Weed-proof greening sheet

Abstract

To provide a weeding and greening sheet that exhibits an excellent weeding effect while allowing for the fast growth of a target species, and also reducing the labor of maintenance after its installation, the sheet demonstrating high durability.SOLUTION: A weeding and greening sheet S according to the present invention comprises a multilayer weeding sheet 1 provided with a linear substrate bag 2. In the multilayer weeding sheet 1, the top side of the substrate bag 2 is provided with a sparse part 8, at least the top face of which shows a white color. In the multilayer weeding sheet 1, the top side of the substrate bag 2 is provided with a dense part 7 as well as the sparse part 8.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a weed-control and greening sheet that can simultaneously prevent weeds and promote greening, for example, on slopes and the like. [Background technology]

[0002] One conventional technique for simultaneously preventing weeds and promoting greenery involves laying agricultural mulch film on the ground, drilling holes in desired locations, and planting seeds or seedlings in the holes. This method utilizes the weed-suppressing effect of the mulch film to prevent weeds, while also allowing the growth of desired plants in the holes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-94000 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above method requires drilling holes in the mulch film on-site, which poses a risk to workers on slopes and other surfaces. Furthermore, because the mulch film is lightweight, it can easily be blown away by the wind before it can be secured in place.

[0005] Therefore, as a technology that can solve the above problems, a greening method using a seeded weed control sheet that integrates multiple components such as two sheets of nonwoven fabric, a poly sheet, a Russell net sheet, and a water-soluble seed sheet (for example, Patent Document 1) has been proposed, but the structure of the seeded weed control sheet is complex and tends to be expensive.

[0006] In addition, the applicant himself proposed in Patent Application No. 2021-121216 a weed-prevention greening sheet that prevents the growth of competing species while enabling the early growth of target species and reducing subsequent maintenance.The present invention aims to provide a weed-prevention greening product that can further improve weed prevention effect and durability.

[0007] The present invention has been made with the above-mentioned matters in mind, and its object is to provide a highly durable weed-control greening sheet that exhibits excellent weed-control effects while enabling the early growth of target species and reducing subsequent maintenance. [Means for solving the problem]

[0008] In order to achieve the above object, the weed control and greening sheet of the present invention is a multi-layer weed control sheet provided with a striped base material bag. In the multi-layer weed control sheet, at least the upper surface of the sparse portion arranged on the upper side of the base material bag is whitish, and at least the upper surface of the weed control portion located away from the upper side of the base material bag is dark. (Claim 1).

[0009] The above weed control greening sheet is The base material bag has a sparse portion and a dense portion disposed on the upper side thereof, the longitudinal direction of which is set along the contour line of the slope, and the sparse portion is located closer to the toe of the slope than the dense portion. This may be done (Claim 2).

[0010] The above weed-control greening sheet The multi-layer weed control sheet has pockets for accommodating substrate bags and weed control sections arranged alternately from one end to the other, and the multi-layer weed control sheet is a double weed control sheet made up of two layers, a front tissue and a back tissue, the front tissue being located on the upper side of the weed control section and on the lower side of the pocket section, and the back tissue being located on the lower side of the weed control section and on the upper side of the pocket section, the entire area of the front tissue constituting the pocket section being a sparse section with a lower density of constituent materials and a larger mesh than the area constituting the weed control section, and the area of the back tissue constituting the pocket section being divided into a sparse section with a lower density of constituent materials and a larger mesh than the area constituting the weed control section and a dense section with a higher density and a smaller mesh, and the constituent material of the front tissue is a dark-colored material and the constituent material of the back tissue is a white-colored material. This is also possible (claim 3). [Effects of the Invention]

[0011] The present invention provides a highly durable weed-controlling greening sheet that exhibits excellent weed-control effects while enabling the early growth of target species and reducing subsequent maintenance.

[0012] That is, when the weed control greening sheet of the present invention (the invention according to each claim of this application) is laid on a slope or the like, the multi-layer weed control sheet can suppress the germination and growth of competing species, and by storing seeds and fertilizer of the target species in a substrate bag, for example, and ensuring that the substrate bag is strong enough not to hinder the target species from germinating or rooting, the germination and growth of the target species can be promoted. Even after the target species has been rapidly grown in this way, the multi-layer weed control sheet's effect of suppressing the growth of competing species continues, thereby reducing maintenance and management. Furthermore, the weed control greening sheet of the present invention can be constructed only from a multi-layer weed control sheet and a substrate bag, and cost reductions can be expected due to the simplified construction.

[0013] In addition, with the weed-control greening sheet of the present invention, even if defective weed control areas (such as tears or widening of mesh size) occur in some of the multiple layers constituting the multi-layer weed-control sheet due to falling stones or deterioration over time, the weed-control effect will be maintained as long as defective weed control areas do not occur in the remaining layers. In other words, the weed-control function (such as the function of inhibiting the germination of buried seeds in the soil) is likely to be exerted over a long period of time. Of course, it is also easy to increase the weed-control effect by increasing the basis weight of some or all of the multiple layers. Moreover, if the multiple layers include two layers that are stacked one above the other without being completely fixed in contact with each other over the entire surface, an air space will exist between the two layers. This air space improves the heat retention of the weed-control greening sheet, which also has the effect of making buried seeds present on slopes, etc. where the weed-control greening sheet is laid, more likely to wither and die due to heat. Furthermore, even if airborne seeds do take root on the weed control greening fabric and those roots pass through the upper layer of the multi-layer weed control fabric, there is still no ground there and at least the lower layer of the multi-layer weed control fabric is present, so those airborne seeds are also likely to wither and die.

[0014] Furthermore, with the weed-control greening sheet of the present invention, even if the upper layers of the multiple layers making up the multi-layer weed-control sheet are damaged or develop gaps due to UV degradation, full-scale UV degradation of the lower layers etc. will begin from that point onwards, thereby significantly improving durability against UV degradation.

[0015] Furthermore, in the weed-control greening sheet of the present invention, if the multi-layer weed-control sheet and the base bag are each water-permeable, moisture will be supplied to the seeds of the target species inside the base bag by rainfall, etc. In particular, if the multi-layer weed-control sheet contains the air layer described above, moisture will be more likely to be retained in that air layer, which will in turn create an environment in which moisture is continuously supplied to the seeds of the target species, improving the growth and rooting of the target species.

[0016] Furthermore, with the weed-control greening sheet of the present invention, by changing the density of each layer of the multi-layer weed-control sheet, it is easy to freely control the degree of rainwater penetration and the degree of inhibition of germination of buried seeds in accordance with the local geology, surrounding vegetation environment, weather environment, etc.

[0017] The present invention In this weed-control greening sheet, the low weed-control function of the sparse sections can be utilized to promote the germination and growth of the seeds of the target species contained within the substrate bag. Furthermore, the sparse sections arranged on the entire or partial upper side of the substrate bag make it difficult for heat to build up in the space below these sparse sections and in the substrate bag located within this space, and by coloring at least the upper surface of the sparse sections arranged on the upper side of the substrate bag white, the temperature rise of the substrate bag located below the sparse sections is suppressed, making it difficult for the target species within the substrate bag to wither and die due to high temperatures, thereby improving the survival of the target species.

[0018] Claim Section 2 In the weed-control greening sheet of the present invention, the low weed-control function of the sparse areas can be utilized to promote the germination and growth of the seeds of the target species contained within the substrate bag, and by arranging not only sparse areas but also dense areas on the upper side of the substrate bag, the dense areas can firmly hold the substrate bag in place, thereby increasing the certainty of vegetation establishing in the substrate areas even in cases where the weed-control greening sheet is exposed to harsh natural environments after installation.

[0019] Furthermore, when the substrate bag is housed and held between the layers of a multi-layer weed control sheet, it is more likely that the dense portion in the upper layer of the substrate bag will adhere to the substrate bag, and as a result, the sparse portion will also adhere to the substrate bag. If the sparse portion does not adhere to the substrate bag and a gap is created between the substrate bag and the sparse portion above it, the sprouts of the target species that grow in the gap may be obstructed by the material that makes up the sparse portion, impairing germination. However, as described above, the claim that the sparse portion is likely to adhere to the substrate bag Section 2 In the weed-control greening sheet of the present invention, the target seeds that germinate from the substrate bag can easily grow through the sparse portions, thereby improving germination ability. [Brief explanation of the drawings]

[0020] [Figure 1] 1A and 1B are perspective views of a weed-control and greening sheet according to an embodiment of the present invention as seen from above and below, respectively. [Figure 2] FIG. 2(A) is a longitudinal cross-sectional view of the weed-control greening sheet laid on a slope, and FIG. 2(B) is a longitudinal cross-sectional view of a double weed-control sheet that constitutes the weed-control greening sheet. [Figure 3] (A) is an explanatory diagram showing only the warp threads of both the front and back structures in the main part of the double weed control sheet, (B) is an explanatory diagram showing only the warp threads of the front structure extracted from (A), (C) is an explanatory diagram showing only the warp threads of the back structure extracted from (A), (D) is an explanatory diagram of the structure of the front structure showing the warp threads of the front structure shown in (B) together with the weft threads etc. that are entangled with them, and (E) is an explanatory diagram of the structure of the back structure showing the warp threads of the back structure shown in (C) together with the weft threads etc. that are entangled with them. DETAILED DESCRIPTION OF THE INVENTION

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

[0022] The weed control and greening sheet S shown in Figures 1(A) and (B) comprises a double weed control sheet (an example of a multi-layer weed control sheet) 1 with multiple strip-shaped (long) base material bags 2 that can be attached and detached. It is used by unfolding it on the target construction site, such as a slope N (see Figure 2(A)) or flat land where weed control and greening are to be achieved simultaneously, and fixing (laying) it down with appropriate fixing devices (anchor pins, etc., not shown).

[0023] 1(A) and 1(B), the double weed control sheet 1 is rectangular in plan view and has a total of three pockets 3 spaced apart in the X direction, which is its vertical (longitudinal) direction, and each pocket 3 extends in the Y direction, which is the horizontal (short) direction of the double weed control sheet 1, and a substrate bag 2 can be inserted and removed from each pocket 3 that extends from one end to the other in the Y direction of the double weed control sheet 1. Furthermore, in the double weed control sheet 1, the areas sandwiching each pocket 3 in the X direction are each configured as weed control sections 4, meaning that the weed control sections 4 and pocket sections 3 are lined up alternately from one end to the other in the X direction.

[0024] As shown in Figure 2(B), the double weed control sheet 1 is made of a woven fabric having a two-layer sheet structure consisting of a front weed control section 5 and a back weed control section 6. The front weed control section 5 is located on the upper side in the weed control section 4 and on the lower side in the pocket section 3, while the back weed control section 6 is located on the lower side in the weed control section 4 and on the upper side in the pocket section 3.

[0025] More specifically, as shown in Figure 3(A), when attention is focused only on warp threads 5A (threads extending in the X direction shown in Figures 1(A) and 1(B)) that make up the face structure 5 and warp threads 6A (threads extending in the X direction shown in Figures 1(A) and 1(B)) that make up the back structure 6, the two cross each other so that in the weed-controlling section 4, the warp threads 5A are located on the upper side and the warp threads 6A are located on the lower side, and in the pocket section 3, the warp threads 5A are located on the lower side and the warp threads 6A are located on the upper side.

[0026] In reality, the warp threads 5A of the face structure 5 shown in Figure 3(A) are woven so that the weft threads 5B are intertwined with them as shown in Figure 3(E). Comparing Figures 3(A), (C), and (E) makes it easy to understand that the weft threads 5B intertwined with the warp threads 5A of the face structure 5 are woven so that they are dense in the weed control section 4 and sparse in the pocket section 3 (plain weave).

[0027] On the other hand, the warp threads 6A of the back structure 6 shown in Figure 3(A) are actually woven so that the weft threads 6B are entangled with them as shown in Figure 3(D). As can be easily understood by comparing Figures 3(A), (B) and (D), the weft threads 6B entangled with the warp threads 6A of the back structure 6 are woven so that they are dense in the entire weed control section 4 and in part of the pocket section 3, and sparse in other parts of the pocket section 3 (plain weave).

[0028] Specifically, as shown in Figure 3(D), the area constituting the pocket portion 3 of the backing fabric 6 includes a dense portion 7 located near one end in the X direction (see Figures 1(A) and (B)) and a sparse portion 8 located near the other end, and the dense portion 7 is narrower in area than the sparse portion 8, occupying, for example, 80% or less (preferably half or less) of the area of the sparse portion 8.

[0029] In this example, in the back structure 6, the weft threads 6B in the area constituting the weed-proof section 4 are the same as the weft threads 6B in the area constituting the dense section 7, and the density (pitch in the X direction) of the weft threads 6B in both areas is also the same or approximately the same.

[0030] On the other hand, in the sparse portion 8, a weft thread 6C which is thinner than the weft thread 6B is used in place of the weft thread 6B and is plain woven, and the pitch of this weft thread 6C in the X direction is larger than the pitch of the weft thread 6B in the dense portion 7 in the X direction. In other words, the density of the weft thread 6C in the area constituting the sparse portion 8 is smaller than the density of the weft thread 6B in the area constituting the dense portion 7.

[0031] That is, in the back structure 6, the area constituting the pocket portion 3 is divided into a sparse portion 8 where the density of the constituent materials (warp and weft threads) is lower and the mesh size is larger (i.e., lower weed control function) than the area constituting the weed control portion 4, and a dense portion 7 where the density is higher and the mesh size is smaller (i.e., higher weed control function), whereas in the front structure 5, the entire area constituting the pocket portion 3 is a sparse portion 9 where the density of the constituent materials (warp and weft threads) is lower and the mesh size is larger (i.e., lower weed control function) than the area constituting the weed control portion 4.

[0032] When such a weed-control greening sheet S is laid on a slope N as shown in FIG. 2(A), the double weed-control sheet 1 can mainly suppress the germination and growth of competing species by means of the weed-control portion 4.

[0033] Furthermore, sparse areas 8, 9 with low weed control function are provided in the holding position (pocket area 3) of the substrate bag 2 in the double weed control sheet 1, and the sparse areas 8, 9 have one or more of the following structure or properties: lower density of constituent materials, lower strength, thinner, or more susceptible to deformation by external forces than the areas surrounding the sparse areas 8, 9 in the double weed control sheet 1 (weed control areas 4, dense areas 7), so it is sufficient if they are at least less likely to hinder the germination and growth of the target species. In a weed control greening sheet S configured in this way, the substrate bag 2 housed in the pocket area 3 seals the sparse areas 8, 9, so the substrate bag 2 can compensate for the low weed control function of the sparse areas 8, 9. Furthermore, for example, by storing seeds of the target species, fertilizer, etc. in the substrate bag 2 and making the substrate bag 2 strong enough so as not to hinder the germination or root growth of the target species (the sprouts and roots of the target species can easily break through), it is possible to take advantage of the low weed-prevention function of the sparse portions 8, 9 to promote the germination and growth of the seeds of the target species stored in the substrate bag 2.

[0034] Furthermore, even after the growth of the target species has been achieved at an early stage in this way, the double weed control sheet 1 continues to have an effect of suppressing the growth of competing species, which makes it possible to reduce the amount of maintenance required.

[0035] Furthermore, in the weed control greening sheet S of this example, the substrate bag 2 can be inserted into the pocket portion 3 and held in place by the double weed control sheet 1, making it easy to hold the substrate bag 2. In addition, no components other than the double weed control sheet 1 are required to hold the substrate bag 2, preventing costs from increasing due to an increase in the number of components.In other words, the weed control greening sheet S can be made up of only the double weed control sheet 1 and the substrate bag 2, and costs can be reduced by simplifying the configuration.

[0036] Furthermore, in the weed control greening sheet S of this example, the base material bag 2 is held by the double weed control sheet 1 so that it is exposed at least on its underside. In this example, a sparse portion 9 is provided on the underside (surface structure 5) of the pocket portion 3, and the portions of the underside of the base material bag 2 inserted into the pocket portion 3 where the warp threads 5A and weft threads 5B that make up the sparse portion 9 do not come into contact are exposed on the underside. In the weed control greening sheet S configured in this way, the base material bag 2, which is provided so that it is exposed on the underside of the double weed control sheet 1, can be brought into contact with the natural ground, etc., ensuring the germination and growth of the seeds of the target species contained in the base material bag 2.

[0037] In addition, with the weed control greening sheet S of this example, even if a weed-control defect (such as a tear or widening of the mesh size) occurs in one of the two layers (front fabric 5, back fabric 6) that make up the double weed control sheet 1 due to a boulder falling or deterioration over time, the weed control effect will be maintained as long as no weed-control defect occurs in the other layer. In other words, the weed control function (such as the function of inhibiting the germination of buried seeds in the soil) is likely to be exerted over the long term. Of course, it is also easy to increase the weed control effect by increasing the basis weight of one or both of the two layers. Moreover, unless the two layers are completely and completely fixed together, an air gap will exist between them. This air gap improves the heat retention of the weed control greening sheet S, which has the effect of making buried seeds present on slopes N, etc., where the weed control greening sheet S is laid, more likely to wither and die due to heat. Furthermore, even if the flying seeds take root on the weed control greening sheet S and the roots pass through the upper layer of the double weed control sheet 1 (surface tissue 5 in the weed control section 4, back tissue 6 in the pocket section 3), there is still no ground there and there is at least the lower layer of the double weed control sheet (back tissue 6 in the weed control section 4, base material bag 2 and surface tissue 5 in the pocket section 3), so the flying seeds are also likely to wither and die.

[0038] Furthermore, in the weed-control greening sheet S of this example, even if the upper layer (surface tissue 5 in the weed-control section 4, back tissue 6 in the pocket section 3) of the two layers (surface tissue 5, back tissue 6) that make up the double weed-control sheet 1 is damaged or has gaps due to UV degradation, full-scale UV degradation of the lower layers (back tissue 6 in the weed-control section 4, base material bag 2 and surface tissue 5 in the pocket section 3) will begin from that point, and therefore resistance to UV degradation can be greatly improved.

[0039] Furthermore, in the weed control greening sheet S of this example, if the double weed control sheet 1 and base material bag 2 are both water permeable (for example, the double weed control sheet 1 is woven and therefore allows a small amount of moisture to penetrate), rainfall or other factors will supply moisture to the seeds of the target species in the base material bag 2, and moisture will be particularly likely to be retained between the upper and lower two layers (front tissue 5, back tissue 6) of the double weed control sheet 1, which will in turn create an environment in which moisture is continuously supplied to the seeds of the target species, improving the growth and rooting of the target species. For example, as shown in Figure 2(A), if the weed control greening sheet S is laid on a slope N so that the longitudinal direction of the base material bag 2 follows the contour lines of the slope N, the moisture retained between the upper and lower two layers (front tissue 5, back tissue 6) of the double weed control sheet 1 will be easily supplied to the base material bag 2 at the foot of the slope. To increase the durability of this moisture supply effect, a material with water retention properties, such as a high molecular weight polymer, may be sandwiched between the upper and lower layers of the double weed control sheet 1 (surface tissue 5, back tissue 6).

[0040] Furthermore, in the weed control greening sheet S of this example, by changing the density (the folding degree of the warp and weft threads, which are the constituent materials, and the mesh size, etc.) of the two layers (front fabric 5 and back fabric 6) of the double weed control sheet 1, it becomes easy to freely control the degree of rainwater penetration and the degree of suppression of germination of buried seeds in accordance with the local geology, surrounding vegetation environment, weather environment, etc.

[0041] Furthermore, in the weed-control greening sheet S of this example, by arranging not only sparse portions 8 but also dense portions 7 on the upper side of the substrate bag 2, the substrate bag 2 can be firmly held in place by these dense portions 7, thereby increasing the reliability of vegetation being established on the substrate portion 2 even in cases where the weed-control greening sheet S after installation is exposed to harsh natural environments.

[0042] In addition, in this example of the weed-proof greening sheet S, the pocket portion 3 is made up of two layers (top and bottom layers 5 and 6), and the base material bag 2 is sandwiched between these two layers and firmly held in place, making it easy to increase the adhesion of the base material bag 2 to the pocket portion 3.

[0043] Furthermore, when the substrate bag 2 is contained and held (sandwiched) between the upper and lower two layers (front tissue 5, back tissue 6) of the double-layered weed control sheet 1, it is more likely that the dense portions 7 in the upper layer (back tissue 6) of the substrate bag 2 will adhere closely to the substrate bag 2, and therefore the sparse portions 8 will also adhere closely to the substrate bag 2. If the sparse portions 8 do not adhere closely to the substrate bag 2, leaving a gap between the substrate bag 2 and the sparse portions 8 above it, sprouts of the target seeds growing in the gap may be obstructed by the material (warp threads 6A, weft threads 6C) that makes up the sparse portions 8, impairing germination ability. However, in the weed control greening sheet S of this example, in which the sparse portions 8 easily adhere to the substrate bag 2 as described above, the target seeds that germinate from the substrate bag 2 will easily grow through the sparse portions 8, thereby improving germination ability.

[0044] Furthermore, in the case of the weed-control greening sheet S of this example, for example, if the longitudinal direction of the substrate bag 2 is aligned with the contour lines of the slope N (see Figure 2(A)), and the weed-control greening sheet S is positioned so that the dense portion 7 of the pocket portion 3 is on the slope toe side (this can be easily understood by looking at the weed-control greening sheet S in Figure 1(A) as if the upper right faces the slope toe side and the lower left faces the slope toe side, and the pocket portion 3 in the figure extends along the contour lines), then the dense portion 7 will function as a roof, so to speak, that prevents airborne seeds and fine soil particles from entering the pocket portion 3, and by inhibiting the growth and establishment of airborne weeds and the like, the growth and establishment of the target species (introduced species) contained in the substrate bag 2 can be improved.

[0045] The specific configuration of the weed-control and greening sheet S will be described below.

[0046] The material of the double weed control sheet 1 (front and back structures 5 and 6) may be the same as polyethylene used in so-called blue tarps.

[0047] The warp threads 5A, 6A and weft threads 5B, 6B that make up the double weed control sheet 1 may be flat yarns with a width of, for example, about 3 mm, and the weft thread 6C may be a monofilament with a thickness of about 440 decitex (400 denier).

[0048] When a base material bag 2 with a diameter of 30 mm is attached to the pocket portion 3, the width of the stripe (width in the X direction) where there is no weft thread 5B in the sparse portion 9 may be approximately 40 to 50 mm, and the spacing between the weft threads 6C in the sparse portion 8 may be, for example, approximately 10 mm in the X direction.

[0049] In the double weed control sheet 1, at least the upper surface of the sparse portion 8 arranged on the upper side of at least a portion (preferably more than half) of the substrate bag 2 is whitish. In other words, the sparse portion 8 arranged on the upper side of at least a portion of the substrate bag 2 makes it difficult for heat to build up in the space below this sparse portion 8 (the space inside the pocket portion 3) and in the substrate bag 2 located within this space, and by making at least the upper surface of the sparse portion 8 arranged on the upper side of the substrate bag 2 whitish, a rise in temperature in the substrate bag 2 located below the sparse portion 8 is suppressed, making it difficult for the target species in the substrate bag 2 to wither and die due to high temperatures, and improving the survival of the target species.

[0050] Furthermore, if the entire top surface of the weed control section 4 is a dark color such as black, the weed control section 4 will have excellent light-blocking properties, which is advantageous for suppressing the growth of buried species (weeds) when the double weed control sheet 1 (weed control greening sheet S) is laid on the ground, etc., and the weed control section 4 will also be less susceptible to ultraviolet degradation and have excellent weather resistance. In particular, if the entire top surface of the weed control section 4 is black, which has good infrared absorption properties, the weed control section 4 will be more likely to heat up when sunlight is incident on it, and this heat will more easily wither and kill buried species (weeds).

[0051] In this example, the constituent materials of the front structure 5 (warp threads 5A, weft threads 5B) are dark colors such as black, and the constituent materials of the back structure 5 (warp threads 6A, weft threads 6B, 6C) are white. As a result, as shown in Figure 1 (A), the upper surface of the weed-control section 4 is dark, and the upper surface of the pocket section 3 is white. Accordingly, the dense section 7 that functions as the roof section described above is also white, and if the dense section 7 as the roof section were to become hot, the space below it and the substrate bag 2 located within this space would also become hot; however, by making the dense section 7 white, it is less likely to become hot, and ultimately it is possible to prevent the seeds of the target species in the substrate bag 2 from becoming hot.

[0052] However, since white threads are generally more susceptible to UV degradation than dark threads and tend to be weaker in strength and durability, the thin weft thread 6C may be made dark in color to prioritize strength and durability. If the backing fabric 6 constituting the upper layer of the pocket portion 3 is white and is expected to lose its holding power for the base bag 2 due to UV degradation, it is necessary to attach the target species while this holding power is maintained.

[0053] The substrate bag 2 contains the target species of vegetative substrate (for example, seeds, bulbs, runners, etc.), as well as materials (substrates) suitable for the growth of the vegetative substrate, such as fertilizer, soil conditioner, and water-retaining material.

[0054] When laying the weed control greening sheet S configured as above at the construction site, if the base material bags 2 are attached in advance to each pocket portion 3 of the double weed control sheet 1, the labor required for this attachment work on site will be reduced, and this reduction in work is advantageous in reducing danger, particularly when the site is on a steep slope. Furthermore, although the double weed control sheet 1 is lightweight on its own, attaching even one heavy base material bag 2 to the double weed control sheet 1 has the effect of making it less likely for the double weed control sheet 1 to be blown away by the wind when it is laid down.

[0055] However, this is not limiting, and instead of attaching a substrate bag 2 to each of the pocket portions 3 of the double weed control sheet 1 in advance, substrate bags 2 may be attached to only some of the pocket portions 3, or the double weed control sheet may be transported to the site without any substrate bags 2 attached, and then substrate bags 2 may be attached to the unattached pocket portions 3 at the site. From the perspective of making the double weed control sheet 1 less likely to be blown away by the wind, it is preferable to attach at least one substrate bag 2 to the double weed control sheet 1 in advance.

[0056] When the weed-control greening sheet S constructed as described above is laid on a slope N, rainwater is supplied to the ground from the sparse portion 8 through the inside or outside of the substrate bag 2 underneath, thereby overcoming the weakness of the double weed-control sheet 1 that the back side of the double weed-control sheet 1 dries out, weakening the slope N (loosening the ground), and there is no need to perform work such as drilling holes to overcome this weakness.

[0057] Furthermore, when the weed control greening sheet S is laid on a slope N, the double weed control sheet 1 has a weakness in that the flow rate of rainwater flowing over the sheet tends to increase. This weakness can be overcome by the sparse section 8, which has the function of draining and dispersing rainwater from the top of the double waterproof sheet 1 to the bottom side (the ground side).

[0058] In addition, the deterioration of the landscape when the weed-proof greening sheet S is laid in the construction area can be reduced by stripe-like greening achieved by the germination and growth of the target species from the substrate bags 2 arranged along the sparse areas 8 and 9 that extend in stripes. Furthermore, the weed-control greening sheet S prevents the overgrowth of competing plants (mainly weeds), reducing the effort and management costs of weeding and preventing injuries caused by weeding. In addition, by appropriately spacing the pocket sections 3 (sparse sections 8, 9) or the base material bags 2 in the X direction and locating each pocket section 3 (sparse sections 8, 9, base material bag 2) at a distance from both ends of the double weed-control sheet 1 in the X direction to achieve strip-like greening, the target plants growing in each base material bag 2 are less likely to have their sunlight blocked or suppressed by surrounding competing plants, and their sunlight is also less likely to be blocked by plants of the target species growing in other base material bags 2 adjacent in the X direction. This makes it easier to create an extremely suitable growth environment for the target plants, which in turn contributes to early greening.

[0059] Furthermore, with weed control sheets that do not incorporate greening, sunlight reflected from the surface of the weed control sheet becomes intense light that can easily enter the eyes of drivers of automobiles, etc., and there is a risk of compromising driving safety. However, the weed control and greening sheet S of this example has striped greening as described above, and not only does this greening not reflect sunlight as intense light, but the natural green is easy on the eyes. Moreover, as shown in Figure 1(A), most of the top surface of the weed control and greening sheet S is made up of dark-colored weed control parts 4, so this weed control part 4 does not reflect sunlight as intense light, and driving safety of automobiles, etc. can also be improved.

[0060] Furthermore, when laying the weed control greening sheet S on a slope, if the longitudinal direction (Y direction) of the sparse portions 8, 9 (substrate bag 2, pocket portion 3) is arranged so that they follow the contour lines, the thick substrate bag 2 will block the soil and sand that has washed away from the mountain side, forming a berm, which could make it easier for flying plants to settle on the berm due to the so-called berm effect. However, if the back tissue 6 that makes up the upper side of the pocket portion 3 and the front tissue 5 that makes up the lower side are designed so that the latter is relatively more likely to float (deform easily) when the substrate bag 2 is placed in the pocket portion 3 than the former, in other words, if the upper side of the pocket portion 3 is made less likely to deform than the lower side, then deformation of the weed control sheet 1 due to the thickness of the substrate bag 2 will be more noticeable on the underside and less noticeable on the upper side. As a result, the above-mentioned berms will be less likely to form, which will more easily hinder the settlement and growth of flying plants and make it easier for target species to grow.

[0061] In addition, as can be seen from Figures 1(A) and 2(A), the dense portion 7, which functions as a roof portion as described above, has a gentle slope and is particularly likely to block runoff sediment, but in this example, the density of the constituent materials (warp and weft threads) is higher and the mesh size is smaller than that of the sparse portion 8. If the constituent material of the dense portion 7 is one that has low friction with runoff sediment (such as the polyethylene used in the so-called blue tarps mentioned above), the runoff sediment will not get caught on the dense portion 7 and will be able to flow down over the dense portion 7, which means that the formation of berms will also be suppressed by the dense portion 7. On the other hand, the sparse portion 8 has a steep slope and is particularly likely to block runoff sediment, and the weft threads 6C extending in the Y direction in this sparse portion 8 are thin, so runoff sediment will not get caught on the sparse portion 8 either, which means that the formation of berms will also be suppressed by the sparse portion 8.

[0062] 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.

[0063] 1(A) and 1(B), three pockets 3 are provided in one double weed control sheet 1, but the number of pockets 3 can be changed as desired. Furthermore, the number of base material bags 2 housed in each pocket 3 is not limited to one, and may be two or more.

[0064] In the examples of Figures 3(D) and (E), sparse portions 8, 9 are formed in parts of the double weed control sheet 1 by using warp threads 6C that are thinner than in other areas, or by increasing the pitch of the weft threads 6C, 5B that are provided. However, this is not limitative, and sparse portions 8, 9 may also be formed by other methods, such as by making cuts in parts of the double weed control sheet 1.

[0065] In the above embodiment, the base material bag 2 can be inserted into and removed from the pocket portion 3 from either one end side or the other end side, but this is not limiting, and for example, the base material bag 2 may be inserted into and removed from only one end side or the other end side of the pocket portion 3. In any case, at least one of both ends of the pocket portion 3 in the Y direction needs to be open.

[0066] In contrast, both ends in the Y direction of the weed controlling section 4 may be closed or open. For example, from the perspective of reliably preventing a substrate bag 2 that should be inserted into a pocket section 3 from being mistakenly inserted into the weed controlling section 4, it is preferable to close both ends in the Y direction of the weed controlling section 4, but from the perspective of being able to insert, for example, a material with a water-retaining function between the two upper and lower layers (front tissue 5, back tissue 6) that make up the weed controlling section 4, it is preferable to leave at least one of the ends in the Y direction of the weed controlling section 4 open. Methods of closing the Y direction ends of the pocket section 3 and weed controlling section 4 include gluing, sewing, bundling, etc. using appropriate materials and tools.

[0067] The dense portion 7 only needs to have a higher weed-preventing function than the sparse portion 8, and may have a higher or lower weed-preventing function than the area constituting the weed-preventing portion 4 in the back tissue 6. Alternatively, the dense portion 7 may not be provided, and the area constituting the pocket portion 3 in the back tissue 6 may all be constituted as the sparse portion 8.

[0068] In the above embodiment, the dense portion 7 is provided near one end in the X direction of the region constituting the pocket portion 3 of the back tissue 6, and the sparse portion 8 is provided near the other end. However, this is not limiting, and for example, the dense portion 7 may be provided at both ends in the X direction of the region constituting the pocket portion 3 of the back tissue 6, and the sparse portion 8 may be provided therebetween, or the dense portion 7 and the sparse portion 8 may be provided alternately and repeatedly from one end to the other end in the X direction of the region constituting the pocket portion 3 of the back tissue 6.

[0069] It is also possible to arrange weft thread 6B instead of weft thread 6C in sparse portion 8, and to arrange a thinner weft thread instead of weft thread 5B in sparse portion 9, or to have no weft threads in sparse portions 8, 9. However, if no weft threads are arranged in sparse portions 8, 9, warp threads 5A, 6A that are not entangled with the weft threads tend to flutter, and this ease of movement may get in the way when inserting base material bag 2 into pocket portion 3. Therefore, it is preferable to provide weft threads in order to suppress the movement of warp threads 5A, 6A and make it easier to insert base material bag 2 into pocket portion 3.

[0070] In the above embodiment, the front tissue 5 and back tissue 6 are woven so that they are switched up and down between the pocket section 3 and the weed control section 4, but this is not limiting, and for example, two sheets may be stacked one on top of the other and joined together at appropriate locations by sewing, gluing, etc. to form the pocket section 3 (including the dense section 7 and the sparse sections 8, 9) and the weed control section 4, which can be used as the double weed control sheet 1. In this case, it is possible to color the top surface of the pocket section 3 white and the top surface of the weed control section 4 dark by applying or spraying an appropriate paint, etc.

[0071] In the above embodiment, a double weed control sheet 1 made of a woven fabric having a two-layer sheet structure in which a front weed structure 5 and a back weed structure 6 are laminated is used as an example of a multi-layer weed control sheet. However, the present invention is not limited to this. For example, a multi-layer weed control sheet made of a woven fabric having a multi-layer sheet structure in which three or more weed structures are laminated, or a multi-layer weed control sheet in which three or more sheets are stacked one on top of the other and appropriately joined together, may also be used. When using such a multi-layer weed control sheet having three or more layers, the number of layers located above the substrate bag 2 when the substrate bag 2 is placed in the pocket portion 3 may be more or less than the number of layers located below the substrate bag 2, or the number of layers may be the same. However, when there are multiple layers located above the substrate bag 2, it is preferable to appropriately adjust the density of the area of each layer corresponding to the sparse portion 8 so that the sparse portion 8 is formed even when the multiple layers are stacked one above the other. Similarly, when there are multiple layers located below the substrate bag 2, it is preferable to appropriately configure each layer so that the sparse portion 9 is formed.

[0072] It goes without saying that the above modifications may be combined as appropriate. [Explanation of symbols]

[0073] 1 Double weed control sheet 2 Base material bag 3 Pocket section 4 Weed control department 5 Table organization 5A warp thread 5B weft 6. Underground Organizations 6A warp thread 6B weft 6C weft 7 Secret area 8 Sparse area 9 Sparse area N slope S Weed Control Greening Sheet

Claims

1. The multi-layer weed control sheet is equipped with a striped base material bag, A weed-control greening sheet characterized in that in the multi-layer weed-control sheet, at least the upper surface of the sparse portion arranged above the base material bag is whitish, and at least the upper surface of the weed-control portion located away from the upper side of the base material bag is dark-colored.

2. The multi-layer weed control sheet has sparse and dense sections arranged on the upper side of the substrate bag, which is installed so that its longitudinal direction follows the contour lines of the slope, and the sparse sections are located closer to the foot of the slope than the dense sections.

3. The multi-layer weed control sheet has pocket portions for accommodating substrate bags and weed control portions arranged alternately from one end side to the other end side, The multi-layer weed control sheet is a double layer weed control sheet consisting of two layers, a front layer and a back layer, The surface tissue is located on the upper side in the weed-preventing area and on the lower side in the pocket area. The backing is located on the bottom in the weed-control area and on the top in the pocket area. In the surface structure, the entire area that makes up the pocket part is a sparse area with a lower density and larger mesh size than the area that makes up the weed-control part. In the backing structure, the area constituting the pocket part is divided into a sparse part having a lower density of constituent material and a larger mesh size than the area constituting the weed-control part, and a dense part having a higher density and a smaller mesh size than the sparse part.

3. The weed-control and greening sheet according to claim 1, wherein the surface structure is made of a dark-colored material and the back structure is made of a white-colored material.

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