JPH0228483Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Background and Purpose of the Invention] The present invention relates to an improvement of a junction box for optical fiber composite overhead ground wires such as intermediate and terminal wires.

Conventionally, an optical fiber composite overhead ground wire junction box has been formed from a plate into a rectangular or rectangular parallelepiped shape and mounted on a steel tower. The optical fibers that have been connected in the junction box can accommodate the extra length at the time of connection or the extra length in case of future reconnection without causing large bending strain to the optical fibers. There must be. In order to avoid this bending strain, optical fibers are generally housed in a loop.
(referred to as ) requires a certain level of size for one plane. Since the optical fiber is formed in a loop shape and accommodated, extra space is created at the four corners of a square plane. The area of the wind receiving area is larger due to this space, and the wind pressure load applied to the tower is also larger.

Furthermore, in the conventional connection box consisting of a connection box and a lid, the connection box and the lid are fixed with a large number of bolts and nuts, making it troublesome to attach and remove the lid.

The present invention was developed in view of the above situation, and is an optical fiber composite overhead ground wire junction box that has low wind pressure resistance when installed on a steel tower, is efficient in storing optical fibers, and is easy to attach and detach the lid. It is intended to provide.

[Summary of the invention] The OPGW junction box of this invention connects multiple OPGWs.
is inserted inside, and the above is inserted inside the inside.
A band is wrapped around the side surface of the boundary between the disc-shaped connection box where the optical fiber connection part of the OPGW is formed and the disc-shaped lid that covers the upper opening, and both ends of the band apply tension to the band. They are connected by a fastener that can hold them in place.
The disc-shaped lid is fixed to the disc-shaped connection box by the band. Therefore, the extra length portion is formed in a circular shape inside, which improves the storage efficiency of the optical fiber and reduces the area exposed to wind.

[Example] An example of the OPGW junction box of the present invention will be described below with reference to FIGS. 1 and 2. Figure 1 is a plan view;
FIG. 2 is a front view. In the figure, 1 is
OPGW main body, 2 is an optical fiber, 3 is an optical fiber connection part, 4 is a disc-shaped lid body that is placed over the upper opening of the connection box 8 formed in a disc shape, and 5 is a disc-shaped lid body.
The insertion opening of the OPGW main body, 6 is a band such as a V-band coupling or T-bolt clamp, and 7 is a fastener such as a T-bolt.

Since the disc-shaped connection box 8 is formed into a flat disc shape, the optical fiber 2 after connection is
When a large number of 20cm loops of several turns are stored in the disc-shaped connection box 8, the interior space can be used without waste because it is circular rather than square, resulting in more efficient storage. Furthermore, the loop can be easily formed with a uniform curvature.

Since the four corners are removed and the area is smaller, the volume is smaller and the resistance to the wind on the tower is reduced.

Additionally, OPGW junction boxes are generally considered to have a waterproof structure.
A rectangular box cannot be sealed against rainwater unless the lid is attached using multiple bolts and nuts.
However, in this embodiment, since the connection box 8 is in the shape of a disc, when the lid 4 is attached to and removed from the connection box 8, the connection box 8 and the disc-shaped case are connected to each other via the fastener 7. A band 6 wrapped around the side surface of the boundary with the body 4 allows for one-touch operation for attachment and detachment. Furthermore, it is possible to completely seal against rainwater. In addition, the OPGW main body 1 is connected to the box 8.
When inserting into the bottom of the interior, it is desirable to attach the insertion opening 5 so that the insertion can be made obliquely to the bottom.

In this way, in the OPGW junction box of this example, the connection box is formed in a disc shape without the four corners of the conventional box shape, and the extra length is formed in a loop shape, making it easy to store. Efficiency can be improved, and since there are no four corners, the shape is smaller, which saves on materials. At the same time, the area affected by the wind can be reduced, and the wind pressure load on the tower can be reduced. Further, since the connecting box and the lid are disk-shaped, the mounting structure of the disk-shaped lid is simple, and the operation of attaching and detaching the disk-shaped lid is extremely easy, which improves the ease of handling. Furthermore, it is possible to sufficiently seal against rainwater.

[Effects of the invention] As described above, the OPGW junction box of the invention has the following effects:
When mounted on a steel tower, there is less wind pressure resistance, the optical fibers are stored more efficiently, and the lid can be easily attached and detached.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the optical fiber composite overhead ground wire junction box of the present invention, and FIG. 2 is a front view of FIG. 1. 1: Optical fiber composite overhead ground wire (OPGW) main body,
2: Optical fiber, 3: Optical fiber connection part, 4: Disc-shaped lid, 6: Band, 7: Fastener, 8: Disc-shaped connection box.

Claims (1)

[Scope of utility model registration request] A disc-shaped connection box into which a plurality of optical fiber overhead ground wires are inserted and in which an optical fiber connection portion of the optical fiber overhead ground wire is formed; and an upper part of the disc-shaped connection box. and a disc-shaped lid that is placed over the opening, wherein a band is wound around a side surface of the boundary between the disc-shaped connection box and the disc-shaped lid, and both ends of the band are attached to the band. The optical fiber composite aerial is connected by a fastener that can be held in a tensioned state, and the disc-shaped lid body is fixed to the disc-shaped connection box by the band. Connection box for ground wire.