Rooftop weed control structure and rooftop weed control components

Abstract

This prevents plants from growing on the rooftop. [Solution] The rooftop weed control structure A, installed on a rooftop having a drain section 102 for draining rainwater, includes a weed control member 1 that is fixed to the rooftop waterproof sheet 202 around the drain section 102 and has a growth-inhibiting component that inhibits plant growth and is placed on the water channel for rainwater flowing toward the drain section 102.

Description

Technical Field

[0006] , ,

[0001] The present disclosure relates to a roof weed prevention structure and a roof weed prevention member.

Background Art

[0002] As a waterproof structure for the roof of a building, for example, a waterproof structure using a vinyl chloride sheet is known. In the case of a waterproof structure using a vinyl chloride sheet, usually, at the ends such as the inner corner part, the outer corner part, and the drain part, a vinyl chloride waterproof sheet and a vinyl chloride-coated steel plate (hereinafter referred to as a fixed steel plate) coated with vinyl chloride are provided, and the waterproof sheet is joined to the fixed steel plate with a solvent or a hot air blower. In a part with a complex shape, a formed member pre-formed along the shape is connected to the waterproof sheet.

[0003] Further, Patent Document 1 discloses a weed prevention plate that suppresses the growth of weeds from the gap between a cement concrete curb and a paving material. This weed prevention plate is arranged parallel to the surface of the cement concrete curb and is provided below the paving surface. <000​​​​​​​​​​​​​​​​​​​​​​​​​​​

[0007] Furthermore, plant seeds can be carried onto rooftops by wind and rain. These seeds can be carried by rainwater to the area around the drain, and if fallen leaves and dust accumulate around the drain, the seeds can germinate and grow into weeds and other plants. In this regard, the weed-proof board disclosed in Patent Document 1 is a component installed in the gap between the cement concrete curb and the paving material, and was not designed with application to rooftops in mind.

[0008] When weeds grow on a rooftop, their roots can tear the waterproofing membrane or clog drains, increasing the risk of water leaks. Furthermore, removing overgrown weeds becomes a time-consuming process when installing new drains during rooftop renovation work.

[0009] To prevent these problems, it is necessary to clean the drain area frequently, but this is difficult because it is a hard-to-reach place like a rooftop.

[0010] This disclosure is made in view of the above points, and its purpose is to suppress the growth of plants on the rooftop. [Means for solving the problem]

[0011] To achieve the above objective, one aspect of this disclosure may be based on a rooftop weed control structure provided on a roof having a drain for rainwater drainage. The rooftop weed control structure includes a weed control member having a growth-inhibiting component that is fixed to the waterproof sheet of the roof around the drain and inhibits plant growth, and is positioned in the water channel for rainwater flowing toward the drain.

[0012] With this configuration, when rainwater that falls on the roof flows towards the drain, it becomes possible to incorporate the growth-inhibiting components of the weed-suppressing material into the rainwater. As a result, even if fallen leaves and dust accumulate around the drain and plant seeds are present, the rainwater will supply the seeds with growth-inhibiting components, thereby inhibiting plant growth.

[0013] The weed-suppressing member may be made of a steel plate with a plated layer containing zinc as a growth-inhibiting component formed on its surface. With this configuration, zinc, which is highly effective as a growth-inhibiting component, can be placed on the rainwater channel, so that the rainwater flowing towards the drain can contain the element zinc. This significantly enhances the plant growth-inhibiting effect.

[0014] A back-side polyvinyl chloride layer may be formed on the back surface of the steel plate, which is joined to the waterproof sheet on the roof. With this configuration, when fixing the weed control member to the waterproof sheet made of polyvinyl chloride, the back-side polyvinyl chloride layer can be joined to the waterproof sheet with a solvent or a hot air gun, resulting in improved workability.

[0015] A surface vinyl chloride layer may be formed on the outer periphery of the surface of the steel plate. With this configuration, the surface of the weed control member can be joined to the waterproof sheet by the surface vinyl chloride layer, thereby further enhancing waterproofing.

[0016] The steel plate may be provided with a through-hole into which the strainer of the drain section is inserted. In this case, the plating layer can be formed to surround the through-hole, thereby ensuring that the rainwater flowing toward the drain section contains zinc.

[0017] The weed-preventing member may further include a flexible member connected to the steel plate at one end, and a fixing member connected to the other end of the flexible member and fixed to the waterproof sheet on the roof. With this configuration, the installation of the weed-preventing member is completed by fixing the fixing member to the waterproof sheet on the roof. In this case, since the steel plate and the fixing member are connected via the flexible member, there is a high degree of freedom in the position of the fixing member, resulting in good workability.

[0018] The steel plate may have a connecting hole formed therein, to which one end of the flexible member is connected. This allows the flexible member to be securely and easily attached to the steel plate.

[0019] The back surface of the weed-proof member may be fixed to the waterproof sheet on the roof by an adhesive such as, for example, an epoxy resin. Thereby, the weed-proof member can be fixed to the waterproof sheet on the roof by a joining method other than fusion or welding.

[0020] In another aspect of the present disclosure, it is possible to assume a roof weed-proof member fixed to a waterproof sheet laid on a roof having a drain portion for rainwater drainage. The roof weed-proof member is fixed around the drain portion and has a growth-inhibiting component that inhibits the growth of plants and is disposed on the water path of rainwater flowing toward the drain portion. Therefore, the growth-inhibiting component is supplied to the seeds existing around the drain portion by rainwater, and the growth of plants is inhibited.

[0021] The weed-proof member may be rectangular in plan view and the four corners may be rounded. According to this configuration, cracks are less likely to occur in the waterproof sheet in a state where the weed-proof member is fixed to the waterproof sheet on the roof.

Advantages of the Invention

[0022] As described above, since the growth-inhibiting component can be arranged on the water path of rainwater flowing toward the drain portion, even if fallen leaves and dust accumulate around the drain portion and plant seeds are present, the growth of plants on the roof can be suppressed.

Brief Description of the Drawings

[0023] [Figure 1] FIG. 1 is a perspective view showing a roof weed-proof structure according to Embodiment 1 of the present invention. [Figure 2] FIG. 2 is a partial cross-sectional view of the roof weed-proof structure according to Embodiment 1 of the present invention. [[ID=2,8]] [Figure 3] FIG. 3 is a perspective view of the weed-proof member according to Embodiment 1 of the present invention. [Figure 4] FIG. 4 is a perspective view showing a roof weed-proof structure according to Embodiment 2 of the present invention. [Figure 5] FIG. 5 is a partial cross-sectional view of the roof weed-proof structure according to Embodiment 2 of the present invention. [Figure 6] Figure 6 is a perspective view of a weed control member according to Embodiment 2 of the present invention. [Figure 7] Figure 7 is a perspective view showing a rooftop weed control structure according to Embodiment 3 of the present invention. [Figure 8] Figure 8 is a cross-sectional view of a part of a rooftop weed control structure according to Embodiment 3 of the present invention. [Figure 9] Figure 9 is a perspective view of a weed control member according to Embodiment 3 of the present invention. [Figure 10] Figure 10 is a perspective view showing a rooftop weed control structure according to Embodiment 4 of the present invention. [Figure 11] Figure 11 is a cross-sectional view of a part of a rooftop weed control structure according to Embodiment 4 of the present invention. [Figure 12] Figure 12 is a perspective view of a weed control member according to Embodiment 4 of the present invention. [Figure 13] Figure 13 is a perspective view showing a rooftop weed control structure according to Embodiment 5 of the present invention. [Figure 14] Figure 14 is a cross-sectional view of a part of a rooftop weed control structure according to Embodiment 5 of the present invention. [Figure 15] Figure 15 is a perspective view showing a rooftop weed control structure according to Embodiment 6 of the present invention. [Figure 16] Figure 16 is a cross-sectional view of a part of a rooftop weed control structure according to Embodiment 6 of the present invention. [Figure 17] Figure 17 is a perspective view showing a rooftop weed control structure according to Embodiment 7 of the present invention. [Figure 18] Figure 18 is a cross-sectional view of a part of a rooftop weed control structure according to Embodiment 7 of the present invention. [Figure 19] Figure 19 is a perspective view showing a rooftop weed control structure according to Embodiment 8 of the present invention. [Figure 20] Figure 20 is a cross-sectional view of a part of a rooftop weed control structure according to Embodiment 8 of the present invention. [Figure 21] Figure 21 is a plan view showing the joints of the weed control member according to Modified Example 1. [Figure 22] Figure 22 is a side view of the weed control member according to modified example 2. [Figure 23] Figure 23 is a side view of the weed control member according to Modification 3. [Modes for carrying out the invention]

[0024] Embodiments of the present invention will be described in detail below with reference to the drawings. The following description of preferred embodiments is essentially illustrative and is not intended to limit the present invention, its applications, or its uses.

[0025] (Embodiment 1) Figure 1 is a perspective view showing a rooftop weed control structure A according to Embodiment 1 of the present invention, with a portion shown as a cross-section. Figure 2 is a cross-sectional view of the rooftop weed control structure A according to Embodiment 1 of the present invention. Furthermore, Figure 3 is a perspective view of the weed control member 1 according to Embodiment 1 of the present invention.

[0026] Rooftop weed control structure A is a structure that can be applied, for example, to the roof frame 101 of a building 100. The roof frame 101 of the building 100 forms a flat roof on the rooftop and has a flat area 101a with a gentle slope and a rising section 101b that rises upward from the periphery of the flat area 101a. The roof frame 101 may be a reinforced concrete (RC) base or a structure having a metal deck plate.

[0027] The flat area 101a has a vertical drain section 102 for draining rainwater. As shown in Figure 2, the vertical drain section 102 has a drain hole 102a that penetrates the flat area 101a vertically, and a strainer 102b that is installed to cover the upper end opening of the drain hole 102a. The strainer 102b is formed to bulge upward and captures fallen leaves and other debris contained in the rainwater before it flows into the drain hole 102a. Therefore, fallen leaves and other debris may accumulate around the strainer 102b, although this is not shown in the figure.

[0028] A slit-shaped side water inlet 102c is formed on the peripheral wall of the strainer 102b. A mounting flange portion 102d is formed on the lower end of the strainer 102b, and this flange portion 102d is fixed to the flat surface 101a by a fastening member 103. A lower water inlet 102e is formed on the flange portion 102d. Due to the presence of the flange portion 102d, dust 104 and the like may accumulate around the flange portion 102d. This dust 104 may contain fallen leaves or seeds of plants such as weeds.

[0029] As shown in Figure 1, the roof structure 101 is fitted with a vertical waterproof sheet 200 covering the vertical section 101b, a flat waterproof sheet 201 covering the flat area 101a, and a pre-applied waterproof sheet 202. The vertical waterproof sheet 200, the flat waterproof sheet 201, and the pre-applied waterproof sheet 202 are components that make up part of the building 100, and are examples of waterproof sheets laid on the roof. The vertical waterproof sheet 200, the flat waterproof sheet 201, and the pre-applied waterproof sheet 202 are made of, for example, polyvinyl chloride.

[0030] Furthermore, the roof structure 101 is provided with fixing steel plates 105 for fixing the vertical waterproof sheet 200 and the flat waterproof sheet 201 to the roof structure 101. The fixing steel plate 105 has a horizontal plate portion 105a that extends along the flat area 101a and a vertical plate portion 105b that extends along the vertical portion 101b. The horizontal plate portion 105a is fixed to the flat area 101a by anchor bolts 106, for example. The fixing steel plate 105 is made of PVC-coated steel plate or the like, with its surface covered with polyvinyl chloride. Although not shown in the figures, another fixing steel plate separate from the fixing steel plate 105 is also fixed to the flat area 101a.

[0031] As shown in Figure 2, the pre-applied waterproof sheet 202 has a rectangular shape and is laid on a flat surface 101a. In the center of the pre-applied waterproof sheet 202, an opening 202a is formed that is shaped along the periphery of the upper end opening of the drain hole 102a, and penetrates the pre-applied waterproof sheet 202 in the thickness direction. The flange portion 102d of the strainer 102b overlaps the periphery of the opening 202a on the surface (upper surface) of the pre-applied waterproof sheet 202.

[0032] The waterproof sheet 201 for flat areas is positioned so as to overlap the surface of the pre-applied waterproof sheet 202, covering almost the entire flat area 101a. The peripheral edge of the back surface (bottom surface) of the waterproof sheet 201 for flat areas is joined to the upper surface of the horizontal plate portion 105a of the fixing steel plate 105 using a solvent or a hot air gun. In the portion of the waterproof sheet 201 for flat areas corresponding to the vertical drain portion 102, a rectangular opening 201a is formed so as to penetrate the waterproof sheet 201 in the thickness direction. This opening 201a is sufficiently larger than the flange portion 102d of the strainer 102b, and a long distance is ensured between the peripheral edge of the opening 201a and the flange portion 102d of the strainer 102b.

[0033] The lower portion of the vertical waterproof sheet 200 is positioned to overlap the peripheral edge of the surface of the flat waterproof sheet 201, and is joined to the peripheral edge using a solvent or a hot air gun.

[0034] The rooftop waterproofing structure using the vertical waterproofing sheet 200, the flat waterproofing sheet 201, and the pre-applied waterproofing sheet 202 is just one example, and the rooftop waterproofing structure to which the present invention applies is not limited to the structure described above. Furthermore, the position, shape, and range of the overlapping portions of the vertical waterproofing sheet 200, the flat waterproofing sheet 201, and the pre-applied waterproofing sheet 202 can also be arbitrarily set.

[0035] The rooftop weed control structure A includes a weed control member 1. The weed control member 1 is fixed to the pre-applied waterproof sheet 202, which is the waterproof sheet of the rooftop, around the vertical drain section 102 of the rooftop, and is a member that inhibits plant growth and has a growth-inhibiting component that is positioned in the water channel of rainwater flowing toward the vertical drain section 102. The flow of rainwater flowing toward the vertical drain section 102 on the rooftop is schematically shown in Figure 1 with arrow B. In this way, the water slope is set on the rooftop so that the vertical drain section 102 is located at the lowest position.

[0036] Specifically, as shown in Figure 3, the weed control member 1 is made of a steel plate 1b on which a plating layer 1a containing zinc as a growth inhibitor is formed on its surface. The plating layer 1a may be formed on the steel plate 1b by electro-galvanizing, or it may be made of hot-dip galvanizing. The method of forming the plating layer 1a is not particularly limited and can be formed by general hot-dip galvanizing methods, electro-galvanizing methods, thermal spraying, etc. When forming a plating layer mainly composed of zinc by hot-dip galvanizing, the plating methods specified in JIS H 8641 "Hot-dip galvanizing" etc. are used.

[0037] The thickness of the plating layer 1a is not particularly limited, but can be, for example, in the range of 1 μm to 150 μm. Having a thickness of 1 μm or more in the plating layer 1a allows the rainwater flowing toward the vertical drain section 102 to contain zinc elements. The plating layer 1a, which is mainly composed of zinc, only needs to be formed on at least the surface of the steel plate 1b, and is not excluded from being formed on both sides of the steel plate 1b. Furthermore, the thickness of the plating layer 1a may be uniform or non-uniform.

[0038] A backside polyvinyl chloride layer 1c is formed on the back surface of the steel plate 1b, which is bonded to the pre-applied waterproof sheet 202. The thickness of the backside polyvinyl chloride layer 1c is, for example, in the range of 100 μm to 350 μm, and it is preferable to have a thickness of 300 μm or less within that range.

[0039] The weed control member 1 is rectangular in shape when viewed from above, and its four corners are rounded. For example, each of the four corners of the weed control member 1 is formed as an arc with a radius of 1 mm or more, or 2 mm or more, so that all corners are composed of curved surfaces. Therefore, the weed control member 1 has no sharp parts, and when the weed control member 1 is fixed to the pre-applied waterproof sheet 202 on the roof, cracks are less likely to occur in the pre-applied waterproof sheet 202.

[0040] The thickness of the steel plate 1b is, for example, 1 mm or less. Since the weed control member 1 may be processed at the construction site, it is preferable that the thickness of the steel plate 1b be in the range of 0.4 mm to 0.8 mm, considering the ease of processing at the construction site. If the thickness of the steel plate 1b is less than 0.4 mm, the rigidity of the weed control member 1 may be insufficient, and it may not be able to maintain the shape as designed.

[0041] The shape of the weed control member 1 may be, for example, a square or a rectangle. Furthermore, the weed control member 1 may be a polygon other than a rectangle, or it may be circular or elliptical.

[0042] As shown in Figure 1, the size of the weed control member 1 is smaller than the opening 201a formed in the flat-area waterproof sheet 201. In addition, a through hole 1e is provided in the center of the weed control member 1 into which the strainer 102b of the vertical drain section 102 is inserted. The through hole 1e is circular in shape, corresponding to the outer shape of the strainer 102b. The diameter of the through hole 1e is set to be at least a predetermined size larger than the outer diameter of the flange section 102d of the strainer 102b, and a portion where soil and dust 104 accumulates is formed between the periphery of the flange section 102d and the periphery of the through hole 1e, as shown in Figure 2. By fixing the weed control member 1 to the pre-applied waterproof sheet 202 with the strainer 102b inserted into the through hole 1e, the weed control member 1 is fixed around the vertical drain section 102. The zinc, which is the main component of the plating layer 1a, is then placed on the channel of rainwater flowing toward the vertical drain section 102.

[0043] The plating layer 1a surrounds the through-hole 1e on the surface of the steel plate 1b and is formed seamlessly in the circumferential direction of the through-hole 1e. The back vinyl chloride layer 1c surrounds the through-hole 1e on the back surface of the steel plate 1b, and this back vinyl chloride layer 1c is also formed seamlessly in the circumferential direction of the through-hole 1e.

[0044] When fixing the weed control member 1 to the pre-applied waterproof sheet 202, the polyvinyl chloride layer 1c on the back side of the weed control member 1 is bonded to the pre-applied waterproof sheet 202 using a solvent or a hot air gun. With the weed control member 1 fixed to the pre-applied waterproof sheet 202, the plating layer 1a is located on the surface, so the rainwater flowing towards the vertical drain section 102 contains zinc. Zinc has the effect of suppressing plant growth.

[0045] As water containing zinc flows toward the vertical drain section 102, it is absorbed by the soil dust 104, thus retaining moisture. If the soil dust 104 contains plant seeds, the zinc-containing water inhibits germination and growth. Furthermore, if plant seeds are present on the plating layer 1a or between the plating layer 1a and the vertical drain section 102, the zinc-containing water comes into contact with the plant seeds, inhibiting germination and growth. In addition, because the components are joined without gaps using solvents or hot air blowers, a structure that prevents water leakage can be achieved.

[0046] (Embodiment 2) Figures 4 to 6 show a rooftop weed control structure A and a weed control member 1 according to Embodiment 2 of the present invention. Embodiment 2 differs from Embodiment 1 in that a surface vinyl chloride layer 1f is formed on the surface of the weed control member 1, and the rooftop weed control structure A includes a separate waterproof sheet 204. Hereinafter, the same reference numerals are used for parts that are the same as in Embodiment 1 and their descriptions are omitted, and the parts that differ from Embodiment 1 will be described in detail.

[0047] As shown in Figure 6, a surface vinyl chloride layer 1f is formed on the outer periphery of the surface of the steel plate 1b of the weed control member 1 of Embodiment 2. Since the steel plate 1b is rectangular, the surface vinyl chloride layer 1f has a rectangular frame shape. The area inside the surface vinyl chloride layer 1f on the surface of the steel plate 1b is a plating layer 1a. The surface area of ​​the plating layer 1a exposed inside the surface vinyl chloride layer 1f and the surface area of ​​the surface vinyl chloride layer 1f may be the same, or one may be larger than the other. For example, the surface area of ​​the surface vinyl chloride layer 1f as a percentage of the total surface area of ​​the weed control member 1 can be set to a range of 40% to 60%. This ensures that both the surface area of ​​the surface vinyl chloride layer 1f and the surface area of ​​the plating layer 1a exposed inside the surface vinyl chloride layer 1f are sufficiently large.

[0048] The thickness of the front vinyl chloride layer 1f is set in the same way as the back vinyl chloride layer 1c. Note that the thickness of the front vinyl chloride layer 1f and the back vinyl chloride layer 1c may be the same, the thickness of the front vinyl chloride layer 1f may be greater than the thickness of the back vinyl chloride layer 1c, and the thickness of the back vinyl chloride layer 1c may be greater than the thickness of the front vinyl chloride layer 1f.

[0049] The separate waterproof sheet 204 is made of polyvinyl chloride and has a rectangular frame shape. The inner dimensions of the separate waterproof sheet 204 are set to be shorter than the outer dimensions of the weed control member 1. This allows the inner portion of the separate waterproof sheet 204 to be positioned so as to overlap the outer polyvinyl chloride layer 1f of the weed control member 1. The inner portion of the separate waterproof sheet 204 is joined to the outer polyvinyl chloride layer 1f using a solvent or a hot air gun.

[0050] The inner dimensions of the separate waterproof sheet 204 are set to be greater than or equal to the outer dimensions of the area where the plating layer 1a is exposed from the surface vinyl chloride layer 1f. This allows the plating layer 1a to be left exposed without being covered by the separate waterproof sheet 204. The outer periphery of the separate waterproof sheet 204 is joined to the pre-applied waterproof sheet 202 using a solvent or a hot air gun.

[0051] In this second embodiment as well, since the weed control member 1 is fixed to the pre-applied waterproof sheet 202 and the plating layer 1a is located on its surface, the rainwater flowing toward the vertical drain section 102 contains zinc. As a result, the germination of plant seeds is suppressed, as is their growth.

[0052] (Embodiment 3) Figures 7 to 9 show a rooftop weed control structure A and a weed control member 1 according to Embodiment 3 of the present invention. Embodiment 3 differs from Embodiment 1 in that the weed control member 1 is fixed to the rooftop waterproof sheet by a flexible member 11 and a fixing member 12. Hereinafter, the same reference numerals are used for parts that are the same as in Embodiment 1 and their descriptions are omitted, and the parts that differ from Embodiment 1 will be described in detail. Note that in Figure 8, the cutting line is set so that the cross-sections of both the vertical drain section 102 and the flexible member 11 and fixing member 12 are visible.

[0053] Multiple connecting holes 1h are formed in the steel plate 1b. In this embodiment, since the steel plate 1b is rectangular and has four corners, a connecting hole 1h is formed near each corner. Thus, four connecting holes 1h are formed in one steel plate 1b. Note that the number of connecting holes 1h is not limited to four, but may be one, two, three, or five or more. Also, the position of the connecting holes 1h is not limited to the vicinity of the corners, but may be near the edge of the steel plate 1b, or in the center of the steel plate 1b or near the center.

[0054] The connecting holes 1h formed in the steel plate 1b in this embodiment are circular, but the shape of the connecting holes 1h is not limited to circular. For example, elliptical connecting holes 1h may be formed in the steel plate 1b, or polygonal connecting holes 1h may be formed in the steel plate 1b.

[0055] The weed control member 1 includes a flexible member 11, one end of which is connected to a connecting hole 1h in a steel plate 1b, and a fixing member 12, the other end of which is connected to the flexible member 11 and fixed to a waterproof sheet on the roof. The flexible member 11 is made of, for example, wire, rope, string, or a strip-shaped member, and has flexibility that allows it to bend and curve easily. The material of the flexible member 11 may be metal or resin. The flexible member 11 can be connected by inserting one end of it into the connecting hole 1h and tying it to the steel plate 1b. Alternatively, it may be connected by fixing one end of the flexible member 11 to the steel plate 1b. The length of the flexible member 11 can be set, for example, in the range of 1 cm to 20 cm. In this embodiment, since four connecting holes 1h are formed in the steel plate 1b, there are four flexible members 11.

[0056] The fixing member 12 is a member that is fixed to the flat-surface waterproof sheet 201 and is made of polyvinyl chloride. The shape of the fixing member 12 is not particularly limited and can be rectangular, circular, elliptical, or a polygonal shape other than a rectangle. The other end of the flexible member 11 may be tied through a hole (not shown) formed in the fixing member 12, or it may be fixed to the fixing member 12.

[0057] When fixing the weed control member 1 of Embodiment 3 to the flat-area waterproof sheet 201, only the fixing members 12 are joined to the flat-area waterproof sheet 201 using a solvent or a hot air gun. At this time, the fixing position of each fixing member 12 is set so that all the flexible members 11 are taut. This prevents the weed control member 1 from shifting from its fixed position. When fixing the weed control member 1 to the flat-area waterproof sheet 201, only the fixing members 12 need to be joined to the flat-area waterproof sheet 201, so the joining area is small and the workability is good.

[0058] In Embodiment 3, it is preferable to form a zinc plating layer on the back surface of the weed control member 1. That is, since the steel plate 1b itself is not joined, rainwater may flow between the back surface of the steel plate 1b and the pre-applied waterproof sheet 202. The rainwater that flows between the back surface of the steel plate 1b and the pre-applied waterproof sheet 202 comes into contact with the plating layer on the back surface of the weed control member 1, allowing it to contain a sufficient amount of zinc. This also improves drainage.

[0059] In this embodiment 3, with the weed control member 1 fixed to the flat-area waterproof sheet 201, the plating layer 1a is located on both the front and back surfaces, making it easier for the rainwater flowing toward the vertical drain section 102 to contain zinc. This suppresses both the germination and growth of plant seeds.

[0060] In addition, a back-side polyvinyl chloride layer 1c, as in Embodiments 1 and 2, may be formed on the back surface of the steel plate 1b in Embodiment 3. In this case, the back-side polyvinyl chloride layer 1c is bonded to the pre-applied waterproof sheet 202 using a solvent or a hot air gun.

[0061] (Embodiment 4) Figures 10 to 12 show a rooftop weed control structure A and a weed control member 1 according to Embodiment 4 of the present invention. Embodiment 4 differs from Embodiment 1 in that the weed control member 1 is fixed to the rooftop waterproof sheet by means of, for example, an adhesive. Hereinafter, the same reference numerals are used for parts that are the same as in Embodiment 1 and their descriptions are omitted, and the parts that differ from Embodiment 1 will be described in detail.

[0062] In other words, the weed control member 1 of Embodiment 4 does not have a back polyvinyl chloride layer 1c formed on its back surface. Instead, as shown in Figure 11, the back surface of the weed control member 1 is fixed to the pre-applied waterproof sheet 202 with an epoxy resin-based adhesive 13. During installation, the epoxy resin-based adhesive 13 is applied to at least one of the back surface of the weed control member 1 and the surface of the pre-applied waterproof sheet 202. Then, the weed control member 1 is pressed onto the surface of the pre-applied waterproof sheet 202, and the adhesive 13 is allowed to harden. This allows the weed control member 1 to be fixed to the pre-applied waterproof sheet 202 without the use of solvents or hot air blowers, thus reducing the difference in quality due to varying levels of installation skill. Furthermore, since the number of processing steps is reduced compared to Embodiments 1 to 3, installation becomes less expensive. A one-component adhesive is preferred, but a two-component adhesive may also be used.

[0063] In this embodiment 4 as well, since the weed control member 1 is fixed to the pre-applied waterproof sheet 202 and the plating layer 1a is located on its surface, the rainwater flowing toward the vertical drain section 102 contains zinc. As a result, the germination of plant seeds is suppressed, as is their growth.

[0064] (Embodiment 5) Figures 13 and 14 show a rooftop weed control structure A and weed control member 10 according to Embodiment 5 of the present invention. Embodiment 5 is an embodiment in which the present invention is applied to a lateral drain section 112. Hereinafter, the same reference numerals are used for parts that are the same as in Embodiment 1 and their descriptions are omitted, and the parts that differ from Embodiment 1 will be described in detail.

[0065] The lateral drain section 112 is designed to drain rainwater and the like from the riser section 101b, and a strainer 112b is fixed to the riser section 101b. The pre-applied waterproof sheet 202 is laid so as to cover the riser section 101b as well, and is also fixed to the fixing steel plate 115 (shown in Figure 14) provided on the riser section 101b.

[0066] The weed control member 10 is formed to surround the lateral drain portion 112, and specifically has a pair of extension portions 10A extending toward the rising portion 101b, and a connecting portion 10B connecting the ends of both extension portions 10A opposite to the rising portion 101b. The structure of the weed control member 10 is the same as in Embodiment 1, and has a plating layer 10a, a steel plate 10b, and a back vinyl chloride layer 10c. The back vinyl chloride layer 10c is bonded to the flat waterproof sheet 201 using a solvent or a hot air gun.

[0067] In this embodiment 5 as well, since the weed-preventing member 10 is fixed to the flat-area waterproof sheet 201 and the plating layer 10a is located on the surface, the rainwater flowing toward the lateral drain section 112 contains zinc. As a result, the germination of plant seeds is suppressed, as is their growth.

[0068] (Embodiment 6) Figures 15 and 16 show a rooftop weed control structure A and weed control member 10 according to Embodiment 6 of the present invention. Embodiment 6 is a configuration in which the present invention is applied to the lateral drain section 112 described in Embodiment 5. Hereinafter, the same reference numerals are used for parts that are the same as in Embodiment 5 and their descriptions are omitted, and the parts that differ from Embodiment 1 will be described in detail.

[0069] In Embodiment 6, similar to Embodiment 2, a surface vinyl chloride layer 10f is formed on the surface of the weed control member 10, and the rooftop weed control structure A includes a separate waterproof sheet 214. The separate waterproof sheet 214 has a shape that corresponds to the shape of the weed control member 10, with the rising portion 101b side open in a plan view. The separate waterproof sheet 214 is bonded to the pre-applied waterproof sheet 202 and the surface vinyl chloride layer 10f of the weed control member 10 using a solvent or a hot air gun.

[0070] In this embodiment 6 as well, since the weed-preventing member 10 is fixed to the flat-area waterproof sheet 201 and the plating layer 10a is located on the surface, the rainwater flowing toward the lateral drain section 112 contains zinc. As a result, the germination of plant seeds is suppressed, and their growth is also inhibited.

[0071] (Embodiment 7) Figures 17 and 18 show a rooftop weed control structure A and weed control member 10 according to Embodiment 7 of the present invention. Embodiment 7 is a configuration in which the present invention is applied to the lateral drain section 112 described in Embodiment 5. Hereinafter, the same reference numerals are used for parts that are the same as in Embodiment 5 and their descriptions are omitted, and the parts that differ from Embodiment 1 will be described in detail. Note that in Figure 18, the cutting line is set so that the cross-sections of both the lateral drain section 112 and the flexible member 11 and the fixed member 12 are visible.

[0072] In Embodiment 7, the weed control member 10 has a flexible member 11 and a fixing member 12, as in Embodiment 3. Only the fixing member 12 is joined to the flat-area waterproof sheet 201 and the vertical-area waterproof sheet 200 using a solvent or a hot air gun. In this way, when fixing the weed control member 10 to the flat-area waterproof sheet 201 and the vertical-area waterproof sheet 200, only the fixing member 12 needs to be joined to the flat-area waterproof sheet 201 and the vertical-area waterproof sheet 200, so the joining area is small and the workability is good.

[0073] In this embodiment 7, with the weed-preventing member 10 fixed to the flat-area waterproof sheet 201 and the vertical waterproof sheet 200, the plating layer 1a is located on both the front and back surfaces, making it easier for the rainwater flowing toward the lateral drain section 112 to contain zinc. This suppresses both the germination and growth of plant seeds.

[0074] (Embodiment 8) Figures 19 and 20 show a rooftop weed control structure A and weed control member 10 according to Embodiment 8 of the present invention. Embodiment 8 is a configuration in which the present invention is applied to the lateral drain section 112 described in Embodiment 5. Hereinafter, the same reference numerals are used for parts that are the same as in Embodiment 5 and their descriptions are omitted, and the parts that differ from Embodiment 1 will be described in detail.

[0075] In Embodiment 8, similar to Embodiment 4, the weed control member 10 is fixed to the rooftop waterproof sheet with an epoxy adhesive 23. Specifically, the back surface of the weed control member 10 is fixed to the flat-area waterproof sheet 201 with an epoxy resin adhesive 23. During installation, the epoxy resin adhesive 23 is applied to at least one of the back surface of the weed control member 10 and the surface of the flat-area waterproof sheet 201. Then, the weed control member 10 is pressed onto the surface of the flat-area waterproof sheet 201, and the adhesive 23 is allowed to harden. This allows the weed control member 10 to be fixed to the flat-area waterproof sheet 201 without the use of solvents or hot air blowers, thus reducing the difference in quality due to varying levels of installation skill. In addition, since the number of processing steps is reduced, inexpensive installation becomes possible. A one-component adhesive is preferred, but a two-component adhesive may also be used.

[0076] In this embodiment 8 as well, since the weed-preventing member 10 is fixed to the flat-area waterproof sheet 201 and the plating layer 10a is located on the surface, the rainwater flowing toward the lateral drain section 112 contains zinc elements. As a result, the germination of plant seeds is suppressed, and their growth is also inhibited.

[0077] (modified version) Figure 21 shows the joint C of the weed control member 1 in a modified example 1. As shown in this figure, the joint C of the weed control member 1 to the waterproof sheet may be partially provided. This allows rainwater to pass between the back surface of the weed control member 1 and the front surface of the waterproof sheet, improving drainage. In addition, although this figure shows an example where only the four corners are joined, this allows rainwater to drain more easily into the vertical drain section 102, enables construction without worrying about the effect of slopes due to steps, and increases the contact area between the plating layer 1a and rainwater. Alternatively, the entire back surface of the weed control member 1 may be joined to the waterproof sheet.

[0078] Figure 22 shows an example relating to Modification 2, in which the surface of the weed control member 1 is provided with irregularities. The irregularities can be provided, for example, by embossing. The surface of the weed control member 1 may be provided with only recesses or only protrusions. The recesses may be concave portions extending in a predetermined direction. The protrusions may be convex ridges extending in a predetermined direction. By providing such a shape, rainwater can easily accumulate on the surface of the weed control member 1, and it becomes easier for zinc elements to be contained. Grooves may also be formed on the surface of the weed control member 1.

[0079] Figure 23 shows an example relating to Modification 3, in which a water-retaining material 18 is provided on the back surface of the weed-control member 1. The water-retaining material 18 is made of, for example, a sponge or nonwoven fabric. By retaining rainwater in the water-retaining material 18, the contact time between the zinc contained in the plating layer formed on the back surface of the weed-control member 1 and the rainwater can be extended. The water-retaining material 18 may be provided in one place or in multiple places.

[0080] The embodiments described above are merely illustrative in all respects and should not be interpreted restrictively. Furthermore, any modifications or changes that fall within the equivalent scope of the claims are all within the scope of the present invention. [Industrial applicability]

[0081] As explained above, the rooftop weed control structure and weed control member relating to this disclosure can be used, for example, in a rooftop waterproofing structure for a flat roof. [Explanation of symbols]

[0082] 1. Weed control material 1a Plating layer 1b steel plate 1c Backside vinyl chloride layer 1f Front side vinyl chloride layer 11 Flexible member 12 Fixing member 13 Adhesive 102 Drain section 200 Waterproof sheet for vertical surfaces 201 Waterproof sheet for flat areas 202 Pre-applied waterproof sheet A. Weed control structure for rooftops

Claims

1. A rooftop weed control structure installed on a roof that has a drain section for rainwater drainage, A rooftop weed control structure comprising a weed control member having a growth-inhibiting component that is fixed to the waterproof sheet of the rooftop around the drain portion and inhibits plant growth, and is positioned in the channel for rainwater flowing toward the drain portion.

2. In the rooftop weed control structure described in claim 1, The aforementioned weed control member is a rooftop weed control structure made of a steel plate with a plated layer containing zinc as a growth inhibitor formed on its surface.

3. In the rooftop weed control structure described in claim 2, A rooftop weed control structure is provided, wherein a polyvinyl chloride layer is formed on the back surface of the steel plate, which is joined to the waterproof sheet of the rooftop.

4. In the rooftop weed control structure described in claim 2, A rooftop weed control structure is provided, wherein a surface polyvinyl chloride layer is formed on the outer periphery of the surface of the steel plate.

5. In the rooftop weed control structure described in claim 4, The steel plate is provided with a through hole into which the strainer of the drain section is inserted. The aforementioned plating layer surrounds the periphery of the through-hole, forming a weed-preventing structure for rooftops.

6. In the rooftop weed control structure described in claim 2, The weed control structure for a rooftop further comprises a flexible member connected to the steel plate at one end, and a fixing member connected to the other end of the flexible member and fixed to the waterproof sheet on the rooftop.

7. In the rooftop weed control structure described in claim 6, A rooftop weed control structure, wherein the steel plate has a connecting hole formed therein, to which one end of the flexible member is connected.

8. In the rooftop weed control structure described in claim 2, The back surface of the weed-preventing member is fixed to the waterproof sheet of the rooftop with adhesive, forming a weed-preventing structure for rooftops.

9. A rooftop weed control member that is fixed to a waterproof sheet laid on a rooftop having a drain section for rainwater drainage, It is fixed around the drain section, A rooftop weed control member having a growth-inhibiting component that inhibits plant growth and is positioned in the water channel for rainwater flowing toward the drain.

10. In the rooftop weed control member according to claim 9, A rooftop weed control material that is rectangular in shape when viewed from above, with rounded corners.

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