JPH0318206A - Method and device for laying wire rod - Google Patents

Abstract

PURPOSE:To facilitate insertion of a wire rod into a long pipe-shaped unit by providing a technique that a pressure of fluid is decreased and successively increased halfway on the pipe-shaped unit, in the case of a method for press- feeding, inserting and laying the wire rod in the pipe-shaped unit by the fluid. CONSTITUTION:Connectors 7 are mounted halfway on a pipe-shaped unit 120, and a wire rod 1 is press-fed and inserted into the pipe-shaped unit 120 by flowing fluid in a pipe-shaped unit part 10 in the direction from a wire-in side 8 to a wire-out side 9. Most of the fluid is guided to an external part of the pipe-shaped unit part 10 from a pressure reducing hole 5, pressurized by a compressor 6, supplied to a pressure reservoir 4, attached to a pressure nozzle 2 of the pipe-shaped unit part 10 in a part B, from a pressure hole 3 and returned to the wire-out side 9 as the fluid of high pressure from a part A, and the wire rod 1 is press-fed through the pressure nozzle 2. In this way, insertion of the wire rod 1 into the long pipe-shaped unit can be facilitated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for laying a wire such as an optical fiber or a guide wire for cable conduction in a relatively long tubular body, and an apparatus directly used for carrying out the method. In particular, the present invention relates to a method and a device for laying a wire, in which the wire is forced into a tubular body by being forced into the tubular body using a fluid such as air flow, and is inserted through the wire.

[Conventional technology]

FIG. 4 shows an outline of the structure of an optical fiber cable installation device 7o as an example of this type of wire installation device (for example, Japanese Patent Laid-Open No. 104607/1983). The optical fiber 76 is introduced into the ductlet 12 from the drive wheel 77.7841m, and is forced and inserted into the ductlet 12 by the fluid supplied from the pressurizing hole 75 into the pressure cavity 74.

Reference numerals 72 and 73 denote air seals provided on the outgoing wire side and the incoming wire side, respectively, of the feed head 71 of the laying device.

This type of wire installation equipment is capable of installing optical fiber units as needed in the pre-installed cable conduit, and can also perform long-distance installation of optical fibers and other wires without connection. There are advantages such as

In particular, it is possible to lay wires over long distances without connection.
For example, the longest single length of power cables and communication cables is close to 300 m to IKm due to their transportation, so only the tubular body is combined with these cables and connected at the time of installation, and the longest single length of these cables is The ability to install optical fiber units with a length that greatly exceeds the required length eliminates the need to install optical cables with a capacity that exceeds the required capacity at the initial stage, which reduces the initial investment. It is known that the reduction in the number of points reduces the transmission loss of the optical fiber communication network and improves the quality of the communication line, which is very effective.

[Problem to be solved by the invention]

With conventional wire laying equipment, static electricity generated due to contact and friction between the inner surface of the pipe and the wire midway through the pipe,
When the conduit becomes long, there is a problem that the wire cannot be inserted through the pipe.

Another method is to insert the long wire 51 into the short tubular body I, as shown in FIG. The wire rod 51 is force-fed to the output side 59 and pushed through the next tubular body 53, and a member capable of storing the extra length L of the wire rod 51 near the connecting portion is prepared and processed.

This method results in an extra length of several IQcm or more necessary for handling the laying device and the laying device.

On the other hand, when two conventional devices are connected in series and inserted, the wire is bare on the input side of the second and subsequent devices, so it attracts dust in the air and feeds it under pressure to drive wheels and air seals. There are problems such as clogging of the device and problems of damage due to the wire being loosened or stretched due to subtle differences in the degree of pressure delivery before and after the device.

These conventional methods require a great deal of effort to connect the wire rods and pipes together, as well as to store the excess length of the wire rods, and there are problems in terms of workability and work costs, and the features of the method cannot be fully exploited. I couldn't take advantage of it.

Therefore, in order to take advantage of the advantages of this type of installation method,
There is a need to economically pressure feed and insert a wire rod into a long tubular body at a low cost.

The present invention solves the conventional problems and allows wire rods to be inserted into long tubular bodies in a short time, without the need for complicated operations such as connecting wires to each other or tubular bodies, or processing excess wire length. The object of the present invention is to provide a method for pumping and inserting a wire into a long tubular body at once, and an apparatus that can be used directly to carry out the method.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a method for laying a wire of the present invention, in which the wire is forced into a tubular body using a fluid, and the wire is laid by being inserted into the tubular body. It is characterized by having a method of lowering the pressure of the fluid and subsequently increasing the pressure of the fluid.

Note that it is effective to repeatedly lower the pressure of the fluid and then increase the pressure of the fluid, if necessary.

Further, the laying device directly used for carrying out the laying method of the present invention is a wire laying device that pressures and inserts the wire into a tubular body using a fluid, and is connected to the middle of the tubular body to form a part of the fluid flow path. a pressure reducing nozzle that narrows the flow path of the fluid supplied from the inlet side of the tubular body, and a pressure reducing hole that guides the reduced pressure fluid flowing out from the pressure reducing nozzle to the outside of the tubular body; a compressor for pressurizing the reduced pressure fluid introduced from the pressure reducing hole; a pressurizing hole for reintroducing the fluid pressurized by the compressor into the tubular body; and a pressurizing hole for reintroducing the fluid pressurized by the compressor into the tubular body; It is characterized by being equipped with a pressurizing nozzle having a pressurizing reservoir for feeding pressure to the output line side of the section.

In addition, when installing a plurality of linear bodies by force-feeding and inserting them into a plurality of tubular bodies at the same time, a plurality of the pressure reducing nozzles and pressurizing nozzles are arranged in parallel, and the depressurized fluid is delivered to the outside of the tubular bodies. A depressurizing hole for guiding the pressurized fluid to the outlet side of the tubular body and a pressurizing hole for re-feeding the pressurized fluid to the outlet side of the tubular body are arranged in common with the depressurizing nozzle and the pressurizing nozzle arranged in parallel. Effective.

[For production]

The operation of the structure of the present invention will be explained with reference to FIG.

In the conventional case where a laying device is installed at one end of a tubular body to force feed and insert a wire rod, the pressure of the fluid in the tubular body from the starting end to the end of the tubular body is as shown by the dotted line in Figure 2 (al). This pressure gradient creates a flow of gas to be supplied, forming a fluid that acts as a pumping force.

Figure 2 (bl) is a plot of the pressure gradient of the above-mentioned fluid. As shown by the dotted line, it tends to rise slightly to the right, that is, as the distance from the insertion end of the wire increases, it tends to rise slightly to the right, at the end of the tubular body. It shows an almost constant slope up to the vicinity.

On the other hand, a wire rod laying device according to the present invention was installed at positions PL and P2 in the middle of this tubular body, and the pressure of the fluid was lowered on the incoming wire side of this laying device, and the pressure of the fluid was increased on the outgoing wire side. The state of the fluid pressure and pressure gradient in the tubular body in this case are shown by solid lines in Figure 2 (al) and (bl), respectively. , a large pumping force can be obtained over the entire length of the tubular body.

At this time, the capacity of the compressor for pressurizing the fluid required is PI. As can be seen from the size of the pressure step at the P2 position, a compressor capable of pressurizing 2 to 3 kg/cm2 is usually sufficient, and a large capacity compressor is not necessary, and a small compressor may be sufficient.

With the structure according to the present invention, it is possible to install a small-sized laying device in the tubular body to increase the force for feeding the wire, and it becomes possible to force feed and insert the wire over a longer distance. Furthermore, since the pumping force is increased at important points, the time for pumping the wire rod is shortened.

Further, by installing the laying device of the present invention as a part of the tubular body in advance, problems such as mutual connection of the wire rod and the tubular body, and disposal of excess length of the linear body can be eliminated. Examples will be described below based on the drawings.

〔Example〕

FIG. 1 is a diagram showing the structure of an embodiment of the wire laying apparatus of the present invention. The installation device of this embodiment is attached to the middle of the tubular body 120 by the connector 7 to form a part of the tubular body 120. The fluid flows in the tubular body part 10 in the direction from the incoming wire side 8 to the outgoing wire side 9 in the flow path shown by the arrow, and the wire l is forced into and inserted into the tubular body 120.

Most of the fluid passes through the decompression nozzle l1 that narrows the flow path of the fluid in the tubular body part 10 in the A part, and is guided to the outside of the tubular body part 10 from the decompression hole 5.

(2) The depressurized fluid guided from the depressurizing hole 5 is pressurized by the compressor 6, and is again supplied from the pressurizing hole 3 to the pressure reservoir 4 attached to the pressurizing nozzle 2 of the tubular body portion 10 of part B, From the tubular body part 10 of the B section, the tubular body 1 is transferred as a fluid with a higher pressure than that of the A section.
20 is returned to the outgoing side 9.

The wire 1 moves forward due to inertia, passes through the pressure nozzle 2, and
At this point, the fluid is pressurized by the compressor 6 and receives a pumping force and is pumped.

Next, a specific example will be shown. As a wire rod, diameter 1mmφ
A unit with a diameter of 2 mm was prepared by covering the outer periphery of a polypropylene-coated 7-core optical fiber with a foamed polyethylene layer, and this unit was pushed through a conduit with an inner diameter of 6 mm for a length of 1 km.

When using the conventional installation equipment shown in Fig. 4, the gas pressure is 5
It took 1 hour and 40 minutes to force-feed and insert the unit through the entire length of the IKm pipeline using an air flow of 'K g/cm2. At this time, 300 m, 6
The gas pressure at the 00m position is 4.4Kg/cm, respectively.
It was 2.3.4Kg/cm2.

The installation equipment according to the present invention shown in Fig. 1 was installed at two locations in the middle of the above pipeline, the gas flow was pressurized by a compressor, and the gas pressure on the outgoing line side of the installation location was evaluated. 5.2Kg/cm” .4.9Kg/cm2
pressure was obtained. Furthermore, in this case, the unit 1 of the entire length of the conduit of IKm could be pumped in 48 minutes, and the insertion time could be significantly shortened.

Furthermore, when conventional installation equipment was used, the maximum length of units that could be pumped and inserted into the pipeline at one time was 1500 m. In contrast, the cable laying device of the present invention can be used for
It was confirmed that by installing units at intervals of 1,000 m, it was possible to force feed and insert the unit into pipes over 3,000 m in length.

FIG. 3 shows the construction of another embodiment of the wire rod laying apparatus of the present invention. In this embodiment, between the incoming line side 38 and the outgoing line side 39,
A plurality of the depressurizing nozzles 31 and pressurizing nozzles 32 of the installation equipment shown in the previous embodiment are arranged in parallel, and the fluid depressurizing holes 35 and the pressurizing nozzles arranged in parallel are With a structure in which the pressure holes 33 are commonly arranged and used, it is effective as a laying device that simultaneously pressurizes and inserts multiple wire rods into a conduit, and is also compact and can be used by storing it in a closure. can be done and is very easy to use.

The wire rod laying device according to the present invention has the following features:
There is no need to connect the wires to each other or to connect the short tubular bodies to each other, and there is no problem with processing the excess length of the wires.

Further, since the wire rod laying device according to the present invention has a simple nozzle structure, it can be manufactured easily and at a very low cost by processing metal or plastic materials, for example.

Furthermore, since the pressure gradient of the gas flow inside the tubular body is smaller toward the wire insertion end of the tubular body, the installation device of the present invention is installed more often at the wire insertion end of the tubular body than uniformly installed throughout the tubular body. Then it is effective.

Furthermore, it is effective to install the installation device at a location where a larger fluid pumping force is required, such as a portion where a curved tubular body continues or a rising portion of the tubular body.

Furthermore, if it is desired to utilize a larger fluid pumping force, the gas flow rate may be appropriately increased by introducing additional outside air in addition to the gas flowing through the tubular body. It is a mode.

〔Effect of the invention〕

As explained above, the wire rod laying method of the present invention includes arranging the laying device forming a part of the tubular body according to the present invention in the middle of the tubular body, lowering the pressure of the gas flow on the wire entry side of the laying device,
Furthermore, since the system is designed to forcefully feed a pressurized gas flow to the output wire side, it is possible to force feed and insert wires into long tubular bodies in a short time, and to connect wires to each other and short tubular bodies to each other. The wire rod can be easily pumped and inserted into a long tubular body that requires a bending part or a rising rising part, and there is no problem of processing the excess length of the wire. The effect is remarkable when applied to the installation of communication wires such as optical fibers, which need to be made longer, by being forced into and inserted into a tubular body.

・・・Drive wheel

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the construction of embodiment 2 of the wire distribution equipment of the present invention;
The drawings are diagrams for explaining the operation of the present invention, FIG. 3 is a diagram showing the structure of a second embodiment of the wire rod laying device of the present invention, FIG. 4 is a schematic diagram of the structure of an example of a conventional optical fiber cable laying device, and FIG. The figure is an explanatory diagram of a wire rod laying method using a conventional laying device.

Claims (4)

[Claims] (1) A method for laying a wire rod in which the wire rod is forced into a tubular body using a fluid and inserted therein, and is provided with a method of lowering the pressure of the fluid midway through the tubular body and then increasing the pressure of the fluid. A wire laying method characterized by: 2. The wire rod laying method according to claim 1, further comprising repeatedly lowering the pressure of the fluid and then increasing the pressure of the fluid. (3) A wire rod installation device that pressure-feeds and inserts a wire into a tubular body using a fluid, comprising: a tubular body part that is connected to the middle of the tubular body to form a part of the flow path of the fluid; and an inlet wire of the tubular body part. a pressure reduction nozzle that narrows the flow path of the fluid supplied from the side; a pressure reduction hole that guides the reduced pressure fluid flowing out from the pressure reduction nozzle to the outside of the tubular body; a compressor that pressurizes the reduced pressure fluid guided from the pressure reduction hole. , a pressurizing hole that introduces fluid pressurized by the compressor into the tubular body, and a pressurizing reservoir that pumps the pressurized fluid introduced from the pressurizing hole to the output line side of the tubular body. A wire rod laying device characterized by being equipped with a pressure nozzle. (4) A plurality of the decompression nozzles and the pressurization nozzles are arranged in parallel, and a decompression hole guides the depressurized fluid to the outside of the tubular body, and a decompression hole guides the pressurized fluid to the exit of the tubular body. 4. The wire rod laying apparatus according to claim 3, wherein the pressurizing hole for feeding the wire rod under pressure is arranged in common with the depressurizing nozzle and the pressurizing nozzle arranged in parallel.