JPH0649053Y2 - Electric cable laying pipeline that can be monitored inside the pipeline - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an electric cable laying system in which electric cables such as electric power cables and communication cables are drawn in. Regarding the pipeline.

[Prior Art] Conventionally, it is investigated whether the pipeline is damaged, the pipeline connection is stepped, or the cable seal is damaged even after the electric cable is drawn into the pipeline laid underground. In order to
May be inspected.

As an inspection means, an optical fiberscope or TV camera is used, and since the fiberscope or TV camera cord is manually pushed from the end of the pipeline through the gap where the electric cable is pulled in, it can be inserted at most about several tens of meters, When it comes to 300m long pipeline, it is almost impossible to check the full length.

For this reason, similar to the case where the electric cable is first drawn into the pipeline, the conduit rope is drawn along with the electric cable, and by connecting and pulling the fiberscope or TV camera cord to this, The method of inspecting the inside of the pipeline is adopted.

In this case, it is not possible to lay the electric cable and the wire rope together, because the diameters of the cables are considerably different from each other, and therefore the rotation of the cable causes the cable to be entangled with the cable and the rope to be laid parallel to the cable. difficult. For this purpose, a flexible pipe with a diameter close to the cable diameter, which has been previously inserted with a wire rope, is pulled in together with the cable, and then by pulling out only the pipe, the wire rope is not entangled in the cable. It is laid in parallel with.

[Problems to be solved by the invention] However, even if the wire rope is laid parallel to the electric cable as described above, if the fiberscope or the TV camera is connected to and pulled by the rope, the rope and the inner wall of the conduit are pulled. There is a possibility that it will be caught in the gap between and, and especially if there is a bend in the pipeline, the rope may bite into the above-mentioned gap positively, and in this case it will be easier to pull in and out the line rope.

[Means for Solving the Problems] The above problem is that the fiberscope or the television camera is moved through the non-smooth gap between the inner wall of the conduit and the electric cable, and the diameter is significantly different from that of the electric cable. This is a problem that inevitably arises from leaving the wire rope attached to the electric cable as it is, and this invention was made in order to solve such a problem.
A transparent flexible pipe is drawn into the pipe together with an electric cable, and another invention is to insert a wire rope in advance inside the flexible pipe.

[Operation] In the present invention, since the transparent flexible pipe is drawn into the pipe together with the electric cable, the inside of the pipe can be seen through, and the inside of the pipe can be seen through. Since the wire rope is inserted, the fiberscope and the television camera can be smoothly drawn into the pipe without any obstacle.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. First, in FIG. 1, 1 is a pipe line buried in the ground, 2 is a single electric cable drawn into the pipe line, 3 is a transparent flexible pipe also drawn into the pipe line 1. Reference numeral 4 is a fiberscope or a television camera inserted in the pipe 3. Of course, the flexible pipe 3 has a sufficient inner diameter into which a fiberscope or a television camera can be inserted. It is desirable to have an outer diameter that is not significantly smaller than the outer diameter of the cable. Further, since the inside of the pipe 3 is seen through the inside of the pipe, it is necessary to select a material having high transparency, and a vinyl resin, an acrylic resin, an ethylene resin, a styrene resin, or the like is selected. To insert a fiberscope or TV camera in a flexible pipe,
Even if they are pushed in from the end of the pipeline, a rope may be inserted and then a fiberscope or a television camera may be connected to this and the rope may be pulled.

Next, one embodiment of another invention will be described with reference to FIG. 5 is a three-section electric cable buried in the ground,
Reference numeral 6 is a wire rope that is inserted into the transparent flexible pipe 3 that is pulled in together with the electric cable 5. Here again, it is desirable that the outer diameter of the pipe 3 is not much smaller than the diameter of the circumscribing circle of the three electric cables 5.

[Effect of the Invention] According to the present invention, the conduit 1 along with the electric cables 2 and 5 is provided.
The flexible pipe 3 drawn in is made of a transparent material, and its inner surface can be finished to be smooth. Therefore, if a fiberscope or a television camera 4 is inserted into the flexible pipe 3, it will pass through the wire. It can be inserted to a considerably long distance without being pulled by a rope, and the situation inside the pipeline 1 can be seen through the transparent wall of the pipe 3, such as breakage of the pipeline, step difference of the pipeline connection portion, cable sheath. It is possible to inspect and monitor whether there is damage to the product, intrusion of foreign matter, etc.

According to another invention, since the wire rope 6 is inserted in the flexible pipe 3, the smoothness in the pipe 3 does not cause a great tension on the fiberscope or the television camera cord. It can be inserted into a long-distance pipe.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the electric cable laying conduit of the present invention, and FIG. 2 is a cross-sectional view showing another embodiment of the electric cable laying conduit of the present invention. 1: Pipe line, 2, 5: Electric cable, 3: Transparent flexible pipe,
4: Fiberscope or TV camera, 6: Wire rope.

Claims (2)

[Scope of utility model registration request] 1. An electric cable laying line capable of monitoring inside a pipe, in which an electric cable and a transparent flexible pipe are drawn and laid inside the pipe. 2. The electric cable laying pipeline capable of monitoring inside the pipeline according to claim 1, wherein the transparent flexible pipe has a cable rope inserted thereinto in advance.