JPH11117251A - Weed-proof structure for pavement end section boundary face - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent the growth of weeds by burying the end section of a weed-proof sheet spread on the ground downward along the face of a concrete product, and fitting the tip to the face of the concrete product to interrupt the boundary face between the concrete product and sediment. SOLUTION: A weed-proof sheet 3 is spread on a roadbed 4 constituted of soil and small stones, its end section is buried downward along the back face 7 of a concrete retaining wall 8, and its tip is inserted into the insertion groove 5 of the retaining wall 8. The width and depth of the groove 5 are set to proper quantities corresponding to allowable settlement so that the roots of weeds do not penetrate downward and the weed-proof sheet 3 is not extracted by the external force applied to the weed-proof sheet 3 at the time of settlement of the ground. The boundary face 1 of the fitting section of the weed-proof sheet 3 is interrupted, thus a weed-proof effect can be assured regardless of the size of a submerged section 11. The fitting section of the sheet 3 can be provided at a deep position from the top end, thereby the strength of the corner of a concrete product is not degraded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weed prevention structure using a weed prevention sheet for preventing weeds from growing in a gap between an interface where a pavement contacts a concrete retaining wall or a sidewalk road boundary block. It is. In some cases, the purpose is only to control the grass on the ground without paving the grass sheet, but the following description will be made mainly for the case where there is a pavement. The “ground” refers to an area where grass grows, such as an embankment, a roadbed, and a roadbed.

[0002]

2. Description of the Related Art JP-A-7-173812, Utility Model Registration No. 3005777, and JP-A-8-60632 are known. These have the following problems.
(B) Japanese Patent Application Laid-Open No. Hei 7-173812 and Utility Model Registration No. 30
In FIG. 8 of Japanese Patent No. 05777, the end of the weed control sheet does not block the interface, and therefore, in order to prevent the growth of weed roots, the length of the weed control sheet (along the back surface of the concrete product) is required. It is necessary to secure a considerable amount of the part that extends downward. (B) When the anchoring portion of the weed prevention sheet is other than the bonding means, the strength of the anchoring portion is liable to decrease because the integrity of the concrete is low. Particularly, in the case of a concrete product in which the position of the fastening portion is shallow from the top end, the corner is easily damaged due to a strong overload. (C) When the grass sheet laid on the roadbed is fixed linearly to the concrete product,
Easy to pull out or tear off. (D) When the roadbed is constructed by turning up the moistened weed-proof sheet to the top of the concrete product, the ears of the roller are placed when the rolling roller of the roadbed is brought close to the concrete product. It is easy to damage the sheet.

[0003]

SUMMARY OF THE INVENTION The present invention is intended to solve these problems and has the following objects.
(B) The growth of weeds is surely prevented while keeping the length of the weed control sheet to a minimum necessary in accordance with the allowable sinking amount of the ground (paving). (B) The corners of concrete products are hardly damaged. (C) And against the sinking of the ground,
To prevent the grass sheet from being pulled out or pulled out,
Further enhance responsiveness to harmful deformation. (D) Prevent damage to the grass sheet by the roller.

[0004]

Means for Solving the Problems According to claim 1. In an area where weeds are in contact with a structure such as a concrete product, the end of the weed-proof sheet laid on the ground goes down along the surface of the concrete product, etc. In order to block the interface between the concrete product and the like, it is fixed to the surface of the concrete product or the like.

[0005] Corresponding to claim 2. A pavement is formed on the grass sheet of the first aspect.

According to claim 3. In the weed prevention structure according to the second aspect, the surface of the concrete product or the like above the engagement portion of the weed prevention sheet is positioned on the front side of the surface of the engagement portion.

[0007] The term "interrupt the interface to engage" means
It refers to a state in which buds emerging from below the herbicidal sheet and rooting on the sheet have such an effect that they do not grow through the interface in the vertical direction. There are two ways of engaging: (a) hooking or overlapping the tip of the grass sheet on the attachment prepared on the concrete side, (b) inserting the tip of the grass sheet into the groove provided on the concrete side, (c) ) The tip of the grass sheet is bonded to the concrete side.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. See FIG. Corresponds to claim 2. Concrete retaining wall 8
FIG. 4 is a cross-sectional perspective view of a region paved in contact with the slab. A grass sheet 3 is laid on a roadbed 4 made of soil or pebbles, an end of the sheet 3 extends downward along a back surface 7 of the retaining wall, and a tip is inserted into an insertion groove 5 of the retaining wall. The width and depth of the insertion groove 5 correspond to the allowable subsidence amount so that the roots of the weeds do not enter and penetrate downward, and the external force applied to the weed prevention sheet that works when the ground sinks does not come off. To make an appropriate amount. The construction procedure is as follows: when creating a concrete retaining wall, provide a groove for inserting a grass sheet, insert the end of the grass sheet into this groove, turn up the other end to the top end of the concrete retaining wall, and temporarily stop it. Keep it. Next, the embankment and the roadbed are constructed, and the temporarily stopped grass sheet is removed and laid, and the pavement is laid thereon.

In FIG. 1, when a tree-planting zone or the like is formed without paving, the grass-protecting sheet 3 is extended rightward in the figure to a target area to cover the ground widely and plant trees at important places. Such a usage form corresponds to claim 1.

FIGS. 2 and 3 are cross-sectional views showing the form of engagement between the concrete product and the grass sheet. See FIG. Attachment 13 buried on the back of the concrete product,
The tips of the weed control sheets 3 are overlapped so as to catch. The right figure in FIG. A shows the situation when the ground sinks. This shows a case in which the mowing part of the weed prevention sheet also sinks as the ground sinks, and the overlap of the hook portion of the tip of the weed prevention sheet is reduced by the amount of the sink. Therefore, it is necessary to set the length of the overlapping portion in accordance with the allowable amount of settlement. In addition, the sinking part sinks along with the ground when the degree of adhesion between the sinking part and the soil is high. In general, it is considered that this case is small because of the loose separation.

See FIG. The insertion groove 5 of the grass sheet is
The back is inclined upward. In the section of the grass sheet
It is difficult to pull out when an upward pulling force is applied. The figure on the right shows a case in which the hollow section of the grass sheet also sinks as the ground sinks, and a part of the insertion part of the grass sheet is pulled out and hangs downward.

See FIG. The tip of the grass sheet inserted into the insertion groove 5 is fixed by a fixing pin 10. For example, when the inserted other end is flipped up and fixed to the top end of the concrete product, it can be prevented from being easily removed when a pulling force is applied. The right figure shows the case where there is no close contact friction between the soil and the mowing part of the grass sheet, and the sinking of the pavement material forms a wrinkle by compressing the mowing part. No withdrawal of the insert has occurred.

See FIG. The insertion part of the weed-proof sheet is made into a wedge shape, lightly driven in, and has resistance to pulling out. Note that the wedge-shaped portion is preferably hardened.

See FIG. The attachment portion of the weed prevention sheet is used as an adhesive means.

See FIG. The attachment portion of the grass sheet is U-shaped, and the tip is embedded in a concrete product. See the figure on the right. When the boring part of the weed prevention sheet is settled under the ground, the U-shaped part becomes longer vertically and absorbs this.

See FIG. What is indicated by a broken line is a pavement material such as an interlocking block. The upper end of the boring part of the grass sheet is inverted U-shaped. See the figure on the right. As the horizontal part of the weed control sheet sinks, the inverted U-shape becomes longer vertically and absorbs the sinking.

See FIG. This shows a case where the grass sheet is hard, and no wrinkles are formed in the hollow portion of the grass sheet due to sinking of the ground, and no sinking occurs. Since the horizontal portion sinks while leaving the upper end of the mound portion, the edge of the pavement material is deformed as if pushed up. In an unfavorable example, it is also an object of the present invention to make such a thing less likely to occur, and the weed prevention sheet should have a moderate flexibility.

See FIG. This is a case where the sinking works along the undercut of the grass sheet, and since the tip is buried in the concrete product, no pull-out occurs, and a U-shape is formed below to absorb the sinking.

See FIG. Corresponds to claim 3. Weed control sheet 3
The clearance width 16 is ensured by inclining the back surface 7 above the engaging portion of FIG. When the roadbed 4 is rolled by the roller, even if the rolling wheel 15 is close to the rear surface, it does not hit the grass sheet along the rear surface, so that the risk of damage to the grass sheet is reduced. The amount of clearance is preferably set to the minimum necessary so that the pavement layer does not excessively cover the sidewalk boundary block. It is desirable that the range of the portion positioned on the front side with respect to the surface of the engagement portion of the grass sheet is above the rolling surface. If the slope continues below the rolling surface, it is not preferable because the force for pulling down the boring part of the weed prevention sheet at the time of pavement sinking increases. When there is no danger of sinking, the height of the engaging portion of the grass sheet and the upper surface of the roadbed may be the same.

Other details are as follows: (a) Since the grass-proof sheet is to be installed in a substantially crank shape, it is preferable to perform crease processing at important points. Also, it is preferable to make the insertion portion hard so that it can be easily pushed. (B) The material of the weed prevention sheet does not pass through both the buds and the roots, and is preferably flexible. If the pavement is asphalt, it shall withstand the temperature of the mixture. (C) The application is
It is used not only for blocks and cast-in-place concrete products, but also for artificial stone and bricks.

[0021]

【The invention's effect】

(A) Mainly corresponds to claims 2 and 3. As described above, there is an important function of the "moulding portion" as an effect of preventing deformation-damage and pull-out of the grass sheet due to sinking of the ground.
The method of action differs depending on the method of attachment and the degree of close friction between the "moulding portion" and the earth and sand. However, in reality, the cases described above may be combined. (B) Corresponding to claims 1, 2, and 3. Further, by blocking the interface of the engaging portion, the weed control effect can be ensured regardless of the size of the “moulding portion”. (If there is no interception of the interface, it is necessary to take a considerable length of the boring part so that the roots and buds do not come off.) (C) Corresponding to claims 1, 2 and 3. By providing the "weaving part" in the weed prevention sheet, the engaging part of the weed prevention sheet can be provided at a position deep from the top end. This does not reduce the strength of the corners of concrete products and the like. (In the case of an attachment method other than bonding, the strength tends to decrease because the integrity of concrete is hindered.) (D) Corresponding to claim 3. When rolling the roadbed or the like with a roller, the roller is prevented from hitting the grass sheet that has been flipped up and damaging the grass sheet. (E) Mainly corresponds to claims 2 and 3. When an external force acts to widen the gap at the interface, the upper part of the "moulding part" separates from the back surface, but no force acts to tear the engaging part.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view of a pavement edge interface.

FIG. 2 is a schematic cross-sectional view showing a state in which a grass sheet is attached and a state when the ground sinks.

FIG. 3 is a schematic cross-sectional view showing a state in which a grass sheet is attached and a state where the ground is submerged.

FIG. 4 is a sectional view of a pavement edge interface.

[Explanation of symbols]

 Reference Signs List 1 interface 2 pavement 3 grass sheet 4 roadbed 5 insertion groove 6 earth and sand 7 back surface 8 concrete retaining wall 9 settlement amount 10 fixing pin 11 gouge 12 allowable settlement amount 13 attachment 14 walkway boundary block 15 rolling wheel 16 relief width 17 front

Claims (3)

[Claims] 1. In an area where a weed grows in contact with a concrete product or the like, an end portion of the weed control sheet laid on the ground goes down along a surface of the concrete product or the like, and a tip of the weed prevention sheet extends to a lower end of the sheet. A weed prevention structure, which is fixed to a surface of the concrete product or the like so as to block an interface between the concrete product and the earth and sand. 2. The weed prevention structure according to claim 1, wherein a pavement is provided on the weed prevention sheet. 3. The herbicidal structure according to claim 2, wherein the surface of the concrete product or the like above the engaging portion of the grass sheet is located on the front side of the surface of the engaging portion.