JPH07212952A - Optical fiber cable joint of power/optical fiber composite cable - Google Patents

Abstract

PURPOSE:To suppress the increase of the outer diameter of an optical fiber cable joint by a method wherein the shape and position of a sleeve in which the excessive length of the optical fiber cable for re-jointing is stored are deviced. CONSTITUTION:A sleeve 3 in which the excessive length of an optical fiber cable 2 for re-jointing is stored is oval cylinder shaped and brought into contact with the outer circumferences of adjacent two power cables 1 in a valley part formed by the two power cables 1. The re-jointing excessive length storing sleeve 3 is composed of two sections divided along the long diameter side of the oval. It is recommended to form an optical fiber storing groove along the assembly surfaces of the divided sections. Further, it is recommended to make the storing groove have various types of waving grooves so as to select the waving groove which matches the length of the optical fiber cable shortened by re-jointing to store the optical fiber cable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable connecting portion in a power / optical fiber composite cable.
In particular, it relates to a technology for accommodating an extra length for reconnection of an optical fiber cable.

[0002]

2. Description of the Related Art In a connection portion of a power / optical fiber composite cable, a reconnection surplus length accommodating sleeve has been used to handle a surplus length in the reconnection portion of the optical fiber cable.

FIG. 4 shows an optical fiber connecting portion of a conventional power / optical fiber composite cable. According to this, a cylindrical reconnection extra length accommodating sleeve 3'is used. That is, the extra length accommodation sleeve 3'for reconnection.
Has the same cross-sectional area as the power cable 1'and is arranged along a plurality of power cables. Reference numeral 2'denotes an optical fiber cable, and the extra length portion is accommodated in the extra length accommodation sleeve 3'for reconnection.

[0004]

In the optical fiber cable connecting portion of the conventional power / optical fiber composite cable, the extra length accommodating sleeve for reconnecting the optical fiber cable is cylindrical and has a size comparable to that of the power cable. To become
When the power cable core has a small size, the reconnection extra length accommodating sleeve has a relatively large size, and the finished outer diameter of the composite cable due to consideration of the reconnection extra loop space. Had to be noticeably larger.

With the above-mentioned problems, the problem of increasing the weight and inevitably increasing the manufacturing, transportation, and installation costs has been spread.

The present invention solves the above-mentioned problems of the prior art and improves the prevention of increase in the outer diameter of the optical fiber cable connecting portion by devising the shape and arrangement of the excess length accommodating sleeve for reconnecting the optical fiber cable. It is intended to provide an optical fiber cable connecting portion of a power / optical fiber composite cable capable of achieving the above. Therefore, that point is an object of the present invention.

[0007]

An optical fiber cable connecting portion of a power / optical fiber composite cable provided by the present invention has a valley between adjacent power cables in which an extra length accommodating sleeve for reconnection of the optical fiber cable is an elliptic cylinder. It is characterized by being circumscribed on the part.

The extra length accommodating sleeve for reconnection is composed of a combination of two split pieces divided along the long side of the ellipse, and an optical fiber cable accommodating groove is preferably formed on the combination surface. Further, the optical fiber cable accommodation groove provided in the reconnection excess length accommodation sleeve,
It is preferable that the optical fiber cable has a plurality of types of wavy grooves having different amplitudes, and the wavy grooves can be selected according to the optical fiber cable whose extra length has been shortened by reconnection to accommodate the optical fiber cable.

[0009]

According to the optical fiber cable connecting portion of the power / optical fiber composite cable of the present invention, when the elliptic cylinder-shaped extra-connecting length accommodating sleeve is circumscribed in the valley portion between adjacent power cables, the extra connecting portion is provided. The outer surface can be formed by an elliptical plane of the long accommodating sleeve, and the extra length accommodating sleeve for reconnection can be accommodated within the circumscribed envelope of a plurality of power cables.

[0010]

FIG. 1 shows a preferred embodiment of an optical fiber cable connecting portion of a power / optical fiber composite cable according to the present invention. FIGS. A preferred example of the sleeve is shown.

In this embodiment, as shown in FIG. 1, three power cables 1 are twisted together to form a triplex type, and the optical fiber cable 2 is arranged so that the optical fiber cable 2 extends along the valley between two adjacent power cables. Further, a reconnection extra length accommodating sleeve 3 is provided at a position where the optical fiber cable 2 passes, and the reconnection extra length accommodating sleeve 3 is circumscribed in a valley portion between adjacent power cables. is there.

However, the extra length accommodation sleeve 3 for reconnection is used.
As shown in FIG. 2, is an elliptic cylinder, and is composed of a combination of two pieces 31 and 32 divided along the long side of the ellipse, and an optical fiber cable accommodating groove is formed on the combined surface. . Reference numeral 33 is a groove hole which becomes an end opening of the optical fiber cable accommodation groove.

As shown in FIG. 3, the optical fiber cable accommodating groove of the excess length accommodating sleeve 3 for reconnection is made into several kinds of wave-shaped grooves 34 and 35 having different amplitudes, and is shortened by reconnecting the optical fiber cable. The groove is selected according to the length, and the optical fiber cable 3 is accommodated so as to absorb the excess length.

The reconnecting extra length accommodating sleeve 3 shaped as described above has an optimal wavy groove 34 that matches the extra length of the reconnected optical fiber cable 2 as shown in FIG. After accommodating in this, and combining them as shown in FIG. 2 to form an elliptic cylinder, as shown in FIG. 1, one of the elliptical flat surfaces is circumscribed in the valley portion between the adjacent power cables 1. Be attached to. Then, the other oblong flat surface can form the outer surface, and thus the reconnection excess length accommodation sleeve 3 can be accommodated in the outer envelope 4 of the plurality of power cables. .

[0015]

According to the optical fiber cable connecting portion of the electric power / optical fiber composite cable of the present invention as described above, the extra length accommodation for reconnection for accommodating the extra length portion for reconnection of the optical fiber cable is accommodated. Since the sleeve is in the form of an elliptic cylinder and is circumscribed in the valleys between the adjacent power cables, it is possible to suppress an increase in the outer diameter of the connection portion.
As a result, the outer diameter and weight of the finished cable as a power / optical fiber composite cable are reduced, and the following effects can be expected. Reduction of cable manufacturing material cost, reduction of processing cost due to expansion of manufacturing lot length, reduction of transportation cost due to reduction of product packaging, improvement of ease of installation and reduction of installation cost due to reduction of cable outer diameter and weight. Reduction.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an embodiment of an optical fiber cable connecting portion of a power / optical fiber composite cable according to the present invention.

FIG. 2 is a cross-sectional explanatory view showing a specific example of the excess-length accommodating sleeve for reconnecting the optical fiber cable in the embodiment of the present invention.

FIG. 3 is a side view showing a specific example of a surplus length accommodating sleeve for reconnecting an optical fiber cable according to an embodiment of the present invention.

FIG. 4 is a cross-sectional explanatory view showing an embodiment of an optical fiber cable connecting portion of a conventional power / optical fiber composite cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power cable 2 Optical fiber cable 3 Extra length accommodation sleeve for reconnection 31, 32 Divided piece 33 Groove hole in optical fiber cable accommodation groove 34, 35 Wavy groove in optical fiber cable accommodation groove

Claims (3)

[Claims] 1. In an optical fiber cable connecting portion of a power / optical fiber composite cable in which a power cable and an optical fiber cable are combined, adjacent reconnecting extra length accommodating sleeves of the optical fiber cable are formed in an elliptic cylinder shape. An optical fiber cable connecting part of a power / optical fiber composite cable characterized in that it is circumscribed in the mutual valleys. 2. The reconnection extra length accommodating sleeve is composed of a combination of two split pieces divided along the long side of the ellipse, and an optical fiber cable accommodating groove is formed on the combination surface. The optical fiber cable connection part of the power / optical fiber composite cable described in 1. 3. An optical fiber cable accommodation groove provided in the reconnection excess length accommodation sleeve is provided with several kinds of wavy grooves having different amplitudes, and is adapted to an optical fiber cable whose extra length is shortened by reconnection. The optical fiber cable connecting portion of the power / optical fiber composite cable according to claim 1 or 2, wherein the wavy groove is selected to accommodate the optical fiber cable.