JPH1198630A - Cable stringing method and cable protecting ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable stringing method which eliminates inefficiency in workability due to mounting job of suspension brackets, which includes a conventional cable hanger and the further improvement in the efficiency for the job. SOLUTION: A messenger wire 1 is strung onto poles 50, constructed upright in a row and an expanding chain coil 6 of synthetic resin is placed on one pole side end part of the messenger wire 1 stretched between poles. The pole side end part of the chain coil 6 is fixed to the pole, and a cable 2 is inserted from the fixed side end part. The end part of the cable 2 and the unfixed side end part of the chain coil 6 are moved together towards the other pole side, while extending the chain coil 6. Then, the unfixed side end part of the chain coil 6 is fixed to the other pole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying a cable such as a communication cable and a cable protection ring used for the same, and more particularly to a method for laying a cable for further improving work efficiency and a cable protection ring used for the same.

[0002]

2. Description of the Related Art Generally, when a communication cable such as a telegraph or an optical communication is installed, a messenger wire 1 is stretched as a tensile material as shown in FIG. The communication cable 2 is suspended while attaching a metal hanging tool 3 such as a cable hanger at a pitch of.

In such a cable erection work, first, a messenger wire 1 is erected between utility poles, and pulleys called “wheels” are hung at several places in the longitudinal direction of the messenger wire 1. Next, while temporarily guiding the communication cable 2 to these pulleys and parallel to the messenger wire 1, the temporarily installed cable 2 is sequentially moved at a pitch of 50 to 60 cm with respect to the messenger wire 1 while FIG. As described above, and pulleys are removed.

[0004] However, the mounting work of the above-mentioned hanging tool is performed while a worker rides on an aerial work vehicle and has many hanging tools.
It takes a lot of time and skill to move while moving 50 to 60 cm at a high place, which is a major cause that the working efficiency cannot be improved.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem of workability mainly caused by the work of attaching a hanging tool as described above, and to improve the work efficiency at once. Is to provide. Another object of the present invention is to provide a cable protection ring used in the cable erection method.

[0006]

According to the present invention, there is provided a cable laying method for laying a messenger wire on a plurality of electric poles erected in a row, the messenger wire being stretched between the electric poles. An extendable chain coil is extrapolated to one end of the telephone pole, the end of the chain coil is fixed, and a cable is inserted from the fixed end. The fixed-side end is moved to the other pole side to fix the non-fixed-side end of the chain coil.

In another cable laying method of the present invention, a messenger wire is laid on a plurality of electric poles erected in a row, and an elastic end is provided on one end of the messenger wire stretched between the electric poles on one side of the electric pole. Extrapolating the chain coil, fixing the end of the chain coil on the utility pole side, inserting a cord from the fixed end, and joining the end of the cord and the non-fixed end of the chain coil together. While moving to the other pole side to fix the non-fixed side end of the chain coil,
A cable is connected to an end of the pull cord, and the pull rope is pulled back in the opposite direction to the above, so that the cable is inserted inside the chain coil.

[0008] Still another cable erection method of the present invention is as follows.
After stretching a stretchable chain coil between each pole of a plurality of poles erected in a row, a messenger wire is stretched inside the chain coil, and the messenger wire is further stretched inside the chain coil. It is characterized in that a cable is inserted in parallel or directly through a cord.

[0009] Still another cable erection method of the present invention is as follows.
A messenger wire is erected on a plurality of electric poles erected in a row, and guide means are suspended at several places of the messenger wires stretched between the electric poles. The cable and the messenger wire are extended in parallel with the messenger wire, and an elastic chain coil is extended outside the cable and the messenger wire, and the guide means is removed. is there.

In each of these methods of the present invention, a chain coil is extrapolated outside the messenger wire and the cable, and the cable is supported on the messenger wire at regular intervals simply by operating the coil coil in an extended state. That is, since it is not necessary to attach a hanger such as a cable hanger which has been an obstacle to the workability in the conventional erection method, the erection work of the cable can be performed in a short time without special skill. .

In the above-described cable laying method, when the chain coil is made of synthetic resin in order to make it electrically insulating, the chain coil may be burned out due to a fire or the like. However, if a cable protection ring is attached at an appropriate interval in the longitudinal direction of this chain coil, a messenger wire is inserted inside the upper part, and a cable is inserted inside the cable protection ring, if the chain coil is burned out, Even so, the cable protection ring supports the cable to prevent it from falling.

The structure of the cable protection ring is as follows.
A guide member having a guide concave portion through which the messenger wire is inserted is connected to both ends of a support wire formed in a semicircular arc shape, and a locking portion fixed to the chain coil is rotatably connected to the outside of the guide member. Preferably, a guide coil made of a synthetic resin is rotatably inserted around the outer periphery of the support wire. The cable protection ring not only prevents the cable from dropping in the event of a fire as described above, but also improves the workability of the installation by smoothly moving the cable by the guide coil during the installation of the cable.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. 1 (A) and (B)
4 illustrates steps of a method for erection of a communication cable according to the present invention. First, as shown in FIG. 1 (A), mounting brackets 51 are respectively mounted on a number of telephone poles 50 erected in a row on the ground, and the respective telephone poles 50, 50 are connected via the mounting brackets 51.
Hang the messenger wire 1 between them. Since the messenger wire 1 is a tensile member for suspending the cable 2, a stranded wire in which a plurality of steel wires are twisted is used. A stretchable chain coil 6 made of synthetic resin as shown in FIG. 4 is extrapolated to one end of the messenger wire 1 stretched in this manner, which is closer to one of the utility poles.

A cable protection ring 7 as shown in FIG. 6 is attached to the chain coil 6 at appropriate intervals at several places by caulking its clip 7a (FIG. 2). The time of extrapolating the chain coil 6 with the cable protection rings 7 attached at appropriate intervals to the messenger wire 1 may be performed after the messenger wire 1 is erected as described above, or the messenger wire 1 may be erected between telephone poles. At the same time, it may be extrapolated at the same time.

First, the chain coil 6 extrapolated to the messenger wire 1 is fixed to the messenger wire 1 at the end near the utility pole by a fixing metal 9 (see FIG. 2). Alternatively, the fixing to the mounting bracket 51 on the power pole 50 may be connected and fixed, or the fixing to the messenger wire 1 and the fixing to the mounting bracket 51 for the power pole 50 may be used together.

After the end of the chain coil 6 near the power pole is fixed as described above, the inside of the chain coil 6 is moved from the fixed end to the non-fixed end as shown in FIG. And insert the cable 2. Cable 2 is telephone pole 5
The pulley 52 is continuously pulled out from the creel 20 via a pulley 52 provided at a position 0, and is pulled to the opposite electric pole 50 while extending the chain coil 6 together with the non-fixed end of the chain coil 6. At the opposite end, the non-fixed end of the chain coil 6 is fixed, and the end of the cable 2 extends between the next utility poles. As a method of fixing the non-fixed side end of the chain coil 6, similarly to the method performed at the first end,
It may be fixed on the messenger wire 1 with the fixing metal 9 or connected and fixed to the mounting metal 51 on the utility pole 50.
Alternatively, both may be used in combination.

As shown in FIG. 3, the messenger wire 1 and the cable 2 stretched between utility poles are restrained inside the chain coil 6, and the cable 2 is suspended from the messenger wire 1 at regular intervals. State. The cable protection ring 7 previously attached to the chain coil 6 has a messenger wire 1
And the cable 2 is inserted inside.

Thereafter, the above-mentioned operations are sequentially repeated between adjacent utility poles, whereby a cable can be laid over the entire utility pole row. According to the above-described cable laying method of the present invention, a cable is hung at a predetermined interval on a messenger wire by simply using a stretchable chain coil made of synthetic resin and extending the coil coil. The step of mounting the tool can be omitted. Therefore, the cable erection work can be simplified, and the work time can be further reduced. Also,
Since the chain coil is made of a synthetic resin, the weight is reduced, and the workability can be improved in this respect as well.

In addition, a synthetic resin chain coil may be burned out due to a fire or the like. However, if the above-described cable protection ring is used in combination, even when the chain coil is burned out, the cable hangs or falls off. Can be prevented. The chain coil 6 used in the cable erection method of the present invention is configured, for example, as shown in FIG. 4, and the coil body 6a is continuously formed in a spiral shape from a synthetic resin monofilament. This coil body 6
Sleeves 6b are respectively attached to both ends of a as required, but this sleeve 6b is not always necessary and may not be attached according to the purpose.

The synthetic resin monofilament of the coil body may have a circular or non-circular cross section, but preferably has a non-circular cross section. For non-circular sections,
It is desirable that a twist is given spirally in the longitudinal direction. That is, as shown in FIG. 4B, it has a non-circular cross section such as a trilobal cross section, and is twisted in the longitudinal direction to form a spiral shape. With such a non-circular cross section and a spiral shape, it is possible to prevent wind noise and snow adhesion which are likely to occur when the cable is installed at a high place.

The coil body may be composed of a single wire of a synthetic resin monofilament or a stranded wire of a plurality of monofilaments. When using a plurality of monofilament strands, the number of twists is 10 to 4
It is preferable to be in the range of 0 T / M. Regarding the thickness of the coil body, regardless of whether it is a single monofilament single wire or a plurality of stranded wires, its circumscribed circle diameter is 2.0 to 6.0 mm,
Preferably, it is set to be 4.0 to 5.0 mm. By setting such a thickness, optimal rigidity, strength, and elasticity can be imparted to the chain coil. If the thickness is less than 2.0 mm, the rigidity of the chain coil is insufficient, and if it is 6.0 mm or more, the rigidity is too large, and the workability of erection of the cable is reduced.

Since the synthetic resin chain coil is elastic and can be extended and contracted, its length when contracted (when not extended) (original length)
From L _O (FIG. 4 (A)), it can be extended to a length L ₁ (FIG. 5). The original length L _O is preferably as short as possible in order to facilitate the operation of inserting the end of the cable into the inside of the chain coil, but conversely, it is better to increase the installation length L ₁ when using the installation. Improve work efficiency.

From these viewpoints, when the diameter of the circumscribed circle of the coil body is 2.0 to 6.0 mm and the diameter of the chain coil in the non-extended state is 30 to 120 mm, the original length L _{O in} the non-extended state of the chain coil is obtained. The ratio L ₁ / L _O of the length L ₁ at the time of erection and extension is preferably in the range of 10 to 30, more preferably 15 to 25.

The synthetic resin constituting the chain coil is preferably a fiber-forming thermoplastic resin, and examples thereof include polyester, polyamide, and polyolefin. Of these, polyester is particularly preferred. Examples of the polyester include polyethylene terephthalate, polybutylene terephthalate, and a copolymerized polyester obtained by copolymerizing a third component such as adipic acid, isophthalic acid, isophthalic acid sulfonate, and polyethylene glycol with these.Especially, polyethylene terephthalate is most suitable. It is.

As the polyamide, nylon 6, nylon 66, nylon 610, nylon 612, nylon 1
1, nylon 12, and a copolymerized polyamide comprising a combination of these nylon components. If necessary, these thermoplastic resins may contain ordinary additives such as a heat-resistant agent, a weathering agent, a light-proofing agent, an antioxidant, an antistatic agent, a dye and a pigment.

As a cable protection ring used in the cable erection method of the present invention, a configuration as shown in FIG. 6 is preferable. In the cable protection ring 7, a guide coil 7e made of a synthetic resin filament is rotatably covered on the outer periphery of a metal support wire 7b bent in a semicircular arc shape. Both ends of a metal guide member 7c and a cover plate 7d are inserted into both end portions of the support wire 7b, and can be detachably attached by bending the end portions of the wire.

At the center of the guide member 7c, there is formed a guide recess 7cg which is bent in a semi-circular shape through which the messenger wire 1 is slidably inserted. The metal cover plate is provided on the opening side of the guide recess 7cg. 7d is provided so as to be openable and closable. A plastically deformable metal clip 7a is rotatably connected to the outside of the guide recess 7cg of the guide member 7c via a metal connecting pin 7f. As the maximum diameter D ₂ between the extrapolated guide coils 7e to clip 7a and the guide member 7c of the cable protection ring 7, the inner diameter D ₁ of the time of non-extension of the chain coil 6
It is preferable that it is equal to or less than.

As described above, the cable protection ring 7 is attached to the chain coil 6 at an appropriate interval before attaching the chain coil 6 to the messenger wire 1 as shown in FIG. As a mounting method, first, the coil body 6a of the chain coil 6 is inserted into the clip 7a, and the clip 7a is crushed to integrate the guide member 7c. Further, the messenger wire 1 is passed through the guide recess 7cg of the guide member 7c, and the cover plate 7d is covered on the guide recess 7cg so as to be overlapped thereon, and both ends of the overlapped guide member 7c and the cover plate 7d are provided with both ends of the support wire 7b. The wire ends are each penetrated and bent to form a ring as a whole.

After the cable 2 is inserted through the inside of the cable protection ring 7 into the chain coil 6 in which the cable protection ring 7 is attached at several places at appropriate intervals as described above, as shown in FIG. When the end of the cable 2 and the end of the non-fixed side of the chain coil 6 are extended while the chain coil 6 is extended, the cable protection ring 7 is connected to the messenger wire 1 via the guide recess 7cg.
The guide coil 7 of the support wire 7b
Since the cable 2 is moved while sliding on “e”, the cable erection work can be performed smoothly.

When the chain coil 6 is extended while the cable 2 is being pulled, the angle of the coil main body 6a with respect to the messenger wire 1 is gradually reduced in accordance with the extension. However, the coil body 6
Since the clip 7a fixed to a is rotatable about the connecting pin 7f with respect to the guide member 7c, the clip 7a smoothly follows the angle change of the coil body 6a, and the chain coil 6 and the messenger wire 1 It can be moved smoothly without causing excessive twisting between them.

FIG. 7 illustrates another cable erection method of the present invention using the above-described chain coil and cable protection ring. In this cable erection method, the messenger wire 1 is first erected on the electric pole 50, and the cable protection is attached to one end of the messenger wire 1 stretched between the electric poles 50, 50, similarly to the above-mentioned FIG. The chain coil 6 with the ring 7 attached is extrapolated.

Next, in FIG. 1B, the step of inserting the cable 2 is replaced with the insertion of the cable 2 and
While pulling it out from the reel 80. Then, the end of the drawstring 8 is extended to the opposite pole side together with the non-fixed end while the chain coil 6 is extended,
At the opposite end, the non-fixed end of the chain coil 6 is fixed on the messenger wire 1 or is fixed to the mounting bracket 51 on the utility pole 50 on the opposite side. Further, the end of the tow rope 8 extends to the outside of the outermost utility pole 50, as shown in FIG.
(A).

At the end of the drawstring 8 extended as described above, the reel 20 is installed outside the outermost electric pole 50,
Since the cable 2 is pulled out from the reel 20, the end of the cable 2 and the end of the drawstring 8 are connected. Next, when the reel 80 is rotated in the reverse direction to rewind the pulling line 8, as shown in FIG.
Is pulled into the chain coil 6 between the utility poles 50, 50, and is in a stretched state. That is, the cable 2 is suspended from the messenger wire 1 via the chain coil 6.

FIG. 8 illustrates still another cable laying method according to the present invention. This cable erection method
As shown in FIG. 8 (A), first, the mounting brackets 51 are mounted on the electric poles 50 erected in a row, and the chain coil 6 is stretched between the electric poles 50, 50 by using the mounting brackets 51. Cable protection rings 7 are attached to the chain coil 6 at appropriate intervals in advance in the same manner as described above.

Next, as shown in FIG. 8 (B), the messenger wire 1 is pulled out from the reel 10 installed on one outside of the electric pole row, and inserted into the inside of the chain coil 6 so as to be inserted into the outermost electric pole on the opposite side. The messenger wire 1 is erected by extending the wire to 50. Then, FIG.
As shown in (C), the drawstring 8 is pulled out from the reel 80 installed on the outermost side opposite to the electric pole row, and inserted into the chain coil 6 to be extended to the outermost electric pole 50 on the opposite side. The end of the cable 2 is pulled out and connected to the end of the pull cord 8 from the reel 20 installed at that position.

Next, as shown in FIG. 8D, the reel 2 is rewound and the pull cord 8 is pulled in the opposite direction to the above, whereby the cable 2 is inserted into the inside of the chain coil 6. That is, the cable 2 is suspended from the messenger wire 1 via the chain coil 6.
However, the step of FIG. 8D may be performed directly after the step of FIG. 8B without setting the pull cord 8 as in FIG. 8C.

FIG. 9 illustrates still another cable laying method of the present invention. This cable erection method
As shown in FIG. 9 (A), first, the messenger wire 1 is erected on the electric pole 50, and the pulleys 52 are hung at appropriate intervals on the messenger wire 1 stretched between the electric poles 50, 50. Next, as shown in FIG. 9 (B), the drawstring 8 is pulled out from the reel 80 installed on the outermost side of the telephone pole array, and is extended via the pulley 52 to the outermost side on the opposite side of the telephone pole array. The end of the cable 2 pulled out from the opposite reel 20 is connected to the end of the pull cord 8.

Next, as shown in FIG.
To pull the pull cord 8 in the opposite direction to that described above, so that the cable 2 is stretched in parallel with the messenger wire 1. However, in the step of FIG. 8C, the pulling line 8 is not set as shown in FIG.
It may be performed directly after the step of FIG.

Finally, as shown in FIG.
The chain coil 6 is extrapolated outside the cable 2 and the messenger wire 1 between 0 and 50. Also, the messenger wire 1 is inserted into the guide recess 7cg of the guide member 7c and the cover plate 7d is overlapped with the cable protection ring 7 previously attached at appropriate intervals, and the guide member 7c and the cover plate Both ends of the support wire 7b, into which the cable 2 is inserted, penetrate through both ends of the support wire 7d to form a ring shape.

In the case of the cable laying method shown in FIGS. 7 to 9 as well, as in the case of FIG. 1, the cable is suspended on the messenger wire at a predetermined interval only by extending the elastic resin-made elastic chain coil. Therefore, the operation time can be shortened by the amount of omitting the operation of attaching the conventional hanging tool, and the efficiency of the cable erection work can be further improved. In addition, since the chain coil is made of a synthetic resin, it is lightweight, and the above-described workability can be further improved. In addition, even when the synthetic resin chain coil is burned out due to a fire or the like, the cable protection ring can prevent the cable from sagging or falling off.

[0041]

As described above, according to the present invention, a chain coil can be extrapolated to the outside of a messenger wire and a cable, and the cable can be suspended from the messenger wire at a constant interval only by extending the chain coil. Since the operation of attaching a conventional hanging tool such as a cable hanger is omitted, the cable can be erected in a very short time without special skill.

When the chain coil is made of synthetic resin and is used in combination with a cable protection ring, even if the chain coil is burned out due to a fire or the like, the cable protection ring holds the cable and drops. Can be prevented.

[Brief description of the drawings]

FIGS. 1A and 1B are process diagrams illustrating a cable erection method of the present invention.

FIG. 2 is an enlarged side view showing a main part of the cable erection method.

FIG. 3 is a side view showing, in an enlarged manner, a main part of a state of a cable and the like installed by the cable installation method.

4A is a side view of a chain coil used in the cable erection method, and FIG. 4B is a cross-sectional view of a coil body of the chain coil.

FIG. 5 is a side view when the chain coil of FIG. 4 is extended.

FIG. 6 is a front view of a cable protection ring used in the cable erection method.

FIGS. 7A and 7B are process diagrams illustrating another cable erection method of the present invention.

FIGS. 8 (A), (B), (C), and (D) are process diagrams illustrating still another cable erection method of the present invention.

FIGS. 9A, 9B, 9C, and 9D are process diagrams illustrating still another cable erection method according to the present invention.

FIG. 10 is a side view of a cable installed by a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Messenger wire 2 Cable 6 Chain coil 6a Coil main body 7 Cable protection ring 7a Clip 7b Support wire 7c Guide member 7d Cover plate 7e Guide coil 7cg Guide recess 8 Pulling line 9 Fixing bracket 50 Telegraph pole 51 Mounting bracket

Claims (6)

[Claims] 1. A messenger wire is erected on a plurality of electric poles erected in a row, and an elastic chain coil is extrapolated at one end of the messenger wire stretched between the electric poles on one side of the electric pole. Fixing the pole end of the chain coil, inserting a cable from the fixed end, moving both the end of the cable and the non-fixed end of the chain coil to the other pole, A method of laying a cable that fixes the non-fixed end of the chain coil. 2. A messenger wire is erected on a plurality of electric poles erected in a row, and an elastic chain coil is extrapolated to one end of the messenger wire stretched between the electric poles on one side of the electric pole. Along with fixing the pole end of the chain coil, a pull cord is inserted from the fixed end, and both the end of the pull cord and the non-fixed end of the chain coil are moved to the other pole. While fixing the non-fixed side end of the chain coil, a cable is connected to the end of the pull cord, and the pull rope is pulled back in the opposite direction to insert the cable inside the chain coil. The method of erection of the cable to be done. 3. A stretchable chain coil is stretched between utility poles of a plurality of utility poles erected in a row, and a messenger wire is stretched inside the chain coil. A cable laying method in which a cable is inserted directly or through a cord in parallel with the messenger wire. 4. A messenger wire is erected on a plurality of electric poles erected in a row, and guide means are hung at several places of the messenger wires stretched between the electric poles, and a cable is guided while being guided by the guide means. A cable which is installed parallel to the messenger wire directly or via a pull cord, stretched so as to extrapolate an elastic chain coil outside the cable and the messenger wire, and removes the guide means. Construction method. 5. The chain coil is made of a synthetic resin, and a cable protection ring is attached at an appropriate interval in a longitudinal direction of the chain coil, and the messenger wire is inserted into an upper inside of the cable protection ring. Claim 1 to allow the cable to pass through
4. The method for erection of a cable according to any one of 4. 6. A guide member having a guide concave portion through which the messenger wire is inserted is connected to both ends of a support wire formed in a semicircular arc shape, and a locking portion fixed to the chain coil is turned outside the guide member. Movably connected,
6. A cable protection ring used in the cable erection method according to claim 5, wherein a guide coil made of a synthetic resin is rotatably inserted around the outer periphery of the support wire.