Sheet material retaining stakes

Abstract

This makes it easier to pull out and remove sheet-like material retaining stakes that are attached to sheet-like materials by being driven into the ground. [Solution] The pile body 2 has locking plate portions 11 on its circumferential surface portion 10, which protrude at required intervals around the axis of the pile body 2. The locking plate portion 11 is triangular in shape with one vertex portion 12 located outward from the circumferential surface portion 10. The side portion above the vertex portion 12 is an upper linear inclined side portion 15 that slopes linearly upward from the vertex portion toward the upper end of the side portion, and the side portion below the vertex portion is a lower inclined side portion 19 that slopes downward from the vertex portion toward the lower end of the side portion. When the sheet-like retaining pile 1, which has been driven into the ground after piercing through the sheet-like material 7 to form a hole 43, is pulled up, the upper linear inclined side portion 15 causes the edge portion of the hole 43 or the fibers forming the edge portion to slide toward the vertex portion 12 of the upper linear inclined side portion 15.

Description

Technical Field

[0001] The present invention relates to a sheet pressing pile for pressing and fixing various sheet-like materials such as a weed control sheet to the ground. More specifically, it relates to a sheet pressing pile that can facilitate the removal of the pile from the state of being attached to the sheet-like material by driving.

Background Art

[0002] As an example of a conventional sheet pressing pile used for pressing and fixing a sheet-like material such as a weed control sheet, a disaster prevention sheet (such as a blue sheet) during a disaster, a light shielding sheet, an agricultural sheet such as a mulch, or a sheet for greening to the ground, what is disclosed in Patent Document 1 has been proposed.

[0003] In FIGS. 2 and 3 of Patent Document 1, as an example of a sheet pressing pile (hereinafter also referred to as a pile in the description of the background art), on the lower surface of a pressing plate that presses the sheet-like material to the ground in the form of a disc shape or a cross-shaped plate, a support pile with a smooth peripheral surface is provided protruding downward. The sheet pressing pile presses and fixes the pressing plate to the ground by pushing the support pile into the soil. However, this type of sheet pressing pile has a drawback that the peripheral surface of the support pile is smooth, so it is easy to come out, and as a result, the sheet-like material is easily peeled off by the wind.

[0004] Therefore, the sheet pressing pile disclosed in FIG. 4 of Patent Document 1 has been proposed. The pile has, for example, a reverse triangular plate shape, and a retaining piece protrudes from the side surfaces of the flat plate-shaped pile body that is pushed into the soil, and the upper surface of the retaining piece is formed in a horizontal plane shape.

[0005] To press and fix the sheet-like material to the ground using a pile having such a configuration, after the lower end of the pile is applied to a required part of the sheet material, the upper end of the pile is pressed with a hammer. As a result, the pile breaks through the sheet-like material to form a hole and is pushed into the soil, and the pressing plate of the pile presses and fixes the sheet-like material to the ground.

[0006] Incidentally, when replacing the sheet-like material, the sheet-like material retaining stakes can be reused if they are not damaged. Therefore, an attempt is made to remove the stakes from the sheet-like material, such as the weed control sheet. However, when the sheet-like material is pressed down and secured to the ground, the stakes may pierce through the sheet-like material and form holes, and as a result, the fibers that make up the sheet-like material may be scattered around the edges of these holes. Therefore, when attempting to remove the stakes from the sheet-like material, the edges of the holes or the fibers forming those edges tend to get caught on the horizontal surface of the retaining piece, making it difficult to remove the stakes from the sheet-like material.

[0007] Furthermore, when fixing the sheet-like material to the ground, if the lower end of the stake hits a small stone or the like in the ground, making it difficult to drive it in further, the partially driven stake is temporarily pulled out of the sheet-like material, and then driven in again in a different location on the sheet-like material. However, in this case as well, the horizontal upper surface of the retaining piece gets caught on the edge of the hole or the fibers forming the edge, making it difficult to remove the stake from the sheet-like material. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Utility Model Publication No. 6-86442 [Overview of the project] [Problems that the invention aims to solve]

[0009] The present invention was developed in view of the aforementioned conventional problems, and aims to provide a sheet-like material retaining stake that is easy to drive into the ground and can secure the required resistance to being pulled out, and moreover, when a stake driven into the ground to hold down and fasten a sheet-like material such as a weed control sheet to the ground is to be reused when the sheet-like material is replaced, or when it becomes difficult to drive the stake further into the ground due to obstacles such as pebbles in the ground, the present invention aims to provide a sheet-like material retaining stake that can be easily pulled out from the hole made in the sheet-like material by being driven into the ground. [Means for solving the problem]

[0010] To solve the aforementioned problems, the present invention employs the following means. That is, the first embodiment of the sheet-like material retaining pile according to the present invention is a sheet-like material retaining pile used to press and fasten a sheet-like material to the ground, wherein a pressing portion and a sheet-like material retaining portion are provided at the upper end of the pile body, and a plurality of locking plate portions are provided on the circumferential surface of the pile body at required intervals around the axis of the pile body and protruding from the circumferential surface. The locking plate portion has a triangular plate shape with one vertex located away from the circumferential surface of the pile body, the side portion above the vertex portion is an upper linear inclined side portion that slopes linearly upward from the vertex portion toward the upper end of the side portion, and the side portion below the vertex portion is a lower inclined side portion that slopes downward from the vertex portion toward the lower end of the side portion. Furthermore, when the sheet-like retaining pile, which has been driven into the ground after piercing through the sheet-like material to form a hole, is pulled up, the upper straight-line inclined edge portion causes the edge portion of the hole and the fibers forming the edge portion to slide toward the apex portion.

[0011] A second embodiment of the sheet-like material retaining pile according to the present invention is characterized in that, in the first embodiment, the locking plate portion provided in a protruding state on the circumferential surface portion is provided on the circumferential surface portion on a virtual spiral set around the axis of the pile body, with a required angular pitch around the axis.

[0012] A third embodiment of the sheet-like material retaining pile according to the present invention is characterized in that, in the second embodiment, the required angular pitch is an equal angular pitch, and the equal angular pitch is 90 degrees or 120 degrees.

[0013] A fourth aspect of the sheet-like material retaining pile according to the present invention is characterized in that, in the first aspect, the locking plate portion is provided radially protruding from the lower part of the pile body, all of the locking plate portions are at the same height from the lower end of the pile body, and the inclination angle of the upper linear inclined side of the locking plate portion with respect to the horizontal plane is set to be greater than the inclination angle of the upper linear inclined side of the locking plate portion located above the lower part of the pile body with respect to the horizontal plane.

[0014] A fifth aspect of the sheet-like material retaining pile according to the present invention is characterized in that, in the second aspect, the locking plate portion is provided radially protruding from the lower portion of the pile body, all of the locking plate portions are at the same height from the lower end of the pile body, and the angle of inclination of the upper linear inclined side portion of the locking plate portion with respect to the horizontal plane is set to be greater than the angle of inclination of the upper linear inclined side portion of the locking plate portion located above the lower portion of the pile body with respect to the horizontal plane.

[0015] A sixth aspect of the sheet-like material retaining pile according to the present invention is characterized in that, in the third aspect, the locking plate portion is provided radially protruding from the lower portion of the pile body, all of the locking plate portions are at the same height from the lower end of the pile body, and the angle of inclination of the upper linear inclined side portion of the locking plate portion with respect to the horizontal plane is set to be greater than the angle of inclination of the upper linear inclined side portion of the locking plate portion located above the lower portion of the pile body with respect to the horizontal plane.

[0016] A seventh embodiment of the sheet-like material retaining pile according to the present invention is characterized in that, in any of the first to sixth embodiments, the pile body is configured in a rod shape that gradually tapers from the upper end to the lower end.

[0017] The eighth aspect of the sheet-like object pressing pile according to the present invention is, in any of the first to sixth aspects, on the peripheral surface portion of the pile body, at a required angular pitch in the circumferential direction of the peripheral surface portion, a virtual extension line extending in the vertical direction of the peripheral surface portion is set, and the locking plate portion is protrudingly provided on the virtual extension.

[0018] The ninth aspect of the sheet-like object pressing pile according to the present invention is, in the eighth aspect, on the virtual extension line, a reinforcing rib for reinforcing the pile body is protrudingly provided, and the locking plate portion is protrudingly provided at the protruding end portion of the reinforcing rib.

Effect of the Invention

[0019] The sheet-like object pressing pile according to the present invention not only has the advantage of being easy to drive into the ground and being able to exhibit the required pulling resistance, but also has the following effects. That is, when the pile driven into the ground to press and fix the sheet-like object such as a weed control sheet to the ground is reused when replacing the sheet-like object, it can facilitate the pulling and removal of the pile from the clear hole in the sheet-like object due to the driving. Also, when small stones or the like existing in the ground become an obstacle and further pile driving becomes difficult, when driving the pile again at a different driving location, it can facilitate the pulling and removal of the pile from the clear hole in the sheet-like object due to the driving.

Brief Description of the Drawings

[0020] [Figure 1] It is a cross-sectional view showing a state where the sheet-like object pressing pile according to the present invention is driven into the ground to press and fix the sheet-like object to the ground. [Figure 2] It is a cross-sectional view of the sheet-like object pressing pile and a perspective view explaining the protruding structure of the locking plate portion on the peripheral surface portion of the pile body. [Figure 3] It is a perspective view explaining the structure of the sheet-like object pressing pile. [Figure 4] It is a perspective view explaining the structure of the sheet-like object pressing pile. [Figure 5] It is a perspective view explaining the structure of the sheet-like object pressing pile. [Figure 6] It is a perspective view for explaining the protruding state of the locking plate portion on the peripheral surface of the pile body and the configuration of the locking plate portion. [Figure 7] It is an explanatory diagram for explaining the step of pressing the sheet-like object pressing pile in a standing state by applying the lower end of the pile to a required part on the upper surface of the weed-proof sheet laid on the ground. [Figure 8] It is an explanatory diagram for explaining the driving state of the sheet-like object pressing pile by pressing. [Figure 9] It is an explanatory diagram for explaining the state where the lower end of the pile hits small stones in the ground and it becomes difficult to drive the sheet-like object pressing pile. [Figure 10] It is an explanatory diagram for explaining the step of removing the sheet-like object pressing pile from the weed-proof sheet. [Figure 11] It is an explanatory diagram for explaining the step of removing the sheet-like object pressing pile from the weed-proof sheet. [Figure 12] It is an explanatory diagram for explaining the step of removing the sheet-like object pressing pile from the weed-proof sheet. [Figure 13] It is an explanatory diagram for explaining another configuration of the locking plate portion. [Figure 14] It is an explanatory diagram for explaining another configuration of the locking plate portion.

Embodiments for Carrying Out the Invention

Examples

[0021] In Figures 1 to 6, the sheet-like material retaining pile 1 according to the present invention is used to press and fasten a sheet-like material 7 to the ground 9 by having a driving portion 5 and a sheet-like material retaining portion 6 provided at the upper end 3 of the pile body 2. Multiple locking plate portions 11 are provided on the circumferential surface portion 10 of the pile body 2 at required intervals around the axis L1 of the pile body 2 and protruding from the circumferential surface portion 10. Figure 3 is a perspective view taken in the direction of arrow A in Figure 2, Figure 4 is a perspective view taken in the direction of arrow B in Figure 2, and Figure 5 is a perspective view taken in the direction of arrow C in Figure 2. Figure 6 is a perspective view taken in the direction of arrow D in Figure 2 (a direction perpendicular to the side surface 4 of the locking plate portion 11). As shown in Figure 6, the locking plate portion 11 has a triangular plate shape with one vertex portion 12 located outward from the circumferential surface portion 10 of the pile body 2. The side portion 13 above the vertex portion 12 is an upper linear inclined side portion 15 that slopes linearly upward from the vertex portion 12 towards the upper end 14 of the side portion 13, and the side portion 16 below the vertex portion 12 is a lower inclined side portion 19 that slopes downward from the vertex portion 12 towards the lower end 17 of the side portion 16. This will be explained in detail below.

[0022] The pile body 2 is integrally molded using a synthetic resin such as polypropylene resin, ABS resin, AES resin, or polycarbonate resin. In this embodiment, as shown in Figure 1, the pile body 2 is configured in a rod shape that tapers from the upper end 3 to the lower end 31 of the pile, taking into consideration the ease of driving in the sheet-like material retaining pile 1, and the portion 20 on the lower end side of the pile is formed to be thin. Furthermore, a disc-shaped retaining plate 21 is provided at the upper end 3 of the pile body 2, aligned with the axis of the pile body 2, for pressing and securing a sheet-like material 7, such as a weed control sheet 7a, to the ground 9. The central part of the retaining plate 21 becomes the driving pressure portion 5, and the surrounding portion becomes the sheet-like material retaining portion 6. The total length of the pile body 2 is set to approximately 150 mm, the diameter of its upper end is approximately 7 mm, and the diameter of the retaining plate 21 is set to approximately 45 mm.

[0023] Furthermore, as shown in Figure 2(B), a virtual extension line L2 is set on the circumferential surface portion 10 of the pile body 2 at a required angular pitch (120 degrees in this embodiment) in the circumferential direction of the circumferential surface portion 10, extending in the vertical direction of the circumferential surface portion 10, and the locking plate portion 11 is provided projecting on the virtual extension line L2. In this embodiment, a reinforcing ridge 22 that reinforces the pile body 2 is provided projecting on the virtual extension line L2.

[0024] In this embodiment, the reinforcing protrusions 22 are provided at 120-degree angle pitches in the circumferential direction of the circumferential surface portion 10, as shown in Figure 2, and their upper ends 23 are continuous with the inner ends 27 of the reinforcing ribs 26 that protrude from the lower surface 25 of the retaining plate 21, as shown in Figures 3 to 5. The thickness of the reinforcing protrusions 22 is set to approximately 2 mm. In this embodiment, the locking plate portions 11 are provided on the extension lines of each reinforcing protrusion 22, as shown in Figures 3 to 6, and the remaining locking plate portions 11, excluding the lowest locking plate portion 11A, protrude from the protruding ends 29 of the reinforcing protrusions 22.

[0025] As described above, the locking plate portion 11 has a triangular plate shape with one vertex portion 12 located away from the circumferential surface portion 10 of the pile body 2. The side portion 13 above the vertex portion 12 is the upper linear inclined side portion 15, which slopes linearly upward from the vertex portion 12 towards the upper end 14 (Figure 6) of the side portion 13. The side portion 16 below the vertex portion 12 is the lower inclined side portion 19, which slopes downward from the vertex portion 12 towards the lower end 17 (Figure 6) of the side portion 16. The thickness of the locking plate portion 11 is equal to the thickness of the reinforcing protrusion 22, which is about 2 mm.

[0026] As shown in Figures 3 to 6, the locking plate portion 11 is provided on the lower part 30 of the pile body 2 at the same height from the lower end 31 of the pile body 2 (such as the height of the apex portion 12) along the extension of the reinforcing projection 22, and in this embodiment, the locking plate portion 11 is provided in a two-tiered stacked state. In Figure 6, the inclination angle θ1 of the upper linear inclined edge portion 15 of the upper locking plate portion 11B and the lower locking plate portion 11A with respect to the horizontal plane can be set to, for example, about 55 to 65 degrees, and in the figure it is set to about 60 degrees. In this embodiment, as shown in Figure 6, the lower inclined edge portion 19 is configured to incline linearly downward toward the lower end 32 of the edge, and the inclination angle θ2 of the linear lower inclined edge portion 19 with respect to the horizontal plane can be set to, for example, about 75 to 85 degrees, and in the figure it is set to about 80 degrees. Furthermore, the lower end 32 of the lower inclined edge 19 of the upper locking plate portion 11B is connected to the upper end 33 of the upper straight inclined edge 15 of the lower locking plate portion 11A. In this embodiment, the base ends 35, 35, 35 of the three lower locking plate portions 11A, 11A, 11A are aligned, and these aligned base ends 35, 35, 35 constitute the lower end portion 20 of the pile body (Figure 6).

[0027] Furthermore, in the upper portion 36 of the pile body 2 (the portion above the upper locking plate portion 11B), the locking plate portion 11 is provided projecting at a required angular pitch around the axis L1 on a virtual spiral 37 (Figures 3-5) set around the axis L1 of the pile body 2 on the circumferential surface portion 10 of the pile body 2. Hereinafter, this projection arrangement of the locking plate portion 11 will be referred to as a spiral arrangement. In this embodiment, the locking plate portion 11 provided in the upper portion 36 is provided with a relatively large gap between the three plates of the upper set 39 (Figures 3-5) and the three plates of the lower set 40 (Figures 3-5), and the spiral pitch of the lower set 40 is set to be larger than the spiral pitch of the upper set 39. The lower set 40 has a larger spiral pitch to reduce the resistance of the sheet-like retaining pile 1 to being driven into the ground, while the upper set 39 has a smaller spiral pitch to increase the resistance of the sheet-like retaining pile 1 to being pulled out of the ground.

[0028] In this embodiment, the locking plate portion 11 is provided projecting at an angle of 120 degrees around the axis L1 of the pile body 2, as shown in Figure 2(A). The inclination angle θ3 (Figure 6) of the upper linear inclined edge portion 15 of the locking plate portion 11 with respect to the horizontal plane can be set to, for example, about 25 to 35 degrees, and in the figure it is set to about 30 degrees. The inclination angle θ4 (Figure 6) of the lower linear inclined piece portion 19 with respect to the horizontal plane can be set to, for example, about 65 to 75 degrees, and in the figure it is set to about 70 degrees.

[0029] In the sheet-like material retaining pile 1 having the above configuration, the amount of protrusion of the locking plate portion 11 located in the lower portion 30 from the central axis L1 of the pile body 2 is set to be about 4 mm. In contrast, the amount of protrusion of the upper portion 36 from the axis L1 of the pile body 2 is set to be about 5 mm. In this embodiment, the reason for setting the protrusion amount of the upper portion 36 to be so large is to improve the resistance of the sheet-like material retaining pile 1 to coming out, as the soil is softer near the ground, and also to facilitate the driving of the sheet-like material retaining pile 1, as the soil becomes harder as you go lower from the ground.

[0030] Next, we will explain the process of driving the sheet-like material retaining stakes 1 into the ground to press down and secure the sheet-like material 7 (in the following description, a weed control sheet 7a will be used as an example) laid on the ground 9 to the ground 2.

[0031] First, as shown in Figure 7, the sheet-like retaining stake 1 is erected with its lower end 31 in contact with the required portion of the upper surface 41 of the weed control sheet 7a laid on the ground 9. In this state, the hammering portion 5 is hammered with a hammer. As described above, in this embodiment, the side portion 16 of the locking plate portion 11 that is below the apex portion 12 is a straight downward sloping side portion 19 (Figure 6) that slopes downward from the apex portion 12 towards the lower end of the side portion 16. Therefore, as the hammering continues, the lower end portion 20 of the sheet-like retaining stake 1 easily penetrates the weed control sheet 7a, forming a hole 43 (Figure 8), as shown by the dashed line in Figure 7, and is driven into the ground sequentially.

[0032] In particular, in the sheet-like material retaining pile 1 according to this embodiment, the arrangement of the locking plate portion 11, which is provided in a protruding state on the circumferential surface portion 10 of the pile body 2, is unique. Specifically, referring to Figures 3 to 5, in the upper portion 36 of the pile body 2, the locking plate portion 11 is provided in a spiral arrangement, whereas in the lower portion 30 of the pile body 2, with respect to the upper and lower sections, a plurality of the locking plate portions 11 are provided radially at the same height (the height of each portion from the lower end portion 31 of the pile is the same) at an angle pitch of 120 degrees.

[0033] As described above, since the locking plate portion 11 is radially projected from the lower portion 30, unlike when the locking plate portion 11 is projected in a spiral arrangement as described above, when the impact portion 5 is impacted, the radially arranged locking plate portion 11 restricts the direction of entry, allowing the sheet-like material retaining pile 1 to be driven into the ground in the direction of impact (a direction approximately perpendicular to the ground, etc.). Furthermore, after the sheet-like material retaining pile 1 has been driven into the ground, each of the locking plate portion 11 exerts the required pull-out resistance force. In particular, the locking plate portion 11 that is radially projected from the lower portion 30 exerts pull-out resistance force more effectively.

[0034] Furthermore, if, while driving the sheet-like retaining stake 1 into the ground, the lower end 31 of the stake hits a small stone or the like 34 in the ground, making it difficult to drive it in further (for example, the state shown in Figure 9), the driving position on the weed control sheet 7a is changed and the stake is driven in again.

[0035] When driving the stakes in again in this manner, it is necessary to temporarily remove the sheet-like retaining stakes 1, which have been driven in to some extent and are attached to the weed control sheet 7a, from the weed control sheet 7a. This removal is performed by lifting the sheet-like retaining stakes 1 up against the weed control sheet 7a.

[0036] To explain this removal process in more detail with reference to Figures 10-12, the locking plate portion 11 is triangular in shape, and as shown in Figure 6, the side portion 13 above the vertex portion 12 is an upper linear inclined side portion 15 that slopes linearly upward from the vertex portion 12 toward the upper end 14 of the side portion 13. Therefore, when the sheet-like material retaining pile 1 is lifted (this lifted state is shown by an upward arrow in Figures 10-12), the edge portion 45 (Figure 10) of the hole portion 43 (Figure 8) and the fibers 46 (Figure 11) forming the edge portion 45 slide downward toward the vertex portion 12 along the upper linear inclined side portion 15, as shown in Figures 10 and 11. This direction of movement is shown by an upward-sloping arrow in Figures 10, 11 and 12(C). As a result, the locking plate portion 11 can pass through the hole portion 43. As described above, when the locking plate portion 11 passes through the hole 43, the edge portion 45 of the hole 43 is temporarily expanded (Figure 12(D)), but after a while, the expanded state elastically returns to its original state. The hole 43 is in a somewhat expanded state after the passage of the locking plate portion 11 (Figure 12(F)).

[0037] In this embodiment, the locking plate portion 11, which is provided in a protruding state on the upper portion 36, is provided in a spiral arrangement on the circumferential portion 10 of the pile body 2, so that the vertices 12 of the locking plate portion 11 can pass through the hole 43 one by one.

[0038] If the upper edge portion 13 (Figure 6) is formed in a horizontal plane shape as described in Patent Document 1, then even if the sheet-like material retaining stake 1 is pulled out, it will not cause any sliding movement of the edge portion 45 (Figure 10) or the fibers 46 (Figure 11), and therefore, the sheet-like material retaining stake 1, which is attached to the weed control sheet 7a, cannot be removed from the weed control sheet 7a.

[0039] When a pulling force is applied to the sheet-like material retaining stake 1, whether initially driven into the ground as required or driven again to the ground as required, the upper linear inclined side 15 of the locking plate portion 11 exerts an effect of pressing and lifting the soil above it diagonally upward, as illustrated by the arrow in Figure 1. As a result, the required pulling resistance force is exerted by the locking plate portion 11, and the weed control sheet 7a can be pressed down to the ground 9 and effectively secured. When replacing the weed control sheet 7a, the sheet-like retaining stake 1 can be reused if it is not damaged. In this case, the sheet-like retaining stake 1 is removed from the weed control sheet 7a. However, even in this case, the side portion 13 of the locking plate portion 11 above the apex portion 12 is an upper linear inclined side portion 15 (Figure 6). Therefore, when the sheet-like retaining stake 1 is pulled out from the weed control sheet 7a, the edge portion 45 of the hole portion 43 to the fibers 46 (Figure 11) that form the edge portion 45 (Figure 10) slide downward along the upper linear inclined side portion 15. The edge portion 45 and the fibers 46 that have slid along the upper linear inclined side portion 15 in this way detach from the apex portion 12, and as a result, the locking plate portion 11 can pass through the hole portion 43 (Figures 10-11, Figures 12(D)(E)). As shown in Figure 12(D), when the locking plate portion 11 passes through the hole 43, the hole 43 is temporarily expanded, but after a while, the expanded state tends to return to its original elastic state. Note that the hole 43 is in a somewhat expanded state after the passage of the locking plate portion 11 (Figures 12(E) and (F)).

[0040] In particular, in this embodiment, as shown in Figures 3 to 5, the locking plate portion 11 is provided protruding from the circumferential portion 10 of the upper portion 36 in a spiral arrangement around the axis L1 of the pile body 2.

[0041] Therefore, when the sheet-like retaining stake 1 is pulled out from the weed-proof sheet 7a, the apex 12 of one locking plate portion 11 enters the hole 43 from below, and then the apex 12 of the next locking plate portion 11 in the spiral arrangement enters the hole 43 from below. As a result, the expansion of the hole 43 occurs more smoothly compared to when the apex 12s of multiple locking plate portions 11 enter the hole 43 from below simultaneously. This makes it easier to remove the locking plate portion 11 from the hole 43.

[0042] In this embodiment, the three locking plates 11, 11, 11 that protrude at a circumferential angle pitch of 120 degrees from the lower portion 30 are provided at the same height. This is because, in light of the fact that piles driven into the ground generally exhibit greater pull-out resistance at their lower end, the aim is to increase the pull-out resistance of the sheet-like material retaining pile 1 driven into the ground.

[0043] Incidentally, the fact that the three locking plate portions 11, 11, 11 are projected at a 120-degree angle pitch in the circumferential direction, and that the heights of the vertices 12, 12, 12 are the same, means that when the stake 2 is pulled out from the weed control sheet 7a, the vertices 12 of all the locking plate portions 11 pass through the hole 43 simultaneously. Therefore, at first glance, it may seem difficult to pass all the vertices 12 through the hole 43 simultaneously, but for the following reasons, they can pass through the hole 43 simultaneously without much difficulty.

[0044] First reason: In this embodiment, the locking plate portions 11, which are arranged on the circumferential surface portion 10 of the pile body 2 at an angular pitch of 120 degrees around the axis of the pile body 2, are projected on the extension line of the reinforcing protrusion 22, and above each of the locking plate portions 11, two other locking plate portions 11, 11 are arranged on the extension line. Therefore, when the locking plate portion 11 provided in the lower portion 30 passes through the hole 43, the two locking plate portions 11, 11 arranged on the upper side have already passed through the hole 43, and the hole 43 has expanded to some extent as described above. Therefore, it is easy to pass the locking plate portion 11 through the hole 43.

[0045] Second reason: The vertices 12,12,12 of the three locking plate portions 11,11,11 are at the same height, and the inclination angle θ1 of the upper linear inclined edge portion 15 of these locking plate portions 11,11,11 with respect to the horizontal plane is set to be greater than the inclination angle θ3 of the upper linear inclined edge portion 15 of the locking plate portion 11 positioned above it. Therefore, the upper linear inclined edge portion 15 with a larger inclination angle makes it easier for the edge portion 45 of the hole portion 43 and the fibers constituting the edge portion 45 to slide downward.

[0046] In this way, when using the sheet-like material retaining stake 1 according to this embodiment, it is possible to easily pull out and remove the sheet-like material retaining stake 1 that is attached to the sheet-like material 7 by being driven into the ground. The sheet-like material retaining stake 1 that has been removed from the weed control sheet (a type of sheet-like material 7) 7a is reused to press and fasten a new weed control sheet 7a to the ground 9.

[0047] Furthermore, the weed control sheet (sheet-like material) from which the sheet-like material retaining stakes 1 have been removed can be reused by appropriately repairing the holes formed after the removal of the sheet-like material retaining stakes 1 with adhesive tape. [Examples]

[0048] The present invention is by no means limited to those shown in the above embodiments, and it goes without saying that various design modifications are possible within the scope of the claims. One example is as follows.

[0049] (1) As described above, the locking plate portion 11 has a triangular plate shape with one vertex portion 12 located away from the circumferential surface portion 10 of the pile body 2. However, in addition to being a point shape, the vertex portion 12 may also be configured such as having a convex arc-shaped tip surface 47, as shown in Figure 13, or having a vertical side portion (for example, with a vertical length of about 2 mm) 49, as shown in Figure 14. When the tip surface 47 of the vertex portion 12 has a convex arc-shaped tip surface, the edge portion 45 to the fibers 46 that slide downwards from the upper linear inclined side portion 15 tend to slide along the arc-shaped surface and easily detach from the vertex portion 12.

[0050] (2) If the locking plate portion 11, which is provided in a protruding state from the circumferential surface portion 10 of the pile body 2, is provided on the circumferential surface portion 10 on a virtual spiral 37 set around the axis L1 of the pile body 2 at a required angular pitch around the axis L1, the required angular pitch may be an angle other than the 90 degrees or 120 degrees exemplified above, for example, 60 degrees, 180 degrees, etc.

[0051] (3) Multiple locking plate portions 11 that are located above the lower portion 30 of the locking plate portion 11 that is provided in a protruding state on the circumferential portion 10 of the pile body 2 may be provided protruding from the circumferential portion 10 such that the height of each portion from the lower end portion 31 of the pile body 2 is the same.

[0052] (4) The sheet-like material 7 may be a weed control sheet 7a, a disaster prevention sheet (such as a blue sheet), a light-blocking sheet, an agricultural sheet such as mulch, etc.

[0053] (5) The total length of the pile body 2 is set so as to be able to effectively fasten the sheet-like material 7 to the ground 9, and can be set to a length of, for example, 150 to 300 mm. If the length is set to be longer, the pile body 2 is made thicker accordingly.

[0054] (6) In Embodiment 1, the locking plate portion 11 is provided in a two-tiered stacked state on the lower portion 30 of the pile body 2, but the locking plate portion may be in a single tier if the required pull-out resistance force can be secured by the locking plate portion 11.

[0055] (7) The locking plate portion 11 may not be provided protruding from the protruding end portion 29 of the reinforcing projection 22, but may be provided directly protruding from the circumferential portion 10 of the pile body 2.

[0056] (8) The form of the pressing portion 5 and the sheet-like material holding portion 6 provided at the upper end of the pile body 2 is not limited to those shown in the embodiment, as long as they can press the pile body 2, which is erected on the sheet-like material 7, with the pressing portion 5 to drive it into the ground, and can press the sheet-like material 7 to the ground 9 with the sheet-like material holding portion 6 to secure it. For example, the sheet-like material holding portion 6 may be a rectangular plate in plan view that is slightly curved downwards, and its lower surface can press the sheet-like material 7 to the ground 9 to secure it. [Explanation of symbols]

[0057] 1. Sheet-like material retaining stake 2 Pile body 5. Pressing part 6. Sheet-like material holding section 7. Sheet-like material 9 ground 10 Peripheral part 11 Locking plate section 12 Vertices 13 Upper side 14 Upper edge of side 15 Upper straight inclined edge 16. The lower side 17 Lower edge of side 19 Lower sloped side 20. Lower end portion of the pile 21 Pressing plate 22 Reinforcement protrusions 29 Protruding end 30 Lower part 31 Lower end of pile 36 Upper part 43 Hole 45 Edge 46 Fibers

Claims

1. A sheet-like material retaining pile is provided with a hammering section and a sheet-like material retaining section at the upper end of the pile body, and is used to press and fasten a sheet-like material to the ground, Multiple locking plates are provided on the circumferential surface of the pile body at required intervals around the axis of the pile body and protruding from the circumferential surface. The locking plate portion has a triangular plate shape with one vertex located away from the circumferential surface of the pile body, the side portion above the vertex portion is an upper linear inclined side portion that slopes linearly upward from the vertex portion toward the upper end of the side portion, and the side portion below the vertex portion is a lower inclined side portion that slopes downward from the vertex portion toward the lower end of the side portion. When the sheet-like retaining pile, which has been driven into the ground after piercing through the sheet-like material to form a hole, is pulled up, the upper straight inclined edge portion is configured to cause the edge portion of the hole or the fibers forming the edge portion to slide toward the apex portion. The locking plate portion, which is provided in a protruding state on the circumferential surface, is characterized in that it is provided on the circumferential surface on a virtual spiral set around the axis of the pile body, with a required angular pitch around the axis.

2. The sheet-like material retaining pile according to claim 1, characterized in that the required angular pitch is an equal angular pitch, and the equal angular pitch is 90 degrees or 120 degrees.

3. A sheet-like material retaining pile, which is used to press and fasten a sheet-like material to the ground, and is provided with a hammering portion and a sheet-like material retaining portion at the upper end of the pile body, Multiple locking plates are provided on the circumferential surface of the pile body at required intervals around the axis of the pile body and protruding from the circumferential surface. The locking plate portion has a triangular plate shape with one vertex located away from the circumferential surface of the pile body, the side portion above the vertex portion is an upper linear inclined side portion that slopes linearly upward from the vertex portion toward the upper end of the side portion, and the side portion below the vertex portion is a lower inclined side portion that slopes downward from the vertex portion toward the lower end of the side portion. When the sheet-like retaining pile, which has been driven into the ground after piercing through the sheet-like material to form a hole, is pulled up, the upper straight inclined edge portion is configured to cause the edge portion of the hole or the fibers forming the edge portion to slide toward the apex portion. A sheet-like material retaining pile characterized in that the locking plate portion is provided radially on the lower part of the pile body, all of the locking plate portions are at the same height from the lower end of the pile body, and the angle of inclination of the upper linear inclined side of the locking plate portion with respect to the horizontal plane is set to be greater than the angle of inclination of the upper linear inclined side of the locking plate portion located above the lower part of the pile body with respect to the horizontal plane.

4. A sheet-like material retaining pile, which is used to press and fasten a sheet-like material to the ground, wherein the upper end of the pile body is provided with a hammering portion and a sheet-like material retaining portion, Multiple locking plates are provided on the circumferential surface of the pile body at required intervals around the axis of the pile body and protruding from the circumferential surface. The locking plate portion has a triangular plate shape with one vertex located away from the circumferential surface of the pile body, the side portion above the vertex portion is an upper linear inclined side portion that slopes linearly upward from the vertex portion toward the upper end of the side portion, and the side portion below the vertex portion is a lower inclined side portion that slopes downward from the vertex portion toward the lower end of the side portion. When the sheet-like retaining pile, which has been driven into the ground after piercing through the sheet-like material to form a hole, is pulled up, the upper straight inclined edge portion is configured to cause the edge portion of the hole or the fibers forming the edge portion to slide toward the apex portion. In the upper portion of the pile body, the locking plate portion, which is provided in a protruding state on the circumferential surface, is provided on the circumferential surface on a virtual spiral set around the axis of the pile body, with a required angular pitch around the axis. A sheet-like material retaining pile characterized in that, in the lower portion of the pile body, the locking plate portion is provided to protrude radially, all of the locking plate portions are at the same height from the lower end of the pile body, and the angle of inclination of the upper linear inclined side of the locking plate portion with respect to the horizontal plane is set to be greater than the angle of inclination of the upper linear inclined side of the locking plate portion located above the lower portion of the pile body with respect to the horizontal plane.

5. The sheet-like material retaining pile according to claim 4, characterized in that the required angular pitch is an equal angular pitch, and the equal angular pitch is 90 degrees or 120 degrees.

6. The sheet-like material retaining pile according to claim 1, characterized in that the pile body is configured in a rod shape that gradually tapers from the upper end to the lower end.

7. The sheet-like material retaining pile according to claim 1, characterized in that, on the circumferential surface of the pile body, virtual extension lines extending in the vertical direction of the circumferential surface are set at a required angular pitch in the circumferential direction of the circumferential surface, and the locking plate portion is provided protruding on the virtual extension lines.

8. The sheet-like material retaining pile according to claim 7, characterized in that a reinforcing projection for reinforcing the pile body is provided on the virtual extension line, and the locking plate portion is provided on the protruding end of the reinforcing projection.

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