JP4325742B1 - Weedproof structure including weedproof sheet and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the growth of a whole grass prevention area even in a grass protection area having a support rail to which attachments such as guardrails, road signs and signals are attached, particularly from a gap between the grass protection sheet and the pillar. A simple and low-cost construction method for preventing grass growth, and a grass prevention structure to be installed by the construction method are obtained.
A step of forming a main body cutting part between a main body opening and a point of the main body opening in the weedproof sheet main body and one point of an end of the weedproof sheet main body, and a patch cutting unit on the patch sheet A step of laying the grass protection sheet main body in the grass prevention area, and passing the patch cutting portion through the patch opening portion to penetrate the patch sheet, covering all the main body cutting portion and the main body cutting portion And a step of laying the patch sheet on the weedproof sheet main body so that the patch cutting part does not overlap with the patch cutting part.
[Selection] Figure 1

Description

  The present invention relates to a grass protection structure including a grass protection sheet and a construction method thereof, which are arranged in a place where grass growth needs to be prevented, particularly a place which already has a support.

  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, and especially slopes because of the loss of aesthetics. In particular, on the shoulders of roads and the slopes adjacent to them, the growth of weeds not only impairs the aesthetics but also may 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). .
JP 2002-272348 A JP 2005-307518 A JP 2006-177122 A

  In general, when there is only a support in a place (weedproof area) where a grassproof structure is installed to prevent grass growth, as shown in FIGS. 10 and 11, an opening is provided in the grassproof sheet. It can be laid down on the support. However, there may already be posts with guardrails, road signs, signals, etc. in the grass protection area. When the weedproof structure is installed in such a place, since the guard rail and the sign are attached to the support, it is not possible to adopt a laying method in which an opening is provided on the support and covered with the support. For this reason, it is difficult to lay a weedproof sheet around the support without gaps. As a result, when a grass-proof structure is installed in a grass-proof area where guard rails, road signs, signals, etc. already exist, a gap is created between the grass-proof sheet and the pole, and grass grows from the gap. There is a problem.

  Therefore, the present invention prevents grass growth over the entire grass protection area even in a grass protection area having guard rails, road signs, signals, and other attachments, and in particular, a grass protection sheet and a support column. The purpose of the present invention is to obtain a simple and low-cost construction method of a herbicidal structure for preventing the growth of grass from the gaps and a herbicidal structure to be installed by the construction method.

  The present invention is a construction method for installing a grass protection structure including a grass protection sheet body and a patch sheet in a grass protection area having a support column to which an attachment is attached. A step of forming a main body opening at one position of the main body opening and the main body opening at one position of the end of the weedproof sheet main body at the position of the weedproof sheet main body corresponding to the position, and the patch sheet A step of forming a patch cutting portion between one point of the opening and the patch opening and one point of the end of the patch sheet, and passing the main body cutting portion through the main body opening, the column is attached to the weedproof sheet main body. Penetration of the weed prevention sheet main body in the grass prevention area, and passing the patch cutting part through the patch opening part to penetrate the patch sheet, covering all the main body cutting part and cutting the main body cutting part and the patch The part is heavy As no al, and a step of laying a patch sheet onto the weed seat body, a method of constructing the weed structure.

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 shape of the patch opening before penetrating the strut is similar to the cross-sectional shape of the strut and smaller than the cross-sectional shape of the strut.
(2) The ratio Dh / Dp between the longest dimension Dh of the shape of the patch opening before penetrating through and the longest dimension Dp of the cross-sectional shape of the pillar is 0.5 or more and less than 1.
(3) The patch sheet has extensibility at least in the plane direction, and the tensile elongation of the patch sheet is 20% or more.
(4) The weedproof sheet body and / or the patch sheet is a modified asphalt type weedproof sheet.
(5) The shape of the opening of the main body before penetrating the column is similar to the shape of the cross section of the column and is 1 to 20 mm larger than the longest dimension of the shape of the column of the column.
(6) The main body cutting portion is formed so that the distance between one point of the main body opening and one point of the end portion of the weedproof sheet main body is the shortest distance.
(7) The shape of the patch sheet is square or rectangular, and the length of one side of the square or rectangular is 100 to 400 mm longer than the longest dimension Dp of the cross-sectional shape of the support column.
(8) The shape of the main body cutting portion and the patch cutting portion is linear, and in the step of laying the patch sheet, the angle of the main body cutting portion and the patch cutting portion centered on the column center position is 90 to 270 degrees. Lay the patch sheet as there is.
(9) The method further includes a step of filling a silicon-based sealant between the main body opening and the column and / or between the patch opening and the column.
(10) The grass protection area is a grass protection area adjacent to the pavement surface, and the step of laying the grass protection sheet main body in the grass protection area includes the first end of the grass protection sheet main body at the end of the pavement surface. The step of arranging the weed sheet main body, the step of fixing the first end portion of the weedproof sheet main body to the paved surface end portion by heat fusion or tape bonding, and the first end portion of the weedproof sheet main body further Fixing to the end of the pavement surface with the nail-shaped tool of the step, and fixing the second end opposite to the first end of the weedproof sheet body to the ground with the second nail-shaped tool. .
(11) The paved surface is a paved surface of an asphalt paved road, and the grass protection area is a slope of the asphalt paved road.
(12) The attachment is a guard rail.

  Moreover, this invention is a weed prevention structure constructed | assembled by said construction method.

  According to the present invention, even in a grass prevention area having a support column to which attachments such as guardrails, road signs and signals are attached, grass growth is prevented over the entire grass prevention area, It is possible to obtain a herbicidal structure that is installed by a simple and low-cost construction method and a construction method for preventing grass growth from the gap.

  The weedproof structure of the present invention is easy to construct a weedproof structure for a weedproof area having a post to which guardrails, road signs, signals, etc. are attached, and has a high herbicidal effect. It has the characteristic of being obtained. In this specification, a guardrail, a road sign, a signal, and the like attached to a support column are referred to as an “attachment”. In addition, the area where the weedproof structure is installed is referred to as “weedproof area”.

  FIG. 1 is a schematic top view of a weedproof structure of the present invention, and FIG. 8 is a schematic cross-sectional view including a support 23. A guard rail 24 is attached to the column 23 shown in FIGS. 1 and 8. The grass protection structure of the present invention uses the predetermined grass protection sheet body 10 and the predetermined patch sheet 40 to prevent grass growth over the entire area (the grass protection area) where the grass protection structure of the present invention is installed. can do. In particular, in the case where the grass protection area has a support post 23 to which a guardrail, a road sign, a signal or the like (attachment) is already attached, when the grass prevention structure of the present invention is installed, the support 23, the grass prevention sheet main body 10 and the patch are installed. A gap with the sheet 40 can be eliminated. Therefore, by using the weedproof structure of the present invention, it is possible to prevent grass growth from the gap between the support 23, the weedproof sheet body 10 and the patch sheet 40 by a simple and low cost construction method. it can.

<Weedproof structure>
In FIG. 2, the cross-sectional schematic diagram of a suitable place for installing the weed prevention structure of this invention is shown. The grass prevention area shown in FIG. 2 has a column 23 to which a guardrail 24 is attached. 1 and 8 show an example in which the weedproof structure of the present invention is installed in a place as shown in FIG. FIG. 1 is a schematic top view of the weedproof structure of the present invention, and FIG. 8 is a schematic cross-sectional view thereof. In these drawings, an example is shown in which the weedproof structure of the present invention is arranged in a weedproof area on a slope 30 of an asphalt paved road. “Slope” means roads and tracks and their surrounding slopes, slopes made of cuts, embankments, slopes between two stepped ground surfaces, slopes between two ground surfaces and two grounds It means between the surfaces. As shown in FIGS. 1 and 8, the weedproof structure of the present invention includes a predetermined weedproof sheet body 10 and a predetermined patch sheet 40, through which a support 23 penetrates. As will be described later, when the grass protection structure of the present invention is installed, the column 23 can be easily passed through the predetermined grass protection sheet main body 10 and the predetermined patch sheet 40.

<Weedproof sheet body>
In FIG. 3, an example of the predetermined weedproof sheet main body 10 is shown. The weedproof sheet main body 10 is formed with a main body opening 11 for allowing the support 23 to pass through at the position of the weedproof sheet main body 10 corresponding to the position of the support. “Position corresponding to the column position” means that when the grass protection sheet main body 10 is laid at a predetermined location in a certain grass prevention area, the grass protection sheet main body 10 and the columns 23 arranged in the grass protection area are It is the overlapping position.

  The weedproof sheet main body 10 has a main body cutting part 43 which is a part cut between the main body opening 11 and one end of the weedproof sheet main body 10. Since the weedproof sheet main body 10 has the main body cutting part 43, when the weedproof sheet main body 10 is laid, by passing the support 23 through the main body cutting part 43, as shown in FIG. 5 and FIG. Is easy to pass through the body opening 11. Therefore, even when an attachment such as a guard rail is attached to the support post 23, the weedproof sheet body 10 can be easily laid.

  In the drawing, the column 23 is a cylinder and the cross-sectional shape thereof is circular. However, the column 23 has a cross-sectional shape other than a circle, for example, a polygon such as a triangle or a rectangle, an ellipse, or the like. , Can be any shape. The shape of the body opening 11 of the weedproof sheet body 10 used in the weedproof structure of the present invention is preferably similar to the shape of the cross section of the column 23.

  The grass protection structure shown in FIG. 1 illustrates the case where one grass protection sheet main body 10 has one main body opening 11, but one grass protection sheet main body 10 includes two or more support columns 23. Two or more body openings 11 can be provided for penetration. In such a case, it is difficult to accurately form the plurality of main body openings 11 at the position of the weedproof sheet main body 10 corresponding to the plurality of column positions. Therefore, the main body opening 11 is preferably 1 to 20 mm larger than the longest dimension of the cross-sectional shape of the column 23. The “longest dimension of the shape” refers to the longest length of straight lines connecting two arbitrary points of the shape. For example, when the cross-sectional shape of the column 23 is a circle, the longest dimension of the column 23 is the diameter of the circle. Moreover, when the shape of the support | pillar 23 is a rectangle, the longest dimension is the length of a diagonal line.

  From the viewpoint of more reliably preventing grass growth, it is preferable to shorten the main body cutting portion 43 of the weedproof sheet main body 10 as much as possible. Therefore, as shown in the example of FIG. 3, in the weedproof sheet main body 10, the distance between the main body cutting portion 43 and one point of the main body opening 11 and one end of the weedproof sheet main body 10 is the shortest distance. It is preferable to form such that

<Patch sheet>
The herbicidal structure of the present invention includes a patch sheet 40. An example of the patch sheet 40 is shown in FIG. The patch sheet 40 has a patch opening 42 and a patch cutting part 44. The patch sheet 40 is laid on the weedproof sheet body 10. The patch opening 42 is an opening for allowing the patch sheet 40 to penetrate the support post 23.

  The patch sheet 40 includes a patch cutting portion 44 that is a portion obtained by cutting between the patch opening 42 and one point at the end of the patch sheet 40. When the patch sheet 40 is laid on the weedproof sheet main body 10, the strut 23 passes through the patch opening 42 as shown in FIGS. 7 and 8 by passing the strut 23 through the patch cutting portion 44. Can be. Therefore, even when an attachment such as a guard rail is attached to the column 23, the patch sheet 40 can be easily laid.

  When laying the patch sheet 40 on the weedproof sheet main body 10, the patch sheet 40 is laid so as to cover the main body cutting part 43 of the weedproof sheet main body 10. At this time, the patch sheet 40 is laid so that the main body cutting part 43 and the patch cutting part 44 do not overlap. By laying the patch sheet 40 on the weedproof sheet main body 10 in this way, the entire main body cutting portion 43 is covered with a portion other than the patch cutting portion 44 of the patch sheet 40. Grass growth from the main body cutting part 43 can be prevented.

  The weedproof sheet body 10 and the patch sheet 40 laid on the weedproof sheet body 10 are preferably fixed by a heat-sealing method. In the heat fusion method, when a part where two objects contact is fixed, at least one of the two objects is heated by a burner or the like to be melted and solidified. It is a fixing method. Specifically, the surface of the weedproof sheet main body 10 and the back surface of the patch sheet 40 can be fixed by heating and melting with a burner or the like and solidifying. When fixing is performed by the heat fusion method, as shown in an enlarged view of the vicinity of the support 23 of the herbicidal structure in FIG. 16, the end portion of the patch sheet 40 is heated and fused to the surface of the support 23 (heat fusion). By forming the landing portion 45), the weedproof effect of the gap between the weedproof sheet 10 and the support post 23 can be further enhanced. In some cases, inorganic particles or the like are arranged on the surface of the herbicidal sheet main body 10 or the patch sheet 40. However, when fixing by the heat fusion method, these inorganic particles may be fixed after being removed. It may be fixed without removing.

  The weedproof sheet body 10 and the patch sheet 40 laid on the weedproof sheet body 10 can be fixed by a tape bonding method. In the tape bonding method, an adhesive tape such as asphalt tape that adheres to both sides is inserted into at least a part between the parts that come into contact with each other when fixing the part that comes into contact with two objects. This is a method of fixing two objects. Adhesive strength equal to that of the heat-sealing method is obtained with the tape bonding method, and the use of fire is restricted when installed near residential areas or when there are many flammable materials such as undergrass near the installation location. In some cases, it is preferable to use a tape bonding method.

  The patch sheet 40 needs to have a shape having a size sufficient to cover the main body cutting portion 43 when laid. The patch sheet 40 may be circular, oval, square or rectangular, and is preferably square or rectangular. The length of one side of the square or rectangular patch sheet 40 is preferably 100 to 400 mm longer than the longest dimension Dp of the cross-sectional shape of the column 23.

  From the viewpoint of minimizing the length of the cutting part, it is preferable that the main body cutting part 43 of the weedproof sheet main body 10 and the patch cutting part 44 of the patch sheet 40 are both linearly cut. Further, from the viewpoint of ensuring the prevention of grass growth, the angle (angle θ shown in FIG. 9) around the column center position of the main body cutting part 43 and the patch cutting part 44 is 90 to 270 degrees. Thus, it is preferable to lay the patch sheet 40 on the weedproof sheet body 10.

  The patch sheet 40 preferably has extensibility at least in the plane direction. When the patch sheet 40 has extensibility, the size of the patch opening 42 of the patch sheet 40 can be made smaller than the shape of the cross section of the column 23. “Having extensibility” refers to a property that, when a force is applied in a certain direction, can exhibit elastic elongation in that direction. When the patch sheet 40 is stretchable, the patch opening 42 can be widened when the support 23 is passed through the patch opening 42, and after the support 23 penetrates the patch opening 42, the support 23 and the patch opening are opened. A gap between the portion 42 can be eliminated. Therefore, even if caulking material is not packed between the support column 23 and the patch opening 42, it is possible to prevent grass growth from the gap. However, a caulking material such as a silicon-based sealing material can be disposed between the support post 23 and the patch opening 42 in order to make the grass prevention more reliable.

  The shape of the patch opening 42 of the patch sheet 40 is preferably similar to the shape of the cross section of the column 23, as in the case of the main body opening 11. The ratio Dh / Dp between the longest dimension Dh of the shape of the patch opening 42 before the column 23 penetrates and the longest dimension Dp of the cross-sectional shape of the column 23 is preferably 0.5 to less than 1, more preferably 0.7 to 0.99, more preferably 0.8 to 0.97, particularly preferably 0.9 to 0.95. It is preferable.

  In addition, from the viewpoint of more reliably preventing grass, the tensile elongation of the patch sheet 40 is preferably 20% or more, more preferably 30% or more, more preferably 40% or more, and particularly preferably 50% or more. It is preferable. By using the patch sheet 40 having the above-described tensile elongation rate, it is possible to obtain good herbicidal sheet workability and excellent herbicidal properties. The “tensile elongation” is a measured value based on JIS A6013.

<Aspects of the herbicidal structure>
When the grass protection structure of the present invention is installed in a grass protection area adjacent to a pavement surface 21 such as a road slope 30, one end (first end portion 12) of the grass protection sheet body 10 is a road pavement surface. The other end (second end portion 13) opposite to the first end portion 12 is fixed to the slope 22. The portion where the first end portion 12 of the weedproof sheet main body 10 and the paved surface end portion 22 are in contact is fixed by a heat fusion method or a tape bonding method. Furthermore, fixing is ensured by fixing the first end portion 12 of the weedproof sheet main body 10 to the paved surface end portion 22 by using the first nail-like instrument 14. Further, the second end portion 13 of the weedproof sheet main body 10 is fixed to the ground by the second nail-like instrument 15. The “first end portion 12” and the “second end portion 13” are regions in the vicinity of a predetermined end of the weedproof sheet body 10, and are necessary for fixing the weedproof sheet body 10 by a predetermined method. An area having dimensions.

  The end portion of the weedproof sheet main body 10 and the pavement surface 21 can be fixed by a heat-sealing method. Specifically, the end of the weedproof sheet main body 10 is heated by a burner or the like, and the modified asphalt constituting the weedproof sheet main body 10 is melted and solidified to fix the end to the pavement surface 21 or the like. .

  Moreover, the edge part of the weed prevention sheet main body 10, and the pavement surface 21 grade | etc., Can be fixed by the tape bonding method. Specifically, asphalt tape having adhesiveness on both sides can be inserted between the end portion of the weedproof sheet main body 10 and the pavement surface 21 or the like, and the end portion and the pavement surface 21 or the like can be fixed.

  From the viewpoint of securing the end portion of the weedproof sheet main body 10 and the pavement surface 21 and the like more securely, it is preferable to use a heat fusion method. Further, when the use of fire is restricted, it is preferable to use a tape bonding method.

  As the first nail-like instrument 14 for fixing the first end portion 12 of the weedproof sheet main body 10 to the paved surface end portion 22, an all anchor, a concrete nail, a surveying nail, or the like can be used. The all anchor is an anchor in which an anchor body, a driving pin, a nut and a washer are set. As an example of the all anchor, one having a diameter of 5 mm and a length of 30 mm can be used. Further, in order to ensure fixing by the all anchor, an all anchor disk (for example, a thickness of 1.2 mm and a diameter of 45 mm) can be used. Moreover, it is preferable to use an automatic nailing machine in order to efficiently and reliably fix the concrete nails.

  Specifically, an L-shaped pin can be used as the second nail-like instrument 15 for fixing the second end portion 13 of the weedproof sheet body 10 to the slope 30. 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 500 to 800 mm can be used.

  14 and 15 are schematic cross-sectional views in the vicinity of the slope 30 of one mode for fixing the second end portion 13 of the weedproof sheet 10 to the slope 30. FIG. In the case of this aspect, as shown in FIG. 14, a slope digging portion 31 is provided on the slope 30, and the grass protection sheet 10 is fixed to the slope digging portion 31 using the second nail-like instrument 15. Next, as shown in FIG. 15, the second end portion 13 is embedded in the slope 30 by refilling the slope excavation portion 31, thereby securing the second end portion 13. Since the second end portion 13 of the weedproof sheet 10 is embedded in the slope burying portion 32, it is possible to prevent the second end portion 13 of the weedproof sheet 10 from dripping due to a storm or the like.

  Further, as shown in FIG. 1, when the reinforcing bar 16 is arranged and the reinforcing bar 16 is fixed by the second nail-like instrument 15, the second end 13 of the weedproof sheet main body 10 is not embedded and the weedproof sheet main body is embedded. The fixing to the 10 slopes 30 can be ensured. It is preferable to use a reinforcing bar 16 that is not affected by chemicals such as a snow melting agent in a cold district or the like where a snow melting agent or the like is used for road management. Specifically, the reinforcing bar 16 is preferably a steel wire having a diameter of about 6 mm subjected to zinc plating or zinc alloy plating including aluminum.

  Further, as another mode for fixing the second end portion 13 of the weedproof sheet 10 to the slope 30, a mesh-like presser 27 can be used. Specifically, as the mesh-like presser 27, a belt-like mesh-like material such as a metal mesh or a synthetic resin mesh can be used. Specific examples of fixing the grass prevention sheet 10 to the slope 30 using the mesh-shaped presser 27 are shown in FIG. 12 (planar schematic diagram) and FIG. 13 (cross-sectional schematic diagram). The width | variety of the mesh-shaped pressing tool 27 is about 0.3-2m, and it is preferable that it is 0.5-1m. As shown in FIG. 12 and FIG. 13, a mesh-like presser 27 is laid so as to straddle the second end portion 13 of the weedproof sheet 10 and a part of the slope 30. Both the portion laid on the grass prevention sheet 10 and the portion laid on the slope 30 of the mesh-shaped presser 27 are fixed to the slope 30 by the second nail-shaped instrument 15, thereby providing the grass prevention sheet. The fixing to the 10 slopes 30 can be ensured. Thus, in the case of the fixing method using the mesh-shaped presser 27, 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.

  Further, in order to further secure the herbicidal sheet 10 to the slope 30, the above-described reinforcing bar 16 is further arranged on the mesh-like presser 27, and the mesh-like presser is used using the second nail-like tool 15. It is preferable to fix the tool 27 and the reinforcing bar 16.

  The dimension of the weedproof sheet body 10 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, a plurality of weedproof sheet main bodies 10 are connected by a weedproof sheet main body overlapping fusion portion 17. Thus, the weedproof structure of the present invention can be obtained by using the herbicidal sheet body overlapping fused portions 17 of the plurality of appropriately selected dimensions of the weedproof sheet body 10 by the heat fusion method or the tape bonding method. The body can be placed in any size grass protection area.

  When the width of the grass protection area is narrower than that of the grass protection sheet body 10, that is, when the width of the grass protection area is generally about 1 m or less, a single tape-shaped grass protection sheet is used as the grass protection sheet body 10. Can be installed. A plurality of main body openings 11 are formed in the tape-shaped weed-proof sheet main body 10 at predetermined positions corresponding to the intervals between the columns 23. The tape-shaped weed-proof sheet main body 10 having a plurality of main body openings 11 can be laid so that the columns 23 penetrate the main body openings 11. The size of the main body opening 11 of the weedproof sheet main body 10 is larger than the cross-sectional size of the support post 23, thereby aligning the plurality of main body opening portions 11 of the weedproof sheet main body 10 with the corresponding plurality of support posts 23. Becomes easier. However, in order to further facilitate the alignment between the position of the column 23 and the main body opening 11, the dimensions of the weedproof sheet main body 10 so that each of the weedproof sheet main bodies 10 has one main body opening 11. Is preferably selected. A patch sheet 40 is laid on the weedproof sheet body 10 around each column 23.

  The lateral ends 18 and 19 of the weed protection area (shown in FIGS. 1 and 12 as having a lateral end 18 at the top and a lateral end 19 at the bottom of the figure) The body 10 is subjected to termination treatment such as fusion treatment (concrete end portion 18) to concrete or the like and fixing treatment using a pin (lateral end portion 19), so that weed prevention can be ensured.

  The grass protection structure of the present invention should be used in any place where grass protection is required, such as roads, railways, rivers, parks, or afforestation gardens, and the surrounding ground, surfaces, and slopes. Can do. In particular, when the grass protection structure of the present invention is installed in a grass protection area where the grass protection area is adjacent to the pavement surface 21, it is possible to achieve a better grass protection effect. Further, the grass protection structure of the present invention has a further excellent herbicidal effect when the pavement surface 21 is the pavement surface 21 of the asphalt pavement and the grass prevention area is the slope 30 of the asphalt pavement. Can play.

<Construction method of weedproof structure>
Next, the construction method of the weedproof structure of this invention is demonstrated.

  The weedproof structure of the present invention is applied to a weedproof area having a column 23 to which an attachment is attached. The construction method of the weedproof structure of this invention forms the main-body opening part 11 in the position of the weed-proof sheet main body 10 in the position of the weedproof sheet main body 10 corresponding to a support | pillar position. A step of forming a main body cutting part 43 between one end of the grass sheet main body 10 is included. Through this step, the weedproof sheet main body 10 as shown in FIG. 3 can be obtained. The shape of the main body opening 11 before penetrating the column is preferably similar to the shape of the cross section of the column 23 and is 1 to 20 mm larger than the longest dimension of the cross section of the column 23. Moreover, it is preferable to form the main body cutting part 43 so that the distance between one point of the main body opening 11 and one point of the end of the weedproof sheet main body 10 is the shortest distance.

  In addition, the method for constructing a weedproof structure according to the present invention includes forming a patch opening 42 in the patch sheet 40, and cutting the patch between one point of the patch opening 42 and one end of the patch sheet 40. Forming the portion 44. By this step, a patch sheet 40 as shown in FIG. 4 can be obtained. The shape of the patch sheet 40 is a square or a rectangle, and the length of one side of the square or the rectangle is preferably 100 to 400 mm longer than the longest dimension Dp of the cross-sectional shape of the column 23. The shape of the patch opening 42 before penetrating the struts is preferably similar to the cross-sectional shape of the struts 23 and is the same as or smaller than the cross-sectional shape of the struts 23. The ratio Dh / Dp between the longest dimension Dh of the shape of the patch opening 42 before penetrating and the longest dimension Dp of the cross-sectional shape of the strut 23 is preferably 0.5 or more and less than 1. Moreover, it is preferable that the patch sheet 40 has extensibility at least in a plane direction, and the tensile elongation rate of the patch sheet 40 is 20% or more.

  Moreover, the construction method of the weedproof structure of the present invention allows the support 23 to penetrate the weedproof sheet main body 10 by passing the main body cutting part 43 through the main body opening 11 of the weedproof sheet main body 10, and enters the grassproof area. A step of laying the weedproof sheet main body 10 is included. By this step, a structure as shown in FIGS. 5 and 6 can be obtained. In addition, illustration of the guardrail 24 is abbreviate | omitted in FIG.

  In the construction method of the weedproof structure according to the present invention, the patch cutting part 44 is passed through the patch opening 42 to penetrate the patch sheet 40 to cover the main body cutting part 43 and the main body cutting part 43. And a step of laying the patch sheet 40 on the weedproof sheet main body 10 so that the patch cutting part 44 does not overlap. By this step, a structure as shown in FIGS. 7 and 8 can be obtained. In FIG. 7, illustration of the guard rail 24 is omitted. At this time, the shapes of the main body cutting portion 43 and the patch cutting portion 44 are linear, and in the step of laying the patch sheet 40, an angle around the column center position between the main body cutting portion 43 and the patch cutting portion 44 (see FIG. It is preferable to lay the patch sheet 40 so that the angle θ) shown in 9 is 90 to 270 degrees. In addition, illustration of the guardrail 24 is abbreviate | omitted in FIG.

  The weedproof sheet body 10 and the patch sheet 40 laid on the weedproof sheet body 10 are preferably fixed by a heat fusion method or a tape bonding method. From the standpoint of ensuring the fixation, it is preferable to fix the weedproof sheet main body 10 and the patch sheet 40 by a heat fusion method. In addition, it is preferable to use the tape bonding method when the use of fire is restricted, such as in the case of installation near a residential area or when there are many combustibles such as undergrass near the installation location.

  Moreover, it is preferable to further include a step of filling a silicon-based sealing material between the main body opening 11 and the support 23 and / or between the patch opening 42 and the support 23.

  When the grass protection area is a grass protection area adjacent to the pavement surface 21, such as a road slope 30, the step of laying the grass protection sheet body 10 in the grass protection area is performed on the grass protection sheet body 10. The process which arrange | positions the 1st end part 12 so that it may overlap with the pavement surface edge part 22, and the process of fixing the 1st end part 12 of the weed prevention sheet main body 10 to the pavement surface edge part 22 by heat fusion or tape bonding. And fixing the first end portion 12 of the weedproof sheet main body 10 to the paved surface end portion 22 by the first nail-like tool 14 and the side opposite to the first end portion 12 of the weedproof sheet main body 10 The second end portion 13 is preferably fixed to the ground by the second nail-like instrument 15.

  The construction method of the weedproof structure according to the present invention can achieve a more excellent effect when the attachment is continuously attached to the plurality of support columns 23 like a guardrail.

  When the construction method of the weed prevention structure is used in a place where the pavement surface 21 is the pavement surface 21 of the asphalt pavement and the grass prevention area is the slope 30 of the asphalt pavement, the further excellent effect of the present invention is achieved. Can be obtained.

<Material of the weed prevention sheet body and patch sheet>
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. Moreover, the patch sheet 40 can use the same thing as the weedproof sheet 10 as a material.

  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 type 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 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.

  It is preferable to use a modified asphalt type herbicidal sheet as at least one material of the herbicidal sheet body 10 and the patch sheet 40 used in the herbicidal structure of the present invention. When a modified asphalt type grass protection sheet is used as at least one material of the grass protection sheet main body 10 and the patch sheet 40, the surface of the grass protection sheet main body 10 and the patch sheet 40 are bonded by a heat fusion method. Since it is easy to use, the adhesion can be ensured, and the patch sheet 40 and the support post 23 can be fused with the modified asphalt component heated and melted to enhance the herbicidal effect. It is.

  Moreover, it is preferable to use a modified asphalt type herbicidal sheet as a material of the patch sheet 40 used in the herbicidal structure of the present invention. Furthermore, a modified asphalt type herbicidal sheet having a predetermined stretchability can be preferably used. By using the modified asphalt-type herbicidal sheet having stretchability, the shape of the patch opening 42 before penetrating the support post 23 is similar to the cross-sectional shape of the support post 23 and smaller than the cross-sectional shape of the support post 23. In this case, the support 23 can penetrate the patch opening 42 without a gap by utilizing the stretchability of the patch sheet.

  Moreover, in the construction method of the weedproof structure of the present invention, the modified asphalt-based weedproof sheet is used as the material of the patch sheet 40, and the end of the patch opening 42 of the patch sheet 40 is directed to the side surface of the column 23. It is preferable to fix by a heat fusion method. As shown in FIG. 16, by providing the heat fusion part 45 using the heat fusion method, the patch sheet 40 and the support 23 can be more reliably bonded and fixed, and the generation of the gap is ensured. This is because it can be prevented.

  Moreover, it is particularly preferable that at least one of the weedproof sheet main body 10 and the patch sheet 40 included in the weedproof structure of the present invention is a penetration-resistant weedproof sheet that is a kind of modified asphalt type herbicide sheet.

<Penetration-proof grass protection sheet>
Next, the herbicidal sheet is particularly preferably used for the herbicidal sheet body and / or patch sheet of the herbicidal structure of the present invention. 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 preferable for use in the weedproof structure of the present invention because it is excellent in penetration prevention against hard and sharp weed buds. By using a penetration-proof grass-proof sheet main body as the grass-proof sheet main body and / or patch sheet of the grass-proof structure of the present invention, a grass-proof structure having outstanding herbicidal performance and excellent durability, and its A construction method can be obtained.

<Aspects of penetration-proof grass protection 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.

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

<Details of penetration-proof grass protection sheet>
In FIG. 17, 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. The penetration-proof grass protection sheet has light-shielding and weather resistance to prevent grass growth on the ground, surfaces, especially slopes, 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) Base material layer>
(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.

<(C) Base material A of base material layer>
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) 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 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.

<(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 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.

<(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. 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) 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 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 is 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) 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, 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 added, sprayed, applied or impregnated as necessary 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, 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 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 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. 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 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 arranged on the slope, it has excellent water impermeability at the top of the slope. Not only can it form a layer and block water essential for the growth of weeds, but if the slope is constructed with embankments, it is a method that accompanies the infiltration of rainwater from the top of the slope (shoulder) By effectively preventing water from the surface itself, it is possible to avoid the collapse of the slope ground due to heavy rain.

<(E) Back layer>
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 copolymers) and the like can be used a hydrogenated product thereof.

  As the polyolefin elastomer, amorphous or low crystalline α-olefin (co) polymer such as amorphous polypropylene, a mixture of polyolefin and olefin 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 rubber 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.

<Manufacturing method>
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.

<Characteristics of 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 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 20% 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-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 30 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 tensile strength in the machine direction to the transverse direction is preferably in the range of 0.60 to 1.70, 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 0.50 to 2.0, more preferably in the range of 0.80 to 1.20, 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, surface, especially slopes of roads, railways, rivers, parks or afforestation areas, and their surroundings, and is not water-permeable. In addition, it is possible to prevent water from being sloped due to concentrated heavy rain and the like, and in particular, it is possible to obtain a herbicidal structure that is 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 to experimental examples as reference examples. However, the penetration-resistant weedproof sheet that can be used in the present invention is not limited in any way.

<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. 20A and 20B, 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. 18, 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; 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 bud of Chigaya is shown in FIG. 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, 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. When biaxially stretched polypropylene, which is a kind of hard synthetic resin, is used, the film layer surface is hard and the film surface is more slippery than high-density polyethylene. This is probably due to the fact that it was able to escape in the direction of.

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 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 of the weed prevention structure of the present invention. It is a cross-sectional schematic diagram of the grass protection area suitable for installing the grass protection structure of this invention. It is a plane schematic diagram of an example of the weedproof sheet main body contained in the weedproof structure of the present invention. It is a plane schematic diagram of an example of the patch sheet contained in the weedproof structure of the present invention. It is an upper surface schematic diagram at the time of laying the grass-proof sheet main body in a grass-proof area. It is a cross-sectional schematic diagram at the time of laying the weed prevention sheet main body in a weed prevention area. It is an upper surface schematic diagram at the time of laying a patch sheet on a weedproof sheet main body. It is a cross-sectional schematic diagram at the time of laying a patch sheet on the weedproof sheet main body. It is a cross-sectional schematic diagram when a patch sheet is laid on the weedproof sheet main body so that the angle around the column center position of the main body cutting part and the patch cutting part is θ. It is a plane schematic diagram of an example of the conventional weed prevention structure. It is a cross-sectional schematic diagram of an example of the conventional weed prevention structure. It is a plane schematic diagram of the example which fixed the grass prevention sheet to the slope using the mesh-shaped presser of the grass protection structure of the present invention. It is a cross-sectional schematic diagram of the example which fixed the weedproof sheet to the slope using the mesh-shaped pressing tool of the weedproof structure of this invention. It is a cross-sectional schematic diagram of the vicinity of the slope of one aspect of the weedproof structure of the present invention, and is an example in which a slope excavation part is provided on the slope for fixing the weedproof sheet. It is a cross-sectional schematic diagram of the vicinity of the slope of one embodiment of the weedproof structure of the present invention, and is an example in which the second end is embedded in the slope for fixing the weedproof sheet. It is an enlarged view of the cross-sectional schematic diagram of the vicinity of the support | pillar of the one aspect | mode of the weed prevention structure of this invention, and is an example which shows the state which the patch sheet edge part heat-fused to the support | pillar surface. 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: Tip portion of measuring jig 8: Weedproof sheet 10: Weedproof sheet main body 11: Main body Opening part 12: First end part 13: Second end part 14: First nail-like instrument 15: Second nail-like instrument 16: Reinforcing bar 17: Weedproof sheet main body overlapping fusion part 18: Lateral end part (Fusion processing)
19: Lateral end (pin fixing process)
21: Pavement surface 22: End portion of pavement surface 23: Support column 24: Guard rail 25: Guard rail mounting tool 26: Support column center position 27: Mesh presser 30: Slope 31: Slope digging unit 32: Slope embedded unit 40: Patch sheet 42: Patch opening 43: Main body cutting part 44: Patch cutting part 45: Heat-sealed part when modified asphalt is used as the patch sheet material Dh: Longest dimension of the shape of the main body opening before penetrating Dp : The longest dimension of the cross-sectional shape of the column L1: Length of the weedproof sheet main body L2: Length of the weedproof sheet main body fusion part θ: Angle around the column center position of the main body cutting part and the patch cutting part

Claims (14)

A construction method for installing a grass protection structure including a grass protection sheet body and a patch sheet in a grass protection area having a support to which an attachment is attached,
A step of forming a main body cutting portion at a position of the herbicidal sheet main body corresponding to the column position between the main body opening and one point of the main body opening and one end of the weedproof sheet main body. When,
Forming a patch cutting part between the patch opening and one point of the patch opening and one end of the patch sheet on the patch sheet;
Is communicated transmural struts to the body opening by passing the body cutting unit, a step of laying a weed sheet body weed zone,
The strut by passing the patch cutting section passed through the patch openings, covers all the main cutting unit and so as not to overlap with each other and the main cutting section and the patch cutting section, laying a patch sheet on weed seat body A method for constructing a weedproof structure.   The construction method according to claim 1, wherein the shape of the patch opening before penetrating is similar to the shape of the cross section of the post and smaller than the shape of the cross section of the post.   The construction method according to claim 2, wherein a ratio Dh / Dp between the longest dimension Dh of the shape of the patch opening before penetrating through and the longest dimension Dp of the cross-sectional shape of the pillar is 0.5 or more and less than 1.   The construction method according to claim 2 or 3, wherein the patch sheet has extensibility at least in a plane direction, and the tensile elongation of the patch sheet is 20% or more.   The construction method according to any one of claims 1 to 4, wherein the weedproof sheet main body and / or the patch sheet is a modified asphalt type weedproof sheet.   The construction according to any one of claims 1 to 5, wherein the shape of the main body opening before penetrating the pillar is similar to the shape of the cross section of the pillar and is 1 to 20 mm larger than the longest dimension of the cross section of the pillar. Method.   The construction method according to any one of claims 1 to 6, wherein the main body cutting portion is formed such that a distance between one point of the main body opening and one point of the end portion of the weedproof sheet main body is the shortest distance. .   The construction according to any one of claims 1 to 7, wherein the patch sheet has a square or rectangular shape, and the length of one side of the square or rectangular shape is 100 to 400 mm longer than the longest dimension Dp of the cross-sectional shape of the column. Method.   The shape of the main body cutting portion and the patch cutting portion is linear, and in the step of laying the patch sheet, the angle of the main body cutting portion and the patch cutting portion around the column center position is 90 to 270 degrees. The construction method according to claim 1, wherein a patch sheet is laid.   The construction method according to claim 1, further comprising a step of filling a silicon-based sealing material between the main body opening and the support column and / or between the patch opening and the support column. The grass protection area is a grass protection area adjacent to the pavement surface, and the step of laying the grass protection sheet main body in the grass protection area,
Arranging the first end of the weedproof sheet main body so as to overlap the paved surface end,
Fixing the first end of the weedproof sheet body to the paved surface end by heat fusion or tape bonding;
Fixing the first end of the weedproof sheet main body to the paved surface end with the first nail-like tool;
The construction method of any one of Claims 1-10 including the process of fixing the 2nd end part on the opposite side to the 1st end part of a weedproof sheet main body to the ground with a 2nd nail-like instrument. .   The construction method according to claim 11, wherein the paved surface is a paved surface of an asphalt paved road, and the grass protection area is a slope of the asphalt paved road.   The construction method according to claim 1, wherein the attachment is a guard rail.   The weed prevention structure constructed | assembled by the construction method of any one of Claims 1-13.