JPH0532703Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] This invention relates to a buried pipe marking tape with a locator function that indicates the buried position of buried pipes such as gas pipes and water pipes. Incidentally, the term "buried pipe line" refers to the entire length of one buried pipe, and the term "buried pipe line marking tape" refers to a marking tape that is applied continuously over the entire length of the buried pipe. [Prior Art] Conventionally, for example, when burying gas pipes, water pipes, etc. under the road surface, specified printed markings were printed on the top surface of the base material in a color tone determined by the Ordinance of the Ministry of Construction according to the type of pipe to be buried. The construction specifications stipulated that adhesive tape-like signs that had been carried out should be pasted on the ground surface of gas pipes, water pipes, etc. at predetermined intervals, and then backfilled with earth and sand. In recent years, in order to improve the anti-corrosion effect of gas pipes, water pipes, etc., steel pipes lined with plastic such as vinyl or polyethylene on the inside and outside, and polyethylene pipes, etc., have been used. , a construction method has been implemented in which locator wires are laid along buried pipes such as water pipes. Therefore, in recent years, with the increase in the number of lining pipes, it has become more common to perform the work of attaching buried pipe marking tape and the work of laying locator wires at the same time. [Problems to be solved by the invention] With the conventional buried pipe marking tape as mentioned above,
Since it does not have a locator function, the work of laying the locator wire must be redundantly performed in addition to the work of attaching the buried pipe marking tape, resulting in a problem of poor work efficiency. This idea was devised to solve this problem, and by adding a locator function to the buried pipe marking tape that can detect its position using an energizing method, the work of laying locator wires can be omitted and work efficiency can be improved. The purpose is to obtain a buried pipe marking tape with a locator function that can be used to locate buried pipes. [Means for Solving the Problems] The buried pipeline marking tape with a locator function according to this invention includes a colored or printed plastic film and a continuous line in the longitudinal direction of the plastic film and a single wire, thin wire, metal foil, or plate. It is a tape-shaped material that is made of a conductive layer with a cross-sectional area that can secure the necessary current, such as a conductive material, and an adhesive layer that maintains adhesive strength so that it does not easily come off from the tube surface. It is designed so that it can be done. [Function] In this invention, when attached to a buried pipe using an adhesive layer, the colored or printed plastic film acts as a marker, and the conductive layer functions as a locator wire that indicates the location of the buried pipe by detecting the current application method. hold. [Embodiment of the invention] An embodiment of the invention will be described with reference to FIG. In the figure, 1 is a plastic film;
It has a printed layer 2 on the surface of which a desired printed display is carried out. 3 is an adhesive layer provided on the back surface of the plastic film 1, and 4 is a conductive layer sandwiched between the plastic film 1 and the adhesive layer 3, which is made of a plate-shaped conductor continuous in the longitudinal direction of the plastic film 1. That is, the buried pipe marking tape of the present invention illustrated in FIG. 1 uses the plastic film 1 to indicate the type, grade, and contents of gas pipes and water pipes. The corresponding identification coloring and printing layer 2 do not discolor to an unrecognizable extent when buried underground, and the film alone has a tensile load of at least 5.5 Kgf/10 mm width, 150
% or more. The conductive layer 4 may be a plate-shaped conductor, or may be a round, rectangular, twisted, or other shaped solid wire, thin wire, or metal foil, but the effective cross-sectional area of the conductive layer 4 is preferably small for handling purposes. However, it is specified in the range of 0.30mm ² to 3.0mm ² due to the amount of current required for detection. In other words, the reason for specifying this range is, in part, to ensure complete current measurement using this tape; an effective cross-sectional area of 0.30 mm ² or less cannot secure the amount of current necessary for measurement; This is because as a result of the measurement sensitivity being reduced, noise from connected lead wires and the like is picked up, making the current measurement incomplete. Another reason is that when the cross-sectional area is 3.0 mm ² or more,
The conductor becomes larger or thicker than necessary, making it difficult to form a flexible tape, making it difficult to make close contact with pipes, connect to measuring instrument lead wires, or connect marker tapes to be placed over the entire pipe line. This is because not only is it difficult, but the effect of thickening or enlarging the cross-sectional area cannot be obtained at all. The adhesive layer 3 has a beading adhesive strength of 200 g to 1000 g/10 mm, and if necessary, the composition should be carefully selected so that the adhesive strength does not deteriorate significantly due to absorption of moisture in the ground. In addition, since the adhesive layer 3 is made of a plastic composition such as rubber or acrylic,
It also has anti-corrosion and protective effects for the conductive layer 4. As described above, the buried pipe line marking tape is made of plastic film 1, printing layer 2, adhesive layer 3, conductive layer 4.
If the composite material is made up of
When the plastic film 1 is buried underground, the plastic film 1 having the printed layer 2 functions as a marker, and the conductive layer 4 retains the function of a locator wire that can be detected by an energization method. Note that the plastic film 1 and the conductive layer 4
In order to assist in adhesion between the adhesive layer 3 and the adhesive layer 3, an adhesion auxiliary layer may be provided between the two. The embodiment shown in FIG. 2 has three thin wires 4a as the conductive layer 4, and the embodiment shown in FIG. 3 does not embed the conductive layer 4 in the plastic film 1 as in the embodiment shown in FIG. The embodiment shown in FIG. 4 is the embodiment shown in FIG. 3 in which the printing layer 2 is provided on the back side of the plastic film 1.
In the embodiment shown in FIG. 5, a conductive layer 4 is sandwiched between two plastic films 1a and 1b. Example 1 (1) On the surface of a 0.16 mm green soft vinyl film,
The first step is to print the desired display on the substrate using printing ink using a vinyl vehicle.
As shown in the figure, a composite film is created by laminating rolled copper foil with a thickness of 60μ in three widths of 5mm, 10mm, and 20mm against an effective width of 30mm. (2) Apply 10 to 20 microns of soft vinyl resin as a protective layer to the copper foil surface of the composite film to prevent the adhesive from deteriorating. (3) Further, on the vinyl protective layer, 0.5 to 1 μm of a nitrile phenol undercoat was applied, and 30 to 50 μm of a synthetic rubber adhesive was further applied, and the following tests were conducted. (4) Three types of copper foil tapes with different widths are wrapped around a 65φ PE pipe at a pitch of approximately 120mm, and
Bury at a depth of 1.5m. (5) DGO- manufactured by Toyo Machine Industry Co., Ltd.
The results of measurement using LOCATOR 762 type are shown. <Measurement method> The measurement method will be explained using the following diagram. (a) Place on earth where the magnetic field is strongest (surface above the tube)
is found by the magnitude of the deflection of the detector meter using a detection rod. (b) Next, adjust the sensitivity dial of the detector meter so that the deflection of the meter needle is within the Set
Adjust it so that it is in position. (c) Next, move the measurement position until the needle of the detector meter is at position D in the meter. (d) Measure the distance L between the initial Set position and D position. (e) Double the distance L to find the depth of the pipe. <Measurement results 1> Sensitivity value of the sensitivity dial when the needle of the detector meter is at the Set position

[Table] As shown in the table, all of the buried pipe line marking tapes of the present invention had a measurement sensitivity of 3.5, which was approximately equivalent to the IV line 7/0.6 line of the comparative example. <Measurement results 2> Detection of pipe depth

【table】

[Table] All buried pipe marking tapes of the present invention having copper foil with a cross-sectional area of 0.30 mm ² to 3.0 mm ² showed good pipe depth detection ability. Example 2 Pipe adhesion performance and connection function were tested for composite films made by laminating rolled conductive foils with thicknesses of 60μ, 120μ, 150μ, and 180μ with widths of 20mm and green soft vinyl film with an effective width of 30mm and a thickness of 0.16mm. As a result, we obtained the following results.

【table】

[Table] As shown in the table, good tube adhesion and connection performance were obtained with the composite film having a copper foil with a cross-sectional area of 1.2 to 3.0 mm ² . As described above, it has been found that, in practice, if measurements can be made within the sensitivity range of 3 to 4, it is possible to detect buried pipes from the ground surface using an energizing method without picking up noise from lead wires or the like. On the other hand, in order to maintain the sensitivity within the range of 3 to 4,
It was also found that the effective cross-sectional area of the conductor needs to be 0.30 mm ² or more, and from the viewpoint of tube density performance and connection performance, it needs to be 3.0 mm ² or less. [Effects of the invention] As explained above, this invention has the effect of providing the buried pipe line marking tape with a locator function that can be detected using an energizing method, thereby omitting the work of laying locator wires and improving work efficiency.

[Brief explanation of the drawing]

1 to 5 are sectional views showing different embodiments of this invention. In the figure, 1 is a plastic film, 2 is a printing layer, 3 is an adhesive layer, and 4 is a conductive layer. In addition,
The same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A colored or printed plastic film and a conductor such as a solid wire, thin wire, metal foil, plate, etc. that continues in the longitudinal direction of the plastic film and is capable of securing the necessary current. 0.30~ ^3.0mm2
Buried with a locator function, consisting of a conductive layer with an effective cross-sectional area of Tube line marking tape. (2) A buried pipeline marking tape with a locator function as claimed in claim 1 of the utility model registration, in which a plate-shaped conductor is sandwiched in three layers between a plastic film and an adhesive layer. (3) A buried pipeline marking tape with a locator function as set forth in claim 1 of the utility model registration claim, which has a printed layer formed on the surface of a plastic film.