of predators such as deer can freely insert through it, and they may end up pulling the plants P growing in the plant growth space S with their claws.

[0058] The preferable upper and lower limits of the mesh area of ​​the feeding damage prevention net 3 described above vary depending on the type of plants P grown in the plant growth space S. For example, if the plants P grown in the plant growth space S are herbaceous plants, and the feeding damage prevention net 3 is a fine mesh net that inhibits the growth of woody plants, and the plants P do not include woody plants such as trees that are taller than the herbaceous plants, the mesh area of ​​the feeding damage prevention net 3 should be set to 0.25 mm. 2 (Lower limit) ~ 100mm 2In this case, if the length and width of the mesh are the same, the length can be selected to be in the range of 0.5 mm to 10 mm. In other words, if the length is 0.5 mm, the area of ​​the mesh is 0.25 mm. 2 (0.5mm x 0.5mm), and in the case of 10mm, the mesh area is 100mm 2 However, the feeding damage prevention net 3 may be a net with different vertical and horizontal mesh lengths, for example, a blind-like net with mesh consisting of long and short sides, which is also used in general vegetation mats. In this case, even if the long side of the mesh is far greater than 10 mm, for example, 50 mm, and the short side is 2 mm, the mesh area is 100 mm. 2 (50mm x 2mm). The mesh area of ​​the feeding damage prevention net 3 is 1.0 to 30mm. 2 It is more preferable that:

[0059] From the viewpoint of protecting the plants P with the feeding damage prevention net 3, it is preferable that the mesh size of the feeding damage prevention net 3 is small so that the plants P do not pass through. However, if the mesh size of the feeding damage prevention net 3 is set to a size that allows a part of the plants P to pass through and get out (for example, if the mesh area is 30 mm 2 Even if the height of the plant P is increased (even if the height is increased), if the growing point of the plant P is positioned within the plant growth space S, it is possible to realize a method of preventing damage to the plant P through the symbiosis of predatory animals and the plant P. This is because, in the case of herbaceous plants, for example, plants P consisting of grasses such as tall fescue, the part above the growing point 2 cm above the ground (2 cm above the surface of the slope N) can still be regenerated even if it is eaten.

[0060] It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the following modifications can be mentioned.

[0061] In the above embodiment, the vegetation mat 2 is used as the vegetation, but the present invention is not limited to this, and for example, the following (1) and (2) may be used as the vegetation. (1) A vegetation sheet constructed by sandwiching greening materials (including vegetation substrates such as soil conditioners, water-retaining materials, fertilizers, and organic materials, as well as plant seeds) between two sheets, or by fixing (holding) them on the upper or lower surface of a sheet. Here, the sheet is made of, for example, thin cotton wrap, nonwoven fabric, paper, etc., and may be, for example, a water-degradable sheet that dissolves (disperses) easily in water, or a sheet made of biodegradable fibers. (2) A vegetation mat constructed by bonding the vegetation sheet of (1) to a net or the like. This can comprise a sheet (thin cotton) 4 that holds at least one vegetation substrate b, such as a soil conditioner, water-retaining material, fertilizer, or organic material, and plant seeds a, at the bottom, and a net 5 that holds the sheet 4 on the underside. Note that instead of the vegetation sheet of (1), it is possible to hold a so-called laid turf body, in which at least one vegetation substrate b is sandwiched between thin materials along with plant seeds a, on the underside of the net 5.

[0062] In the above embodiments and (1) and (2), the constituent materials of the sheet 4, fertilizer bag 7, and turf layer can be natural fibers such as cotton, silk, and hemp, which are decomposed and decayed by microorganisms such as bacteria and disappear over time, regenerated fibers such as viscose rayon made from regenerated cellulose, or even decomposable fibers alone or blended fibers consisting of decomposable fibers and synthetic fibers.

[0063] It is also possible to introduce plants from vegetation seeds (seed bank) to slope N by collecting seeds a from a seed bank (for example, a forest floor) along with soil near slope N and storing them in a sheet 4 or in a fertilizer bag 7. In this case, by using vegetation seeds (seed bank) in combination with herbaceous seeds a (vegetation species), it is possible to quickly revegetate slope N while achieving natural restoration that is suited to the local landscape.

[0064] In the above embodiment of the greening tool 1 shown in Figure 4(B) etc., the feeding damage prevention net 3 is integrated with the vegetation mat 2 in a state where it has only one folding section 12 extending in its longitudinal direction (see Figure 4(A)) so that two plant growth spaces S extending in the longitudinal direction of the rectangular vegetation mat 2 can be formed side by side in the short direction. However, this is not limited to this, and for example, the feeding damage prevention net 3 can be integrated with the vegetation mat 2 in a state where it has multiple folding sections 12 extending in its longitudinal direction and spaced apart in the short direction, making it possible to form plant growth spaces S in a number one more than the number of folding sections 12 lined up in the short direction of the vegetation mat 2.

[0065] In the above embodiment of the greening tool 1, a folding section 12 extending in the longitudinal direction of the anti-feeding net 3 is provided, but instead of this folding section 12, a folding section 12 extending in the short direction of the anti-feeding net 3 may be provided, in which case plant growth spaces S extending in the short direction of the vegetation mat 2 can be formed by arranging them in the longitudinal direction.

[0066] In the greening tool 1 of the above embodiment, the vegetation mat 2 and the feeding damage prevention net 3 are integrated at both ends (long sides 2a, 3a and long sides 2c, 3c) in the short direction (folding direction), but this is not limiting, and for example, the vegetation mat 2 and the feeding damage prevention net 3 may be integrated only at one side, in which case it is possible to simplify the structure and reduce the amount of work required to integrate the vegetation mat 2 and the feeding damage prevention net 3. In this case, when fixing the greening tool 1 to a slope N or the like, if anchors are driven into one side and the other side of the vegetation mat 2 and the feeding damage prevention net 3, the vegetation mat 2 and the feeding damage prevention net 3 will be integrated not only at one side but also at the other side, thereby ensuring the formation of the plant growth space S.

[0067] The arrangement of the sparse portions 14 and the dense portions 15 can be changed in various ways; for example, the positions of the sparse portions 14 and the dense portions 15 may be swapped, or both portions 14, 15 may extend in the longitudinal direction of the feeding damage prevention net 3 rather than the lateral direction, or one of the portions 14, 15 may be scattered relative to the other in a matrix pattern, or both portions 14, 15 may be arranged in a checkerboard pattern.

[0068] In the greening tool 1 of the above embodiment, the mesh size of the feeding damage prevention net 3 is set to two levels, large and small, and two regions, sparse sections 14 and dense sections 15, are provided accordingly. However, this is not limited to this. For example, the mesh size of the feeding damage prevention net 3 may be changed to three or more levels, and at least one of the sparse sections 14 and dense sections 15 may be provided in multiple types depending on the mesh size. However, it is preferable to ensure that the feeding damage prevention net 3 is partially covered by plants P that pass through at least the section with the largest mesh size, as this ensures improved appearance. It is also preferable to ensure that plants P do not pass through at least the section with the smallest mesh size of the feeding damage prevention net 3, or that if they do, the amount of passing through is less than that of the section with the largest mesh size, as this makes it easier for plants P to lift the feeding damage prevention net 3 and form and expand the plant growth space S.

[0069] In the greening tool 1 of the above embodiment, one feeding damage prevention net 3 is integrated with one vegetation mat 2, but this is not limiting, and for example, multiple feeding damage prevention nets 3 may be integrated with one vegetation mat 2. Also, the vegetation mat 2 and the feeding damage prevention net 3 may be separate entities rather than integrated in advance, and the two 2, 3 may be integrated by, for example, driving anchor pins 8 (at the site) during construction (the feeding damage prevention net 3 is laid after the vegetation mat construction).

[0070] Alternatively, instead of using the vegetation mat 2, the feeding damage prevention net 3 may be laid in a subsequent process after the vegetation base material spraying work on the vegetation target surface such as the slope N.

[0071] The revegetation tool 1 can also be applied within a lattice-shaped slope frame constructed as a protective work on the surface of a slope.

[0072] It goes without saying that the modifications given in this specification may be combined as appropriate. [Explanation of symbols]

[0073] 1 Greening tools 1a, 1b edge 2. Vegetation mat 2a~2d: Four sides (2a and 2c are long sides, 2b and 2d are short sides) 3. Netting to prevent pest damage 3a~3d: Four sides (3a and 3c are long sides, 3b and 3d are short sides) 3e central part 4 seats 5 Net 6 Storage section 7 Fertilizer bag 8 First fold 9 Lower part 9a Folding bottom 9b Non-folding bottom 10 Upper part 10a Folding center 10b Folded top 10c non-folding top 11 Second fold 12 Folding section 13 anchor pin 14 Sparse area 15 Secret area 51 Folding section 52 Net 52a~52d Four sides (52a and 52c are long sides, 52b and 52d are short sides) 52e central part 53 anchor pin A. Protected Area a seed b. Vegetation substrate N slope P plant R rope S Plant growth space

Claims

1. A feeding damage prevention net having a folding portion and laid in a loose state, This net for preventing pest damage is laid so that the folds formed on the underside of the folding part remain in the position where they are moved in the direction of unfolding.

2. A method for installing a feeding damage prevention net having a folding portion in a loose state, This is a method for installing a feeding damage prevention net, in which the net is laid so that the fold formed on the underside of the folding part remains in the position where it is moved in the direction of unfolding.

3. 10. A greening tool comprising a sheet-like or mat-like vegetation and the feeding damage prevention net according to claim 1 integrated in a loose state, the greening tool being capable of being wound up in a roll.

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