JPH0618410U - Elastic paving material - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an elastic pavement sheet having appropriate hardness and impact resilience and sufficient strength for sports performed using spike shoes. [Structure] The elastic pavement sheet of the present invention has a hardness (JIS)
Having a structure in which urethane elastomer chips of 70 to 95 are bonded to each other through a thin binder layer,
Voids are formed between the chips. [Effect] Due to the action of the voids existing between the urethane elastomer chips, while maintaining the flexibility to such an extent that the spikes are easily pierced, it has sufficient strength and exhibits appropriate shock absorption.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an elastic pavement material for paving the surface of a playground or a road, and more particularly to an elastic pavement material that provides appropriate cushioning properties when walking or running.

[0002]

[Prior art]

 In recent years, in various sports facilities, pavement materials of appropriate thickness made of organic materials have been used in place of traditional materials such as Antuca. For example, urethane-based seats having a rubber hardness (JIS) of about 40 to 60 are widely used in athletics fields, various ball sports fields, gymnasiums, and the like. In addition, a porous pavement material having voids inside has been developed in which rubber chips (rubber hardness of about 50 to 60) obtained from EPDM or waste tires are bound with a binder. In this porous pavement material, the impact resilience is weakened by the large impact energy absorption capacity of the air in the voids, which reduces the negative impact on the human body and is therefore suitable for stadium tracks and fields.

[0003]

[Problems to be solved by the device]

 However, the conventional porous pavement material has too much flexibility due to the air bubbles that exist between the rubber chips inside, and although it has less impact on the human body, it has less strength such as tearing and requires the use of special shoes. There is. Also, under conditions of use such as walking in spicy shoes such as in a golf course, it will be damaged in a short period of time and will not be usable. As a pavement material for walking paths, a rubber plate with uneven surface or a structure in which strip-shaped rubber plates are arranged in parallel is often used. Since it does not stick, it is slippery and there is a risk of falling.

An object of the present invention is to provide an elastic pavement material that has appropriate hardness and impact resilience, is suitable for many exercises and competitions, and is soft enough to be pierced by spikes and has sufficient strength against tearing. To provide.

[0005]

[Means for Solving the Problems]

 The elastic pavement material of the present invention has a structure in which voids are formed by binding urethane elastomer chips having a hardness (JIS) in the range of 70 to 95 with a binder.

[0006]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 shows an elastic paving material 1 according to an embodiment of the present invention. This elastic paving material 1 has a structure in which urethane elastomer chips 2 having a hardness (JIS) in the range of 70 to 95 are bonded to each other through a thin binder layer. The void 3 is formed.

The urethane elastomer chip 2 is made of a normal polyurethane resin synthesized by reacting an isocyanate compound and a polyol, and basically has no bubbles.

The particle size of the urethane elastomer chip 2 is arbitrarily selected depending on the physical properties of the resin and the application of the elastic pavement material 1, but generally about 1 to 5 mm is suitable.

As the binder for bonding the urethane elastomer chip 2, a rubber-based or synthetic resin-based binder generally used for adhesion of polyurethane resin, for example, urethane rubber, EVA, acrylic rubber or the like can be used. .

As a urethane elastomer chip, a chip having a hardness (JIS) of about 95 and an average particle size of about 3 mm is used. After mixing 30 parts by weight of a rubber binder with 100 parts by weight of this chip, water permeability is obtained. The surface of a base substrate made of asphalt concrete was coated with a primer to a thickness of 20 mm. The elastic pavement material thus obtained had the following properties.

Compressive force (10%): 2.0 to 4.0 kg / cm ² Tensile strength: 10.0 to 15.0 kg / cm ² Specific gravity: 0.7 to 0.9 FIG. An elastic pavement material 1 according to the example of FIG. The elastic pavement material 1 of this example has a structure in which a mixed chip obtained by mixing a urethane elastomer chip 2 and a rubber chip 4 which has not been foamed in an appropriate ratio is bonded to each other through a thin binder layer. A void 3 is formed between 2 and 4. Instead of the rubber chip 4, a non-foamed plastic chip may be used.

In actually applying the elastic pavement material 1 shown in FIG. 1 of the present invention, for example, as shown in FIG. 3, a suitable primer 5 is applied to the surface of a base substrate 6 such as water-permeable asphalt concrete. After that, a method of applying a binder to the urethane elastomer chip 2 and mixing the mixture to a predetermined thickness is adopted. Alternatively, the mixture of the urethane elastomer chip 2 and the binder may be formed into a paving sheet having a predetermined thickness in advance, and the formed paving sheet may be laid on the surface of the base substrate via a primer.

[0014]

[Effect of device]

 As described above, the elastic pavement material of the present invention has a structure in which urethane elastomer chips are bonded with a binder and has voids inside, so unlike the conventional elastic pavement material of the same type, spikes are stuck. It has a certain degree of flexibility and excellent tear strength, making it ideal as a paving material for sports performed using spiked shoes. In addition, due to the elasticity of the urethane elastomer chips themselves and the action of the voids that exist between the chips, they exert an appropriate shock absorbing property, and the risk of injury to the human body is greatly reduced.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view of an elastic paving material according to an embodiment of the present invention.

FIG. 2 is a partial vertical cross-sectional view of an elastic paving material according to another embodiment of the present invention.

FIG. 3 is a partial vertical cross-sectional view showing a state in which the elastic paving material of FIG. 1 is provided on a base substrate.

[Explanation of symbols]

 1 Elastic Pavement Material 2 Urethane Elastomer Tip 3 Void 4 Rubber Tip 5 Primer 6 Base Substrate

Claims (4)

[Scope of utility model registration request] 1. An elastic pavement material having a void structure, in which urethane elastomer chips having a hardness (JIS) of 70 to 95 are bonded with a binder. 2. The elastic paving material according to claim 1, wherein a rubber chip is mixed with the urethane elastomer chip. 3. The elastic pavement material according to claim 1, wherein the binder is a rubber binder. 4. The elastic paving material according to claim 1, wherein the binder is a synthetic resin binder.