JP2840015B2 - Elastic pavement and elastic pavement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic pavement for a sports facility, a park facility and the like, and an elastic pavement method. In more detail, omit or replace the cement concrete layer and asphalt concrete layer that are conventionally used as a base for sports facilities, park facilities, etc. At the same time as obtaining an elastic layer having an appropriate hardness.

[0002]

2. Description of the Related Art Conventionally, in various sports fields, amusement parks, park facilities, and the like, it is required to use a safe elastic pavement material in order to prevent danger. For example, a method of applying and curing room-temperature-curable urethane on a hard base such as cement concrete or asphalt concrete, or forming an elastic layer by laying a mixture of rubber granules and one-component moisture-curable urethane. Construction methods are being implemented.

[0003]

In forming these elastic layers, a crushed stone layer is provided on a subgrade, and a cement concrete layer or an asphalt concrete layer is formed thereon.
After providing a base of about 10 cm to about 10 cm, the above-mentioned rubber chip mixture or the like is applied and finished. Therefore,
Not only are these operations complicated, but after casting a cement concrete layer or asphalt concrete layer, if long-term curing time is not required, joining and integration with the upper elastic layer will be insufficient, and construction costs will be reduced. However, it has a drawback that it is too hard to be used as a base, so that when used, the tiredness and the burden on the knees and joints are large.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above various problems, the present inventors have omitted the cement concrete layer and the asphalt concrete layer conventionally used as the foundation, and By directly laying and paving the pavement material of the present invention on the crushed stone layer or the rubble stone layer on the soil, the elastic pavement rich in elasticity and without fatigue can be reduced economically while shortening the construction period. The present invention has completed an elastic pavement method and an elastic pavement which can be constructed in a practical manner.

That is, according to the present invention, after a base layer composed of a crushed stone layer and / or a rock stone layer is provided on a subgrade soil, a pavement material obtained by kneading a rubber pulverized material, an inorganic particulate material and a liquid resin binder is directly applied to the pavement material. An elastic layer having a pavement thickness of 10 to 50 mm and a spring constant of 0.5 to 3.0 t / cm is formed by laying a surface layer thereon. Spring constant is 0.5
Those having a thickness of less than t / cm are rich in elasticity, but are too soft and are not preferable as a walking feeling. On the other hand, a pavement material having a spring constant exceeding 3.0 t / cm has a low elasticity and has a hard walking feeling, which is not preferable as a pavement material required. Note that, in the present invention, a base layer composed of a crushed stone layer and / or a chestnut stone layer and a layer obtained by laying an elastic pavement material thereon are referred to as an elastic pavement.

The pulverized rubber used in the present invention is natural rubber,
Styrene butadiene rubber, acrylonitrile butadiene rubber, polyurethane rubber, ethylene propylene terpolymer or a mixture of a plurality or the like,
From the viewpoint of economy, it is preferable to use a tire obtained by crushing and grading waste tires as industrial waste. Further, the shape of the rubber pulverized product is preferably granular or a hijiki having a certain length, and the particle size of the granular material is preferably 1 mm or more, and particularly preferably 2 to 15 mm.

The inorganic particles used in the present invention include natural stones such as mountain gravel and river gravel, granules such as cold water stones, and slag, all of which play a role of adjusting hardness and supporting force. Their particle size is preferably 1 to 10 mm or more and 2 to 10 mm.

[0008] The specification of the shape of the rubber pulverized material and the inorganic granular material, and the compounding ratio thereof are determined as elasticity suitable for use as a physical education facility or a park facility of the elastic layer formed according to the present invention. This is a factor for obtaining a spring constant of 0.5 to 3.0 t / cm. That is, the pulverized material of the present invention is obtained by kneading 5 to 10% by weight of a liquid binder with respect to a mixture of the rubber crushed material and the inorganic granular material having the above-mentioned shape at a weight ratio of 1: 1 to 1: 5. Can be

As the liquid resin binder, urethane,
Room temperature-curable urethanes such as acrylate ester copolymers, ethylene vinyl acetate copolymers, and epoxy resins are used, and one-part moisture-curable urethanes and two-part room-temperature-curable urethanes are particularly preferred. .

[0010] The surface elastic pavement material thus obtained is usually paved to a thickness of 15 to 100 mm, of which 30 to 50 mm exhibits an effective elasticity, and is laid directly on the crushed stone layer. Thereby, an elastic pavement having a spring constant of 0.5 to 3.0 t / cm suitable for a physical education facility or a park facility is formed.

In the compounding ratio between the rubber pulverized material and the inorganic particulate material, the higher the proportion of the inorganic particulate material, the higher the spring constant in the present invention. If the compounding ratio exceeds 1: 5, the spring constant exceeds 3 t / cm, which is close to that of concrete pavement and exceeds the elasticity range, making it unsuitable as a physical education facility. On the other hand, when the compounding ratio of the rubber particles increases and the weight ratio exceeds the range of 1: 1, the rubber chip becomes closer to the elastic layer of the rubber chip. In this case, since the rubber chip is formed directly on the crushed stone layer, it is formed on the normal asphalt layer. Unlike the case of the above, there is a soft feeling with a large variation in the supporting force ratio, and the spring constant is 0.5t /
cm, which is also unsuitable as an elastic layer for sports facilities.

The elastic pavement material forming the surface layer according to the present invention can be used as a finished surface as it is, or a normal elastic pavement such as urethane can be applied to the surface. Also, when laying artificial turf on the pavement surface of the present invention, an elastic pavement suitable as a ground for artificial turf can be obtained.

[0013]

EXAMPLES The present invention will be described with reference to examples, but embodiments of the present invention are not limited to the following examples. In addition, parts indicate parts by weight. First, a production example of the binder used in the present invention will be described. (Production Example 1) Production of urethane binder 292 parts of purified MDI (MDI-PH, manufactured by Mitsui Toatsu), 73 parts of liquid MDI (MDI-LK, manufactured by Mitsui Toatsu) and PPG
After uniformly mixing 535 parts of DIOL-2000 (manufactured by Mitsui Toatsu Co., a polyol having a molecular weight of 2,000 with propylene oxide added to ethylene glycol), 80 ° C.
At a terminal isocyanate content of 9.0.
%, A urethane binder having a viscosity of 3000 cps (25 ° C.) was produced.

Example 1 A rubber chip 22 having a particle size of 2 to 6 mm obtained by grinding a waste tire.
4 parts, 660 parts of inorganic slag having a particle size of 3 to 5 mm, and 56 parts of the urethane binder produced in Production Example 1 were uniformly mixed in a mortar mixer, and then uniformly spread on a crushed stone layer. And an elastic layer having a thickness of 3 cm was obtained. Put the material of this elastic layer into a mold 100 × 100 ×
A test specimen having a thickness of 30 mm was prepared, and the spring constant was measured. The result was 1.622 t / cm, and the rebound resilience was 12%.
The obtained pavement material was rich in elasticity and extremely excellent in walking feeling.

Example 2 A rubber chip 28 having a particle size of 2 to 6 mm obtained by grinding a waste tire.
0 parts, 550 parts of inorganic slag having a particle size of 3 to 5 mm, and 56 parts of the urethane binder produced in Production Example 1 were uniformly mixed in a mortar mixer, and then uniformly spread on a crushed stone layer. And an elastic layer having a thickness of 3 cm was obtained. A sample of 100 × 100 × 30 mm in thickness was prepared by putting the material of the elastic layer into a mold, and the spring constant was measured to be 1.304 t / cm and the rebound resilience was 18%.
The obtained pavement material was rich in elasticity and extremely excellent in walking feeling.

Example 3 A rubber chip 33 having a particle size of 2 to 6 mm obtained by grinding a waste tire.
6 parts, 440 parts of inorganic slag having a particle size of 3 to 5 mm, and 56 parts of the urethane binder produced in Production Example 1 were uniformly mixed in a mortar mixer, and then uniformly spread on a crushed stone layer. And an elastic layer having a thickness of 3 cm was obtained. A sample of 100 × 100 × 30 mm thick was prepared by placing the material of the elastic layer in a mold, and the spring constant was measured to be 0.895 t / cm and the rebound resilience was 21%.
The obtained pavement material was rich in elasticity and excellent in walking feeling.

Example 4 224 parts of a rubber chip of 5 to 10 mm in diameter and 660 parts of inorganic slag having a particle size of 3 to 5 mm were obtained by pulverizing a waste tire.
After 56 parts of the urethane binder produced in Production Example 1 were uniformly mixed in a mortar mixer, the mixture was evenly spread on a crushed stone layer and rolled with a metal roller to obtain an elastic layer having a thickness of 3 cm. A sample of 100 × 100 × 30 mm in thickness was prepared by putting the material of the elastic layer into a mold, and the spring constant was measured to be 1.200 t / cm and the rebound resilience was 16%.
The obtained pavement material was rich in elasticity and extremely excellent in walking feeling.

Example 5 280 parts of rubber chips of 5 to 10 mm in hiji shape obtained by grinding waste tires, 550 parts of inorganic slag having a particle size of 3 to 5 mm,
After 56 parts of the urethane binder produced in Production Example 1 were uniformly mixed in a mortar mixer, the mixture was evenly spread on a crushed stone layer and rolled with a metal roller to obtain an elastic layer having a thickness of 3 cm. A sample of 100 × 100 × 30 mm in thickness was prepared by placing the material of the elastic layer in a mold, and the spring constant was measured. The spring constant was 0.888 t / cm, and the rebound resilience was 19%.
The obtained pavement material was rich in elasticity and excellent in walking feeling.

Example 6 336 parts of rubber chips of 5 to 10 mm in hiji shape obtained by pulverizing waste tires, 440 parts of inorganic slag having a particle size of 3 to 5 mm,
After 56 parts of the urethane binder produced in Production Example 1 were uniformly mixed in a mortar mixer, the mixture was evenly spread on a crushed stone layer and rolled with a metal roller to obtain an elastic layer having a thickness of 3 cm. A sample of 100 × 100 × 30 mm in thickness was prepared by putting the material of the elastic layer into a mold, and the spring constant was measured. The spring constant was 0.750 t / cm, and the rebound resilience was 25%.
The obtained pavement material was rich in elasticity and excellent in walking feeling.

Example 7 168 parts of a rubber chip having a size of 5 to 10 mm obtained by pulverizing a waste tire, 770 parts of an inorganic slag having a particle size of 3 to 5 mm,
After 56 parts of the urethane binder produced in Production Example 1 were uniformly mixed in a mortar mixer, the mixture was evenly spread on a crushed stone layer and rolled with a metal roller to obtain an elastic layer having a thickness of 3 cm. A sample of 100 × 100 × 30 mm thick was prepared by putting the material of this elastic layer into a mold, and the spring constant was measured. The measured value was 2.000 t / cm, and the rebound resilience was 8%. The obtained pavement material had elasticity and was excellent in walking feeling.

Example 8 A rubber chip 28 having a particle size of 2 to 6 mm obtained by grinding a waste tire.
0 parts, 560 parts of natural stone having a particle size of 4 to 6 mm, and 56 parts of the urethane binder produced in Production Example 1 are uniformly mixed in a mortar mixer, and then uniformly spread on a crushed stone layer. To obtain an elastic layer having a thickness of 3 cm.
The material of this elastic layer is put into a mold and 100 × 100 × thickness 30
0.88 mm was measured and the spring constant was measured.
It was 8 t / cm and the rebound resilience was 20%. The obtained pavement material was rich in elasticity and excellent in walking feeling.

Comparative Example 1 A mortar of 80 parts of a rubber chip having a size of 5 to 10 mm obtained by pulverizing a waste tire, 880 parts of an inorganic slag having a particle size of 3 to 5 mm, and 56 parts of a urethane binder produced in Production Example 1 was used. After being uniformly mixed in the mixer, the mixture was evenly spread on the crushed stone layer and rolled with a metal roller to obtain an elastic layer having a thickness of 3 cm. Put the material of this elastic layer into a mold 100 × 100 ×
A specimen having a thickness of 30 mm was prepared, and the spring constant was measured. As a result, it was 3.210 t / cm, and the rebound resilience was 4%. The obtained paving material had low elasticity, and the walking feeling was hard.

Comparative Example 2 A rubber chip 40 having a particle size of 2 to 6 mm obtained by grinding a waste tire.
0 parts, 300 parts of natural stone having a particle size of 4 to 6 mm, and 56 parts of the urethane binder produced in Production Example 1 are uniformly mixed in a mortar mixer, and then uniformly spread on a crushed stone layer. To obtain an elastic layer having a thickness of 3 cm.
The material of this elastic layer is put into a mold and 100 × 100 × thickness 30
mm was prepared and the spring constant was measured.
It was 5 t / cm and the rebound resilience was 32%. The obtained pavement material was rich in elasticity, but the walking feeling was too soft and unnatural. Table 1 shows the physical property test results of Examples 1 to 8 and Comparative Examples 1 and 2.

[0024]

[Table 1] (*) SB resilience A 1-inch iron ball is dropped from a height of 1 m and the rebound height is read. (**) Spring constant This was performed according to the static spring constant test of JIS K6385. The size of the specimen is 100 × 100 × 30 mm (thickness). (***) Walking feeling ◎ It is rich in elasticity and extremely excellent in walking feeling. ○ High elasticity and excellent walking feeling. △ Good elasticity and good walking feeling. × Low elasticity and hard walking feeling. Or, it is rich in elasticity, but the walking feeling is too soft.

[0025]

According to the elastic pavement material and the elastic pavement method of the present invention, the pavement material of the present invention is directly laid and laid on a subgrade soil or a rubble stone layer to provide elasticity. It is possible to economically construct a safe and elastic pavement free of fatigue while shortening the construction period, and it is possible to omit the cement concrete layer and the asphalt concrete layer conventionally used as the foundation.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshihide Ishihara 4-53-3, Hirorobu-cho, Chuo-ku, Osaka, Osaka Inside Oku Antucar Co., Ltd. (72) Tsuneo Kato 4-5-5-Hakurocho, Chuo-ku, Osaka, Osaka No. 3 Oku Antucar Co., Ltd. (56) References JP-A-4-302603 (JP, A) JP-A-54-39922 (JP, A) JP-A-2-289702 (JP, A) JP 4-302604 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E01C 13/00 C08L 31/04 C08L 63/00 C08L 75/00

Claims (10)

(57) [Claims] 1. An elastic layer on the surface comprising at least a rubber pulverized material, an inorganic particulate material and a liquid binder, and an elastic pavement material having a spring constant of 0.5 to 3.0 t / cm.
An elastic pavement comprising a base layer consisting of a crushed stone layer or a chestnut stone layer and obtained by laying an elastic layer on the surface directly on the base layer. 2. The particle size or length of the ground rubber material is 1 mm or more, the particle size of the inorganic granular material is 1 mm or more, and the mixing ratio of the ground rubber material and the inorganic granular material is 1: 1 by weight. ~ 1 to 5
The elastic pavement according to claim 1, wherein the liquid binder is 5 to 10% of the total value of the pulverized rubber material and the inorganic particulate material. 3. The elastic pavement according to claim 1, wherein the pavement thickness of the elastic layer is 1 to 5 cm. 4. The elastic pavement according to claim 1, wherein artificial turf is laid on the elastic layer. 5. The elastic pavement according to claim 1, wherein the liquid binder is urethane, an acrylate copolymer, an ethylene-vinyl acetate copolymer, or an epoxy resin. 6. A pavement material containing at least a pulverized rubber material, an inorganic particulate material, and a liquid binder is directly spread on a base layer comprising a crushed stone layer or a chestnut stone layer to obtain 0.5 to 3.0 t.
An elastic pavement method comprising forming an elastic layer having a spring constant of / cm on a surface of a base layer. 7. The particle size or length of the ground rubber material is 1 mm or more, the particle size of the inorganic granular material is 1 mm or more, and the mixing ratio of the ground rubber material and the inorganic granular material is 1: 1 by weight. ~ 1 to 5
7. The elastic pavement method according to claim 6, wherein the liquid binder is 5 to 10% of the total value of the pulverized rubber material and the inorganic particulate material. 8. The elastic pavement method according to claim 6, wherein the pavement is an elastic layer having a thickness of 1 to 5 cm. 9. The method according to claim 6, wherein an artificial turf is laid on the elastic layer. 10. A liquid binder comprising: urethane, an acrylate copolymer, an ethylene-vinyl acetate copolymer,
7. The elastic pavement method according to claim 6, which is an epoxy resin.