JP2704240B2 - Cushionable roadbed material having water permeability, walking path, stadium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a footpath, a cushioned roadbed material for a stadium, and a footpath or a stadium using the same, which is suitable for a roadbed and has excellent water permeability and excellent cushioning properties. In particular, racetracks, training grounds, racehorse breeding grounds, soccer fields, baseball fields, American football fields, hockey fields, tennis fields, athletic fields, poolside walking paths, and cushioned roadbed materials for track tracks in athletic fields And a walking path or a stadium using the same.

[0002]

2. Description of the Related Art Generally, the structure of a walking path or a stadium is made of a base material such as ascon, concrete or crushed stone, a surface material such as rubber chips, urethane chips, or water-permeable asphalt. Ascon, concrete, and crushed stone are used as roadbed materials. These roadbed materials are relatively easy to maintain on a daily basis.

However, a walking path or a stadium using these roadbed materials has the following disadvantages. 1) Since the roadbed itself has no water permeability, even if the surface material has water permeability, rainwater accumulates on the surface material at the time of rainfall or after rainfall, and a great expense is required for ground maintenance. 2) Furthermore, in winter, the surface material freezes because it contains water, and the competition must be stopped. In order to prevent this freezing, a great deal of cost and labor is required for ground maintenance, such as hanging a seat at night and spraying salts such as calcium chloride. 3) The elasticity of the surface material is insufficient depending on the type of the game, and the thickness of the surface material must be changed in order to impart the elasticity, and there is a problem in the construction cost.

Further, in order to solve the above-mentioned problem, there is, for example, a product in which beads of expanded polystyrene are solidified with an adhesive to form a block, but the strength, particularly the impact resistance, is poor, and the durability is serious.

[0005]

Means for Solving the Problems The present inventor has proposed a step path for a walking path and a stadium which has excellent water permeability and provides appropriate cushioning properties and has water permeability which is durable against impacts in various sports and the like. As a result of intensive studies to obtain a cushioning roadbed material,
The present invention has been reached.

That is, the present invention relates to a molded product obtained by thermally fusing columnar synthetic resin foam particles, wherein the molded product has a water permeability of 1.0 × 10 ⁻² cm / sec or more, It is a cushioned roadbed material, a footpath, and a stadium having an impact acceleration of 10 to 200 G by a test and a porosity of 5 to 50% and having water permeability.

[0007] The hydraulic permeability of the cushioned roadbed material of the present invention for walking paths and stadiums is usually 1.0 × 10 ^-2 c.
m / sec or more. If it is less than 1.0 × 10 ⁻² cm / sec, puddles are observed on the walking path and the surface of the stadium during and after the rain, and in winter, the walking path and the surface of the stadium are frozen.

The impact acceleration of the cushioning roadbed material having a water permeability according to the present invention for stepped roads is usually 5 by a weight drop test.
~ 200G. When used as a roadbed on a footpath of a racetrack, a training ground, a racehorse breeding ground, preferably 30 to
150G, particularly preferably 50-120G. Even if it is less than 5G, even if it exceeds 200G, an appropriate cushioning property cannot be obtained, and the running property is deteriorated. When used as a roadbed on a soccer field, a baseball field, an American football field, a hockey field, a tennis field, an athletic field, or a poolside walkway, the speed is preferably 10 to 80 G, particularly preferably 20 to 60 G. Even if it is less than 5G or more than 200G, an appropriate cushioning property cannot be obtained, and the exercise characteristics deteriorate. The impact acceleration by the weight drop test of the cushioned roadbed material for stadiums having water permeability of the present invention is usually 5 to 1
00G. Preferably it is 10-80G, especially preferably 20-60G. 100G even if less than 5G
Even if it exceeds, moderate cushioning property cannot be obtained, and running performance is deteriorated.

The shape of the synthetic resin foam used for the stepped path having water permeability and the cushioning roadbed material for the stadium of the present invention is preferably substantially columnar, but other shapes such as spherical are also used. May be. As the synthetic resin that can be used for the step path having water permeability of the present invention and a cushioning material for a stadium, a synthetic resin having a low water absorption rate is preferable, for example, a polypropylene resin, a polyethylene resin, a silicone resin, a urethane resin,
Styrene-based and polybutene-based resins, and a combination of two or more of these resins. Of these, preferred are polypropylene, polyethylene, silicone and urethane. The water absorption of the synthetic resin foam particles is usually 5
% Or less. If the water absorption exceeds 5%, obstacles such as freezing of the surface material and the roadbed in winter are caused.

[0010] The porosity of the cushioned roadbed material of the present invention for use in walking paths and stadiums having water permeability is usually 5 to 50%.
Preferably it is 5 to 30%. If the porosity is less than 5%,
The desired water permeability cannot be obtained, and if it is more than 50%, the cushioning properties are too good, and the running property is poor.

The apparent density of the synthetic resin foam particles used for the water-permeable footpath and the cushioning base material for the stadium of the present invention is usually 0.01 to 0.35 g / cm ³ .
Preferably it is 0.02-0.3 g / cm < ³ >. Apparent density foaming ratio less than 0.01 g / cm ³ and 0.35
If it exceeds g / cm ³ , the desired cushioning property cannot be obtained, and molding becomes difficult.

Examples of the penetrant used for the water-permeable footpath and cushion-type roadbed material for stadiums of the present invention include sodium dioctylsulfosuccinate, polyoxyethylene alkyl ether, sodium dodecylbenzenesulfonate, sodium alkylnaphthalenesulfonate. And hydrophilic surfactants such as sulfated butyl oleate. Particularly preferred are sodium dioctyl sulfosuccinate, polyoxyethylene alkyl ether and the like. As a treatment method using the above-described penetrating agent, an aqueous solution of a chemical is applied after molding, applied by spraying, dipping, or the like, and then dried.

There are no particular restrictions on the shape and size of the water-permeable footpath and cushioned roadbed material for the stadium of the present invention, and any shape may be used as long as it can be put to practical use. Considering the ease of construction, usually 90-120cm (length) x 120-1
A plate shape of 80 cm (width) × 2 to 6 cm (thickness) is preferable.

Further, the step path having water permeability according to the present invention,
Additives such as a coloring agent such as a pigment, an ultraviolet absorber, and an antioxidant may be added to the cushioned roadbed material for the stadium as long as various characteristics required for the roadbed material are not hindered.

[0015] As a construction method of a walking path or a stadium using the water-permeable cushion material of the present invention, for example, a roadbed material of the present invention is laid on a roadbed, and a primer is applied on the roadbed material. A method of applying a surface material such as a rubber chip, a urethane chip, and water-permeable asphalt to a thickness of 10 to 15 mm is exemplified.

[0016]

EXAMPLES The present invention will be further described with reference to examples below, but the present invention is not limited to these examples. Example 1 A foamed molded product (90 cm × 120 cm × 3 cm) described in Example 1 of JP-A-3-224727 was prepared by using sodium dioctylsulfosuccinate [Sanyo Chemical Industry Co., Ltd.]
Manufactured by Sanmorin OT-70; 70% solution of active ingredient] for 2 hours, and then dried with a normal-temperature dryer at 60 ° C to provide a water-permeable footpath and cushioning property for a stadium. The roadbed material (1) was obtained.

Example 2 A foam molded article (90 cm) described in Example 6
× 120 cm × 3 cm) in a 1% dilute solution of polyoxyethylene decanol [Sanmorin 11 manufactured by Sanyo Chemical Industries, Ltd .; 60% solution of active ingredient] for 2 hours, and then a normal air dryer at 60 ° C. To obtain a cushioned roadbed material (2) for a walking path and a stadium having water permeability.

Construction Example 1 A step path and a stadium track base material (1) were applied to a step path of a racetrack at a thickness of 3 cm to obtain a test step path (A). As a surface material, a rubber chip pavement material was applied with a thickness of 15 mm.

Construction Example 2 A step path and a stadium roadbed material (2) were applied to a step path of a racetrack at a thickness of 3 cm to obtain a test step path (B). As a surface material, a rubber chip pavement material was applied with a thickness of 15 mm.

Comparative Example 1 A comparative walking path and a stadium (3) were obtained from concrete.

COMPARATIVE EXAMPLE 2 Spherical polystyrene foam particles were fixed with an adhesive to obtain a comparative walking path and a stadium (4).

Comparative Construction Example 1 A step path and a stadium roadbed (3) were constructed on a step path of a racetrack with a thickness of 10 cm to obtain a test step path (C). As a surface material, a rubber chip pavement material was applied with a thickness of 15 mm.

Comparative Construction Example 2 A step path and a stadium course material (4) having a thickness of 5 cm were constructed on a step path of a racetrack to obtain a test step path (D). As a surface material, a rubber chip pavement material was applied with a thickness of 15 mm.

Working Examples, Working Examples and Comparative Examples, Comparative Working Examples Cushioned roadbed materials (1) for walking paths and stadiums according to the present invention,
(2) and the hydraulic conductivity of the roadbed materials (3) and (4) for comparison,
Impact acceleration, porosity, apparent density,
Table 1 shows the water absorption and the respective numerical values after compaction 900 times. In addition, the step path having water permeability of the present invention, a test step path using a cushioning base material for a stadium (A),
Table 2 shows the values of the water permeability and the gravitational acceleration obtained by the weight drop test one month, three months, and six months after the construction of (B) and the comparative test steps (C) and (D). -In Tables 1 and 2 indicates that measurement could not be performed.

[0025]

[Table 1]

Note 1) The measurement of hydraulic conductivity is based on JIS-A-1
The test was performed according to 200 variable water permeability tests. Note 2) The weight drop test is based on JIS-K-7221.
The impact acceleration was measured when a weight of 2 kg with an accelerometer was dropped vertically from a height of 80 cm. Note 3) Measurement of porosity is 50 mm x 50 mm x 50 mm
The apparent volume of the test piece was defined as Vocm ^3, and the volume increased when the test piece was immersed in ethanol was determined as Vicm ^{3 by the} following equation. Void amount = {(Vo−Vi) / Vi} × 100 Note 4) The apparent density was measured according to JIS-K-6767. Note 5) The water absorption was measured in accordance with JIS-K-6767. Note 6) The compaction test 900 times is 10 cm (length) x 10
The test roadbed material was put into an iron mold of cm (width) × 20 cm (height), and then compacted 900 times.

[0027]

[Table 2]

[0028]

The present invention has the following effects. (1) Since the stepping path and the roadbed material for stadiums of the present invention have good water permeability over a long period of time, rainwater and the like do not collect on the stepping path and the surface of the stadium during rainfall and after rain, and in winter. The walking path and the stadium do not freeze. (2) The footpaths and stadiums of the present invention have good cushioning properties over a long period of time, so that even if the surface material does not have sufficient cushioning properties, the footpaths and stadiums suitable for various exercises and competitions I will provide a.

[Brief description of the drawings]

FIG. 1 is a sectional view of a walking path and a stadium according to the present invention.

[Explanation of symbols]

 1 Surface material 2 Roadbed material

 ──────────────────────────────────────────────────続 き Continuation of the front page Examiner Yoshiko Arai (56) References JP-A-3-224727 (JP, A)

Claims (8)

(57) [Claims] 1. A molded product obtained by thermally fusing columnar synthetic resin foam particles, and having a water permeability of 1.0 × 10
^-2 cm / sec or more, the impact acceleration by a weight drop test is 5 to 200 G, and the porosity is 5 to 50 G
% Of cushioning roadbed material for stepped roads. 2. The walking path selected from the group consisting of a racetrack, a training ground, a racehorse breeding ground, a soccer field, a baseball field, an American football field, a hockey field, a tennis field, an athletic field and a poolside. The cushioning roadbed material according to claim 1, which is a stepped path. 3. A molded product obtained by heat-sealing the columnar synthetic resin foam particles, and the molded product has a water permeability of 1.0 × 10 3.
⁻² cm / sec or more, the impact acceleration by a weight drop test is 5 to 100 G, and the porosity is 5 to 50 G.
% Cushioning roadbed material for stadiums. 4. The cushioned roadbed material according to claim 3, wherein the stadium is a track of an athletics stadium. 5. The cushioning roadbed material according to claim 1, wherein the synthetic resin foam particles have an apparent density of 0.01 to 0.35 g / cm ³ . 6. The cushioning roadbed material according to claim 1, wherein the synthetic resin foam particles have a water absorption of 5% or less. 7. The cushioning roadbed material according to any one of claims 1 to 6, wherein the molded product is a product treated with a penetrant after molding. 8. A walking path or a stadium comprising a combination of the cushioning roadbed material according to claim 1 and a surface material selected from the group consisting of rubber chips, urethane chips and water-permeable asphalt.