JP2009209569A - Weed-proof structure and method of forming the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weed-proof structure which prevents weed growth in the entire zone where weed-proofing is necessary, effectively prevents weed growth particularly in a shoulder surface adjacent to a pavement surface over a long period of time, and can be efficiently formed at low cost, and to provide a method of forming the weed-proof structure. <P>SOLUTION: The method of forming the weed-proof structure inclusive of a weed-proof sheet is implemented in the weed-proof zone of the shoulder surface adjacent to the pavement surface. According to the method, a step of laying the weed-proof sheet in the weed-proof zone is composed of: a step of arranging a first end of the weed-proof sheet A so as to overlap a pavement surface end; a step of fixing the first end of the weed-proof sheet A to the pavement surface end by thermal fusing or tape adhesion; a step of fixing the first end of the weed-proof sheet A to the pavement surface end by a first nail-type tool; and a step of fixing a second end of the weed-proof sheet A, opposite to the first end, to the ground surface of a slope by a second nail-type tool. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a grass prevention structure for grass prevention on a place where grass growth needs to be prevented, particularly a road shoulder surface, and a construction method thereof.

  It is often necessary to prevent the growth of grass such as weeds on roads, railroads, rivers, parks or afforestation gardens, and the surrounding ground, surfaces, especially the road shoulders, etc. because of the loss of aesthetics. In particular, on the road shoulder and the road shoulder adjacent thereto, the weeds overgrow 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. This patent document 3 discloses that when there is a guard rail on the slope, 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). Yes.
JP 2002-272348 A JP 2005-307518 A JP 2006-177122 A

  In order to prevent grass from growing on the road shoulder surface of the pavement, concrete may be placed on the road shoulder surface to form a thin concrete layer. In this case, after forming the formwork on the road shoulder surface, cast concrete is placed and leveled, the formwork is removed at the initial stage of hardening of the concrete, the joints are cut at regular intervals, and the concrete has a predetermined strength. It takes several days to develop. Also, in the long-term service process, cracks that occur in the thin concrete layer, and where various weeds grow from the joints provided in the process of forming the concrete layer, and the scenery around the pavement is damaged. There are many.

  The present invention can be constructed in a very short period of time, can be formed without the complexity of construction work, can form a grass prevention structure, prevent grass growth over the entire area where construction grass protection is required, especially adjacent to the pavement surface. It aims at obtaining the weed prevention structure which can prevent the grass growth of a road shoulder surface effectively over a long term, and its construction method.

  A first aspect of the present invention is a method for constructing a herbicidal structure including a herbicidal sheet that is constructed in a herbicidal area on the road shoulder surface adjacent to the pavement surface, and the step of laying the herbicidal sheet in the weedproof area includes The step of arranging the first end portion of the weedproof sheet A so as to overlap the end portion of the pavement surface, and the first end portion of the weedproof sheet A are fixed to the end portion of the pavement surface by heat fusion or tape bonding. A step, a step of fixing the first end portion of the weedproof sheet A to the paved surface end portion by a first nail-like instrument, and a second end portion on the opposite side of the first end portion of the weedproof sheet A Is fixed to the ground or a slope with a second nail-like instrument.

  Furthermore, the present invention is a construction method of a herbicidal structure including a herbicidal sheet to be constructed in a herbicidal area on the shoulder surface adjacent to the pavement surface, and the step of laying the herbicidal sheet in the herbicidal area includes: The process which arrange | positions the 1st end part of the weed prevention sheet A so that it may overlap with a pavement surface edge part, and the process of fixing the 1st end part of the weed protection sheet A to a pavement surface edge part by heat sealing | fusion or tape adhesion | attachment. And a step of fixing the first end portion of the weedproof sheet A to the paved surface end portion by the first nail-like tool, and a second end portion on the side opposite to the first end portion of the weedproof sheet A. The step of laying the second end portion opposite to the first end portion of the weedproof sheet B and the first end portion of the weedproof sheet B are ground or sloped by the second nail-like instrument. Fixing the overlap between the second end portion of the weedproof sheet A and the second end portion of the weedproof sheet B by heat fusion or tape bonding Therefore a method of constructing the weed structure characterized by comprising the step of integrating.

The preferable aspect of the construction method of this invention is shown below. In the present invention, these embodiments can be appropriately combined.
(1) The weedproof sheet A and / or the weedproof sheet B has stretchability in at least the plane direction, and the tensile elongation percentage of the weedproof sheet A and / or the weedproof sheet B is 20% or more.
(2) The weedproof sheet is a penetration-resistant weedproof sheet.
(3) The paved surface is a paved surface of an asphalt paved road, and the grass protection area is the shoulder surface of the asphalt paved road.

The 2nd of this invention is the weed prevention structure formed by the construction method of the weed prevention structure of this invention.

According to the present invention, construction can be carried out in a very short period of time, without the complexity of construction work, a grassproof structure can be formed, and grass growth is prevented over the entire area where construction grass protection is required, particularly adjacent to the pavement surface. A grass-proof structure that can effectively prevent the growth of grass on the road shoulder surface over a long period of time and a construction method therefor can be obtained.
Moreover, this invention can obtain the weed prevention structure which has outstanding herbicidal performance, and the outstanding durability, and its construction method by using a penetration-proof weedproof sheet as a weedproof sheet.

The present invention is a construction method of a grass prevention structure including a grass prevention sheet, which is constructed in a grass protection area on a road shoulder surface adjacent to a pavement surface. In the present specification, an area requiring grass protection is referred to as a “weedproof area”.

An upper surface schematic diagram and a cross-sectional schematic diagram of an example of the weedproof structure of the present invention are shown in FIG.
In the weedproof structure of the present invention, the first end portion of the weedproof sheet A is disposed so as to overlap the end portion of the pavement surface by about 100 mm, and about 100 mm of the first end portion of the weedproof sheet A is heat-sealed. Or fix to the edge of the pavement surface by tape bonding. Furthermore, the 1st end part of the weed prevention sheet A is fixed to a pavement surface edge part with a 1st nail-like instrument. As the first nail-like instrument, a concrete nail having a length of 40 mm to 60 mm can be used. Further, it is more preferable to drive concrete nails through a synthetic resin disk.

Next, the 2nd end part on the opposite side to the 1st end part of the weed prevention sheet A is fixed to the ground or a slope with a 2nd nail-like instrument. If the ground or slope to fix the second end is concrete, after applying a primer on the concrete top surface, lay the second end of the weedproof sheet A and use the second nail-like instrument to Or it is preferable to fix to a slope. After fixing the second end of the weedproof sheet A to the ground or slope with a second nail-like instrument, the boundary between the second end and the ground or slope is sealed using an asphalt sealant or the like. It is preferable to do.
The overlapping portion (end wrap) between the weedproof sheet A and the weedproof sheet A is integrated by heat fusion or tape adhesion.

  FIG. 2 shows a schematic top view and a cross-sectional schematic diagram of an example of the weedproof structure of the present invention, which is different from FIG. The example of FIG. 2 is preferably applied when the width of the road shoulder surface is wide. In addition, it can be efficiently applied by applying to the case where it is preferable to separate the integration work between the paved surface edge and the weed protection sheet and the integration work between the ground or slope and the weed protection sheet. With this, reliable construction can be performed.

First, the first end of the weedproof sheet A is arranged so as to overlap with the end of the pavement surface by about 100 mm, and the end of the pavement surface by about 100 mm of the first end of the weedproof sheet A is formed by heat fusion or tape bonding. Secure to the part. Furthermore, the 1st end part of the weed prevention sheet A is fixed to a pavement surface edge part with a 1st nail-like instrument. As the first nail-like instrument, a concrete nail having a length of 40 mm to 60 mm can be used. Further, it is more preferable to drive concrete nails through a synthetic resin disk.

Next, the second end of the weedproof sheet A opposite to the first end is overlapped with the second end of the weedproof sheet B opposite to the first end by 50 to 200 mm. The sheet B is arranged, and the first end portion of the weedproof sheet B is fixed to the ground or the slope with the second nail-like instrument.
The overlapping portion (end wrap) between the weedproof sheet A and the weedproof sheet A and the overlapping portion (end wrap) between the weedproof sheet B and the weedproof sheet B are integrated by heat fusion or tape bonding, respectively. To do.

And the overlap part of the 2nd end part of the weed prevention sheet A and the 2nd end part of the weed prevention sheet B is integrated by heat fusion or tape adhesion, and especially with the weed prevention sheet A and the weed prevention sheet A. The overlapping part (end wrap) and the overlapping part (end wrap) between the weedproof sheet B and the weedproof sheet B (the part where the four weedproof sheets overlap) are integrated by heat fusion or tape bonding. After that, it is preferable to place and fix an L-shaped pin having a length of 150 to 300 mm.

In the present invention, using a predetermined nail-like device and using a nail-like device at a predetermined interval, the grass-proof sheet is fixed to the edge of the pavement surface, or to the ground or the slope, thereby preventing the grass (growth of grass). Can prevent grass growth over the entire area where it is necessary.
The nail-like instruments (first nail-like instrument and second nail-like instrument) are preferably 0.1-1 m apart, more preferably 0.2-0.8 m apart, particularly preferably 0.3-0. It is preferable to drive at an interval of 6 m because the weedproof sheet can be fixed economically and reliably.

The material of the needle-shaped instrument used in the present invention is preferably a metal or a synthetic resin, and iron, stainless steel, a material plated with iron, a synthetic resin excellent in weather resistance, or a weather resistant coating on the synthetic resin. Can be used. The method for producing the needle-shaped instrument is not particularly limited. When the needle-shaped instrument is L-shaped, the needle-shaped instrument may be fabricated by bending a rod-shaped metal into a predetermined shape. They may be produced separately and connected by welding. In the case of a needle-shaped instrument made of synthetic resin, it may be manufactured by integral molding. When the needle-shaped instrument is L-shaped, the long nail portion and the short bar portion are separately manufactured and welded. You may connect by.

  The dimensions of the needle-like instrument can be appropriately selected depending on the thickness and strength of the weedproof sheet and the state of the weedproof section. Specifically, the length of the needle-like instrument is preferably 50 to 250 mm.

  As shown in FIGS. 1 and 2, the weedproof structure of the present invention includes a weedproof sheet A and / or a weedproof sheet B. Moreover, the weedproof structure of the present invention includes a weedproof section that is an area that prevents grass growth, an end of a pavement that is located in contact with one end of the weedproof section, and a ground or slope. Installed.

  The heat-sealing method of the present invention is a fixing method in which heat-sealing is performed by melting and then solidifying the modified asphalt constituting the herbicidal sheet by heating the end of the herbicidal sheet with a burner or the like. It is.

  In the tape bonding method of the present invention, an asphalt tape having adhesiveness on both sides is inserted between the edge of a weedproof sheet and the edge of a pavement, the ground or slope, or the edge of another grassproof sheet. And fixing.

In general, the typical road shoulder surface adjacent to the pavement surface is the road shoulder surface, but there are cases where the work of cutting the grown grass is not carried out by blocking traffic, so that workers are involved in traffic accidents, etc. It is a work that involves the dangers. In the case of the weedproof structure of the present invention, since the fixing of the weedproof sheet and the end of the pavement is reliable, it is difficult for the weedproof sheet to peel off from the end of the pavement, and new grass grows after the weedproof treatment. The effect that can be prevented is very high, and the installation of the grass protection structure of the present invention is preferable from the viewpoint of traffic safety because the frequency of cutting the grass grown after the grass protection treatment using the grass protection sheet can be extremely reduced. .
The “shoulder surface” means a peripheral portion such as a road, a track, and a promenade. Moreover, even when the road shoulder surface on which the weedproof structure of the present invention is installed is a promenade road shoulder surface, an excellent effect is achieved in that the maintenance frequency can be greatly reduced.

  As the herbicidal sheet (the herbicidal sheet A, the herbicidal sheet B) included in the herbicidal structure of the present invention, a sheet having flexibility, waterproofness and light-shielding property, and having a sheet shape may be used. it can. JP-A-2002-272348 (Patent Document 1), which has excellent flexibility, waterproofness and light-shielding property, as a specific example of the weedproof sheet (weedproof sheet A, weedproof sheet B) used in the present invention. The disclosed herbicidal sheet can be used.

  Moreover, it is especially preferable to use the penetration-proof type weed-proof sheet mentioned later as the weed-proof sheet (weed-proof sheet A, the weed-proof sheet B) contained in the weed-proof structure of this invention.

  The dimensions of the weedproof sheet can be appropriately selected depending on the dimensions of the weedproof area and other construction conditions. For example, in the example shown in FIG. 1 and FIG. 2, a plurality of weedproof sheets are connected at a weedproof sheet overlapping fusion part. In this way, the herbicidal sheet superimposing and fusing part of a plurality of herbicidal sheets having dimensions appropriately selected is used by bonding them together by a heat fusing method or a tape bonding method. It can be installed in a size grass protection area.

  The end portion in the lateral direction of the weed prevention area can be surely prevented by performing a termination process such as a fusion process to concrete or the like and a fixing process using a pin.

  The weedproof structure of the present invention can be used in any place as long as it is a road, railroad, river, park or afforestation, and the surrounding ground, surface, road shoulder, and the like. As described above, the weedproof structure of the present invention is particularly preferably installed on the “road shoulder surface”.

  Next, the grass protection sheet (weedproof sheet A, grass protection sheet B) that is particularly preferably used for the grass protection 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 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.

  The penetration-proof weedproof 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 is 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 comprising 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.

  With a penetration-proof weedproof sheet, it has a light-shielding property to prevent the growth of grass on the ground, surface, especially the road shoulder surface of roads, railways, rivers, parks or afforestation areas, etc., weather resistance, A herbicidal sheet excellent in mechanical properties and water impermeability, and also excellent in preventing penetration of hard and sharp weed buds against the herbicidal sheet can be obtained.

  In FIG. 3, typical sectional drawing of a penetration-proof type weedproof sheet is shown. The penetration-proof grass protection sheet includes (a) a surface layer 1 including 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 back layer 5 which is the layer 4 and (e) synthetic resin or a synthetic resin containing inorganic particles are laminated in this order. Penetration-proof grass protection sheet has light-shielding and weather resistance to prevent grass growth on the ground, surface, especially road shoulder, such as roads, railways, rivers, parks or afforestation gardens and their surroundings. It is excellent in mechanical properties and water impermeability, 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) The base material layer includes a base material A that is at least one selected from the group consisting of a woven fabric, a knitted fabric, and a non-woven fabric, and a base material B having a scrim.

The woven fabric, knitted fabric and non-woven fabric constituting the substrate A include fibers having a core-sheath structure having a core portion and a sheath portion. In this 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 composed of fibers 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, more preferably 400 ° C. or less, from the viewpoint of ease of production and cost.

  (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 to use low water-absorbing nylon 11 or nylon 12, synthetic resin such as polyester or glass, or fibers made of inorganic substances from the viewpoint of water absorption and mechanical strength.

  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. Resins such as polyester imide, polyimide, polysulfone, and polyether can be used. In particular, nylon 11 and nylon 12 having low water absorption 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. Obtainable.

  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, (i) part of the core-sheath fiber is made of a resin having a melting point of 200 ° C. or higher. Adhered woven fabric, knitted fabric, non-woven fabric, etc. (ii) Partially woven fabric, knitted fabric, non-woven fabric bonded by 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 in which is thermally fused. The upper limit of the melting point of the resin and the thermal decomposition temperature of the adhesive 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.

  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 substrate A, the resin having a melting point of 200 ° C. or higher is a natural material having a melting point of 200 ° C. or higher. Any synthetic resin can be used as long as it is a resin such as polyamide, polycarbonate, polyphenylene oxide, polyethersulfone, polyamideimide, polyesterimide, polyimide, polysulfone, or polyether having a melting point of 200 ° C. or higher. Can be used. In particular, nylon 11 or 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, Polychloroprene adhesives, nitrile rubber adhesives, recycled rubber adhesives, SBR adhesives, natural rubber adhesives, 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.

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 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 a 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 fibers having a melting point of 200 ° C. or higher, those 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 comprising 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 the above fibers, (ii) woven fabric, knitted fabric, non-woven fabric, etc., part of which is bonded with a resin having a melting point of 200 ° C. or higher, etc. 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. The upper limit of the melting point of the resin and the thermal decomposition temperature of the adhesive 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.

  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 substrate A, the resin having a melting point of 200 ° C. or higher is a natural material having a melting point of 200 ° C. or higher. Any synthetic resin can be used as long as it is a resin such as polyamide, polycarbonate, polyphenylene oxide, polyethersulfone, polyamideimide, polyesterimide, polyimide, polysulfone, or polyether having a melting point of 200 ° C. or higher. Can be used. In particular, nylon 11 or 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, Polychloroprene adhesives, nitrile rubber adhesives, recycled rubber adhesives, SBR adhesives, natural rubber adhesives, 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.

  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. A scrim means a plain woven or twill woven fabric. That is, the scrim has a shape in which two or more sets each having a plurality of parallel fibers and / or threads that are substantially parallel to each other are formed, and different sets of fibers and / or threads cross each other at substantially equal angles. It is. As an example, a scrim having a shape in which two sets of a plurality of parallel and approximately equally spaced fibers and / or yarns intersect each other substantially at right angles can be used. 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. The upper limit of the fiber and / or yarn spacing is preferably a scrim of 30 mm or less, more preferably 20 mm or less, more preferably 18 mm or less, from the viewpoint of required mechanical strength.

  Further, the fibers and / or yarns constituting the scrim preferably have a melting point of 200 ° C. or higher. 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) 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 sheet end 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. Alternatively, it is preferable that at least a part of the contact portion between the base material A and the base material B is heat-sealed at a temperature of 200 ° C. or higher. 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 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 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 below the lower limit value, it becomes difficult to obtain a preferable tensile strength or tear strength, and when the upper limit value is exceeded, the strength characteristics of the penetration-proof weedproof sheet are further improved. Is unfavorable because it increases and the workability of laying decreases.

  (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. Also, 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, so it is littered as seen in the type of weed-proof sheet colored on the nonwoven fabric. Serious damage such as piercing by cigarettes can be prevented.

  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, 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 part 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. A range of 0.5 to 0.8 can be preferably 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 particularly preferably in the range of 0.02 to 0.1. A thing can be used conveniently.

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

  As the inorganic particles, water repellents, paints, pigments, thickeners, light proofing agents, weathering agents and the like may be added, sprayed, applied, or impregnated as necessary.

  (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, or impregnation on the (b) modified asphalt layer. 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. It is preferable to add a water repellent, a pigment, a thickener, a light fastener, a weatherproof agent and the like to the synthetic resin containing inorganic particles 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 , particularly preferably in the range of 400 to 1200 g / m ² .

  (A) As a synthetic resin for 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 polyester imide, polyamide, acrylic resin, polybutadiene, styrene-butadiene copolymer, vinyl polymer and olefin having two or more double bonds in the main chain and main chain A copolymer with an olefin having one double bond can 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. It is preferable to use a synthetic resin having excellent flexibility.

  (A) In the surface layer, as the synthetic resin paint, polyurethane, acrylic resin, ethylene-vinyl acetate copolymer, polyester, polyamide, polyimide, polybutadiene, styrene-butadiene copolymer, or the like can be used. 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. Preferred is a polymer or a copolymer of at least one monomer and an α-olefin such as ethylene or another vinyl monomer such as styrene.

  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 heat mixing at 120 to 200 ° C. for 3 to 30 hours, including 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, 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, polymer of styrene and butadiene (for example, SBS, SBR etc.) 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 Particulate inorganic fillers such as barium, diatomaceous earth, and silica, and fibrous inorganic fillers such as asbestos and glass fibers 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 placed on the road shoulder surface, the upper portion of the road shoulder surface has excellent water impermeability. In addition to being able to form a layer and blocking moisture essential for the growth of weeds, if the road shoulder surface is constructed of embankment, the road shoulder due to the infiltration of rainwater from the upper part of the shoulder surface (the shoulder) By effectively preventing water on the surface itself, it is possible to avoid the collapse of the road shoulder ground due to heavy rain.

  The penetration-proof grass protection sheet includes (e) a back surface layer containing a synthetic resin or a synthetic resin containing 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) The back layer used for the penetration-proof grass protection sheet is preferably a hard synthetic resin film having a thickness of preferably 10 to 50 μm, more preferably 12 to 40 μm, and particularly preferably 15 to 30 μm. Can be used for (E) When the hard synthetic resin film as the back surface layer is thicker than the above range, the effect of preventing the penetration of chigaya buds through the penetration-resistant weedproof sheet is enhanced, but the flexibility of the penetration-resistant weedproof sheet May be damaged. For this reason, if a through-proof type weedproof sheet is manufactured and then packed into a roll, problems such as wrinkling on the sheet surface may occur, and workability during laying may be impaired in construction work. is there. Moreover, when the synthetic resin film of the (e) back surface layer is thinner than the said range, the effect which prevents a hard and sharp chigaya bud from penetrating a penetration-proof weedproof sheet becomes small. It is preferable that the hard synthetic resin film is within the above range because these problems do not occur.

  (E) Rubber can be added to the synthetic resin of the back layer. The rubber that can be added to the synthetic resin is a thermoplastic low crystalline elastomer that does not have a clear yield point, or a thermoplastic amorphous elastomer that does not have a clear melting point and yield point, and an elastomer that has rubber elasticity at room temperature. Can be used. Thermoplastic elastomers such as styrene elastomers, olefin elastomers, polyester elastomers and polyamide elastomers 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, such as coalescence (SEPS, etc.) Lock copolymer includes all such graft copolymer) and its hydrogenated product can be used.

  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) Specific examples of rubbers that can be added to the synthetic resin for the back layer include polybutadiene, styrene-butadiene copolymer, polyisobutylene, chloroprene rubber, and nitrile rubber.

  (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, Mica, barium sulfate, diatomaceous earth, silica and the like can be used.

  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 does not thermally decompose at 200 ° C. 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 containing 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.

  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 particularly 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, more preferably 200 N or more, and particularly preferably 250 N or more. A penetration resistance within the above range is preferable because growth of weeds 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, 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 particularly preferably 40% or more. “Tensile elongation” is a measured value based on JIS A6013. In the above range, it is suitable for unevenness of the ground due to moderate flexibility, so it is excellent in handling during 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, 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. Moreover, if the tear strength of the weedproof sheet is in the above range, even when the end portion of the weedproof sheet is fixed using a fixing pin, the durability of the fixed portion (location where stress is concentrated) is sufficiently secured. be able to.

  In the weedproof sheet used in the present invention, the total thickness of the five layers from (a) the front surface layer to (e) the back surface layer is preferably in the range of 1 mm to 10 mm, more preferably in the range of 1.5 mm to 8 mm, 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 of the longitudinal direction to 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, 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 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 penetration-proof type herbicide having a total thickness of 3 mm 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 surface layer 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 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 light from growing on the ground, the surface, especially the road shoulder, and the water-imperviousness, such as roads, railways, rivers, parks or afforestation gardens, and their surroundings. In addition, it is possible to prevent water on the shoulder surface due to concentrated heavy rain and the like, and in particular, it is possible to obtain a weedproof structure excellent in preventing penetration of hard and sharp weed buds against a herbicidal sheet.
<Reference Example>

  The penetration-resistant weedproof sheet will be described below with reference examples, but the penetration-resistant weedproof sheet used in the present invention is not limited at all by this.

<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. 6A and 6B, 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 through the weeded and fixed grass-proof sheet 8 as shown 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. 4, the result of having observed the penetration state of the bud of the chigaya of experiment 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.

<Reference Examples 1 to 5, Reference Comparative Examples 1 and 2>
According to the following procedures, a herbicidal sheet was produced under the conditions shown in Table 2. Reference Examples 1 to 5 correspond to penetration-proof grass protection sheets.

  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; varieties: SNS125 (three-layer structure of nonwoven fabric-scrim-nonwoven fabric), 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-two-layer structure of glass fiber bundle), 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-kind: SNS155 and the product name: colback-kind: SNS125 are non-woven fabric and glass fiber scrims made of fibers of a core-sheath structure (sheath: nylon, core: 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 chigaya bud in FIG. 5 is shown. In addition, “workability” in Table 3 is a comprehensive judgment of the ease of handling and easiness in the construction work of the herbicidal sheet, such as the weight, flexibility, and occurrence of wrinkles of the sheet.

  As is clear from these results, when biaxially stretched polypropylene, which is a kind of hard synthetic resin, is used as the back layer, the number of penetrations of chigaya buds is smaller than when high-density polyethylene is used. It was possible to obtain a higher herbicidal effect.

In addition, when biaxially stretched polypropylene is used and a composite nonwoven fabric with a basis weight of 155 g / m ² is used as the base material layer, no chigaya buds penetrate (Reference Example 4), or Even if the bud penetrated, the number of penetrations was very small (Reference Examples 2, 3, and 5), and the length of the penetrated eye was also 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 because of the fiber structure of the composite nonwoven fabric having 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 an upper surface schematic diagram which shows an example of the weed prevention structure of this invention. It is an upper surface schematic diagram which shows an example of the weed prevention structure of this invention. 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 layer 6: Measuring jig 7: Tip of measuring jig 8: Weed prevention sheet

Claims (6)

A method for constructing a weedproof structure including a weedproof sheet to be constructed in a grassproof area on the shoulder surface adjacent to the pavement surface,
The process of laying grass protection sheets in the grass protection area
Arranging the first end of the weedproof sheet A so as to overlap the paved surface end; and
Fixing the first end of the weedproof sheet A to the paved surface end by heat fusion or tape bonding;
Fixing the first end of the weedproof sheet A to the paved surface end by a first nail-like tool;
A method of constructing a weedproof structure comprising the step of fixing a second end of the weedproof sheet A opposite to the first end to the ground or a slope with a second nail-like instrument. . A method for constructing a weedproof structure including a weedproof sheet to be constructed in a grassproof area on the shoulder surface adjacent to the pavement surface,
The process of laying grass protection sheets in the grass protection area
Arranging the first end of the weedproof sheet A so as to overlap the paved surface end; and
Fixing the first end of the weedproof sheet A to the paved surface end by heat fusion or tape bonding;
Fixing the first end of the weedproof sheet A to the paved surface end by a first nail-like tool;
Laying the second end opposite to the first end of the weedproof sheet A so that the second end opposite to the first end of the weedproof sheet B overlaps;
Fixing the first end of the weedproof sheet B to the ground or the slope with a second nail-like instrument;
A step of integrating the overlapping portion of the second end portion of the weedproof sheet A and the second end portion of the weedproof sheet B by heat fusion or tape bonding. Construction method.   The herbicidal sheet A and / or the herbicidal sheet B has stretchability in at least a plane direction, and the tensile elongation of the herbicidal sheet A and / or the herbicidal sheet B is 20% or more. The construction method of the weed prevention structure of Claim 1 or Claim 2.   The construction method of the weedproof structure according to claim 1, wherein the weedproof sheet is a penetration-proof weedproof sheet.   The construction method of the weed prevention structure of any one of Claims 1-4 whose pavement surface is a pavement surface of an asphalt pavement road, and a grass prevention area is the road shoulder surface of an asphalt pavement road.   The weed prevention structure formed by the construction method of the weed prevention structure of any one of Claims 1-5.

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