JPH0656606A - Weed preventing sheet and its execution method - Google Patents

Abstract

PURPOSE:To obtain a weed preventing sheet capable of suppressing propagation of weeds, etc., and having water permeability and to provide an executing method using this weed preventing sheet. CONSTITUTION:This weed preventing sheet is characterized in that the sheet is a woven fabric obtained by using a synthetic fiber yarn having 10-250 denier and the sheet has 500/cm<2> fine pores having 700-2000mum<2> average area and 10<-3> to 10<-4>cm/sec coefficient of water permeability. The execution method is characterized by providing a gravel layer on this weed preventing sheet and providing a river sand layer under this sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weed-preventing sheet, a weed-preventing layer and a construction method thereof. .

[0002]

2. Description of the Related Art Conventionally, various chemical and physical weed control means have been used in order to maintain the aesthetic appearance of cities, buildings, structures, vacant lots and the like. Among them, as a chemical means,
A general method is to spray a herbicide. However, this method has a problem that the effect is generally temporary, and that the effects of the herbicide cause damage to surrounding crops, and that the rainwater causes the herbicide to flow out, which may cause pollution problems. ,
There was a problem that usage and place were limited. On the other hand, as a physical means, a method using asphalt coating, concrete coating, and further laying gravel or ballast, and a material having a light shielding effect such as a vinyl chloride sheet or a non-woven sheet are generally known. However, the method using asphalt coating or concrete coating has a problem that it is very expensive but it is very expensive, aesthetically impaired, and it is difficult to remove asphalt and concrete when reusing land. . Also, it is difficult to exert a sufficient weed-control effect with the method of laying only gravel or balas,
Although it is possible to stop the spreading of roots of weeds by means of a PVC sheet, there is a problem that water does not enter the ground due to rainfall and the surface becomes a puddle because it is water impermeable.
In the case of a non-woven sheet, it does not have the above-mentioned drawbacks, but when the seeds in the soil germinate, the sheet is breached, especially grass plants such as Japanese pampas grass have the drawback that they cannot significantly exhibit weed control effects. there were.

[0003]

DISCLOSURE OF THE INVENTION The present invention aims to provide a novel weed control means by ameliorating the disadvantages of various conventional weed control means. The present invention has a strong herbicidal effect like a herbicide, but it is not temporary, there is no regulation of the location due to pollution problems, and like conventional herbicidal sheets, there is no breakage by grass plants with strong vitality. Furthermore, the purpose of the present invention is to provide a weed-preventing sheet that has water permeability and air permeability and does not cause puddles, a weed-preventing layer, and a method of constructing a weed-preventing sheet that is easy to construct and does not spoil the appearance. .

[0004]

The present invention takes the following means in order to solve the above problems. That is,
The present invention comprises a woven fabric using synthetic fiber yarns of 10d to 250d, the average area of fine pores formed by the warp and weft gaps is 700 μm ² or more and 2000 μm ² or less, and the fine pores are 500 A number of pieces / cm ² or more and a water permeability coefficient of 10 ⁻³ to 10 ⁻⁴ cm / sec, and a grass layer, and a gravel layer, a grass sheet, and a river sand layer are laminated in this order from the top. In the weed-preventing layer and the weed-preventing construction method, a step of excavating a weed stalk on the surface of the dew surface and then digging a depth of 0 to 200 mm from the dew surface, and then laying a river sand layer 0 to 200 mm thick Step, then step of laying weedproof sheet, then 50-300 crusher run or gravel
This is a method of constructing a weed-preventing sheet, which is characterized by sequentially performing the steps of laying mm thickness.

In the present invention, the weed-preventing sheet is made of a synthetic fiber high-density fabric, and it is necessary that both warp and weft yarns are made of synthetic fiber yarn. The synthetic fiber yarn is preferable because it is physicochemically stable, excellent in physical properties, excellent in durability, and strong against adhesion of bacteria, mold, insects and the like.

The synthetic fiber yarn to be constituted is any one of polyester type, polyvinyl acetate alcohol type, polyamide type, polyvinyl chloride type, polyvinylidene chloride type, polyacrylnyryl type, polyolefin type, polyethylene type and polypropylene type. It does not matter which one kind is used alone, two kinds or more are mixed, or two kinds or more are mixed and used.

The denier of the synthetic fiber yarn is 10 to 25.
It is preferably within the range of 0 denier. The finer the denier, the greater the number of fine pores in the unit area of the woven fabric, which is excellent in the water permeation effect. However, when the denier is less than 10 denier, the sheet becomes too thin to be stretched, which is not preferable. On the other hand, if it exceeds 250 denier, the thickness of the woven fabric becomes thick and at the same time the number of fine pores becomes small, resulting in poor water permeability, which is not preferable.

The larger the number of filaments in the synthetic fiber yarn, the better. When the number of filaments is large, the yarn is crushed in the fabric structure and the apparent thickness becomes large, and as a result, micropores excellent in water permeation and waterproof effect are easily formed.

[0009] In the present invention, the average area per one fine hole formed at warp and weft intervals are required to be a 700 .mu.m ² or more 2000 .mu.m ^2. If the average area of the micropores exceeds 2000 μm ² , the roots of the plant will pass through, making it impossible to obtain grass-controlling properties. On the other hand, if the area of the fine pores is less than 700 μm ² , the water permeability becomes poor, which is not preferable. Further, it is preferable that either the warp spacing or the weft spacing is 5 μm or more. The interval length is 5 μm
If it is less than this, the water permeability is poor. It is preferable that the warp and weft intervals are substantially the same.

The number of fine holes is 500 / cm ² or more. It is preferably 500 to 12000 pieces / cm ² .
Since the product of the amount of water passing through one micropore and the number of products is the water permeability of the entire sheet, the more micropores the better the water permeability.
If the number exceeds 12,000 pieces / cm ² , the required area is 700-
Increasing the number while securing 2000 μm ² makes it necessary to make the denier or apparent thickness of the yarns that make up the woven fabric thinner than necessary, and the woven fabric becomes thin to eliminate tension and waist, making it difficult to handle. In addition to that, it is not good because it is expensive. Also, if the number is less than 500 / cm ² , it is necessary to make the apparent thickness of the woven fabric thread thicker, the fabric becomes thicker and heavier, and the handling becomes worse, and at the same time the amount of water permeation decreases and the water permeability deteriorates. Absent.

The woven structure may be either plain weave, twill weave or satin weave. Further, the woven fabric used in the present invention may be subjected to post-processing such as dyeing, resin processing and hydrophilic processing, or may be subjected to calendar processing or the like to be crushed and smoothed.

Next, a method for constructing the grass sheet will be described. In the present invention, the weed control construction of the ground on which weeds grow requires firstly removing the weed stalks on the surface of the dew surface and then excavating a depth of 0 to 200 mm from the dew surface. The excavated thickness from the dew surface may exceed 200 mm, but it is not necessary because excavation of 200 mm removes most of the rhizome of weeds.

Next, a step of laying a river sand layer with a thickness of 0 to 200 mm is carried out.

Next, a grass-proof sheet made of a synthetic fiber high-density fabric is laid. The number of sheets laid at this time is 1 to 2
It is preferable to lay one sheet. If the number of grass-proof sheets is too large, the water permeability is adversely affected, which is not preferable.

Next, crusher run or gravel 50 to 50
Carry out the process of laying 300 mm thick. The particle size of the crusher run or gravel is preferably 0 to 40 mm, more preferably 10 to 40 mm. Grain size of crusher run or gravel is 4
If it exceeds 0 mm, the appearance of the construction area is impaired and it becomes difficult to walk on the gravel layer, which is not preferable. Further, if the laying thickness of the gravel layer is less than 50 mm, sunlight cannot be blocked, and if weeds break through the weed-preventing sheet and weeds grow, the growth is accelerated by sunlight, which is not preferable. Further, if the laying thickness of the gravel layer exceeds 300 mm, there is no functional problem, but it is not preferable because it makes it difficult to walk on the gravel layer and the construction cost increases.

By carrying out the above weed control, it becomes possible to fully exert the weed control effect of weeds by the weed control sheet.

[0017]

【Example】

Example 1 As the weed-preventing sheet used, a polyester plain woven fabric was used, and the denier of the fibers constituting the warp and the weft was 74 d-
24f, the average area of micropores is 1216μm ² , the number of micropores is 1586, and the water permeability coefficient is 10 ^-3 cm / sec. It was confirmed. First, after removing the weed stalks on the surface of the dew surface 1 at a place where growth such as shinobi and sukisuki was remarkable, a depth of 200 mm was excavated from the dew surface and a river sand 4 of about 200 mm thick was laid there. Next, a weed-preventing method was carried out by laying one piece of the above-mentioned weed-preventing sheet 3 and further laying 200 mm thick gravel 2 having a diameter of 15 mm thereon. After the construction test, after confirming the weed control condition for 2 years, some weeds were observed to grow in the summer when the weed control was carried out due to the weathering of the seeds. Among them, the growth of Susuki was not seen at all because it had a particularly strong vitality. In addition, weeds that happen to grow due to wind clothes can be easily pulled out because they do not root, and even during the winter,
It didn't matter because it died naturally. In addition, it is rare to see puddles caused by rainwater,
No sheet breakage was observed.

Example 2 As the weed-preventing sheet used, a polyester plain woven fabric was used, and the denier of the fibers constituting the warp and the weft was 75 d-
24f, average area of micropores is 703 μm ² and micropores are 1
The weed-preventing effect was confirmed by performing the following construction method using a weed-preventing sheet having 850 pieces and a water permeability of 10 ⁻³ cm / sec. First,
In the same place as in Example 1, after removing the weed stalks on the surface of the dew surface of the place where growth such as plow is remarkable, only 1 from the dew surface.
Excavation was carried out to a depth of 00 mm, and river sand was laid there to a thickness of 100 mm. Next, we laid one sheet of the above-mentioned weed control sheet, and further carried out a weed control method of laying 100 mm thick gravel with a diameter of φ15 mm on it. After the construction test, we confirmed the weed control status for two years, At the place where weed control was carried out, some weed growth was observed due to the weathering of seeds, especially in the summer. I couldn't do it. In addition, weeds that happened to grow due to wind conditions could be easily pulled out because they did not form roots, and they also died naturally during the winter, so there was no problem. In addition, it was hardly seen that puddles were formed due to rainwater and the like, and that sheets were not torn.

Comparative Example 1 The weed-preventing sheet used was made of a polyester non-woven fabric and had a fiber thickness of 4.7d and a basis weight of 200 g / m.
^2. Using the weed proof sheet having a water permeability of 10 ^-1 cm / sec, the following construction method was carried out and the weed proof effect was confirmed. First Example 1
After removing the weed stalks on the surface of the dew surface at the same location, a 100 mm depth was excavated from the dew surface, and 100 mm thick river sand was laid there. Next, a weed-preventing method was carried out by laying one of the above-mentioned weed-preventing sheets and further laying 100 mm thick gravel having a diameter of 15 mm thereon. After the construction test, we confirmed the weed control status for two years, and at the place where weed control was carried out,
Especially in the summer, the weeds have a particularly strong vitality among the weeds, and Susuki has grown through the sheet.
Especially from the second year, the growth of weeds was tremendous, and the role of the weed-proof sheet was hardly obtained.

Comparative Example 2 As a weed-preventing sheet to be used, a vinyl chloride sheet having a thickness of 200 μm was used as the weed-preventing sheet, and the following construction method was carried out to confirm the weed-preventing effect. First, after removing the weed stalk on the surface of the exposed surface at the same place as in Example 1, the surface was excavated to a depth of 100 mm, and river sand was laid there to a thickness of 100 mm. Next, lay one sheet of the above-mentioned weed-proof sheet, and then dia.
The weed control method of laying 100 mm of gravel was carried out. After the construction test, we confirmed the weed control condition for two years, and at the place where weed control was carried out, by the wind-weathering of the seeds,
In particular, some growth of weeds was observed in the summer, but no growth of plowed grass etc. was seen at all, because the weeds have particularly strong vitality. However, since the sheet does not allow water to pass through, rainwater and the like are likely to accumulate, and a problem arises in which water is always accumulated.

Comparative Example 3 As the weed-preventing sheet used, a plain woven fabric made of polyester was used, and the denier of the fibers constituting the warp and the weft was 75 d-
The weed-preventing effect was confirmed by carrying out the following construction method using a weed-preventing sheet having a pore size of 24 f, an average area of micropores of 2013 μm ² , 1437 micropores and a water permeability of 10 ⁻³ cm / sec. First, after removing the weed stalks on the surface of the dew surface at a place where growth such as sukisuki was remarkable at the same place as in Example 1, a 100 mm deep excavation was carried out from the dew surface, and 100 mm thick river sand was laid there. . Next, a weed-preventing method was carried out by laying one of the above-mentioned weed-preventing sheets and further laying 100 mm thick gravel having a diameter of 15 mm thereon. After the construction test, we confirmed the weed control status for two years, and in the place where weed control was carried out,
In addition to the growth of some weeds due to the weathering of seeds, weed roots were observed to invade from below the weed control sheet through the holes in the weeds and grow.

[0022]

EFFECTS OF THE INVENTION The weed-preventing sheet of the present invention suppresses the growth of weeds and the like, has water permeability and air permeability and does not cause water pools, and the construction method of the present invention impairs aesthetics. It is possible to easily construct a grass-proof layer having a grass-proof effect by using the grass-proof sheet.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a weed-preventing layer of the present invention.

[Explanation of symbols]

 1 Dew surface 2 Gravel layer 3 Weed control sheet 4 River sand layer

Claims (3)

[Claims] 1. A woven fabric comprising synthetic fiber threads of 10d to 250d, wherein the average area of fine pores formed by the warp and weft gaps is 700 μm ² or more and 2000 μm ² or less, and the fine pores are 500. A grass-proof sheet characterized by having a number of particles / cm ² or more and a water permeability coefficient of 10 ⁻³ to 10 ⁻⁴ cm / sec. 2. A weed-preventing layer comprising a gravel layer, a weed-preventing sheet and a river sand layer which are laminated in this order from the top. 3. In the weed control method, the step of excavating a weed stalk on the surface of the dew surface and then excavating it to a depth of 0 to 200 mm from the surface of the dew, then laying a river sand layer to a thickness of 0 to 200 mm, and then claiming The step of laying a weed-preventing sheet made of the high-density woven fabric according to item 1, and then 50 to 30 crusher runs or gravel.
A weed-proof sheet construction method characterized by sequentially laying 0 mm thick.