JP4274376B2 - Building with optical branch cable - Google Patents

Description

The present invention relates to a building provided with an optical branch cable.

Conventionally, in a building such as a condominium, when an optical fiber cable (indoor cable) is wired to many doors on each floor, a method as shown in FIG. 7 has been used. In the method illustrated in FIG. 7, an optical fiber cable (indoor cable) 500 is connected from an optical patch panel 100 of a main power distribution panel (MDF) located on the basement of a building such as an apartment to the information distribution of each house. Since the panel 200, the media converter, and the like are installed, it is necessary to install as many optical fiber cables (indoor cables) as the number of houses, and the wiring cost is high.
Therefore, a wiring method for laying an optical fiber cable (indoor cable) in a building such as a condominium is desired to reduce the wiring cost, and various methods have been proposed (for example, see Patent Document 1). ).

The optical communication trunk cable shown in Patent Document 1 has a cable configuration shown in FIG. The optical communication trunk cable 110 includes a tape slot type optical communication trunk cable main body 103 provided with 20 four-core tape optical cores 131 (see FIG. 9) and five pieces connected to the four-core tape optical core 131. The branch part 104 and five branch case bodies 107 that can open and close the branch part 104 are configured. Each branch unit 104 is provided with an MT connector 108. The MT connector 108 is connected to an MT connector (not shown) provided at a terminal portion of an FO (Fanout) cable 105 installed at a wiring work site described later.
The optical communication trunk cable 110 of Patent Document 1 is manufactured so as to be suitable for on-site wiring as a cable extending in the vertical direction of a building, that is, a trunk cable alone.
Japanese Patent Laid-Open No. 2001-147358 (pages 2 to 3, FIGS. 3, 5, 9, and 10)

  As shown in FIG. 10, the optical communication trunk cable 110 described in Patent Document 1 is installed in a building 120 such as an office building, and then has an FO (Fanout) cable 105 and an optical wiring box 125 installed on each floor. Wiring work to each door is required. For example, as shown in FIG. 11, first, the connection work between the MT connector 108 of the branching portion 104 of the optical communication trunk cable 110 and the MT connector 109 provided at one end of the FO cable 105 provided on each floor is performed. . Next, the connection work between the SC connector 126 provided at the other end of the FO cable 105 and the SC connector 127 provided in the optical wiring box 125 is further performed. Moreover, although the optical fiber cable wired from the optical wiring box 125 to each house is not described in this patent document 1, the wiring work of this optical fiber cable is further required in the wiring construction site.

  As described above, when an optical fiber is wired to each door in a building 120 such as an office building using the optical communication trunk cable 110 of Patent Document 1, a branching operation at the branching unit 104 or a subsequent optical fiber is performed. The work of connecting the cable is newly required at the construction site of buildings, condominiums, etc., and there is a problem that the burden of wiring work is large and the wiring cost is high.

An object of the present invention is to provide a building provided with an optical branch cable that can reduce the wiring work amount of an optical fiber cable wired to a building such as a building or a condominium, and can reduce the wiring cost. is there.

The building in which the optical branch cable according to claim 1 is provided includes one trunk cable, a large number of indoor cables with respect to the trunk cable, and one branch portion. The indoor cable is wired one by one to each door to be wired in the building, and the length of the indoor cable is determined by the location where the branch is to be provided in the building and the building. are those in length corresponding to the distance between the information distribution board provided in each house of the inner is adjusted at the factory, the trunk cable serves as a indoor type multicore cable, and, the main line In the cable, the length of the cable is adjusted in the factory to a length corresponding to the distance between the place where the branch portion is to be provided in the building and the power panel provided in the building. The branch is A terminal portion of a main line cable is connected, and one of the branch portions is a connection portion in which an optical fiber branched from one end of the main line cable and a plurality of optical fibers of the indoor cable are connected der protects the is, characterized in that formed by arranging a plurality of the optical branching cable manufactured in advance the factory.

Buildings were provided with optical branching cable according to claim 2, in the building which is disposed an optical branch cable according to claim 1, an optical fiber branched from the terminal of the trunk line cable at the branch portion The connection of the indoor cable with the optical fiber is a fusion splicing.

  According to the first aspect of the present invention, the branch portion is provided at the terminal of the trunk cable, and the lengths of the trunk cable and the indoor cable to be laid are adjusted in advance. No new cable cutting / branching work or connection work is required. Therefore, it is possible to reduce the wiring work amount of the optical fiber cable and reduce the wiring cost.

Further, according to the invention described in claim 1, fiber length of trunk cable and indoor cable laid because it is pre-adjusted to the length corresponding to the wiring distance, the wiring construction site trunk cable and indoor cables Since new cutting / branching work and connection work can be avoided, the amount of optical fiber cable wiring work can be reduced, and the wiring cost can be reduced .
Since the trunk cable is an indoor type multi-core cable, the outer diameter of the trunk cable can be reduced even if the trunk cable is multi-core. An indoor type multi-core cable has a smaller outer diameter than a slot cable using a slot, and can be easily laid even when a cable conduit is narrow, such as an existing high-rise apartment.
According to the second aspect of the present invention, since the optical fiber of the trunk cable and the optical fiber of the indoor cable are connected by fusion bonding which is relatively easy to work, the connection cost can be reduced and the size of the branch portion can be reduced. Can be planned.

  The present invention relates to an optical fiber and an indoor cable branched from a terminal of the trunk cable, to which a trunk cable composed of a multi-core optical fiber having an optical fiber, a number of indoor cables, and a terminal of the trunk cable are connected. It is composed of a branch portion to which an optical fiber is connected, and the lengths of the main cable and the indoor cable are adjusted to predetermined lengths, respectively, and are manufactured in advance as optical branch cables in the factory. And this optical branch cable is implement | achieved by being conveyed by the building constructed | installed, and wired to the corresponding floor and door in the building.

Hereinafter, an embodiment of a building in which the optical branch cable according to the present invention is arranged will be described in detail.
FIG. 1 schematically shows an embodiment of a building provided with an optical branch cable according to the present invention. In FIG. 1, (a) schematically shows a method of routing an optical branch cable according to the present invention in an apartment, and (b) schematically shows the configuration of the optical branch cable according to the present invention.

  The apartment 20 illustrated in FIG. 1A has 6 floors and 8 units on each floor. In this apartment 20, three optical branch cables 10 (10a, 10b, 10c) are wired. These optical branch cables 10a, 10b, and 10c are preliminarily manufactured in the factory and transported to the apartment 20, and then wired between the power panel 1 of the apartment 20 and the information distribution board 2 of each house. As shown in FIG. 1B, the optical branch cable 10 includes a main line cable 3, an indoor cable 4, and a branch portion 5. The trunk cable 3 is provided with a multi-core optical fiber (described later) having an optical fiber having a number of cores capable of corresponding to wiring to each door. One terminal of the trunk cable 3 is connected to the power panel 1, and the other terminal is connected to the branching unit 5. In the branch portion 5 connected to the terminal of the trunk cable 3, a multi-core optical fiber (described later) of the trunk cable 3 is branched into an optical fiber, and the branched optical fiber and the indoor cable 4. These optical fibers are connected by fusion splicing described later. The indoor cable 4 has a two-core optical fiber that will be described later, and is wired to each door. As for this indoor cable 4, one terminal of the indoor cable 4 is connected to the branch part 5, and the other terminal is connected to the information distribution board 2 of each house. Here, the number of indoor cables 4 only needs to be prepared in accordance with the number of houses.

  The optical branch cable 10 thus configured is wired for the number of optical fiber cores used for the trunk cable 3, the number of branch indoor cables 4, the length of the trunk cable 3, and each door of the indoor cable 4. It is manufactured in the factory based on each section head.

  This point will be described in detail by taking the optical branch cable 10a illustrated in FIG. After the optical branch cable 10a is connected to the power panel 1, the trunk cable 3a is pulled up, and the branch portion 5a is fixed at the middle position or the sixth floor position of the fifth floor and the sixth floor of the apartment 20, from which the branch indoor cable 4a Are wired to the 6th and 5th floor doors. In this case, the number of houses per floor is eight, and since one indoor cable 4a (one two-core optical fiber) is distributed to each house, the total number of cores per floor is 16. Therefore, the total number of core cables 3a distributed to the 5th and 6th floors of the apartment 20 is 32. Since there are eight indoor cables 4a wired to each floor, the total number of wires wired to the fifth and sixth floors of the apartment 20 is 16, and the total number of cores is 32. That is, the total number of cores of the trunk cable 3a needs 32 cores that is the same as the total number of cores of the indoor cable 4a. The length of the trunk cable 3a is such that one terminal of the trunk cable 3a is connected to the power panel 1 and the branching part 5a is provided at the other terminal, so that the length corresponds to the distance from the power panel 1 to the above position. Need to be adjusted. On the other hand, since one terminal of the indoor cable 4a is connected to the branch part 5a and the other terminal is connected to the information distribution board 2 of each door, the indoor cable 4a is connected to the branch part 5a to 5 fixed on the sixth floor position. It is necessary to adjust to the length corresponding to the distance to each door on the floor and the sixth floor.

  In consideration of the total number of core cables 3 and the required strip length, the total number of indoor cables 4, the required strip length of each indoor cable 4, and the arrangement of the branch portions 5, the optical branch cable 10 is preliminarily set in the factory. It is manufactured. For this reason, the wiring work associated with the laying of buildings such as condominiums does not require new cable cutting / branching work or connection work at the wiring work site, so optical fiber cables wired to buildings such as buildings and condominiums. The amount of wiring work is reduced, and the wiring cost is reduced. In addition, although the structure and wiring method of the optical branch cable 10 of a present Example were demonstrated taking the apartment 20 as an example, it is not limited to the apartment 20, but buildings, such as a new installation or an existing house where a fiber optic cable is installed, a building, etc. On the other hand, it can be used without any problem. Further, the optical branch cable 10 of this embodiment is manufactured by adjusting the necessary lengths of the main cable 3 and the indoor cable 4 in advance, and the branch portion 5 is provided at the terminal of the main cable 3. Not only the height of the apartment 20 but also the height of a building such as a new or existing house or building where an optical fiber cable is installed can be easily accommodated without any problem.

  Next, the trunk cable 3 used for the optical branch cable 10 will be described in detail. FIG. 2 shows the configuration of the trunk cable 3. In FIG. 2, the trunk cable 3 includes 32 optical fiber cores 31, a tension member 32 disposed so as to sandwich the optical fiber core 31, and the optical fiber core wire 31 and the tension member 32. It is comprised from the sheath 33 to coat | cover.

  The optical fiber core 31 has four split-type eight-fiber cores 34 and uses an indoor type multi-core cable composed of a total of 32 optical fibers 36. Has the advantage that the outer diameter of the main cable 3 can be reduced. Here, the reason why the indoor type multi-core cable is used for the optical fiber core wire 31 is that the outer diameter of the cable can be made thinner than a slot cable using a slot, and the cable conduit of an existing high-rise apartment or the like. This is because it can be easily laid even when the width is small. The tension member 32 restricts the extension of the optical fiber cable so that excessive tension does not occur in the optical fiber core wire 31 due to the tension when laying the laying optical fiber cable, and is also referred to as a well tension body. The tension member 32 is made of steel, FRP (glass fiber reinforced plastic), or the like. The sheath 33 is made of a thermoplastic resin such as polyethylene (PE), polyvinyl chloride (PVC), or flame retardant polyethylene.

  The trunk cable 3 configured as described above is manufactured in advance in a factory based on a length corresponding to a wiring distance in a building such as a laid apartment. Therefore, no new cable cutting / branching work or connection work is performed at the wiring work site. In the present embodiment, the trunk cable 3 uses the 32 optical fiber cores 31, but is not necessarily limited to this, and the 16 optical fiber cores or light exceeding the 32 cores are not necessarily limited thereto. A fiber core wire may be used. However, when the number exceeds 32 cores, it is more preferable to use a cable structure that is advantageous to many cores such as a slot cable in order to sufficiently secure mechanical characteristics such as bending characteristics and lateral pressure characteristics of the cables.

  Next, the indoor cable 4 used for the optical branch cable 10 will be described in detail. FIG. 3 shows the configuration of the indoor cable 4. In FIG. 3, the indoor cable 4 includes a single optical fiber core wire 41, a tension member 42 disposed so as to sandwich the optical fiber core wire 41, and the optical fiber core wire 41 and the tension member 42. It is comprised from the sheath 43 to coat | cover.

  The optical fiber core wire 41 (two optical fibers 44) of the indoor cable 4 is connected to the four optical fibers 36 branched from the terminal of the trunk cable 3 at the branch portion 5. The tension member 32 restricts the extension of the optical fiber cable so that the optical fiber core wire 41 is not excessively stretched by the tension when the laying optical fiber cable is laid, and is also referred to as a well tension body. The tension member 42 is made of steel, FRP (glass fiber reinforced plastic), or the like. The sheath 43 is made of a thermoplastic resin such as polyethylene (PE), polyvinyl chloride (PVC), or flame retardant polyethylene.

  The indoor cable 4 configured as described above is manufactured in advance in a factory based on a length corresponding to a wiring distance in a building such as a laid apartment. Therefore, no new cable cutting / branching work or connection work is performed at the wiring work site.

  Next, the branching portion 5 provided at the end of the trunk cable 3 of the optical branch cable 10 and connecting the trunk cable 3 and the indoor cable 4 will be described in detail. The branch portion 5 is a dedicated small branch box that protects the connection portion between the optical fiber 36 of the trunk cable 3 and the optical fiber 44 of the indoor cable 4. The structure of this branching part 5 is shown in FIGS. FIG. 4 shows the branching section 5 including a branching section main body 51, a lower end face board 60, an upper end face board 70, and a lid (not shown) that covers the branching section main body 51. 5 (a) is a front view of the lower end face plate 60 of the branch part 5, FIG. 5 (b) is a side view of the lower end face board 60 of the branch part 5, and FIG. The rear view of the lower end face board 60 of the branch part 5 is shown. 6 (a) is a rear view of the upper end face board 70 of the branching section 5, FIG. 6 (b) is a side view of the upper end face board 70 of the branching section 5, and FIG. The front view of the upper end face board 70 of the branch part 5 is shown.

  As shown in FIG. 4, the branch portion main body 51 includes turn guide portions 52, 52, fusion sleeve fixing portions 53, 53, and screw fixing portions 55, 55, 55. The turn guide portion 52 is a guide for preventing the optical fiber from being bent when bending the extra length of the optical fiber 36 branched from the end of the trunk cable 3 or the optical fiber 44 of the indoor cable 4. The fusion sleeve fixing portion 53 is a fixing portion of the fusion sleeve 54 into which a connection portion between the optical fiber 36 of the trunk cable 3 and the optical fiber 44 of the indoor cable 4 connected by a method described later is inserted. The screw fixing portion 55 fixes the lid (not shown) and the branch portion main body 51 with a screw inserted into the screw fixing portion 55.

  Further, as shown in the front view of FIG. 5A, the end surface 61 of the lower end surface board 60 has an insertion port 62 into which the trunk cable 3 is inserted and an insertion port 63, 63, 63 into which the indoor cable 4 is inserted. , 63 are provided. On the other hand, as shown in the rear view of FIG. 5 (c), the end face 64 inserted into the branch body 51 of the lower end face board 60 has an outlet 65 of the trunk cable 3 and outlets 66, 66, 66, 66, 67, 67 for locking the tension member 32 branched from the end of the trunk cable 3, and cable fixing clips 68, 68, 68, 68 are provided.

  Further, as shown in the rear view of FIG. 6A, outlets 72, 72, 72, 72 of the indoor cable 4 and cable fixing clips are provided on the end surface 71 to be inserted into the branch body 51 of the upper end face board 70. 73, 73, 73, 73 are provided. On the other hand, as shown in the front view of FIG. 6 (c), the end face 74 of the upper end face board 70 is provided with insertion openings 75, 75, 75, 75 through which the indoor cable 4 is inserted into the branch part body 51. Yes.

  In this way, the trunk cable 3 and the indoor cable 4 are respectively inserted from the respective insertion openings provided in the lower end face board 60 and the upper end face board 70 and are connected by using the fusion sleeve 54. It fixes to the fusion sleeve fixing | fixed part 53 of this. Connection and fixing of the optical fiber 36 branched from one terminal of the trunk cable 3 and the optical fiber 44 of the indoor cable 4 are performed in the following procedure.

  First, one trunk cable 3 and 16 indoor cables 4 are passed through the insertion openings provided in the lower end face board 60 and the upper end face board 70 and fixed. Specifically, one main cable 3 is inserted into the insertion port 62 of the lower end surface board 60, and the sixteen indoor cables 4 are arranged in pairs at four insertion ports 63, 63, A total of eight are inserted into 63 and 63. The remaining eight indoor cables 4 are inserted into four insertion ports 75, 75, 75, 75 of the upper end face board 70 as a set of two.

  Next, the lower end face board 60 and the upper end face board 70 into which these cables are inserted are fitted into the branch portion main body 51. The 32-core optical fiber core wire 31 of the trunk cable 3 inserted from the insertion port 62 is connected to the 4-core optical fiber core wire 35 (a total of four optical fibers 36 in the split-type 8-core optical fiber core wire 34) from the terminal. ), And the divided four-core optical fiber core 35 is divided into two of the two-core optical fiber core wires 41 of the indoor cable 4 inserted from the insertion port 75 by a fusion machine (not shown) (total 4 The optical fibers 44) are fused and connected. In this case, the extra length of the four-core optical fiber core wire 35 and the two-core optical fiber core wire 41 has a bending diameter of 30 mm or less using the turn guide portion 52 in order to prevent the optical fiber 36 or the optical fiber 44 from being broken. It is devised not to become.

  Then, the fusion-bonded optical fiber is inserted into the fusion sleeve 54. The fusion sleeve 54 is inserted into the fusion sleeve fixing portion 53 of the branch portion main body 51 and fixed. Here, the connection between the optical fiber 36 separated from the terminal of the trunk cable 3 and the optical fiber 54 of the indoor cable 4 is fusion-bonded, because this connection is made in the factory in advance by the fusion machine. This is because the connection cost can be reduced and the dimensions of the branch portion 5 can be reduced as compared with the connection.

Finally, the lid (not shown) is put on the branch body 51. Then, a fixing screw is inserted into the screw fixing portion 55 of the branching portion main body 51 through the lid, and the screw (not shown) is fixed to the branching portion main body 51 by tightening this screw. An optical branch cable composed of a trunk cable adjusted to the required length, an indoor cable adjusted to the required length, and a branching portion to which the terminal of the trunk cable is connected is manufactured in the factory in advance. Therefore, no new wiring work such as cable cutting / branching or connection is required at the wiring construction site, so the wiring work at the wiring construction site can be reduced and the wiring cost can be reduced.

  Next, a wiring method using the optical branch cable according to the present embodiment will be described.

  In the apartment 20 shown in FIG. 1A, three optical branch cables 10 (10a, 10b, 10c) are wired. These optical branch cables 10a, 10b, and 10c are pre-manufactured in the factory and transported to the apartment 20 and then wired. A method of wiring the optical branch cable 10 will be described mainly using the optical branch cable 10a illustrated in FIG.

  In the wiring of the optical branch cable 10, first, the first optical branch cable 10 a is connected to the power supply panel 1 and pulled up. The branch portion 5a of the optical branch cable 10a is fixed at the position of the sixth floor, and from here the indoor cable 4a of the branch cable is wired to each of the fifth and sixth floor doors. The trunk cable 3a of the optical branch cable 10a has one terminal connected to the power panel 1 and the other terminal connected to the branch section 5a on the sixth floor. Moreover, as for the indoor cable 4a, one terminal is connected to the branch part 5a of the 6th floor, and the other terminal is connected to the information distribution board 2 of each house on the 5th and 6th floors. Here, the trunk cable 3a of the optical branch cable 10a and the indoor cable 4a of the branch cable are adjusted to the length of the required strip length in advance in the factory as described above. Therefore, when the branch portion 5a of the optical branch cable 10a is wired and fixed at a predetermined arrangement position in the wiring site of the apartment 20, the cable is cut and connected to the main cable 3a and the indoor cable 4a. No new wiring work will be added.

  The optical branch cable 10a is fixed only by the branch portion 5a without using a tension support wire. However, the cable is fixed to a ladder rack (not shown) in the main shaft with an insulation lock (not shown). A method may be adopted. The optical branch cable 10a may be fixed by an intermediate pulling jig using a wire net (not shown) when there is no rack.

  Next, the second optical branch cable 10b is wired in the same manner as the first optical branch cable 10a. That is, the second optical branch cable 10b is connected to the power supply panel 1, and is pulled upward from here, and the branching portion 5b of the optical branch cable 10b is fixed at a predetermined position on the fourth floor. 4b is wired to each of the third and fourth floor doors.

  Finally, the third optical branch cable 10c is wired in the same manner as the first optical branch cable 10a. That is, the third optical branch cable 10c is connected to the power supply panel 1 and pulled up from here, the branching portion 5c of the optical branch cable 10c is fixed at a predetermined position on the second floor, and from here the indoor cable 4c of the branch cable is connected. It is wired to the first and second floor doors.

  In addition, the order in which the optical branch cable 10 is wired inside the building is not limited to the present embodiment, and if the wiring work can be conveniently performed for a building such as a laid building or an apartment, The order of wiring may be changed.

  As described above, in the wiring work site of the wiring cable in a building such as an apartment, for example, the conventional optical communication trunk cable 110 shown in FIG. On the other hand, the wiring method using the optical branch cable of the present invention does not require a new optical fiber cable cutting work or connection work, thus reducing the wiring work at the wiring work site and reducing the wiring cost. can do.

It is the figure which showed one Example of the building which arrange | positioned the optical branch cable which concerns on this invention, (a) is the figure which showed typically the wiring method of the optical branch cable in an apartment, (b) is light It is the figure which showed the structure of the branch cable typically. It is sectional drawing which shows the structure of the trunk cable of the optical branch cable which concerns on this invention. It is sectional drawing which shows the structure of the indoor cable of the optical branch cable which concerns on this invention. It is explanatory drawing which showed the connection of the trunk cable and the indoor cable in the branch part of the optical branch cable which concerns on this invention. It is the figure which showed the lower end face board of the branch part of the optical branch cable which concerns on this invention, (a) is a front view, (b) is a side view, (c) is a rear view. It is the figure which showed the upper end face board of the branch part of the optical branch cable which concerns on this invention, (a) is a rear view, (b) is a side view, (c) is a front view. It is the conceptual diagram which showed typically the wiring method of the conventional optical fiber cable. It is explanatory drawing of the conventional optical communication trunk line cable. It is explanatory drawing of the conventional optical communication trunk line cable main body. It is the whole explanatory drawing of the wiring process of the conventional FO cable. It is principal part detailed explanatory drawing of the wiring process of the conventional FO cable.

Explanation of symbols

1 ......... Power supply panel 2 ......... Information distribution board 3 ......... Main cable 4 ......... Indoor cable 5 ......... Branch 10 ... Optical branch cable 20 ... Apartment 51 ... Branch body 52 ... ... Turn guide part 53 ... Fusion sleeve fixing part 60 ... Branch part lower end face board 70 ... Branch part upper end face board

Claims (2)

One main line cable, a large number of indoor cables with respect to the main line cable, and one branch part;
The indoor cable is wired one by one to each door to be wired in the building, and the indoor cable is scheduled to be provided with the length of the branching portion in the building. location and is intended to be adjusted at the factory to a length corresponding to the distance between the information distribution board provided in each household in the building,
The trunk cable is an indoor type multi-core cable, and the trunk cable is provided in the building and the location where the branch is to be provided in the building. Is adjusted at the factory to a length corresponding to the distance to the power panel,
The branch part is connected to a terminal of the trunk cable, and one branch part is an optical fiber branched from one terminal of the trunk cable and a number of optical fibers of the indoor cable. all SANYO to protect the connection portion connected to the door,
A building provided with an optical branch cable, wherein a plurality of optical branch cables manufactured in advance in the factory are provided . In the building which arranged the optical branch cable according to claim 1,
The structure in which the optical branch cable is disposed , wherein the connection between the optical fiber branched from the end of the trunk cable in the branch portion and the optical fiber of the indoor cable is a fusion splicing.

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