JPH05184240A - Golf course - Google Patents

Abstract

PURPOSE:To provide a golf course containing plane heaters having insulation water-proofing coating and embedded in the ground, having easily controllable temperature, free from freezing even in winter season and effective also for the growth of lawn. CONSTITUTION:A plane heater 1 coated with an insulating water-proofing coating is embedded in the ground of a golf course. A plane heater having especially easily controllable temperature can be produced by kneading carbon black into a crystalline thermoplastic resin in dispersed state and attaching electrodes to the obtained semiconducting sheet or film. The water-proofing coating is preferably a sheet made of a mixture of rubber and asphalt reinforced with a nonwoven cloth, etc., filled in the sheet. The crystalline thermoplastic resin is preferably an acid-modified polyethylene, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf course which can be easily controlled in temperature and does not freeze in winter.

[0002]

2. Description of the Related Art Generally, as a means for preventing the freezing of the surface portion of a civil engineering structure such as a golf course in the winter, 1) a pipe such as a water passage pipe is buried in the ground, and hot water is added. Method of heating by passing a heating medium such as 2), 2) Method of burying linear resistance heating element in a plane while repeatedly meandering and heating by energizing heat generation, 3) Heating by spraying hot water at appropriate time Method, etc. are adopted.

[0003]

In the above-mentioned existing method, in the method 1), it is necessary to lay a water pipe for carrying the heating medium for heating to the destination of heating, and for the heating medium separately. It is necessary to establish a heat source supply base for the above, and the construction cost for both will be enormous. Furthermore, when trying to control the heating temperature in the heating section in response to changes in the ambient temperature, it becomes a combination of controlling the flow rate of the heating medium, controlling the heating degree, etc. Absent.

In the method 2), the resistance heating wire laid in a meandering pattern is easily moved due to the earth pressure during the burying work, so that it is not possible to bury the repetitive meandering width uniformly and the planar temperature distribution in the soil surface layer portion becomes uneven. Become. Therefore, it is not possible to specify the optimum installation location of the temperature sensor installed for the purpose of controlling the temperature of the soil surface layer, and the control is inevitably coarse.

In the method of 3), since hot water is sprayed at appropriate times, the earth and sand flow out in the soil structure embedded with only earth and sand,
Totally unsuitable.

[0006]

In view of the above situation, the present inventor has made earnest studies as to a heating method without the above-mentioned drawbacks, and as a result, heats a sheet heating element covered with an insulating and waterproof coating. The present invention has been completed by finding that a golf course can be obtained by burying it in an appropriate soil site, the temperature can be easily controlled, it does not freeze in winter, and the lawn can be effectively grown.

[0007] That is, the present invention provides a golf course characterized by embedding a sheet-like heating element having an insulating and waterproof coating. The sheet-like heating element coated with insulation and waterproof used in the present invention is, for example, a sheet-like heating element in which a semiconductive coating material is applied on a plastic sheet or film having a high insulation resistance as a base material and electrodes are provided. Insulation made of thermoplastic resin, rubber, asphalt, etc. is applied to a sheet-like heating element, etc., in which a semi-conductive film or sheet is prepared by kneading and dispersing conductive powder etc. in the body Examples include those with a coating and a waterproof coating. These coatings may be formed by laminating a waterproof coating on an insulating coating or a coating having both insulating and waterproof properties.

Among the above-mentioned sheet heating elements, those having electrodes on a semiconductive sheet or film prepared by kneading and dispersing conductive powder or the like in a crystalline thermoplastic resin have a positive temperature coefficient of resistance. That is, the resistance increases as the temperature rises, and the temperature does not rise above a certain temperature,
Temperature control is particularly easy and preferable, and particularly, one having a maximum temperature of 5 to 40 ° C. when energized to generate heat under the condition of 0 ° C. is preferable.

Examples of the crystalline thermoplastic resin used here include polyethylene resin, polypropylene resin, polyamide resin, polybutylene terephthalate resin, and the like. Among them, the adhesiveness with a metal electrode is particularly high. Acid-modified polyethylene, acid-modified polypropylene, and ionomer resin are preferable from the viewpoint of superiority.

Examples of the conductive powder and the like include conductive powders such as carbon black, copper powder, and stainless powder, and conductive fibers such as carbon short fibers and stainless fibers.
Of these, carbon black is preferred.

Examples of the electrode include metal foil such as copper foil, twisted wire made of various metals, and braided wire. Examples of the insulating coating include those made of plastic, rubber, asphalt, etc. as described above, and are not particularly limited, but a sheet or film made of electrically insulating plastic is usually used. Among them, in the case of the sheet heating element having the positive resistance coefficient, if a sheet or film made of the same kind as the crystalline thermoplastic resin used for this is used, the adhesiveness with the sheet heating element is good. preferable.

Examples of the waterproof coating include various thermoplastic resins, natural rubber, synthetic rubber, rubber-asphalt mixture and the like formed into a sheet or film.
Thickness 2 consisting of a mixture of rubber such as BR and asphalt
A 7 mm sheet-like material is preferable because it is inexpensive and has excellent on-site workability and protective coverage. Among these, a sheet of the rubber-asphalt mixture internally reinforced with a non-woven fabric or the like is particularly preferable in terms of excellent durability after construction.

[0013]

In the golf course of the present invention, since the sheet heating element covered with an insulating and waterproof coating is used, it can be uniformly embedded in the course, the temperature can be easily controlled, and the outflow of earth and sand does not occur. Above all, if a sheet heating element having a positive temperature resistance coefficient is used, it is safe because the temperature does not rise above a certain temperature.
Especially, the temperature control is easy, and the root of the lawn is not damaged by excessive temperature rise, and it is also effective for lawn cultivation.

[0014]

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a cross-sectional view showing an example of the golf course of the present invention, and FIG. 2 is a partially cutaway perspective view showing an example of the structure of an insulating and waterproof coated sheet heating element used in the golf course of the present invention.

In FIG. 1, 1 is a sheet-like heating element covered with an insulating and waterproof coating, 2 is a temperature sensor, 3 is a current controller, 4 is lawn, 5 is soil, and 6 is semiconductive in FIG. Sheet, 7 is an electrode, 8 is a lead wire for energization, 9 is a caulking metal fitting for joining the electrode 7 and the lead wire 8, 10 is an insulation coating, 1
1 is a waterproof coating.

In order to obtain the golf course of the present invention, as shown in FIG. 1, the sheet-like heat generating element 1 having an insulation coating may be embedded under the lawn 4 of the golf course. For example, the sheet-like heating elements 1 whose energization temperature (maximum exothermic temperature at 0 ° C) has been confirmed by energizing in advance are laid flat at appropriate intervals so that the temperature of the surface layer portion of the course is uniform, Soil 5 should be piled up in the thickness and embedded.

Usually, the thickness of the soil 5 which is filled up with the sheet heating element 1 is related to the growth of the root of the lawn 4 to be planted on the surface, the necessity of inserting tea into this soil, and the addition of the soil surface layer. Considering the temperature effect, a thickness of 5 to 30 cm is suitable.

In addition, when heating, it is preferable to incorporate a temperature sensor and perform circuit control so that heating can be performed with a small amount of electric power as much as possible, but the position of the sensor may be anywhere directly above the planar heating element, and its depth. More preferably, the depth is 5 to 10 cm from the surface layer.

The reason is that it is preferable to put a temperature sensor on the surface of the ground where freezing first starts when the purpose is merely to prevent freezing, but it also promotes the growth of the root of the lawn in winter. For the purpose, it is necessary to maintain the temperature of the root of the lawn at a ground temperature of 5 to 6 ° C or higher at which the activity of the root is activated, and 5 to 10 cm from the surface where most of the root is located.
This is because it will be more effective to place a temperature sensor in the area of.

[0020]

Since the golf course of the present invention uses the sheet heating element with the insulation and waterproof coating, it can be evenly embedded in the course and the temperature can be easily controlled. It does not hurt the roots and is effective for growing lawns.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a golf course of the present invention.

FIG. 2 is a partially cutaway perspective view showing an example of the structure of an insulating / waterproof sheet heating element used in the golf course of the present invention.

[Explanation of symbols]

 1 Insulating waterproof coated sheet heating element 2 Temperature sensor 3 Energization controller 4 Lawn 5 Soil 6 Semi-conductive sheet 7 Electrode 8 Conductive lead wire 9 Caulking metal fitting 10 Insulation coating 11 Waterproof coating

Claims (6)

[Claims] 1. A golf course comprising a sheet-like heating element covered with an insulating and waterproof coating. 2. The golf course according to claim 1, wherein the sheet heating element has a positive temperature coefficient of resistance. 3. The golf course according to claim 2, wherein the maximum heat generation temperature of the planar heating element at an ambient temperature of 0 ° C. is 5 to 40 ° C. 4. The embedding depth of the planar heating element is 5 from the ground surface.
The golf course according to claim 3, which has a size of -40 cm. 5. The planar heating element is formed by dispersing carbon black in a crystalline thermoplastic resin.
The listed golf course. 6. The embedding depth of the temperature sensing portion is 5 to 1 from the ground surface.
The golf course according to any one of claims 1 to 5, wherein the temperature of the sheet heating element is adjusted by a temperature sensor which is embedded so that the temperature is 0 cm and is directly above the sheet heating element.