JP7341039B2 - Weed germination prevention structure and its installation method, and weed germination prevention sheet - Google Patents

Description

The present invention relates to a weed germination prevention structure, a method for installing the same, and a weed germination prevention sheet.

As part of road maintenance work, weeding is carried out to remove weeds that grow at the boundaries (joints) between the paved surfaces of roads and sidewalks and the concrete blocks of curbs and median strips. If weeding is neglected, it may obstruct the driver's view, and during rainy weather, it may also prevent water from draining quickly into roadside drainage ditches. Since these can cause traffic accidents, weeding work is indispensable, but there is a problem in that it is costly.

In order to solve the above problem, Patent Document 1 proposes a weed suppression tape in which an adhesive layer is laminated on a resin film. If soil, sand, dust, etc. accumulate in the gaps between the paved surface and other structures, and where weeds can grow, weed suppression tape can be applied to cover these areas to prevent weeds from growing. It is said that

Japanese Patent Application Publication No. 2005-210906

However, the weed suppression tape of Patent Document 1 has the following problems. The surface to be pasted is not necessarily a smooth surface, but may be a rough surface with irregularities of about 2 to 5 mm, for example. Weed control tape cannot follow the complex surface shape of such a rough surface, so it is difficult to apply it. Moreover, even if it is possible to stick it, sufficient adhesive force cannot be obtained because the actual adhesion area is small. Furthermore, although adhesion using an acrylic pressure-sensitive adhesive layer has been proposed, the weather resistance in an outdoor environment exposed to wind, rain and direct sunlight throughout the seasons is not necessarily satisfactory.

The present invention provides a weed germination prevention structure that can be easily fixed to the boundary between a road paved surface and other structures and has excellent weather resistance, a method for installing the same, and a weed germination prevention sheet.

[1] A weed germination prevention structure installed at the boundary between the paved surface of a road and other structures, the weed germination prevention structure comprising a primer layer, a base treatment material made of hardening silicone, and A weed germination prevention structure characterized by being at least one sheet selected from sheets made of hardened silicone.
[2] A retention area is formed at the boundary, and the retention area consists of grooves, depressions, steps, gaps, or joints in which dirt and dust can accumulate, and the retention area and the surface surrounding it are asphalt surfaces. The weed germination prevention structure according to [1], comprising a concrete surface or a mortar surface.
[3] The weed germination prevention structure according to [1], wherein at least one of the base treatment material and the sheet contains a light blocking material.
[4] The weed germination prevention structure according to any one of [1] to [3], wherein at least one of the base treatment material and the sheet has a total light transmittance of 30% or less.
[5] The weed germination prevention structure according to any one of [1] to [4], wherein at least one of the base treatment material and the sheet is black or gray.
[6] The weed germination prevention structure according to any one of [1] to [5], wherein the other structure is a curb or a pillar.
[7] The weed germination prevention structure according to any one of [1] to [6], wherein at least one of the base treatment material and the sheet contains a germination inhibitor or a herbicide.
[8] A method for installing a weed germination prevention structure in a retention area at the boundary between the paved surface of a road and other structures, wherein the retention area is a groove, depression, step, or gap where dirt can accumulate. or a step of cleaning the surface of the asphalt surface, concrete surface, or mortar surface that constitutes the retention area and its surroundings, and a step of forming a primer layer by applying a primer agent to the surface and drying it. a step of forming a base treatment material by applying a paste made of uncured silicone to the retention area where the primer layer is formed and filling at least a portion of the retention area; A method for installing a structure for preventing weed germination, comprising the step of applying a sheet made of uncured silicone to cover at least a portion of a primer layer.
[9] The method for installing a weed germination prevention structure according to [8], wherein the amount of the primer applied is 100 g/m ² to 500 g/m ² .
[10] The method for installing a weed germination prevention structure according to [8] or [9], wherein the area to which the primer is applied is curved or bent when the paved surface is viewed from above.
[11] A sheet made of uncured curable silicone, which is used in the method for installing a weed germination prevention structure according to any one of [8] to [10], in which at least the base treatment material and the primer layer are A weed germination prevention sheet used for partially covering purposes.
[X] A weed germination prevention structure installed in a retention area at the boundary between the paved surface of a road and other structures, where the retention area is a groove, depression, step, gap, or groove where dirt can accumulate. a primer layer formed on the surface of the asphalt surface, concrete surface, or mortar surface, which consists of joints and constitutes the retention area and its surroundings; and a curable silicone that is in contact with the primer layer and fills at least a portion of the retention area. 1. A structure for preventing weed germination, comprising: a base treatment material made of the following: and a sheet made of curable silicone that covers at least a portion of the base treatment material and the primer layer.

According to the weed germination prevention structure of the present invention, if at least a portion of the retention area is filled with a base treatment material and is further covered with a sheet made of curable silicone (weed germination prevention sheet), it becomes difficult for dirt to accumulate in the retention area. , the environment becomes unsuitable for weed germination, and weed germination can be prevented. The surface treatment material can almost completely follow the surface even if it is installed on a rough surface. Further, the base treatment material can fill in the rough surface and form a relatively smooth surface. Furthermore, the weed germination prevention sheet placed so as to cover the base treatment material has excellent adhesion to the base treatment material, which is also made of curable silicone. As a result, the weed germination prevention structure of the present invention is sufficiently fixed to the retention area.
In addition, if the weed germination prevention structure of the present invention is provided with a base treatment material and sheet made of curable silicone with excellent weather resistance, they will have sufficient thickness and will have good adhesion to the installation surface. It is stable and highly resistant to changes in temperature and humidity, so it can exhibit excellent weather resistance.
According to the method for installing a weed germination prevention structure of the present invention, a weed germination prevention structure that exhibits the above-mentioned excellent effects can be easily formed.

It is a perspective view showing an example of how weed germination prevention structures are installed in two places. 2 is a sectional view taken along line XX in FIG. 1. FIG. FIG. 2 is an example of a partially enlarged cross-sectional view of the weed germination prevention structure 10A of FIG. 1. FIG. 2 is an example of a partially enlarged cross-sectional view of the weed germination prevention structure 10B of FIG. 1. FIG. FIG. 2 is a perspective view showing an example of a curb and a paved surface before installing a weed germination prevention structure. FIG. 2 is a perspective view showing an example of how weeds germinate and grow from a retention area at the boundary between a curb and a paved surface without installing a weed germination prevention structure.

《Weed germination prevention structure》
A first aspect of the present invention is a weed germination prevention structure installed in a retention area at the boundary between the paved surface of a road and other structures.
The weed germination prevention structure of this embodiment is at least one selected from a primer layer, a base treatment material made of curable silicone, and a sheet made of curable silicone.

Hereinafter, preferred embodiments of the present invention will be illustrated with reference to the drawings.
1 to 4 depict a paved surface 1 of a roadway, a curb 2, and a paved surface 3 of a sidewalk.
The paved surfaces of roads such as driveways and sidewalks are made of asphalt, concrete, or mortar. Here, an asphalt surface means a surface containing asphalt, a concrete surface means a surface containing concrete, and a mortar surface means a surface containing mortar. A concrete surface is also a mortar surface, but it differs from a mortar surface in that it contains coarse aggregate.
Both the side surface 2a and the top surface 2b of the curb 2 are made of concrete.

At the boundary between a paved surface 1 and a curb 2 of a roadway, a side surface 2a of the curb 2 stands up from the paved surface 1. Along the boundary between the paved surface 1 and the side surface 2a, there is a retention area A consisting of a depression where dirt can accumulate. Further, along the boundary between the pavement surface 3 of the sidewalk and the upper surface 2b of the curb 2, there is a retention section B consisting of a groove in which dirt can accumulate.

1 and 2 show how a weed germination prevention structure 10A covering the retention section A and a weed germination prevention structure 10B covering the retention section B are installed.
3 and 4 show examples of partially enlarged cross-sectional views of the weed germination prevention structures 10A and 10B.

[Primer layer 4]
The asphalt and concrete surfaces constituting the retention areas A and B and their surroundings are clean surfaces from which dirt and the like have been removed in advance, and these surfaces are coated with a primer layer 4.

The primer layer 4 is a surface modification layer for improving the adhesion of the base treatment material and the weed germination prevention sheet to the retention area, and is a hardened layer formed by applying a commercially available primer to the surface and drying it.
The thickness of the primer layer 4 is preferably 0.05 mm to 1 mm, more preferably 0.1 mm to 0.5 mm, and even more preferably 0.15 mm to 0.3 mm.
Within the above range, the adhesiveness of the base treatment material and weed germination prevention sheet can be further improved. The preferred thickness of the primer layer illustrated herein is greater than the thickness of the primer layer used in typical adhesive applications. Since the paved surface of the road on which the primer layer 4 is formed is rougher than a general adhesive surface (for example, the surface of a tile or roof tile), the thicker the primer layer, the easier it is to obtain strong adhesion.

A specific example of a primer agent suitable for forming the primer layer 4 includes Primer MT manufactured by Shin-Etsu Chemical Co., Ltd., and the like.

[Surface treatment material 5]
A base treatment material 5 made of curable silicone is installed in each of the retention areas A and B.
The base treatment material 5 is a paste-like silicone in the uncured stage, and is an elastic member that is applied so as to fill at least part of the depressions and grooves in the retention areas A and B, and then hardened. It is firmly adhered to the retention parts A and B via the formed primer layer 4. Since the surface treatment material 5 fills the depressions and grooves of the retention areas A and B, the surface of the surface treatment material 5 can be a relatively smooth surface.
The thickness of the base treatment material 5 is preferably such that it can fill the retention areas A and B, for example, preferably 1 mm to 20 mm, more preferably 5 mm to 10 mm. Here, the thickness of the base treatment material 5 is the average value of the thicknesses measured in the upward direction from the paved surface 1 at five randomly selected locations.
The length of the base treatment material 5 in the longitudinal direction is appropriately set depending on the lengths of the retention portions A and B, and can be, for example, 10 cm to 1000 cm. The base treatment material 5 may be installed in a continuous manner, or may be divided in the middle and installed in a plurality of pieces. Note that if the unevenness of the retention portion is 5 mm or less, the structure may not include a base treatment material.

The curable silicone forming the base treatment material 5 may be a condensation curing type or an addition curing type. Addition-curing types are stored at low temperatures when unused, and cured by heating above room temperature when used. The condensation-curing type is stored in a dry environment (moisture-proof environment) when not in use, and is cured by absorbing moisture from the air when in use. From the viewpoint of ease of construction, condensation-curing silicone is preferred.

Curable silicone can be molded into a desired shape when uncured and retains its shape after curing. The uncured William plasticity (25° C.) of the curable silicone used for installing the base treatment material 5 is preferably 5 to 45, more preferably 5 to 30. When the William plasticity is within the above range, it has fluidity in an uncured state and can be easily molded into a desired shape.
Here, the William plasticity is a value measured and calculated according to JIS K 6249:1997, "Testing method for uncured and cured silicone rubber." That is, prepare a roughly spherical test piece of 2 g of silicone rubber that cures at 25°C, sandwich this test piece between cellophane paper, and use a parallel plate plasticity meter with a dial gauge ("William Plus and Meter" manufactured by Ueshima Seisakusho). After setting the test piece in the test piece, applying a load of 5 kg and leaving it for 3 minutes, read the scale of the dial gauge in millimeters, record the thickness of the test piece, and multiply this value by 100.

From the viewpoint of improving the weather resistance of the weed germination prevention structure, the hardness after curing of the curable silicone rubber constituting the base treatment material 5 is set to "Part 3: Durometer hardness (Type A)" of JIS K 6253:2012. When evaluated based on this, it is preferable that A is 40 or more. The upper limit is not particularly limited, but considering that when the shape of the retention parts A and B changes due to aging deterioration (for example, road surface subsidence due to traffic, earthquakes, etc.), the base treatment material 5 will follow the change. For example, the upper limit may be about A90.

An uncured silicone paste, which is a suitable curable silicone exhibiting William plasticity and hardness suitable for the base treatment material 5, can be produced by a known method.

[Sheet 6]
At least a portion of the base treatment material 5 and primer layer 4 provided in each retention section is covered with a sheet (weed germination prevention sheet) 6 made of curable silicone. Since the surface of the sheet 6 covering each retention portion is smooth, dirt and rainwater can be prevented from accumulating on the surface of the sheet 6.

The sheet 6 is an elastic member that is formed into a sheet shape in an uncured state, is attached to cover the base treatment material 5 and the primer layer 4, and is then cured. It is preferable that the sheet 6 covers the entire base treatment material 5 and is further in contact with the primer layer 4 in an exposed area not covered by the base treatment material 5. With this structure, the adhesive area of the sheet 6 becomes large, so that the sheet 6 is strongly fixed. In addition, with this structure, the entire outer surface of the weed germination prevention structure is covered with the smooth surface of the sheet 6, making it difficult for dirt and rainwater to accumulate, making it possible to reliably prevent weed germination.
In order to obtain the above-mentioned preferable structure, as shown in FIG. 1, when weed germination prevention structures 10A and 10B are viewed from above, the relationship is: area of primer layer 4>area of sheet 6>area of base treatment material 5. It is preferable that

The thickness of the sheet 6 is preferably a thickness that can withstand being exposed to wind and rain or being hit by stones flying from a car, for example, preferably 0.5 mm to 8 mm, more preferably 1 mm to 6 mm, More preferably 2 mm to 4 mm. Here, the thickness of the sheet 6 is the average value of the thicknesses of the cross sections measured at five randomly selected locations.
The vertical and horizontal lengths of the sheet 6 are appropriately set depending on the areas of the retention portions A and B, and can be, for example, 1 cm to 10 cm in the vertical direction and 10 cm to 1000 cm in the horizontal direction. The sheet 6 may be installed as one continuous sheet, or may be divided in the middle and divided into a plurality of sheets.

The curable silicone forming the sheet 6 may be a condensation-curing type or an addition-curing type. From the viewpoint of ease of construction, condensation-curing silicone is preferred.
The uncured William plasticity (25° C.) of the curable silicone constituting the sheet 6 is preferably 50 to 450, more preferably 50 to 300. When the William plasticity is within the above range, it is easy to apply the base treatment material 5 along the shape of the base treatment material 5 in an uncured state. Here, the William plasticity is a value determined by the method described above.
If the William plasticity is equal to or higher than the lower limit, the sheet shape can be maintained sufficiently, and if it is equal to or lower than the upper limit, it can be easily adapted to the installation location.

From the perspective of improving the weather resistance of the weed germination prevention structure, the hardness of the cured silicone rubber constituting the sheet 6 was determined based on "Part 3: Durometer hardness (Type A)" of JIS K 6253:2012. When evaluated, it is preferably A40 or higher. The upper limit is not particularly limited, but considering that when the shape of the retention parts A and B changes due to aging deterioration (for example, ground subsidence due to traffic, earthquakes, etc.), the base treatment material 5 will follow the change, For example, the upper limit may be about A90.

As a sheet of uncured silicone that is a suitable curable silicone exhibiting William plasticity and hardness suitable for the sheet 6, for example, HR-2388S (Additional Curing type, room temperature curing), HR-120S (addition curing type, heat curing), HR-120NP (addition curing type, heat curing), HJ-14S (condensation curing type), HJ-1588L (condensation curing type), Polymer Ace Examples include PA.

[Light blocking material]
At least one of the base treatment material 5 and the sheet 6 that constitute the weed germination prevention structures 10A and 10B may contain a light blocking material. If a light blocking material is included, it will prevent sunlight from passing through the weed germination prevention structure, and even if there are weed seeds or rhizomes remaining in retention areas A and B, weeds will not germinate from them. can be more reliably prevented. Note that even if the weed germination prevention structure does not contain a light shielding material, since the weed germination prevention structure covers the retention area, it is possible to physically prevent the germination and growth of weeds in the retention area.
The light shielding material is a substance that scatters, reflects, or absorbs sunlight. Specific examples include fine particles of metals, carbon materials, dyes, pigments, and the like. It is preferable that the light shielding material is uniformly dispersed in the base treatment material 5 and the sheet 6.

[Total light transmittance]
From the viewpoint of blocking sunlight for the above-mentioned purpose, the total light transmittance of at least one of the base treatment material 5 and the sheet 6 is preferably 30% or less, more preferably 20% or less, and even more preferably 10% or less. Of course, it may be 0%.
Here, the total light transmittance of the above member is the illuminance LX1 of the white light received by the light sensor when the light sensor of the illumination meter is covered with each member, and the luminance LX1 of the white light received by the light sensor when the light sensor is not covered with each member. This is calculated from the ratio of the white light received by the sensor to the illuminance LX2 (LX1/LX2×100%).

[color]
From the viewpoint of blocking sunlight for the above-mentioned purpose, it is preferable that at least one of the base treatment material 5 and the sheet 6 is black or gray. Note that the colors of the base treatment material 5 and the sheet 6 can be adjusted by the colors and amounts of the dyes and pigments contained in these members. For example, a black silicone member can be obtained by blending a carbon material such as carbon black.

[Sprouting inhibitor, weed control agent]
At least one of the base treatment material 5 and the sheet 6 constituting the weed germination prevention structures 10A and 10B may contain a germination inhibitor or a herbicide. By diffusing the germination inhibitor or herbicide from the substrate treatment material 5 or sheet 6 to the surrounding area, even if weed seeds or rhizomes remain in the retention areas A and B, weeds will not germinate from them. can be more reliably prevented. As the germination inhibitor or herbicide, commercially available products used against weeds are used. The content of the germination inhibitor or herbicide based on the total mass of the substrate treatment material 5 can be, for example, about 0.1 to 5% by mass. The content of the germination inhibitor or herbicide relative to the total mass of the sheet 6 can also be the same.

[Other embodiments]
In the above explanation, the case where the "other structure" is a curb separating the roadway and the sidewalk is illustrated, but the "other structure" of the present invention is not limited to this example, and includes a boundary forming a median strip. It may be a block, a concrete block constituting a U-shaped groove, a utility pole, a wall, or the like.
In addition, in the above explanation, the case where the "retention part" is a groove or a depression is illustrated, but the "retention part" of the present invention is not limited to this example, and includes steps, gaps, and joints of several millimeters to several centimeters. etc. may be used.

《How to install a weed germination prevention structure》
A second aspect of the present invention is a method of installing the weed germination prevention structure of the first aspect in a retention area at the boundary between the paved surface of a road and other structures, and which includes at least the following steps A to D. has.

[Process A]
Step A is a step of cleaning the asphalt surface, concrete surface, or mortar surface constituting the retention part and its surroundings. Figure 4 shows the appearance of the retention areas A and B before cleaning. Since no weed germination prevention structure is installed, weeds G germinate and grow from retention areas A and B located at the boundaries between the curb 2 and the paved surfaces 1 and 3. FIG. 3 shows the state after the weeds were cut and the dirt accumulated in the retention area A was scraped out with a broom or brush to make the retention areas A and B and their surroundings clean.

[Process B]
Step B is a step in which a primer layer 4 is formed by applying a primer agent to the cleaned surfaces of the retention areas A and B and their surroundings, and drying the primer agent.
Suitable priming agents are as described above. In order to form the primer layer 4 with the above-mentioned suitable thickness, the coating amount of the primer agent is preferably 50 g/m ² to 1000 g/m ² , more preferably 100 g/m ² to 500 g/m ² , and 150 g/m 2 . More preferably m ² to 300 g/m ² .
After applying the primer, it is preferable to wait for it to dry naturally.

The curable silicone member installed after this step can be bonded to curved or bent areas while completely following the shape of the area. Therefore, there is no problem even if the area to which the primer is applied in this step is curved or bent. On the other hand, when applying the weed suppression tape proposed in Patent Document 1 to a curved or bent area, if the radius of the curve is large or the degree of bending is large, the weed suppression tape to be applied may wrinkle. This tends to occur, making it difficult to achieve sufficient adhesion.
Note that the expression that the area to which the primer is applied in this step is curved or bent means that the area is curved or bent when the paved surface 1 or the paved surface 3 is looked down from above. Therefore, both of the retention areas A and B in FIGS. 1 to 4 are not curved or bent areas. Although not shown, for example, a curb installed along a curved road may have a curved or curved retention portion.

[Process C]
Step C is a step of forming a base treatment material 5 by applying a paste made of uncured silicone to the retention areas A and B on which the primer layer 4 is formed and filling at least a portion of the retention areas A and B. be.
Suitable uncured silicone pastes are described above. When using condensation-curing silicone, apply the paste extruded from the cartridge to the retention areas A and B, and apply it lightly with a spatula, etc., to coat the retention areas A and B and the rough surfaces around them. The paste can be sufficiently filled.
After that, you may wait until the base treatment material 5 made of the applied paste hardens, or you may proceed to the next step D without waiting for the hardening.

[Process D]
Step D is a step of applying a sheet (weed germination prevention sheet) 6 made of uncured silicone to cover at least a portion of the base treatment material 5 and the primer layer 4 .
By applying uncured silicone and then curing it, the sheet 6 can be sufficiently adhered to the base treatment material 5 and the primer layer 4.
The suitable uncured silicone constituting the sheet 6 before application is as described above.
The hardening type silicone constituting the base treatment material 5 and sheet 6 installed in the above steps will completely harden if left for a while.

《Weed germination prevention sheet》
A third aspect of the present invention is a sheet made of uncured curable silicone, which is used to cover at least a portion of the base treatment material and the primer layer in the method for installing a weed germination prevention structure according to the second aspect. This is a weed germination prevention sheet. Although the sheet itself is the same as a conventional uncured silicone sheet, its use is new and different from conventional ones.

[Example 1]
On the premises of Shin-Etsu Polymer Co., Ltd.'s Tokyo factory, there are areas where dust has accumulated and weeds have grown in the depressions between the asphalt-paved road surface and the concrete curb stones installed along this road surface. I found one (about 40cm long).
The weeds were pulled out, soil and sand were removed with a broom, and the depression at the boundary and the surface around it were cleaned. A primer agent (manufactured by Shin-Etsu Chemical Co., Ltd., Primer MT) was applied thereto to a thickness of about 200 g/m ² and allowed to dry naturally to form a primer layer (thickness of about 0.2 mm).
Next, a commercially available paste made of uncured condensation-curing silicone was applied to a thickness of about 5 mm or more around the depression, and the surface was leveled with a sponge spatula. As a result, a base treatment material was formed that filled the depressions and the surrounding asphalt surface irregularities.
Next, a sheet made of uncured condensation-curing silicone (Polymer Ace PA, manufactured by Shin-Etsu Polymer Co., Ltd.) was attached to cover the base treatment material and a part of the primer layer formed over a wider area, and the sheet was placed on the installation surface. I pressed it against it so that it would blend in.
By the above method, a weed germination prevention structure similar to the weed germination prevention structure 10A shown in FIGS. 1 and 2 was installed. After installation, the silicone members (base treatment material and sheet) constituting this weed germination prevention structure became rubber-like from the surface and were completely cured.
When the weed germination prevention structure installed above was observed for 6 months, no changes occurred and it remained stable despite being exposed to wind and rain and receiving direct sunlight.

[Example 2]
Example 1 was carried out in the same manner as in Example 1, except that several grams of carbon black was added as a light shielding material to a paste made of uncured condensation-curing silicone, and the mixture was thoroughly mixed to form a black paste before use. A structure to prevent weed germination was installed. The total light transmittance of this base treatment material 5 was about 20%.

[Comparative example 1]
A commercially available transparent adhesive tape having an acrylic resin adhesive layer was attached near the weed germination prevention structure of Example 1. That is, after cleaning the weed-grown depressions at the boundary between the asphalt surface and the curb and removing dirt and sand, transparent adhesive tape (approximately 5 cm wide and 30 cm long) was attached to this surface. . However, the surface to which it was attached was rough, and the area that was substantially adhered to was small.
When the transparent adhesive tape installed above was observed, it was clear that the longer it was exposed to wind and rain and exposed to direct sunlight, the more easily it deteriorated, and it peeled off by the end of two weeks.

10A, 10B Weed germination prevention structure 1 Roadway paved surface 2 Curb 3 Sidewalk paved surface 4 Primer layer 5 Base treatment material 6 Sheet (weed germination prevention sheet)

Claims (11)

A weed germination prevention structure installed to cover the boundary between a paved surface of a road and other structures, wherein the weed germination prevention structure includes a primer layer, an uncured hardening type silicone , etc. from the paved surface. It has a structure in which a base treatment material is cured after being applied , and a sheet made of uncured curable silicone is cured after being applied, in this order.
The weed germination prevention structure has a relationship of: area of the primer layer>area of the sheet>area of the base treatment material when the structure is viewed from above . A retention part is formed at the boundary,
The retention part consists of a groove, a depression, a step, a gap, or a joint in which dirt and dust can accumulate,
The weed germination prevention structure according to claim 1, wherein the surface constituting the retention portion and its surroundings is an asphalt surface, a concrete surface, or a mortar surface. The weed germination prevention structure according to claim 1, wherein at least one of the base treatment material and the sheet contains a light blocking material. The weed germination prevention structure according to any one of claims 1 to 3, wherein the total light transmittance of at least one of the base treatment material and the sheet is 30% or less. The weed germination prevention structure according to any one of claims 1 to 4, wherein at least one of the base treatment material and the sheet is black or gray. The weed germination prevention structure according to any one of claims 1 to 5, wherein the other structure is a curb or a pillar. The weed germination prevention structure according to any one of claims 1 to 6, wherein at least one of the surface treatment material and the sheet contains a germination inhibitor or a herbicide. A method for installing the weed germination prevention structure according to any one of claims 1 to 7 in a retention area at the boundary between a paved surface of a road and other structures,
The retention part consists of a groove, a depression, a step, a gap, or a joint in which dirt and dust can accumulate,
cleaning the surface of the asphalt surface, concrete surface, or mortar surface constituting the retention part and its surroundings;
forming a primer layer by applying a primer agent to the surface and drying it;
forming a base treatment material by applying a paste made of uncured silicone to the retention area where the primer layer is formed and filling at least a portion of the retention area;
applying a sheet made of uncured silicone to cover at least a portion of the base treatment material and the primer layer;
A method for installing a weed germination prevention structure characterized by having the following.
The method for installing a weed germination prevention structure according to claim 8, wherein the amount of the primer applied is 100 g/m ² to 500 g/m ² . The method for installing a weed germination prevention structure according to claim 8 or 9, wherein the area to which the primer is applied is curved or bent when the paved surface is viewed from above. A sheet made of uncured hardening silicone,
In the method for installing a weed germination prevention structure according to any one of claims 8 to 10,
A weed germination prevention sheet used to cover at least a portion of the base treatment material and the primer layer.

Images