JP3519336B2 - Cable removal method and cable removal aid - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable removing method and a cable removing aid for removing a predetermined cable from a plurality of cables such as communication cables laid in the same conduit.

[0002]

2. Description of the Related Art Underground pipeline facilities are constructed on the basis of a usage plan, but in recent years, there has been an increase in the number of facilities that are short of pipelines due to insufficient demand.

Further, a method of laying a plurality of cables in the same conduit is implemented based on a cable wiring method for the purpose of efficiently constructing equipment.

Originally, it is necessary to add pipeline facilities and cope with them, but large-scale road excavation work is required for pipeline expansion, and during construction, traffic congestion, nearby residents, etc. Will cause a great deal of trouble.

Therefore, the number of multi-line installations for laying a plurality of lines in the same line without increasing the number of pipes is increasing year by year.

As shown in FIG. 3, the conventional multi-strand laying method uses a conduit 1 in which a single-strand cable 11 has already been laid.
The inner pipe 13 made of a hollow polyethylene pipe having a small diameter is laid inside the inner pipe 2, and the cable 14 is additionally laid inside the inner pipe 13.

According to this construction method, even if the plural cables 11 and 14 are laid in the same pipe line 12, the inner pipe 13
Therefore, since the cables 11 and 14 are arranged independently of each other, they are not in direct contact with each other, and it is possible to remove the cables with a removal tension equivalent to the laying tension even when the cables are removed.

However, with this method, there are limits to the number of threads and outer diameters of the cables that can be accommodated in the same pipeline, and as many cables as possible are used to realize an efficient wiring method. It is necessary to lay it inside.

Therefore, some companies are already doing
We are trying to lay multiple threads in the same pipeline without using the inner pipe.

It is not difficult to lay a plurality of strips in the same pipeline, but with cable renewal and construction of companies / businesses and road managers with underground facilities such as water and gas, In some cases, the removal of cables may be necessary due to the relocation work of underground pipes that may cause obstacles.

As shown in FIG. 4, for example, the inner diameter is 80 mm.
It is possible to visually confirm that if the number of the cables 16 is increased in the limited space and the number of the cables 16 is increased in the limited space, the condition becomes like a bales. It has been confirmed by laying in a transparent experimental pipeline, and when removing an arbitrary cable from the cable 16 in such a state, the weight of the cable stacked on the upper part or the adjacent cable is shown in FIG. It has been confirmed by gravity calculation and experiments that a removal tension that is more than twice the tension required at the time of installation is required in some cases.

On the other hand, since the cable has a permissible tension, which is a safety value when laying and removing cable sections, it was thought that there would be no problem if the cable can be removed below that value.

However, in the pipeline equipment we own, there is a curved portion within one pipeline section, and at such a portion, no measures are taken when removing an arbitrary cable, The positional relationship between the bales is broken.

Further, as shown in FIG. 6, there is a case where the cable 18 to be removed has a positional relationship in which the cable 18 being provided with the service is sandwiched, and the outer case is damaged due to friction between the cables, and in the worst case. Confirms that the cable 18 being provided with the service will be broken by verifying using a transparent experimental conduit. Reference numeral 19 is a portion where the cable 18 is sandwiched between the conduits 20.

Therefore, there has been a need for a method capable of removing an arbitrary cable from a plurality of cables accommodated in the same conduit so as not to affect other cables.

Further, when a large tension is required at the time of removal, the burden on the builder is heavy and the workability is deteriorated. Therefore, a method for removing with a low tension is needed.

[0017]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to remove a predetermined cable without affecting other cables and to remove the cable with low tension. It is intended to provide a method and a cable removal aid.

[0018]

In order to achieve the above-mentioned object, the present invention is a cable removing method for removing a predetermined cable from a plurality of cables laid in the same pipe line, wherein a ring is attached to the tip. The first step of passing the rope over the cable in the pipeline, and after the first step, passing the predetermined cable through the ring at the tip of the rope and pulling the rope backward by pulling up the predetermined cable. It is characterized by including the step 2 and a third step of pulling and removing a predetermined cable after the second step.

Further, according to the present invention, in a cable removing method for removing a predetermined cable from a plurality of cables laid in the same conduit, a ring and a ring support for supporting the ring at a predetermined height are attached to the tip. The first step of passing the rope over the cable in the conduit and, after the first step, passing the predetermined cable through the ring at the end of the rope, above the cable where the ring supports are stacked.
The ring as you scoop up the cable.
The ring through the specified cable
It is characterized by comprising a second step of pulling the pulled rope backward and a third step of pulling and removing a predetermined cable after the second step.

Further, the cable removing aid of the present invention is the same.
From a cable laid in multiple pipes into a specified cable
A cable removal aid for removing a cable , characterized in that a ring through which a predetermined cable is passed is attached to the end of the rope.

Further, the cable removing aid of the present invention is the same.
From a cable laid in multiple pipes into a specified cable
A cable removal assisting tool for removing a cable , characterized in that a ring for passing a predetermined cable and a ring supporting tool for supporting the ring at a predetermined height are attached to the tip of the rope.

Further, the present invention is characterized in that, in the cable removal assisting tool, a ring, a part of which is provided so that it can be opened and closed, is used.

Further, the present invention is characterized in that, in the cable removal aid, a ring support provided with a rotary wheel is used as the ring support.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing an example of a cable removal aid according to an embodiment of the present invention. That is, an annular ring 22 is attached to the tip of the rope 21,
A ring support tool 23 for supporting the ring 22 at a predetermined height is attached to the tip of the ring 22. As the ring 22, a ring that can be opened and closed, such as a carabiner, which is generally used in mountain climbing, can be used. By using it, it can be easily attached to and detached from the cable, and is suitable for cable removal. Further, as the ring support tool 23, a plurality of rotating wheels 24 are provided in the periphery such as a leading tool for a wire used for a wire for cable laying, and a shaft is provided at a connecting portion with the ring 22. It is possible to use a cable supporting tool provided with a rotating portion 25 that rotates in the center.

FIG. 2 is a block diagram showing an example of a cable removing method according to the embodiment of the present invention. That is, for example, a pipe 26 in which the removal target cable 26 is housed in order to scoop up a cable 26 that is a target of removal of the communication cable or the like into a pipe line 25 that houses a plurality of cables 24 such as a communication cable. Pass the lead-in line to the road 25. The wire is conducted by using a wire rod or air pressure feeding which is generally performed. After passing through the wire, connect the rope 21 to the end of the lead wire, and pull out this rope 21 from the inside of the conduit 25 to replace the lead wire with the rope 21,
The rope 21 is passed through the pipe line 25. A ring 22 and a ring support tool 23 as shown in FIG. 1 are attached to the tip of the rope 21 passed through the pipe line 25. In this case, the ring 22 is attached so as to hold the removal target cable 26 so that the removal target cable 26 is passed through the ring 22. When the rope 21 to which the ring 22 through which the cable 26 to be removed is attached is towed backward, the ring support tool 23 becomes
Proceed over the stacked cables 24 to the ring 2
2 proceeds while scooping up the removal target cable 26 even when the removal target cable 26 is located below the bale stack.

When the rope 21 has been pulled, the same pipeline 25
Even if the multi-conductor cable 24 is accommodated in the pipe line 2
The optional cables 26 to be removed in the five sections can be scooped up above the stacked cables 24 without being entangled with other cables 24.

At this time, except for the removal target cable 26, the removal target cable 26 moves to the gap created by the upward movement, so the scooped up removal target cable 2
6 never returns to its original position. In other words, the pipeline we are using has a circular cross section, and if we consider a mechanical consideration to accommodate a circular object such as a cable inside the circular shape, the most stable position against the effect of gravity, that is, This is because it tries to move to the bottom of the pipeline.

Therefore, when the cable 26 to be removed moves upward, the other cable 24 moves to the lower side of the conduit 25.

Therefore, it can be said that the cable 26 to be removed does not return to its original position after being scooped up. It is visually confirmed by experiments.

According to the cable removing method of the present invention described above, if the cable to be removed is scooped up and then removed, it does not affect the cables accommodated in other same pipelines, and other cables are not affected. Since the force that has increased the weight of the cable to be removed dynamically due to the stacking of the cables is removed, the cable can be removed safely and without requiring a large force.

FIG. 7 shows a state in which a plurality of cables are accommodated in the same conduit, and when other cables are stacked, the cable to be removed is removed in the state of laying without taking any measures. The difference between the tension A in the case and the tension B in the case where the cable to be removed is picked up by the rope to which the ring and the ring support are attached according to the present invention and then removed is shown. In the figure, T is the reduction amount of the removal tension. Figure 7
As is clearer, it is understood that the tension is reduced in the present invention.

FIG. 8 shows a state in which a plurality of cables are accommodated in the same pipe line, and when other cables are stacked, the cable to be removed is removed in the state of laying without taking any measures. The difference between the tension A'in the case and the tension B'in the case where the cable to be removed is picked up by the rope attached with only the ring according to the present invention and then removed is shown.
In the figure, T'is the reduction amount of the removal tension. As apparent from FIG. 8 in the present invention is Ru divided <br/> tension is reduced.

It can be seen that a slight difference can be seen by comparing FIGS. 7 and 8. The results also show that the removal method in which the ring and the ring support device interact with each other is more effective.

[0035]

As described above, according to the present invention, a cable removing method and a cable removing aid that can remove a predetermined cable without affecting other cables and can be removed with low tension are provided. Can be provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of a cable removal assisting tool according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an example of a cable removing method according to an embodiment of the present invention.

FIG. 3 is a configuration diagram showing a conventional cable removal method.

FIG. 4 is a configuration diagram showing a stacked state of a conventional multi-strand cable accommodated in the same conduit.

FIG. 5 is an explanatory diagram showing an example in which the resultant force is examined by a vector that the stacked cables influence each other when accommodating a plurality of cables in the same conventional pipeline.

FIG. 6 is an explanatory diagram showing a state in which a cable to be removed has a positional relationship in which another cable is sandwiched in a pipeline when a plurality of cables are accommodated in the same pipeline in the related art.

FIG. 7 is a characteristic diagram showing a tension when a cable is removed according to an example of the present invention, compared with a conventional one.

FIG. 8 is a characteristic diagram showing the tension when a cable is removed according to another example of the present invention in comparison with the conventional tension.

[Explanation of symbols]

21 rope 22 ring 23 Ring support 24 Cables housed in conduit 25 pipelines 26 Cables to be removed

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-248131 (JP, A) JP-A-10-322831 (JP, A) JP-A-2000-125429 (JP, A) JP-A-2001-251718 ( (58) Fields investigated (Int.Cl. ⁷ , DB name) H02G 1/06 H02G 9/06

Claims (6)

(57) [Claims] 1. A cable removing method for removing a predetermined cable from a plurality of cables laid in the same pipeline, the first step of passing a rope having a ring attached to the cable over the cable in the pipeline. After the first step, a predetermined cable is passed through the ring at the end of the rope, and the rope is pulled out backward by pulling up the predetermined cable, and after the second step, a predetermined step is performed. And a third step of pulling and removing the cable. 2. A cable removing method for removing a predetermined cable from a plurality of cables laid in the same conduit, wherein a rope having a ring and a ring support for supporting the ring at a predetermined height is attached to the rope. The first step of passing the cable over the cable in the pipeline, and after the first step, the predetermined cable is passed through the ring at the tip of the rope, and the ring support is stacked.
Go above the cable and the ring should not scoop up the cable.
A ring that goes through a certain cable so that you can go ahead
A cable removing method comprising: a second step of pulling a rope attached to a rearward direction; and a third step of pulling and removing a predetermined cable after the second step. 3. A cable having a plurality of strips laid in the same pipeline.
With a cable removal aid that removes the specified cable from the
There is a cable removal aid that has a ring attached to the end of the rope that allows the specified cable to pass through . 4. A cable in which a plurality of strips are laid in the same pipeline.
With a cable removal aid that removes the specified cable from the
A cable removal aid characterized in that a ring for passing a predetermined cable and a ring support for supporting the ring at a predetermined height are attached to the tip of the rope. 5. The ring used is a ring in which a part of the ring is openable and closable.
Or the cable removal aid described in 4. 6. The cable removal aid according to claim 3, 4 or 5, wherein a ring support provided with a rotating wheel is used as the ring support.