Cable support tool, mounting method of high-voltage cable and removal method of high-voltage cable

Abstract

To provide a cable support tool which allows mounting and removal of a high-voltage cable except in the vicinity of an electric pole, and a mounting method and a removal method of the high-voltage cable using the cable support tool.SOLUTION: A cable support tool 1 comprises: a coupling part 3 coupled with a hook 101 of a winch; an arm part 2 connected with the coupling part and to which lead connectors 51, 61, and 71 on the tips of high-voltage cables 5, 6, and 7 are mounted; and a holding part 4 which holds a middle part of the high-voltage cables 5, 6, and 7 mounted to the arm part 2 to form slacks among the lead connectors 51, 61, and 71.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a cable support used to support a high-voltage cable attached to a high-voltage overhead electric line, and to a method for installing and removing a high-voltage cable using this cable support. [Background technology]

[0002] High-voltage cables are used when bypassing high-voltage overhead lines (hereinafter referred to as high-voltage lines) for construction work, or when connecting a power supply vehicle to the high-voltage lines during a power outage.High-voltage cables have a lead connector attached to the end that holds the high-voltage line.The lead connector can be supported and attached to the high-voltage line by an insulated operating rod.

[0003] When attaching such a high-voltage cable to a high-voltage line, a cable support is used to temporarily support the high-voltage cable (see, for example, Patent Document 1). A conventional cable support includes a frame portion that is attached to a utility pole and an arm portion that is fixed to the frame portion. The arm portion has a shape in which conductive metal rods are connected in a lattice pattern.

[0004] When attaching high-voltage cables to a high-voltage line, multiple high-voltage cables are supported by the arm of a cable support tool attached to a utility pole using lead connectors. Then, a worker in the bucket of an aerial work vehicle supports and operates the lead connectors with an insulated operating rod to remove the high-voltage cables from the cable support tool and attach the removed high-voltage cables to the high-voltage line.

[0005] Furthermore, when removing the high-voltage cable from the high-voltage line, a worker in the bucket of the aerial work vehicle supports and operates the lead connector with an insulated operating rod to remove the high-voltage cable from the high-voltage line, and then attaches the removed high-voltage cable to a cable support tool. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-204691 Summary of the Invention [Problem to be solved by the invention]

[0007] Conventional cable support devices must be attached to utility poles, which restricts the location and range of work to the vicinity of the utility pole. This makes work difficult and time-consuming. In particular, in the event of a sudden disaster or other emergency, many work vehicles and power supply vehicles are dispatched, making it impossible to work near the utility pole, which can hinder the early transmission of power.

[0008] Therefore, an object of the present invention is to provide a cable support that enables the installation and removal of high-voltage cables in locations other than near utility poles, and a method for installing and removing high-voltage cables using this cable support. [Means for solving the problem]

[0009] In order to solve the above problem, the invention of claim 1 is a cable support device characterized by comprising a connecting portion that is connected to the hook of a winch, and an arm portion that is connected to the connecting portion and to which a lead connector at the tip of a high-voltage cable is attached.

[0010] The invention of claim 2 is characterized in that the cable support device described in claim 1 is provided with a cable holding portion that holds an intermediate portion of the high-voltage cable attached to the arm portion and forms slack between the arm portion and the lead connector.

[0011] The invention of claim 3 is characterized in that in the cable support of claim 1 or 2, the arm portion is in a lattice shape.

[0012] The invention of claim 4 is characterized in that, in the cable support device described in claim 1 or 2, the arm portion is made of a conductor, and the high-voltage cable is grounded by a grounding cable connected to the arm portion.

[0013] The invention of claim 5 is a high-voltage cable installation method comprising: raising a bucket and winch of an aerial work vehicle to the vicinity of a high-voltage overhead electric line; connecting the connecting portion of the cable support according to claim 1 to the hook of the winch; attaching a lead connector of a high-voltage cable to the arm portion of the cable support; lifting the cable support to the vicinity of the bucket with the winch; removing the lead connector from the cable support with an insulated operating rod operated by a worker in the bucket; and attaching the removed lead connector to the high-voltage overhead electric line.

[0014] The invention of claim 5 is a method for removing a high-voltage cable, characterized in that the bucket and winch of an aerial work vehicle are raised to the vicinity of a high-voltage overhead power line, the connecting portion of the cable support device described in claim 1 is connected to the hook of the winch, the cable support device is lifted up to the vicinity of the bucket by the winch, the lead connector is removed from the high-voltage overhead power line by an insulated operating rod operated by a worker riding in the bucket, and the removed lead connector is attached to the cable support device. [Effects of the Invention]

[0015] According to the invention of claim 1, the arm can be connected to a winch via the connecting part and suspended. This allows high-voltage cables to be attached to high-voltage lines at any position between poles, without being restricted to work near utility poles, as long as an aerial work platform can be used. In particular, in the event of a sudden disaster or other emergency, even if multiple aerial work platforms and power supply vehicles are in operation, the vehicle installation positions can be quickly selected, leading to early power transmission.

[0016] According to the invention of claim 2, the cable holding portion creates slack in the high-voltage cable, thereby reducing the weight of the high-voltage cable placed on the lead connector, greatly improving the ease of installation on high-voltage lines, etc.

[0017] According to the invention of claim 3, the arm is made in a lattice pattern, which makes it possible to reduce the weight of the arm while providing it with a predetermined strength. Also, by making the arm in a lattice pattern, it is possible to prevent the lead connector attached to the arm from shifting significantly, making it possible to maintain the hanging balance.

[0018] According to the invention of claim 4, the high-voltage cable supported by the arm portion can be grounded, eliminating the need to ground each high-voltage cable individually, thereby reducing the time and effort required for the work.

[0019] According to the inventions of claims 5 and 6, as long as an aerial work platform can be used, high-voltage cables can be attached to and detached from high-voltage lines at any position between poles, without being restricted to work near utility poles. In particular, even in the event of a sudden disaster or other emergency, when multiple aerial work platforms and power supply vehicles are in operation, the vehicle installation locations can be quickly selected, leading to early power transmission. Furthermore, once power transmission is restored, high-voltage cables can be quickly detached from high-voltage lines. [Brief explanation of the drawings]

[0020] [Figure 1] 1A is a front view of a cable support according to an embodiment of the present invention, FIG. 1B is a side view thereof, and FIG. 1C is a front view of a cable holding portion thereof. [Figure 2] 10 is a diagram showing a state in which a lead connector is attached to a cable support and a high-voltage cable is held by a cable jig. FIG. [Figure 3] 3 is a flowchart showing a high-voltage cable installation method according to an embodiment of the present invention. [Figure 4]10A and 10B are views showing a state in which a high-voltage cable attached to a cable support is removed by an insulated work rod. [Figure 5] 10 is a diagram showing a state in which a high-voltage cable is attached to a high-voltage line using an insulating work rod. FIG. [Figure 6] 3 is a flowchart showing a high-voltage cable removal method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] The present invention will be described below based on the illustrated embodiments.

[0022] Figure 1 shows the configuration of a cable support 1 according to an embodiment of the present invention. Cable support 1 is a device for temporarily supporting high-voltage cables, which is used when bypassing high-voltage lines for construction work or when connecting a power supply vehicle to a high-voltage line during a power outage. As shown in Figure 2, high-voltage cables 5, 6, and 7 are connected at their ends to construction switches or power supply vehicles, and are equipped at their ends with lead connectors 51, 61, and 71 that clamp the high-voltage lines. Lead connectors 51, 61, and 71 can be supported by an insulated operating rod and attached to the high-voltage lines.

[0023] 1(A) shows a front view of the arm portion 2 and the connecting portion 3 of the cable support 1, and FIG. 1(B) shows a side view of the arm portion 2 and the connecting portion 3. FIG. 1(C) shows the cable holding portion 4.

[0024] The arm portion 2 is formed in a grid shape by connecting a pair of horizontally arranged rod-shaped main members 21 with five rod-shaped secondary members 22 arranged vertically between the pair of main members 21 by welding or the like. The main members 21 and secondary members 22 are made of a material that is conductive and has a predetermined strength, such as hot-rolled stainless steel. Attached to the arm portion 2 are, for example, three high-voltage cables 5, 6, and 7 and one grounding cable 8.

[0025] The connecting portion 3 is made of a substantially triangular plate material connected to the upper portion of the arm portion 2 by welding or the like, and is provided with a hole 31 for connecting to the hook of a winch of a vehicle for working at height.

[0026] The cable holding portion 4 is a rope having loop portions 41 at both ends, that is, a so-called base rope.

[0027] As shown in Figure 2, the cable support 1 is connected to a hook 101 of a winch 10 (see Figure 4) of an aerial work platform by inserting the hook 101 into the hole 31 of the connecting part 3. Three high-voltage cables 5, 6 and 7 are attached to the arm part 2 of the cable support 1 which is connected to and hung from the hook 101 by their respective lead connectors 51, 61 and 71. In addition, a grounding clip 81 for a grounding cable 8 is attached to the arm part 2.

[0028] The cable holding unit 4 has a loop-shaped portion 41 at one end hooked onto a winch hook 101, and the other end passed through so as to be entangled with the secondary member 22 located approximately in the center of the arm unit 2. The loop-shaped portion 41 at the other end collectively holds the middle portions of the three high-voltage cables 5, 6, and 7 (for example, at a position approximately 3 m from the lead connectors 51, 61, and 71), and creates slack between the lead connectors 51, 61, and 71. The position at which the three high-voltage cables 5, 6, and 7 are held by the cable holding unit 4 is, for example, a position approximately 100 to 200 mm below the arm unit 2. This allows the three high-voltage cables 5, 6, and 7 to be stably suspended by the winch.

[0029] Next, a method for installing a high-voltage cable using the cable support 1 will be described with reference to the flowchart shown in FIG.

[0030] As shown in Figure 4, the bucket 9 and winch 10 of the aerial work platform are raised to the vicinity of the high-voltage wire 11 (step S1). Two workers W1 and W2 ride in the bucket 9 and perform tasks such as stripping the insulating coating of the high-voltage wire 11 and polishing the conductor wire. If the three high-voltage wires 11 are close to each other, a cable separator (not shown) or the like is used to keep the high-voltage wires 11 at a predetermined distance or more to prevent short circuits between the wires. The hook 101 of the winch 10 is lowered to near the ground.

[0031] Next, as shown in FIG. 2, the hook 101 of the winch 10 is inserted into the hole 31 of the connecting portion 3, and the cable support 1 is connected (step S2).

[0032] Lead connectors 51, 61, and 71 for three high-voltage cables 5, 6, and 7 are attached to arm portion 2 of cable support 1, which is connected to and hung from hook 101 (step S3). In addition, grounding clip 81 for grounding cable 8 is also attached to arm portion 2.

[0033] The loop portion 41 at one end of the cable holding portion 4 is hooked onto the hook 101 of the winch 10, and the other end is passed downward so as to be entangled with the secondary member 22 at approximately the center of the arm portion 2. Next, the loop portion 41 at the other end is used to hold the middle portions of the three high-voltage cables 5, 6, and 7 together, and slack is formed between the lead connectors 51, 61, and 71 (step S4).

[0034] As shown in FIG. 4, the cable support 1 is raised by the winch 10 to the vicinity of the bucket 9 (step S5).

[0035] The worker W1 riding on the bucket 9 operates the insulated pliers 13 to hold down the arm portion 2 of the cable support 1 and suppress the shaking of the cable support 1. Meanwhile, the other worker W2 uses the insulated operating rod 14 to support and operate the lead connector 51 to remove it from the cable support 1. The removed lead connector 51 is attached to the high-voltage wire 11 as shown in FIG. 5 (step S6). When attaching the lead connector 51 to the high-voltage wire 11, it is desirable to hold down the high-voltage wire 11 with the insulated pliers 13.

[0036] Thereafter, the same procedure is repeated for the lead connectors 61 and 71 , so that all the high-voltage cables 5 , 6 , and 7 are removed from the cable support 1 and attached to the high-voltage wire 11 .

[0037] Next, a method for removing a high-voltage cable using the cable support 1 will be described with reference to the flowchart shown in FIG.

[0038] As shown in Fig. 4, the bucket 9 and winch 10 of the aerial work vehicle are raised to the vicinity of the high-voltage line 11 (step S11). Two workers W1 and W2 get on the bucket 9. The hook 101 of the winch 10 is lowered close to the ground.

[0039] Next, as shown in FIG. 2, the hook 101 of the winch 10 is inserted into the hole 31 of the connecting portion 3, and the cable support 1 is connected (step S12).

[0040] The loop portion 41 at one end of the cable holding portion 4 is hooked onto the hook 101 of the winch 10, and the other end is passed downward so as to be entangled with the secondary member 22 at approximately the center of the arm portion 2. Next, the loop portion 41 at the other end is used to hold the middle portions of the three high-voltage cables 5, 6, and 7 together (step S13).

[0041] 4, the cable support 1 is raised by the winch 10 to the vicinity of the bucket 9 (step S14). At this time, since the intermediate portions of the high-voltage cables 5, 6, and 7 are held by the cable holding part 4, slack is formed between the lead connectors 51, 61, and 71.

[0042] As shown in Figure 5, worker W1 riding in the bucket 9 operates the insulated pliers 13 to hold the high-voltage wire 11. Meanwhile, the other worker W2 supports and operates the lead connector 51 with the insulated operating rod 14 to remove it from the high-voltage wire 11. The removed lead connector 51 is attached to the arm portion 2 of the cable support 1 (step S15). When attaching the lead connector 51 to the arm portion 2, it is desirable to hold the arm portion 2 with the insulated pliers 13.

[0043] Thereafter, the same procedure is repeated for the lead connectors 61 and 71, so that all the high-voltage cables 5, 6 and 7 are removed from the high-voltage lines and attached to the cable support 1.

[0044] As described above, with the cable support 1 according to this embodiment, the arm portion 2 can be connected to the winch 10 via the connecting portion 3 and suspended. This allows the high-voltage cables 5, 6, and 7 to be attached to the high-voltage line 11 at any position between the poles, as long as an aerial work vehicle can be used, without being restricted to work near utility poles. In particular, in the event of a sudden disaster or other emergency, even if multiple aerial work vehicles and power supply vehicles are in operation, the installation locations of the vehicles can be quickly selected, which can lead to early power transmission.

[0045] Furthermore, since the cable holding portion 4 is configured to create slack in the high-voltage cables 5, 6 and 7, the weight of the high-voltage cables 5, 6 and 7 placed on the lead connectors 51, 61 and 71 can be reduced, significantly improving the workability when attaching them to the high-voltage line 11, etc.

[0046] Furthermore, according to the cable support 1 of this embodiment, the arm portion 2 is formed in a lattice pattern, so that it is possible to reduce the weight of the arm portion 2 while providing it with a predetermined strength.

[0047] Furthermore, according to the cable support 1 of this embodiment, by making the arm portion 2 lattice-shaped, it is possible to prevent the lead connectors 51, 61, and 71 attached to the arm portion 2 from shifting significantly, and it is possible to maintain the hanging balance.

[0048] Furthermore, with the cable support 1 according to this embodiment, the high-voltage cables 5, 6, and 7 supported by the arm portion 2 can be grounded, eliminating the need to ground each of the high-voltage cables 5, 6, and 7. This reduces the time and effort required for the work.

[0049] Furthermore, according to the high-voltage cable installation and removal methods of this embodiment, as long as an aerial work vehicle can be used, the high-voltage cables 5, 6, and 7 can be installed and removed from the high-voltage line 11 at any position between the poles, without being restricted to work near utility poles. In particular, even in the event of a sudden disaster or other emergency, when multiple aerial work vehicles and power supply vehicles are in operation, the vehicle installation positions can be quickly selected, leading to early power transmission. Furthermore, after power transmission is restored, the high-voltage cables 5, 6, and 7 can be quickly removed from the high-voltage line 11.

[0050] The above describes an embodiment of the present invention, but the specific configuration is not limited to the above embodiment, and even if there are design changes within the scope of the present invention that do not deviate from the gist of the present invention, they are included in the present invention.

[0051] For example, in the above embodiment, a base rope is used as the cable holding portion 4, but a clamp or the like that can hold and release a plurality of high-voltage cables 5, 6 and 7 together may also be used.

[0052] Furthermore, although the above embodiment proposes a new cable support 1, it is also possible to use the arm portion of the conventional cable support described in Patent Document 1. In this case, it is advisable to attach a hanging bracket equivalent to the connecting portion 3 of this embodiment to the arm portion of Patent Document 1, and use a base rope as the cable holder. [Explanation of symbols]

[0053] 1 Cable support 2 Arm section 3 Connecting part 4 Cable holder 5, 6, 7 High voltage cables 51, 61, 71 lead connector 9 Buckets 10 winch 101 Hook 13 Insulated pliers 14 Insulated operating rod

Claims

1. a connecting portion that is connected to a hook of a winch; an arm portion connected to the connecting portion and to which a lead connector at the tip of a high-voltage cable is attached; A cable support comprising:

2. a cable holding portion that holds an intermediate portion of the high-voltage cable attached to the arm portion and forms slack between the cable holding portion and the lead connector; The cable support of claim 1 , further comprising:

3. The arm portion is lattice-shaped.

3. The cable support according to claim 1 or 2.

4. The arm portion is made of a conductor, and the high-voltage cable is grounded by a grounding cable connected to the arm portion.

3. The cable support according to claim 1 or 2.

5. The bucket and winch of the aerial work platform are raised to the vicinity of the high-voltage overhead power line, The connecting portion of the cable support according to claim 1 is connected to the hook of the winch, A lead connector of a high-voltage cable is attached to the arm portion of the cable support tool, Lifting the cable support device close to the bucket with the winch; removing the lead connector from the cable support tool using an insulating operating rod operated by a worker riding in the bucket, and attaching the removed lead connector to the high-voltage overhead electric wire; A high-voltage cable installation method characterized by the above.

6. The bucket and winch of the aerial work platform are raised to the vicinity of the high-voltage overhead power line, The connecting portion of the cable support according to claim 1 is connected to the hook of the winch, Lifting the cable support device close to the bucket with the winch; a worker in the bucket operates an insulating operating rod to remove the lead connector from the high-voltage overhead electric wire, and attaches the removed lead connector to the cable support tool; A high-voltage cable removal method characterized by the above.

Images