JP2000283347A - Polyethylene pipe - Google Patents

Abstract

(57) [Problem] To provide a polyethylene pipe capable of preventing permeation of an organic solvent (such as trichloroethylene) and oils (gasoline and kerosene) into the pipe. SOLUTION: An outer peripheral surface of a polyethylene tube main body 2 is covered with a nylon covering material 3, and the covering material 3 is adhered to an outer peripheral surface of the tube main body 2 with an adhesive 4, and an adhesive polyolefin is used as the adhesive 4. Used. According to this, the coating material 3 made of nylon shields the permeation of the organic solvent and the oils, so that the organic solvent and the oils can be prevented from permeating through the pipe main body 2 and entering the pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyethylene pipe which is buried in soil and used for water supply and sewerage, and transports drinking water, industrial water, agricultural water and the like.

[0002]

2. Description of the Related Art Conventionally, as this kind of polyethylene pipe, as shown in FIGS. 5 and 6, a pipe main body 30 is formed of high-density polyethylene.

[0003]

However, in the above-mentioned conventional type, the pipe main body 30 has a single structure of high-density polyethylene. In general, polyethylene uses an organic solvent (such as trichloroethylene) or an oil (such as gasoline or kerosene). When the polyethylene pipe 31 is buried in the soil, organic solvents and oils contained in the soil cause the pipe body 30 to penetrate.
There is a problem that the liquid permeates through the polyethylene pipe 31 and enters the inside of the polyethylene pipe 31, and such intrusion of the organic solvent or oil may adversely affect the fluid flowing through the polyethylene pipe 31.

[0004] It is an object of the present invention to provide a polyethylene pipe capable of preventing an organic solvent or oil from permeating into the pipe.

[0005]

In order to solve the above-mentioned problems, the polyethylene pipe according to the first aspect of the present invention is obtained by covering the outer peripheral surface of a polyethylene pipe main body with a coating material made of synthetic resin. According to this, since the coating material made of synthetic resin shields the permeation of the organic solvent and oil, it is possible to prevent the organic solvent and oil from penetrating through the pipe main body and entering the pipe.

The polyethylene pipe according to the second aspect of the present invention is obtained by bonding a coating material to an outer peripheral surface of a pipe main body with an adhesive.
According to this, it is possible to prevent the coating material from peeling off from the outer peripheral surface of the pipe main body. The polyethylene pipe according to the third aspect of the present invention uses a nylon coating material as the synthetic resin coating material.

[0007] According to this, since the nylon coating material blocks the permeation of the organic solvent and oils, it is possible to prevent the organic solvent and oils from penetrating through the pipe main body and entering the pipe. The polyethylene pipe according to the fourth invention uses an adhesive polyolefin as an adhesive.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, reference numeral 1 denotes a polyethylene pipe buried in soil or the like, and a pipe main body 2 of the polyethylene pipe 1 is formed of high-density polyethylene (PE100). The pipe body 2
Is coated with a thin coating material 3 made of nylon (an example of a synthetic resin). The coating material 3 is adhered to the outer peripheral surface of the tube main body 2 with an adhesive 4, and the adhesive 4 is made of an adhesive polyolefin.

The operation of the above configuration will be described. When the polyethylene pipe 1 is buried in soil contaminated with an organic solvent or oil near a factory site, a gas station, a laundry shop, or the like, the nylon covering material 3 blocks the permeation of the organic solvent or oil. Therefore, it is possible to prevent organic solvents and oils in the soil from penetrating through the pipe body 2 and entering the pipe. As a result, there is no possibility that the organic solvent or oil is mixed into the fluid flowing in the polyethylene pipe 1 and adversely affects the fluid.

Further, since the coating material 3 is firmly and integrally adhered to the outer peripheral surface of the pipe main body 2 with the adhesive 4, the coating material 3 can be prevented from peeling off from the outer peripheral surface of the pipe main body 2. . The strength, corrosion resistance and the like of the polyethylene pipe 1 covered with the coating material 3 as described above are the same as those of the conventional polyethylene pipe and are not inferior. In the above embodiment,
Although the coating material 3 made of synthetic resin is made of nylon, it is not limited to nylon, and the coating material 3 made of ethylene vinyl alcohol copolymer (EVOH) may be used.

FIGS. 3 and 4 show a state in which the end of the polyethylene pipe 1 is joined to the end of another polyethylene pipe 1 via a joint 5. FIG. That is, as shown in FIG. 3, the coating material 3 and the adhesive 4 at the end of the polyethylene pipe 1 on the one side A and the coating material 3 and the adhesive 4 at the end of the polyethylene pipe 1 on the other side B are peeled off to remove each of the pipes. The end of the main body 2 is exposed, and as shown in FIG. 4, the end of the polyethylene pipe 1 on the one side and the end of the polyethylene pipe 1 on the other side are inserted into the joint 5, and thereafter, by electric fusion bonding. The polyethylene pipes 1 are joined together.

The joint 5 is a cylindrical member made of high-density polyethylene, and an oil-resistant nitrile rubber-based sealing material 6 is provided over the entire circumference between the polyethylene pipe 1 and the joint 5. After the electrofusion bonding, both the polyethylene pipes 1 and the joints 5 are covered with a thin covering member 9 made of nylon or aluminum for shielding the permeation of an organic solvent or oils.
The outer peripheral surface of the joint 7 is covered, and the cylindrical heat-shrinkable tube 8 is thermally contracted from the outside thereof, so that the covering material 9 for the joint is brought into close contact with the outer peripheral surface of the joint 7.

The heat-shrinkable tube 8 is made of cross-linked polyethylene, and a thin layer of nylon or aluminum corresponding to the joining material 9 is integrally provided on the inner peripheral surface of the heat-shrinkable tube 8. You may.

[0014]

As described above, according to the present invention, the coating material made of synthetic resin such as nylon shields the permeation of organic solvents and oils. Can be prevented from invading. Thus, the fluid flowing through the pipe is not adversely affected by the organic solvent or oil mixed therein, and the polyethylene pipe can be piped even in a place containing the organic solvent or oil.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a polyethylene pipe according to an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1.

FIG. 3 is a cross-sectional view of an end of the polyethylene pipe and a joint when the polyethylene pipes are joined together.

FIG. 4 is a cross-sectional view showing a state where the polyethylene pipes are joined together via a joint.

FIG. 5 is a cross-sectional view of a conventional polyethylene pipe.

6 is a view as viewed in the direction of arrows AA in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polyethylene pipe 2 Pipe main body 3 Coating material 4 Adhesive

Claims (4)

[Claims] 1. A polyethylene pipe, wherein an outer peripheral surface of a polyethylene pipe body is covered with a synthetic resin coating material. 2. The polyethylene pipe according to claim 1, wherein the coating material is adhered to an outer peripheral surface of the pipe main body with an adhesive. 3. The polyethylene pipe according to claim 1, wherein a nylon coating material is used as the synthetic resin coating material. 4. The polyethylene pipe according to claim 2, wherein an adhesive polyolefin is used as the adhesive.