JPH0687088B2 - Optical fiber composite cabtyre cable optical fiber repair method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for repairing connection of an optical fiber in a cabtire cable using the optical fiber.

[Conventional technology and its problems]

The high-capacity transmission characteristics of the optical fiber have been improved, and by combining several thin fibers in the power line core, it has become possible to make advanced teleconverters and monitoring systems. Especially, in the optical fiber composite cabtire cable system, it is possible to transmit not only the meter transmission and operation but also the ITV moving image transmission with a single cable that is combined with the power line core. Since the optical fiber composite cabtyre cable is used with moving equipment in factories, etc., it needs to have a strong and elastic structure.The sheath has a twisting gap after twisting the insulated wire cores. Fully filled with the same protective material as the sheath. As a specific structure, as shown in FIG. 2 as an example, three power line conductors (2) covered with a power line insulator (3) and one optical fiber block (4) are chloroprene sheaths. It is embedded in (1). The optical fiber block (4) is centered on the FRP
There is a tension member (5), and six optical fiber core wires (8) with an FRP sheath are arranged around the tension member (5), which are covered by an inner chloroprene sheath (6), and the outside is reinforced by a reinforcing braid (7). It was done.

In the optical composite cabtyre cable with the above structure,
When a failure occurs and repair is required, it is impossible to perform a rubber-filled repair because the heat and pressure of vulcanization deteriorate the optical fiber characteristics.

Therefore, in the event of a failure, a new cable must be replaced, which is expensive, and there is the problem that no first aid can be provided.

The present invention has been made in consideration of the above points,
An object of the invention is to provide a method for repairing a failure such as a disconnection of an optical fiber in an optical composite cabtire cable during installation and use.

[Means for solving problems]

That is, the method of the present invention is a method for repairing an optical fiber in an optical fiber composite cap tire cable in which a power line and an optical block composed of an optical fiber and a tension member are integrated by a cable sheath. The cable sheath on the section is peeled in the longitudinal direction, (b) Next, the repair section optical block is cut, and (c) Next, one end of the bending-resistant optical fiber for cutting is attached to the optical fiber in the optical block. (D) Next, cover the fusion splicing part with a reinforcing sleeve that uses FRP as a tension member. (E) Next, attach the other end of the bending-resistant optical fiber for cutting into the optical fiber inside the optical block. An optical block repaired by fusion splicing to the fiber and covering with a reinforcing sleeve is provided. (F) Next, the repaired optical block is covered with a nylon spiral tube. Fill with curable compound,
In addition, the peeled cable sheath is bonded to the original position.

In the repair method described above, the bending resistant optical fiber for splitting can be made to have a sufficient length and twisted, and since FRP is used for the tension member of the reinforcing sleeve, it can be applied to the optical block of the repair section. Flexibility can be provided. Furthermore, since the light block is covered with the nylon spiral tube, a space is created around the light block, and it is possible to avoid applying pressure such as lateral pressure to the repaired portion. Further, by using the rubber cold-curing compound as an adhesive and a filler, heat and pressure during rubber vulcanization can be avoided.

〔Example〕

 The present invention will be described below based on the embodiments shown in the drawings.

FIG. 1 is a cross-sectional view of an optical fiber composite cabtire cable repaired by the method of one embodiment of the present invention. In the repair method, first, the chloroprene sheath (1 ') on the abnormal portion of the optical fiber block (4) is stripped in the longitudinal direction, and the abnormal portion is removed by removing the tension member (5). Next, the bending-resistant nylon-sheathed optical fiber core wire (8 ') for cutting is fused and connected to the original FRP-coated optical fiber core wire. Reinforcing sleeves having FRP as a tension member are covered on the two fusion splicing portions at both ends of the optical fiber core wire (8 '). The optical fiber core wire (8 ') with a nylon outer sheath for slitting has a sufficient length and is loosely wound around the central tension member (5). Next, the spiral tube (10) is wound around the repaired portion, and the holding tape (9) is wound on the wound portion to fix the spiral tube. In this state, the optical fiber core wire (8 ') in the spiral tube (10) is protected in a free state. The optical fiber block (4) restored in this way is fixed by the rubber adhesive (11), and after further filling with the rubber adhesive (11), the chloroprene sheath (1 ') that has been peeled off first is covered from above. .

As a result of conducting a continuous bending test on the cable repaired as described above, no structural abnormality occurred under the condition of a bending radius of 100 mm and a bending number of 3,000 times, and the optical transmission loss was also compared before the test. And did not increase.

〔The invention's effect〕

As described above, according to the present invention, a bending-resistant optical fiber is used for cutting, a means for protecting the optical block from external force is provided, and the cable sheath is bonded with a rubber cold-curing compound. In the above, there is an excellent effect that the emergency repair can be performed easily and at low cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of an optical fiber composite cabtire cable repaired by the present invention, and FIG. 2 is a cross-sectional view of a conventional example of the optical fiber composite cabtire cable. 1,1 '... Chloroprene sheath, 2 ... Power line conductor, 3
...... Power line insulator, 4 …… Optical fiber block, 5 ……
Tension member, 6 ... Internal chloroprene sheath, 7
…… Reinforcing braid, 8,8 …… Optical fiber core wire, 9 …… Pressing tape, 10 …… Spiral tube, 11 …… Rubber adhesive.

Claims (1)

[Claims] 1. A repair method for an optical fiber in an optical fiber composite cabtire cable, wherein a power line and an optical block composed of the optical fiber and a tension member are integrated by a cable sheath. The cable sheath on the repaired part is peeled in the longitudinal direction, (b) Next, the repaired part optical block is cut, and (c) Next, one end of the bending resistant optical fiber for cutting is attached to the optical fiber inside the optical block. (D) Next, cover the fusion splicing part with a reinforcing sleeve with FRP as a tension member. (E) Next, insert the other end of the bending-resistant optical fiber for cutting into the optical block. (F) Next, cover the repaired optical block with a nylon spiral tube, and (g) then cure at room temperature with rubber. Fill the mold compound,
A method for repairing an optical fiber in an optical fiber composite cabtyre cable, characterized in that the peeled cable sheath is adhered to the original position.