Sheet joint structure and method for joining and laying sheets

Abstract

To provide a sheet joining structure and a method for joining and laying sheets, capable of sufficiently and reliably suppressing the growth of specific plants such as giant knotweed, which grow relatively tall. A side edge portion 8a-1 of one sheet 4a and a side edge portion 8b-2 of the other sheet 4b are laminated in this order on the upper surface of a flat connecting substrate 6, and these are fixed to the upper surface of the connecting substrate 6 with fixing needles 10.

Description

[Technical Field]

[0001] The present invention relates to a joining structure for sheets and a method for joining and laying sheets. [Background technology]

[0002] Generally, the topsoil of the slopes of embankments on river banks and road embankments is covered with turfgrass to prevent erosion from rainfall and floods. Because the slopes are exposed, seeds of plants other than turfgrass can naturally drift to the slopes and grow there. One example of such a plant seed is Japanese knotweed. Japanese knotweed can grow to a height of about 3m when grown. For this reason, if Japanese knotweed grows excessively on the slopes, visibility near the slopes becomes poor, which is undesirable from the perspective of traffic and public safety, so the grown Japanese knotweed is regularly removed.

[0003] For example, as shown in Patent Document 1 below, there is a mesh-like synthetic resin sheet that is laid on topsoil to suppress or control plant growth. This sheet is rectangular, with one side edge folded from front to back and the other side edge folded from back to front. The sheet is stored in roll form with both side edges folded as described above, and can be obtained by pulling out a required amount from the roll and cutting it. Since the width of the sheet pulled out from the roll is constant, multiple sheets are usually joined when laying the sheet on topsoil in a required area. Patent Document 1 below also discloses a joining structure for joining two sheets, in which one side edge of one sheet is interlocked with the other side edge of the other sheet. This joining structure is fixed to the topsoil by inserting the tip of an anchor pin from above into one side edge of one interlocked sheet and the other side edge of the other sheet and inserting it into the topsoil. A plurality of anchor pins are arranged at intervals in the longitudinal direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6872419 Summary of the Invention [Problem to be solved by the invention]

[0005] According to the experience of the present inventors, when the sheet disclosed in Patent Document 1 is laid on the topsoil, if the mesh size of the sheet is too large, relatively tall plants such as Japanese knotweed (hereinafter referred to as "specific plants") will be able to grow through the mesh and will not be able to sufficiently suppress the growth of the specific plants, while if the mesh size of the sheet is too small, not only the growth of the specific plants but also the growth of relatively short plants such as turfgrass (hereinafter referred to as "other plants") will be suppressed. If the growth of other plants is also suppressed, the topsoil on the slope will be exposed and will not be protected from erosion due to rainfall and floods, which is undesirable.

[0006] Furthermore, the joint structure shown in Patent Document 1 simply involves the engagement of one side edge of one sheet folded in opposite directions with the other side edge of the other sheet, and therefore the strength of the joint structure is insufficient even if anchor pins are used to secure the sheets to the topsoil at intervals in the longitudinal direction. Therefore, if a specific plant is positioned below the anchor-pin-free area between the anchor pins in the joint structure, the specific plant may forcibly release the interlocking in the anchor-pin-free area and grow. Certain plants have incredible vitality, and the upward pressure exerted by their growth (called "growth pressure") can forcibly release the interlocking.

[0007] The present invention has been made in consideration of the above facts, and its main technical object is to provide a new and improved sheet joining structure and a method for joining and laying sheets that can sufficiently and reliably suppress the growth of the above-mentioned specific plants. [Means for solving the problem]

[0008] After extensive research, the inventors discovered that the above-mentioned main technical problem can be solved by sequentially stacking the side edge portions of one sheet and the other sheet on the top surface of a flat connecting substrate and then fixing them to the top surface of the connecting substrate with fixing needles.

[0009] That is, according to a first aspect of the present invention, as a sheet joining structure that solves the above-mentioned main technical problem, there is provided a joining structure for joining two mesh-like synthetic resin sheets laid on topsoil, The sheet is provided with a flat connecting substrate extending along the side edges of the sheets, and the side edge portion of one sheet and the side edge portion of the other sheet are sequentially stacked on the upper surface of the connecting substrate, and the side edge portion of the other sheet and the side edge portion of the one sheet are fixed to the upper surface of the connecting substrate by fixing needles. and the connecting substrate is fixed to the topsoil by a lift-preventing means that penetrates the topsoil, The lift-up prevention means is an anchor pin, and the tip of the anchor pin penetrates from the upper surface of the side edge of the other sheet, through the side edge of the other sheet, the side edge of the one sheet, and the connecting base material in this order, and then penetrates into the topsoil. A joint structure is provided.

[0010] Furthermore, according to a second aspect of the present invention, a method for joining and laying sheets that solves the above-mentioned main technical problem is a method for joining two mesh-like synthetic resin sheets and laying them on topsoil, comprising: A placing step of placing a flat connecting base material extending along the side edge of the sheet on the topsoil; a lamination step of laminating a side edge portion of one sheet and a side edge portion of the other sheet sequentially on the upper surface of the connecting substrate; a joining step in which, after the lamination step, fixing needles are driven from the upper surface of the side edge of the other sheet to the upper surface of the connecting substrate to fix the side edge of the other sheet and the side edge of the one sheet to the connecting substrate; 、 After the joining step, an anchor pin, which is a means for preventing lifting, is driven into the topsoil from the upper surface of the side edge of the other sheet to fix the side edge of the other sheet, the side edge of the one sheet, and the connecting base material to the topsoil. A method is provided, comprising:

[0011] In the first aspect of the present invention, it is preferable that the sheet has a rectangular shape, and one side edge of the one sheet and the other side edge of the other sheet are laminated in this order on the upper surface of the connecting substrate.Furthermore, it is preferable that the fixing needle is a U-shaped needle, and the tip of the U-shaped needle penetrates from the upper surface of the side edge of the other sheet, through the side edge of the other sheet and the side edge of the one sheet in this order, and then sticks into the upper surface of the connecting substrate. 。 [Effects of the Invention]

[0012] Furthermore, in the first and second aspects of the present invention, the side edge of one sheet and the side edge of the other sheet are sequentially stacked and fixed on the upper surface of the flat connecting base material, so even if a specific plant grows below the side edge of one sheet, the specific plant will not directly act on the side edge of one sheet because there is a flat connecting base material between the specific plant and the side edge of one sheet.As a result, the specific plant will not damage the stack and grow between the side edge of one sheet and the side edge of the other sheet, and the growth of the specific plant will be sufficiently and reliably suppressed. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram showing two sheets joined together by a preferred embodiment of a joining structure constructed according to the present invention; [Figure 2] 2A and 2B are cross-sectional views of the joining structure shown in FIG. 1, showing (a) a position where a fixed needle is disposed and (b) a position where a lift-up prevention means is disposed. [Figure 3-1] FIG. 2 is a diagram illustrating the process of laying two sheets on the topsoil using the joint structure shown in FIG. 1. [Figure 3-2] FIG. 2 is a diagram illustrating the process of laying two sheets on the topsoil using the joint structure shown in FIG. 1. [Figure 4] 2 is a graph showing the results of investigating the growth process of a specific plant and other plants by adjusting the mesh size of the sheet shown in FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0014] Further details will be described below with reference to the accompanying drawings.

[0015] FIG. 1 shows a preferred embodiment of a joint structure constructed according to the present invention. The joint structure, generally designated by the numeral 2, includes sheets 4a and 4b and a connecting substrate 6. The sheets 4a and 4b are general-purpose resin nets, primarily used in civil engineering, molded primarily from polyethylene, polypropylene, polyester, or polyamide, and have numerous openings, or meshes, formed in a regular or irregular pattern. The mesh shape may be any shape, such as circular, rectangular, diamond, or tortoiseshell. The mesh size is preferably 2.0 mm or more but less than 6.0 mm, and more preferably 2.7 mm or more but less than 5.8 mm. This will be discussed later. In the illustrated embodiment, the sheets 4a and 4b are drawn from a common roll and cut to the required length. That is, the sheets 4a and 4b are rectangular, with the same properties, thickness (approximately 5.0 to 6.0 mm), width (100 to 140 cm), and length in the longitudinal direction. The connecting base material 6 is made of wood and has a flat plate shape that extends linearly in the longitudinal direction, i.e., along the side edges of the sheets 4a and 4b, and is about 1.0 cm thick and 5.0 to 10.0 cm wide. The connecting base material 6 should preferably have a longitudinal length similar to that of the sheets 4a and 4b.

[0016] 2(a), in a connection structure constructed according to the present invention, the side edge portions of sheets 4a and 4b are sequentially laminated on the upper surface of connecting substrate 6. In the illustrated embodiment, sheets 4a and 4b are rectangular, so one side edge portion 8a-1 of sheet 4a and the other side edge portion 8b-2 of sheet 4b are sequentially laminated on the upper surface of connecting substrate 6. Then, the side edge portion of the other sheet 4b and the side edge portion of one sheet 4a are fixed to the upper surface of connecting substrate 6 by fixing needles. In the illustrated embodiment, the fixed needles are metal U-shaped needles 10 (the hatching of the U-shaped needles 10 is omitted in FIG. 2(a) for ease of understanding). The tips of these U-shaped needles 10 penetrate from the top surface of the other side edge 8b-2 of the other sheet 4b, through the other side edge 8b-2 of the other sheet 4b, and through one side edge 8a-1 of one sheet 4a, and then penetrate into the top surface of the connecting substrate 6. The U-shaped needles 10 can be pierced into the top surface of the connecting substrate 6 using a so-called stapler. As can be understood by referring to FIG. 1, in the illustrated embodiment, the U-shaped needles 10 are arranged in a staggered pattern in the longitudinal direction, that is, alternately at equal intervals in the longitudinal direction. The U-shaped needles 10 are arranged on both side edges of the connecting substrate 6. By arranging the U-shaped needles 10 in a staggered pattern, the one side edge 8a-1 of the sheet 4a and the other side edge 8b-2 of the sheet 4b are firmly fixed to the top surface of the connecting substrate 6. If desired, the fixation needle may be a nail or the like.

[0017] Referring to Figure 2(b), , contact The base material 6 is a means for preventing lifting by sticking into the topsoil. fixed in the topsoil by The lift-off prevention means is a metal anchor pin 12 having a length of about 20 cm (the hatching of the anchor pin 12 is omitted in FIG. 2(b) for ease of understanding), and the tip of the anchor pin 12 passes through the upper surface of the other side edge 8b-2 of the other sheet 4b, the other side edge 8b-2 of the other sheet 4b, one side edge 8a-1 of one sheet 4a, and the connecting base material 6 in that order, before being stuck into the topsoil. In the illustrated embodiment,A plurality of anchor pins 12 are arranged at intervals of about 1 m to 1.5 m in the longitudinal direction, and the number of anchor pins 12 is smaller than the number of U-shaped needles 10. In addition, in a plan view, the anchor pins 12 are arranged in the center of the width direction of the connecting substrate 6. By having the anchor pins 12, which serve as lift-up prevention means, penetrate into the topsoil, the connecting structure 2 is prevented from lifting up from the topsoil even if a specific plant such as Japanese knotweed grows below the connecting structure 2 and attempts to lift the connecting structure 2 upward due to the growth pressure caused by the growth, as described above. If desired, the lift-up prevention means may be arranged in advance on the underside of the connecting substrate 6, and the lift-up prevention means may penetrate into the topsoil when the connecting substrate 6 is placed on the topsoil.

[0018] Next, with reference to Figs. 3-1 and 3-2, the process of joining two sheets, i.e., sheets 4a and 4b, using the joining structure 2 described above and laying them on the topsoil will be described. First, as shown in Fig. 3-1(a), the connecting substrate 6 is placed on the topsoil (placing process). Next, as shown in Figs. 3-1(b) and (c), one side edge 8a-1 of one sheet 4a and the other side edge 8b-2 of the other sheet 4b are sequentially stacked on the upper surface of the connecting substrate 6 (stacking process). After that, as shown in Fig. 3-2(d), a U-shaped needle 10, which is a fixing needle, is driven from the upper surface of the other side edge 8b-2 of the other sheet 4b into the upper surface of the connecting substrate 6, thereby fixing and joining the one side edge 8a-1 of one sheet 4a and the other side edge 8b-2 of the other sheet 4b to the connecting substrate 6 (joining process). .So of laterAs shown in Figure 3-2(e), an anchor pin 12, which serves as a lift-up prevention device, is driven into the topsoil from the top surface of the other side edge 8b-2 of the other sheet 4b, thereby fixing the other side edge 8b-2 of the other sheet 4b, the one side edge 8a-1 of the one sheet 4a, and the connecting base material 6 to the topsoil (anchor process). If desired, before driving the anchor pin 12, a through-hole penetrating vertically may be pre-formed at a desired position in the connecting base material 6, and the anchor pin 12 may be inserted into the through-hole. Pre-forming the through-hole allows for smooth driving of the anchor pin 12. Alternatively, the lift-up prevention device may be a so-called screw nail. When the lift-up prevention device is a screw nail, the lift-up prevention device can be driven into the topsoil using an automatic tool such as an electric screwdriver, eliminating the need for the through-hole, and facilitating installation. Thus, the two sheets, i.e., sheets 4a and 4b, are joined by the joining structure 2 and laid in the topsoil. If desired, one side edge 8a-1 of one sheet 4a and the other side edge 8b-2 of the other sheet 4b may be stacked in sequence, and then the connecting substrate 6 may be inserted between the topsoil and one side edge 8a-1 of one sheet 4a, or one side edge 8a-1 of one sheet 4a and the other side edge 8b-2 of the other sheet 4b may be fixed and joined to the upper surface of the connecting substrate 6, and then the connecting substrate 6 may be placed on the topsoil.

[0019] In the present invention, one side edge 8a-1 of one sheet 4a and the other side edge 8b-2 of the other sheet 4b are sequentially stacked and fixed on the upper surface of the flat connecting base material 6, so even if a specific plant grows below one side edge 8a-1 of one sheet 4a, the flat connecting base material 6 exists between the specific plant and one side edge 8a-1 of one sheet 4a, so the specific plant does not directly act on one side edge 8a-1 of one sheet 4a.Therefore, the specific plant will not damage the stack and grow between the side edge of one sheet and the other sheet, and the growth of the specific plant is sufficiently reliably suppressed.

[0020] Next, referring to Figure 4, we will explain the results of an investigation into the growth of plants in the topsoil after laying multiple mesh synthetic resin sheets with adjusted mesh sizes on the topsoil. As mentioned above, plants can be broadly divided into specific plants, such as Japanese knotweed, that grow relatively tall (approximately 3 m), and other plants, such as turfgrass, that remain relatively short. While there are no clear guidelines, considering the average height of first-grade elementary school students is approximately 115 cm, it is recommended that the upper limit of height for plants growing on river banks or road embankments be approximately 100 cm (preferably approximately 80 cm) from the perspective of traffic and safety. Based on this, four mesh synthetic resin sheets with identical shapes and properties, except for mesh sizes of 1.1 mm, 2.7 mm, 3.2 mm, and 5.8 mm, were prepared and laid closely together on the topsoil. The growth history of plants (specific plants and other plants) in the topsoil where each sheet was laid is shown in Figure 4. The graph in Figure 4 shows the date on the horizontal axis (for example, "R5.9.7" means "September 7, 2023") and the height on the vertical axis, with the black bars representing the measured height of specific plants and the white bars representing the measured height of other plants for each mesh size of the sheet. Note that the "none" shown at the right end of the horizontal axis in the figure represents the measurement result when the sheet was not applied.

[0021] Referring to Figure 4, it can be seen that the growth of the specific plant was significantly suppressed when the sheet was laid compared to when it was not laid. Next, it can be seen that the height of the specific plant was suppressed to within 100 cm with all four sheets prepared. From this, it is estimated that the upper limit of mesh size for suppressing the height of the specific plant to within 100 cm is approximately 6.0 mm. On the other hand, since other plants did not grow with a mesh size of 1.1 mm but grew with a mesh size of 2.7 mm, it is estimated that the lower limit of mesh size is approximately 2.0 mm. Therefore, it is preferable that the mesh size be between 2.0 mm and 6.0 mm.

[0022] In the illustrated embodiment, the mesh size of the sheet is 2.0 mm or more and less than 6.0 mm, so that only the growth of specific plants is suppressed, while the growth of other plants is not suppressed. Therefore, the topsoil of the slope is appropriately protected by plants (specific plants and other plants), while maintaining good visibility near the slope, ensuring traffic and public safety on the slope. Furthermore, since there is no need to periodically weed the specific plants, the maintenance costs of the slope are reduced.

[0023] The preferred embodiments of the sheet joining structure and sheet joining and laying method according to the present invention have been described above in detail with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and appropriate modifications and variations are possible within the scope of the present invention. For example, in the illustrated embodiment, two sheets with the same properties are joined, but two sheets with different properties may also be joined. Furthermore, the sheets do not necessarily have to be rectangular, but may have any shape, such as a polygon. The connecting substrate 6 may be composed of a single plate material or multiple plate materials connected longitudinally. In the latter case, adjacent plate materials in the longitudinal direction can be connected with U-shaped needles 10. [Explanation of symbols]

[0024] 2:Joint structure 4a and 4b: Sheets 6: Connection substrate 8a-1: One side edge of sheet 4a 8b-2: Other side edge of sheet 4b 10: U-shaped needle (fixed needle) 12: Anchor pin (prevents lifting)

Claims

1. A joining structure for joining two mesh-shaped synthetic resin sheets laid on topsoil, A flat connecting base material is provided that extends along the side edges of the sheets, and the side edge portion of one sheet and the side edge portion of the other sheet are sequentially stacked on the upper surface of the connecting base material, and the side edge portion of the other sheet and the side edge portion of the one sheet are fixed to the upper surface of the connecting base material by fixing needles, and the connecting base material is fixed to the topsoil by means for preventing lift-up that is inserted into the topsoil, The means for preventing lifting is an anchor pin, and the tip of the anchor pin passes through the top surface of the side edge of the other sheet, the side edge of the other sheet, the side edge of the one sheet, and the connecting base material in that order, before being inserted into the topsoil, forming a joining structure.

2. 2. The joining structure according to claim 1, wherein the sheets are rectangular, and one side edge of the one sheet and the other side edge of the other sheet are laminated in this order on the upper surface of the connecting substrate.

3. 2. The joining structure according to claim 1, wherein the fixed needle is a U-shaped needle, and the tip of the U-shaped needle penetrates from the upper surface of the side edge of the other sheet through the side edge of the other sheet and the side edge of the one sheet in sequence, and then penetrates into the upper surface of the connecting substrate.

4. A method for joining two mesh synthetic resin sheets and laying them on topsoil, comprising: A placing step of placing a flat connecting base material extending along the side edge of the sheet on the topsoil; a lamination step of laminating a side edge portion of one sheet and a side edge portion of the other sheet sequentially on the upper surface of the connecting substrate; a joining step in which, after the lamination step, fixing needles are driven from the upper surface of the side edge portion of the other sheet to the upper surface of the connecting substrate to fix the side edge portion of the other sheet and the side edge portion of the one sheet to the connecting substrate; After the joining step, the method includes an anchoring step in which an anchor pin, which is a means for preventing lifting, is driven into the topsoil from the upper surface of the side edge of the other sheet to fix the side edge of the other sheet, the side edge of the one sheet, and the connecting substrate to the topsoil.

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