JPH0549132A - Pipe-in-pipe piercing method - Google Patents

Abstract

PURPOSE:To enable the easy passage of a line into the duct line of very long span by attaching a compressed gas supply means to the inlet of a duct line, and generating a Coanda spiral flow inside the duct line, and piercing and transferring a conductive line or induction line into the partitioned duct inside the duct line. CONSTITUTION:The connection port 8 of a Coanda spiral flow unit 3 is abutted against the inlet of the partitioned duct 2 inside a duct line 1. A compressed gas supply means 5, for example, a compressor or a gas bomb is connected to the flow unit 3. High-pressure gas gushes along an incline 9 from a Coanda slit 4 through a distribution chamber 10, and causes a Coanda spiral flow, and goes in the direction of a partitioned duct 2, and causes negative pressure in a suction introduction port 6. If one inserts a conductive line or an introduction line into the suction introduction port 6, it is let pass into the partitioned duct 2. Hereby, it is passed easily at high speed through the duct of very long span which reaches as far as 100w or more. This is suitable for the passage of an optical fiber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe-in-pipe penetrating method. More specifically, the present invention relates to a pipe-in-pipe penetrating method that enables easy and highly efficient passage of an optical fiber or the like into a divided pipeline in a pipeline having a total length of 100 m or more.

[0002]

2. Description of the Related Art Conventionally, in office buildings, factories, communication facilities, etc., it has been often practiced to pass a conducting wire through a small-diameter pipeline such as a pipeline, and there are various conducting means therefor. Has been developed. For example, the known means for connecting these wires are:
There are a method of using compressed gas and a) method of not using compressed gas. As the former method of using compressed gas, a method of supplying compressed gas to a pipe and pushing a conducting wire is known. As an example of the latter, a method is known in which a conductor is forcibly manually pushed in by a polyethylene pipe or the like.

However, in the former method, the pipe diameter is greatly restricted, and the smaller the pipe diameter, the more difficult the passage of wire. In addition, when the diameter becomes large, there is a problem in safety because the pressure of the compressed gas increases. Moreover,
In a long-distance wire passage, a pipe passage having many bent portions, or a drum-wound pipe passage, the passage becomes extremely difficult due to contact with the inner wall of the pipe.

On the other hand, in the case of the method which does not use the compressed gas, since the conductor wire is pushed in manually, it is difficult in many cases to pass the wire, and even if it is possible to manage the wire in a short distance, the work labor is great. Will be things. Further, in recent years, it has become difficult to set a pipe burying area year by year, and it is difficult to bury a large number of pipes each time. Therefore, one or more divided pipes are arranged in one pipe, We are trying to make advanced use of the space for conductors.

This divided conduit is characterized in that it is relatively easy to replace an existing conductor. It has been considered preferable to use those divided pipes having a diameter as small as possible from the viewpoint of effective use of space. In addition, an optical fiber is increasingly used as a conducting wire penetrating such a divided conduit. However, it is difficult to pass the fiber smoothly through these split conduits without damaging the fiber depending on the conventional wiring method, and even in the method using compressed gas, the optical fiber can be used with the connecting terminal attached. It was impossible to cross the wire. For this reason, there is a drawback in the field that after the difficult wiring work is completed, it is necessary to perform the more difficult end joining of the optical fibers by using a microscope. Such work effort is a heavy burden even for an expert.

The present invention has been made in view of the above circumstances, and has solved the drawbacks of the conventional wire passing method and the means therefor, even if it is a long-distance divided pipeline having a total length of 100 m or more. It is an object of the present invention to provide a new method that enables simple and highly efficient high-speed wiring.

[0007]

In order to solve the above-mentioned problems, the present invention conveys a conductor wire or a guide wire through a divided pipeline in a pipeline by a Coanda spiral flow in the pipeline direction. And a pipe-in-pipe penetrating method. Further, the present invention allows a guide wire to penetrate into the conduit by a coanta spiral flow in the direction of the conduit, and after inserting and penetrating the divided conduit by this guide wire, a conductor or a guide wire is further applied by a Coanda spiral flow. There is also provided a pipe-impipe penetrating method characterized in that the pipe is penetrated and conveyed into the divided pipeline.

The method of the present invention has been completed by systematizing the characteristics of this Coanda spiral flow to a high degree, with the transfer method by the Coanda spiral flow already proposed by the inventor of the present invention as a principle feature. .
In other words, this Coanda spiral flow has a large difference in velocity and density between the axial flow of the fluid and its surroundings,
It shows a steerer velocity distribution, for example, the turbulence shows a value of 0.09, which is less than half of 0.2 for turbulence, and has a characteristic of forming a state different from turbulence. Moreover,
It is characterized by forming a unique spiral flow by combining the axial vector and the radial vector.

Therefore, the present invention utilizes the fact that the spiral flow is a flow converging on the pipe axis in the pipe flow, the degree of turbulence is small, and it is possible to suppress the violent contact with the pipe inner wall due to automatic vibration. The essential feature is to provide a means for conducting the flow in the divided pipeline with high efficiency by the flow and without causing damage to the conductive wire or the like.

FIG. 1 is a cross-sectional view illustrating the method of the present invention. For example, as shown in FIG. 1, a Coanda spiral flow unit (3) is connected to a divided pipeline (2) in a predetermined pipeline (1) for conducting a conductor. Compressed gas is supplied to the Coanda spiral flow unit (3) from the compressed gas supply means (5) through the Coanda slit (4) in the line direction of the divided conduit (2). In this state, a predetermined conducting wire or guiding wire (7) is inserted into the suction introduction port (6) of the Coanda spiral flow unit (3).

The conductor wire or the guide wire (7) is automatically conveyed through the spiral flow thus generated, and the conductor wire advances at high speed. As the compressed gas supply means (5), a suitable cylinder of air or a compressed gas such as N ₂ or an air compressor can be used. Even when using a cylinder, the supply pressure of compressed gas to the Coanda spiral flow unit (3) is 2 to 20 kg / cm.
The one that can be kept at about ² is sufficient.

Coanda spiral flow unit (3)
For example, as shown in FIG. 1, for example, an annular Coanda slit (4) is provided between the connection port (8) to the conduit and the suction introduction port (6) for introducing the conductor wire or the guide wire (7).
As a typical example, a structure having an inclined surface (9) in the vicinity thereof and a distribution chamber (10) for compressed gas can be shown as a typical example.

The angle of the inclined surface (9) is, for example, 5 to 70 °.
By setting the degree to a certain degree, a spiral flow is formed, and a strong negative pressure suction force is generated in the suction introduction port (6), and the negative pressure suction force guides the conducting wire or the guiding wire (7) to divide in FIG. The pipe (2) is passed through at high speed by the Coanda spiral flow. FIG. 2 exemplifies an arrangement state of the pipelines when the line is passed by this method. The conductor wire or the guide wire (7) is penetrated into the divided conduit (2) arranged in the conduit (1).

When the guide wire is penetrated without linearly penetrating the conductor wire such as an optical fiber, the conductor wire connected to the guide wire may be mechanically pulled to penetrate, or a Coanda spiral flow may be generated. It may be pulled while being pulled. Of course, in the method of this invention,
The conductor itself can be penetrated at high speed without damage.

Further, a parachute, a hollow body or the like may be provided at the tip of the conductor wire or the guide wire (7) so that the wire can be passed more smoothly. Furthermore, in the present invention, first, a guide wire is pierced by a Coanda spiral flow to arrange a divided pipe (2) in the pipe (1), and then the divided pipe (2) is arranged in the divided pipe (2). It is also within the technical scope to carry the wire through the Coanda spiral flow.

Of course, the Coanda spiral flow unit (3) may have various types and structures. That is, for example, as illustrated in FIG. 3, a seal device (11) is arranged at the suction introduction port (6) of a Coanda spiral flow unit (3) composed of a connected body, and a conductor wire provided in this seal device (11). Alternatively, the lead wire or the guide wire (7) can be fed out and penetrated by the feeding device (13) through the supply port (12) of the guide wire (7). Various methods can be adopted to attach the sealing device (11) to the suction inlet port (6) of the Coanda spiral flow unit (3), and one-touch mounting is possible, fitting means therefor, or A screw joint structure may be used.

Various shapes and structures can be adopted for the Coanda spiral flow unit (3) having the above-mentioned connected multi-stage structure, and for example, the system illustrated in FIG. 4 may be adopted.

[0018]

EXAMPLES Example 1 In the piping system (total length 129 m) as shown in FIG.
90 ° pipes are used for all corners, and 3 mm for divided pipe lines.
A nylon rope having a diameter (a tip of a hollow golf ball having a diameter of 4 cm and 10 g was attached) was penetrated.

The compressed air pressure and the wire passage time at this time were measured. FIG. 6 shows the result. 4-5 kg / cm
^In the case of ² , it can be seen that the line is completed in a short time of 13 seconds. Example 2 In Example 1, the wire was passed without attaching the hollow golf ball to the end of the nylon rope. The running time at an air pressure of 4 kg / cm ² was 17 seconds. (Comparative Example 1) In the same manner as in Example 2, it was attempted to penetrate by pressurized air by the conventional blower method, but in this case, penetration of the nylon rope was impossible. Example 3 (Comparative Example 2) 3 with a parachute (for 8 cm) attached to the tip
mm nylon rope, 2 kg / cm ² and 4 kg / cm
^The wire was passed by a Coanda spiral flow at a pressure of ² .

For comparison, a wire was also drawn by a blower system of 3 m ³ / min. The distance and speed at this time were measured. As shown in FIG. 7, the method of the present invention was excellent. As described above, the device of the present invention stably realizes high-speed and high-efficiency wiring.

Needless to say, the method of the present invention is not limited to the above examples and various modes are possible.

[0022]

As described above in detail, the present invention enables high-speed and stable wire passage.

[Brief description of drawings]

1 is a cross-sectional view illustrating the method of the present invention.

FIG. 2 is a cross-sectional view showing a state of divided pipe lines and the like.

FIG. 3 is a cross-sectional view illustrating a flow unit of the present invention.

FIG. 4 is a cross-sectional view illustrating still another flow unit.

FIG. 5 is a pipeline diagram as an example.

FIG. 6 is a correlation diagram between air pressure and transit time.

FIG. 7 is a correlation diagram between a running distance and speed.

[Explanation of symbols]

 1 Pipeline 2 Split Pipeline 3 Coanda Spiral Flow Unit 4 Coanda Slit 5 Compressed Gas Supplying Means 6 Suction Inlet 7 Conductor or Guiding Wire 8 Connection Port 9 Inclined Surface 10 Distribution Chamber 11 Sealing Device 12 Supplying Port 13 Feeding Device

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Kiyoyuki Horii 5-8-15-501 Kameguro, Meguro-ku, Tokyo (72) Inventor Toshiharu Hamade 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph Telephone Co., Ltd. (72) Inventor Yukio Shimo 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (2)

[Claims] 1. A pipe-in-pipe penetrating method, characterized in that a conducting wire or a guiding wire is conveyed through a divided pipeline in the pipeline by a Coanda spiral flow in the pipeline direction. 2. A guide wire is penetrated into the conduit by a coanta spiral flow in the direction of the conduit, the divided conduit is inserted and penetrated by the guide wire, and then the conductor or the guide wire is further separated by a Coanda spiral flow. A pipe-in-pipe penetrating method, characterized in that the pipe is conveyed through a divided pipeline.