JPH0744769B2 - Electric wire / cable penetration method and device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for penetrating an electric wire or cable into a conduit and an apparatus therefor. More specifically, in order to penetrate an electric wire or cable into a long, long-distance conduit, a method of transporting a lead wire or an electric wire / cable itself for penetrating the electric wire or cable by a Coanda spiral flow and its method Regarding the device.

(Technical background) Conventionally, in order to pass an electric wire or cable through a conduit made of metal, plastic, or the like having a length of 100 m to 200 m or more, forcibly a string-shaped object or a small diameter Although a plastic pipe was pushed in and a lead wire was tied to the plastic pipe to pass the lead through the conduit, this method was extremely difficult in the case of a curved conduit.

Also, instead of this compulsory method, a method of transporting and penetrating a lead wire for penetrating an electric wire or a cable by air or the like has been proposed. Is in a turbulent state, it is unavoidable that the lead wire and the inner wall of the pipe are abraded and damaged by violent collision. Moreover, a more serious problem was that the lead wire was agglomerated instead of becoming a linear flow due to turbulent disturbance. Further, since the work uses compressed air, there is a problem in safety of work.

Of course, various attempts have been made to penetrate electric wires and cables by lead wires, such as magnetic attraction, but
For long-distance or long-distance pipe penetration of 200 m or more, an efficient method and a device therefor, which does not damage electric wires, cables or pipelines, have not been realized.

(Object of the Invention) The present invention has been made in view of the above circumstances, and a method for efficiently and without damaging a wire or cable in a long and long-distance pipeline and a method therefor The purpose is to provide a device.

(Structure of the Invention) In order to achieve the above object, the present invention provides a pressurized fluid,
For example, by the Coanda spiral flow generated by high-speed inflow of compressed air, the lead wire or the electric wire / cable itself for penetrating the electric wire, the cable, or the like is conveyed into the pipeline, and the electric wire or the cable is penetrated into the pipeline. It is characterized by that.

The industrial use of this Coanda spiral flow was first discovered by the inventor of the present invention. That is, when a vector in the pipe radial direction is added to the vector of the fluid in the pipe direction, the fluid swirls, and a high-speed and low-pressure portion is formed on the pipe axis based on this swirling flow, and the fluid spirals.
While drawing, I found the fact that it proceeded at high speed in the pipeline direction. When solid particles or linear substances are introduced into this spiral flow, they move in the direction of the pipeline while drawing a spiral, and the contact with the inner wall of the pipeline is prevented by the dynamic boundary layer formed near the inner wall of the pipeline. It is suppressed.

The present invention utilizes such a Coanda effect.

In order to generate the Coanda spiral flow, in the present invention, the fluid flowing into the conduit and, for example, the pressurized fluid is fed in from the lateral direction with respect to the flow direction of the lead wire. More specifically, for example, a pressurized fluid is fed into the tube from a slit formed in an annular shape in a cylindrical tube, and the pressurized fluid is passed along the wall surface smoothly curved in the moving direction of the fluid in the tube from the slit. To flow. By using the spiral flow generated in this way, high-speed movement of the lead wire and spiral motion are realized.

The penetration method and apparatus of the present invention will be described more specifically with reference to the accompanying drawings.

FIG. 1 illustrates an essential essential part (Coanda spiral flow generation part) for the penetration method of the present invention.

In the example shown in FIG. 1, for example, an inner diameter of about 80
The main cylinder (2) is connected to the end surface of the pipe (1) having a length of about 200 mm and a length of about 200 m so as to have the same diameter as the pipe. This main cylinder (2)
The diameter gradually increases in a direction similar to that of the connection surface.

The main cylinder (2) is formed with an annular slit (3) for laterally feeding the pressurized fluid. Also, this slit (3)
A wall surface (5) that is smoothly curved from the to the pipe line is provided. An auxiliary cylinder (4) is provided on the end surface of the main cylinder (2) opposite to the conduit (1) to form an inlet (6) for a lead wire or the like.
Furthermore, a means (7) for supplying a pressurized fluid to the slit is provided.

On the side of the slit (3) opposite the wall surface (5), the auxiliary tube (4)
Bend the wall surface (8) into a right angle or an acute angle.

The slit (3) preferably has a structure in which the gap can be adjusted.

Although an appropriate structure can be adopted as the means (7) for supplying the pressurized fluid to the slit (3), the distribution chamber (21) is provided so as to surround the main cylinder (2), and the distribution chamber and the distribution chamber (21) are provided. It is possible to communicate with the gap (3).

When air is used as the pressurized fluid, the inclination angle θ of the main cylinder (2) is preferably such that tan θ is about 1/4 to 1/8. The ratio of the inner diameters of the pipe (1) and the main cylinder (2) is preferably about 1/2 to 1/5. By doing so, the flow velocity of air in the pipeline is increased to 4 to 25 times the flow velocity in the main cylinder.

That is, for example, pressurized air of ^{2 to} 10 kg / cm ² G is fed at high speed from the slit (3) into the main cylinder (2), and at the outlet of the slit (3), air is aerodynamically operated (coanda). The effect) draws a streamline (α) inclined from the main cylinder (2) to the conduit (1) side,
As a result, a negative pressure region is generated on the opposite side. A fluid such as air and a lead wire flow into the negative pressure region (arrow β).

The motion vector of the air flow from the slit (3) and the motion vector of the fluid indicated by the arrow β, for example, the flow of the air, are combined to form an air flow advancing toward the conduit (1). The airflow is gradually reduced in diameter, with a radial vector. This vector in the radial direction is converted into a turning vector, and together with the straight-ahead vector, spiral motion is generated.

Of course, the fluid is not limited to air. nitrogen,
It may be an inert gas such as argon or helium, or a liquid.

The inclination angle θ of the main cylinder (2) and the ratio of the inner diameters of the conduit (1) and the cylindrical pipe (2) can be appropriately selected as in the case of the air.

In addition, the Coanda spiral flow generating unit for conveying and penetrating lead wires and the like for penetrating electric wires and cables according to the present invention is not limited to the above examples. Various structural variations are possible. Not only is the main cylinder (2) formed into a cone shape immediately from the side of the annular slit (3) as shown in FIG. 1, but also the annular slit as shown in FIGS. 2 and 3. It may be formed in a cone shape from the side through the cylindrical portion (10). Further, the introduction port (6) may have a cone shape as shown in FIG. 2, or the lead wire or the like may be guided by the introduction pipe (11) as shown in FIG.

The lead wire itself may be introduced from the introduction port (6) and transferred using the Coanda spiral generator as described above, or alternatively, the lead wire may be attached to the tip of the lead wire to facilitate transfer by spiral motion. , Spheres, preferably lightweight hollow spheres, may be attached for transport.

As the material of the lead wire, it is desired that the lead wire has sufficient rigidity to withstand the tension when pulling the electric wire and cable, and has a strength against twisting and a light weight suitable for spiral motion.

After penetrating the lead wire, connect the electric wire or cable to the rear end of the lead wire, and pull the lead wire at the outlet side of the conduit (1) to penetrate the electric wire or cable into the conduit (1). be able to.

Further, when the electric wire or cable is lightweight, the wire itself may be transported instead of the lead wire.

After completing the penetration work, remove the spiral flow generator from the end face of the pipe (1).

The size of the conduit connecting surface of the generator can be adjusted so that it can be used for conduits having different inner diameters and shapes.

In the case of the above method and device, the inner wall of the conduit, the lead wire, etc. are not damaged, and the lead wire can be conveyed and penetrated at a high speed of, for example, 100 to 200 m / min.

(Effects of the Invention) As described above, the present invention enables efficient, safe, and undamaged transfer of lead wires and the like, thereby realizing efficient penetration of electric wires and cables through the pipe.

From the state of the art to date, such an excellent effect cannot be expected at all.

[Brief description of drawings]

FIG. 1, FIG. 2 and FIG. 3 show an example of the apparatus of the present invention with respect to its main part. The numbers in the figure indicate the following. DESCRIPTION OF SYMBOLS 1 ... Pipe line, 2 ... Main tube, 3 ... Gap 4 ... Auxiliary tube, 5 ... Curved wall surface, 6 ...

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Karo Iijima 1 Taya-cho, Totsuka-ku, Yokohama-shi, Kanagawa Sumitomo Electric Industries, Ltd. Yokohama Works

Claims (5)

[Claims] 1. A lead wire for penetrating an electric wire / cable or an electric wire / cable itself is conveyed into a conduit by a Coanda spiral flow generated by high-speed feeding of a pressurized fluid, and the electric wire / cable is introduced into the conduit. A method of penetrating an electric wire / cable characterized by penetrating. 2. The method of penetrating an electric wire / cable according to claim 1, wherein a spherical body is provided at the tip of the lead wire or the electric wire / cable. 3. A method of penetrating an electric wire / cable according to claim 1, wherein the inside of the pipeline is cleaned by a Coanda spiral flow prior to passing the wire. 4. A main cylinder which is connected to an end face of a pipe line (1) through which an electric wire or a cable penetrates in the same size as the end face, and whose cross-sectional shape gradually increases in a direction opposite to the connecting face (similarly). 2), an auxiliary cylinder (4) is connected to the end opposite to the conduit (1) through an annular slit (3), and the wall (5) of the annular slit (3) on the main cylinder side. ) Is smoothly curved in the direction of the pipe (1), and means for supplying the pressurized fluid to the outside of the annular slit (3) is provided, and the pressurized fluid is fed from the slit (3) into the main cylinder. Then, a Coanda spiral flow is generated in the pipe line (1), and a lead wire or a wire / cable itself for penetrating an electric wire or a cable is introduced from the introduction port (6) of the auxiliary cylinder (4), and by the spiral flow. An electric wire characterized in that the lead wire or the electric wire / cable itself is carried into the pipeline (1). Lead or wire cable conveyor through apparatus for Buru through. 5. The conveying and penetrating device according to claim 4, wherein the width of the annular slit (3) can be arbitrarily adjusted.