JP5619860B2 - Aerial optical cable laying method - Google Patents

Description

  The present invention relates to a method for laying an optical cable between a plurality of utility poles.

  As shown in FIG. 3, the configuration of the aerial light equipment includes a wiring section 53 from a feeder line 51 that is a pulling point from the basement (manhole) to a dropping point 52 that is to be pulled down to the user's house, and from the dropping point 52. It consists of a withdrawal section 54 to the user's house.

  As an aerial laying method of the optical cable in the wiring section, for example, Patent Document 1 discloses the following method. That is, first, a gold wheel is attached to a support line that is stretched in advance between power poles, and a tow rope is passed through the gold wheel. And the optical cable pulled out from the cable drum installed on the ground at the wiring section start point was connected to one end of the above-mentioned routed tow rope, and the other end of the tow rope was installed on the ground at the end of the wiring section. Connect to the winch, pull the optical cable through the tow rope with the winch and pull it through the wiring section. And the front-end | tip part of an optical cable is fixed to the utility pole used as the end point of a wiring area with a fixing tool. After that, the worker climbs the poles to the electric poles in the section, adjusts the slackness of the optical cable with the electric poles by a tensioner, and fixes the electric cables to the electric poles with a fixing device.

JP 09-289714 A

  However, the above method requires an operator to adjust the rotation of the cable drum and operate the winch. In addition, the installation and removal of the gold wheel, the passage of the tow rope, the slack adjustment of the optical cable, and the optical cable Since it is necessary for the worker to reciprocate the wiring section many times for fixing or the like, there is a problem that the number of workers increases and the work time becomes long.

  Therefore, an object of the present invention is to provide an aerial optical cable laying method capable of reducing the number of workers and the work time.

The present invention has been made in order to solve the above problems, and the aerial optical cable laying method of the present invention has an electric pole as a starting point of a wiring section in which a plurality of electric poles are installed on an aerial work vehicle. A step of fixing the tip of the optical cable extending from the cable drum using the first fixing device, and feeding out the optical cable while moving the cable drum in one direction along the wiring path from the start point to the end point of the wiring section, For each intermediate utility pole in the wiring section along the wiring path, the optical cable is pulled with a predetermined tension using a manual operation or a wire tensioner on the aerial work vehicle, and the second degree is adjusted while adjusting the slackness. a step of fixing the optical cable with a retainer, a utility pole the end point of the wiring section on the aerial, to fix the optical cable by using the first fixation device Characterized in that it comprises a step.

  According to the present invention, it is possible to provide an aerial optical cable laying method capable of reducing the number of workers and the work time.

(A), (b) is a figure which shows the aerial optical cable installation method which concerns on one Embodiment of this invention. (A)-(d) is a figure which shows the conventional aerial optical cable installation method. It is a conceptual diagram of a structure of an aerial light installation.

  Here, for comparison, an example of a conventional aerial optical cable laying method will be described in detail with reference to the drawings.

2A to 2D are diagrams showing an example of a conventional aerial optical cable laying method. In the wiring section 1, a plurality of utility poles 3a, 3b, 3c, 3d, 3e, 3f and 3g are installed at intervals.
As shown in FIG. 2A, first, a cable drum 25 around which the optical cable 9 is wound is installed in the vicinity of the utility pole 3 a that is the starting point 1 a of the wiring section 1. Until the installation of the optical cable 9 is completed, one worker A feeds the optical cable 9 and adjusts the rotation of the cable drum 25.

  Next, in order to prevent the optical cable 9 and the pulling rope 31 from drooping due to their own weight, a plurality of gold wheels 29a and 29b are attached to the support line 21 at predetermined intervals. A No. 4 gold wheel 29a is attached to the electric pole 3a serving as the starting point 1a of the wiring section 1 and the electric pole at a position where the wiring path is curved by an aerial work vehicle 10, and a plurality of movable gold wheels are provided on the support line 21 between the electric poles. 29b is attached from the ground by the operating rod 35. Then, one end of the traction rope 31 is connected to the tip of the optical cable 9, and the other end of the traction rope 31 is pulled, whereby the optical cable 9 is pulled and the optical cable 9 is passed through the gold wheels 29a and 29b.

  In addition, while another worker B moves and installs the aerial work vehicle 10, the fixture 37 of the optical cable 9 is attached to each of the power poles 3a, 3b, 3c, 3d, 3e, 3f, and 3g. After pulling the optical cable 9 to the end point 1b of the wiring section 1, as shown in FIG. 2 (b), the tip of the optical cable 9 is fixed to the utility pole 3g as the end point by the fixing device 37.

  Next, as shown in FIG. 2 (c), at the starting point 1a of the wiring section 1, the worker B pulls up the optical cable by using a wire tensioner, and the workers C and D reach each of the power poles 3a up to the ending point 1b. , 3b, 3c, 3d, 3e, 3f, 3g and the power wheels 3a, 3b, 3c, 3d, 3e, 3f, 3g are removed with the operation rod 35 or the like.

  Thereafter, as shown in FIG. 2 (d), at the starting point 1a of the wiring section 1, the worker B pulls the optical cable 9 using a wire tensioner (not shown), and the workers C and D move the intermediate power pole 3b. , 3c, 3d, 3e, 3f, the slack of the optical cable 9 between each of the power poles 3a, 3b, 3c, 3d, 3e, 3f, 3g is confirmed, and the worker B again checks all the intermediate power poles 3b, 3c, 3d , 3e, 3f, the aerial work vehicle 10 is moved and installed, and the optical cable 9 is fixed from the end point 1b of the wiring section 1 toward the start point 1a. Finally, the worker B fixes the optical cable 9 to the utility pole 3a, which is the starting point 1a, and the work is completed.

  In the conventional method as described above, an operator who only carries out the feeding of the optical cable 9 including the rotation adjustment of the cable drum 25 is necessary, and the work of attaching and removing the tow rope 31 and the gold wheels 29a and 29b is necessary. Met. Further, when the optical cable 9 is pulled to adjust the slackness of the optical cable 9, the optical cable 9 from the start point 1a to the end point 1b of the wiring section 1 is pulled together, so that a large tension according to the length of the optical cable 9 is required. Become. Furthermore, it was necessary for an operator to reciprocate the wiring section 1 many times together with the aerial work vehicle 10 in order to attach the fixing device 37, fix the optical cable 9, and pull the optical cable 9.

Hereinafter, an aerial optical cable laying method according to an embodiment of the present invention will be described as an example.
As shown in FIG. 1A, in the wiring section 1, a plurality of utility poles 3a, 3b, 3c, 3d, 3e, 3f, and 3g are installed at predetermined intervals along the wiring path. The number of utility poles installed in the wiring section 1 and the distance between the utility poles are not particularly limited and can be arbitrarily determined. The optical cable used in the present embodiment can be an optical fiber cable having a plurality of optical fiber core wires and a support wire portion inside the jacket, but is not limited to this, and in the present invention, there are various types. The optical cable can be used.

  As shown in FIG. 1A, in the aerial optical cable laying method according to the present embodiment, first, an operator B uses an aerial work vehicle 10 at a tip portion 9a of an optical cable 9 fed out from a cable drum 7 mounted on a carriage 5. Above, it fixes to the utility pole 3a used as the starting point 1a of the wiring area 1 using the 1st fixing device 11. FIG. Here, the structure of the carriage 5 is not particularly limited as long as the cable drum 7 can be mounted, but it is desirable that the carriage 5 is designed to cope with a bad road and a slope. Furthermore, the cart 5 is provided with a function for preventing the idling of the cable drum, a function for preventing the cable from bending, a stopper function, a cable feeding mechanism, and the like, thereby enabling safer work.

  Next, while the worker A feeds the optical cable 9 from the cable drum 7, the carriage 5 is moved along the wiring path from the starting point 1 a of the wiring section 1 to the ending point 1 b, and the electric pole 3 a that becomes the starting point 1 a of the wiring section 1 is moved. After moving to the next utility pole (intermediate utility pole) 3b, the worker B pulls the optical cable 9 with a predetermined tension manually or using a wire tensioner, and uses the second fixing device 12 for the intermediate utility pole. Fix to 3b.

  Further, the worker A moves the optical cable 9 to the next utility pole 3c while moving the cable drum 7. Then, the worker B pulls the optical cable 9 with a predetermined tension and fixes it to the utility pole 3c using the second fixing device 12 while adjusting the slackness. By repeating this, the optical cable 9 is laid over to the utility pole 3g which is the end point 1b of the wiring section 1. And finally, as shown in FIG.1 (b), the worker B fixes the optical cable 9 to the utility pole 3g used as the end point 1b of the wiring area 1 using the 1st fixing device 11, and work is complete | finished.

  Here, since the tension | tensile_strength at the time of pulling the optical cable 9 with the intermediate | middle utility pole 3b acts on the 1st fixing tool 11 fixed to the utility pole 3a used as the starting point 1a of the wiring area 1, it is requested | required to endure the said tension | tensile_strength. At this time, the allowable tension Ta (N) required for the first fixing device 11 is determined by the following equation (1), where Tmax (N) is the maximum allowable tension of the support wire portion in the optical cable 9 and α is the safety factor. .

  From the viewpoint of labor saving during construction, if the predetermined tension is small, a tensioner having a small tensioning capacity can be used, or the operator can manually perform the tensioning.

  The tension Tb (N) acting on the optical cable 9 is as follows, assuming that the weight per unit length of the optical cable 9 is W (N / m), the slackness is d (m), and the distance between the utility poles is S (m). It is obtained by equation (2).

  For example, when laying an 8-fiber aerial optical fiber cable (W = 0.686 N / m) between utility poles (S = 30 m) while maintaining a slackness (d = 0.5 m), the above formula (2) The value of the tension Tb obtained by the above is 154N or more. In this case, it is also possible for an operator to manually pull without using a tensioner.

  In addition, since the tension of the optical cable 9 in only one direction is temporarily applied to the second fixing device 12 between the time when the optical cable 9 is fixed to a certain intermediate power pole and the time when it is fixed to the next power pole, the second fixing is performed. The instrument 12 is required to withstand the tension. Therefore, the allowable tension Tc (kN) required for the second fixing device 12 of the intermediate utility poles 3b, 3c, 3d, 3e, 3f is determined by the following equation (3).

  The 1st fixing device 11 and the 2nd fixing device 12 will not be specifically limited if the tension | tensile_strength given by said Formula (1)-(3) is accept | permitted, Use the fixing device of various structures. Can do. As the first fixing device 11 used at the start point 1a and the end point 1b of the wiring section 1, for example, a commonly used C-type insertion retainer can be used. In this case, after the support line portion of the optical cable 9 is cut and the jacket is peeled off, it is fixed by attaching a C-type insertion retainer. Further, by using a fixing device that satisfies the allowable tension shown in the above formula (1) and can be attached without peeling off the outer cover of the optical cable support line portion, it is possible to further improve the efficiency of the fixing operation.

  According to the aerial optical cable laying method of the present embodiment as described above, the front end portion 9a of the optical cable 9 extending from the cable drum 7 is fixed to the utility pole 3a that is the starting point 1a of the wiring section 1, and from the starting point 1a of the wiring section 1 The optical cable 9 is fed out while moving the cable drum 7 with the carriage 5 along the wiring path toward the end point 1b, and the optical cable 9 is fixed for each power pole along the wiring path, so that the optical cable 9 is drawn out and pulled by one worker. This makes it possible to reduce the number of workers. Further, it becomes possible to adjust and fix the slackness of the optical cable 9 by one person, and further reduce the number of workers.

  Further, according to the aerial optical cable laying method of this embodiment, the aerial laying of the optical cable 9 can be performed only by one-way movement along the wiring path from the start point 1a to the end point 1b of the wiring section 1, The working time can be further reduced as compared with the conventional method in which the work is performed by reciprocating the wiring section 1 by attaching the fixtures 11 and 12 or fixing the optical cable 9.

  In addition, after fixing the tip 9a of the optical cable 9 to the utility pole 3a, which is the starting point 1a of the wiring section 1, the optical cable 9 is fixed for each utility pole while pulling the optical cable 9 with a predetermined tension and adjusting the slackness. Since it becomes unnecessary to consider the hanging of the optical cable 9 between the utility poles, the work of attaching and removing the gold wheel is unnecessary, and the tow rope is also unnecessary, which further reduces the number of workers and shortens the work time. it can. Also, compared to the conventional method of pulling the optical cable 9 pulled from the start point 1a to the end point 1b of the wiring section 1, the necessary tension is reduced and a wire tensioner with a small wire capacity is used. Labor saving can be achieved.

  Furthermore, by using a small length and a short length of the optical cable 9 to be used, it is possible to work with a wire drawing device having a smaller wire drawing ability. Therefore, the aerial optical cable laying method of the present invention is particularly effective in rural areas where the demand density is small and the use of small-length and short optical cables is assumed. In addition, when using a short optical cable, there is a possibility that optical loss may increase as the number of connections increases, but an increase in optical loss can be suppressed by using a factory-installed connector.

Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each member, each step, etc. can be rearranged so that there is no logical contradiction, and a plurality of components, steps, etc. can be combined into one or divided. is there.

1 Wiring section
3a, 3b, 3c, 3d, 3e, 3f, 3g Telephone pole 5 Bogie 7 Cable drum 9 Cable 10 Aerial work vehicle 11 First fixing device 12 Second fixing device

Claims (1)

Fixing the tip of the optical cable extending from the cable drum using the first fixing device on the work platform at a height , to the power pole that is the starting point of the wiring section in which a plurality of power poles are installed;
The optical cable is fed out while moving the cable drum in one direction along the wiring path from the start point to the end point of the wiring section, and is installed on the aerial work vehicle for each intermediate power pole in the wiring section along the wiring path. Then, pulling the optical cable with a predetermined tension manually or using a wire tensioner, and fixing the optical cable using a second fixing device while adjusting the slackness ;
Fixing the optical cable to the utility pole serving as the end point of the wiring section on the aerial work platform using the first fixing device ;
An aerial optical cable laying method comprising:

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