JP2004061540A - Optical fiber cable wiring method and optical fiber cable branch cover - Google Patents

Abstract

A branch connection of an optical fiber cable is performed even in a branch connection box having no space for accommodating a cable slot rod without causing damage or optical influence to an optical fiber core and preventing communication failure. To make things possible.
A cover 1 for branching an optical fiber cable includes a lower cover 2B and an upper cover attached to the lower cover 2B so as to cover the lower cover 2B. A cable cover portion 7A that covers the coating removal portion, a guide portion 7B that guides the optical fiber core branched from the optical fiber cable 3 to the branch connection box 4 side, and an extra length of the optical fiber core required for branch connection. For this purpose, there is provided a pair of cable gripping portions 6 for fixing when removing the cable coating at both ends of the portion where the cable coating has been removed without cutting the cable slot rod, and a branch cover fixing portion 9 fixed to the branch connection box. .
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for wiring an optical fiber cable used for optical wiring in a building premises in the field of information communication and a cover for branching the optical fiber cable.
[0002]
[Prior art]
Conventionally, when branching an optical fiber core at an arbitrary longitudinal middle part of an optical fiber cable in optical wiring in a building premises, the following two methods are used as a method for securing a necessary extra connection length of the optical fiber core. Can be mentioned.
In the first method, as shown in FIG. 3, in order to secure the extra length of the optical fiber core required for branch connection in the trunk cable (optical fiber cable) 3, the extra length of the optical fiber core required for branch connection is used. Only the portion (cable coating, cable slot rod) other than the optical fiber core in the optical fiber cable 3 is removed.
[0003]
Then, all the optical fiber cores in the portion of the optical fiber cable other than the optical fiber core are removed, and the optical fiber cables on both sides of the optical fiber cable in which the portions other than the optical fiber core are not removed. The inside is fixed in the branch connection box 4 by the cable gripper 6. Then, the optical fiber core 10 to be branched and connected is selected from the extracted optical fiber core wires, and this is connected to the other optical fiber core 13 on the branch side and the extra connection portion provided in the branch connection box 4. The connection is made by the optical fiber connection portion 12 in the housing portion 11, and the extra connection portion of the optical fiber core and the extra connection portion of all the optical fiber cores at the portion where the coating and the slot rod of the optical fiber cable are removed are branched. They are stored in the extra connection length storage sections 11 and 14 provided in the connection box 4, respectively.
[0004]
In the second method, as shown in FIG. 4, the optical fiber cable (trunk cable) 3 having a cable slot rod 8 having a groove for accommodating the optical fiber core is branched at a position where the optical fiber cable 3 branches. The sheath is removed by a required length, and the optical fiber cable 3 is grasped by the cable grasping tool 6 from above the sheath when the sheath of one optical fiber cable 3 to be branched and connected in the branch connection box 4 is removed. Fix it.
[0005]
The portion of the optical fiber cable coating removed from the outside of the box of the branch connection box 4 is protected from external force by covering it with a chimney-like protection member 16, and one end in the longitudinal direction of the chimney-like protection member 16 is connected to the branch connection box. 4 and the optical fiber core 10 to be branched and connected with the optical fiber core housed in the cable slot rod 8 is selected, and this is connected to the other optical fiber core 13 on the branch side and the branch connection box 4. The connection is made by the optical fiber connecting portion 12 in the extra connection length storage portion 11 provided therein, and the extra connection length of the optical fiber is stored in the extra connection length storage portion 11.
[0006]
[Problems to be solved by the invention]
In the first method described above, in the case of an optical fiber cable having a slot rod, it is necessary to take out all the optical fiber cores housed in the slot rod in order to cut the slot rod. If there is an optical fiber core that has already been provided with a communication signal and service is provided, it is not possible to sufficiently protect the extracted optical fiber core part. There was a possibility that a bending radius would occur because the radius of curvature could not be secured, and a communication failure due to attenuation of an optical signal would occur.
[0007]
Further, the second method has a problem that a space for passing the slot rod of the optical fiber cable is required in the branch connection box, and there is a problem that the method cannot be applied to a branch connection box in which the space cannot be secured.
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made without causing any damage or optical influence to an optical fiber cable through which a communication signal is propagated, which may cause a communication failure, and with an optical fiber cable. It is an object of the present invention to provide an optical fiber cable wiring method and an optical fiber cable branch cover that can perform branch connection of an optical fiber cable even in a branch connection box having no space for accommodating the cable slot rod. .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 has a cable slot rod having a groove for accommodating an optical fiber core and a cable coating covering the same when constructing an optical fiber wiring facility in a building premises. An optical fiber cable wiring method for branching an optical fiber cable and connecting the optical fiber cable to another branching optical fiber cable, wherein the cover covers the removed portion of the optical fiber cable and the branched portion of the optical fiber core so as not to be exposed to the outside. An optical fiber cable branch cover consisting of an upper part and a cover lower part is attached to the inside of a building, and is attached to a branch junction box for accommodating a connection portion between the optical fiber core of the optical fiber cable and the optical fiber core of the branch optical fiber cable. Fix the optical fiber cable core required for branch connection at any longitudinally intermediate portion of the optical fiber cable. The cable coating is removed without cutting the cable slot rod in order to secure the optical fiber cable. The optical fiber core is fixed to a cable holding portion attached to the upper or lower cover of the cable branching cover, and an optical fiber core of a portion of the fixed optical fiber cable from which the cable coating is removed is taken out to obtain the optical fiber core. The optical fiber cable of the optical fiber cable for branching is connected to the optical fiber cable of the optical fiber cable for branching in the branch connection box, and the upper part of the cover for optical fiber cable branching is attached to the lower part of the cover.
[0009]
According to a second aspect of the present invention, when constructing an optical fiber wiring facility in a building, a cable slot rod having a groove for accommodating an optical fiber core and an optical fiber cable having a cable coating covering the same are branched. When connecting to another branch optical fiber cable, the branch connection box is installed in the building premises and accommodates a connection portion between the optical fiber core of the optical fiber cable and the optical fiber core of the branch optical fiber cable. An optical fiber cable branch cover to be fixed and used, wherein the optical fiber cable branch cover has a cover lower portion that covers a coating removal portion of the optical fiber cable and a branch portion of the optical fiber core so as not to be exposed to the outside. And a cover upper mounted on the lower part of the cover so as to cover the lower part of the cover. A cable cover portion that covers the sheath removing portion of the fiber cable, a guide portion that guides the optical fiber core branching from the optical fiber cable to the branch connection box side, and at an arbitrary longitudinal intermediate portion of the optical fiber cable, Formed at both ends of the cable cover portion for fixing the cable coating removal at both ends of the portion where the cable coating is removed without cutting the cable slot rod in order to secure the extra length of the optical fiber core required for branch connection. And a branch cover fixing part fixed to the branch connection box.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show the structure of an optical fiber cable branch cover according to an embodiment of the present invention. FIG. 1 is an external view showing a state where an optical fiber cable branch cover is fixed to a branch connection box, and FIG. 2 shows an internal structure thereof.
[0011]
The optical fiber cable branch cover 1 according to the present embodiment branches an arbitrary optical fiber core from a laid optical fiber cable when it becomes necessary to wire an optical fiber core on an arbitrary floor in a building. In this case, it is used in combination with a junction box. That is, as shown in FIG. 1, when constructing an optical fiber wiring facility in a building premises, an optical fiber cable (trunk cable) having a cable slot rod having a groove for accommodating an optical fiber core and a cable coating covering the same. When the optical fiber cable 3 is branched and connected to another optical fiber cable 5 for branching, the connecting portion between the optical fiber core of the optical fiber cable 3 and the optical fiber core of the optical fiber cable 5 for branching is installed in the building premises. It is used by being fixed to the branch junction box 4 to be accommodated.
[0012]
The cover 1 for branching the optical fiber cable includes a cover lower portion 2B that covers the coating removal portion of the optical fiber cable 3 and the branch portion of the optical fiber core so as not to be exposed to the outside, and a cover lower portion 2B that covers the cover lower portion 2B. And a cover upper part 2A to be attached.
[0013]
Further, the cover lower portion 2B has a cover base plate 7, which covers the coating removal portion of the optical fiber cable 3 and externally removes the optical fiber core of the portion where the coating of the optical fiber cable is removed. A cable cover portion 7A for protecting from damage, a guide portion 7B for guiding the optical fiber core wire 10 branched from the optical fiber cable 3 to the branch connection box 4 side, and a branch at an arbitrary longitudinal intermediate portion of the optical fiber cable 3. In order to secure the extra length of the optical fiber core required for the connection, the cable cover is formed at both ends of the cable cover portion 7A for fixing the ends of the cable cover at both ends of the portion where the cable cover is removed without cutting the cable slot rod. It is provided at an end of a pair of cable gripping portions 6 and a guide portion 7B fixed to a branch connection box (a branch connection box for termination or a branch connection box for wiring) 4. And a Toki cover fixing unit 9.
[0014]
Note that the pair of cable gripping portions 6 and the branch cover fixing portion 9 may be provided on the upper cover 2A. The cable cover 7A and the guide 7B are provided on both the cover upper portion 2A and the cover upper portion 2B.
The optical fiber cable 3 used in the present embodiment has a plurality of optical fiber cores which are covered with an outer layer and housed in grooves of a resin slot rod. The cable gripper 6 can grip and fix the optical fiber cable 3 from above the coating of the optical fiber cable 3 by tightening a metal gripper with a screw.
[0015]
The cover upper portion 2A and the cover lower portion 2B have a space capable of accommodating the optical fiber cable 3 having a length necessary for securing an extra length of the optical fiber core necessary for connection between the optical fiber cores, and a cable grip. There is a space for accommodating the section 6, and the optical fiber cable 3 and the cable gripping section 6 inside can be operated by removing the cover 2A by a detachable structure.
[0016]
The branch cover fixing portion 9 for fixing the optical fiber cable branch cover 1 to the branch connection box 4 has a sufficient strength, and a main body of the branch connection box 4 as a termination branch connection box or a wiring branch connection box with screws. Can be fixed to the frame part. The guide portion 7B for guiding the branched optical fiber core 10 to the branch connection box 4 side is used to connect the optical fiber core wire 10 branched from the optical fiber cable 3 fixed to the cable holding portion 6 to a termination branch connection box or wiring. In the branch junction box 4 serving as a branch junction box, there is a space for wiring without giving light loss due to bending of the optical fiber core and a guide for preventing the optical fiber core from protruding outside. are doing.
[0017]
When the optical fiber cable branch cover 1 is used to construct an optical fiber wiring facility in a building premises, a cable slot rod having a groove for accommodating an optical fiber core and an optical fiber having a cable coating covering the same The specific contents of the wiring method of the optical fiber cable for branching the cable and connecting to another branching optical fiber cable will be described below.
[0018]
1 and 2, an optical fiber cable branch cover 1 comprising a cover upper portion 2A and a cover lower portion 2B for covering the removed portion of the optical fiber cable 3 and the branch portion of the optical fiber cable so as not to be exposed to the outside. A branch connection box 4 attached to the premises and having a branch core connection extra length storage portion 11 for storing a connection portion between the optical fiber core 10 of the optical fiber cable 3 and the optical fiber core 13 of the branch optical fiber cable 5. Secure with screws.
[0019]
Next, at an arbitrary longitudinal intermediate portion of the optical fiber cable 3, the cable coating is removed without cutting the cable slot rod in order to secure the extra length of the optical fiber core required for branch connection, and the removed portion is removed. A lateral pressure is applied from above the cable coating portion at the time of removing the cable coating at both ends of the optical fiber cable, and the optical fiber cable 3 is attached to the cover lower portion 2B (or the cover upper portion 2A) of the optical fiber cable branching cover 1 by a pair of cable holding portions 6. Is fixed by tightening up the cable gripping tool with a pressing screw.
[0020]
At this time, even if the screws are tightened as shown in Japanese Patent Application No. 11-223453, a space larger than the diameter of the rod rod is secured between the cable gripper and the branch connection box main body. Does not apply more than a certain lateral pressure. Therefore, the cable coating is not broken and the inside optical fiber core is not affected.
Next, any necessary optical fiber core wire 10 is selected and taken out of the cable slot rod of the optical fiber cable 3. Since the groove of the cable slot rod in which the optical fiber core is accommodated draws an arc in the longitudinal direction of the cable, it is possible to take out the optical fiber 10 longer than the length of the stripped cable coating. is there. The taken-out optical fiber core 10 is cut while securing a length necessary for connection.
[0021]
In this way, the optical fiber cable 3 fixed to the optical fiber cable branch cover 1 is taken out of the optical fiber cable 3 at the portion where the cable coating is removed, and the cut optical fiber core wire is put into the branch connection box. For wiring, the optical fiber is guided to a branch junction box through an optical fiber core wire through a guide portion, and the optical fiber core wire 10 and the optical fiber core wire 13 of the branch optical fiber cable 5 are branched in the branch connection box 4. The connection is made at the optical fiber connection section 12 in the extra-cord length storage section 11. Finally, the upper cover 2A of the optical fiber cable branch cover 1 is attached to the lower cover 2B.
[0022]
The other optical fiber cores in the optical fiber cable 3 remain housed in the slot rod of the optical fiber cable, and since the external force does not directly reach the optical fiber core, the propagating light is not transmitted. Even if a signal is present, there is no light loss caused by bending of the optical fiber core at a level that affects communication.
[0023]
【The invention's effect】
As described above, according to the present invention, an optical fiber cable is not damaged or optically affected without causing a communication failure in another optical fiber cable in which a communication signal of an optical fiber cable in a building premises is propagated. Even in a branch connection box having no space for accommodating a cable rod rod, it is possible to branch, connect, and house an optical fiber core and wire it.
[0024]
In addition, according to the present invention, the optical fiber cable is branched / branched without causing damage or optical influence to other optical fiber cables in which communication signals of the optical fiber cable in the building premises propagate as communication failure. Even in the case of connecting and storing and wiring, the space for storing the rod rod of the optical fiber cable is not required inside the branch connection box, so that the volume of the branch connection box alone can be reduced. .
[Brief description of the drawings]
FIG. 1 is an external view showing a state in which an optical fiber cable branch cover according to an embodiment of the present invention is fixed to a branch connection box.
FIG. 2 is a configuration diagram showing the internal structure of the optical fiber cable branch cover according to the embodiment of the present invention shown in FIG. 1;
FIG. 3 is an explanatory view showing the structure of a conventional branch connection box for cutting a cable slot rod.
FIG. 4 is an explanatory view showing the structure of a conventional branch connection box without cutting a cable slot rod.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Optical fiber cable branch cover 2A ... Cover upper part 2B ... Cover lower part 3 ... Optical fiber cable (main cable)
4 Branch connection box 5 Branch optical fiber cable 6 Cable gripping part 7 Cover base plate 7A Cable cover part 7B Guide part 8 Cable slot rod 9 Branch fixing part

Claims (2)

When constructing an optical fiber distribution facility in a building premises, a cable slot rod having a groove for accommodating an optical fiber core wire and an optical fiber cable having a cable coating covering the same are branched and connected to another branch optical fiber cable. An optical fiber cable wiring method,
An optical fiber cable branch cover comprising an upper cover and a lower cover for covering a stripped portion of the optical fiber cable and a branch portion of the optical fiber core so as not to be exposed to the outside; Fixed to a branch connection box that accommodates the connection between the core fiber and the optical fiber core of the branch optical fiber cable,
In an arbitrary longitudinal middle portion of the optical fiber cable, a cable coating is removed without cutting the cable slot rod in order to secure an extra length of an optical fiber core required for branch connection, and both ends of the removed portion. Affixing the optical fiber cable by applying a side pressure from above the cable covering portion at the time of removing the cable covering to the cable gripping portion attached to the upper or lower cover of the optical fiber cable branch cover,
The optical fiber cable branch cover is used to take out any optical fiber core from the portion of the optical fiber cable from which the cable coating is removed, and connect the optical fiber core to the optical fiber core of the branch optical fiber cable. A method for wiring an optical fiber cable, wherein the optical fiber cable is connected in a box, and the upper part of the optical fiber cable branch cover is attached to the lower part of the cover. When constructing an optical fiber distribution facility in a building premises, a cable slot rod having a groove for accommodating an optical fiber core wire and an optical fiber cable having a cable coating covering the same are branched and connected to another branch optical fiber cable. At the time, the optical fiber cable for branching is used by being fixed to a branch connection box which is attached to the building premises and accommodates a connection portion between the optical fiber core of the optical fiber cable and the optical fiber core of the branching optical fiber cable. The cover,
The optical fiber cable branching cover includes a cover lower portion that covers the coating removal portion of the optical fiber cable and the branch portion of the optical fiber core so as not to be exposed to the outside, and a cover that is attached to the lower portion of the cover so as to cover the cover lower portion. Consisting of the upper part,
The lower cover or the upper cover,
A cable cover portion that covers the stripped portion of the optical fiber cable,
A guide portion for guiding an optical fiber core branching from the optical fiber cable to the branch connection box side,
In any longitudinal middle part of the optical fiber cable, the cable coating is removed at both ends of the portion where the cable coating is removed without cutting the cable slot rod in order to secure the extra length of the optical fiber core required for branch connection. A pair of cable gripping portions formed at both ends of the cable cover portion for fixing the edge,
A branch cover fixing portion fixed to the branch connection box,
A cover for branching an optical fiber cable, comprising:

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