JPH06220811A - Ground laid with sand-containing artificial lawn - Google Patents

Abstract

PURPOSE:To provide a ground which is excellent in cushioning property without unevenness by laying a cushion layer consisting of two layers, an upper layer of high specific gravity and a lower layer of low specific gravity, on the ground consisting of a crushed stone layer or the like, and thereon by laying a sand- containing artifical lawn. CONSTITUTION:On the ground 1 consisting of a crushed stone layer or the like, a cushion layer 2 consisting of two layers, a high specific gravity rubber urethane sheet 21 and a low specific gravity polyethylene foam sheet 22, is laid. Further, thereon, an artificial lawn 3 made of pile strands 32 consisting of synthetic resin such as polyamide with sand 33 therebetween is laid. The greater part of the impact energy produced by the athletics on a playground is absorbed by the cushion layer 2, and a part thereof is transmitted to the ground, so that too spongy feeling can be avoided. Thus, the artifical lawn that has an excellent cushioning property without uneveness and is relatively near to a natural lawn can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground on which artificial grass containing sand is laid.

[0002]

2. Description of the Related Art Conventionally, grounds such as stadiums, playgrounds and amusement parks where artificial grass with sand is laid have the advantages that they are not easily affected by the weather, are easy to maintain, and have excellent durability. Therefore, it is widely used.

As a gland on which artificial sand containing sand is laid in this way, conventionally, as described in Japanese Utility Model Publication No. 63-46488, for example, on the ground such as a crushed stone layer,
A cushion layer such as a synthetic resin foam sheet is provided, or alternatively, Japanese Utility Model Publication No. 57-133374 and Japanese Utility Model Publication 57-57-.
As described in Japanese Patent No. 133606, a gland is known in which a cushion layer such as an uneven rubber sheet is provided, and an artificial grass containing sand is laid on the cushion layer.

[0004]

However, as described in the above-mentioned Japanese Utility Model Publication No. 63-46488, in a gland in which a cushion layer such as a synthetic resin foam sheet is provided on the ground such as a crushed stone layer. When a cushion layer having a low specific gravity is used to enhance the cushioning property of the cushion layer, a so-called bottoming phenomenon that hits the ground such as a crushed stone layer occurs when the cushion layer is thin, and the effect of providing the cushion layer becomes thin. If a thick cushion layer with a low specific gravity is used, the cushion layer is too elastic and too fluffy, and it is difficult to do exercise on it.

Further, if a cushion layer having a low specific gravity is used to solve the above drawbacks and a cushion layer having a high specific gravity is used, the cushioning effect tends to be insufficient.

Further, as described in Japanese Utility Model Publication No. 57-133374 and Japanese Utility Model Publication No. 57-133606, those provided with a cushion layer such as an uneven rubber sheet are disclosed in Japanese Utility Model Publication No. 63- In addition to the same drawbacks as those described in Japanese Patent No. 46488, unevenness in cushioning property due to unevenness makes it impossible to expect a uniform cushioning effect, and the concave portion of the rubber sheet and the convex portion of crushed stone are combined. And the cushioning effect is lost and it is dangerous.

The present invention has been made by focusing on the problems in the ground in which such a conventional sand-containing artificial grass is laid. The purpose of the present invention is to construct a conventional sand-containing artificial grass. Solving problems in the ground,
An object of the present invention is to provide a gland on which artificial turf with sand is laid, which has sufficient cushioning properties, is not too fluffy, is easy to exercise, and is expected to have a sufficient cushioning effect without unevenness.

[0008]

In order to achieve the above object, the gland on which the sand-containing artificial grass of the present invention is laid has two upper and lower cushion layers provided on the ground, and two upper and lower cushion layers. The upper layer is composed of a cushion layer having a high specific gravity, the lower layer is composed of a cushion layer having a low specific gravity, and artificial sand containing sand is laid on the upper and lower two cushion layers.

In the present invention, the ground is not particularly limited, but for example, crushed stone is laid, asphalt is laid, soil is laid, and reinforced concrete is laid. Things etc.

In the present invention, the artificial grass of the sand-containing artificial grass is not particularly limited, but for example,
It consists of a backing base cloth and pile threads with a pile length of 10 mm to 40 mm which are planted on the base cloth, and the pile threads are made of synthetic resin such as polyamide, polyethylene terephthalate, polyvinylidene chloride, polypropylene, polyethylene or acrylic resin. Can be done.

In the present invention, the cushion layer is not particularly limited, but, for example, a rubber sheet or a foamed body of synthetic resin such as polyethylene, vinyl chloride resin or polyurethane can be used.

[0012]

In the ground in which the sand-containing artificial turf of the present invention is laid, upper and lower two cushion layers are provided on the ground, and the upper and lower cushion layers are composed of high specific gravity cushion layers. Is composed of a low specific gravity cushion layer, and the sand-containing artificial grass is laid on the upper and lower two cushion layers, so the high energy generated by exercise on the ground is absorbed by the upper high specific gravity cushion layer. The high energy generated by the movement on the ground is absorbed by the upper cushion layer of high specific gravity, and the low energy is absorbed by the lower cushion layer of high specific gravity, and part of it is transmitted to the lower layer. Is transmitted to the ground, and as a result, as a whole, it is expected to have a sufficient cushioning effect, not too fluffy, easy to exercise, and a sufficient cushioning effect without unevenness.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. [Embodiment 1] FIG. 1 is a sectional view showing a part of an example of a gland on which the sand-containing artificial grass of the present invention is laid.

In FIG. 1, 1 is an upper and lower two layers 11,
It is a ground of a crushed stone layer consisting of 12, the upper layer 11 of the crushed stone layer is made of lightweight crushed stone having a particle size of 1 to 40 mm and an average specific gravity of 1.6, and the lower layer 12 has a particle size of 1 to 40 mm and an average specific gravity of 2.6. The crushed stone layer 1 has a thickness of 200 mm.

Reference numeral 2 is a cushion layer composed of upper and lower two layers 21 and 22, the upper layer 21 is a rubber-urethane sheet having a thickness of 10 mm and a specific gravity of 0.55, and the lower layer 22 is 10 mm in thickness and a specific gravity of 0.045. Of polyethylene foam sheet.

Reference numeral 3 is an artificial grass containing sand laid on the cushion layer 2. The artificial grass 3 containing sand is a backing base cloth 31.
And the sand 33 sprinkled between the nylon monofilament yarns 32 and the nylon monofilament yarns 32 having a pile length of 25 mm planted in the base fabric 31.

The hardness of the gland of the present invention as described above is determined by JI.
S. It was 33 G as a result of measurement using a hardness tester specified in A-6519. In addition, with respect to such a ground of the present invention, as a result of a test by a professional soccer player, a feeling of running, a starting dash, and a direction change, there is no wobble of the foot, a reaction is good, and a cushioning property is good
It was evaluated as relatively close to the natural grass ground.

As a comparative example, in the gland of the present invention shown in FIG. 1, upper and lower two layers 21, 2 are used as cushion layers.
Instead of using a cushion layer 2 consisting of 2, a thickness of 20
When a rubber-urethane sheet having a millimeter and a specific gravity of 0.55 is used, the hardness is JIS. It was 40 G as a result of the measurement using the hardness tester specified in A-6519.

Further, regarding such a ground of the present invention,
Test results by professional soccer players, driving feeling,
In the start dash and direction change, the legs wobble,
It was evaluated as having a fluffy cushioning property.

[Embodiment 2] FIG. 2 is a sectional view showing a part of another example of a gland on which the sand-containing artificial grass of the present invention is laid.

In the ground on which the sand-containing artificial grass of the present invention shown in FIG. 2 is laid, in the ground on which the sand-containing artificial grass of the present invention shown in FIG. , As the ground 1a, crushed stone layer 11,
The asphalt layer 13 is provided on the surface 12.

The hardness of the gland of the present invention as described above is determined by JI.
S. It was 39 G as a result of measurement using a hardness tester specified in A-6519.

Further, regarding such a ground of the present invention,
Test results by professional soccer players, driving feeling,
In starting dash and direction change, there was no wobbling of the foot, cushioning was good, and it was evaluated as relatively close to the natural grass ground.

As a comparative example, in the ground of the present invention shown in FIG. 2, upper and lower two layers 21, 2 are used as cushion layers.
Instead of using a cushion layer 2 consisting of 2, a thickness of 20
When a rubber-urethane sheet having a millimeter and a specific gravity of 0.55 is used, the hardness is JIS. As a result of measurement using a hardness tester specified in A-6519, it was 48G.

Further, regarding such a ground of the present invention,
Test results by professional soccer players, driving feeling,
In the start dash and direction change, the legs wobble,
It was evaluated as having a slightly hard cushioning property.

[Embodiment 3] FIG. 3 is a sectional view showing a part of another example of a gland on which the sand-containing artificial grass of the present invention is laid.

In the ground on which the sand-containing artificial grass of the present invention shown in FIG. 3 is laid, in the ground on which the sand-containing artificial grass of the present invention shown in FIG. 1 is laid, the ground 1 composed of crushed stone layers 11 and 12 is used. The ground 1b made of soil is provided.

[0028]

In the ground on which the artificial sand containing sand of the present invention is laid, the high energy generated by the motion on the ground is absorbed by the cushion layer having a high specific gravity of the upper layer and a part of the energy is transmitted to the lower layer. The high energy generated by the movement on the ground is absorbed by the upper cushion layer of high specific gravity, and the low energy is absorbed by the lower cushion layer of high specific gravity, and part of it is transferred to the ground. The cushioning property is sufficient, it is not too fluffy, exercise is easy to perform, and a sufficient cushioning effect without unevenness can be expected.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a part of an example of a gland on which a sand-containing artificial grass is laid according to the present invention.

FIG. 2 is a cross-sectional view showing a part of another example of the gland on which the artificial sand containing sand according to the present invention is laid.

FIG. 3 is a cross-sectional view showing a part of still another example of the gland on which the artificial grass containing sand according to the present invention is laid.

[Explanation of symbols]

 1, 1a, 1b Ground 2 Cushion layer 21 Upper layer 22 Lower layer 3 Sand-containing artificial grass 31 Base cloth 32 Pile thread 33 Sand

Claims (1)

[Claims] 1. Cushion layers of upper and lower two layers are provided on the ground, the upper layer of the upper and lower cushion layers is a cushion layer of high specific gravity, and the lower layer is a cushion layer of low specific gravity. A sand-laid artificial grass laying ground, characterized in that sand-containing artificial grass is laid on the cushion layer.