JPS5833911A - Method of connecting polyethylene cable coating - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to a method for connecting a polyethylene sheathed cable for running communications that is laid underground and is connected in a manhole or the like.In recent years, outdoor communications cables have become insulated. Polyethylene sheathed cables are widely used instead of lead sheathed cables because they are superior, lightweight, and inexpensive.These polyethylene sheathed cables are laid underground and connected inside manholes to form underground cable lines. Teru.

On the other hand, with the adoption of the PCMaf system, it is necessary to extract a desired core wire at the cable connection point and install a repeater.

Conventional 6IE connection methods for polyethylene-sheathed cables include the heat-shrinking cheap method, compound injection method, and epoxy putty method, but all of them are methods of solidifying an organic material or the like to cover the core wire connection portion. There are difficulties in drawing out the repeater core wire and maintaining and inspecting the core wire connection section. Therefore, after connecting the core wires and inserting auxiliary lead pipes to both terminals and using the main lead pipes, the core +11! The auxiliary lead pipe method for covering the connection part allows the main lead pipe to be 11 m long, making it easy to inspect the condition of the core wire, pull out the core wire, etc., and the vertically divided portions can be easily sealed with lead work. , is often adopted.

This conventional auxiliary lead pipe method will be explained with reference to FIG. ◎Polyethylene jacket cable at the end of cable 1. Core wire 1 with peeled off! are connected to core wires of other opposing cables (not shown). A self-adhesive tape is wound around the end portion of the tape layer 4. is formed. The inner diameter is approximately equal to the outer diameter of cable 1,
Connect the auxiliary lead pipe 3, which has a larger inner diameter on the other end side, to the cable l in advance.
Loosely fit it into the large inner diameter part 3. is the tape layer 4.
Move it so that it fits in. The main lead pipe 2 covering the core wire connection part is shifted, and the narrowed double end is glued to the outer periphery of the large inner diameter part 3. This bonded part is made of lead and then soldered with solder 5 to strengthen it. The outer periphery of the auxiliary lead pipe 3, the shaft, and the polyethylene jacket 11 is wound with self-adhesive tape, and a tape layer 4 is formed to maintain adhesion between the auxiliary lead pipe 3 and the polyethylene jacket 11, and airtightness. Further, the outer periphery of the tape layer 4 is wrapped with adhesive aluminum tape to block ultraviolet rays and prevent deterioration of the self-bonding tape.

In this way, since there is no adhesive that can directly bond the auxiliary lead pipe and polyethylene, they are attached using self-adhesive tape.

However, with the conventional method, the airtightness of the self-bonding tape may deteriorate due to aging, and the winding of the self-bonding tape requires skill, and the tape layer also deteriorates. This made it difficult to work inside narrow manholes.The purpose of the present invention is to solve the above-mentioned conventional problems by mechanically crimping the auxiliary lead pipe, thereby creating an airtight structure without requiring any skill. The purpose of the present invention is to provide a polyethylene cable sheath connection method that maintains its properties over many years.The purpose is to fold back the polyethylene jacket Q terminal to form a polyethylene terminal layer, and wrap the terminal layer with adhesive glass tape. After wrapping, the cable terminal side of the cough glass tape layer is wrapped with copper wire, and the IAs is wrapped with sealing tape.
This is achieved by a covered connection method in which the nine ends are fitted and crimped into the sealing tape layer and are bonded to the steel wire, and the outer circumference of the nine auxiliary lead pipes is connected to the end 11 of the main lead pipe, as shown in the drawings below. The present invention will be explained in detail with reference to an embodiment.@ Fig. 2 is a process diagram of the connection work of one embodiment of the present invention F140, and the types of work are as follows.

■ Turning the polyethylene jacket cable 1 (refer to 1) Wrap the copper wire 8 around the end of the polyethylene jacket cable 1 and tighten it, and make several cuts on the end side of the polyethylene jacket 7.0 steel wire 8. 7il and polyethylene jacket 7. Divide and peel to make it moist.

■ Terminal layer formation (see opening)...The split and peeled outer sheath is folded back at 80 points of steel wire, and the terminal layer 71' is formed on the upper surface of the polyethylene outer 7□.

■ Gas tape wrapping (see C)...terminal 1II7*
' and the terminal layer 71 of the polyethylene jacket 7@
A glass tape layer 9 is formed by winding an adhesive glass tape around the boundary portion of .

■ Copper wire winding (see 2)... Wrap the steel wire 10 several times near the steel [8] on the top of the glass tape layer to tighten it ■ Sealing tape layer formation (see e)... Steel # 11
A trapezoidal sealing tape layer 11 is formed by winding a predetermined length of sealing tape from the vicinity of G to the glass tape layer 9 side. is the one that is connected to the core wire facing the front. 0 ■ Attachment of auxiliary lead pipe (see )... A predetermined length that has been loosely fitted into the polyethylene sheathed cable 7 before connecting the core M. Fit the auxiliary lead pipe 12 onto the sealing tape layer 11, and fix both ends of the sealing tape layer 110 into a trapezoidal shape. A ring-shaped O recess 12' is formed at the end opposite to the steel wire 10 of the O auxiliary lead pipe 120 to be attached, and at a location ti on the outer circumference of the cylinder, for example, by rolling or wrapping the front with wire. 0 ■ Attaching the main lead pipe (see below)...Pre-squeeze the end of the main lead pipe 1510, which has been fitted with the center ia connection gK, to the cable 7 via the sealing tape layer 11.
0 closely to the outer periphery (lead is fused with a torch or the like), and further reinforced and fixed with solder mound 14. As shown in (g), this process is performed after connecting the opposing 7° ends of the polyethylene sheathed cables using steps ■ to ■. Terminal layer 7'
Since the pipe is formed with FIG. 3 shows another embodiment of the present invention in which the core wires are branched.

In the figure, reference numeral 16 denotes a branch wire in which a part of the core wire of the polyethylene-sheathed cable 1 is branched at a core wire connection portion and coated with lead. In this case, the main feed pipe 150 caliber is sufficient to accommodate the auxiliary lead pipe 12.
Therefore, the main lead pipe 150j11 has a large opening compared to the outer diameter of
Since it is difficult to narrow down one part, the end plate 15 is made of lead material.
．． The outer peripheral surface of the end plate 151 is attached to the end surface of the main lead pipe 15 and the inner peripheral surface to the outer peripheral surface of the auxiliary lead pipe 12, respectively, and then soldered, and the branch wire 16 is passed through the insertion hole of the end plate 151 to connect the outside. Pull out the drawer, fill the insertion hole with lead, solder it, and seal it.

As explained above, the present invention mechanically crimps the auxiliary lead pipe to the polyethylene outer sheath and makes it adhere tightly.The adhesion work is easy and does not require any skill, the airtightness is maintained for a long period of time, and the auxiliary lead pipe This is an ib-polyethylene cable sheathed connection method that has excellent practical effects such as shortening the total length of the connection part because of its short length.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the conventional connection method, Figure 2 is a sectional view showing the conventional connection method.
(G) is a manufacturing process diagram of one embodiment of the present invention, and FIG. 3 is a sectional view showing another embodiment. In the figure, 1 and 7 are polyethylene jacketed cables, 11°7 is a polyethylene jacket, 117t is a core wire, 3.12 is an auxiliary lead pipe, 2.15 is a main lead pipe, 4 is a self-bonding tape layer, 6 is aluminum Tape, 8 and 10 are copper wires, 9 is glass tape layer, 1
One company's sealing tape layer is shown respectively. P1 figure

Claims (1)

[Claims] How to connect the core wires of polyethylene jacketed cables by covering them with lead pipes? folding back the polyethylene jacket at the end of the cable to form a polyethylene end layer;
After wrapping the terminal layer with adhesive glass tape, the cable terminal side of the cough glass tape layer is wrapped with steel wire, the remaining part is wrapped with a sealing tube, and the nine ends are fitted and crimped onto the sealing tape layer. ◇ A method for connecting polyethylene cables, characterized in that the outer circumference of the auxiliary lead pipe is attached to the end of the main lead pipe by bonding the outer part of the auxiliary lead pipe to the copper wire.