JPH05272107A - Ground surface layer structure for indoor athletic facility - Google Patents

Abstract

PURPOSE:To improve the quality of the ground surface and reduce the cost by dispersing a glucomannan aqueous solution on the mixed soil containing tuff loam and black soil. CONSTITUTION:A crushed stone layer 4 and a water holding layer 3 of volcano gravel are laid on a ground foundation bed 5, and a surface layer section 2 of the mixed soil consisting of tuff loam, black soil, and sand is formed on it. Bittern and sand are dispersed on the surface layer section 2 for surface treatment. A glucomannan aqueous solution adjusted to the weak alkaline property is dispersed on the surface layer section 2, the aqueous solution is gelatinized in the ground to cake the surface layer section 2, and a large quantity of moisture is held. The stable ground surface can be formed, excessive drying can be prevented, and the construction cost and maintenance cost can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface structure of a ground for playing a competition in an indoor competition facility having a roof such as a dome.

[0002]

2. Description of the Related Art In recent years, even in a stadium for playing a large-area game such as baseball, soccer, or rugby, it is possible to avoid the effects of rain and wind, and even the environment for competitions and watching games in winter. An indoor competition facility with a roof such as a dome has been constructed and put into practical use so that it can be heated for comfort. By the way, regarding the ground for playing a competition in such an indoor competition facility, for example, the surface layer is Arakida soil, Masago soil,
It is known that a single soil, such as sandy loam, or a mixture of these soils, or even artificial soil called Antuca is used. Also, apart from the soil, the surface layer of natural soil such as Koryo, wild grass, and Western grass planted in mixed soil,
A surface layer portion is also known in which artificial grass made of nylon, polypropylene, polyester or the like is planted in a water-permeable mat.

[0003]

However, the conventional surface layer portion has the following disadvantages. Single soil or mixed soil has a low construction cost and is advantageous in terms of economy, but has a problem that dust is generated if the surface is not wet to some extent. In other words, because it is heated indoors, especially in winter, the ground is dry and the surface soil is also excessively dry.As the competition progresses, a part of the excessively dry surface layer becomes dust and the athletes It may hinder spectators.

The artificial soil has the same disadvantages as the single soil and the mixed soil, the construction cost is higher than that of the artificial soil, and the particles themselves are hard because they are made from the clay that is burned to make them like rugby. It is not suitable for competitions that frequently fall, as there is a risk of injury such as laceration. Natural turf has problems that maintenance costs are high, a curing period is required, and it is difficult to grow inside the stadium. With artificial grass,
Although it has excellent weather resistance, it is not suitable for rugby because it puts a heavy burden on the athlete's legs and feet and causes a lot of friction when it falls down.

The present invention has been made in view of the above-mentioned problems, and an object thereof is economically advantageous, capable of sufficiently supporting rugby, and indoors in which generation of dust etc. is prevented. To provide the surface structure of the ground in the competition facility.

[0006]

Means for Solving the Problems In the surface layer structure of the ground in the indoor sports facility of the present invention, the surface layer is made of a mixed soil containing red soil and black soil, and the aqueous glucomannan solution is sprinkled on the surface layer. Was used as a means for solving the above problems.

[0007]

According to the surface structure of the ground in the indoor sports facility of the present invention, the glucomannan aqueous solution is sprayed, so that the glucomannan is adjusted to be weakly alkaline, for example, by previously adding an alkaline solution to the aqueous solution. Is gelled and solidified, whereby the mixed soil in the surface layer portion is bonded to each other. Further, since the gelled glucomannan retains a large amount of water, even if the surface layer portion is dried, the retained water is replenished from the glucomannan, so that the surface layer portion is prevented from being excessively dried.

[0008]

The present invention will be described in detail below. FIG. 1 shows an embodiment of a ground surface layer structure in an indoor competition facility according to claim 1 of the present invention. In FIG. 1, reference numeral 1 is a ground surface layer structure. The surface layer portion 2 forming the ground surface in the surface layer structure 1 is made of a mixed soil in which red soil, black soil, and sand are uniformly mixed in a weight ratio of, for example, red soil: black soil: sand = 3: 2: 5.

A water retaining layer 3 made of volcanic gravel is disposed below the surface layer 2, a crushed stone layer 4 is disposed below the water retaining layer 3, and a ground base 5 is further disposed below the crushed stone layer 4. Has become. The water retention layer 3 is made up of volcanic gravel having a particle size of 25 mm or less, and retains water due to the physical properties of each gravel and allows water to pass between the gravel. The crushed stone layer 4 is formed of stone having a particle size of 40 mm or less, has sufficient water permeability, and is for stabilizing the water retaining layer 3 and the surface layer portion 2. In the surface layer structure 1 of such a ground, the surface layer portion 2 has a layer thickness of about 100 mm, and the water retaining layer 3 has a layer thickness of about 150 mm.
The layer thickness of the crushed stone layer 4 is about 150 mm.

Further, in the surface layer structure 1, bittern (nigari) and makeup sand are sprinkled on the surface of the surface layer portion 2 as a surface treatment. Since the bitter juice is an aqueous solution containing salts such as magnesium chloride, when it is sprayed on the surface of the surface layer 2, it evaporates more slowly than water, thus preventing excessive drying of the surface of the surface layer 2 and When it penetrates into No. 2, it acts like the salt in the mixture, and functions as a binder between the soils forming the surface layer 2. The makeup sand is sprinkled according to the surface characteristics required for the sporting event to be performed on the ground, or simply for improving the appearance of the ground surface. It should be noted that the spraying amount and spraying frequency of the bitter juice (nigari) and makeup sand for such surface treatment are appropriately determined according to the surface condition of the surface layer portion 2 and the like.

Further, in the present invention, in addition to the surface treatment by spraying the bitter juice (nigari) and the cosmetic sand, an aqueous glucomannan solution which has been adjusted to be weakly alkaline by previously adding an alkaline aqueous solution is sprayed on the surface of the surface layer portion 2. It Glucomannan is present as mucoid particles in the corm of konjac potato, which is a plant of the family Araceae, and is a polymer in which glucose and mannose (C6H10O5) are linked in a molar ratio of β-1,4. Is a special complex polysaccharide. Then, an acetyl group slightly present as a side chain in the molecule is eliminated by the action of an alkali, and a chain glucomannan molecule forms a network structure associated body by a hydrogen bond to gel.
It has an excellent water-retaining ability that includes water several hundred times its own weight.

The aqueous solution of glucomannan is not particularly limited, but a solution in which glucomannan is dissolved by about 0.2% by weight is suitable. Also,
The method of spraying the aqueous solution is not particularly limited, and an appropriate means such as a method of spraying with a water sprinkler or a method of spraying with a hose may be used. Although the amount of spraying varies depending on the concentration of the aqueous solution, for example, in the case of the above 0.2% by weight aqueous solution, it is preferably about 0.2 liter per 1 m3 of the surface of the surface layer portion 2.

When the aqueous solution permeates into the surface layer portion 2 by such spraying, the glucomannan is adjusted to be weakly alkaline so that it reacts with the alkaline component to gel and solidify, and along with this, the aqueous solution. Holds a large amount of water inside.

In such a ground surface layer structure 1, the aqueous glucomannan solution is sprinkled, so that the glucomannan reacts with the previously added alkali to gel and solidify, thereby mixing the surface layer portion 2. The soils stick to each other and form a stable ground plane. Further, since the gelled glucomannan retains a large amount of water, even if the surface layer portion 2 is dried, the retained water is replenished from the glucomannan to prevent excessive drying, and thus the surface layer portion 2 is dried. It is possible to avoid the inconvenience that dust is generated.

Although sufficient moisture and caking can be imparted to the surface layer portion 2 by spraying the glucomannan aqueous solution, the sufficient effect is maintained for about one week, so that it can be permanently applied. In order to be effective, it is preferable to spray once or twice a week. After spraying, especially when there is a risk of excessive drying on the surface layer 2, glucomanganese can retain sufficient water again by simply sprinkling a small amount of water, whereby the surface layer 2 is in a wet state. Therefore, it is possible to reliably prevent the generation of dust. In addition, although the glucomannan aqueous solution was adjusted to be alkaline in advance in the above-described examples, an alkaline aqueous solution may be sprayed separately from the glucomannan aqueous solution, and the glucomannan in the surface layer portion 2 may be reacted with the alkali in a contact reaction.

[0016]

As described above, the surface layer structure of the ground in the indoor competition facility of the present invention is formed by spraying an aqueous solution of glucomannan. Therefore, the glucomannan is added to the aqueous solution in advance with an alkaline solution. By adjusting it to be weakly alkaline, it reacts with the alkali content and gels and solidifies, which causes the mixed soil in the surface layer to stick to each other and form a stable ground surface, making it suitable for rugby, soccer, and other intense exercise. It will be a sufficient response. Further, since the gelled glucomannan retains a large amount of water, even if the surface layer portion is dried, the retained water is replenished from the glucomannan, so that the surface layer portion is prevented from being excessively dried. Therefore, for example, even if the surface of the ground is dried by heating, the surface layer does not excessively dry, so that the generation of dust due to the drying of the surface layer does not occur, and therefore the obstacle due to the dust at the time of competition at the ground or watching it Can be eliminated. Moreover, since the surface layer is made of natural material, both construction and maintenance costs are low, which is economically advantageous. Further, since the surface layer portion is made of a natural material, there is no fear of deterioration and the like, there is no large friction, and the material is softer than Antuca, so that the risk of injury such as laceration when it falls is reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a surface layer structure of a ground in an indoor competition facility according to claim 1 of the present invention.

[Explanation of symbols]

 1 Ground surface layer 2 Surface layer 3 Water retaining layer 4 Crushed stone layer

Claims (1)

[Claims] 1. A surface structure of a ground for playing a competition in an indoor competition facility having a roof such as a dome,
A surface layer structure of a ground in an indoor competition facility, characterized in that the surface layer portion is made of a mixed soil containing red soil and black soil, and the surface layer portion is sprayed with an aqueous glucomannan solution.