JP3341207B2 - Protective material for underground piping - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective material for protecting pipes such as gas pipes, water pipes, and sewer pipes buried underground from impacts caused by a drilling tool, an excavator, and the like.

[0002]

2. Description of the Related Art As a gas pipe or the like, a polyethylene pipe has come to be used from the viewpoint of corrosion resistance, joining properties, economy and the like. By the way, reduction of gas pipe burial work,
In order to reduce the working cost, it is effective to reduce the burial depth. However, if the burying depth of the gas pipe is reduced, the polyethylene gas pipe may be easily damaged by an impact with a drilling tool or the like when excavating the ground in other works.

Therefore, in order to prevent such an accident, conventionally, a plurality of knitted fabrics made of synthetic fiber yarns are laminated, and these knitted fabrics are joined to each other in a thin line along the longitudinal direction thereof. Is known (Japanese Unexamined Patent Publication No.
337090). The work of burying a gas pipe using this protective material is performed as follows. That is,
First, the protection material is attached to the pipe material by arranging the protection material along at least an upper portion of the gas pipe material having a predetermined length over the entire length of the pipe material and binding the protection material at a plurality of locations spaced in the length direction by a binding band. Then, a plurality of such pipe members are connected and then buried in the ground to bury a gas pipe.

[0004]

However, in the case of the conventional protective material, the work of tying with the tying band is troublesome and time-consuming, and as a result, the work of attaching the protective material to the pipe for underground buried piping is easily performed. However, there is a problem that the mounting operation takes a long time.

An object of the present invention is to solve the above-mentioned problems and to provide a protective material for underground pipes which can be easily and quickly mounted on a pipe for underground pipes.

[0006]

Means for Solving the Problems and Effects of the Invention A protective material for underground buried piping according to the present invention comprises: a protective material main body made of a thermoplastic molded article having an arcuate cross section and a predetermined length; A cover made of a chemical fiber woven fabric that is joined to the main body and covers the outer peripheral surface thereof ,
The material of the protective body and cover is buried underground to be protected
It is the same as the piping .

In the above, the protective material main body and the cover are made of, for example, a polyolefin-based synthetic resin, more specifically, polyethylene, polypropylene or the like.
The protective material body and the cover are joined by an adhesive joining method, a solvent joining method, for example, a heat welding method using high frequency.

According to the protective material of the present invention, since the protective material main body is made of a thermoplastic molded article having an arcuate cross section and a predetermined length and having elasticity, the opening extending in the length direction thereof is provided. The protective material can be attached to the pipe material by fitting the protective material body to the pipe material so that the pipe material for underground piping enters the protective material body through the portion. Therefore, as compared with the conventional protective material, the work of attaching to the pipe material for underground buried piping can be performed easily and in a short time, and as a result, the work of burying the pipe can be performed simply and in a short time. In addition, since the cover made of a chemical fiber woven fabric is joined to the protective material main body and the outer peripheral surface of the protective material main body is covered with the cover, damage to the protective material main body due to a drilling tool or an excavator is prevented.

Further , according to the protective material of the present invention, the protective material
The material of the main body and the cover is
Because it is the same, pipes buried underground
When replacing, replace the old material without removing the protective material from the old piping.
Can be processed simultaneously with piping. Piping material is polyethylene
In some cases, this is crushed, melted and regenerated,
The body of the protective material and the material of the cover are also polyethylene
And, it is crushed and melted together with the piping and regenerated.

In the protective material according to the present invention, the protective material body and
And the color of the cover is the same as the underground piping to be protected.
Preferably. Underground such as gas pipe, water pipe, sewer pipe
Buried pipes are separated so that they can be distinguished depending on the application.
Since it is colored in individual colors, the protective material body and cover
If the color is the same as the underground piping to be protected,
Even if protective materials are attached to
You can know the purpose of piping during excavation work.

In the protective material according to the present invention, a printing film on which a symbol (including characters, the same applies hereinafter) is printed on the surface of the cover, and a transparent protective film for protecting the printing is further laminated on the printing film. May have been. On the print film, for example, symbols such as the type of pipe to be protected, the name of the management company, the size of the pipe, and the year of burial are printed. In this case, even when a protective material is attached to the pipe, it is possible to know the purpose of the pipe during excavation work of another construction. If the color of the protective material main body and cover is the same as the underground pipe to be protected, the color of the protective material main body and cover attached to the pipe and the symbol of the printed film will be used for other purposes. You can know the purpose of piping at the time of excavation work. Further, since the printing of the printing film is protected by the transparent protective film, the disappearance of the symbol is prevented.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings.

FIG. 1 shows an underground pipe protection material according to the present invention, and FIG. 2 shows an enlarged view of a main part thereof. FIG.
Fig. 4 shows a method of attaching the protective material to the pipe for piping, and Fig. 4 shows a state in which the protective material is attached to the pipe for piping.

In FIG. 1 and FIG. 2, a protective material (1) for underground buried piping is a protective material main body (2) made of a thermoplastic molded article having an arcuate cross section and a predetermined length.
It is joined to the outer peripheral surface of the protective material body (2) and the protective material body (2)
Cover made of synthetic fiber woven cloth (3)
It is composed of The circumferential length of the cover (3) is slightly shorter than the circumferential length of the protective material body (2).
Both ends in the circumferential direction of the protective material body (2) may be exposed.

The main body of the protective material (2) is preferably partially cylindrical and has a circumferential length of at least two-thirds of the outer circumference of the pipe material (10) for underground piping to be protected. The thickness of the protective material body (2) is preferably set to a thickness such that an impact of a drilling tool or the like is not transmitted to the pipe, for example, about 1 to 2 mm. The length of the protective material main body (2) is preferably slightly longer than the length of the pipe material (10) for underground piping.

The cover (3) is made of a knitted knit or gartered knitted yarn such as a monofilament yarn, a multifilament yarn, a flat yarn or a split yarn made of a thermoplastic synthetic resin such as a polyolefin synthetic resin such as polyethylene or polypropylene. It is formed by knitting with Afghan knitting or weaving with plain weave, satin weave or the like. The thickness of the cover (3) is preferably set to a thickness that can prevent the protection member main body (2) from being damaged by a drilling tool or the like, for example, about 0.4 to 0.6 mm. On the surface of the cover (3), the type of piping to be protected, the size of the piping (11), the name of the management company of the piping (12), the year when buried (13)
The printed film (4) on which symbols indicating the like are printed is laminated, and the transparent protective film (5) for protecting the printing is further laminated on the printed film (4) (FIG. 3).
reference).

For example, when this protective material (1) is used to protect a gas pipe, since the gas pipe is made of polyethylene at present, the protective material main body is used.
(2) and the cover (3) are formed of polyethylene. The colors of the protective material body (2) and the cover (3) are the same as the color of the pipe to be protected, for example, the gas pipe. In addition, protection
The colors of the material body (2) and the cover (3) do not necessarily have to be the same as the piping to be protected, and may be different.
For example, an appropriate designated color may be used.

The protective material (1) is manufactured as follows.

A cover (3) is formed in advance. Then, while extruding a plate material having a predetermined width, the cover (3) is superimposed on the high-temperature and flexible plate material immediately after coming out of the mold, and the two are joined by pressing with a pressure roll. Next, the plate is formed into a partially cylindrical shape so that the cover (3) has an arc-shaped cross section so that the cover (3) is on the outside, and the body (2)
After that, the plate is air-cooled. After that, it is cut into a predetermined length. By continuously performing such operations, the protective material (1) is manufactured continuously.

The operation of protecting a gas pipe using the protective material (1) of the present invention is performed as follows. That is, in advance, the protective material main body (2) whose inner diameter is substantially equal to the outer diameter of the gas pipe tube (10) and whose length is longer than the length of the tube (10).
Prepare a protective material (1) having the following. Then, above the gas pipe tube (10), the opening (2a) extending in the length direction of the protection material body (2) faces downward, and both ends of the protection material (1) in the length direction are pipe materials (2). Protective material (1) to protrude from both ends of (10)
After pressing, the protective material (1) is pressed downward (see FIG. 3). Then, the pipe member (10) passes through the opening (2a) and enters the protection member main body (2), and the protection member (1) is attached to the pipe member (10) (see FIG. 4). At this time, the protective material main body (2) is elastically deformed so that the opening (2a) is once opened (see FIG. 1), and then restored to the original shape.

After attaching the protective material (1) to the plurality of pipes (10) in this way, the ends of the pipes (10) are joined in a butt shape by, for example, a heat welding method. This joint is for tubing (10)
Either shift the protective material (1) attached to the pipe in the length direction, or remove both ends of the protective material (1) from the pipe (10) once.
Then, the protective material (1) is returned to the original state where both ends protrude from both ends of the pipe (10), and the protruding portions of the protective material (1) attached to the adjacent pipe (10) are overlapped. .
In this way, the protection work of the gas pipe is performed, and then the gas pipe is buried.

Since there are a plurality of types of outer diameters, lengths, and the like of pipes (10) used for underground piping such as gas pipes, a plurality of types of protective materials (1) are prepared in accordance with these. .

In the above embodiment, the case where one protection member (1) is attached to one underground pipe pipe (10) is shown, but the length of the pipe (10) is relatively long. In case 1
Protective material (1) on each tube (10)
It is preferable to mount (1) so that the end protrudes from both ends of the pipe (10). In this case, the protection material (1) can be made relatively short, and storage, transportation, handling, etc. of the protection material (1) become easy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a protective material for underground piping according to the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a perspective view showing a gas pipe protecting operation method using a protective material according to the present invention.

FIG. 4 is a cross-sectional view showing a state in which a protection member according to the present invention is attached to a gas pipe tube.

[Explanation of symbols]

 (1): Protective material for underground piping (2): Protective material body (3): Cover (4): Printed film (5): Transparent protective film (10): Pipe material for piping

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 57/00 F16L 1/024

Claims (3)

(57) [Claims] 1. A protective material body made of a thermoplastic molded article having an arcuate cross section and a predetermined length, and a cover made of a chemical fiber woven fabric joined to the protective material body and covering the outer peripheral surface thereof. The protective material itself and
And the material of the cover is the same as the underground piping to be protected.
Underground piping protective material being. 2. The underground pipe protection material according to claim 1, wherein the colors of the protection material main body and the cover are the same as those of the underground pipe to be protected. 3. The underground pipe protection according to claim 1, wherein a printing film on which a symbol is printed is laminated on the surface of the cover, and a transparent protective film for protecting printing is laminated on the printing film. Wood.