JPH08256413A - Power cable connection support base - Google Patents

Abstract

PURPOSE: To perform correction by providing a support stand having at least one cable holding tool for every connected cable on a base having rigidity to reduce the use of a lever block or a chain block. CONSTITUTION: A base 11 is placed on the lower side of a power cable C, and a sheath part C1 is held by the cable holding tools 29A, 29D of support stands 27A, 27D at both ends. Also, an insulating body part C2 is held by the cable holding tools 29B, 29C of support stands 27B, 27C on the inside thereof. Further, a conductor connection part C3 is held by the cable holding tool 64 of a central support stand 63, and tension is applied thereto by a lever block 77. Therefore, the cable holding tools 29A, 29C and 29B, 29D are moved in front and rear, thereby being able to correct bending. As a result, since a lever block or a chain block is not used in the vicinity of the central part of a connection part, there is not possibility that a foreign material gets mixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power cable connecting support used for supporting, straightening (straightening) a power cable when connecting the power cable.

[0002]

2. Description of the Related Art When connecting a power cable, it is required that the connecting portion of the power cable be linear. The electric power cable is wound around a drum and is generally transported and stored, so that the electric power cable has a curl. At the connection site, the power cable is heated and straightening is performed to remove this curl. This straightening process causes the power cable to be in a straight state for the time being, but the bending tends to be restored by subsequent heating or aging. For this reason, the linearity is checked every time the connecting work is performed, and if a bend is generated, it is corrected. In order to correct the bend of the power cable, it is necessary to apply bending stress or tensile stress to the cable. Conventionally, lever blocks and chain blocks have been used to apply force to cables.

[0003]

When connecting a power cable, particularly an ultra-high voltage power cable, it is necessary to eliminate minute foreign substances that have a great influence on the insulation performance of the connection portion.
Conventionally, the lever block and chain block used for straightening cables are installed above the cable connection part, and because metal parts come into contact with each other during use, foreign matter is likely to occur due to wear, and the foreign matter is generated at the connection part. It may fall into the vicinity and fall into the connection part.

Further, in the lever block and the chain block, it is necessary to apply the reaction force of the stress applied to the cable to the wall or ceiling such as a winding road. Therefore, the conventional straightening method has a problem that a large number of lever blocks and chain blocks are stretched between the cable and the wall or ceiling, which hinders the connection work.

One object of the present invention is to minimize the use of lever blocks and chain blocks when straightening cables. Another object of the present invention is to make it possible to straighten a cable without using a lever block or a chain block particularly in the vicinity of the central portion of a connection portion where a problem of foreign matter mixing is likely to occur. Still another object of the present invention is to prevent the cable from being subjected to an unreasonable force other than the force required for straightening.

[0006]

SUMMARY OF THE INVENTION The present invention provides a support base for connecting a power cable to achieve the above-mentioned object, the structure of which is such that each cable to be connected is mounted on a rigid base. At least one support stand having a cable gripping tool is provided in each of the above-mentioned units (Claim 1).

In this power cable connecting support, a pedestal is installed on the lower side of the cable connecting portion, and the cables on both sides of the central portion of the connecting portion are gripped by the cable gripping tool of the support stand provided thereon.

When there is one support stand on each side of the center of the gantry, the fulcrum of the cable to be straightened is determined by the gantry having rigidity and the support stand supporting the cable on the gantry. It is possible to perform straightening by using less lever blocks and chain blocks.

When there are two or more support stands for one cable, the bending of the cable can be prevented by adjusting the position of the rigid stand and the support stand for supporting the cable on the stand. It is possible to correct it, and it is possible to significantly reduce or eliminate the use of the lever block and the chain block as compared with the conventional one.

Further, the power cable connecting support base of the present invention is preferably configured such that a central support stand having a cable gripping tool is provided between the support stands so as to be removable or movable to the retracted position. (Claim 2).

With this configuration, the cable can be corrected by supporting the cables by the central support stand on the pedestal having rigidity and the support stands on both sides thereof and adjusting their positions, In particular, it is possible to eliminate or significantly reduce the use of the lever block and the chain block near the central portion of the connection portion where the problem of foreign matter mixing is likely to occur. If the center support stand is detachable from the stand or movable to the retracted position, it is possible to install a mold for insulator molding in the center of the stand after the correction work is completed, which improves workability. .

Further, in the power cable connecting support of the present invention, it is preferable that the cable gripping tool is rotatable about the rising direction of the support stand as the rotation center axis. By doing so, even if the direction of the grip portion of the power cable changes due to the correction, the cable grip tool can grip the power cable in a state in which the power cable faces the same direction as the power cable, so that the power cable is not damaged. Less likely to give.

Further, in the power cable connecting support base of the present invention, it is preferable that the support stand has a mechanism for moving the cable gripping tool in the cable cross-section direction (claim 4). With this configuration, the bending of the cable can be corrected by moving the cable gripping tool within the cross section of the cable while the cable gripping tool grips the cable. This is effective in reducing the use of lever blocks and chain blocks.

Further, in the power cable connecting support base of the present invention, it is preferable that the support stand is movable in the longitudinal direction of the frame (claim 5). In this way, the extension of the cable due to the correction of the bending of the cable can be absorbed by the escape of the support stand in the longitudinal direction, so that the cable is not overloaded and the force required for the correction is small.

Further, it is preferable that the power cable connecting support of the present invention has a structure in which an arm which can be fixed to a stand or a metal fitting in a manhole is provided on the frame. If such an arm is provided, the position of the gantry is fixed, so when moving the support stand toward or away from the upright, it is possible to prevent the gantry from becoming unstable, and correct the cables. It will be easier. Further, it is preferable to provide the arm on the back side of the gantry since it does not interfere with the work on the front side of the gantry.

[0016]

【Example】

[Embodiment 1] FIGS. 1 to 13 show an embodiment of the present invention. FIG. 1 is a rear view showing the entire power cable connecting support base of the present embodiment, FIG. 2 is a plan view thereof, and FIG. 3 is a side view thereof. In the figure, 11 is a pedestal made of steel or aluminum alloy and having rigidity, 13 is a leg attached to the lower surface of the pedestal 11, and 15 is an arm attached to extend to the back surface of the pedestal 11.

The pedestal 11 is elongated in the cable direction and has a length sufficient to support the cable at the connecting portion. The leg 13 sets the height of the pedestal 11, and the height can be adjusted by the screw at the lower end. Arm 15
Is for setting the position of the gantry 11 in the front-rear direction, and has a mounting member 17 at its tip. The fitting 17 is attached to a metal stand 21 that is fixed to a wall 19 of a runway or manhole. As shown in FIGS. 4 (a) and 4 (b), the mounting bracket 17 includes the bolt nut 2
Although it is fastened and fixed to the metal plate 21 by means of 3, the bolt holes are elongated holes 25 so that the mounting position can be adjusted in the vertical direction.

On the pedestal 11, two support stands 27A to 27D are installed on each side of the central portion in the longitudinal direction for each cable to be connected. Each support stand 27
A to 27D are cable grippers 29A to 2 at the upper end, respectively.
It has 9D. In addition, each support stand 27A to 27D
Are mounted on the left and right guide rails 31 fixed to the upper surface of the gantry 11, so that they can be freely moved in the left-right direction (the longitudinal direction of the gantry, that is, the longitudinal direction of the cable) in FIG. There is.

The respective support stands 27A to 27D have the same structure. Details of the structure are shown in FIGS. 5 and 6. As shown in FIG. 6, the cable gripper 29 on the upper end of the support stand 27 is composed of a pair of upper and lower cleats 33 a and 33 b and a cover 35. The lower cleat 33b is fixed on the table 37, and the upper cleat 33a is detachably attached by fixing the cover 35 on the table 37 with a screw 39.

The table 37 is installed at the upper end of the female screw cylinder 41. A flange 43 is provided on the outer periphery of the upper end of the female screw cylinder 41.
Are formed. The table 37 is rotatably fitted to the flange 43, and an annular plate 45 attached to the lower end surface of the table 37 prevents the table 37 from coming off the flange 43. Thereby, the cable gripper 29 can freely rotate with respect to the female screw cylinder 41 about the axis of the female screw cylinder 41.

On the outer periphery of the lower part of the female screw cylinder 41, the female screw cylinder 4
A lever 47 for rotating 1 is provided in four directions. A male screw column 49 is screwed into the female screw cylinder 41. The male screw column 49 is vertically fixed on the front-rear moving plate 51. Therefore, when the female screw cylinder 41 is rotated by the lever 47, the female screw cylinder 41 and the cable gripping tool 29 move up and down with respect to the front-rear moving plate 51.

The front-rear moving board 51 is installed on the front-rear guide rail 53 as shown in FIG. 5 and is movable in the front-rear direction. The front and rear guide rails 53 are fixed on the left and right moving plate 55. A male screw rod 57 is provided in parallel with the front and rear guide rails 53 between the two front and rear guide rails 53 on the left and right moving board 55. Both ends of this male screw rod 57 are shown in FIG.
As shown in FIG. 7, a handle 59 for rotatably supporting the left and right moving plate 55 via a bearing and for rotating the male screw rod 57 is attached to the front end thereof. On the other hand, a female screw block 61 that is screwed to the male screw rod 57 is fixed to the lower surface of the front-rear moving plate 55.

Therefore, the handle 59 causes the male screw rod 5 to
When 7 is rotated, the front-rear moving plate 55 is guided by the front-rear guide rail 53 and moves in the front-rear direction. As a result, the cable gripper 29A moves in the front-rear direction. If necessary, the front-rear moving board 51 may be provided with a stopper mechanism for preventing the front-rear moving board 51 from moving in the front-rear direction or a brake mechanism for preventing the front-rear moving board 51 from moving unless a force of a predetermined value or more is applied.

The left and right moving board 55 is installed on the left and right guide rails 31 described above, and is freely movable in the left and right direction (cable direction). As a result, the cable gripper 29 can also move in the left-right direction. In addition, the left and right moving board 55,
A stopper mechanism for preventing this from moving in the left-right direction or a brake mechanism for restricting not to move unless a force of a predetermined value or more is applied may be provided.

With the above configuration, the cable gripper 29
Is rotatable about the vertical axis of the support stand 27, and the vertical and longitudinal positions can be adjusted (positional adjustment in the cable cross section), and can also be freely moved in the horizontal direction. is there.

Referring again to FIGS. 1 and 2, the pedestal 1
The right half of the center support stand 63 and the left half of the molding die 65 are shown in the center of 1. This is a stand 1
1 shows that the central support stand 63 may be installed and the mold 65 may be installed in the central part of the No. 1.
The center support stand 63 is used to correct the bending of the cable, and the mold 65 is used to mold the connecting portion insulator.

The central support stand 63 has a cable grip 64 at the upper end. The structure of the central support stand 63 is similar to that of the support stand 27 shown in FIGS. 5 and 6, and thus detailed description thereof will be omitted. The central support stand 63 is detachably attached to the gantry 11 with bolts and nuts or the like (may be attached so as to be retractable upward or backward).

A cable position measuring stand 67 is installed between the central supporting stand 63 and the supporting stands 27B and 27C on both sides thereof. 1 and 2, this measuring stand 67 is shown only on the right side of the central support stand 63, but the same measuring stand is also installed on the left side.

The cable position measuring stand 67 has a reference plate 69 attached to the pedestal 11, as shown in FIGS. The reference plate 69 is attached vertically to the upper surface of the gantry 11 and also vertically to the longitudinal direction of the gantry 11. In the vicinity of the upper end of the reference plate 69, as shown in FIG. 8, a recess 71 that opens to the front side (or the back side) is formed. The recess 71 is a portion for housing the cable C. Measuring devices 73 for measuring the distance from the reference position of the reference plate 69 (for example, the inner surface of the recess 71) to the surface of the cable C are attached above, below, and behind the recess 71, respectively. Although a scale is shown as the measuring device 73 in the illustrated example, a dial gauge or the like can also be used. When the cable is straightened, the vertical position and the front-back position of the cable C are measured by these measuring devices 73, which is used as a guide for applying the straightening force, and whether or not the straightening has been properly performed. Confirm.

When the cable straightening operation is completed, the central support stand 63 and the measurement stand 67 are removed, and the mold 65 is installed in the central portion of the gantry 11. The details are shown in Figure 9.
And shown in FIG. The mold 65 is composed of a combination of an upper mold 65a and a lower mold 65b as shown in FIG. Figure 9
Shows only the lower mold 65b. The lower mold 65b is installed on the pedestal 11 via the lifting device 75. Lifting device 75
Is for moving the lower die 65a up and down by a hydraulic mechanism. A guide for positioning the lifting device 75 is provided on the gantry 11.

In the case of molding the connecting portion insulator, first, the lower die 65b is lifted to bring the axis of the cable C into alignment with the straightened cable C, and the upper die 65a is placed on the lower die 65b. Injection. When crosslinking is performed after the resin is solidified, the mold 65 is removed, and a crosslinking pipe is installed in the elevating device 75 to perform crosslinking. As described above, the support base for connecting the power cable of the present invention can be used not only for straightening the cable but also for forming the connection portion insulator.

It should be noted that it is preferable to attach a measuring device for measuring the amount of vertical displacement of the female screw cylinder 41 or the cable gripping tool 29 to the front-rear moving board 51. Further, it is preferable to attach a measuring device for measuring the displacement amount of the front-rear moving plate 51 in the front-rear direction to the left-right moving plate 55. By doing so, the amount of displacement of the cable gripper 29 in the up-down direction and the front-rear direction can be ascertained, so that correction can be easily performed according to the degree of bending of the cable.

Next, with reference to FIGS. 11 to 13, a method of correcting a power cable using the above-described power cable connecting support will be described. In the figure, M is an operator.
First, as shown in FIG. 11, a pedestal 1 is provided below the power cable C.
1 is installed, and the sheath portion C1 of the power cable is gripped by the cable grippers 29A and 29D of the support stands 27A and 27D at both ends. Also, the support stand 27B inside thereof,
The insulator part C2 of the power cable is gripped by the cable grippers 29B and 29C of 27C. Further, the cable gripping tool 64 of the central support stand 63 grips the conductor connecting portion C3 of the power cable. On the other hand, the power cable C is tensioned by the lever block 77.

When the power cable C is bent to the opposite side when viewed from above as shown in FIG. 12, the cable grippers 29A and 29C are moved rearward, and the cable grippers 29B and 2B are connected.
Bending can be corrected by moving 9D forward. Further, when the power cable C is bent to the same side when viewed from above as shown in FIG. 13, the cable grippers 29A and 29D are moved forward and the cable grippers 29B and 29D.
If C is moved backward, the bend can be corrected.

In any case, the support stands 27A-2
Since the 7D is movable in the longitudinal direction and the directions of the cable grippers 29A to 29D can be freely changed, the power cable C is not overpowered. Further, since it is not necessary to use a lever block or a chain block near the central portion of the connection portion, there is little risk of foreign matter entering.

[Embodiment 2] FIGS. 14 and 15 show another embodiment of the present invention. In this power cable connecting support, one support stand 27A, 27B is provided on each side of the center of the gantry 11, and a center support stand 63 is provided in the center of the gantry 11. The configurations of the gantry 11, the support stands 27A and 27B, the central support stand 63, etc. are the same as those in the first embodiment.

In the case of this configuration, in order to straighten the bent cable C as shown in FIG. 14 or 15, for example, the central support stand 63 and the support stands 27 on both sides are provided.
A force in the arrow direction may be applied by the lever block 77 between A and 27B. By doing so, the central support stand 63 supported by the rigid pedestal 11 and the support stands 27A, 27B on both sides serve as a fulcrum when the cable C is straightened. Can be reduced.

[Embodiment 3] FIGS. 16 and 17 show still another embodiment of the present invention. In this power cable connecting support, one support stand 27A, 27B is provided on each side of the central portion of the gantry 11, and the central support stand is omitted. Frame 11, support stands 27A, 27B
The configuration such as is the same as that of the first embodiment.

In the case of this configuration, in order to correct the bent cable C as shown in FIG. 16 or 17, for example, the lever blocks 77 are provided at three positions between the support stands 27A and 27B on both sides in the arrow direction. You should add the power of. In this way, the support stands 27A and 27B supported by the rigid pedestal 11 serve as fulcrums when the cable C is straightened, so that the number of lever blocks 77 used can be reduced as compared with the conventional case.

The support stands 27A and 27B on both sides are provided.
Can also be corrected by arranging them at narrower intervals and applying a force at a position outside the support stands 27A, 27B during correction. This has the advantage that the lever block need not be provided near the center of the cable connecting portion.

[0042]

As described above, by using the power cable connecting support of the present invention, it is possible to easily correct the bending of the connection portion of the power cable. Also, since the use of lever blocks and chain blocks can be eliminated or the number of used blocks can be reduced near the center of the connection part, the risk of foreign matter entering the connection part can be reduced, and a high-quality connection part can be obtained. Can be formed.

[Brief description of drawings]

FIG. 1 is a rear view of a support base for connecting a power cable according to an embodiment of the present invention.

FIG. 2 is a plan view of the support base of FIG.

FIG. 3 is a side view of the support base of FIG.

4A is a plan view and FIG. 4B is a side view showing a state where the arm tip end portion of the support base of FIG.

5 is a rear view of the support stand in the support base of FIG.

6 is a partially cutaway side view of the support stand of FIG.

7 is a rear view of the cable position measuring stand on the support base of FIG. 1. FIG.

8 is a side view of the main part of the measurement stand of FIG.

9 is a rear view showing a state in which the mold is installed in the center of the gantry on the support base of FIG. 1. FIG.

FIG. 10 is a side view of the state of FIG.

11 is a rear view showing a state in which the power cable is straightened using the support base of FIG. 1. FIG.

12 is a plan view showing an example of the bending correction method in FIG.

13 is a plan view showing another example of the bending correction method in FIG.

FIG. 14 is a plan view showing an example of a usage state of a power cable connecting support according to another embodiment of the present invention.

FIG. 15 is a plan view showing another example of a usage state of the support base of FIG.

FIG. 16 is a plan view showing an example of a usage state of a power cable connecting support according to still another embodiment of the present invention.

FIG. 17 is a plan view showing another example of a usage state of the support base shown in FIG.

[Explanation of symbols]

 11: Stand 13: Leg 15: Arm 19: Wall 27, 27A-27D: Support stand 29, 29A-29D: Cable gripping tool 31: Left and right guide rails 33a, 33b: Cleat 37: Table 41: Female screw cylinder 49: Male screw Pillar 51: Front-rear moving plate 53: Front-rear guide rail 55: Left-right moving plate 63: Central support stand 64: Cable gripping tool 65: Mold 67: Cable position measuring stand C: Power cable M: Worker

Claims (6)

[Claims] 1. A power cable connection characterized in that a support stand (27) having a cable gripping tool (29) is provided on a rigid base (11) for at least one for each cable to be connected. Support stand. 2. A central support stand (63) having a cable grip (64) is provided between the support stands so as to be removable or movable to a retracted position. Support for power cable connection. 3. The power cable connecting support according to claim 1, wherein the cable gripping tool (29) is rotatable about the rising direction of the support stand (27) as a rotation center axis. Stand. 4. The power cable connection according to claim 1, wherein the support stand (27) has a mechanism for moving the cable gripping tool (29) in the cable cross-section direction. Support stand. 5. The support stand for connecting a power cable according to claim 1, wherein the support stand (27) is movable in the cable longitudinal direction. 6. An arm (1) which can be fixed to a frame (11) on a stand (21) in a curved road or manhole.
5) The support base for connecting a power cable according to any one of claims 1 to 5, characterized in that the support base is provided.