JP5120899B2 - Optical fiber cable wiring method and optical fiber piping - Google Patents

Description

  The present invention relates to an optical fiber cable wiring method in which an optical fiber cable is inserted therein and the optical fiber cable is routed to a wiring position, and an optical fiber pipe used in the optical fiber cable.

  Conventionally, in a collective drop cable or an indoor cable, a plurality of optical fiber cables are gathered to form a base line, and the collective base line is inserted into a protective tube. When taking out the optical fiber cable to be used from the assembly ground wire, cut one of the assembly ground wires, connect the connector to the cut end, and separately connect the optical fiber cable to the wiring position through the connector. Laying.

  As such an aggregate optical fiber drop cable, for example, an aggregated light in which a plurality of optical elements are arranged around the support line portion and a branching portion that branches each optical element portion in advance according to the wiring form is provided. There is a fiber drop cable (Patent Document 1).

JP 2004-125914 A

  However, when adding a branch part using such a cable, it is necessary to cut the internal cable at the branch part, and the remaining part of the cut optical fiber cable is wasted. There is a problem that a wasteful optical fiber cable that is not left is left in the pipe. In addition, since a connector is always required at the cutting portion, there is a problem that connection work of the connector is required and workability is poor. In addition, when a large number of optical fiber cables are used as a ground wire, there is a problem that the required optical fiber cable is not easily identified and taken out from the ground wire.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an optical fiber cable wiring method and the like that are excellent in workability and enable wiring without wasting the optical fiber cable. .

In order to achieve the above-mentioned object, the first invention is an optical fiber cable wiring method in which an optical fiber cable is wired to each floor of a structure composed of a plurality of floors. a tubular-body outlet is formed of, said at outlet and wound are bands across the tube, provided with an optical fiber cable is inserted into the tube, a plurality of said optical fiber cable A plurality of optical fiber groups are formed, and a part of each optical fiber group in the longitudinal direction is exposed to the outside of the tubular body at each outlet, and the plurality of optical fiber groups are exposed. Of these, only the optical fiber groups exposed toward the outside of the tube at the respective outlets are held outside the band and are held in a state of being distinguished from the other optical fiber groups. light With Aiba piping from the outlet of the optical fiber pipe provided together in a substantially vertical direction to said structure, pull the upper end portion of the optical fiber group held in the outside of the band, the said optical fiber group The optical fiber cable wiring method is characterized in that the optical fiber cable is distributed to the respective wiring positions on the corresponding floor in a manner separated from the optical fiber cable.

  The average length of the optical fiber cable constituting the optical fiber group is different for each optical fiber group, and the average length of the optical fiber cable constituting the optical fiber group corresponding to each floor as it goes to the upper floor. It is desirable that the length becomes longer.

  The average length Ln of the optical fiber cable constituting the optical fiber group wired on the nth floor is different from the average length L1 of the optical fiber cable constituting the optical fiber group wired on the first floor on each floor. If the height difference between them is H, it is desirable that Ln = L1 + (n−1) · H.

  The plurality of optical fiber cables constituting the optical fiber group have different lengths depending on the horizontal wiring position on each floor, and after the optical fiber group is drawn out from the outlet, the length corresponding to the wiring position on each floor The optical fiber cable may be routed to each wiring position.

  The lower end portion of the optical fiber cable exposed from the lower end of the optical fiber pipe is connected to a coil around which the optical fiber cable is wound, and after the optical fiber cable is wired to a wiring position, the optical fiber cable May be wound with a coil, and the optical fiber cable may be cut near the lower end of the optical fiber pipe.

  The optical fiber pipe is further arranged in the horizontal direction by bending or connection, and an internal optical fiber cable is taken out from an outlet provided at a predetermined position of the optical fiber pipe arranged in the horizontal direction, You may wire to a wiring position.

  According to the first invention, since the optical fiber group is configured and held in a state where the optical fiber group is exposed from the outlet, the optical fiber cable can be easily taken out and can be reliably identified. Further, since there is no need to cut the optical fiber cable, a useless optical fiber cable does not occur.

  In particular, the average length of the optical fiber cable constituting each optical fiber group corresponding to each floor (hereinafter simply referred to as “the length of the optical fiber group”) becomes longer as it goes to the upper floor. The length becomes a length corresponding to the wiring position (wiring floor), and the optical fiber cable is not wasted and can be used efficiently. In this case, the length corresponding to each floor can be made more efficiently by increasing the length of the optical fiber group by the height difference (floor difference length) H of the floor as it goes to the upper floor.

  In addition, the length of the optical fiber cable constituting the same optical fiber group is made to correspond to the length corresponding to the wiring position in the horizontal direction, and the length of the optical fiber cable is changed to make the optical fiber cable more Waste can be eliminated and the optical fiber cable can be used effectively.

  In addition, by connecting the optical fiber cable led out from below the pipe to the coil of the optical fiber cable, the optical fiber cable is unwound from the coil by the required length when wiring the optical fiber cable. By winding the extra length with a coil, the optical fiber cable can be used more effectively.

  In each floor, the optical fiber cable can be wired more easily by bending the pipe in the horizontal direction or separately connecting the pipe in the horizontal direction and providing an outlet near the wiring position.

2nd invention is optical fiber piping used for the structure which consists of multiple floors, Comprising: The tubular body in which several extraction openings were formed at predetermined intervals, and the whole said tubular body is wound in the said extraction opening A band and an optical fiber cable inserted through the tube , wherein one end of the tube is closed, the other end of the tube is open, and an internal optical fiber cable. And a plurality of optical fiber groups in which a plurality of the optical fiber cables are grouped are formed, and a part of each of the optical fiber groups in the longitudinal direction is outside the tube body at each of the outlets. Of the plurality of optical fiber groups, only the optical fiber group exposed to the outside of the tube body at each take-out port is held outside the band, Differentiated from the optical fiber group Held in the state, the tip position of the optical fiber group is an optical fiber pipe, characterized in that the interior of the tubular body.

  The average length of the optical fiber cable constituting the optical fiber group is different for each optical fiber group, and as the position of the extraction port goes to the closed end of the optical fiber pipe, the extraction port The average length of the optical fiber cable that constitutes the optical fiber group exposed in (1) may be increased.

  According to the second invention, since the optical fiber group is held in an exposed state from the outlet of the pipe, it is easy to wire the internal optical fiber cable to the wiring position, and the identification can be performed reliably. it can. In particular, by increasing the length of the optical fiber group as it goes to the end of the pipe (the side installed toward the upper floor), the optical fiber cable can be used efficiently.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in workability | operativity and can provide the wiring method of an optical fiber cable etc. which can be wired without wasting an optical fiber cable.

The perspective view which shows the wiring structure 1. FIG. It is a figure which shows the piping structure used for the wiring structure 1, (a) is a whole elevation view, (b) is the A section enlarged view of (a), (c) is the BB sectional drawing of (b). It is sectional drawing which shows the piping structure used for the wiring structure 1, (a) is whole sectional drawing, (b) is the A section enlarged view of (a). The figure which shows the state which installed the protective tube 9 in the structure 3. FIG. The figure which shows the process of taking out the optical fiber cable 7 (optical fiber group 17) from the protective tube 9. FIG. The figure which shows the state which wired the optical fiber cable. The figure which shows the state which bent the protective tube 9 on the top floor. It is a figure which shows the cable storage box 21, (a) is a perspective view, (b) is a perspective perspective view, (c) is sectional drawing. The figure which shows the state which installs the optical fiber cable 7 by installing the cable storage box 21 under the protective tube 9. FIG. The figure which shows the state which installs the optical fiber cable 7 by installing the cable storage box 21 in each floor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a wiring structure 1. A protective tube 9 is installed in a substantially vertical direction on the side of the structure 3 composed of a plurality of floors (an example of the third floor is shown in the figure). A plurality of optical fiber cables 7 are inserted into the protective tube 9. The end of the optical fiber cable 7 is led out from the lower end of the protective tube 9 and connected to a wiring box or the like (not shown) installed near the lower end of the protective tube 9.

  The optical fiber cable 7 is taken out from the position corresponding to each floor of the protective tube 9, and the optical fiber cable 7 is wired to the respective inlets 5 (wiring positions) on each floor. In the following description, a state in which the optical fiber cable 7 is inserted into the protective tube 9 is simply referred to as an optical fiber pipe. That is, the optical fiber pipe is composed of a protective tube 9, an optical fiber cable 7, and the like.

  Next, details of the optical fiber piping will be described. 2 and 3 are diagrams showing the configuration of the optical fiber piping. FIG. 2 (a) is an overall elevation view, FIG. 2 (b) is an enlarged view of part A in FIG. 2 (a), and FIG. 2 (c). FIG. 3B is a sectional view taken along the line BB in FIG. 2B, FIG. 3A is an overall sectional view, and FIG. 3B is an enlarged view of a portion A in FIG.

  The end (upper end) of the protective tube 9 is closed by a lid 15 and the lower end is open. The protective tube 9 may be made of, for example, flexible polyethylene, and may be a corrugated tube or a straight tube. In the case of a corrugated tube, a spiral groove may be used. It may be a tube or an independent grooved tube. Further, the size of the protective tube 9 is appropriately determined depending on the number of optical fiber cables 7 inserted therein, but is, for example, about 10 to 20 mm.

  The protective tube 9 is formed with a take-out port 11 at a predetermined interval. The take-out port 11 is a hole for taking out the internal optical fiber cable 7 to the outside of the protective tube 9. The installation interval of the outlets 11 is, for example, about 2.5 to 3 m, and substantially corresponds to the height difference (interval in the height direction of each floor) of each floor of the structure to which the protective tube 9 is attached.

  A plurality of optical fiber cables 7 are inserted into the protective tube 9. Here, a group of a plurality of optical fiber cables 7 is referred to as an optical fiber group 17. That is, the optical fiber group 17 is formed by combining a plurality of optical fiber cables 7 with a tape or the like. Therefore, a plurality of optical fiber groups 17 are inserted into the protective tube 9.

  The number of the optical fiber cables 7 constituting the optical fiber group 17 corresponds to the number of wirings on each floor. In the example of FIG. 1, there are four service entrances 5 on each floor. What is necessary is just to comprise the optical fiber group 17 with the optical fiber cable 7. FIG. The number of optical fiber groups 17 corresponds to the number of floors, and in the example of FIG. 1, three optical fiber groups 17 may be configured. The number of optical fiber cables 7 and optical fiber groups 17 set is not limited to the example shown in the figure. For example, about 20 to 30 optical fiber cables 7 are usually inserted into the protective tube 9.

  The plurality of optical fiber groups 17 have different lengths. That is, the length of the optical fiber cable 7 constituting the optical fiber group 17 is different for each optical fiber group. Therefore, the position of the tip 19 of the optical fiber group in the protective tube 9 is different for each optical fiber group 17.

  The plurality of optical fiber groups 17 are exposed to the outside of the protective tube 9 through the corresponding extraction ports 11. That is, one optical fiber group 17 is exposed at one outlet 11. An optical fiber that is exposed as it goes from the outlet 11 on the lower end side (the end side opposite to the lid 15) of the protective tube 9 to the outlet 11 on the upper end side (the end side where the lid 15 is provided). The length of the group 17 is sequentially increased. That is, the length of the optical fiber group 17 exposed at the lowermost extraction port 11 is the shortest, and the tip portion of the optical fiber group 17 exposed here is inside the protective tube 9 than the tip portions of the other optical fiber groups 17. Located below.

  Similarly, the length of the optical fiber group 17 exposed at the uppermost extraction port 11 is the longest, and the tip portion of the optical fiber group 17 exposed here is the tip portion of another optical fiber group 17 inside the protective tube 9. Located above. Note that the tip positions of the optical fiber groups 17 do not necessarily have to be different positions. In this case, the lengths of the optical fiber groups 17 protruding from the lower end of the protective tube 9 may be different. That is, the shortest optical fiber group 17 may have the shortest length from the lower end of the protective tube 9, and the longest optical fiber group 17 may have the longest length from the lower end of the protective tube 9.

  As shown in FIGS. 2B and 3B, the takeout port 11 is provided with a band 13 so as to wrap around the entire protective tube 9 including the takeout port 11. The band 13 may be in any form as long as it can be wound around and held by the protective tube 9. As shown in FIG. 2C, the optical fiber group 17 exposed outward at the take-out port 11 is located outside the band 13, and the other optical fiber groups 17 are held inside the protective tube 9. The That is, at the extraction port 11, only one optical fiber group 17 is distinguished from the other optical fiber groups 17 and is held outside the band 13 (toward the outside of the protective tube 9). The optical fiber groups 17 are color-coded with a tape so that each can be identified, and the plurality of optical fiber cables 7 constituting the optical fiber group 17 are also color-coded so that they can be identified. Yes.

  Such an optical fiber pipe is assembled as follows. A take-out port 11 is formed at a predetermined position of the protective tube 9 that has been cut to a required length in advance. A plurality of optical fiber cables 7 having a predetermined length are combined with a tape or the like to form an optical fiber group 17, and the optical fiber group 17 is inserted from one end of the protective tube 9. At this time, it is desirable to attach and fix a cap to the tip of the optical fiber group 17. If the tip of the cap has a circular arc shape in cross section and the size of the arc at the tip of the cap is larger than the groove width of the recess on the inner surface of the protective tube, the tip of the cap will not get caught in the groove. That is, the optical fiber group 17 can be inserted into the protective tube without the tip of the optical fiber cable being caught by the irregularities inside the protective tube. Further, the tip of the optical fiber cable 7 may be bent and inserted.

  The long optical fiber group 17 or the short optical fiber group 17 is inserted into the protective tube 9 in order, and a corresponding part of the optical fiber group 17 in the longitudinal direction (part other than the end) is protected by the corresponding outlet 11. Pulled out of the tube 9 and held outside the protective tube 9 by the band 13. By repeating the above, all optical fiber groups 17 are inserted into the protective tubes, and a part of the optical fiber group 17 is exposed and held outward at each outlet 11 to form an optical fiber pipe. The

  Next, the construction method of the optical fiber wiring structure using the optical fiber pipe of the present invention will be described. First, as shown in FIG. 4, a protective tube 9 (optical fiber piping) is installed on the side of the structure 3. At this time, the position of the take-out port is set in advance so that the take-out port comes to a predetermined height position on each floor. In addition, the optical fiber cable 7 which has come out from the lower end of the protective tube 9 may be connected in advance to the wiring box, or may be connected to the wiring box or the like after completion of the wiring work.

  Next, the optical fiber cable 7 (optical fiber group 17) is taken out from each outlet 11. FIG. 5 is a view showing a method of taking out the optical fiber cable 7 (optical fiber group 17) from the protective tube 9. As shown in FIG. First, from the state shown in FIG. 5A, as shown in FIG. 5B, the optical fiber group 17 exposed from the extraction port 11 is pulled out (in the direction of arrow C in the figure).

  Further, the optical fiber group 17 is pulled out, and as shown in FIG. 5C, the optical fiber group tip 19 is taken out from the take-out port 11 (in the direction of arrow D in the figure). Next, as shown in FIG. 5D, the required length of the optical fiber group 17 is pulled out as necessary (in the direction of arrow E in the figure). When the lower end of the optical fiber cable 7 is already connected to a wiring box or the like and there is no extra length on the lower end side, the optical fiber cable 7 is not pulled out as shown in FIG.

  After pulling out the optical fiber group 17, the optical fiber group 17 is separated into the respective optical fiber cables 7, and the necessary optical fiber cables 7 are wired to the inlets 5 which are the respective wiring positions. In the lead-in port 5, a connector or the like may be connected separately, or the optical fiber cable 7 may be wired directly into the room. Thus, the optical fiber cable 7 is wired to each floor and each service entrance.

  In addition, when wiring to each drawing-in port 5 is performed individually, the corresponding optical fiber group 17 is not completely taken out. For example, as shown in FIG. It is also possible to take out and draw out only the necessary optical fiber cable 7 for wiring and return the remaining optical fiber group 17 to the protective tube 9.

  FIG. 6 is a diagram illustrating a state in which the wiring has been completed. Here, the height difference (height direction) of each floor is H, and the horizontal distances between the respective inlets 5 are W1 to W3, respectively. As shown in the figure, the average length of the optical fiber cable 7 wired on the second floor is longer by H than the average length of the optical fiber cable 7 wired on the first floor. That is, if the length of the optical fiber group 17 used for the first floor is L1, the length of the optical fiber group 17 used for the nth floor may be Ln = L1 + (n−1) · H. desirable. By doing in this way, it becomes an optical fiber group of the suitable length according to the height difference of each floor, and can reduce an extra optical fiber cable.

  Similarly, it is desirable that the lengths of the optical fiber cables 7 constituting the same optical fiber group are not all the same, but are changed according to the position of the lead-in port 5. For example, the length of the optical fiber cable 7 used for the lead-in port 5 closest to the first protection tube on the first floor is set to l1, and the distance between the lead-in ports 5 is set to W1, W2, Assuming W3, it is desirable that l2 = l1 + W1, l3 = l2 + W2 = l1 + W1 + W2, and l4 = l3 + W3 = l1 + W1 + W2 + W3. By doing in this way, it becomes an optical fiber cable of the suitable length according to the position of the drawing-in port 5, and can reduce an excess optical fiber cable.

  In addition, when making the length of each optical fiber cable which comprises one optical fiber group all the same, the length to the farthest drawing-in port is set, and according to the position of the drawing-in port 5, What is necessary is just to cut | disconnect the optical fiber cable 7. FIG.

  FIG. 7 is a diagram showing another embodiment, and is a diagram showing a state in which the protective tube 9a is bent on the top floor and arranged in the horizontal direction. The first and second floors of the protective tube 9a are the same as the protective tube 9, and the protective tube 9 is extended only in the third floor.

  In the part installed in the horizontal direction on the top floor, an extraction port may be provided in the vicinity of the drawing-in port 5. Therefore, on the top floor, the optical fiber cable may be taken out from the takeout port without forming an optical fiber group. In this case, the optical fiber cable 7 may be distinguished by a band or the like at each outlet. In FIG. 7, the protection tube on the top floor is bent, but a horizontal protection tube may be separately connected to the vertical protection tube 9 without bending the protection tube. In this case, a horizontal protective tube may be provided on any other floor, not limited to the top floor.

  In the above embodiment, the structure (floor and number of rooms) of the structure 3 is not limited to the illustrated mode. In addition, a separate cover or the like may be provided at the take-out port 11. The cover may be provided so as to close the hole and prevent moisture or small animals from entering the cover before the optical fiber group 17 is taken out or after the optical fiber group 17 is taken out.

  As described above, according to the wiring structure 1 of the present embodiment, wiring work is extremely easy. Moreover, since the optical fiber cable 7 previously wired to each floor comprises the optical fiber group 17, identification is easy and it is excellent in workability | operativity. Moreover, the extra optical fiber cable 7 can be reduced.

  In particular, the length of the optical fiber group and the length of the optical fiber cable 7 constituting the optical fiber group and the length of the optical fiber cable 7 constituting the optical fiber group are set in advance according to the height of each floor and according to the position of the lead-in port 5 in each floor. Waste can be reduced.

  Next, an optical fiber wiring method according to the second embodiment will be described. 8A and 8B are diagrams showing the cable storage box 21. FIG. 8A is a perspective view, FIG. 8B is a perspective perspective view, and FIG. 8C is a cross-sectional view. Note that in the following embodiments, the same reference numerals as those in FIGS. 1 to 6 are given to configurations having the same functions as those in the first embodiment, and redundant descriptions are omitted. In the second embodiment, a cable storage box 21 is used.

  The cable storage box 21 mainly includes a box body 22, a coil 23, and the like. A plurality of coils 23 are provided in parallel inside the box body 22. An optical fiber cable 7 is wound around the coil 23. Each coil 23 is independent and can rotate independently about the shaft 25.

  On the side surface of the box body 22, take-out holes 27 are provided at positions corresponding to the arrangement of the respective coils 23. A guide 29 is provided inside the take-out hole 27. That is, the optical fiber cable 7 wound around the coil 23 is led out from the take-out hole 27 through the guide 29.

  A plurality of slits 31 are formed on the upper surface of the box 22. The slit 31 corresponds to the position of the side plate of the coil 23, and a part of the side plate of each coil 23 is exposed above the box 22 from the slit 31. The operator can rotate the coil 23 by rotating the side plate of the coil 23 exposed from the slit 31.

  When the cable storage box 21 is in use, the optical fiber cable can be easily taken out by pulling the optical fiber cable 7 led out from the take-out hole 27. At this time, for example, by pulling a plurality of optical fiber cables simultaneously, the plurality of optical fiber cables can be pulled out with substantially the same length. Further, the optical fiber cable 7 drawn out excessively can be rewound by rotating the coil 23 in the reverse direction by rotating the exposed portion of each coil.

  Next, a wiring method using the cable storage box 21 will be described. FIG. 9 is a diagram illustrating a wiring method in a state where the cable storage box 21 is used. The cable storage box 21 is configured integrally with the optical fiber cable 7 protruding from the lower end side of the protective tube 9. That is, the optical fiber cable 7 (optical fiber group 17) inside the protective tube 9 is connected to the coil of the cable storage box 21.

  It is desirable to assign one cable storage box 21 for each optical fiber group 17. For example, in the example of FIG. 9, since there are four lead-in ports 5 on each floor, the optical fiber group 17 is composed of four optical fiber cables 7. Therefore, if the cable storage box 21 composed of four coils is used, the four optical fiber cables 7 drawn from one cable storage box 21 can be made into one optical fiber group 17.

  First, as shown on the first floor of FIG. 9, the optical fiber group 17 is taken out from the protective tube 9 by the above-described method and pulled out to the farthest drawing-in port 5. At this time, the optical fiber cable 7 constituting the optical fiber group is pulled out from the cable storage box 21.

  Next, as shown on the second floor of FIG. 9, the optical fiber group 17 is separated to form an optical fiber cable 7, and wired to each drawing port 5. After wiring, as shown on the third floor, the extra optical fiber cable 7 is rewound in the direction of the cable storage box 21 (arrow F in the figure). After the excess optical fiber cable 7 is rewound, the optical fiber cable 7 is cut at a necessary position near the cable storage box 21 and connected to a wiring box or the like. This completes the wiring.

  In addition, as shown in FIG. 10, you may wire by installing the cable storage box 21 in the vicinity of the farthest end part from the protective tube 9 of each floor. In this case, first, an empty protective tube 9 is installed in the structure 3. Next, as shown on the first floor in the figure, the optical fiber cable 7 is pulled out from the cable storage box 21 (in the direction of arrow G in the figure), inserted into the protective tube 9 (the outlet), and the optical fiber is inserted from the lower end of the protective tube 9. Pull out the end of the cable 7 to the required length. At this time, if necessary, the end of the optical fiber cable 7 may be connected to a wiring box or the like.

  Next, as shown on the second floor in the figure, the optical fiber cable 7 is cut and wired at the position of each drawing-in port 5. Finally, as shown on the third floor in the figure, the extra optical fiber cable 7 is rewound in the direction of the cable storage box 21 (in the direction of arrow H in the figure). Thus, the wiring work is completed.

  According to the second embodiment, the same effects as in the first embodiment can be obtained. Moreover, since the cable storage box 21 can draw out a plurality of optical fiber cables at a time and can rewind an extra optical fiber cable 7, the optical fiber cable can be used effectively and is wasteful. Can be reduced.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1 ......... Wiring structure 3 ......... Structure 5 ...... Inlet 7 ...... Optical fiber cable 9 ......... Protection tube 11 ...... Outlet 13 ...... Band 15 ...... Lid 17 ... ... Optical fiber group 19 ... Optical fiber group tip 21 ... Cable housing box 22 ... Box body 23 ... Coil 25 ... Shaft 27 ... Extraction hole 31 ... Slit

Claims (8)

An optical fiber cable wiring method for wiring an optical fiber cable to each floor of a structure composed of a plurality of floors,
A tubular body in which a plurality of outlets are formed at intervals corresponding to substantially the height difference between the floors;
A band wound around the entire tubular body at the outlet;
An optical fiber cable inserted through the tube;
And a plurality of optical fiber groups in which a plurality of the optical fiber cables are grouped are formed, and a part in the longitudinal direction of each of the optical fiber groups is outwardly of the tubular body at each of the extraction ports. Of the plurality of optical fiber groups, only the optical fiber group exposed to the outside of the tubular body at each extraction port is held outside the band, and the other light beams Using optical fiber piping that is held in a state that is distinguished from the fiber group ,
An upper end portion of the optical fiber group held outside the band is pulled out from the extraction port of the optical fiber pipe provided in the structure in a substantially vertical direction, and the optical fiber group is separated from the optical fiber cable. An optical fiber cable wiring method, wherein the optical fiber cable is wired to each wiring position on a corresponding floor.   The average length of the optical fiber cable constituting the optical fiber group is different for each optical fiber group, and the average length of the optical fiber cable constituting the optical fiber group corresponding to each floor as it goes to the upper floor. 2. The optical fiber cable wiring method according to claim 1, wherein the length of the optical fiber cable is increased.   The average length Ln of the optical fiber cable constituting the optical fiber group wired on the nth floor is different from the average length L1 of the optical fiber cable constituting the optical fiber group wired on the first floor on each floor. The optical fiber cable wiring method according to claim 1 or 2, wherein Ln = L1 + (n-1) · H, where H is a height difference between the two.   The plurality of optical fiber cables constituting the optical fiber group have different lengths depending on the horizontal wiring position on each floor, and after the optical fiber group is drawn out from the outlet, the length corresponding to the wiring position on each floor 4. The method of wiring an optical fiber cable according to claim 1, wherein the optical fiber cable is wired to each wiring position.   The lower end portion of the optical fiber cable exposed from the lower end of the optical fiber pipe is connected to a coil around which the optical fiber cable is wound, and after the optical fiber cable is wired to a wiring position, the optical fiber cable 2. The optical fiber cable wiring method according to claim 1, wherein the extra length portion is wound with a coil, and the optical fiber cable is cut in the vicinity of the lower end of the optical fiber pipe.   The optical fiber pipe is further arranged in the horizontal direction by bending or connection, and an internal optical fiber cable is taken out from an outlet provided at a predetermined position of the optical fiber pipe arranged in the horizontal direction, 6. The optical fiber cable wiring method according to claim 1, wherein wiring is performed at a wiring position. An optical fiber pipe used for a structure consisting of a plurality of floors,
A tube having a plurality of outlets formed at predetermined intervals;
A band wound around the entire tubular body at the outlet;
An optical fiber cable inserted through the tube;
Comprising
One end of the tube is closed, the other end of the tube is open, an internal optical fiber cable is exposed, and an optical fiber in which a plurality of the optical fiber cables are combined A plurality of groups are formed, and a part of the longitudinal direction of each of the optical fiber groups is exposed to the outside of the tubular body at each of the extraction ports, and each of the plurality of optical fiber groups is Only the optical fiber group exposed to the outside of the tube at the take-out port is held outside the band and is held in a state of being distinguished from other optical fiber groups, and the tip of the optical fiber group An optical fiber pipe characterized in that the position is inside the pipe body . The average length of the optical fiber cable constituting the optical fiber group is different for each optical fiber group, and as the position of the extraction port goes to the closed end of the optical fiber pipe, the extraction port The optical fiber pipe according to claim 7, wherein an average length of the optical fiber cable constituting the optical fiber group exposed at is increased.

Images