JP2850735B2 - Artificial grass ground and tennis court - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial turf ground and a tennis court, which are obtained by regenerating an artificial turf ground containing sand having a hardened surface, and which have extremely excellent repulsion characteristics.

[0002]

2. Description of the Related Art Conventionally, in order to give a soft feel close to a natural lawn and to suppress repulsion of a golf ball, it has been conventionally necessary to laminate a new sand-containing artificial lawn in two steps.
-59243.

[0003]

However, in a ground in which such a new artificial grass containing sand is laminated in two layers, the resilience of the tennis ball is extremely poor, with a coefficient of restitution of 0.45 or less, and tennis play itself cannot be performed. It was just something.

[0004] In view of the drawbacks of the prior art, the present invention provides
An object of the present invention is to provide an artificial turf ground, particularly a tennis court, in which the resilience characteristics of a tennis ball are extremely excellent and the appearance is excellent.

[0005]

The present invention employs the following configuration to achieve the above object. That is, the artificial turf ground of the present invention is measured by a Proctor Needle tester on an artificial turf structure in which an artificial turf B with sand is laid on an artificial turf A with sand laid on a base. The surface hardness of the artificial turf A with sand is 50 pounds or more, and the artificial turf B with sand is 40 pounds or less. Further, the tennis court of the present invention is constituted by an artificial grass ground comprising the above-mentioned sand-containing artificial grass, and JIS S-70
The coefficient of restitution measured according to 02 is in the range of 0.65 to 0.80.

[0006]

The present invention has been intensively studied to achieve a measure for improving the appearance and rebound characteristics of a worn-out sandy artificial grass tennis court at once without increasing the time, labor and cost. In particular, artificial grass containing sand used for tennis courts, when old, leaves of artificial grass are worn or buried in the soil. In addition to hardening the soil surface due to resinification, the appearance is impaired, and the ball bounce becomes too high,
There was a problem that slipping became easy and playing became extremely difficult. In the case where a sandy artificial lawn made of PP pile is newly installed on the base, it is about 3 to 4 years,
Unless the artificial grass is replaced, the above-mentioned problem has occurred.

According to the present invention, when such a problem is examined, when the surface hardness of a used tennis court reaches a specific hardness, a new artificial grass with sand is placed on the court (old artificial grass with sand). When laid, JIS
As a tennis court having a coefficient of restitution of about 0.7 according to S-7002, it has been determined that a court having extremely excellent rebound characteristics can be obtained.

In addition, according to this construction method, not only the aesthetic appearance can be improved, but also the old coat can be used as it is, so that the time and labor required for construction can be greatly reduced and the cost can be greatly reduced. There are advantages.

The artificial turf A and B containing sand referred to in the present invention.
The fabric or pile that constitutes can be one that is usually used in this industry, for example, nylon,
Pile yarn consisting of slit yarn of a synthetic resin film such as polyester, polyvinylidene chloride, polyurethane, polypropylene, etc., or pile yarn consisting of a monofilament yarn having a modified cross section flat yarn is planted on a synthetic resin backing base fabric. Can be used. Further, as the base, any of a permeable structure and a non-permeable structure made of a crushed stone structure, concrete, asphalt, or the like may be used, and there is no restriction on these.

In the present invention, what is important is that the surface hardness of the artificial turf A with sand, that is, the used and used solidified turf with hardened sand is 50 pounds or more when measured with a Proctor Needle tester. Preferably 60 to 10
In the range of 0 pounds. For the first time, when a new artificial grass with sand (B) is laid on such an artificial grass with sand having a specific surface hardness, an extremely excellent repulsion characteristic of a hard tennis ball can be provided. That is, for example, two artificial grass with sand
Even if the layers are laminated, the resilience characteristics of the present invention cannot be obtained. In this case, a new artificial grass with sand laid directly on the base (A)
Has a surface hardness of 40 pounds or less, preferably 20 to 40 pounds.
It is on the order of pounds, and even if a new artificial grass containing sand is laid thereon, the repulsion characteristic as described in the present invention is not obtained, and the ball does not bounce and even tennis can not be played.

The surface hardness of the artificial turf containing sand (A) of the present invention can be measured with a Proctor Needle Tester (manufactured by Seikido Co., Ltd.) shown in FIG. Hold the handle 6 of the hardness tester vertically on the soil surface 1 to be measured, and gently press it into the soil surface 1 from the penetrating needle head 2 to penetrate the penetrating needle head 2 to the 1-inch mark line (S). Continue to press in until 完全 completely penetrates the measurement surface. 7 is a compression coil spring. After the contact, the penetrating needle head 2 is gently pulled out, and the index scale (in pounds) of the scale plate 4 indicated by the cursor 5 is read. The value of this scale is the required soil hardness.

Next, the repulsion characteristics referred to in the present invention are JIS S-70
It is measured according to 02. An artificial lawn of 60 x 60 cm square with sand is laid in the frame for sand control, and a certified hard tennis ball is held at a height of 254 cm (height to the ball bottom). The rebound height (Tcm) of the ball when dropped naturally is measured, and the coefficient of restitution is determined by the following equation.

Coefficient of restitution = (T / 254) ^{1/2 As} the artificial grass ground of the present invention, the above-mentioned coefficient of restitution is preferably 0.60 to 0.85, more preferably 0.65 to 0.80, Particularly preferably 0.69 to 0.7
It should be in the range of 6, which gives the most suitable court especially for tennis play. The coefficient of restitution of the laminated ground of the two-layered artificial turf of the prior art described above is about 0.4, which is an order of magnitude lower.

The coefficient of restitution varies somewhat depending on conditions such as artificial grass design, sand, and thickness.
It is preferable to adjust the range of 0.60 to 0.85.

The artificial turf used in the present invention preferably has a pile length of 5 to 25 m in order to satisfy these conditions.
m, more preferably 15 to 19 mm.
Further, the sand to be filled is 0.15 to 1.7 mm (100 to
10 mesh), specifically, silica sand 5
No. 8 is preferred. The filling amount of such sand is proportionally filled according to the pile length. For example, 6kg / pile length 5mm
Since the filling condition of m ² is optimal, if the pile length is 25 mm, 30 kg / m ^{2 is} sprayed and filled. Such a filling amount may be in a range of about ± 10% of the optimum filling amount. By configuring the artificial grass containing sand under such conditions, a ground and a coat satisfying the above-described coefficient of restitution can be provided simply and easily.

The artificial turf with sand (A) of the present invention may be a laminate with another artificial turf containing sand, as long as it satisfies even the above-mentioned soil hardness characteristics. I don't mind. That is, it is sufficient that the coefficient of restitution after the artificial turf (B) containing sand is finally laminated is in the range of 0.6 to 0.85.

Next, the artificial turf ground with sand of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing one example. First, an artificial turf (A) 14 with sand is laid on the base 8, and an artificial turf (B) 13 with sand is laid on this.
9 and 10 are piles, and 11 and 12 are filling sands.
In the present invention, the artificial grass with sand (A) 14 in the figure is
Preferably at least 50 pounds, more preferably 60 pounds, as measured on a Proctor Needle tester as described above.
Has a specific hard surface of ~ 100 pounds,
On the other hand, the surface hardness of the artificial turf B with sand laminated thereon is characterized in that it is flexible, not more than 40 pounds. With such a combination, it is possible to provide, for the first time, a regenerated artificial turf ground having excellent repulsion. If the surface hardness of the sand-containing artificial turf (A) is too low and too soft, a suitable resilience cannot be achieved, and the coefficient of restitution of the laminated structure is preferably 0.60 to 0.60.
It cannot be adjusted to the range of 0.85. In particular, a tennis court must have a coefficient of restitution in the range of 0.65 to 0.80 among the artificial grass grounds.

[0018]

The present invention will be further described with reference to the following examples.

Example 1 An artificial turf was produced by planting a polypropylene monofilament yarn in a pile length of 15 mm using a plain polypropylene fabric having a basis weight of 100 g / m ² as a base cloth. 14 to 20 mesh = 16.8%, 20
-28 mesh = 29.1%, 28-36 mesh = 3
1.1%, 36 to 50 mesh = 19.5%, 50 to 7
Sand containing 0 mesh = 8.5% was filled to form a tennis court. The surface hardness of this tennis court measured by a Proctor Needle tester was 40 pounds, and the roller was ground to 65 pounds. The surface hardness of this tennis court after two years has hardened to 90 pounds two years later, the coefficient of restitution is 0.90, the leaves of artificial turf on the surface are frayed, and the tennis ball is too bouncy. Had become.

On this tennis court, an artificial grass containing sand under the same conditions as above was newly prepared and laid, thereby forming a tennis court having a two-layer laminated structure. The surface hardness of the artificial lawn containing sand separately prepared under the same conditions as that of the artificial grass containing fresh sand was 39 pounds by a Proctor Needle tester. Roller-rolling the two-layer laminated tennis court,
The surface hardness was adjusted to 70 pounds and the coefficient of restitution was adjusted to 0.70. The tennis court was again put to practical use and the surface hardness after two years was measured to be 80 pounds, the coefficient of restitution was 0.73,
It has been found that the state where the tennis court can be practically used is sufficiently maintained, and that the soil hardening is delayed by forming the two-layer structure.

[0021]

According to the present invention, an artificial turf ground containing used sand can be provided simply, easily, inexpensively, and rapidly with excellent repulsion characteristics and excellent aesthetics. be able to.

[Brief description of the drawings]

FIG. 1 is an example showing a cross-sectional structure of an artificial grass ground according to the present invention.

FIG. 2 is a schematic side view of a Proctor Needle tester for measuring the surface hardness of the artificial turf ground of the present invention.

[Explanation of symbols]

 1: Soil surface (artificial grass surface with sand) 2: Penetrating needle head 3: Penetrating needle shaft 4: Scale plate 5: Cursor 6: Handle 7: Compression coil spring S: 1 inch mark line 8: Base 9, 10: Pile 11 , 12: Filled sand 13: Artificial grass with sand B 14: Artificial grass with sand A

Claims (6)

(57) [Claims] 1. An artificial turf A with sand laid on a base
The artificial turf structure with sand is laid on the artificial turf B, and the surface hardness as measured by a Proctor Needle tester is 50 lbs or more for the artificial turf A for sand, An artificial grass ground, wherein B is less than 40 pounds. 2. The artificial turf A with sand has a surface hardness of 60 to 60.
The artificial grass ground according to claim 1, weighing 100 pounds. 3. The artificial grass ground according to claim 1, wherein the sand-containing artificial grass A is a laminate of two or more layers of sand-containing artificial grass. 4. The artificial turf A with sand, wherein the leaves of the artificial turf are frayed or buried in the soil.
The described artificial grass ground. 5. The artificial grass ground according to claim 1, wherein the coefficient of restitution measured according to JIS S-7002 is 0.60 to 0.85. 6. An artificial turf A containing sand laid on a base.
An artificial turf structure having sand-containing artificial turf B laid thereon has a surface hardness, as measured by a Proctor Needle tester, of which sand-containing artificial turf A is 52 pounds or more, B is 40 pounds or less, and the coefficient of restitution measured according to JIS S-7002 is 0.65
A tennis court having a range of .about.0.80.