JP5309839B2 - Weed prevention structure for weed prevention and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weed-control structure and a construction method of the weed-control structure, preventing the growth of weeds over the whole area in need of weed-control and surely maintaining the end fixation of a weed-control sheet over a long period of time while keeping fine appearance in the case of laying the weed-control sheet particularly on a face of slope. <P>SOLUTION: The construction method of the weed-control structure for installing the weed-control structure including the weed-control sheet, in the weed-control area, includes steps of: arranging a weed-control sheet body in the weed-control area; fixing at least part of the end of the weed-control sheet body; and covering the at least part of the fixed end with a spraying material by spraying the spraying material. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a herbicidal structure for preventing grass that is installed in a place where it is necessary to prevent the growth of grass, and a construction method thereof.

  On roads, railways, rivers, parks and afforestation gardens, and the surrounding ground, surfaces, and slopes in particular, it is often necessary to prevent the growth of grass such as weeds due to the loss of aesthetics. In particular, on the shoulders of roads and the slopes adjacent to them, weeds may not only impair the aesthetics, but also impair traffic safety. Therefore, it is necessary to prevent grass growth in those places.

  In order to prevent grass growth, for example, a herbicidal sheet as disclosed in Patent Document 1 is used.

  As a structure for preventing grass growth, for example, in Patent Document 2, a concrete block portion laid on a road shoulder at the upper end of a slope portion and one end portion on the slope side of the concrete block portion are integrally formed. There is disclosed a road shoulder block that includes a fixed grass prevention sheet portion and that can be covered with a slope portion by spreading the grass prevention sheet portion on the slope surface portion in a state where the concrete block portion is laid on the road shoulder portion.

  Patent Document 3 is characterized in that a light-shielding and water-impervious synthetic resin embossed sheet (weedproof sheet) in which a large number of convex portions are alternately formed on both sides of the sheet is laid and fixed on the ground to be weeded. And a herbicidal structure. Patent Document 3 discloses that when there is a guard rail on the road shoulder, a caulking material is packed in a gap between the guard rail column and the insertion hole of the guard rail column formed in the embossed sheet (weedproof sheet). .

Further, in Patent Document 4, a greening base material used in a greening method such as a slope that sprays a greening base material on a slope or the like to form a soil layer, the greening base material has a particle size of 2 mm or less, A greening base material characterized in that a portion having a diameter of 0.75 mm or less is a mixture of 20-40% Kanuma soil and / or Akadama soil, or both, fiber material, fertilizer, seed, erosion inhibitor and aggregate agent. It is disclosed.
JP 2002-272348 A JP 2005-307518 A JP 2006-177122 A JP-A-8-105049

  When installing a herbicidal structure to prevent grass growth, it is common to use a herbicidal sheet. When laying a weedproof sheet on a slope or the like, it is necessary to securely fix the end of the weedproof sheet. However, the conventional connection method has a problem that the end of the weedproof sheet cannot be reliably fixed over a long period of time while maintaining the aesthetic appearance, and the end of the weedproof sheet is rolled up. .

  Therefore, the present invention prevents the growth of grass over the entire area where grass protection is required, and in particular, even when the grass protection sheet is laid on a slope, the grass protection sheet is reliably maintained over a long period of time while maintaining the aesthetic appearance. An object of the present invention is to obtain a weedproof structure that can keep the end portion fixed and its construction method.

  The present invention relates to a method for constructing a grass protection structure for installing a grass protection structure including a grass protection sheet in a grass protection area, the step of arranging a grass protection sheet body in the grass protection area, A method for constructing a weedproof structure, comprising a step of fixing at least a part of an end portion of a sheet body and a step of covering at least a part of the fixed end portion with a spraying material by spraying the spraying material. It is.

The preferable aspect of the construction method of the weed prevention structure of this invention is shown below. In the present invention, these embodiments can be appropriately combined.
(1) The spray material is at least one selected from a greening base material, concrete, soil, or sand.
(2) The spraying material is a greening base material containing soil, fertilizer and seeds.
(3) The step of fixing at least a part of the end portion of the weedproof sheet main body includes disposing the rod-shaped fixture on the upper surface of at least a portion of the end, and using the rod-shaped fixture mounting device, And the step of covering with a spraying material includes covering the end portion on which the rod-shaped fixture is disposed with the spraying material.
(4) The grass protection area is a grass protection area adjacent to the existing structure.
(5) The grass protection area includes a slope.
(6) The slope is any slope selected from a road slope, a promenade slope and a railway slope.
(7) The weedproof sheet is a penetration-resistant weedproof sheet.

  Moreover, this invention is the weed prevention structure installed by said construction method.

  According to the present invention, it is possible to prevent the growth of grass over the entire area where grass protection is required. It is possible to obtain a weedproof structure that can keep the ends fixed and a construction method thereof. Furthermore, when constructing a herbicidal structure using a spraying material containing a greening base material, the roots of the plant contained in the spraying material take root on the slope as time passes, and the surface of the herbicidal sheet By integrating, the effect of fixing the end of the weedproof sheet to the slope can be further enhanced.

  Moreover, by using a penetration-proof type weedproof sheet as the weedproof sheet, it is possible to obtain a weedproof structure having an outstanding herbicidal performance and excellent durability, and a method for its construction.

  The present invention relates to a herbicidal structure installed in an area where grass growth is prevented and a construction method thereof. The construction method of the weedproof structure of the present invention includes a step of disposing the weedproof sheet in the weedproof area, and a step of fixing at least a part, preferably all of the end portion of the weedproof sheet, and further fixing. A step of covering at least a part of the end portion with a spraying material by spraying the spraying material.

  In the herbicidal structure of the present invention, by covering at least a part of the fixed end portion of the herbicidal sheet with a spraying material, not only the grass growth is prevented over the entire area where the herbicidation is necessary, but also the aesthetics. In the state kept, the end of the weedproof sheet can be securely fixed over a long period of time.

  In this specification, prevention of grass growth is referred to as “weed prevention”. The area where weed control is necessary is called “weed control area”. Hereinafter, the weedproof structure of the present invention and the construction method thereof will be described in detail.

<Weedproof structure>
A schematic plan view of an example of the weedproof structure of the present invention is shown in FIGS. 1 and 5, and characteristic cross-sectional views thereof are shown in FIGS. 2 and 6. As shown in these drawings, the weedproof structure of the present invention includes a weedproof sheet 10. The end portion of the weedproof sheet 10 (referred to as “end portion”) is fixed to the weedproof area by a predetermined method, so that the weedproof structure can be installed. In these drawings, the case where the weedproof structure of the present invention is installed on the slope 30 is illustrated. “Slope” means roads, tracks and promenades, slopes made by cutting and embankment, slopes between two ground surfaces with steps, slopes between two ground surfaces, etc. means. In the weedproof structure of the present invention, as shown in FIGS. 5 and 6, most of the slope 30 other than the portion where weed protection is required is sprayed with a predetermined spray material 21, and the weedproof sheet 10. While fixing the edge part of this, the location which sprayed the spraying material 21 can be greened. Therefore, when a greening base material is used as the spray material 21, not only an appropriate herbicidal effect can be obtained, but also a herbicidal structure excellent in aesthetics due to greening can be obtained.

  In this specification, among the end portions of the weedproof sheet 10, an end portion fixed to an existing structure such as a paved road or a U-shaped groove is referred to as a “first end portion” (symbol: 12). Moreover, in this specification, the edge part fixed on soil, such as a slope, among edge parts of the weed prevention sheet 10 is called "2nd edge part" (code | symbol: 13). In addition, the “end portion” is a region near a predetermined end of the weedproof sheet 10 and refers to a region having a dimension necessary for fixing the weedproof sheet 10 by a predetermined method.

  The fixing method of the first end portion 12 will be described with reference to FIGS. 1 and 2 by taking as an example a case where the first end portion 12 is fixed to an existing structure (paved road 22). The part which the 1st end part 12 of the weedproof sheet 10 used for the weedproof structure of this invention and the paved road 22 contact can be fixed by the heat-fusing method or the tape bonding method. By these fixing methods, the existing structure such as the paved road 22 and the grass protection sheet 10 can be fixed securely.

  In the heat fusion method, the end portion of the herbicidal sheet 10 is heated by a burner or the like to melt and solidify the modified asphalt constituting the herbicidal sheet 10, so that the first end 12 is U-shaped. This is a fixing method in which heat sealing is performed on an existing structure such as the groove 25.

  In the tape bonding method, an asphalt tape having adhesiveness on both sides is inserted between the first end portion 12 and an existing structure such as a paved road 22, and the existing structure such as the first end portion 12 and the paved road 22 is used. This is a method of fixing to an object. The tape bonding method can obtain an adhesive strength substantially equivalent to that of the heat fusion method. When the use of fire is restricted, such as when installed near residential areas or when there are many flammable materials such as undergrass near the installation location, the existing structure such as the first end 12 and the paved road 22 For fixing to an object, it is preferable to use a tape bonding method.

  Moreover, the weedproof sheet 10 can be fixed to an existing structure using a needle-like instrument 14 such as a bent nail-like instrument. The first end 12 of the herbicidal sheet 10 can be fixed using only the needle-like instrument 14, but the first end 12 can be fixed by using it together with the heat fusion method or the tape bonding method. It can be performed more reliably without a gap.

  Moreover, when installing the weed prevention structure of this invention in the vicinity of the place which has the U-shaped groove | channel 25 as an existing structure, from the point of securing more reliably with the U-shaped groove | channel 25, the weed prevention sheet | seat 10 is provided. The first end portion 12 and the U-shaped groove 25 are preferably fixed by using a U-shaped groove needle device 28 which is a kind of needle-shaped device. Fixing by the U-shaped grooved needle-like instrument 28 can be performed alone or in combination with fixing by a heat fusion method or a tape bonding method.

  FIG. 7 shows a schematic diagram of a U-shaped groove needle-like instrument 28 that can be used for fixing to the U-shaped groove 25. The U-shaped groove needle-like instrument 28 has a rod-shaped long nail portion 41, a connecting rod portion 42, and a short rod portion 43. One end of the connecting rod portion 42 of the U-shaped groove needle-like instrument 28 is connected to one end of the long nail portion 41 at a substantially right angle. Further, one end of the short bar portion 43 is connected to the other end of the connecting rod portion 42 so as to face at least a part of the long nail portion 41 substantially in parallel. Therefore, as shown in FIG. 7, the U-shaped grooved needle-like instrument 28 has a shape similar to the numeral “7” as a whole.

  Specifically, the first end portion 12 of the weedproof sheet 10 is fixed to the U-shaped groove 25 such that the short bar portion 43 of the U-shaped groove needle-like instrument 28 is positioned inside the U-shaped groove 25. In addition, the long nail portion 41 of the U-shaped groove needle-like instrument 28 penetrates the weed prevention sheet 10 and is driven into the weed prevention area. With this structure, the first end portion 12 of the weedproof sheet 10 and the U-shaped groove 25 can be reliably fixed. In order to more securely fix the weedproof sheet 10 to the U-shaped groove 25, the interval at which the U-shaped grooved needle-like instrument 28 is driven is preferably 0.5 m or less, and 0.2 to 0.4 m. More preferably.

  Also, as shown in FIG. 4, by laying the first end portion 12 of the weedproof sheet 10 so as to be bent inside the U-shaped groove side wall 26, the weedproof sheet 10 has the U-shaped groove side walls 26 and 27. Of these, it is preferable to have a structure that further covers at least a part of the inside of the side wall 26 closer to the grass protection area. With such a structure, the laid herbicidal sheet 10 becomes difficult to peel off due to the frictional force between the first end 12 of the herbicidal sheet 10 and the corner portion of the side wall 26 of the U-shaped groove. To the U-shaped groove 25 can be further ensured.

  In general, the work of cutting grass on which road slopes and railway slopes grow is a work that involves dangers such as an operator being involved in a traffic accident in some cases where traffic is cut off and not implemented. When the above construction method is used, the first end 12 of the weedproof sheet 10 and the U-shaped groove 25 are securely fixed, so that the weedproof sheet 10 is not easily peeled off from the U-shaped groove 25 and the weedproofing treatment is performed. When the grass protection structure of the present invention is installed in a place where the grass prevention area includes the slope 30, the effect of preventing new grass growth later is very high. This is also preferable from the viewpoint of traffic safety because the frequency of cutting grass that grows after the treatment can be extremely reduced. In addition, even when the slope 30 on which the weedproof structure of the present invention is installed is a promenade slope, an excellent effect is achieved in that the maintenance frequency can be greatly reduced.

  In the weedproof structure of the present invention, the second end 13 is fixed in order to prevent the weedproof sheet 10 from curling. The second end portion 13 can be fixed by driving a nail-like instrument 14 such as a pin or a bent nail-like instrument 15 so as to penetrate the weedproof sheet 10. As shown in FIGS. 1 and 2, the second end portion 13 is fixed by placing a rod-like fixture 16 on the second end portion 13 and fixing it in a rod-like manner by a rod-like fixture attachment device such as a bent nail-like device 15. It is preferable to fix the tool 16. This is because the fixing method can more reliably fix the grass protection sheet 10 to the grass protection area such as the slope 30. In order to fix the rod-shaped fixture 16, it is preferable to use a bent nail-shaped device 15 which is a rod-shaped nail-shaped device having a bent portion at one end. When the rod-shaped fixture 16 is fixed by using the bent nail-shaped device 15, specifically, the grass-proof sheet 10 is penetrated so that the bent portion of the bent nail-shaped device 15 is in contact with the rod-shaped fixed device 16. The rod-like fixture can be fixed by driving the bent nail-like instrument 15 into the grass area.

  A rebar can be used as the rod-shaped fixture 16. In a place where a snow melting agent or the like is used for road management in a cold district or the like, it is preferable to use a reinforcing bar that is not affected by chemicals such as a snow melting agent. Specifically, the reinforcing bar used as the rod-shaped fixture 16 is preferably a steel wire having a diameter of about 6 mm subjected to zinc plating or zinc alloy plating including aluminum.

  The bent portion of the bent nail-like instrument 15 for fixing the rod-shaped fixture 16 is preferably an acute bent portion or a U-shaped bent portion. Specifically, an L-shaped pin can be used as the bent nail-like instrument 15. As an example of the dimension of the L-shaped pin, a pin having a diameter of 16 mm and a long side length of 300 to 800 mm can be used.

  The weedproof structure of the present invention is characterized in that the second end 13 of the weedproof sheet 10 is covered with a spray material 21. After fixing the second end portion 13 of the weedproof sheet 10 by driving a nail-like instrument 14 such as a bent nail-like instrument 15 so as to penetrate the weedproof sheet 10, the second end of the weedproof sheet 10 is performed. The top of the portion 13 is covered with the spray material 21. When the weedproof structure of the present invention has such a structure, the aesthetics of the weedproof area can be improved, and the end of the weedproof sheet 10 can be fixed while maintaining the aesthetics of the weedproof area. It can be reliably maintained for a long time.

  Furthermore, in the weedproof structure of the present invention, in order to enhance the effect of preventing the weedproof sheet 10 from being rolled up, the weedproof sheet 10 is fixed using the rod-shaped fixture 16, and the weedproof sheet 10 and the rod-shaped structure are fixed. The fixing tool 16 may be covered with the spray material 21. When the weedproof structure of the present invention has such a structure, the aesthetics of the weedproof area 20 can be improved, and the end of the weedproof sheet 10 is maintained while maintaining the aesthetic appearance of the weedproof area 20. Fixing can be more reliably maintained over a long period of time.

  The spraying material 21 used for the weedproof structure of the present invention can be at least one selected from a greening base material, concrete, soil, or sand. Depending on the case, the spray material 21 which mixed these components can be used. It is preferable that the spraying material 21 is a greening base material from the point which improves the beauty | look of a weedproof structure, and the point which secures fixation of the weedproof sheet 10. FIG. When a greening base material is used as the spraying material 21, after forming a herbicidal structure, the roots of the plant contained in the greening base material are rooted on the slope, and are integrated with the surface layer of the herbicidal sheet 10. The fixing of the sheet 10 to the slope and the prevention of the weeding sheet 10 from being swollen by a storm can be further ensured.

  The greening base material used as the spraying material 21 in the herbicidal structure of the present invention is obtained by spraying a mixture containing a predetermined greening material (referred to herein as a “greening base material mixture”). The greening base material mixture preferably contains seeds, inorganic particles and fertilizer as a greening material. The inorganic particles are preferably pearlite in terms of being suitable for plant growth.

  The greening base material mixture can further contain a soil, a fiber material, an erosion inhibitor, a flocculating agent, and the like, if necessary. It is preferable that the soil contained in the greening base material mixture is not mixed with weed seeds or root systems. The soil is preferably Kanuma soil and / or Akadama soil having a particle size of 2 mm or less and a portion having a particle size of 0.75 mm or less of 20 to 40%. A well-known thing can be used for the fiber material, fertilizer, seed, erosion inhibitor, and aggregate agent which are contained in a greening base material mixture.

  The spraying material 21 is constructed by charging a predetermined component of the greening base material mixture into a stirrer, stirring and pumping it with a pump, pumping the aggregate into the aggregate tank, and pumping the nozzle of the sprayer And mixing and spraying on the slope or the like.

  1 (planar schematic diagram) and FIG. 2 (cross-sectional schematic diagram) show a specific example in which the second end portion 13 of the weedproof sheet 10 is fixed to the slope 30 using the spray material 21. The width of the spraying material 21 can be appropriately selected depending on the place of construction, is about 0.3 to 10 m wide, more preferably 0.5 to 5 m, especially 1 to 3 m wide. Is preferred. Moreover, in order to heighten the effect which fixes the 2nd edge part 13 of the weed prevention sheet 10 to the slope 30, the thickness of the spraying material 21 is thickness of 50-300 mm, More preferably, it is thickness of 100-200 mm. Preferably, a layer of spray material is formed. The spray material 21 is sprayed on the structure shown in FIG. 3 so as to straddle the second end 13 of the weedproof sheet 10 and a part of the ground (slope 30) outside the second end 13. Thus, the weedproof structure of the present invention shown in FIGS. 1 and 2 can be obtained. The grassproof structure of the present invention can ensure the fixing of the grassproof sheet 10 to the grassproof area by the spray material 21. Thus, in the case of the fixing method using the spray material 21, it can also prevent that the 2nd edge part 13 of the weed prevention sheet | seat 10 is curled by a storm or the like.

  The herbicidal sheet 10 contained in the herbicidal structure of the present invention is not particularly limited, and can be appropriately selected from commercially available herbicidal sheets, but in particular, flexible, waterproof and Those having a light-shielding property and having a sheet-like shape can be suitably used because they have good durability. As a specific example of the herbicidal sheet 10 used in the present invention, a modified asphalt-based herbicidal sheet having excellent flexibility, waterproofness and light shielding property, for example, disclosed in JP-A-2002-272348 (Patent Document 1). The modified asphalt herbicidal sheet thus obtained can be preferably used.

  The “modified asphalt-based herbicidal sheet” refers to a herbicidal sheet containing modified asphalt as a material. Specifically, the modified asphalt may be the same as the modified asphalt that can be used for the (b) layer and the (d) layer of the penetration-resistant grass protection sheet described later. The modified asphalt-based herbicidal sheet can be used by diverting an architectural waterproof sheet (modified asphalt-based waterproof sheet).

  As the modified asphalt type herbicidal sheet, not only a sheet composed of a single layer of modified asphalt but also a structure including a base material layer composed of a nonwoven fabric or the like between two modified asphalt layers can be used. .

  Moreover, the modified asphalt-based herbicidal sheet can further include a surface layer and a back surface layer. The surface layer can be the same as the (a) surface layer of the penetration-proof grass protection sheet described later. Moreover, a synthetic resin film can be used suitably for a back surface layer. As the synthetic resin film, specifically, a film selected from an HDPE film (high density polyethylene) and an OPP film (biaxially stretched polypropylene) can be suitably used. Moreover, the same thing as the (e) back surface layer of the penetration-proof type weedproof sheet mentioned later can be used.

  An example of the structure of the modified asphalt type herbicidal sheet is a structure having a surface layer, a modified asphalt layer, a base material layer, a modified asphalt layer, and a back surface layer in this order, but it is necessary to include all of these layers. It can also include additional layers.

  Moreover, as the weedproof sheet 10 contained in the weedproof structure of the present invention, it is particularly preferable to use a penetration-resistant weedproof sheet, which will be described later, which is one type of modified asphalt-based weedproof sheet.

  The dimensions of the weedproof sheet 10 can be selected as appropriate depending on the dimensions of the weedproof area and other construction conditions. For example, in the example shown in FIG. 1, a plurality of weedproof sheets 10 are connected in a weedproof sheet overlapping fusion part 17. Thus, the herbicidal structure of the present invention can be obtained by using the herbicidal sheet superimposing and fusing portions 17 of the plurality of herbicidal sheets 10 having dimensions selected as appropriate by bonding them together by the heat fusion method or the tape bonding method. Can be installed in any size grass protection area.

  The lateral ends 18 and 19 (shown as the upper or lower end in FIG. 1) of the weed control area are fixed to an existing structure such as concrete like the lateral end 18 as described above. The one end portion 12 can be fixed using a fixing method. Moreover, when fixing on the ground, it can fix using the fixing method of the above-mentioned 2nd edge part 13. FIG. Thus, the weedproof effect can be ensured by fixing the lateral ends 18 and 19.

  The weedproof structure of the present invention can be used in any place such as roads, railways, rivers, parks, afforestation gardens, etc., and the surrounding ground, surface and slope. Moreover, the grass protection structure of this invention can be installed in the grass protection area adjacent to existing structures, such as a pavement surface and a U-shaped hole. Moreover, especially when installing the weedproof structure of this invention in a slope, since the effect which contributes to the improvement of aesthetics, etc. is large, it is preferable. Such a slope is preferably any slope selected from a road slope, a promenade slope and a railway slope.

<Construction method of weedproof structure>
Next, the construction method of the weedproof structure of the present invention will be described with reference to FIGS.

  First, the grass protection sheet 10 is laid so as to cover the grass protection area and at least the upper surface of the side wall 26 closer to the grass protection area among the side walls of the U-shaped groove 25.

  Next, the first end portion 12 which is the end portion of the grass prevention sheet 10 on the side in contact with the U-shaped groove 25 is attached to an existing structure (such as a heat fusion method, a tape bonding method, a predetermined needle-like instrument 14). Fix to paved road 22). Specifically, the first end portion 12 can be more reliably fixed by fixing the herbicidal sheet 10 by a heat fusion method or a tape bonding method. Further, the first end portion 12 can be fixed to the paved road 22 by driving the needle-like instrument 14 through the weedproof sheet 10 into the paved road 22. Fixing by the heat fusion method or tape bonding method and fixing by the needle-like instrument 14 can be used in combination.

  Moreover, when the existing structure is the U-shaped groove 25, as shown in FIG. 4, the first end portion 12, which is the end portion on the side in contact with the U-shaped groove 25 of the weedproof sheet 10, It fixes to the U-shaped groove | channel 25 using the needle-shaped instrument 28 for U-shaped grooves. Specifically, the long nail 41 of the U-shaped grooved needle 28 is placed on the weedproof sheet 10 so that the short bar portion 43 of the U-shaped grooved needle-shaped instrument 28 is located inside the U-shaped groove 25. The first end 12 can be fixed to the U-shaped groove 25 by penetrating through the grass-proofing area. Further, when laying the grassproof sheet 10, the grassproof sheet 10 is laid so as to further cover at least a part of the inside of the side wall 26 closer to the grassproof area among the side walls of the U-shaped groove 25. It is preferable to do.

  As shown in FIGS. 1, 2, and 4, in the weedproof structure of the present invention, the second end 13 of the weedproof sheet 10 is passed through the weedproof sheet 10 to fix the second end 13. Then, it is preferable to fix the grass protection sheet 10 to the grass protection area 20 by driving the bent nail-like instrument 15 into the grass protection area 20. Further, for fixing the second end portion 13 of the weedproof sheet 10, it is more preferable to dispose a predetermined rod-shaped fixture 16 on the upper surface of the second end portion 13. For fixing the rod-shaped fixture 16, a predetermined bent nail-shaped device 15 is used, and the bent portion of the nail-shaped device penetrates the grass protection sheet 10 so that the bent portion of the nail-shaped fixture 16 is in contact with the rod-shaped fixture 16. This is preferably done by driving 15 in.

  In the construction method of the weedproof structure of the present invention, the upper surface and the second end of the second end 13 are fixed for fixing the second end 13 opposite to the first end 12 of the weedproof sheet 10. The spraying material 21 is sprayed on the upper surface of the second end 13 and the ground on the outer side of the second end 13 so as to straddle the outer ground of 13.

  By the construction method of the above-described weedproof structure, it is possible to obtain a weedproof structure with an improved aesthetic appearance that exhibits an excellent herbicidal effect over a long period.

<Penetration-proof grass protection sheet>
Next, a particularly preferred herbicidal sheet for use in the herbicidal structure of the present invention will be described. In the present specification and claims, the weedproof sheet described here is referred to as a “penetration-resistant weedproof sheet”. The penetration-resistant weedproof sheet is a kind of modified asphalt-based weedproof sheet. The penetration-resistant weedproof sheet is particularly preferably used for the weedproof structure of the present invention because it is excellent in preventing penetration of hard and sharp weed buds against the weedproof sheet.

<Aspects of penetration-proof grass protection sheet>
The penetration-proof grass protection sheet comprises (a) a surface layer containing inorganic particles or a synthetic resin containing inorganic particles, (b) a modified asphalt layer, (c) a base material layer, (d) a modified asphalt layer and ( e) a penetration-proof weedproof sheet in which at least 5 layers of a back surface layer containing a synthetic resin or a synthetic resin containing inorganic particles are laminated in this order, wherein (c) the base material layer comprises a woven fabric, a knitted fabric, and A core sheath comprising a base material A which is at least one selected from the group consisting of non-woven fabrics and a base material B having a scrim, wherein the woven fabric, knitted fabric and non-woven fabric of the base material A have a core portion and a sheath portion. It is a penetration-proof herbicidal sheet containing fibers having a structure, a core having a melting point of 200 ° C. or higher and a sheath having a melting point of 200 ° C. or higher, and (e) a synthetic resin for the back layer being a hard synthetic resin. .

The preferable aspect of a penetration-proof grass prevention sheet is shown below. In the penetration-proof weedproof sheet, these modes can be combined as appropriate.
(1) (e) At least one synthetic resin in which the hard synthetic resin of the back layer is selected from the group consisting of polypropylene, polyester, polycarbonate, polyamideimide, polyesterimide, polyamide, polyimide, polyvinyl chloride, and polyhalogenated polyvinyl It is.
(2) (e) The back layer is a biaxially stretched polypropylene film having a thickness of 10 to 50 μm.
(3) (c) The base material layer has a three-layer structure in which the base material A, the base material B, and the base material A are laminated in this order and adhered or heat-sealed.
(4) The core part and the sheath part are heat-sealed.
(5) The base material B has two or more sets of fiber bundles of a plurality of high-strength fibers that are parallel to each other at approximately equal intervals, and the different sets of fiber bundles cross each other at substantially equal angles. It is.
(6) At least a part of the contact portion between the base material A and the base material B is bonded or thermally fused with a resin having a melting point of 200 ° C. or higher and / or an adhesive that does not thermally decompose at 200 ° C. Yes.
(7) (c) The base material layer has a basis weight of 75 to 500 g / m ² .
(8) (a) The surface layer contains at least one or more flat inorganic particles selected from the group consisting of natural slate, talc and mica.

  Further, the penetration-proof grass protection sheet can be used for a grass protection structure in which the grass protection sheet is laid.

<Effect of penetration-proof grass protection sheet>
With a penetration-proof grass protection sheet, it has light-shielding and weather resistance to prevent grass growth on the ground, surface, especially slopes, such as roads, railways, rivers, parks and afforestation gardens, and their surroundings. Thus, it is possible to obtain a herbicidal sheet excellent in mechanical properties and water impermeability, and further excellent in preventing penetration of hard and sharp weed buds against the herbicidal sheet.

<Details of penetration-proof grass protection sheet>
In FIG. 8, typical sectional drawing of a penetration-proof type weedproof sheet is shown. The penetration-proof grass protection sheet includes (a) a surface layer 1 containing inorganic particles or a synthetic resin containing inorganic particles, (b) a modified asphalt layer 2, (c) a base material layer 3, and (d) a modified asphalt. It is a penetration-proof weedproof sheet in which at least five layers of the layer 4 and (e) the back surface layer 5 which is a synthetic resin or a synthetic resin containing inorganic particles are laminated in this order. The penetration-proof grass protection sheet is light-shielding and weather-resistant to prevent grass growth on the ground, surfaces, especially slopes, such as roads, railways, rivers, parks and afforestation gardens, and their surroundings. It has excellent properties, mechanical properties, and imperviousness, and also has excellent penetration prevention properties against hard and sharp weed buds. Hereinafter, the penetration-resistant weedproof sheet will be described in detail.

<(C) Base material layer>
(C) A base material layer contains the base material A which is at least 1 chosen from the group which consists of a woven fabric, a knitted fabric, and a nonwoven fabric, and the base material B which has a scrim.

<(C) Base material A of base material layer>
The woven fabric, knitted fabric and non-woven fabric constituting the base material A include fibers having a core-sheath structure having a core portion and a sheath portion. In the present specification, the “fiber” includes a single fiber, two or more fibers, a bundle of two or more fibers (fiber bundle), and a yarn (thread) multiplied by two or more fibers.

  The base material A is a base material selected from woven fabric, knitted fabric and non-woven fabric, and can be used in combination of two or more woven fabric, knitted fabric or non-woven fabric. As the base material A, a woven fabric, a knitted fabric, and / or a non-woven fabric made of a fiber having a core-sheath structure in which a core has a melting point of 200 ° C. or higher and a sheath has a melting point of 200 ° C. or higher can be used. Further, as the base material A, a woven fabric, a knitted fabric and / or a nonwoven fabric made of fibers of the core-sheath structure and a woven fabric, a knitted fabric and / or a nonwoven fabric made of fibers having a melting point of 200 ° C. or higher can be used in combination. . The upper limit of the melting point of the fiber is not particularly limited. The upper limit of the melting point of the resin is not particularly limited, but is preferably 500 ° C. or less, and more preferably 400 ° C. or less, from the viewpoint of ease of production and cost.

<(C) Base material A of base material layer: core-sheath structure>
(C) The core-sheath structure fiber that can be used as the base material A of the base material layer is a structure in which one component (sheath part) wraps at least a part of the surface of another component (core part). Means a fiber having The fiber having a core-sheath structure preferably has a structure in which the sheath part covers the surface of the core part by 50% or more, further 70% or more, particularly 90% or more. In particular, the core-sheath structure fiber is most preferably a fiber having a structure in which the sheath part completely wraps around the surface of the core part.

  The core is a fiber having a melting point of 200 ° C. or higher. Moreover, it is preferable that the core part is a low water-absorbing synthetic resin or an inorganic substance because it is excellent in heat resistance in the process of producing a penetration-proof grassproof sheet and in stability of physical properties during long-term use. For the core, a synthetic resin or an inorganic substance having a water absorption rate (24 hours, 23 ° C.) of preferably 1% or less, more preferably 0.9% or less, and particularly preferably less than 0.8% can be preferably used. As a specific core material, it is preferable from the viewpoint of water absorption and mechanical strength to use low water-absorbing nylon 11, nylon 12, synthetic resin such as polyester and glass, or fibers made of inorganic materials.

  The material of the sheath is preferably a resin having a melting point of 200 ° C. or higher because of excellent heat resistance in the process of producing a penetration-proof grassproof sheet and stability of physical properties during long-term use. As the resin having a melting point of 200 ° C. or higher, any natural or synthetic resin having a melting point of 200 ° C. or higher can be used. Particularly, polyamide, polycarbonate, polyphenylene oxide, polyethersulfone, polyamideimide having a melting point of 200 ° C. or higher can be used. One or more resins selected from polyester imide, polyimide, polysulfone, polyether and the like can be used. In particular, one or more selected from low water-absorbing nylon 11 and nylon 12 can be suitably used because they have excellent physical properties during long-term use. Further, as the resin having a melting point of 200 ° C. or higher, partially crosslinked or crosslinked rubber can be used.

  Moreover, it is preferable that the core part and the sheath part are heat-sealed. The thermal fusion can be performed by applying a temperature higher than the melting point of at least one of the core material and the sheath material. The core part and the sheath part are heat-sealed, so that excellent shape stability can be obtained even when immersed in modified asphalt in a molten state (less than 200 ° C.) in the process of manufacturing a penetration-proof grassproof sheet. Can be obtained.

  When a woven fabric, a knitted fabric, or a non-woven fabric made of a core-sheath fiber having a melting point of 200 ° C. or higher is used as the base material A, Adhered woven fabric, knitted fabric, non-woven fabric, etc. (ii) Partially woven fabric, knitted fabric, non-woven fabric bonded with an adhesive and / or resin that does not thermally decompose at 200 ° C. (iii) Some It is preferable to use a woven fabric, a knitted fabric, a non-woven fabric, or the like that is heat-sealed. In addition, although the upper limit of melting | fusing point of resin and the thermal decomposition temperature of an adhesive agent is not specifically limited, 500 degreeC or less is preferable from the point of the ease of manufacture and cost, and 400 degreeC or less is more preferable.

  In the case of using a woven fabric, a knitted fabric or a non-woven fabric partly bonded with a resin having a melting point of 200 ° C. or higher as the base material A, Any synthetic resin can be used, and in particular, selected from polyamide, polycarbonate, polyphenylene oxide, polyethersulfone, polyamideimide, polyesterimide, polyimide, polysulfone and polyether having a melting point of 200 ° C. or higher. One or more types of resins can be used. In particular, one or more selected from nylon 11 and nylon 12 having low water absorption can be suitably used. As the resin having a melting point of 200 ° C. or higher, partially crosslinked or crosslinked rubber can be used.

  As the substrate A, (ii) a woven fabric, a knitted fabric, or a non-woven fabric partially bonded with an adhesive and / or resin that is not thermally decomposed at 200 ° C. can be used. An adhesive that does not thermally decompose at 200 ° C. means that, in thermogravimetric analysis, the weight loss rate is 1% or less, further 0.5% or less at 200 ° C. under the condition of a heating rate of 5 ° C./min in air. Especially 0% natural or synthetic resin.

  As an adhesive that does not thermally decompose at 200 ° C., an inorganic adhesive or an organic adhesive that does not thermally decompose at 200 ° C. can be used. Examples of adhesives that do not thermally decompose at 200 ° C. include urethane adhesives, acrylic adhesives, polyamide adhesives, epoxy adhesives, polyester adhesives, nylon / epoxy adhesives, and elastomer / epoxy adhesives. Agent, nitrile / phenolic adhesive, urethane / epoxy adhesive, polyester / epoxy adhesive, polyisocyanate adhesive, polyethyleneimine adhesive, melamine adhesive, urea adhesive, phenolic adhesive, One or more selected from a polychloroprene adhesive, a nitrile rubber adhesive, a recycled rubber adhesive, an SBR adhesive, a natural rubber adhesive, and the like can be used.

  As an adhesive that does not thermally decompose at 200 ° C., it is preferable to use a natural or synthetic resin having crosslinkability such as an epoxy resin or a synthetic resin paint that can be used for the surface layer (a) described later.

<(C) Base material A of base material layer: Combined use of fibers having a core-sheath structure and fibers having a melting point of 200 ° C. or higher>
Moreover, as the base material A, a woven fabric, a knitted fabric and / or a nonwoven fabric made of fibers having a melting point of 200 ° C. or higher can also be used. The woven fabric, knitted fabric and / or non-woven fabric made of fibers having a melting point of 200 ° C. or higher is made of fibers having a core-sheath structure in which the core portion is made of fibers having a melting point of 200 ° C. or higher and the sheath portion is made of resin having a melting point of 200 ° C. or higher. The substrate A is preferably used in combination with a woven fabric, a knitted fabric and / or a non-woven fabric. As the fiber having a melting point of 200 ° C. or higher, fibers composed of organic fibers or inorganic fibers having a melting point of 200 ° C. or higher, such as natural, semi-synthetic and synthetic resin fibers having a melting point of 200 ° C. or higher, and inorganic glass can be used. .

  As the fiber having a melting point of 200 ° C. or higher, an organic fiber or an inorganic fiber made of a resin having a melting point of 200 ° C. or higher, or containing a resin having a melting point of 200 ° C. or higher, such as fiber or glass, can be used. . The upper limit of the melting point of the fiber is not particularly limited.

  In the case of using a woven fabric, a knitted fabric or a non-woven fabric composed of a core-sheath fiber having a melting point of 200 ° C. or higher and a fiber having a melting point of 200 ° C. or higher as the substrate A, the core-sheath fiber and / or the melting point of 200 ° C. Of these fibers, (i) woven fabric, knitted fabric, non-woven fabric, etc. partially bonded with a resin having a melting point of 200 ° C. or higher, and (ii) an adhesive and / or resin that does not thermally decompose at 200 ° C. It is preferable to use (iii) a woven fabric, a knitted fabric, a non-woven fabric or the like partially bonded by heat, such as a bonded woven fabric, a knitted fabric, or a non-woven fabric. In addition, although the upper limit of melting | fusing point of resin and the thermal decomposition temperature of an adhesive agent is not specifically limited, 500 degreeC or less is preferable from the point of the ease of manufacture and cost, and 400 degreeC or less is more preferable.

  In the case of using a woven fabric, a knitted fabric or a non-woven fabric partly bonded with a resin having a melting point of 200 ° C. or higher as the base material A, Any synthetic resin can be used, and in particular, selected from polyamide, polycarbonate, polyphenylene oxide, polyethersulfone, polyamideimide, polyesterimide, polyimide, polysulfone and polyether having a melting point of 200 ° C. or higher. One or more types of resins can be used. In particular, one or more selected from nylon 11 and nylon 12 having low water absorption can be suitably used. As the resin having a melting point of 200 ° C. or higher, partially crosslinked or crosslinked rubber can be used.

  As the substrate A, (ii) a woven fabric, a knitted fabric, or a non-woven fabric partially bonded with an adhesive and / or resin that is not thermally decomposed at 200 ° C. can be used. An adhesive that does not thermally decompose at 200 ° C. means that, in thermogravimetric analysis, the weight loss rate is 1% or less, further 0.5% or less at 200 ° C. under the condition of a heating rate of 5 ° C./min in air. Especially 0% natural or synthetic resin.

  As an adhesive that does not thermally decompose at 200 ° C., an inorganic adhesive or an organic adhesive that does not thermally decompose at 200 ° C. can be used. Examples of adhesives that do not thermally decompose at 200 ° C. include urethane adhesives, acrylic adhesives, polyamide adhesives, epoxy adhesives, polyester adhesives, nylon / epoxy adhesives, and elastomer / epoxy adhesives. Agent, nitrile / phenolic adhesive, urethane / epoxy adhesive, polyester / epoxy adhesive, polyisocyanate adhesive, polyethyleneimine adhesive, melamine adhesive, urea adhesive, phenolic adhesive, One or more selected from a polychloroprene adhesive, a nitrile rubber adhesive, a recycled rubber adhesive, an SBR adhesive, a natural rubber adhesive, and the like can be used.

  As an adhesive that does not thermally decompose at 200 ° C., it is preferable to use a natural or synthetic resin having crosslinkability such as an epoxy resin or a synthetic resin coating that can be used for the surface layer (a) described later.

<(C) Base material B of base material layer>
From the point of increasing the mechanical strength of the weedproof sheet, in the penetration-resistant weedproof sheet, (c) the base material B of the base material layer has a scrim made of fibers having a melting point of 200 ° C. or higher. preferable. The scrim means a plain woven or twill woven fabric. In other words, the scrim has two or more sets each having a plurality of fibers and / or yarns that are substantially equally spaced in parallel to each other, and different sets of fibers and / or yarns cross each other at substantially equal angles. It is. As an example, it is possible to use a scrim having a shape in which two sets of a plurality of parallel and equally spaced fibers and / or yarns intersect each other at substantially right angles. It is also possible to use scrims in which the three sets cross each other at an angle of about 60 degrees. The lower limit of the fiber and / or yarn spacing is preferably a scrim of 3 mm or more, more preferably 4 mm or more, more preferably 5 mm or more, particularly preferably 6 mm or more, from the viewpoint of suppressing the weight and cost of the scrim. Moreover, the upper limit of the space | interval of a fiber and / or a thread | yarn from the point of required mechanical strength becomes like this. Preferably it is 30 mm or less, More preferably, it is 20 mm or less, More preferably, it is 18 mm or less.

  Moreover, it is preferable that the fiber and / or thread | yarn which comprise a scrim have melting | fusing point 200 degreeC or more. Moreover, since it has high intensity | strength, it is preferable that the fiber which comprises a scrim is a bundle | flux (high-strength fiber bundle) of two or more high-strength fibers. As the high-strength fiber of the high-strength fiber bundle, one or more kinds selected from carbon fiber, aramid fiber, steel fiber, nylon fiber, polyester fiber and glass fiber can be suitably used. From the viewpoint of price and availability, glass can be used. Fibers can be suitably used. The upper limit of the melting point of the fiber is not particularly limited.

<(C) Structure of base material layer>
(C) The base material layer preferably has a three-layer structure in which the base material A, the base material B, and the base material A are laminated in this order. The “three-layer structure” refers to a structure in which the base material A, the base material B, and the base material A are arranged and bonded in this order. In addition, since the base material B has a scrim, there are portions where fibers and / or yarns are not present. In the present specification, such a portion is also referred to as a “three-layer structure”. (C) Since the base material layer has a three-layer structure, the upper surface side and the lower surface side of the base material B located in the middle have a homogeneous structure. When the sheet is laid, good flatness can be obtained, and warping of the end portion of the weedproof sheet can be avoided.

  (C) The base material layer is formed by adhering the base material A and the base material B and by adhering two base materials A at a portion where the base material B does not exist. From the viewpoint of ensuring the adhesion of the base material, (c) the base material layer is a resin having a melting point of 200 ° C. or higher and / or 200 ° C. at least part of the contact portion between the base material A and the base material B. It is preferable to adhere by an adhesive that does not thermally decompose. Or it is preferable that at least one part of the contact part of the base material A and the base material B is heat-sealed at the temperature of 200 degreeC or more. The same applies to a portion where two substrates A are bonded or fused. The base material A and the base material B are bonded by a resin having a melting point of 200 ° C. or higher and / or an adhesive that is not thermally decomposed at 200 ° C., or by being heat-sealed at a temperature of 200 ° C. or higher. (C) Even if the (c) base material layer is immersed in the modified asphalt in a molten state (less than 200 ° C.) in the manufacturing process of the penetration-proof grassproof sheet using the base material layer, (c) the base material layer The physical properties are not impaired, and excellent shape stability can be obtained.

(C) The lower limit of the basis weight of the base material layer (weight per unit area) is 75 g / m ² , preferably 100 g / m ² , more preferably 120 g, from the viewpoint of maintaining the strength of the penetration-proof grass protection sheet. / M ² , particularly preferably 140 g / m ² . Moreover, (c) The upper limit of the basis weight of a base material layer is 500 g / m < ² > or less from the point of ensuring favorable workability | operativity at the time of constructing a penetration-proof type weedproof sheet, and holding down cost, Preferably 400 g / m ² , more preferably 200 g / m ² . As a specific example of the basis weight of the base material layer including the scrim, a material having a weight of 155 g / m ² can be used. (C) When the basis weight of the base material layer is not less than the lower limit (75 g / m ² ), preferable tensile strength and tear strength can be obtained, and when it is not more than the upper limit (500 g / m ² ), there is no penetration resistance. It is preferable because the strength characteristics of the mold herbicidal sheet are appropriate and the weight of the sheet is not too large, and the laying workability does not deteriorate.

<(A) Surface layer>
(A) The surface layer is a layer containing inorganic particles or a synthetic resin containing inorganic particles. (A) The surface layer is preferably a layer made of inorganic particles or a synthetic resin containing inorganic particles. (A) As the inorganic particles used for the surface layer, flat inorganic particles of mineral substances such as natural slate sand, mica and talc can be used. The inorganic particles can be used alone or in combination. In the penetration-proof weedproof sheet, (a) by using flat inorganic particles in the surface layer, the entire penetration-proof weedproof sheet does not peel off even in long-term use without relying on the application of weather-resistant paint. Moreover, discoloration and fading are small, and the state immediately after the construction of the penetration-proof grassproof sheet can be maintained.

  Furthermore, the penetration-resistant weed-proof sheet has a structure in which flat inorganic particles and modified asphalt compound are laminated. There is an effect that serious damage such as perforation hardly occurs.

  The particle size of the inorganic particles may be any as long as there is no problem in use, preferably 0.1 to 10 mm, more preferably 0.3 to 8 mm, still more preferably 0.5 to 6 mm, particularly preferably. Is preferably in the range of 1 to 5 mm. The “particle diameter” refers to the length of the longest of the straight lines connecting any two points of the inorganic particles when the inorganic particles are flat or the like.

  When the inorganic particles are flat or the like, the length of the longest line among the straight lines connecting any two points of the inorganic particles is X, and the longest of the straight lines connecting any two points of the inorganic particles perpendicular to the straight line When the length is Y and the thickness of the thickest portion of the flat inorganic particles is Z, the value of Y / X is preferably in the range of 0.2 to 1, more preferably 0.3 to 0.9. More preferably, the range of 0.5 to 0.8 can be suitably used. The value of Z / X is preferably in the range of 0.002 to 0.4, more preferably in the range of 0.01 to 0.2, and still more preferably in the range of 0.02 to 0.1. A thing can be used conveniently.

(A) in the surface layer, the inorganic particles per penetration type weed sheet surface 1 m ² is preferably 100 to 2000 g / ^{m 2,} more preferably 200~1500g / ^{m 2,} more preferably 400~1200g / m A range of ² is preferred.

  As the inorganic particles, those obtained by adding, spraying, applying or impregnating at least one selected from water repellents, paints, pigments, thickeners, light fasteners, weathering agents and the like can be used.

  (A) In the surface layer, the synthetic resin containing inorganic particles can be used as a coating film, a sheet or a film by a method such as bonding, coating, spraying and impregnation to the modified asphalt layer (b). . As the synthetic resin containing inorganic particles, those containing inorganic particles and a synthetic resin paint can be used. As the synthetic resin containing inorganic particles, it is preferable to use a compound in which 3 to 250 parts by weight of inorganic particles, further 5 to 200 parts by weight, particularly 10 to 180 parts by weight are blended with 100 parts by weight of the synthetic resin coating. The synthetic resin containing inorganic particles is preferably added with at least one selected from water repellents, pigments, thickeners, light fasteners, weathering agents, and the like as necessary.

(A) In the surface layer, the amount of the inorganic particles contained in the synthetic resin is preferably 100 to 2000 g / m ² , more preferably 200 to 1500 g / m ² per 1 m ² of the penetration-proof grass protection sheet surface. m ² , more preferably 400 to 1200 g / m ² .

  (A) As a synthetic resin of the surface layer, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyolefin such as ethylene-acrylic acid derivative, polyurethane, polyester, polycarbonate, polyphenylene oxide, polysulfone, polyethersulfone, polyamideimide, Olefin polymer having two or more double bonds in the main chain, such as polyesterimide, polyamide, acrylic resin, polybutadiene, styrene-butadiene copolymer, vinyl polymer, and olefin having two or more double bonds in the main chain and main chain One or more selected from a copolymer with an olefin having one double bond may be used. It is preferable to use a synthetic resin having excellent weather resistance. It is preferable to use a synthetic resin having excellent light resistance. As the synthetic resin, it is preferable to use a resin having excellent flexibility.

  (A) In the surface layer, as the synthetic resin paint, one or more selected from polyurethane, acrylic resin, ethylene-vinyl acetate copolymer, polyester, polyamide, polyimide, polybutadiene, styrene-butadiene copolymer, and the like are used. be able to. It is preferable to use a synthetic resin paint having excellent weather resistance. As the synthetic resin paint, it is preferable to use an excellent flexibility. In particular, as the synthetic resin coating, at least one monomer selected from acrylic acid esters and methacrylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, and butyl methacrylate is used. A polymer or a copolymer of at least one monomer and an α-olefin such as ethylene or another vinyl monomer such as styrene is preferable.

<Modified asphalt of (b) layer and (d) layer>
As the modified asphalt of the (b) layer and the (d) layer, those containing asphalt and polymer, those containing three components of asphalt, polymer and inorganic filler can be used. As the modified asphalt of the (b) layer and the (d) layer, it is preferable to use those containing 10 to 40 parts by weight of the polymer and 0 to 20 parts by weight of the inorganic filler with respect to 100 parts by weight of the asphalt.

  As the modified asphalt, it is possible to use one prepared by heating and mixing at 120 to 200 ° C. for 3 to 30 hours, such as one containing asphalt and polymer, one containing three components of asphalt, polymer and inorganic filler. It is preferable because it is excellent in moisture resistance, stretchability and the like.

  In addition to the components described above, modified asphalt includes process oil, petrolatum, ceresin, petroleum resin, and other water repellents, pigments, thickeners, light-proofing agents, and weathering agents that are commonly used in blending synthetic resins and rubbers. An inorganic or organic compounding agent such as may be added.

  In the modified asphalt of the (b) layer and the (d) layer, the asphalt may be natural asphalt or asphaltite, natural asphalt, blown asphalt, petroleum asphalt such as cutback asphalt, or these asphalts A mixture or the like is preferred.

  In the modified asphalt of the (b) layer and the (d) layer, polymers include natural rubber, synthetic rubber, a mixture of natural rubber and synthetic rubber, polyethylene, ethylene vinyl acetate copolymer, ethylene and acrylic acid derivatives. Copolymer, polypropylene, polybutene-1, poly-4-methylpentene-1, polystyrene, acrylonitrile / styrene copolymer, ABS resin, polyvinyl chloride, polyacrylonitrile, and a polymer of styrene and butadiene (for example, SBS, One or more selected from SBR and the like can be used. A rubber system such as SBS is particularly suitable.

  In the modified asphalt of the (b) layer and the (d) layer, as the inorganic filler, calcium carbonate, magnesium silicate, calcium silicate, aluminum silicate, anhydrous silicic acid, clay, carbon black, talc, mica, sulfuric acid One or more selected from particulate inorganic fillers such as barium, diatomaceous earth, and silica, and fibrous inorganic fillers such as asbestos and glass fiber can be used.

  The modified asphalt of the (b) layer and the (d) layer has a penetration of preferably 10 dmm to 200 dmm, more preferably 15 dmm to 100 dmm, more preferably 20 dmm to 50 dmm, and particularly preferably 25 dmm. The range of ˜35 dmm is preferable because of excellent flexibility.

  In the penetration-proof weedproof sheet, by using the modified asphalt having the above composition as the (b) layer and the (d) layer, particularly when arranged on the slope, it has excellent water impermeability at the top of the slope. A layer can be formed. For this reason, not only can the water essential for the growth of weeds be blocked, but when the slope is constructed with embankments, the water on the slope itself can be removed with the infiltration of rainwater from the upper part of the slope (slope). By preventing it effectively, it is possible to avoid the collapse of the slope ground due to heavy rain.

<(E) Back layer>
As for a penetration-proof type weedproof sheet, (e) the back layer contains a synthetic resin containing a synthetic resin or inorganic particles. (E) The back layer is preferably a synthetic resin film or a synthetic resin film containing inorganic particles.

  (E) The synthetic resin of the back layer is a hard synthetic resin. By using a film made of a hard synthetic resin as the back layer, it is possible to prevent weed buds such as chigaya from penetrating the (e) back layer of the penetration-proof weedproof sheet. In addition, taking advantage of the surface smoothness of the synthetic resin film, the growth direction of weed buds can be induced in a direction parallel to the back surface of the sheet.

  (E) As the synthetic resin of the synthetic resin film of the back layer, it is preferable to use a resin excellent in light resistance and weather resistance.

  (E) Specific examples of the synthetic resin for the back surface layer include hard synthetic resins such as polypropylene, polyester, polycarbonate, polyamideimide, polyesterimide, polyamide, polyimide, polyvinyl chloride, polyvinylidene chloride, and other polyhalogenated polyvinyls. A film-like material can be preferably used. In particular, an OPP film (biaxially stretched polypropylene film) produced through a biaxial stretch molding process can be suitably used.

  (E) As a back surface layer used for a penetration-proof type weedproof sheet, the thickness is preferably 10 to 50 μm, more preferably 12 to 40 μm, and still more preferably 15 to 30 μm. Can be used for (E) When the hard synthetic resin film which is a back surface layer is below the upper limit of the said range (10-50 micrometers), the flexibility of a penetration-proof weedproof sheet is not impaired, and a shoot of Tigaya is a penetration-proof weedproof sheet The effect of preventing the penetration is increased. For this reason, if a through-proof type weedproof sheet is manufactured and then packed in a roll, there is little possibility of problems such as wrinkling on the surface of the sheet, and workability during laying may be impaired in construction work. It is preferable because it is small. Moreover, (e) When the synthetic resin film of a back surface layer is more than the lower limit of the said range (10-50 micrometers), the effect which prevents that the hard and sharp chigaya bud penetrates a penetration-proof type weedproof sheet becomes large. Therefore, it is preferable.

  (E) Rubber can be added to the synthetic resin of the back layer. The rubber that can be added to the synthetic resin is preferably a thermoplastic low crystalline elastomer having no clear yield point or a thermoplastic amorphous elastomer having no clear melting point and yield point, and an elastomer having rubber elasticity at room temperature. Can be used. One or more thermoplastic elastomers selected from styrene elastomers, olefin elastomers, polyester elastomers, polyamide elastomers, and the like can be used.

  Examples of styrene elastomers include styrene-butadiene-styrene copolymers (SBS, etc.), hydrogenated styrene-butadiene-styrene copolymers (SEBS, etc.), hydrogenated styrene-butadiene copolymers (HSBR, etc.), hydrogenated styrene. -Butadiene-styrene copolymers (including all random copolymers, block copolymers, graft copolymers, etc.) such as butadiene-olefin crystal block copolymers (SEBC, etc.) and their hydrogenated products, water Styrene-isoprene copolymer (SEP, etc.), hydrogenated styrene-vinylisoprene copolymer (V-SEPS, etc.), styrene-isoprene-styrene copolymer (SIS, etc.), hydrogenated styrene-isoprene-styrene copolymer Isoprene-styrene copolymers (random copolymers, Click copolymer, it may be used one or more selected from such as all inclusive) and its hydrogenated product of a graft copolymer.

  As the polyolefin-based elastomer, amorphous or low-crystalline α-olefin (co) polymer such as amorphous polypropylene, a mixture of polyolefin and olefin-based rubber, or the like can be used. As the polyolefin elastomer, ethylene-propylene elastomer (EPR, etc.) and ethylene butene-1 elastomer (EBM, etc.) can be used. As the polyester elastomer, an elastomer made of a polyester-polyether copolymer, a polyester-polyester copolymer, or the like can be used. As the polyamide-based elastomer, an elastomer made of a polyamide-polyester copolymer, a polyamide-polyether copolymer, or the like can be used. Two or more of the above elastomers may be mixed and used.

  (E) As the rubber that can be added to the synthetic resin of the back layer, specifically, one or more selected from polybutadiene, styrene-butadiene copolymer, polyisobutylene, chloroprene rubber, nitrile rubber, and the like can be used. .

  (E) When the back layer includes a synthetic resin containing inorganic particles, as inorganic particles, calcium carbonate, magnesium silicate, calcium silicate, aluminum silicate, anhydrous silicic acid, clay, carbon black, talc, One or more selected from mica, barium sulfate, diatomaceous earth, silica and the like can be used.

<Manufacturing method of penetration-proof grass protection sheet>
Next, the manufacturing method of a penetration-proof type weedproof sheet is demonstrated.

  A predetermined sheath portion is heat-sealed to the surface of the predetermined core portion to produce a fiber having a core-sheath structure. The base material A is obtained by producing a woven fabric, a knitted fabric and / or a non-woven fabric using the fibers of the core-sheath structure. Next, the base material B having a predetermined scrim is sandwiched between the two base materials A. By laminating the base material A, the base material B, and the base material A in this order with a resin having a melting point of 200 ° C. or higher and / or an adhesive that is not thermally decomposed at 200 ° C., or by heat-sealing. A sheet-like (c) substrate layer can be obtained.

  Next, the (c) base material layer produced as described above is immersed and passed in a predetermined modified asphalt heated and mixed at 170 ° C. or higher and lower than 200 ° C., and (c) both surfaces of the base material layer. A three-layer sheet provided with a predetermined asphalt layer (b) and (d) is prepared. (A) A surface layer is formed by adhering predetermined inorganic particles or a synthetic resin containing predetermined inorganic particles to one surface (surface) of the three-layer sheet. Further, a sheet including a predetermined synthetic resin or a synthetic resin containing inorganic particles is bonded to the other surface (back surface), and (e) a back surface layer is formed to obtain a penetration-proof grassproof sheet. be able to.

<Characteristics of penetration-proof grass protection sheet>
The penetration-resistant weedproof sheet and other weedproof sheets used in the present invention preferably have the following characteristics.

  The light transmittance of the herbicidal sheet used in the present invention is preferably 10% or less, more preferably 5% or less, and still more preferably 0%. When the light transmittance is within the above range, it is preferable because weed growth can be effectively prevented.

  The penetration resistance of the weedproof sheet used in the present invention is preferably 100 N or more, more preferably 150 N or more, still more preferably 200 N or more, and particularly preferably 250 N or more. The penetration resistance is preferably in the above range because weed growth can be effectively prevented and suppressed. “Penetration resistance” is a measured value based on ASTM D 4833.

  The tensile strength of the herbicidal sheet used in the present invention is preferably 50 N / cm or more, more preferably 80 N / cm or more, still more preferably 120 N / cm or more, and particularly preferably 135 N / cm or more. “Tensile strength” is a measured value based on JIS A6013. When the weedproof sheet has a tensile strength in the above range, good continuous productivity is obtained in the process of manufacturing the weedproof sheet, and excellent handling is obtained in the construction process of the weedproof sheet. Can obtain excellent durability.

  The tensile elongation of the herbicidal sheet used in the present invention is preferably 15% or more, more preferably 30% or more, and still more preferably 40% or more. “Tensile elongation” is a measured value based on JIS A6013. In the above-mentioned range, because it is suitable for unevenness of the ground due to moderate flexibility, it is excellent in handling at the time of construction and excellent in durability. Moreover, since it is excellent in continuous productivity in the process of manufacturing a herbicidal sheet, it is preferable.

  The tear strength of the herbicidal sheet used in the present invention is preferably 50 N or more, more preferably 70 N or more, still more preferably 90 N / cm or more, and particularly preferably 110 N / cm or more. “Tear strength” is a measured value based on JIS A6013. When the weedproof sheet has a tear strength in the above range, good continuous productivity is obtained in the process of manufacturing the weedproof sheet, and excellent handling is obtained in the construction process of the weedproof sheet. Can obtain excellent durability. In addition, if the tear strength of the weedproof sheet is within the above range, even when the end of the weedproof sheet is fixed using a fixing pin, the durability of the fixed location (location where stress is concentrated) is sufficiently secured. can do.

  In the weedproof sheet used in the present invention, the total thickness of the five layers from the (a) surface layer to the (e) back layer is preferably in the range of 1 mm to 10 mm, more preferably in the range of 1.5 mm to 8 mm, and still more preferably. Is preferably in the range of 2 mm to 6 mm, particularly preferably in the range of 3 mm to 5 mm, since the handling at the time of construction and the quality of the heat-sealed portion of the adjacent herbicidal sheet can be secured sufficiently stably.

  In the weedproof sheet used in the present invention, the ratio between the longitudinal direction and the transverse direction of the tensile strength is preferably in the range of 0.70 to 1.50, more preferably in the range of 0.72 to 1.40, and still more preferably. The range of 0.74 to 1.35, particularly preferably the range of 0.75 to 1.30, the physical properties such as tensile strength and tear strength do not depend on the orientation of the sheet, and stable durability is achieved. Since it is obtained, it is preferable.

  In the weedproof sheet used in the present invention, the ratio between the longitudinal direction and the transverse direction of the tear strength is preferably in the range of 0.75 to 1.25, more preferably in the range of 0.80 to 1.20, and still more preferably. The range of 0.83 to 1.18, particularly preferably the range of 0.86 to 1.16, the physical properties such as tensile strength and tear strength do not depend on the orientation of the sheet, and stable durability is achieved. Since it is obtained, it is preferable.

As an example of the mechanical strength, (e) a through-proof type herbicide using a biaxially stretched polypropylene film having a thickness of 20 μm and a base material layer having a basis weight of 155 g / m ² as a back layer and having a total thickness of 3 mm In the case of a sheet, values of a tensile strength of about 110 to 190 N / cm, a tensile elongation of about 50 to 70%, and a tear strength of about 85 to 140 N / cm can be obtained.

As described above, in the penetration-proof weedproof sheet, a base material layer including at least one base material A selected from a woven fabric, a knitted fabric and a non-woven fabric and a base material B having a scrim is used, Since a specific resin film is selected and used for the back surface layer, a penetration-resistant weedproof sheet having excellent tear strength and tensile strength and excellent dimensional stability can be obtained. In addition, the use of a penetration-proof grass protection sheet prevents the growth of grass on roads, railways, rivers, parks, afforestation, etc. In addition, it is possible to obtain a weed-proof structure that can prevent water from being sloped by concentrated heavy rain and the like, and is particularly excellent in preventing penetration of hard and sharp weed buds to a herbicidal sheet.
<Reference Example>

  The penetration-resistant weedproof sheet will be described below with reference to experimental examples as reference examples, but the penetration-resistant weedproof sheet used in the present invention is not limited thereto.

<Evaluation method>
1. Tensile strength, tensile elongation, tear strength: In accordance with JIS A6013, using universal material testing machine [UTM-10T manufactured by Orientec Co., Ltd.], tensile speed 100 mm / min, sample width 50 mm, chuck interval 100 mm, Uniaxial tensile strength was measured under the test temperature of 22 ° C.

2. Penetration resistance: performed in accordance with ASTM D 4833. Specifically, as shown in FIGS. 11A and 11B, the penetration resistance of the weedproof sheet is measured using a measuring jig 6 having a tip 7 at the lower end, as shown in FIG. The resistance force when the measuring jig 6 penetrates the weed-proof sheet 8 stretched and fixed as in (C) was measured under conditions of a penetration speed of 300 mm / min and a test temperature of 22 ° C.

<Experiments 1-3>
The following synthetic resin film was laid on the surface of the ground from which weeds were cut, and the weed control effect was confirmed after 2 months.
1) Synthetic resin film • Synthetic resin film a: PE film (polyethylene film), thickness = 30 μm, 1 m × 1 m.
Synthetic resin film b: OPP film (biaxially stretched polypropylene film), thickness = 20 μm, 1 m × 1 m.
Synthetic resin film c: OPP film (biaxially stretched polypropylene film), thickness = 60 μm, 1 m × 1 m.

  In Table 1 and FIG. 9, the result of having observed the penetration state of the bud of Chigaya of Experiments 1-3 is shown.

  In the case of Experiment 3 in which a PE film (polyethylene film) having a thickness of 30 μm was laid, fifteen spots where Tigaya sprouts penetrated the film and grew to 20 mm or more were observed. On the other hand, in the case of Experiment 1 in which an OPP film having a thickness of 20 μm (biaxially stretched polypropylene film) was laid, there was only one place where the buds of chigaya had grown through the film to 20 mm or more. In the case of Experiment 2 in which an OPP film (biaxially stretched polypropylene film) having a thickness of 60 μm was laid, no chigaya buds penetrated the film.

  From the above results, it can be said that when a PE film (polyethylene film) is used, a herbicidal effect is exhibited. Moreover, when an OPP film (biaxially stretched polypropylene film) is used, it can be said that a more excellent herbicidal effect can be achieved.

<Experimental Examples 1-7>
According to the following procedures, a herbicidal sheet was produced under the conditions shown in Table 2. In addition, Experimental Examples 3-7 correspond to a penetration-proof type weedproof sheet.

  The composite nonwoven fabric was passed through modified asphalt that was heated and melted and mixed at 190 ° C. to prepare a three-layer sheet in which layers of modified asphalt were provided on both sides of the composite nonwoven fabric.

The following three types of composite nonwoven fabric (base material layer) were used.
2) Composite nonwoven fabric-Composite nonwoven fabric A: manufactured by AKZO NOBEL, product name: colback; varieties: SNS155 (non-woven fabric-scrim-nonwoven fabric three-layer structure), upper layer and lower layer nonwoven fabric: core-sheath structure, sheath: nylon, Core: polyester, intermediate layer: scrim of glass fiber bundle (reinforcement in two directions in the length direction of the sheet and in the direction perpendicular to the length direction), basis weight = 155 g / m ² , 1 m × 6 m.
Composite nonwoven fabric B: manufactured by AKZO NOBEL, product name: colback; product type: SNS125 (non-woven fabric-scrim-nonwoven fabric three-layer structure), upper layer and lower layer nonwoven fabric: core sheath structure, sheath portion: nylon, core portion: polyester Intermediate layer: scrim of glass fiber bundle (two-way reinforcement in the length direction of the sheet and in the direction perpendicular to the length direction), basis weight = 125 g / m ² , 1 m × 6 m.
Composite nonwoven fabric C: manufactured by Freudenberg, product name: TERBOND • R150 (nonwoven fabric-glass fiber bundle two-layer structure), upper layer nonwoven fabric: core-sheath structure, sheath: nylon, core: polyester, lower layer: glass fiber Bundle (reinforced in one direction in the length direction of the sheet), basis weight = 150 g / m ² , 1 m × 6 m.

  Here, the product name: colback-variety: SNS155 and the product name: colback-variety: SNS125 are non-woven fabric and glass fiber scrim made of fibers of a core-sheath structure (sheath part: nylon, core part: polyester; PET). Are laminated in the order of non-woven fabric-scrim-non-woven fabric, and are integrally formed by heat-sealing nylon of the sheath portion of the non-woven fabric.

  As the modified asphalt, an SBS modified type penetration of 30 dmm or an APP modified type of penetration of 29 dmm was used.

The three-layer sheet of reforming one side of the asphalt layer (surface side), and the flat slate chips deposited in the range of ^{500g / m 2 ~1000g / m 2} .

The following synthetic resin film was bonded to the other surface (rear surface side) to produce a 5-layer sheet having a thickness of 3.2 mm, and wound around a core of cardboard in a roll shape to produce a herbicidal sheet.
3) Synthetic resin film Synthetic resin film d: HDPE film (high density polyethylene), thickness = 20 μm.
Synthetic resin film e: OPP film (biaxially stretched molded polypropylene), thickness = 20 μm.

  The herbicidal sheet could be produced continuously. Moreover, the light transmittance of any of the herbicidal sheets was 0% and did not transmit light.

  Table 3 shows the results of physical properties such as tensile strength of the obtained herbicidal sheet. The obtained weedproof sheet was laid on the surface of the ground from which weeds were cut, and the weedproof effect was evaluated two months later. Moreover, the result of having observed the penetration state of the bud of Chigaya is shown in FIG. In addition, “workability” in Table 3 is a comprehensive judgment of the ease of handling and ease of construction work of the herbicidal sheet, such as the weight of the sheet, flexibility, and the state of occurrence of wrinkles.

  As is clear from these results, a good herbicidal effect was obtained in any of the herbicidal sheets of Experimental Examples 1 to 7, but in particular, as the back layer, biaxially stretched molding which is a kind of hard synthetic resin When polypropylene was used, compared with the case where high-density polyethylene was used, the number of penetrating shoots of chigaya was reduced, and a higher herbicidal effect could be obtained.

In addition, when biaxially stretched polypropylene is used and a composite nonwoven fabric having a basis weight of 155 g / m ² is used as the base material layer, no chigaya buds penetrate (Experimental Example 6) or However, the number of penetrations was very small (Experimental Example 4, Experimental Example 5 and Experimental Example 7), and the length of the penetrated eye was less than 20 mm. After the penetrated chigaya bud penetrated the synthetic resin film on the back side, it could not grow larger than 20 mm. The fiber structure of the composite nonwoven fabric with a large basis weight and the modified asphalt layer impregnated in the composite nonwoven fabric This is thought to be due to a major obstacle to the growth of buds.

It is a plane schematic diagram of an example which installed the weedproof structure of the present invention on the slope. It is a cross-sectional schematic diagram of an example which installed the weedproof structure of this invention in the slope. It is a cross-sectional schematic diagram before spraying a spraying material when constructing the weedproof structure of the present invention. It is a cross-sectional schematic diagram of an example which installed the weed prevention structure of this invention in the slope which adjoins a U-shaped groove | channel. It is a plane schematic diagram of an example which installed the weed prevention structure of the present invention in the slope which adjoins a U-shaped groove. It is a cross-sectional schematic diagram of an example which installed the weed prevention structure of this invention in the slope which adjoins a U-shaped groove | channel. It is a schematic diagram of the needle-shaped instrument for U-shaped grooves. It is typical sectional drawing of a penetration-proof type weedproof sheet. It is a top view which shows the penetration state of the chigaya bud two months after laying a synthetic resin film. It is a top view which shows the penetration state of the bud of Chigaya two months after laying a weedproof sheet. It is explanatory drawing of the penetration test of a weedproof sheet, (A) Penetration resistance measuring device figure, (B) Sectional drawing of a measurement jig, (C) The penetration which performed the penetration test of the weedproof sheet using the measurement jig Each state diagram is shown.

Explanation of symbols

1: Surface layer (inorganic particles)
2: Modified asphalt layer 3: Base material layer 4: Modified asphalt layer 5: Back surface layer 6: Measuring jig 7: Front end of measuring jig 8: Weedproof sheet 10: Weedproof sheet 12: First End 13: Second end 14: Needle-like instrument 15: Bending nail-like instrument 16: Rod-like fixture 17: Weedproof sheet overlapping fusion part 18: Lateral end (fusing process)
19: Lateral end (pin fixing process)
21: Spray material 22: Paved road 25: U-shaped groove 26: Side wall of U-shaped groove (closer to grass protection area)
27: Side wall of U-shaped groove 28: Needle-like instrument for U-shaped groove 30: Slope 41: Long nail portion 42: Connection rod portion 43: Short rod portion

Claims (9)

A method for constructing a grass protection structure for installing a grass protection structure including a grass protection sheet in a grass protection area,
Arranging the weedproof sheet body in the weedproof area;
Fixing at least a part of the end of the weedproof sheet main body,
At least part of the fixed end and adjacent to it by spraying the spray material over at least part of the fixed end and the outer ground adjacent to at least part of the fixed end look including the step of covering an outer ground in spraying material to be,
The width for constructing the spray material is in the range of 0.3 to 10 m, and the maximum thickness is in the range of 50 to 300 mm.
The construction method of the weed prevention structure whose spraying material is a greening base material containing seeds, inorganic particles and fertilizer . The construction method according to claim 1 , wherein the inorganic particles are pearlite . The construction method according to claim 1 or 2 , wherein the greening base material further includes soil . The step of fixing at least a part of the end of the weedproof sheet main body,
Disposing a rod-shaped fixture on the upper surface of at least a portion of the end;
Using a rod-shaped fixture fixture, and fixing the rod-shaped fixture;
The construction method according to any one of claims 1 to 3, wherein the step of covering with the spray material includes covering the end portion on which the rod-shaped fixture is disposed with the spray material.   The construction method according to any one of claims 1 to 4, wherein the grass protection area is a grass protection area adjacent to an existing structure.   The construction method according to claim 1, wherein the grass prevention area includes a slope.   The construction method according to claim 6, wherein the slope is any slope selected from a road slope, a promenade slope, and a railway slope.   The construction method according to claim 1, wherein the weedproof sheet is a penetration-resistant weedproof sheet.   The weed prevention structure installed by the construction method of any one of Claims 1-8.