JP2002221287A - Synthetic resin pipe for underground installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin pipe for underground installation, the installed location of which can easily be detected by using a magnetometer. SOLUTION: On the outer peripheral face of a synthetic resin pipe 11, a sign line 13 containing a magnetic substance is integrally formed, or a sign tape containing the magnetic substance is stuck, or a sign is drawn by using an ink containing the above substance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buried synthetic resin pipe and, more particularly, to easily find the buried position of a synthetic resin pipe used for a water pipe or a gas pipe buried underground or the like. The present invention relates to a buried synthetic resin pipe.

[0002]

2. Description of the Related Art Conventionally, various techniques have been used to determine the burial position of a synthetic resin pipe buried underground. For example, by connecting a capacitor to both ends of an antenna coil wound around a ferrite and burying a detection marker forming a resonance circuit together with an embedded object, and transmitting a specific frequency to resonate the resonance circuit from a terrestrial detection device. There is known a method for detecting the presence of a buried pipe by detecting a marker.

[0003]

However, in the conventional method, it is necessary to install a detection marker each time a buried pipeline is laid, which is not only troublesome, but also raises the cost of the detection marker. .

Therefore, the present invention provides a buried synthetic resin pipe which can be buried in the same manner as a normal synthetic resin pipe, and which can easily detect the buried position by using a magnetic detector. It is intended to be.

[0005]

In order to achieve the above-mentioned object, a buried synthetic resin pipe of the present invention has a marker made of a synthetic resin containing a magnetic substance which can be detected by a magnetic detector on an outer peripheral surface of the synthetic resin pipe. The wire is formed integrally with the synthetic resin pipe, or
Affixing a label tape containing the magnetic material, or
It is characterized in that a sign is drawn with ink containing the magnetic material.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing a first embodiment of a buried synthetic resin pipe according to the present invention. The buried synthetic resin tube 11 contains a magnetic material by extruding a synthetic resin forming the main body 12 of the synthetic resin tube 11 and a synthetic resin containing a magnetic material by a simultaneous twin-screw extrusion method. The marker wire 13 is formed integrally with the outer periphery of the main body 12.

As the synthetic resin for the main body 12, various synthetic resins generally used for piping, for example, polyvinyl chloride, polyethylene, polybutene and the like can be used. Further, a synthetic resin for forming the marker line 13 is also optional, but usually, the same synthetic resin as the main body 12 may be used. The magnetic substance may be any substance as long as it can be detected by a magnetic detector. For example, iron, nickel, carbon, and the like can be used, and these powders may be mixed with the synthetic resin and used.

The thickness and width of the marker line 13 are within a range that can be detected from the ground by a magnetic detector and the main body 1
2 can be arbitrarily selected as long as the required strength is not impaired. However, the thickness of the marker wire 13 does not exceed 10% of the tube thickness, and is usually about 0.1 to 0.2 mm. Just fine. Further, by setting the width dimension of the marker line 13 as narrow as possible within a range that can be detected by the magnetic detector, the cost required for the magnetic material can be reduced. However, most or all of the tube is made of a synthetic resin containing the magnetic material. It is also possible to cover. Further, a plurality of marker lines 13 may be provided.

FIG. 2 shows a second embodiment of the buried synthetic resin pipe of the present invention.
It is a perspective view which shows a form example. This buried synthetic resin pipe 21
Is on the outer peripheral surface of the synthetic resin pipe extruded by the usual method,
The label tape 22 made of a magnetic tape containing a magnetic material is adhered. The thickness and width dimensions of the marking tape 22 are as follows:
In the same manner as described above, a selection can be made arbitrarily within a range that can be detected by the magnetic detector and within a range that does not impair the handleability of the synthetic resin tube 21, and a plurality of marker tapes 22 can be attached.

Further, the magnetic tape forming the marker tape 22 is optional, and a commercially available magnetic tape can be used, but the material is preferably the same resin as the pipe main body. The means for attaching the marking tape 22 to the outer peripheral surface of the tube can also be appropriately selected. For example, a general adhesive may be used, or the marker tape 22 may be attached using heat fusion. . In the case where the marking tape 22 is continuously adhered to the outer peripheral surface of the synthetic resin pipe in the axial direction, by installing a tape adhering device in an extrusion molding facility for the synthetic resin pipe, the extrusion molding of the synthetic resin pipe can be performed. Marking tape 2
2 can be performed simultaneously. Further, various information can be printed on the surface of the sign tape 22.

FIG. 3 shows a third embodiment of the buried synthetic resin pipe of the present invention.
It is a front view which shows a form example. This buried synthetic resin pipe 31
Is on the outer peripheral surface of the synthetic resin pipe extruded by the usual method,
The mark 32 is drawn using the same ink containing a magnetic substance as described above. The mark 32 is formed of the synthetic resin tube 31.
Related information, for example, manufacturing company or its mark 3
2a, use 32b, size 32c, material 32d, lot number, other various marks and symbols, barcode 32
e, etc., and the same notation as a normal synthetic resin tube can be described. Further, as the ink, it is possible to use a mixture of various inks conventionally used for printing on the surface of a synthetic resin or the like and a magnetic powder.

Further, in addition to the above-described mark 32 using characters or symbols, a mark line in the tube axis direction can be drawn with ink containing the above-mentioned magnetic substance. Various information can be printed, and this adhesive tape or the like can be attached to the outer peripheral surface of the tube.

In each of the above embodiments, a straight pipe type synthetic resin pipe has been described as an example. However, the same applies to a synthetic resin pipe such as a joint or an elbow. By performing simultaneous biaxial molding at the time of injection molding, the marker wire 13 including the magnetic material can be integrally molded. The one shown in the second and third embodiments can be formed at an appropriate time after molding.
The marker tape 22 containing a magnetic material may be attached to a position detectable by a magnetic detector, or the marker 32 may be drawn using ink containing a magnetic material.

As described above, the marker line 13 containing the magnetic material is integrally formed on the outer peripheral surface of the synthetic resin tube, the marker tape 22 containing the magnetic material is adhered, and the marker 32 is formed with the ink containing the magnetic material. By drawing or appropriately combining them, the position of the buried synthetic resin pipe can be easily and reliably detected from the ground by using a magnetic detector. This makes it possible to reliably perform excavation work or the like when repairing or replacing the buried pipe.
Furthermore, even when new or expanded facilities that use water or gas are used, the location of the nearest buried pipeline can be known with certainty, so it is easy to take measures such as installing branch pipes or replacing pipes. Can be. In order to easily detect the embedding position, it is preferable to lay the synthetic resin pipe so that the marker line 13, the marker tape 22, and the marker 32 face the upper surface at the time of embedding.

[0015]

As described above, according to the buried synthetic resin pipe of the present invention, the position of the buried synthetic resin pipe can be easily detected from the ground by using a magnetic detector.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a buried synthetic resin pipe of the present invention.

FIG. 2 is a perspective view showing a second embodiment of the embedded synthetic resin pipe of the present invention.

FIG. 3 is a front view showing a third embodiment of the embedded synthetic resin pipe of the present invention.

[Explanation of symbols]

11: embedded synthetic resin tube, 12: body part, 13: marker wire, 21: embedded synthetic resin tube, 22: marker tape, 31
... Synthetic resin tube for burial, 32 ... Sign

Claims (3)

[Claims] 1. A buried synthetic resin tube, wherein a marker wire made of a synthetic resin containing a magnetic material is formed integrally with the synthetic resin tube on an outer peripheral surface of the synthetic resin tube. 2. A synthetic resin tube for embedding, wherein a label tape containing a magnetic material is attached to an outer peripheral surface of the synthetic resin tube. 3. A buried synthetic resin tube, wherein a mark is drawn on an outer peripheral surface of the synthetic resin tube with ink containing a magnetic material.