JPH10126910A - Gas insulated apparatus conductor supporting jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the deformation of the end of the sheath of a conduit gas insulated cable and facilitate the installation of the cable by a method wherein band pieces are closely linked with each other to tighten the inner pipe of the cable and, further, shoe pieces are pressed against the outer pipe of the cable by using the band pieces as fulcrums. SOLUTION: A conductor supporting jig 21 has two divided band pieces 3 between which an aluminum conductor 2 is held and two shoe pieces 4 which have areas large enough to cover the inner surface of a sheath 1. Flange surfaces are provided on the band pieces 3 and the shoe pieces 4 respectively and the respective flange surfaces are brought into contact with each other. Long holes 9 are formed in the flanges of the shoe pieces 4 and screw holes 23 are formed in the flanges of the band pieces 3. After the conductor supporting jig 21 is inserted into the end of the conduit gas insulated cable, first, nuts 18 are screwed onto bolts 16 to fix the band pieces 3 to the aluminum conductor 2. Then, after bolts 6 are turned to press the shoe pieces 4 against the sheath 1 through bolt caps 7 provided on the band pieces 3, bolts 10 are tightened to fix the band pieces 3 and the shoe pieces 4 to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulating device having an inner pipe (conductor) inserted into an outer pipe (sheath), for example, a conductor supporting jig used for transporting a conduit air cable. is there.

[0002]

2. Description of the Related Art First, a typical single-core conduit air cable is generally shown in FIG.
This will be described with reference to FIG. The single-core conduit air cable 101
An inner pipe 2 (hereinafter referred to as an aluminum conductor 2) is supported by a fixed columnar spacer 31 and a movable columnar spacer 32 made of a thermosetting resin in an aluminum outer pipe 1 (hereinafter referred to as a sheath 1). The sheath 1 is pressurized and sealed with an SF6 gas 35 which is an insulating gas.

[0003] A pipe air cable 101 having a basic length of 14 m is manufactured (assembled) at a factory and transported to a laying site. At the installation site, a plurality of pipeline air cables 101 are connected to each other to form a line. One end 102 of the sheath 1 of the conduit air cable 101 is formed into an expanded shape, and the other end 103 is formed into an expanded shape at a position slightly inside the terminal for connection and use. One sheath end 1
02 and the sheath end 103 of the adjacent conduit air cable 101
After fitting, they are connected by welding. The connection of the aluminum conductor 2 includes a plug-in long contact 33 having a sliding portion for absorbing thermal expansion and contraction of the aluminum conductor 2 and a connection error, and a plug-in short contact 34 provided at an end of the adjacent aluminum conductor 2. Are fitted and mechanically connected.

As shown in FIG. 3, a conductor support jig 21 used only during transportation is attached to sheath ends 102 and 103 of this type of insulating equipment. The conductor supporting jig 21 is a spacer 31 provided in the conduit air cable 101.
A jig for supporting the weight of the conductor at the terminal portions 102 and 103 together with the terminal portions 32 and 32, suppressing acceleration force and vibration during transportation, preventing the aluminum conductor 2 from moving, and preventing damage and deformation.

[0005] As shown in FIG. 4, a conventional conductor supporting jig 21 sandwiches an aluminum conductor 2 between band pieces 3, and three places at equal intervals on the outer periphery of the band piece 3 with respect to the outer surface of the band piece 3. The aluminum conductor 2 is supported by pushing a not-so-wide wide holding member 41 toward the sheath 1 side in the radial direction via a bolt 40 attached so as to be vertical.
The insertion portion of the bolt 40 provided on the holding member 41 is a through hole 44 into which the tip of the bolt 40 can be inserted. The nut 42 hits the insertion end of the through hole 44, and the holding member 41 advances and retreats by rotating the nut 42. It has a structure.

More specifically, the band pieces 3, 3 divided into two pieces are attached so as to sandwich the aluminum conductor 2 in a state where the through holes 44 of the holding metal fittings 41 are attached to the tips of the bolts 40 provided on the band piece 3. It is fixed to the aluminum conductor 2 by bolts 43,43. Next, the holding member 41 is pushed toward the sheath 1 by rotating the nut 42 toward the sheath 1, and the holding member 4 is further rotated by rotating the nut 42.
1 is pressed against the inner surface of the sheath 1 to fix the aluminum conductor 2 to the sheath 1.

[0007]

However, the conductor supporting jig 21 is provided on the inner surface of the sheath 1 with the holding metal 41.
Is pressed one by one, there is no reference to keep the arc, and when the nut 42 is tightened, it is not evenly tightened and the surface pressure at one place becomes large. Therefore, as shown in FIG. The shape may be deformed into a triangular shape. If the true circle of the sheath 1 near the sheath end is deformed, it becomes impossible or insufficient to insert the sheath between the conduit cables 101, and it is likely that welding connection becomes impossible or welding defects occur. In addition, when the conductor supporting jig 21 is assembled to support the aluminum conductor 2 because the bolt 40 and the holding metal 41 are not mechanically connected to each other, these may come off or fall apart. There is also a problem in workability, such as becoming inconvenient.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and can suppress deformation of the sheath end portion 102 or 103 of the conduit air cable 101 (equivalent gas insulating device), and also facilitates installation work. It is an object of the present invention to provide a conductor supporting jig that can be manufactured in a simple manner.

According to the first aspect of the present invention, each of N pieces of band pieces to be fastened to the inner surface of the outer pipe and N pieces of shoe pieces to be pressed to the inner surface of the outer pipe of the gas-insulated equipment having the inner pipe inserted into the outer pipe. The band pieces are attached and detachably connected to each other, and the shoe pieces are displaced so that joints of the shoe pieces are located near the center of the band pieces. The pieces are provided with flanges that are in contact with each other, and the flange surfaces are connected so that they can be slidably moved and fixed so as to form an annular shape.When the band pieces are connected to each other, the inner pipe is closed. Gas insulated equipment, characterized in that it has a tightening structure and further has a mechanism that presses a shoe piece against an outer pipe with a band piece as a fulcrum. A supporting jig.

[0010] The invention according to claim 2 is that the present invention provides a gas insulating device having an inner pipe inserted into an outer pipe, and N pieces each of which is attached to the outer surface of the inner pipe by tightening the band piece by pressing the inner pipe to the inner surface of the outer pipe. The band pieces are attached and detachably connected to each other, and the shoe pieces are displaced so that joints of the shoe pieces are located near the center of the band pieces. The pieces are provided with flanges that are in contact with each other, and the band piece flanges and the shoe piece flanges are individually associated with each other and connected so as to be slidable and movable and fixed at one place. And a mechanism for pressing the outer pipe against the outer pipe.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a conductor supporting jig according to the first aspect of the present invention will be described with reference to FIG. As shown in FIG. 1, the conductor supporting jig 21 of the present invention
Band piece 3 divided into N pieces (two in the drawing) sandwiching
And N pieces (two pieces in the drawing) of a sufficiently large size to cover the inner surface of the sheath 1 are shown.
Are shifted from each other by 180 / N degrees (90 degrees in the drawing) so that the joints are located at the center. A flange is provided on both the band piece 3 and the show piece 4. Two long holes 9 are provided on the show piece 4 side flange, and a screw hole 23 is formed in the band piece 3 side flange. It is configured to be tightened with. There is also a large play on the slot. Band piece 3
And the shoe piece 4 are connected by a bolt 10 on one side, another band piece 3 is connected by another bolt 10 on the same shoe piece 4, and then the next shoe piece 4 is connected to the band piece 3 and so on. Then, only the bolt 10 forms a loop of the entire conductor supporting jig. If this bolt 10 is loosely tightened, the gap of the shoe piece 4 can be adjusted manually, and if the bolt 10 is tightened,
The shoe piece 4 and the band piece 3 are fixed. The longitudinal direction of the elongated hole 9 is a radial direction, and is preferably the direction of the split of the band piece 3 at the center of the show piece 4. The play in the width direction is designed to sufficiently cope with the amount of misalignment between the sheath and the conductor. When the bolt 16 connecting the band pieces 3 is tightened, the band piece 3 becomes the aluminum conductor 2
Tighten. Further, an appropriate number of push bolts 6 are screwed into the screw holes 24 provided on the flanges of the screw pieces 4 on the screw pieces 4, and the band pieces 3 are turned through the bolt caps 7 at the tips by rotating the bolts 6. The distance between the metal piece and the piece 4 is enlarged so that the piece 4 is pressed outward, that is, the piece 4 is pressed inside the sheath 1.

The order of assembling the embodiment of the conductor supporting jig of the present invention shown in FIG. 1 will be described. All the band pieces 3 and the show pieces 4 are connected to each other in a ring shape by the bolts 10 in the elongated holes 9 described above. The bolt 10 is positioned inside (in the conductor direction) inside the elongated hole 9, the pieces 4 are approached and adjusted, and the band pieces 3 are separated and adjusted (remove one bolt 10 and cut the ring) May be used).

[0013] A conductor support fitting 21 loosely connected in a ring shape is inserted into an end of the conduit air cable 101, and first, a nut 18 is fastened to a bolt 16 to fix the band pieces 3, 3 to the aluminum conductor 2. Next, hand pieces 4
And attach the piece 4 to the sheath 1
After slightly tightening the bolts 6 and confirming that the tips of all the bolts 6 have reached the band pieces 3 via the bolt caps 7 provided on the band pieces 3, tighten the bolts 6 in the direction of pressing against the sheath 1. It moves and presses the piece 4 against the sheath 1.
Finally, the bolt 10 is completely tightened to fix the band piece 3 and the shoe piece 4 to complete the mounting operation.

An embodiment of the present invention according to claim 2 will be described next with reference to FIG. The difference between FIG. 1 and FIG. 2 is that in FIG. 2, the attachment by the elongated hole 9 is reduced by one, and the connection role is changed to the bolt 16, the nut 18 and the through bolt 6 holding the band piece 3. This is possible at 2 to 4 where N is small. FIG. 2 shows a structure where N = 2. As shown in FIG. 2, the conductor supporting jig 21 of the present invention includes a band piece 3 divided into two pieces sandwiching an aluminum conductor 2 and two pieces 4 of a sufficient size to cover the inner surface of the sheath 1. The band pieces 3 are connected to each other by bolts 16 and nuts 18. The pieces 4 are shifted by 90 degrees so that the seam is located at the center of the band 3. A flange is provided on both the band piece 3 and the show piece 4, and a long hole 9 is provided on the flange on the show piece 4, and a screw hole 23 is formed in the flange on the band piece 3, and tightened with the bolt 10. It is configured to be. If the bolt 10 is loosened, the gap of the shoe piece 4 can be adjusted manually, and if the bolt 10 is tightened, the shoe piece 4 and the band piece 3 are fixed. This portion corresponds to a movable connecting portion. Only one shoe piece 4 is combined with one band piece 3, and a plurality of elongated holes 9 of the guide portion may be provided in the same combination in the same direction. The direction of the slot 9 is desirably the split direction of the band piece 3 at the center of the show piece 4. Then, at least one or more appropriate number of push bolts 6 are screwed into the screw holes 24 of the bolt mounting portions 8 provided on the flanges of the screw pieces 4 on the screw pieces 4,
Is rotated to increase the distance between the band piece 3 and the show piece 4 via the bolt cap 7 at the tip, thereby increasing the show piece 4
To the outside, that is, to insert the piece 4 into the sheath 1
It is designed to be pressed inside.

The order of assembling the embodiment of the conductor supporting jig of the present invention shown in FIG. 2 will be described. Band piece 3 divided into two
By loosely connecting them with bolts 16 and nuts 18, a loop of the band piece 3 and the shoe piece 4 is formed. Then, the bolt 4 is screwed into the screw hole 23 of the flange of the band piece 3 through the elongated hole 9 so as to temporarily connect the mesh piece 4 and the band piece 3 so that the joint of the piece 4 is located near the center of the band piece 3. I do. The bolt 10 is positioned inside (in the direction of the conductor) inside the elongated hole 9, and the screw pieces 4 approach each other and are lightly tightened.
At this time, the bolt 6 is screwed into the helical hole 24 of the bolt attachment portion 8 provided on the shoe piece 4. At this time, the insertion length of the bolt 6 is made short so that a gap is formed between the band piece 3 and the tip of the bolt 6.

In this state, since no part is fixed, the band pieces 3 are spread by hand, while the position of the bolt 10 in the elongated hole 9 is set to the inside (conductor direction) as much as possible.
Lightly tighten 0. In this way, the inner band piece 3 has a larger diameter and the outer shoe piece 4 has a smaller diameter.
With the bolt 10 as a fulcrum, the shoe piece 4 is stabilized while being supported by the bolt 6 (the bolt marked D in the figure) which is balanced by contacting the band piece 3 side of the bolt 6. deep. The conductor support jig 21 is inserted into the end of the conduit air cable 101, and the bolt 16
The band pieces 3 are fixed to the aluminum conductor 2 by tightening the nuts 18. Next, the screw 4 is enlarged by hand, the screw 4 is attached to the sheath 1, the bolt 10 is slightly tightened, the bolt 6 is turned, and the tip of the bolt 6 is passed through the bolt cap 7 provided on the band 3. After confirming that the piece 3 has been reached, the bolt 6 is moved in the direction of pressing against the sheath 1, and the shower piece 4 is pressed against the sheath 1. Finally bolt 1
0 is completely tightened to fix the band piece 3 and the show piece 4 to complete the mounting operation.

It is desirable that the conductor supporting jig of the present invention be made of a non-metal in order to mix electrically harmful foreign substances into the gas insulating apparatus or to prevent the generation of foreign substances. Bolts and nuts are made of thermosetting resin, and cushions 13, 14, 20 and urethane washers 2 made entirely of rubber are provided at the contact portions with metal.
3 and a washer 17 to which a cushion made of rubber is adhered, and a collar 22 made of plastic.

In this embodiment, the band piece 3 and the show piece 4
The example of dividing into individual pieces has been described. However, when the size of the gas insulating device is increased, the assembly is facilitated by dividing into three parts, four parts, etc. (N divisions), and the pressure on the inner surface of the sheath 1 by the shower pieces 4 is made more uniform over the entire surface. And the deformation of the sheath 1 can be further prevented.

[0019]

As described above, according to the first aspect of the present invention,
According to the conductor support 21 of the present invention, the connection of the bolts of the elongated holes 9 turns the shower pieces 4 and the band pieces 3 into a loop, so that they are all integrated, so that the handling is easy and the transport during handling is easy. In addition, there is no need for any special processing, and there is no portion where the bolts and the holding metal, which are the conventional problems, come off. Further, since the shoe piece 4 can be concentrically enlarged and reduced at the position of the elongated hole, the sheath 1 can be uniformly tightened,
The deformation of the sheath 1 can be suppressed. Since the band piece 3 and the show piece 4 are combined and integrated, when the conductor support 21 is assembled and the conductor 2 is supported, one-person work is possible. Since the band piece 3 and the shoe piece 4 have a flange structure, they are structurally strong and do not deform. According to the second aspect of the present invention, it is possible to omit the processing of the long hole by half.
However, there is a defect that handling precautions increase during transportation and installation.

[Brief description of the drawings]

FIG. 1A is an end view showing an example of the structure of the conductor supporting jig according to the first aspect of the present invention, and FIG.
FIG. 4 is a sectional view taken along line -Y.

FIG. 2 (a) is an end view showing an example of the structure of the conductor supporting jig according to the invention of claim 2, and FIG. 2 (b) is Y in FIG.
FIG. 4 is a sectional view taken along line -Y.

FIG. 3 is an explanatory view showing a state where a conductor supporting jig is attached to a standard conduit air cable.

FIG. 4 is an assembly view showing an example of a conventional conductor supporting jig.

FIG. 5 is an explanatory view showing a deformed state at the time of tightening of a conventional conductor supporting fitting.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheath 2 aluminum conductor 3 band piece 4 shoe piece 6 bolt 8 bolt mounting part 9 long hole 10 bolt 11 contact part with inner surface of sheath 16 bolt 21 conductor support jig 101 conduit air cable 102 sheath end 103 sheath end

Claims (2)

[Claims] 1. A band piece which is fastened to an outer surface of an inner pipe of a gas insulating device having an inner pipe inserted into an outer pipe, and a shoe piece which is mounted by pressing against an inner surface of an outer pipe are divided into N pieces. The band pieces are detachably connected to each other, and the shoe pieces are displaced so that a joint of the shoe pieces is located near the center of the band pieces, and the band pieces and the shoe pieces are in contact with each other. A flange is provided, and the flange surfaces are connected to each other so that the flange surfaces can be slidably moved and fixed so as to be annular, and the inner pipe is tightened when the band pieces are connected and approached to each other. A conductor supporting jig for a gas-insulated device, comprising a mechanism for pressing a shoe piece against an outer pipe with a band piece as a fulcrum. 2. A band piece which is fastened to an outer surface of an inner pipe of a gas insulation device having an inner pipe inserted into an outer pipe, and a shoe piece which is mounted by pressing against an inner surface of an outer pipe, are divided into N pieces. The band pieces are detachably connected to each other, and the shoe pieces are displaced so that a joint of the shoe pieces is located near the center of the band pieces, and the band pieces and the shoe pieces are in contact with each other. The band piece flange and the show piece flange are individually associated with each other so that they can be slid and moved and fixed in one place, and the show piece is attached to the outer pipe with the band piece as a fulcrum. A conductor supporting jig for gas-insulated equipment, comprising a pressing mechanism.