JP7769184B2 - Placement block, weed control structure, and construction method for weed control structure - Google Patents

Description

The present invention relates to a mounting block, a weed control structure, and a construction method for a weed control structure.

If earthen structures such as roads and levees constructed from embankments are left unattended, weeds will grow abundantly, requiring a great deal of effort to mow them. A variety of weed-control structures have been proposed to suppress the growth of weeds on such earthen structures.

Patent Document 1 discloses a weed control structure that includes road pavement and shoulder blocks installed on the top of an earth structure, and a weed control sheet that is anchored to the shoulder blocks and covers the slope of the earth structure.

Japanese Patent Application Laid-Open No. 2005-307518

When constructing the weed control structure described in Patent Document 1, it is necessary to construct road pavement and shoulder blocks on the top of the structure, and then secure the weed control sheet to the shoulder blocks using anchors, which results in a time-consuming construction process.

The present invention was made to solve the above-mentioned problems, and aims to provide a mounting block, a weed control structure, and a construction method for a weed control structure that can be easily installed on earth structures.

The mounting block of the present invention is a mounting block that is placed on an earth structure and suppresses the growth of weeds, and comprises a rectangular plate portion and a plurality of protrusions protruding from the main surface of the plate portion, the plurality of protrusions extending in a first direction and arranged in a second direction perpendicular to the first direction, and having end protrusions provided at both ends of the plate portion in the second direction, and a plurality of intermediate protrusions provided between the end protrusions, the protrusion length of the end protrusions from the plate portion being greater than or equal to the protrusion length of the plurality of intermediate protrusions from the plate portion, and the mounting block is placed on the earth structure with the plurality of protrusions facing toward the surface of the earth structure.

The protrusion may have a tapered shape when viewed in a direction parallel to the first direction.

The intermediate protrusion may have a generally triangular shape with a truncated tip when viewed in a direction parallel to the first direction, and the apex angle may be between 45 degrees and 65 degrees .

The intermediate protrusion may have a first protrusion and a second protrusion that protrudes less from the plate portion than the first protrusion.

The earth structure may be a levee having a top and a slope, or a river embankment.

The weed control structure of the present invention comprises the above-mentioned placement block placed on the top of the earth structure, and a weed control sheet covering the slope of the earth structure , and the upper edge of the weed control sheet is clamped between the tip of the end protrusion and the top of the earth structure .

The mounting blocks may be arranged in a predetermined direction without gaps at the top of the earth structure, and may further include joints that cover the areas where the mounting blocks are adjacent to each other.

The weed control sheet may comprise a first weed control sheet laid on one of the slopes on both sides of the earth structure, and a second weed control sheet laid on the other slope, and the upper edge of the first weed control sheet and the upper edge of the second weed control sheet may be sandwiched between the tip of the end protrusion of the placement block and the top edge of the earth structure.

The construction method for a weed-control structure according to the present invention comprises the steps of laying a weed-control sheet on the slope of the earth structure, and placing the placement block on the top of the earth structure and sandwiching the weed-control sheet between the earth structure and the tip of the end protrusion .

The present invention provides a mounting block, a weed control structure, and a method for constructing a weed control structure that can be easily installed on earth structures.

1 is a perspective view of a weed control structure according to an embodiment of the present invention. FIG. 1 is a cross-sectional view of a weed control structure according to an embodiment of the present invention. FIG. 2 is a front view of the mounting block according to the embodiment of the present invention. 1A to 1B are cross-sectional views illustrating a construction method for a weed-control structure according to an embodiment of the present invention, showing construction steps ((a) to (b)). 1 is a cross-sectional view showing a state in which a mounting block according to an embodiment of the present invention is installed on a slope of an earth structure. FIG. 10 is a side view of a weed control structure according to another embodiment of the present invention. 7A and 7B are diagrams of the joint shown in FIG. 6, in which (a) is a front view and (b) is a bottom view seen from the arrow b in (a).

The following describes a mounting block, a weed control structure, and a construction method for a weed control structure according to an embodiment of the present invention, with reference to the drawings. As shown in Figures 1 and 2, the weed control structure 10 suppresses the growth of weeds on an earth structure 1 constructed from earthen fill. The earth structure 1 is, for example, a levee built in a rural area. The earth structure 1 has a top 2 and slopes 3 on both sides of the top 2. When distinguishing between the left and right slopes 3 shown in Figure 2, the left side in the figure is referred to as the first slope 3a, and the right side in the figure as the second slope 3b. Also, as shown in Figure 1, the transverse direction of the earth structure 1 is defined as the X-axis direction, the longitudinal direction of the earth structure 1 as the Y-axis direction, and the Z-axis direction perpendicular to the X-axis and Y-axis directions. The following description will refer to these directions as appropriate. The X-axis and Y-axis directions are mutually perpendicular in the horizontal direction, and the Z-axis direction coincides with the height direction.

The weed control structure 10 comprises a mounting block 20 placed on the top 2 of the earth structure 1 and weed control sheets 41, 42 laid on the slope 3 of the earth structure 1.

The mounting block 20 is a concrete product, and as shown in Figure 2, has a plate portion 21 and multiple protrusions 30 protruding from the plate portion 21. The planar shape of the mounting block 20 is, for example, a square. The mounting block 20 has a width sufficient to cover the top 2 of the earth structure 1, and the length L (Figure 1) of one side is, for example, 500 mm. The thickness t (Figure 3) of the plate portion 21 of the mounting block 20 is, for example, 60 mm.

As shown in Figure 3, the multiple protrusions 30 protrude downward from the lower surface 21a, which is one of the main surfaces of the plate portion 21. The multiple protrusions 30 include first protrusions 31, 32 that protrude a large amount, and second protrusions 33 that protrude a smaller amount than the first protrusions 31, 32.

When viewed from a direction parallel to the Y axis, the first protrusions 31, 32 have an approximately triangular protrusion 31 that is shaped like an isosceles triangle, and a trapezoidal protrusion 32 that is shaped like a trapezoid.

The approximately triangular protrusion 31 extends in the Y-axis direction, which is the first direction, and its shape and size are constant in the Y-axis direction. Three approximately triangular protrusions 31 are arranged on the mounting block 20 at intervals in the X-axis direction, which is the second direction. The approximately triangular protrusion 31 has a shape like an isosceles triangle with the base 31a aligned with the underside 21a of the plate portion 21, and the apex where the pair of equal sides 31b, 31b intersect is horizontally cut. The apex angle θ1 of the approximately triangular protrusion 31 is, for example, between 45 degrees and 65 degrees, and preferably 55 degrees. The protrusion length L1 from the plate portion 21 to the tip 31c is 50 mm. The width W1 of the tip 31c is 5 mm. The approximately triangular protrusion 31 formed in this manner has a tapered shape toward the bottom (-Z direction).

The trapezoidal protrusions 32 are provided on both ends of the plate portion 21, on the +X and -X sides. The two trapezoidal protrusions 32 are symmetrical with respect to the center line CL extending along the Y axis, so only the configuration of the trapezoidal protrusion 32 on the -X side will be described. The upper base 32a of the trapezoidal protrusion 32 coincides with the underside 21a of the plate portion 21, and the shorter lower base 32b is positioned below the upper base 32a (in the -Z direction). One leg 32c of the trapezoidal protrusion 32 coincides with an extension of the line representing the -X side end face of the plate portion 21, and the interior angle formed by leg 32c and upper base 32a is 90 degrees. The other leg 32d of the trapezoidal protrusion 32 is a hypotenuse that extends downward toward the -X side.

The trapezoidal protrusion 32 extends in the Y-axis direction, and its shape and size are constant in the Y-axis direction. The protrusion length L2 of the trapezoidal protrusion 32 from the underside 21a of the plate portion 21 to the lower base 32b is 50 mm. The width W2 of the lower base 32b of the trapezoidal protrusion 32 is 9 mm, which is larger than the width W1 (5 mm) of the tip 31c of the approximately triangular protrusion 31. As such, the first protrusions 32 provided at both ends have a wider tip width than the first protrusion 31 provided in the middle, and are therefore described as trapezoidal protrusions 32 with a different shape from the approximately triangular protrusion 31. The trapezoidal protrusion 32 formed in this manner has a shape that tapers downward (in the -Z direction).

As shown in FIG. 3, the second protrusion 33 has a substantially isosceles triangular shape when viewed from a direction parallel to the Y-axis. Specifically, the second protrusion 33 has a shape such that the base 33a of the isosceles triangle is aligned with the underside 21a of the plate portion 21, and the apex where the pair of equal sides 33b intersects is horizontally cut. The second protrusions 33 extend in the Y-axis direction and are disposed between the first protrusions 31 and 32. The shape and size of the second protrusions 33 are constant in the Y-axis direction. The apex angle θ2 of the second protrusions 33 is, for example, between 45 degrees and 65 degrees, and preferably 55 degrees. The protrusion length L3 from the underside 21a of the plate portion 21 to the tip 33c is 40 mm. The width W3 of the tip 33c in the X-axis direction is 5 mm. The second protrusions 33 thus formed have a tapered shape that tapers downward (in the -Z direction).

As described above, a trapezoidal protrusion 32 is provided at the -X side end of the plate portion 21, and second protrusions 33 and approximately triangular protrusions 31 are provided alternately on the +X side from this portion with a gap W4 between them. Furthermore, a trapezoidal protrusion 32 is provided at the +X side end of the plate portion 21. The gap W4 between each protrusion is, for example, 14 mm.

It is desirable to select weed control sheets 41, 42 from sheets that can suppress weed growth while preserving weed roots even after they are laid on the earth structure 1. For example, weed control sheets 41, 42 are made of sheets that block sunlight and allow water to pass through. Specifically, weed control sheets manufactured by Nippon Wide Cross Co., Ltd. can be used, but other sheets that have the above-mentioned functions can also be used.

As shown in Figures 1 and 2, weed control sheets 41, 42 are respectively laid on the first slope 3a and the second slope 3b provided on both sides of the earth structure 1. Weed control sheet 41, which is the first weed control sheet on the left side of the figure, covers the first slope 3a, and its upper edge 41a covers part of the top edge 2 of the earth structure 1. Weed control sheet 42, which is the second weed control sheet on the right side of the figure, covers the second slope 3b, and its upper edge 42a covers part of the top edge 2 of the earth structure 1. The upper edges 41a, 42a of the weed control sheets 41, 42 laid on both sides of the earth structure 1 are sandwiched between the trapezoidal protrusion 32 of the mounting block 20 placed on the top edge 2 and the top edge 2 of the earth structure 1. Additionally, the lower edge portions 41b, 42b of the weed control sheets 41, 42 are fixed by driving U-pins 44 inserted through washers 43 into the earth structure 1. Multiple washers 43 and U-pins 44 are provided at intervals in the Y-axis direction. By fixing the upper edge portions 41a, 42a and lower edge portions 41b, 42b of the weed control sheets 41, 42 in this way, the weed control sheets 41, 42 can be maintained covering the first slope 3a and second slope 3b.

Next, we will explain how to install the weed control structure 10.

First, as shown in Figure 4(a), weed control sheet 41 is laid to cover the first slope 3a and part of the top edge 2 on the left side of the earth structure 1, and weed control sheet 42 is laid to cover the second slope 3b and part of the top edge 2 on the right side of the figure. Weed control sheets 41, 42 are laid to the required length in the direction in which the earth structure 1 extends (Y-axis direction). If one sheet is not enough, multiple sheets are laid in the Y-axis direction, with some overlapping.

Next, the U-pin 44 inserted through the washer 43 is driven into the weed control sheets 41, 42 laid on the earth structure 1. This secures the lower edge portions 41b, 42b of the weed control sheets 41, 42 to the earth structure 1, as shown in Figure 4(b).

Next, the mounting block 20 is placed on the top 2 of the earth structure 1 with its multiple protrusions 30 facing downward. At this time, the upper edges 41a, 42a of the weed control sheets 41, 42 are sandwiched between the trapezoidal protrusions 32 provided on both the left and right ends of the mounting block 20 in the figure and the top 2 of the earth structure 1. The mounting block 20 is placed without any gaps in the direction in which the earth structure 1 extends (the Y-axis direction). This completes the construction of the weed control structure 10.

As explained above, with the weed control structure 10 according to this embodiment, the underside of the mounting block 20 is provided with the first protrusions 31, 32, which have a large protrusion amount, and the second protrusions 33, which have a small protrusion amount. This allows only the first protrusions 31, 32, which have a large protrusion amount, to penetrate into the top edge 2 of the earth structure 1. As a result, as shown in FIG. 2, a space 50 in which weeds can grow is secured between the mounting block 20 and the top edge 2 of the earth structure 1. Meanwhile, external light is blocked by the mounting block 20 and does not enter the space 50. This suppresses weed growth while leaving the roots of the weeds intact. This prevents the soil of the earth structure 1 from eroding and the earth structure 1 from collapsing.

Furthermore, by cutting the tips of the multiple protrusions 30 horizontally, it is easy to ensure a sufficient contact area for the mounting block 20. This allows only a portion of the multiple protrusions 30 to penetrate into the earth structure 1, making it easy to ensure a space 50 in which weeds can grow.

Furthermore, the trapezoidal protrusions 32, which are provided on both ends of the +X and -X sides of the mounting block 20 and have a width W2 wider than widths W1 and W3, allow the weed control sheets 41, 42 laid on the earth structure 1 to be sandwiched between the top edge 2, and the upper edge portions 41a, 42a of the weed control sheets 41, 42 can be easily fixed in place. This makes it easy to install the weed control structure 10.

In addition, the protrusion amount of the trapezoidal protrusion 32 is made greater than the protrusion amount of the second protrusion 33, increasing the force with which the trapezoidal protrusion 32 presses against the top edge 2. This allows the upper edge portions 41a, 42a of the weed control sheets 41, 42 to be securely fixed to the earth structure 1.

In addition, the weed control sheets 41, 42 are selected from sheet materials that can suppress weed growth while leaving weed roots intact even after being laid on the earth structure 1. This prevents the soil of the earth structure 1 from eroding and the earth structure 1 from collapsing.

The mounting block 20 has planar dimensions of 500 mm x 500 mm and can be carried by one person or a small group of people. This makes it easy to set up the mounting block 20.

This invention is not limited to the above-described embodiment and is susceptible to various modifications and applications. In the above-described embodiment, three triangular protrusions 31 and four second protrusions 33 are arranged in the transverse direction of the mounting block 20. However, the number of these protrusions 30 is not particularly limited. Furthermore, the dimensions of the protrusions 30 are not limited to the above-described dimensions. For example, the protrusion lengths L1, L2, and L3 of the first protrusions 31, 32 and the second protrusions 33 may be changed to increase or decrease the difference between the protrusion lengths of the first protrusions 31, 32 and the second protrusions 33. Furthermore, the number of protrusions 30 may be increased or decreased compared to the above-described embodiment, thereby changing the size of the gap W4 between the protrusions, or a configuration without a gap W4 may be employed. Furthermore, the widths W1, W2, and W3 of the tips of the protrusions 30 may be increased or decreased relative to the aforementioned dimensions. Alternatively, the widths W1, W2, and W3 may be set to zero, resulting in sharpened tips of the protrusions 30. The narrower the width W2, the more the trapezoidal protrusion 32 becomes a right-angled triangle. On the other hand, the wider the widths W1 and W3, the more the first protrusion 31 and second protrusion 33 become trapezoidal.

For example, the protrusion length L3 of the second protrusion 33 may be set to 25 mm, which is smaller than in the above embodiment, thereby increasing the difference between the protrusion lengths L1 and L2 of the first protrusions 31 and 32. Alternatively, the protrusion length L3 of the second protrusion 33 may be set to a smaller value, such as 25 mm, and the number of approximately triangular protrusions 31 may be reduced to two rows and the number of second protrusions 33 may be reduced to three rows, thereby increasing the gap W4 between the multiple protrusions 30 (e.g., 40 mm). Alternatively, the protrusion lengths L1, L2, and L3 of each protrusion 31, 32, and 33 may be set to the same as in the above embodiment, and the number of approximately triangular protrusions 31 may be reduced to two rows and the number of second protrusions 33 may be reduced to three rows, thereby increasing the gap W4 between the multiple protrusions 30 (e.g., 34 mm). While the apex angles θ1 and θ2 of the multiple protrusions 30 have been described as being between 45 degrees and 65 degrees, for example, they may be set to angles outside this range depending on the installation location.

Furthermore, the planar dimensions of the mounting block 20 are not limited to 500 mm x 500 mm and can be changed as appropriate to match the size of the earth structure 1 to be installed. The planar shape is also not limited to a square and may be rectangular. By further increasing the planar dimensions, reinforcing steel bars may be provided on the mounting block 20.

Joint material may also be applied between adjacent mounting blocks 20. This will prevent weeds from growing between the adjacent mounting blocks 20.

In addition, while we have explained that the lower edge portions 41b, 42b of the weed control sheets 41, 42 are fixed to the earth structure 1 using washers 43 and U-pins 44, other fixing methods may also be used. For example, they may be fixed using nail-shaped fixing devices or anchor pins, or weights may be attached to the lower edge portions 41b, 42b to prevent them from lifting up.

In addition, while we have described a form in which separate weed control sheets 41, 42 are laid on the first slope 3a and second slope 3b on both sides of the earth structure 1, it is also possible to lay a weed control sheet that covers the entire first slope 3a, top edge 2, and second slope 3b. This allows a weed control sheet to be laid below the mounting block 20 as well.

While the above embodiment describes the earth structure 1 on which the weed control structure 10 is installed as a rice levee, it may also be installed on other earth structures, such as the top of a river embankment, a park, a school, a golf course, or private land (for approaches). Alternatively, the mounting blocks 20 may be installed not only on the top 2 of the earth structure 1, but also on the slope of a rice levee, the slope of a river embankment, or the slope of a road. For example, Figure 5 shows a road 80 on which pavement 60 and pavement stop blocks 70 have been constructed on the top 2 of the earth structure 1, which is an embankment. The pavement stop blocks 70 are installed on the edge of the top 2 of the earth structure 1, and the mounting blocks 20 are placed on the slope 3 of the earth structure 1 without leaving any gaps between them. In this case, the mounting blocks 20 are installed on the slope 3 with the extension direction of the multiple protrusions 30 aligned with the extension direction of the earth structure 1, which is an embankment. This allows the multiple protrusions 30 to dig into the slope 3, preventing the mounting blocks 20 from slipping off the slope 3. Even if the mounting blocks 20 are installed on the slope 3 of a levee or the like, the growth of weeds on the slope 3 can be suppressed for the same reasons as described above. The mounting blocks 20 do not need to cover the entire slope 3, and may be installed only near the pavement 60 where weed growth is desired to be suppressed. For example, although the mounting blocks 20 are installed in two rows in Figure 5, the number of rows in which the mounting blocks 20 can be installed is arbitrary.

Furthermore, the mounting block 20 is not limited to being made of concrete, and may be made of other materials. For example, the mounting block 20 may be made of steel, synthetic resin, or rubber.

While the above embodiment differs in the protrusion length of the first protrusions 31, 32 from the protrusion length of the second protrusion 33, the protrusion amounts may be the same. Even in this case, by ensuring a sufficient protrusion amount for each protrusion 31, 32, 33, it is possible to allow only a portion (the tip side) of the protrusions 31, 32, 33 to penetrate into the top 2 of the earth structure 1. This allows for a space 50 in which weeds can grow between the mounting block 20 and the top 2 of the earth structure 1, as in the case shown in Figure 2. Alternatively, the protrusions sandwiched between the trapezoidal protrusions 32 on both sides of the mounting block 20 (in the above embodiment, the approximately triangular protrusions 31 and the second protrusions 33) may be of any protrusion amount as long as it does not exceed the protrusion amount of the trapezoidal protrusions 32. The protrusions sandwiched between the trapezoidal protrusions 32 may all be of the same protrusion amount, smaller than the trapezoidal protrusions 32, or may be of different protrusion amounts. In this way, by not exceeding the protrusion amount of the trapezoidal protrusion 32, it is possible to easily sandwich the weed control sheet 42 between the trapezoidal protrusion 32 and the top edge 2 of the earth structure 1.

In addition, in the above embodiment, construction of the weed control structure 10 was completed by arranging the mounting blocks 20 without any gaps in the extension direction of the earth structure 1 (Y-axis direction), but this process may be further supplemented by a step of attaching joints connecting adjacent mounting blocks. Below, a weed control structure 150 according to another example of this embodiment will be described with reference to Figures 6, 7(a), and 7(b). As shown in Figure 6, the weed control structure 150 has joints 100 attached to adjacent mounting blocks 120 to suppress the growth of weeds between the mounting blocks 120.

As shown in Figure 6, two grooves 110a and 110b extending in the X-axis direction are formed on the top surface of the mounting block 120. Grooves 110a and 110b are parallel to each other. When viewing the mounting block 120 from above, groove 110a is formed near the edge on the +Y side of the mounting block 120, and groove 110b is formed near the edge on the -Y side of the mounting block 120. Grooves 110a and 110b are formed across the entire width of the mounting block 120 in the X-axis direction. When grooves 110a and 110b are cut perpendicular to the longitudinal direction (X-axis direction), the cross section is rectangular, and the shape and size are consistent in the X-axis direction.

The joint 100 is made of rubber and has an insertion part 101 that is inserted into the groove 110b, an insertion part 102 that is inserted into the groove 110a, and a connection part 103 that connects the insertion parts 101 and 102.

As shown in Figure 7(a), the insertion portion 101 protrudes downward from the underside of the connection portion 103. As shown in Figure 7(b), the insertion portion 101 extends in the X-axis direction, and its length in the X-axis direction is the same as the width of the mounting block 120 in the X-axis direction. As shown in Figure 7(a), the insertion portion 101 has multiple protrusions 104 protruding from the side surface on the +Y side. The protrusions 104 are inclined diagonally upward (with their tips tilted toward the +Z side from a state parallel to the Y axis (horizontal)). The insertion portion 101 also has multiple protrusions 105 protruding from the side surface on the -Y side. The protrusions 105 are inclined diagonally upward (with their tips tilted toward the +Z side from a state parallel to the Y axis (horizontal)). When the insertion portion 101 is inserted into the groove 110a, the protrusions 104 and 105 come into contact with the inner wall of the groove 110a. Even if a force acts on the insertion portion 101 in this state to pull it out of the groove 110a, the protrusions 104 and 105 come into contact with the inner wall of the groove 110a, resisting the pull-out from the groove 110a. In this way, the protrusions 104 and 105 prevent the inserted insertion portion 101 from easily pulling out of the groove 110a. The insertion portion 102 has the same configuration as the insertion portion 101 and also has the protrusions 104 and 105.

The connection portion 103 is a sheet-like member that connects the insertion portion 101 and the insertion portion 102. The connection portion 103 covers the space between adjacent mounting blocks 120, blocking sunlight and suppressing the growth of weeds. The connection portion 103 has an expandable portion 103a in its center that extends in the X-axis direction. As shown in Figure 7(a), the expandable portion 103a has a downwardly convex V-shape when viewed parallel to the X-axis direction, and is formed with the same shape in the X-axis direction. The expandable portion 103a is formed at a position corresponding to the boundary between adjacent mounting blocks 120. As a result, even if the gap between adjacent mounting blocks 120 widens, the expandable portion 103a expands to follow the displacement of the mounting block 120, preventing the joint 100 from coming off the mounting block 120. Note that the expandable portion 103a is not limited to this shape and may, for example, have an upwardly convex, arch-like shape.

In this way, by attaching the joints 100 to the locations where the mounting blocks 120 are adjacent to each other, sunlight can be blocked and weeds can be prevented from growing between the mounting blocks 120. The joints 100 can also be attached and detached by inserting and removing the insertion portions 101, 102 into the grooves 110a, 110b. This makes it easy to repair the weed control structure 150 by removing the joints 100 and then attaching the new joints after the repairs are complete.

Note that, while the attachment/detachment means for the joint 100 has been described using grooves 110a and 110b and insertion portions 101 and 102 that are inserted into grooves 110a and 110b as an example, the attachment/detachment means is not limited to this. For example, the attachment/detachment means may be such that multiple columnar protrusions are formed on the joint 100 and these protrusions are inserted into the grooves 110a and 110b for attachment, or holes corresponding to the columnar protrusions are formed in the mounting block 120 and the columnar protrusions are fitted into the holes to attach the joint 100.

The present disclosure allows for various embodiments and modifications without departing from the broad spirit and scope of the present disclosure. Furthermore, the above-described embodiments are intended to explain the present disclosure and do not limit the scope of the present disclosure. In other words, the scope of the present disclosure is defined by the claims, not the embodiments. Various modifications made within the scope of the claims and the meaning of equivalent disclosures are deemed to be within the scope of the present disclosure.

1: Earth structure, 2: Top edge, 3: Slope, 3a: First slope, 3b: Second slope, 10: Weed control structure, 20: Mounting block, 21: Plate portion, 21a: Underside, 30: Multiple protrusions, 31: First protrusion (approximately triangular protrusion), 31a: Base, 31b: Equal sides, 31c: Tip, 32: First protrusion (trapezoidal protrusion), 32a: Upper base, 32b: Lower base, 32c, 32d: Legs, 33: Second protrusion, 33a: Base, 33b: Equal sides, 33c: Tip, 41: Weed control sheet, 41a: Upper edge, 41b: Lower edge 42: Weed control sheet, 42a: Upper edge, 42b: Lower edge, 43: Washer, 44: U-pin, 50: Space, 60: Pavement, 70: Pavement stop block, 80: Road, 100: Joint, 101, 102: Insertion section, 103: Connection section, 103a: Expandable section, 104, 105: Protrusion, 110a, 110b: Groove, 120: Mounting block, 150: Weed control structure, θ1, θ2: Apex angle, L: Side length, L1, L2, L3: Protrusion length, CL: Center line, W1, W2, W3: Width, W4: Gap, t: Thickness

Claims (9)

A mounting block that is placed on an earth structure and suppresses the growth of weeds,
a rectangular plate portion;
a plurality of protrusions protruding from the main surface of the plate portion;
the plurality of protrusions extend in a first direction and are arranged in a second direction perpendicular to the first direction, and have end protrusions provided at both ends of the plate portion in the second direction, and a plurality of intermediate protrusions provided between the end protrusions;
a protruding length of the end protrusion from the plate portion is equal to or greater than a protruding length of the plurality of intermediate protrusions from the plate portion;
The earth structure is placed on the earth structure with the plurality of protrusions facing the surface of the earth structure.
Mounting block. The protrusion has a tapered shape when viewed in a direction parallel to the first direction.
The mounting block according to claim 1 . When viewed from a direction parallel to the first direction, the intermediate protrusion has a generally triangular shape with a truncated tip, and the apex angle is equal to or greater than 45 degrees and equal to or less than 65 degrees.
The mounting block according to claim 1 . The intermediate protrusion has a first protrusion and a second protrusion that protrudes less from the plate portion than the first protrusion.
The mounting block according to claim 1 . The earth structure is a levee or a river bank having a top and a slope.
The mounting block according to claim 1 . The block according to any one of claims 1 to 5, which is placed on the top of the earth structure;
a weed control sheet covering the slope of the earth structure ,
The upper edge of the weed control sheet is sandwiched between the tip of the end protrusion and the top edge of the earth structure .
Weed control structure. The placing blocks are arranged without gaps in a predetermined direction at the top of the earth structure,
The mounting blocks further include a joint that covers the area where the mounting blocks are adjacent to each other.
The weed control structure according to claim 6. The weed control sheet includes a first weed control sheet laid on one of the slopes on both sides of the earth structure, and a second weed control sheet laid on the other slope,
the upper edge of the first weed control sheet and the upper edge of the second weed control sheet are sandwiched between the tip of the end protrusion of the mounting block and the top edge of the earth structure;
The weed control structure according to claim 6. laying a weed control sheet on a slope of the earth structure;
and placing the placement block according to any one of claims 1 to 5 on the top end of the earth structure and sandwiching the weed control sheet between the earth structure and the tip of the end protrusion .
How to construct weed control structures.