JPH10336832A - Method and apparatus for assembling power cable connection part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to judge whether couplings fixed at the end of a conductor in a pair of power cables are well engaged or not easily. SOLUTION: After each coupling member is engaged to each other, a screw rod 30a is turned to move a nut member 24a, and a power cable 1 is pulled away from another power cables through a holding bracket 42 and a cable supporting table 22a. Then, the load at this time is measured by a load cell 43. When the power cable 1 is not moved, even though the measured value may be larger than resisting force, the couplings are judged to be engaged surely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling method and an assembling apparatus for a power cable connecting portion, which are used for connecting ends of a high-voltage cable for power transmission, wherein coupling members provided at the connecting portion are connected to each other. By making it possible to confirm that the engagement is reliable, it is possible to prevent the occurrence of connection failure.

[0002]

2. Description of the Related Art To provide a high-voltage transmission line of several hundred thousand volts in an underground tunnel, a power cable for power transmission is disposed in the underground tunnel. Then, ends of the power cables arranged in series with each other are connected in an underground tunnel. As described above, as a structure of a connecting portion for connecting ends of a power cable in an underground tunnel and an assembling apparatus for assembling the structure of the connecting portion, a conventional structure is disclosed in Japanese Patent Application Laid-Open No. Hei 9-117.
No. 029 is known. FIG.
Indicates a power cable connecting portion described in this publication.

[0003] A pair of power cables 1 to be connected to each other,
The ends of the conductors 2 and 2 are exposed by removing a predetermined length of the corrugated outer layers 3 and 3 and the semiconductive layers 4 and 4 and the insulators 5 and 5 at the end of the conductor 2. 2 are connected to the conductor connecting members 8 and 8 and the coupling member 6 respectively.
a and 6b are fixed. The conductor connection members 8 are made of a metal having good conductivity such as copper or a copper alloy, and are used for electrical connection between the conductors 2 and 2. Each of the coupling members 6a and 6b is generally known in the art, for example, as described in Japanese Patent Application Laid-Open No. 6-307421, and is mainly made of a metal having high mechanical rigidity such as stainless steel. The leading ends are brought close to each other and fitted to each other so that they are connected to each other. After the connection, the leading ends cannot be separated, and the mechanical connection strength between the conductor connecting members 8 is secured. The operation of fixing such coupling members 6a and 6b to the ends of the conductors 2 and 2 via the conductor connection members 8 and 8 is performed as shown in FIGS. 4A to 4C. Do it.

[0004] First, as shown in FIG. 4A, the corrugated outer layers 3 and 3 and the semiconductive layers 4 and 4 are removed from the ends of the pair of power cables 1 and 1 to form an insulator 5. 5 are exposed by the desired length. Next, as shown in FIG.
Is exposed for a desired length, and the remaining insulator 5,
A tapered conical surface 7, 7 is formed on the outer peripheral surface of the distal end portion 5 of FIG. Next, as shown in FIG. 2C, the coupling members 6a and 6b are fixed to the ends of the conductors 2 and 2 via the conductor connection members 8 and 8, respectively.

When the conductor connecting members 8 and 8 and the coupling members 6a and 6b are fixed to the ends of the conductors 2 and 2 as described above, as shown in FIG. ,
These conductor connecting members 8, 8 and coupling members 6a,
6b is inserted inside the insulating block 9. Then, the coupling members 6a and 6b are engaged with each other at an intermediate portion inside the insulating block 9 as shown in FIG. Note that a conductor contact member 10 made of a metal having good conductivity such as copper is provided at an intermediate portion inside the insulating block 9 to electrically connect the pair of conductor connection members 8 to each other. A high-voltage shield electrode 46 is provided. or,
The center hole 13 of the insulating block 9 supports and fixes the conductor contact member 10 and the high-voltage shield electrode 46 at the center, and the inner diameter of the portion near both ends is set at the end of the pair of power cables 1, 1. In order to facilitate insertion of the exposed insulators 5, the outer diameters of the insulators 5 are slightly larger than the outer diameters of the insulators 5. Therefore, if each of the insulators 5, 5 is inserted into the insulating block 9, this insulating block 9
The semi-conductive layer 12 is coated on the outer peripheral surface of the reinforcing insulating layer 11 and the insulating block 9 is heated so that the inner peripheral surface of the reinforcing insulating layer 11 and the outer peripheral surface of each of the insulators 5, 5 are adhered to each other. Let it.

As described above, the pair of power cables 1, 1
Are connected inside the insulating block 9 via the conductor connecting members 8, 8 and the coupling members 6a, 6b, and the semiconductive layer 12 is formed on the outer peripheral surface of the reinforcing insulating layer 11. When the inner peripheral surface of the reinforcing insulating layer 11 is brought into close contact with the outer peripheral surfaces of the insulators 5, 5, the periphery of the insulating block 9 is covered with a waterproof mixture 14, and The periphery of the mixture 14 is covered with a protective tube 15. An axially intermediate portion of the protection tube 15 is an insulating tube 16.
Similarly, between both ends of the protective tube 15 and the outer corrugated layers 3 and 3 constituting the outermost layers of the power cables 1 and 1, there are waterproof layers 17 and 17 respectively.
Is provided.

By the way, as shown in FIGS. 3 (D) and 4 (E), conductor connecting members 8, 8 and a coupling member 6a are provided in an insulating block 9 to constitute a connecting portion for a power cable as shown in FIG. , 6b is also inserted in JP-A 9-1.
This is carried out by using a power cable connecting unit assembling apparatus 18 as shown in FIGS.
The reason for using such an assembling apparatus will be described with reference to FIG.

When the ends of the pair of power cables 1 and 1 are connected to each other, portions near the ends of the power cables 1 and 1 are fixed to fixing jigs 19 and 19 called cleats, respectively.
Thus, the power cables 1 and 1 are fixed to a part of an underground tunnel in which the power cables 1 and 1 are provided. The distance D 19 between these fixing jigs ₁₉ is, for example, about 9 m. On the other hand, these fixing jigs 19, 19
Total length of the projecting portion than is larger than the distance D _19. The leading ends 1a, 1a of the power cables 1, 1 are laterally shifted (offset) from the portions near the center of the power cables 1, 1 by a larger amount. Such an offset is performed by inserting the conductor connecting members 8 and 8 and the coupling members 6a and 6b into the insulating block 9 and further engaging the coupling members 6a and 6b with each other. It is necessary to absorb the expansion and contraction of each of the power cables 1 and 1 due to a temperature change.

On the other hand, the power cables 1 and 1 for constituting a high voltage transmission line of several hundred thousand volts can be said to be flexible.
Relatively high rigidity. In addition, when the distal ends 1a, 1a of the power cables 1, 1 are to be displaced away from each other, the distal ends 1a, 1a are opposed to each other.
A force is applied in a direction in which a is brought closer to each other. This force, called the repulsive force, is considerably large. For example, in the case of a power cable for power transmission of 275 KV, it may reach about 1 t. Accordingly, the insulating block 9 and the pair of conductor connecting members 8, 8 and the coupling members 6a, 6b are aligned with each other, and the conductor connecting members 8, 8 and the coupling members 6a, 6b are provided in the insulating block 9. It is not possible to manually insert the. In view of such circumstances, using the assembling apparatus 18 as shown in FIGS. 5 and 6, the conductor connection members 8, 8 and the coupling members 6a, Insertion of 6b is conventionally known, as described in JP-A-9-296106.

The assembling apparatus 18 converts the long rectangular fixed frame 20 in the length direction of the fixed frame 20 (FIGS. 5 to 6).
Of the power cables 1, 1 (FIGS. 3, 4, and 7) to be connected to each other. The fixed frame 20 is disassembled so that it can be carried into an underground tunnel where the connection work between the power cables 1 and 1 is performed, and further, unnecessary parts can be removed as the connection work progresses. It can be assembled freely. An insulating block support table 21 is provided at the center of the upper surface of such a fixed frame 20, and a pair of cable support tables 22a and 22b are provided at portions near both ends in the length direction (left and right directions in FIGS. 5 to 6). It is provided movably. Of these, the insulating block support table 21
At the center of the fixed frame 20, only the movement in the length direction is freely provided.

That is, the insulating block support table 21
5 is engaged with a guide rail 23 disposed in the length direction of the fixed frame 20. Also, a nut piece 2 fixed to a portion of the insulating block support table 21 closer to the other side of the lower surface (the lower side in FIG. 5).
4 and 24 are screwed into a screw rod 25 arranged in the length direction of the fixed frame 20. The screw rod 25 is supported on the fixed frame 20 so as to be rotatable only. A driven bevel gear fixed to an end of the screw rod 25 and a drive shaft 26 provided in a direction orthogonal to the screw rod 25.
And a first axial feed handle 27 fixed to the other end of the drive shaft 26 (the lower end in FIG. 5). A first feed screw mechanism for displacing the insulating block support table 21 in the length direction of the fixed frame 20 by rotatably driving the drive shaft 26 is configured. This first feed screw mechanism constitutes a part of the axial moving means according to the second aspect.

On the other hand, the pair of cable support tables 2
2a and 22b are provided on the upper surface of both ends of the fixed frame 20 in the length direction and the width direction of the fixed frame 20 (FIG. 5).
(Up and down direction). The cable support tables 22a and 22b are fixed to the fixed frame 20.
In order to be movable in the length direction of the fixed frame 20, axially movable tables 28a and 28b are provided on the upper surface of both ends in the length direction of the fixed frame 20 along the length direction of the fixed frame 20, respectively. It is provided movably along the guide rails 29a, 29b. Then, similarly to the first feed screw mechanism described above, each of the second and third axial feed handles 32 and 33 includes screw rods 30a and 30b, drive shafts 31a and 31b, and second and third axial feed handles 32 and 33, respectively. The third feed screw mechanism allows each of the axial moving tables 28a and 28b to be movable in the length direction of the fixed frame 20. The second and third feed screw mechanisms together with the first feed screw mechanism constitute an axial moving means according to the second aspect.

Then, each of the axially movable tables 28a, 28
b above each cable support table 22
a, 22b are movably supported in the width direction of the fixed frame 20. That is, each of the above-described axial moving tables 28
Guide rails 34a, 34b are respectively provided on the upper surfaces of the fixed frames 20, and the cable support tables 22a, 22b are movably provided along the guide rails 34a, 34b. ing. Then, screw rods 35a, 35b which are arranged in parallel with the respective guide rails 34a, 34b and are rotatable only on the respective axial moving tables 28a, 28b, and are fixed to the lower surfaces of the respective cable support tables 22a, 22b. Nut pieces 36a and 36b are screwed together. Each screw rod 3 above
Reference numerals 5a and 35b form fourth and fifth feed screw mechanisms rotatably driven by first and second width-direction feed handles 37 and 38 fixed to the respective ends.
These fourth and fifth feed screw mechanisms constitute the center axis matching means according to the second aspect.

With the assembling apparatus 18 configured as described above,
As shown in FIGS. 4 (D) and 4 (E), the conductor connecting portions 8 and 8 and the coupling members 6a and 6b are provided in the insulating block 9.
The work of inserting the distal end portions of the conductors 2 and 2 with fixing the first, second and third axial feed handles 27, 32 and 33
The operation is performed as shown in FIGS. 8A to 8H by operating the first and second width-direction feed handles 37 and 38 in a predetermined order. When performing the above operation, do not allow each part to move excessively (the above handles 27, 32,
In order to keep the operation amounts of 33, 37, and 38 to the minimum necessary), the movement amount of each part is regulated, and this point is described in the above-mentioned Japanese Patent Application Laid-Open No. 7-1117029.
In addition, since it has nothing to do with the gist of the present invention, the gist of the above operation will be described below.

First, as shown in FIG. 8A, a pair of cable support tables 22a and 22b are moved to the opposite side of the fixed frame 20 in the width direction and to the center in the length direction. The ends of the power cables 1 and 1 are fixed to the upper surfaces of the cable support tables 22a and 22b, respectively.
This fixing work is performed by each of the cable support tables 22a,
This is performed by holding down the outer peripheral surface of the outer corrugated layer 3 constituting the outermost layer of the power cables 1 and 1 by the cable holding jig 39 provided on the upper surface of 22b. The ends of the power cables 1 and 1 expose the ends of the conductors 2 and 2 in advance as shown in FIG. The members 8, 8 and the coupling members 6a, 6b are fixed.

Next, as shown in FIG. 8B, the pair of cable support tables 22a and 22b are respectively retracted toward the longitudinal ends of the fixed frame 20 in directions away from each other. Then, in this state, the insulating block 9 is fixed on the upper surface of the insulating block support table 21 as shown in FIG. This fixing operation is performed by holding down the outer peripheral surface of the intermediate portion of the insulating block 9 by the block holding jig 40 provided on the upper surface of the insulating block support table 21. At this time, the insulating block support table 21 is moved to one end in the length direction of the fixed frame 20 (the right side in FIG. 8).

Next, as shown in FIG. 2D, the other cable support table 22b (left side in FIG. 8) is moved to the center in the width direction of the fixed frame 20, and the cable support table 22b Power cable 1 fixed on top
And the center axis of the insulating block 9 are aligned. Thereafter, as shown in FIG. 8E, the insulating block support table 21 is moved to the other end of the fixed frame 20 in the longitudinal direction (the left side in FIG. 8), and the insulating block 9 is moved.
Over the end of the conductor 2 of the power cable 1 supported on the upper surface of the other cable support table 22b, and the conductor connecting member 8 and the coupling member 6b fixed to this end (the conductor connecting member 8 and the cup). The ring member 6b is inserted into the insulating block 9.)

Next, as shown in FIG. 8F, the one cable support table 22a is attached to the fixed frame 20.
The center axis of the power cable 1 fixed to the upper surface of the cable support table 22a and the center axis of the insulating block 9 are aligned. Thereafter, as shown in FIG. 8G, the other cable support table 22b and the insulating block support table 21 are moved toward one end of the fixed frame 20 in the longitudinal direction (the right side in FIG. 8). One cable support table 2
2a is moved toward the other end of the fixed frame 20 in the longitudinal direction (the left side in FIG. 8), whereby the insulating block 9 is moved.
To the ends of the conductors 2 and 2 of the power cables 1 and 1 and the conductor connecting members 8 and 8 and the coupling members 6a and 6b fixed to the ends (the conductor connecting members 8 and 6).
8 and the coupling members 6a, 6b are inserted into the insulating block 9). As a result, the pair of power cables 1, 1 supported on the upper surfaces of the cable support tables 22a, 22b, respectively, were fixed to the distal ends of the conductors 2, 2 constituting the pair of power cables 1, 1 via the conductor connection members 8, 8, respectively. The distal ends of the pair of coupling members 6a and 6b are engaged with each other at the center of the inside of the insulating block 9 as shown in FIG. Combined inseparably.

In this manner, the pair of conductors 2 and 2 are connected to each other by the conductor connecting members 8 and 8 and the coupling member 6.
8A and 6B, the insulating block support table 21 and the central part of the fixed frame 20 are removed from the periphery of the insulating block 9 as shown in FIG. Then, in order to make the inner peripheral surface of the center hole 13 formed in the reinforcing insulator 11 constituting the insulating block 9 and the outer peripheral surface of the insulators 5 and 5 constituting the respective power cables 1 and 1 adhere to each other. The periphery of the insulating block 9 is covered with a heating vessel (not shown), and the reinforcing insulating layer 11 of the insulating block 9 and the insulators 5 and 5 are heated. When the inner peripheral surface of the reinforcing insulating layer 11 is brought into close contact with the outer peripheral surfaces of the insulators 5 and 5 based on this heating, both ends of the heating container and the fixed frame 20 are disassembled and removed. Next, around the insulating block 9, FIG.
Waterproof mixture 14, protective tube 15, insulating tube 1
6. Waterproof layers 17, 17 and the like are provided.

[0020]

When assembling the connecting portions of the power cables as described above, one to be connected to each other is required.
A pair of coupling members 6a, 6b fixed to the distal ends of the conductors 2, 2 constituting the pair of power cables 1, 1 via the conductor connecting members 8, 8 must be securely engaged with each other. If the coupling members 6a and 6b are not engaged with each other or the engagement is uncertain, the power cables 1 and 1 are displaced in a direction away from each other, and the insulating block 9 is displaced. Is subjected to tensile force. Furthermore,
At the time of power transmission, based on the thermal expansion of the insulating block 9 caused by the temperature rise of the power cables 1 and 1, the insulating block 9
The insulation function may be degraded by this. For this reason, conventionally, as shown in FIG.
The distance L between the marks on a part of the internal insulators 5 exposed at the ends of the pair of coupling members 6 is measured.
It was determined whether or not the tips of a and 6b were engaged with each other.

However, in order to determine the engagement state based on the distance L between the marks, a measurement accuracy of 1 mm or less is required. This not only causes inefficiency in the work of assembling the connection portion for the power cable, but also causes mental stress to the workers. The assembling method and assembling apparatus of the power cable connecting portion of the present invention have been invented in order to eliminate any such inconvenience.

[0022]

SUMMARY OF THE INVENTION Among the assembling method and assembling apparatus for a power cable connecting portion of the present invention, the invention of the method for assembling a power cable connecting portion according to the first aspect of the present invention is disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Hei 9-1997. In order to connect the ends of a power cable formed by covering a conductor with an insulator, a connection must be made in the same manner as in a method of assembling a connection portion for a power cable known in Japanese Patent Application Laid-Open No. 117029 and the like. After removing the ends of the insulators of the pair of power cables and exposing the conductors from the ends of the insulators, the conductors are connected to the tips of the conductors via conductor connecting members. Then, the two conductors were fixed to each other through the conductor connecting member by bringing the two conductors close to each other in a state where the center axes of the two conductors were aligned with each other. The above bracket Ring together, engage each other inside the structure the insulating block to the cylindrical, connects these two conductors to each other.

In particular, in the method of assembling the connection portion for a power cable according to the present invention, after the coupling members are engaged with each other, the pair of power cables supporting and fixing the ends of the pair of power cables. A force sufficiently smaller than a force that causes the coupling member to break is applied to at least one of the cable support tables in a direction in which the pair of cable support tables move away from each other. Then, based on the magnitude of this force and the presence or absence of displacement of the one cable support table, it is confirmed that the coupling members are engaged with each other.

The power cable connecting part assembling apparatus according to the second aspect of the present invention is also disclosed in Japanese Patent Application Laid-Open No. Hei 9-11702.
In the same manner as the power cable connecting portion assembling apparatus described in Japanese Patent Application Publication No. 9-1992 or the like, which should be connected to each other,
A pair of cable support tables capable of supporting and fixing the ends of the pair of power cables on their respective upper surfaces, and an insulating block fitted around the connection between the ends of the pair of power cables on the upper surface. A fixed insulating block support table, and at least two of the insulating block support table and the pair of cable support tables are fixed to the pair of power cables and the central axis of the insulating block. By moving at right angles, these 1
A center axis matching unit that matches center axes of the pair of power cables and the insulating block with each other; and at least two support tables of the insulating block support table and the pair of cable support tables. By moving the pair of power cables and the insulating block in the central axis direction, the pair of power cables fixed to the ends of the conductors exposed from the ends of the insulators constituting the pair of power cables via a conductor connecting member. And an axial moving means for allowing the coupling member to be freely inserted into the inside of the insulating block.

In particular, in the power cable connecting portion assembling apparatus of the present invention, a cable support table which is moved in the axial direction of the power cable by the axial moving means, and the cable support table is connected to the power cable A load detecting means is provided between the driving means for moving the power cable in the axial direction and a driving force applied to the cable supporting table from the driving means and extending in the axial direction of the power cable.

[0026]

According to the assembling method and assembling apparatus of the power cable connecting portion of the present invention configured as described above, a pair of power cables are fixed to the distal ends of the conductors constituting the pair of power cables via the conductor connecting member. It can be reliably determined whether or not the coupling members are securely engaged with each other without particularly troublesome work. That is, in order to determine whether or not the pair of coupling members are securely engaged with each other by the power cable connecting portion assembling apparatus according to claim 2, the coupling members are engaged with each other. Then, the pair of cable supporting tables tend to move relatively in a direction away from each other, and the pair of power cables are pulled in a direction away from each other. At this time, there is a tendency that one or both cable support tables are relatively moved with respect to the other cable support table by a detected value of the load detecting means with a force sufficiently smaller than a force that leads to the destruction of the coupling member. Then, it is confirmed that the coupling members are engaged with each other by the one or both cable support tables not moving. In addition, the force sufficiently smaller than the force that leads to the destruction of the coupling member is, of course, a force that is smaller than the force that leads to the destruction of the engaging portion between the pair of coupling members. Rather than the force that leads to the destruction of the engaging portion with each conductor connection member, the force required to remove the tip of each conductor from each conductor connection member, and the force that leads to the damage of the coupling member and the conductor connection member itself, Say that it is a small force. In short, it means that the force is smaller than the force that can lead to destruction between the joints of a pair of conductors that are properly coupled.

[0027]

FIG. 1 shows a first embodiment of the present invention. The feature of the illustrated embodiment is that the assembling device 18 as shown in FIGS. 5 and 6 is used to form the inside of the insulating block 9 as shown in FIG. After the pair of coupling members 6a and 6b are inserted and the pair of coupling members 6a and 6b are engaged with each other, it is determined whether the coupling members 6a and 6b are securely engaged with each other. There is a structure for determining. Structure of the power cable connecting portion itself and the assembling device 18
For the overall configuration of Japanese Patent Application Laid-Open No. Hei 9-1117029,
As described in Japanese Patent Application Laid-Open Publication No. H10-205, the illustration and description of the same parts as those of the prior art are omitted or simplified, and the following description will focus on the characteristic parts of the present invention and the parts different from the prior art. I do. A feature of the power cable connecting unit assembling apparatus of the present invention is that the cable support table 22a (or 22b; the same applies hereinafter) is mounted in the axial direction of the distal end portion 1a of the power cable 1, that is, the fixed frame 20.
In the structure for moving in the length direction (the left-right direction in FIG. 1) (FIGS. 5, 6, 8), the two coupling members 6a, 6
The point is that a structure for determining whether or not b are securely engaged with each other is incorporated. The structure for moving the distal end portion 1a in the width direction of the fixed frame 20 (the front and back direction in FIG. 1) is not directly related to the present invention. Therefore, for the sake of simplicity, FIG. 1 (and FIG. 2 described later) does not show a mechanism for moving the cable support table 22a in the width direction of the fixed frame 20. FIG. 1 is opposite to the above-described FIG. 6 in the left-right direction.

A pair of clamps 41, 41 are provided on the upper surface of the cable support table 22a which is movable in the axial direction of the power cable 1 along the guide rail 29a, and are spaced apart in the axial direction of the power cable 1. I have. The power cable 1 is supported and fixed on the upper surface of the cable support table 22a by holding down the two clamps 41 by connecting the clamps 41 with bolts and nuts.
In this manner, the cable support table 22a for fixing the end portion 1a of the power cable 1 is used. In the case where the power cable 1 is actually incorporated in the assembling apparatus 18 shown in FIGS.
A U-shaped holding bracket 42 having a downward opening is fixed to the lower surface of a (28b)｝, and the nut piece 24a and the annular load cell 43 are held inside the holding bracket 42.

Through holes 44, 44 are formed at both sides of the holding bracket 42 in the axial direction, at portions matching the both ends of the screw holes of the nut piece 24a. The threaded rod 30a inserted through both of the through holes 44, 44 and the inside of the load cell 43 is screwed into the threaded hole of the nut piece 24a. In this state, the load cell 43 is sandwiched between one axial end surface of the nut piece 24a (the left end surface in FIG. 1) and the inner surface of the holding bracket 42. When the power cable 1 is moved in a direction away from another power cable to be connected to the power cable 1 (to the left in FIG. 1), the load cell 43 is connected to one end face of the nut piece 24 in the axial direction. The holding bracket 42 can be pressed in the compression direction between the holding bracket 42 and the inner surface thereof. Then, the measured value of the load cell 43 is taken out by a harness (not shown) and sent to a display (not shown), and the measured value is displayed on the display or an electric motor for rotating the screw rod 25 is rotated. Motor controller (when the screw rod 30a is driven by an electric motor)
To make the drive torque of the electric motor controllable.

When the power cable connecting device assembling apparatus of the present invention incorporating the load cell 43 as described above is used and the power cable connecting device assembling method of the present invention is performed,
The assembling work is performed in the following procedure. First, FIG.
As shown in (H), conductors 2 forming a pair of power cables 1 to be connected,
A pair of coupling members 6a, 6b fixed via the conductor connection members 8, 8 are inserted into the distal end of the pair 2, and the pair of coupling members 6a, 6b are engaged with each other.

After the pair of coupling members 6a and 6b are engaged with each other in this manner, the screw rod 30a shown in FIG. The power cable 1 supported on the upper surface of the support table 22a tends to move in a direction away from another power cable to be connected to the power cable 1. At this time, the cable support table 22b (FIGS. 5, 6, and 8) supporting the other power cable remains fixed. As described above, the other cable support table 22b
From the cable support table 22a, and the cable support tables 22a, 22b
The pair of power cables 1 respectively supported and fixed on the upper surfaces of the power cables 1 are pulled in a direction to move away from each other.

In this manner, by pulling one of the pair of power cables 1 to be connected to each other based on the engagement between the pair of coupling members 6a and 6b, A pair of coupling members 6
It can be determined whether a and 6b are securely engaged with each other. That is, if the pair of coupling members 6a and 6b are not engaged with each other or the state of engagement is uncertain even if they are engaged, the one cable support table 22a
Moves, and with this movement, the power cable 1 supported and fixed on the upper surface of the one cable support table 22a.
The coupling member 6a fixed via the conductor connecting member 8 to the tip end of the conductor 2 constituting the above comes out from the inside of the insulating block 9. For this reason, a pair of coupling members 6
It is possible to know that a and 6b are not engaged with each other or that the engaged state is uncertain even if they are engaged.

On the other hand, when the pair of coupling members 6a and 6b are securely engaged with each other, the coupling member 6a does not fall out of the insulating block 9. The force for retracting one cable support table 22a from the other cable support table 22b is caused by the coupling members 6a, 6b engaged with each other, the conductor connection members 8, 8, and the coupling members 6a, 6b. And is much smaller than the force that leads to the destruction of the joint with the conductor 2. For example, the tensile load that may lead to the destruction of the coupling members 6a and 6b engaged with each other and the joint between each of the conductor connecting members 8 and each of the coupling members 6a and 6b and the conductor 2 is several t or more. In contrast to ten and several t, the tensile load for confirmation required to confirm the engagement between the pair of coupling members 6a and 6b is several kg.
Or about several tens of kilograms is sufficient. Therefore, by confirming whether or not the pair of coupling members 6a and 6b are securely engaged with each other, the coupling member 6 engaged with each other is confirmed.
a, 6b and the joint between the conductor connecting members 8, 8 and the coupling members 6a, 6b and the conductor 2 are not damaged.

The other cable support table 22b
The force applied to the one cable support table 22a by the feed screw mechanism including the nut piece 24a and the threaded rod 30a in order to retract the one cable support table 22a from the first cable support table 22a.
Power cable 1 with its tip 1a supported and fixed on the upper surface of
Therefore, it is necessary to be larger than the reaction force applied to the one cable support table 22a. That is, FIG.
As is clear from the description of FIG.
In order to keep the tip 1a away from the tip 1a of another power cable 1 to which the tip 1a is to be connected, it is necessary to overcome a reaction force of about 1t. In other words, 1
The reaction force applied to the distal ends 1a, 1a of the pair of power cables 1, 1 acts in a direction to bring the pair of coupling members 6a, 6b closer to each other. However, when the work of checking the connection state between the pair of coupling members 6a and 6b is performed, the distal end portion 1a of the another power cable 1 is supported and fixed. The reaction force does not act in a direction in which the pair of coupling members 6a and 6b approach each other. Therefore, in order to retreat one cable support table 22a from the other cable support table 22b in order to confirm the connection state between the two coupling members 6a and 6b, the one cable support table 22a is attached to the one cable support table 22a. It is necessary to add a force obtained by adding the above-mentioned confirmation tensile load to the reaction force.

On the other hand, the confirmation tensile load is much smaller than the reaction force. Therefore, the one cable support table 2 is simply moved from the other cable support table 22b.
It is conceivable that the retraction of 2a alone makes it difficult to perform the confirmation work because the confirmation pulling load is hidden by the reaction force. On the other hand, if the assembling apparatus of the power cable connecting portion of the present invention is used, the above-described FIGS.
As shown in (H), the above 1 is placed inside the insulating block 9.
In the process of inserting the pair of coupling members 6a, 6b, the reaction force can be accurately measured by the load cell 43. That is, for example, from the state of FIG. 8 (A) to the state of FIG. 8 (B), the distal end portions 1a, 1b of the pair of power cables 1, 1
Are moved (moved away from each other), the cable support table 22 that supports and fixes these tips 1a, 1a
a, 22b must be moved against the reaction force of the respective power cables 1,1. At this time, the load cell 43 is strongly clamped between one axial end surface of the nut piece 24a and the inner surface of the holding bracket 42 with a force corresponding to the reaction force. Therefore, in this case, the load cell 43
Is recorded (written on paper or the like or stored in a controller of an electric motor for driving the screw rod 30a).

Then, in a state where the assembling work of the connection portion for the power cable has progressed to the state shown in FIG. 8H, the measured value of the load cell 43 showing the reaction force is larger by the checking tensile load. By force, the one cable supporting table 22a is connected to the other cable supporting table 22a.
b. In this way, regardless of the presence of the reaction force, the load is much larger than the tensile load for confirmation, and varies greatly due to a difference in the arrangement state based on a difference in the offset amount of the end portion 1a of the power cable 1. , The pair of coupling members 6
By applying a necessary and sufficient confirming tensile load to the engaging portion between the tip portions a and 6b, it is possible to reliably determine whether the engaging state of the engaging portion is appropriate. The load cell 43
May be assembled to both the axial displacement means of the pair of cable supporting tables 22a and 22b, but it is sufficient to assemble only one of the cable supporting tables 22a to the axial moving means.

Next, FIG. 2 shows a second embodiment of the present invention.
An example is shown. In this example, the holding bracket 42a holding the nut piece 24b screwed with the screw rod 30a and the cable support table 22a can be freely connected by the pulling rod 45. A load cell 43a for measuring the load in the pulling direction is provided in the middle of the pulling rod 45 so that the load in the pulling direction applied to the pulling rod 45 can be measured. However, both ends of the pulling rod 45 are detachably attached to the holding bracket 42a and the cable support table 22a by bolts or the like.

In the case of the present embodiment, when assembling the connection portion for the power cable, the cable support table 22a is used.
The cable support table 22a is moved in the axial direction of the distal end portion 1a of the cable 1 based on a screw engagement between a nut piece 24a supported by another holding bracket (not shown) fixed to the lower surface of the cable 1 by a bolt and a screw rod 30a. . On the other hand, the assembling work of the connection portion for the power cable is shown in FIG.
Then, the other holding bracket is removed from the lower surface of the cable support table 22a, and both ends of the pulling rod 45 are connected to the holding bracket 42a and the cable support table 22a by bolts or the like. I do. By rotating the screw rod 30a, the cable support table 22a tends to move away from another cable support table,
As in the case of the first example described above, it is determined whether or not the pair of coupling members are securely engaged with each other. In the case of this example, the assembly device can be reduced in cost because the load cell 43a is used for the tensile load which is inexpensive compared to the compression load. Further, repair / replacement work when the load cell 43a is damaged can be easily performed.

When the present embodiment is carried out, the nut piece 24b for pulling the pulling rod 45 and the holding bracket 42a are provided with the nut piece 24a for displacing the cable support table 22a in the axial direction of the power cable 1. It may be shared with the holding bracket. In the case of common use, the holding bracket is detached from the cable support table 22a in a state where the assembling work of the power cable connecting portion is advanced to the state of FIG. 8H, and the screw rod 30a is rotated. FIG. 2 shows the nut piece 24a and the holding bracket.
To the position.

Further, in order to carry out the present invention, three tables 21, 22a, 22b (see FIGS. 5, 6, 8) are provided with a pair of power cables 1, 1 at the end portions 1a, 1a and an insulating block. 9 and the two end portions 1
It is sufficient that the pair of conductor connecting members 8, 8 and coupling members 6a, 6b fixed to a, 1a can be moved from the openings at both ends of the insulating block 9 in a direction in which it can be inserted into the insulating block 9. A pair of power cables 1, 1
In order to match the central axes of the insulating block 9 and the insulating block 9, at least two of the insulating block supporting table 21 and the pair of cable supporting tables 22a and 22b are connected to the pair of power cables. 1,
It suffices to be able to move in the direction perpendicular to the central axis of the front end portions 1a, 1a and the insulating block 9. In this case, the vertical position of the center axis of each member can be matched in advance, so it is sufficient if the horizontal position can be matched.
In order to insert the pair of conductor connection members 8, 8 and the coupling members 6a, 6b into the insulating block 9 from both ends of the insulating block 9, the insulating block support table 21 and the pair of insulating blocks 9 are required. Cable support table 2
At least two of the support tables 2a and 22b are connected to the end portions 1a and 1a of the pair of power cables 1 and 1, respectively.
It suffices to be able to move in the direction of the central axis with respect to the insulating block 9. However, if a structure as shown in FIGS.
It is not necessary to largely move only the distal end portion 1a of one power cable 1 of the pair of power cables 1 and 1, the reaction force is kept small, and the assembling work of the power cable connecting portion is relatively easily performed. I can do it.

[0041]

The method and apparatus for assembling the connection portion for a power cable according to the present invention are constructed and operated as described above, so that the coupling members can be securely connected to each other without imposing an excessive burden on the operator. It can be determined whether or not they are engaged.
For this reason, it is possible to obtain a highly reliable power cable connection part with less stress on the operator.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional schematic side view showing a first example of an embodiment of the present invention.

FIG. 2 is a partial vertical sectional side view showing the second example.

FIG. 3 is a cross-sectional view illustrating an example of a power cable connecting portion.

FIG. 4 is a partial cross-sectional view sequentially showing an assembly process of a power cable connecting portion.

FIG. 5 is a plan view of a conventionally known power cable connecting portion assembling apparatus.

FIG. 6 is a side view of the same.

FIG. 7 is a schematic plan view showing an arrangement state of a power cable near a connection portion.

FIG. 8 is a plan view sequentially showing a process of assembling the power cable connecting portion using the above-described conventionally known assembling apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power cable 1a Tip 2 Conductor 3 Corrugated outer layer 4 Semi-conductive layer 5 Insulator 6a, 6b Coupling member 7 Conical surface 8 Conductor connecting member 9 Insulation block 10 Conductor contact member 11 Reinforced insulating layer 12 Semi-conductive layer 13 Center hole 14 Waterproof admixture 15 Protective cylinder 16 Insulating cylinder 17 Waterproof layer 18 Assembly device 19 Fixing jig 20 Fixed frame 21 Insulating block support table 22a, 22b Cable support table 23 Guide rail 24, 24a, 24b Nut piece 25 Screw rod 26 Drive shaft 27 First axial feed handle 28a, 28b Axial slide 29a, 29b Guide rail 30a, 30b Screw rod 31a, 31b Drive shaft 32 Second axial feed handle 33 Third axial feed handle 34a, 34b Guide rail 35a, 35b screw rod 36a, 6b Nut piece 37 First width direction feed handle 38 Second width direction feed handle 39 Cable holding jig 40 Block holding jig 41 Clamp fitting 42, 42a Holding bracket 43, 43a Load cell 44 Through hole 45 Pulling rod 46 High pressure shield electrode

Continued on the front page (72) Inventor Iwao Odaka 1008 Shinbori, Kumagaya-shi, Saitama

Claims (2)

[Claims] An end of a pair of power cables to be connected is removed by connecting the ends of the power cables each having a conductor covered with an insulator. After exposing the conductors from above, a coupling member for connecting the two conductors is fixed to the tip of each of the conductors, and then the two conductors are aligned with the center axes of the two conductors aligned with each other. The couplings fixed to the distal ends of these two conductors by bringing them closer to each other are engaged with each other inside the insulating block formed in a cylindrical shape, and a connection portion for the power cable connecting these two conductors is formed. In the assembling method, after the coupling members are engaged with each other, at least one cable support of a pair of cable support tables supporting and fixing ends of the pair of power cables. For the table, a force that is sufficiently smaller than the force that leads to the destruction of the coupling member,
The pair of cable support tables are applied in a direction away from each other, and based on the magnitude of this force and the presence or absence of displacement of the one cable support table, it is confirmed that the coupling members are engaged with each other. A method for assembling a connection portion for a power cable, comprising: 2. A pair of cable support tables capable of supporting and fixing the ends of a pair of power cables to be connected to each other on the upper surface thereof, and a pair of cable support tables around the connection between the ends of the pair of power cables. An insulating block support table capable of supporting and fixing an insulating block to be fitted on the upper surface thereof, and at least two of the insulating block support table and the pair of cable support tables; And a center axis matching unit that moves the pair of power cables and the insulating block so that the center axes of the pair of power cables and the insulating block coincide with each other by moving the insulating block in a direction perpendicular to the center axis of the insulating block. A central axis of the pair of power cables and the insulating block; A pair of coupling members fixed to the ends of the conductors exposed from the ends of the insulators constituting the pair of power cables by being moved in the directions are freely inserted into the inside of the insulating block. In an apparatus for assembling a connection portion for a power cable having a moving means,
A cable supporting table moved in the axial direction of the power cable by the axial moving means and a driving means for moving the cable supporting table in the axial direction of the power cable. A power cable connecting part assembling device, further comprising a load detecting means for detecting a driving force applied to the support table in the axial direction of the power cable.