JPH04215281A - Method of filling moistureproofing mixture - Google Patents

Abstract

PURPOSE:To fill a moistureproofing mixture in a moistureproofing mixture container formed in a simplified manner, using a self-adhesive foaming polypropyrene sheet such that this sheet is allotted to a cable core exposure portion as the occasion demands but not using cable-size halved hard plastic casings. CONSTITUTION:A straightforward sausage-shaped bag body 53 is formed by causing a spacer net, in which is contained in a wound condition a bundle of cable core wires exposed with their outer covering being peeled off, to be surrounded by a self-adhesive foaming polypropyrene sheet with a gap therebetween, causing two, up positioned, opposing sheet ends to contact with each other and be opened as a charging port 4 at their central portion but be bonded together at their entire peripheral portions to thereby cause the sheet to be shaped like a bag, and causing both side portions orthogonal to the axis to be constricted onto the cable 1 and be fixed by fastening bands. This bag body is made a moistureproofing mixture container. Then, the charging port is gripped and the mixture is charged therefrom.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method for preventing deterioration of color-coded polyethylene-coated overhead communication cables (hereinafter referred to as CCP cables), and in particular a method for filling cable core connections with a moisture-proofing compound. Regarding.

0002

[Prior Art] Generally, it is not necessary to fill the exposed core portions of CCP cables with a moisture-proofing compound for connecting parts and subscriber withdrawals, but as the exposed core portions containing the insulation coating age, Filling with moisture-proofing admixtures is carried out only when specifically specified to prevent deterioration.

FIG. 4 is a partial vertical sectional view of a conventional example of a cable connection portion of a CCP cable.

[0004] At the connection part of this CCP cable 1, the connected core wires are gathered into one bundle, and the bundle is wound with a spacer net 3 at right angles to the longitudinal direction of the cable 1, with this part as the center. A pair of half-split hard plastic cases 11 are combined, and both ends are fixed with adhesive tape 12 so that the injection port 111 is at the top, and the two liquids are mixed from the injection port 111. Mixture 4 was injected and hardened by natural hardening.

[0005]

[Problems to be Solved by the Invention] The conventional method of filling a moisture-proofing mixture described above uses a pair of halved hard plastic cases as containers for accommodating the moisture-proofing mixture. Since the size of the CCP varies depending on the outer diameter of the overhead cable, it must be equipped with many types of half-split hard plastic cases for each size, and if the CCP cable is to be branched and connected, it must be equipped with a moisture-proof compound. Even if it is necessary to fill the container with a moisture-proofing mixture, there is no corresponding half-split hard plastic case, so the moisture-proofing mixture cannot be filled.

[0006] An object of the present invention is to provide a method for filling a moisture-proofing mixture without requiring half-split hard plastic cases for different sizes of overhead cables.

[0007]

[Means for Solving the Problems] The method for filling the moisture-proofing mixture of the present invention is to fill a space on the outside of a spacer net in which a bundle of cable core wires exposed by peeling off the outer jacket is wrapped. Surround the soft plastic sheet with a self-adhesive soft plastic sheet, place the two opposing sides of the soft plastic sheet facing each other above, leave the central part open, and glue the entire periphery of the soft plastic sheet to a predetermined width. The plastic sheet is made into a bag shape, both sides perpendicular to the axis of the cable are squeezed onto the cable, and the cable is tightened at that part, and the moisture-proofing mixture is injected through the opening of the soft plastic sheet.

[0008]

[Operation] A self-adhesive soft plastic sheet is formed into a bag shape with an injection port opened at the center of the upper part, with a bundle of connected cable core wires inside. By squeezing and tightening both sides around the cable and injecting the moisture-proofing mixture with the injection port slightly raised, there is no need to use pre-formed hard plastic containers that are split into different sizes. It becomes possible to fill with moisture-proofing admixtures.

[0009]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1, 2, and 3 are stage-by-stage explanatory diagrams of the method of filling the moisture-proofing mixture of the present invention. FIG. 1 is a diagram of the cable connection section before attachment of the container, and FIG. 2 is a diagram showing the state of the cable connection before attachment of the adhesive sheet. FIG. 3 is a diagram of the situation of the cable connection at the start, and FIG. 3 is a diagram of the situation of the cable connection during filling with the admixture.

As shown in FIG. 1, the cable connection portion of this CCP cable consists of CCP cables (hereinafter referred to as cables) 1 that are connected to each other, and the outer jacket of each cable 1 is peeled off, the core wires are connected, and the insulation coating is removed. A core wire connection part 2 is a bundle of core wires with exposed core wires, and a non-conductive spacer net 3 is formed by winding the core wire connection part 2 along the longitudinal direction of the cable 1 at right angles to the longitudinal direction. Then, the end plates 12 are fixed near each end of the cable 1 to be connected, and the end plates 12 are connected to the bottom plate 8 by a connecting rod 9, and normally the core wire connection part 2 is connected to the top of the bottom plate 8. It consists of a connection terminal case 6 which is a protective case covered with a cover removably attached between both ends 12, and the core connection part 2 includes a spacer net and is surrounded by a moisture-proof mixture 4, which is shaped like a straight sausage. It is filled and solidified.

Next, the procedure for filling the moisture-proofing mixture will be explained.

First, a self-adhesive foamed polypropylene sheet (hereinafter referred to as an adhesive sheet) 5 is attached to the longitudinal end of the connecting terminal box 6 including the protruding portions 10 of the cable before separation, which protrudes inward from both ends in the longitudinal direction. The width is the length between the directions, and the length is the circumference of the longitudinal cross section of the shape to which the moisture-proofing mixture is attached, plus the extra length for adhering the opposite sides of the adhesive sheet. Cut it lengthwise. Next, Figure 2
As shown in FIG.
on the inside, the width is aligned with the longitudinal direction of the cable, and the opposing sides of the adhesive sheet 5 are placed 10 in the center above the core wire connection part 2 around which the non-conductive spacer net 3 is wound.
It sticks with a 52-minute gap left at the injection port, which is about cm. Thereafter, both sides of the adhesive tape 5 in the longitudinal direction of the cable 1 are adhered, and the sides are squeezed into the protrusion 10 in the connecting terminal holder 6 of the cable 1, and the tightening hand 7 or scraps are removed. A bag-shaped molded body 53 of the adhesive sheet 5 is fixed with a core wire.
shall be. Thereafter, as shown in FIG. 3, the injection port 52 left without adhesive is opened, and the corresponding part of the adhesive sheet is temporarily fixed to a part of the upper connecting rod 9 of the connecting terminal cover 6, and the two liquids are mixed. The moisture-proof mixture 4, which has become flowable, is poured into the injection port 52 until it is full, and this state is maintained to wait for the moisture-proof mixture 4 to harden naturally. When the moisture-proofing mixture 4 becomes non-flowing in about 30 minutes due to natural hardening and becomes hard enough to withstand vibration, the temporary fixation of the injection port 52 is released, and the cover is attached to the connection terminal hood 6 to complete the process.

[0014] The adhesive sheet 5 used in this example has a size of 360 mm long x 5 mm wide, which is generally used as a packaging material.
The foamed polypropylene impregnated with an adhesive was superimposed on a 00 mm polypropylene sheet to a thickness of about 1 mm, and then cut. Further, in this embodiment, a method of filling a moisture-proofing mixture into a cable connection part has been described, but this method can be applied not only to a cable connection part but also to an exposed part of a cable core in general.

[0015]

Effects of the Invention As explained above, in the present invention, when filling a moisture-proofing mixture, an adhesive sheet is formed into a container for storing the moisture-proofing mixture in accordance with the shape of the cable connection part. It can be applied to cables, and it can also be applied to connections with branch cables.Furthermore, the adhesive sheet adheres between adhesive surfaces but does not adhere to other objects, making it easy to work during molding. Because of its good watertightness, there is no risk of the moisture-proofing mixture being washed away during filling, and the price is low, which has the effect of reducing construction costs.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the state of the cable connection section before attachment of the container.

FIG. 2 is a diagram of the cable connection section before attachment of the adhesive sheet.

FIG. 3 is a diagram of the situation of the cable connection during filling with the admixture.

FIG. 4 is a partial longitudinal sectional view of a conventional cable connection section.

[Explanation of symbols]

1 Cable 2 Core wire connection part ３　　　　Spacer net 4 Moisture-proofing mixture 5 Adhesive sheet 51 Adhesive surface 52 Inlet 53 Bag-shaped molded body 6 Connection terminal 凾 7 Tightening band 8 Bottom plate 9 Connecting machine 10 Protruding part

Claims (1)

[Claims] Claim 1: In a method of filling a moisture-proofing mixture into an exposed part of a cable core whose jacket has been peeled off in an overhead communications cable, Surround the outside of the support net with a self-adhesive soft plastic sheet with a space left in between, and place the two opposing sides of the soft plastic sheet facing upward, leaving the central part open. Glue the entire periphery to a predetermined width to form a bag shape, squeeze both sides perpendicular to the axis of the cable onto the cable, tighten that part onto the cable, and apply moisture-proofing mixture through the opening of the soft plastic sheet. A method for filling a moisture-proofing mixture, characterized by injecting a substance.