JP2000217240A - Cable tip guide device - Google Patents

Abstract

(57) [Problem] To provide a cable tip guide device which can be smoothly laid particularly in a curved portion in a sinus in a bundle of three single-core power cables. SOLUTION: This is a tip guide device used when laying three single-core power cables piled in a bale in a sinus, and is independently provided for each single-core power cable via a untwist. It is composed of a cone-shaped tip guide rod made of polyethylene, which can be attached by mounting, and a tip-opening suppression plate having three holes into which each of the three tip-guide rods is inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable tip guide device for smoothly laying a bent portion in a method for laying three single-core power cables collectively in a tunnel, for example.

[0002]

2. Description of the Related Art In general, as a method for laying three single-core power cables at a time, a method of laying in a dedicated conduit is known. In this case, the ends of three cables are collectively restrained and the ends are winched. Is adopted. For example,
As shown in FIG. 4, at the tip of each single-core power cable 10, each cable conductor 11 is previously exposed at a factory,
A compression sleeve 41 is attached to the cable conductor 11,
A waterproof / protective layer 43 is put over the compression sleeve 41 and the cable insulator 13, and the thus formed power cable is wound around three separate cable drums and transported to the site. Then, at the drawing site, a disk-shaped fixing plate 45 having three holes is screwed into the tip of each compression sleeve 41 and integrally attached, and this is inserted into a hole of the pulling eye cover 47 having the hook 49. Fix it. A wire is attached to the hook 49 at the tip of the pulling eye cover to perform a pull-in operation.

[0003]

In the case of laying three cables in a lump in a tunnel, it is possible to lay the cable in a straight section by using the above-described method of lumping the tip, which has been conventionally adopted for pipe laying. There is no problem, but if the cave part to be laid includes a bent part, the three cables will twist each other during the laying work,
By exhibiting the behavior of rotation as a whole, not only is it impossible to store it in a predetermined position, but also it is impossible to lay it in a bent portion.

If the ends of the three cables are not constrained, twisting and rotation of the three cables will not occur even if longitudinal deviations may occur between the cables due to differences in the cable circumferences inside and outside the bend. Although it has been found that it is possible to lay the bend without any occurrence, no solution has yet been established for the method of guiding the cable tip.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. For example, a tip guide device capable of smoothly laying a single-core power cable bundled together in three sections in a curved portion in a sinus canal. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION The present invention is a tip guide device for smoothly laying, for example, a single-core power cable piled up in three rows at a bend in a sinus road. It is composed of a conical tip guide rod which is independently attached to each strip, and a tip opening suppression plate having three holes into which each of the single-core power cables for suppressing the opening of the three tip guide rods is inserted. Is what is done.

That is, a conical tip guide rod attached to the tip of each of the plurality of single-core power cables via a untwisting mechanism, and a tip for integrating the tips of the plurality of single-core power cables together. And a tip opening inhibiting plate having a plurality of holes into which the tip guide rod is inserted.

The tip guide rod includes a metal portion screwed to the untwisting mechanism portion, a conical plastic portion holding a wire on an inner central axis joined to the metal portion, A pulling eye provided at a tip of the shaped plastic portion, wherein the metal portion and the pooling eye are connected by the wire.

Further, the tip guide rod has a predetermined length determined by the amount of deviation in the longitudinal direction of each cable generated according to the difference in the inner and outer circumferences at the bent portion of the cable laying path, and the product of the cable weight and the cable bending rigidity. And a length consisting of the sum of

According to the above configuration, for example, a cable bundled together in three lines is laid on a roller arranged in a sinus tract. A shift in the longitudinal direction occurs for each strip. For example, when the outer diameter of the cable is 140 mm, the deviation (peripheral difference) of the inner and outer cables of the cable stacked in three bales is 9
A curve of 0 degree results in about 220 mm. Tip guide rod is 3
Since the books are independent from each other in the longitudinal direction, the movement of the cable is not hindered.

[0011] Further, even when the tip of the cable enters the cable guide roller disposed in the bent portion, a tip opening restraint plate for suppressing each of the three tip guide bars from opening in the lateral direction is provided. Cable can be easily guided to In addition, the length of the distal end guide rod itself is equal to or greater than the amount of cable displacement, and the distal end opening preventing plate does not come off from the distal end guide rod.

In the bent portion, it is necessary to bend the cable itself.
The rigidity was so large that it was difficult to bend by human power.However, the tip guide rod, which has the same rigidity as the cable itself but has a conical shape that becomes thinner toward the tip, has the rigidity against bending at the tip. Can be reduced, so that the cable can be easily bent manually.

Further, since the untwisting mechanism is interposed between the tip guide rod and the cable, the rotation of each cable during the laying which is conventionally recognized is not hindered. An excessive force is not applied to the guide rod itself, and there is no danger of the tip guide rod jumping up even for a worker who guides with the tip, and the work surface is safe.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing a state where a cable tip guide rod 1 of the present invention is attached to a tip of a single-core power cable 10. That is, the cable conductor 11 at the distal end of the single-core power cable 10 is exposed, and a compression sleeve 12 is put on the cable conductor 11 to be compressed and connected. Then, a waterproof / protective layer 14 is applied from the compression sleeve 12 to the cable insulator 13. The compression sleeve 12 is threadably connected to the untwisting device 15. Subsequently, the cable tip guide rod 1 is attached to the untwisting device 15 by screwing.

The distal end guide rod 1 is provided on a metal portion 2 having a threaded portion, a polyethylene cone-shaped body 3 joined to the metal portion 2, and a tip of the cone-shaped body 3. It is formed from a pooling eye 4, and the pooling eye 4 and the metal part 2 are connected by a wire 5 provided on the central axis of the polyethylene conical body 3.

As shown in FIG. 2, when the three single-core power cables 10 are collectively pulled in, the cable end guide rods 1a, 1b, 1c are opened at the ends to form holes 21a, 21a,
21b and 21c.

As shown in FIG. 3, the thus formed cable bundled together in three lines is extended on a roller 30 arranged in a sinus.

In the curved portion of the sinus, a deviation in the longitudinal direction occurs for each cable according to the difference in the circumferential length between the inside and the outside of the curved portion, but three tip guide rods 1 are independent of each other in the longitudinal direction. As a result, the movement of each cable due to the displacement is not hindered.

The length of the guide rod 1 at the end of the cable is equal to or greater than the amount of cable displacement (500 kV 300 in the embodiment).
In the case of a 0 mm ² CV cable, the amount of displacement of the bend perimeter L + 1
m), so that the opening prevention plate 20 does not come off from the cable end guide bar 1.

In the above embodiment, three single-core power cables are collectively laid in a sinus. Similarly, two single-core power cables are collectively or four single-core cables. Naturally, the present invention can also be implemented when the power cables are laid in the tunnel in a lump.

[0021]

As described above, according to the cable tip guide device of the present invention, the following effects can be obtained.

(1) A plurality of single-core power cables can be guided by a small number of people at the bend in the sinus path by reducing the rigidity of the cable tip even when, for example, three cables are bundled. .

(2) Eliminating the opening of the cable tip at the bend in the canal can prevent the guide roller or the sheave from getting caught when the cable enters the bend, and the installation speed can be increased. Become.

(3) Since the tip guide rod and the cable are joined via the untwisting device, they do not hinder the rotation of each cable during laying, so that the tip guide rod itself cannot be used. No force is applied, and there is no danger such as jumping up of the tip guide rod for a worker who guides with the tip, and the work surface is safe.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a state where a cable tip guide rod of the present invention is attached to a tip of a single-core power cable.

FIG. 2 is an explanatory view showing a state of a cable end in which three single-core power cables are bundled, wherein FIG. 2A shows a state in which a tip opening suppressing plate is fitted around a cable end guide rod; () Is a perspective view of a tip opening suppressing plate.

FIG. 3 is an explanatory view showing a state in which three single-core power cables are collectively extended on rollers arranged in a sinus.

FIG. 4 is a side cross-sectional view showing a configuration of a conventional pulling eye for pulling in a power cable that is bundled in three lines.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Cable tip guide rod 2 Metal part 3 Polyethylene cone shaped body 4 Pulling eye 5 Wire 10 Single core power cable 11 Cable conductor 12 Compression sleeve 15 Twist return device 20 Tip opening prevention plate 30 Roller

Continued on the front page (72) Inventor Masakatsu Utsunomiya 1-5-1 Kiba, Koto-ku, Tokyo Fujikura, Inc. (72) Inventor Hisaharu Nozaki 1-5-1, Kiba, Koto-ku, Tokyo In Fujikura, Inc. (72 ) Inventor Kazuaki Yoshida 1-5-1 Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (72) Inventor Hiroshi Yamanouchi 1-5-1 Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (72) Inventor 400 Shigeo Kari 1-5-1 Kiba, Koto-ku, Tokyo F-Terminal Co., Ltd. F-term (reference) 5G375 AA02 BA15 CD04 DA20 DA25 EA17

Claims (3)

[Claims] 1. A conical tip guide rod attached to a tip of each of a plurality of single-core power cables via a untwisting mechanism, and a tip for integrating the tips of the plurality of single-core power cables collectively. And a tip opening inhibiting plate having a plurality of holes into which the tip guide rods are inserted, and a cable tip guide device. 2. The tip guide rod includes a metal portion screwed into the untwisting mechanism portion, a conical plastic portion holding a wire on an inner central shaft joined to the metal portion, and a conical weight. The cable tip guide device according to claim 1, further comprising a pooling eye provided at a tip of the shaped plastic portion, wherein the metal portion and the pooling eye are connected by the wire. 3. The guide rod according to claim 1, wherein the guide rod has a predetermined length determined by a product of a cable weight and a cable bending rigidity, the amount of deviation in the longitudinal direction of each cable generated according to a difference in inner and outer perimeters in the cable laying path bending portion. 3. The cable tip guide device according to claim 2, wherein the cable tip guide device has a length that is the sum of