JP2009071915A - Tool and method for untwisting power cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool and a method for untwisting a power cable, for making it easy to perform the stop checking work of the power cable by performing the untwisting work of two or more unit cables safely and surely. <P>SOLUTION: This is an untwisting tool for a power cable for untwisting a plurality of unit cables from the state of being twisted integratedly and separating one line of the unit cables from other lines. The untwisting tool has an untwisting bar, which is to be inserted into among individual unit cables twisted with one another so as to untwist them, and an untwisted state keeping member, which keeps the state of having untwisted each unit cable. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention confirms whether or not the cable is in a stopped state (the cable for the power cable) before cutting the power cable such as an existing CVT in a state where a plurality of unit cables are integrally twisted together. A power cable that is used to make it easier to perform stop confirmation work, and to untwist the unit cable that has been twisted together so that one wire to be detected is separated from the other two wires. The present invention relates to a twist back tool and a twist back method.

  A power cable such as an existing CVT disposed in the trough is generally composed of three unit cables in order to transmit three-phase power. As shown in FIG. 8 (a), this power cable is twisted so that the outer peripheral surfaces of adjacent unit cables are in contact with each other, thereby substantially uniting three unit cables.

  In addition, as shown in FIG. 7, in order to supply a new distribution box for the purpose of supplying a new customer between the A supply distribution box and the B supply distribution box, this power cable cutting operation is performed. It is necessary to confirm whether or not the cable is surely stopped as the preceding stage.

  That is, this power cable stop confirmation work includes, for example, confirmation of the cable cut location, check of the cut cable, securing a foothold for the cable cut location, cable stop by switch operation, determination of the cable stop line, short circuit to the cable Installation of grounding tools, peeling of vinyl sheath, peeling of rubberized cloth tape, peeling of shielding copper tape, peeling of semiconductor cloth tape, wiping of carbon on insulating layer surface, confirmation of stopping of cable, cable pick to cable This is done by a procedure such as driving in.

  And when performing the stop check operation | work of such an electric power cable, you have to return the twist of these three unit cables, and make it easy to perform an operation | work.

  However, since there has not been a dedicated tool used for the untwisting work so far, the unit cable has been untwisted by using a handle such as a screwdriver or a hammer.

  That is, as shown in FIG. 8A, when untwisting the three unit cables K1, K2, and K3 that are twisted together, first, as shown in FIG. The handle of H is inserted between the unit cable K1 and the unit cable K2, and the handle of the other hammer H is inserted between the unit cable K2 and the unit cable K3.

  And as shown in FIG.8 (c), by twisting these hammers H apart in the mutually opposite direction, each twist of each unit cable K1, K2, K3 is returned and it is made into an open state.

In this way, in a power cable in a state where a plurality of unit cables are integrally twisted, if the twist is returned and the unit cables are separated from each other, it becomes easy to confirm the stop of the power cable.
nothing special

  However, in the past, in the manufacturing process of power cables, three unit cables are uniformly twisted, so when only a part of them is forcibly twisted back using a handle such as a screwdriver or hammer, Due to the repulsive force, the driver, hammer, etc. may come off, and the operator's limbs may be caught in the unit cable, which is inferior in terms of safety and workability.

  Therefore, the present invention was created in view of the existing circumstances as described above, and it is possible to safely and surely perform the untwisting operation of a plurality of unit cables and facilitate the operation of confirming the stop of the power cable. An object of the present invention is to provide a power cable twisting tool and a twisting method.

  The present invention is a power cable untwisting tool for unwinding a plurality of unit cables from a state in which the unit cables are integrally twisted, and separating one line of the unit cables from the other line. The return tool includes a twist-back rod that performs twist-back by inserting between the unit cables that are twisted together, and a untwisted state holding member that holds the untwisted state of each unit cable. Thus, the above-mentioned problem has been solved.

  Moreover, in order to make it easy to enter between the twisting of each unit cable, the both ends of the twist back rod are formed in a taper shape, thereby solving the above-mentioned problem.

  Further, the untwisting rod is made of an electrically insulating material of wood, epoxy glass, or cloth bake, thereby solving the above-described problem.

  In addition, the untwisted state holding member is formed of a clenched fist-like block body, thereby solving the above-described problem.

  In addition, the untwisted state holding member supports a first fixing portion that supports one wire of each unit cable on one end surface side of the block body, and supports the other wire of each unit cable on the other end surface side of the block body. By having the second fixing portion, the above-described problem was solved.

  Moreover, the 1st fixing | fixed part of the untwisted state holding member was formed of one recessed part, and the 2nd fixing | fixed part was formed by connecting the several recessed part continuously, and solved the subject mentioned above similarly.

  In addition, the untwisted state holding member is made of hard rubber having a hardness of about 70 °, thereby solving the above-described problem.

  Moreover, the said hard rubber solved the subject mentioned above similarly by being urethane rubber.

  On the other hand, the present invention is a method for untwisting a power cable for unwinding a unit cable from a state in which a plurality of unit cables are integrally twisted and separating one line of the unit cable from another line, The process of untwisting each unit cable by inserting a untwisted rod between each unit cable twist at a specific location, and maintaining the untwisted state that is a block body between each unit cable of the untwisted part The step of arranging the member, the step of moving the rear wall of the untwisted state holding member with a hammer and moving it forward, and another twisted portion on the untwisted part so as to be back-to-back with the untwisted state holding member A step of arranging the return state holding member, a step of pulling out the untwisting rod, and a step of moving the rear wall of another twist back state holding member with a hammer and moving it forward. It has solved the Ku the above-described problems.

  Also, a method of untwisting a power cable for unwinding a plurality of unit cables from a state in which the unit cables are integrally twisted, and separating one wire of the unit cable from the other wire, A step of untwisting each unit cable by inserting a untwisted rod between the unit cable twists, and a untwisted state holding member as a block body is disposed between each unit cable of the untwisted portion. Inserting the untwisted rod at a predetermined distance away from the specific location, the step of striking the rear wall of the untwisted state holding member with a hammer and moving it forward, the step of extracting the untwisted rod The step of performing untwisting of each unit cable and the other untwisted state holding member that is a block body between the unit cables of the portion where the twist has been returned are described above. The above-mentioned problem is also composed of a step of arranging the back-to-back members, a step of removing the untwisted rod, and a step of moving the rear wall of the other untwisted state holding member forward with a hammer. Settled.

  Further, the step of disposing the untwisted state holding member, which is a block body, between the unit cables of the untwisted portion includes supporting one wire of each unit cable in the concave portion of the first fixing portion of the untwisted state holding member. The above-mentioned problem was solved by supporting the other line of each unit cable in the recessed portion provided continuously with the second fixing portion.

  ADVANTAGE OF THE INVENTION According to this invention, the untwisting operation | work of a plurality of unit cables can be performed safely and reliably, and the stop confirmation operation | work of a power cable can be made easy.

  That is, in the present invention, the untwisting tool includes a untwisting rod that is inserted between the unit cables that are twisted together to perform untwisting, and a untwisted state that maintains the untwisted state of each unit cable. Since the holding member is provided, each unit cable can be easily untwisted by the untwisting rod, and the unwinding of the untwisting rod due to the repulsive force of the twist can be reliably prevented by the untwisted state holding member.

  Therefore, it is possible to eliminate the danger of the operator's limbs being caught in the unit cable as in the conventional case, and to perform the untwisting operation of each unit cable safely and reliably.

  In addition, since both ends of the twist-back bar are formed in a taper shape so as to easily enter between the twists of each unit cable, the twisting resistance of the cable is resisted between the twists of each unit cable. Thus, the twist-back bar can be easily inserted.

  Furthermore, since the untwisting rod is made of an electrically insulating material of wood, epoxy glass, or cloth bake, it is possible to prevent an electric shock from occurring during the untwisting operation.

  In addition, since the untwisted state holding member is formed by a clench-fist-like block body, the untwisted state holding member is arranged between a plurality of unit cables, and one wire to be detected is connected from another line. Can be released.

  In addition, the untwisted state holding member supports a first fixing portion that supports one wire of each unit cable on one end surface side of the block body, and supports the other wire of each unit cable on the other end surface side of the block body. Since it has a 2nd fixing | fixed part, it can support reliably one line which carries out the electric power detection of a unit cable in the state which ensured the distance from the other line.

  Moreover, since the 1st fixing | fixed part of the untwisted state holding member is formed by one recessed part, and the 2nd fixing | fixed part is formed by connecting the several recessed part, 1 line which detects the electric power of a unit cable, The other wire can be reliably supported by the respective concave portions.

  Furthermore, since the untwisted state holding member is made of hard rubber having a hardness of about 70 °, the pressure load on the cable is reduced when the untwisted state holding member is arranged between a plurality of unit cables. In addition, the insulator inside the unit cable is not adversely affected.

  Further, since the hard rubber is urethane rubber, it is possible to repair each unit cable under complete insulation management.

  In addition, the present invention is a method for untwisting a power cable for unwinding a unit cable from a state in which a plurality of unit cables are integrally twisted and separating one line of the unit cable from another line. , A step of untwisting each unit cable by inserting a twistback rod between the twisted unit cables at a specific location, and a untwisted state that is a block body between each unit cable of the untwisted portion The step of arranging the holding member, the step of moving the rear wall of the untwisted state holding member with a hammer and moving it forward, and the other part on the untwisted part so that it is back-to-back with the untwisted state holding member From the step of arranging the untwisted state holding member, the step of pulling out the untwisted bar, and the step of moving the rear wall of the other untwisted state holding member with a hammer and moving it forward. Working untwisted power cable, by a person of workers can be completed in approximately 2 minutes.

  And while untwisting each unit cable easily with a twist back bar, the twist back state holding member can reliably prevent the untwist bar from coming off due to the repulsive force of the twist.

  For this reason, the untwisted state holding member can support the unit cable for detecting the electric power separately from the other lines, and can facilitate the operation of confirming the stop of the power cable.

  Specifically, for example, it is possible to easily perform various operations such as cable alive determination, cable sheath peeling, and cable pick driving, and further repair operations such as cable cutting and replacement connection.

  Also, a method of untwisting a power cable for unwinding a plurality of unit cables from a state in which the unit cables are integrally twisted, and separating one wire of the unit cable from the other wire, A step of untwisting each unit cable by inserting a untwisted rod between the unit cable twists, and a untwisted state holding member as a block body is disposed between each unit cable of the untwisted portion. Inserting the untwisted rod at a predetermined distance away from the specific location, the step of striking the rear wall of the untwisted state holding member with a hammer and moving it forward, the step of extracting the untwisted rod The step of performing untwisting of each unit cable and the other untwisted state holding member that is a block body between the unit cables of the portion where the twist has been returned are described above. It consists of a step of arranging them back to back, a step of pulling out the untwisted rod, and a step of hitting the rear wall of another untwisted state holding member with a hammer and moving it forward. The return operation can be performed safely.

  That is, each unit cable is easily untwisted by the untwisting rod, and two untwisted state holding members are assigned between each unit cable. The separated state can be reliably maintained by the two untwisted state holding members.

  Further, the two untwisted state holding members are arranged so as to be back-to-back with each other, and are present at a predetermined distance, so that the power cable is untwisted, and one wire for detecting the power of the unit cable, A large distance from other lines can be secured.

  Therefore, it becomes easier to confirm the stop of the power cable.

  Further, the step of disposing the untwisted state holding member, which is a block body, between the unit cables of the untwisted portion includes supporting one wire of each unit cable in the concave portion of the first fixing portion of the untwisted state holding member. Since the other wire of each unit cable is supported by the recessed portion provided continuously with the second fixing portion, the one wire to be detected can be reliably separated from the other wire according to the predetermined size of the block body itself.

  Moreover, since each unit cable is supported by each recessed part, a unit cable does not fall out from this recessed part, and it can maintain reliably the state which separated the 1 line | wire which detects the power of a unit cable from another line.

  Furthermore, between the unit cables in the untwisted state, the two untwisted state holding members are arranged so as to be back-to-back with each other, and are present at a predetermined distance. The member supports one line of each unit cable in the concave portion of the first fixed portion, and supports the other line of each unit cable in the concave portion provided continuously in the second fixed portion. And a large distance from other lines can be secured.

  Therefore, the untwisting operation of the unit cable in which a plurality of cables are twisted can be performed more safely and reliably.

  In addition, as another method of using the untwisting tool of the present invention, in a power cable that is substantially united by twisting three unit cables, only one of the three unit cables is used. When a malfunction such as insulation breakdown occurs, the unit cable of the accident phase is released by untwisting the three unit cables together and then separating the accident phase unit cable from the other unit cables that are in the healthy phase. The untwisting tool of the present invention can be used to cut only the cable and reconnect the replacement unit cable.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  The present invention is a power cable untwisting tool for unwinding a plurality of unit cables from a state in which the unit cables are integrally twisted and separating one line of the unit cables from another line.

  This power cable twist back tool is composed of a twist back rod 1 shown in FIG. 1 and a twist back state holding member 11 (11A, 11B) shown in FIGS.

  In the three unit cables K1, K2, and K3 for transmitting three-phase electric power disposed in the trough (see FIG. 8A), the untwisting rod 1 is twisted with each other. The unit cables K1, K2, and K3 are twisted back by being inserted between the cables K1, K2, and K3.

  Further, the untwisted state holding member 11 (11A, 11B) holds the unit cable K1, K2, K3 in a state where the twist is returned. Two untwisted state holding members 11 (11A and 11B) are prepared.

  In the present embodiment, a twisting tool is applied to the power cable that is substantially united by twisting the three unit cables K1, K2, and K3 to return the twist. However, the present invention is not limited to the three-phase unit cables K1, K2, and K3, and a twisting tool may be applied to the three-phase or more unit cables.

  In addition, when applying a twist back tool to the unit cable more than three phases, the number of 2nd fixing | fixed part 13a, 13b mentioned later in the twist back state holding member 11 (11A, 11B) increases.

  As shown in FIGS. 2 (a) and 2 (b), the untwisted rod 1 is formed into a rod shape having a length of about 320 mm and a diameter of about 30 mm, using an electrically insulating material such as wood, epoxy glass, and cloth bake. Has been.

  Further, the untwisted rod 1 is provided with symmetrical tapers 2 at both ends. The taper 2 is for making it easy to enter between the twists of the unit cables K1, K2, and K3, and has a length of about 70 mm.

  On the other hand, the untwisted state holding member 11 (11A, 11B), as shown in FIGS. 3A and 3B, is a hard rubber having a hardness of about 70 °, for example, an electrically insulating urethane rubber or the like. It is formed by a fist-like block body.

  Further, the untwisted state holding member 11 (11A, 11B) is disposed between the unit cables K1, K2, and K3 that have been untwisted, and is easily moved between the unit cables K1, K2, and K3. (B) As shown in FIGS. 4 (a) and 4 (d), the vertically long front wall F of the block body is formed narrower than the vertically long rear wall B, and as it goes to the rear wall B side, It is formed so as to gradually become wider.

  The front wall F of the block body has a height of about 7.5 cm in the vertical direction. The rear wall B has a height of about 9.7 cm in the vertical direction. Further, the block body has a thickness of about 6.5 cm in the front-rear direction between the front wall F and the rear wall B.

  Then, as shown in FIG. 4A, the untwisted state holding member 11 (11A, 11B) has one wire (for example, each unit cable) on the right end surface side of the block body with the front wall F as a boundary. , A first fixing part 12 for supporting the unit cable K3).

  Further, the block body includes a second fixing portion 13 (13a, 13b) that supports the other wires of the unit cables (for example, the unit cables K1, K2) on the left end face side with the front wall F as a boundary. Yes.

  As shown in FIGS. 3B and 4A, the first fixing portion 12 of the untwisted state holding member 11 (11A, 11B) is formed by a relatively large recess. The second fixing portion 13 is formed by connecting a relatively small concave portion (13a) and a middle concave portion (13b) vertically.

  And as shown in FIG.4 (b) (c) (d), about 1.5 cm thick part by the side of the rear wall B is formed flat in the untwisted state holding member 11 (11A, 11B). Yes.

  Therefore, as shown in FIGS. 4A, 4B, and 4D, the first fixing portion 12 includes a flat surface 12b that is curved in a concave shape on the rear wall B side, and the front wall from the end of the flat surface 12b. It is formed by the inclined surface 12a which is present until F and is curved in a concave shape. The inclined surface 12a is inclined so that the block body gradually becomes narrower as it goes from the flat surface 12b to the front wall F side.

  Moreover, as shown in FIGS. 3A and 3B, the concave portion 13a located above the second fixing portion 13 has a flat surface 13a-2 curved in a concave shape on the rear wall B side, and a flat surface. It is formed by the inclined surface 13a-1 which curves from the end of the surface 13a-2 to the front wall F and which is curved in a concave shape.

  Similarly, the concave portion (13b) located below the second fixed portion 13 includes a flat surface 13b-2 that is curved in a concave shape on the rear wall B side, and an end portion of the flat surface 13b-2 from the end portion of the flat surface 13b-2 to the front wall F. It is formed by an inclined surface 13b-1 that is curved in a concave shape.

  These inclined surfaces 13a-1 and 13b-1 are inclined so that the width of the block body gradually becomes narrower from the flat surfaces 13a-2 and 13b-2 toward the front wall F side.

  Furthermore, the upper end side of the inclined surface 13a-1 of the concave portion (13a) located above the second fixing portion 13 extends from the upper end portion of the flat surface 13a-2 to the front wall F as shown in FIG. It inclines so that height may become low gradually toward an upper end part.

  Further, as shown in FIGS. 4 (a) and 4 (b), the upper part of the first fixing portion 12 is a linear flat surface b existing on the rear wall B side and the front wall F from the end of the flat surface b. There is a linear inclined surface a formed up to this point.

  In addition, between the linear flat surface b above the first fixed portion 12 and the flat surface 13a-2 curved in a concave shape above the second fixed portion 13, FIG. As shown in FIG. 3, there is a horizontal flat surface d that is curved in a concave shape. Further, between the linear inclined surface a above the first fixed portion 12 and the inclined surface 13a-1 curved in a concave shape above the second fixed portion 13, FIG. As shown, there is an inclined surface c curved in a concave shape.

  As shown in FIGS. 3B, 4B, and 4C, the inclined surface c gradually increases from the horizontal flat surface d curved in a concave shape on the rear wall B side to the upper end portion of the front wall F. Inclined to lower the height. Further, the inclined surface c is formed in a substantially triangular shape that becomes gradually narrower from the horizontal flat surface d curved in a concave shape on the rear wall B side to the upper end portion of the front wall F.

  In addition, as shown in FIG. 4E, a flat surface e exists on the lower surface of the block body. The flat surface e is formed wider than the other flat surfaces d, b, 12b, 13a-2, and 13b-2 of the block body. Further, there is a lower flat surface f that becomes gradually narrower from the flat surface e to the front wall F side. And the lower surface of a block body is formed in the substantially trapezoid shape by both the flat surfaces e and f.

  Below, the twisting-back method of the electric power cable using the untwisting rod 1 and the twisted state holding member 11 (11A, 11B) will be described.

  First, as shown in FIG. 5 (a), for example, the taper 2 of the untwisting rod 1 is forcibly inserted between the unit cable K2 and the unit cable K3 so as to pry between the unit cables K2 and K3. To.

  Then, the untwisting rod 1 is rotated in the direction to untwist the power cable to untwist each unit cable K1, K2, K3, and a gap is generated between each unit cable K1, K2, K3. Like that.

  Next, in the vicinity of the untwisted rod 1, as shown in FIG. 5 (b), one untwisted state holding member is provided inside each of the three unit cables K1, K2, K3 in the untwisted state. 11A is arranged.

  At this time, as shown in FIGS. 6A, 6B, and 6C, the first fixed portion 12 on one end side of the untwisted state holding member 11A is connected to the three unit cables K1, K2, and K3. One electric wire K3 is supported, and the other two wires K1, K2 in the three unit cables K1, K2, K3 are connected to the second fixing portions 13a, 13b on the other end side of the untwisted state holding member 11A. Each is supported.

  Thereafter, as shown in FIG. 5C, the rear wall B of the untwisted state holding member 11A addressed between the three unit cables K1, K2, and K3 is struck with a pick hammer H or the like. Then, the untwisted state holding member 11A is moved forward, and the twists of the three unit cables K1, K2, K3 are further returned by the first fixing portion 12 and the second fixing portions 13a, 13b.

  Next, as shown in FIG.5 (d), the other untwisted state holding member 11B is arrange | positioned in the vicinity where the untwisting rod 1 is inserted. At this time, the two untwisted state holding members 11 </ b> A and 11 </ b> B are arranged so that their rear walls B face each other and are back to back with each other.

  Next, the untwisting rod 1 is pulled out.

  Then, the rear wall B of the untwisted state holding member 11B arranged between the three unit cables K1, K2, and K3 is moved forward by hitting with a hammer H, and the first fixing portion 12 and the second fixing member 12B are moved forward. The twists of the three unit cables K1, K2, and K3 are further returned by the fixing portions 13a and 13b.

  Then, as shown in FIG. 5 (d), the two untwisted state holding members 11A and 11B exist at a predetermined distance, and the two untwisted state holding members 11A and 11B A large distance is secured between the first line K3 for detecting the voltage of the cable and the other lines K1 and K2.

  The two untwisted state holding members 11A and 11B are separated by at least 60 cm in order to ensure a large distance between the one wire K3 for detecting the voltage of the unit cable and the other wires K1 and K2.

  Below, the other twisting-back method of the electric power cable using the twisting-back rod 1 and the twisted-back state holding member 11 (11A, 11B) is demonstrated.

  First, as shown in FIG. 5 (a), for example, the taper 2 of the untwisting rod 1 is forcibly inserted between the unit cable K2 and the unit cable K3 so as to pry between the unit cables K2 and K3. To.

  Then, the untwisting rod 1 is rotated in the direction to untwist the power cable to untwist each unit cable K1, K2, K3, and a gap is generated between each unit cable K1, K2, K3. Like that.

  Next, in the vicinity of the untwisted rod 1, as shown in FIG. 5 (b), one untwisted state holding member is provided inside each of the three unit cables K1, K2, K3 in the untwisted state. 11A is arranged.

  Thereafter, as shown in FIG. 5C, the rear wall B of the untwisted state holding member 11A addressed between the three unit cables K1, K2, and K3 is struck with a pick hammer H or the like. Then, the untwisted state holding member 11A is moved forward, and the twists of the three unit cables K1, K2, K3 are further returned by the first fixing portion 12 and the second fixing portions 13a, 13b.

  Next, the untwisting rod 1 is pulled out.

  Then, the unit cables K1, K2, and K3 are untwisted by inserting the untwisting rod 1 into a spaced apart place at a predetermined distance from the position where the untwisted state holding member 11A is disposed.

  Next, as shown in FIG.5 (d), the other untwisted state holding member 11B is arrange | positioned in the vicinity where the untwisting rod 1 is inserted. At this time, the two untwisted state holding members 11 </ b> A and 11 </ b> B are arranged so as to be back to back with their rear walls B facing each other.

  Next, the untwisting rod 1 is pulled out.

  Then, the rear wall B of the untwisted state holding member 11B arranged between the three unit cables K1, K2, and K3 is moved forward by hitting with a hammer H, and the first fixing portion 12 and the second fixing member 12B are moved forward. The twists of the three unit cables K1, K2, and K3 are further returned by the fixing portions 13a and 13b.

  Then, as shown in FIG. 5 (d), the two untwisted state holding members 11A and 11B exist at a predetermined distance, and the two untwisted state holding members 11A and 11B A large distance is secured between the first line K3 for detecting the voltage of the cable and the other lines K1 and K2.

  In this way, each of the three unit cables K1, K2, K3 is supported by the first fixing portion 12 and the second fixing portions 13a, 13b of the untwisted state holding members 11A, 11B, and the twist is returned. Although there is, it is not limited to this.

  For example, if necessary, a concave shape exists between the linear flat surface b above the first fixed portion 12 and the flat surface 13a-2 curved in a concave shape above the second fixed portion 13. Any one of the three unit cables K1, K2, and K3 may be supported by the curved horizontal flat surface d.

  In addition, the unit cables K1, K2, and K3 are usually returned by using one untwisting rod 1, but the present invention is not limited to this, and two untwisting rods 1 are used. May be.

  At this time, for example, the taper 2 of one untwisting rod 1 is forcibly inserted between the unit cable K1 and the unit cable K2 so as to pry between the unit cables K1 and K2. Similarly, the taper 2 of the other untwisting rod 1 is forcibly inserted between the unit cable K2 and the unit cable K3 so as to pry between the unit cables K2 and K3.

  And, since each of the untwisted rods 1 is twisted in the opposite directions, the respective twists of the unit cables K1, K2, K3 are returned so that a gap is generated between the unit cables K1, K2, K3. is there.

  In this way, by detecting the untwisted state holding members 11A and 11B between the untwisted unit cables K1, K2, and K3, voltage detection is performed in the three unit cables K1, K2, and K3. Since the state where the line K3 is separated from the other two lines K1 and K2 is maintained, the power cable stop confirmation operation is easily performed.

  In the present invention, even a power cable having a strong twist can be easily twisted back without adversely affecting the internal structure of each unit cable, and the unit cable to be detected can be separated from the other two unit cables. The power cable untwisting tool and the twisting back method can be widely used in various constructions to make the power cable stop confirmation work easier.

It is a perspective view which shows the structure of the twist back rod which comprises the twist back tool which concerns on this invention. The structure of a twist back rod is shown, (a) is a side view, (b) is a plan view. The structure of the untwisted state holding member which comprises the untwisting tool which concerns on this invention is shown, (a) is the perspective view seen from the rear wall side, (b) is the perspective view seen from the front wall side. The structure of the untwisted state holding member is shown, (a) is a front view, (b) is a right side view, (c) is a left side view, (d) is a plan view, and (e) is a bottom view. The unit cable untwisting process using the untwisted rod and the two untwisted state holding members will be described. (A) is a perspective view of a state in which the unwound rod is inserted into the twisted portion of the three unit cables. (B) is a perspective view of a state where one untwisted state holding member is placed inside the three unit cables, and (c) is a state where one untwisted state holding member is struck with a hammer and moved. (D) is a perspective view in a state where the other untwisted state holding member is directed to the inside of three unit cables. It explains the state where the untwisted state holding member is addressed to the inside of the three unit cables, (a) is a perspective view seen from an oblique side, (b) is a perspective view seen from an oblique upper side. (C) is the perspective view seen from diagonally backward. In order to cut the power cable in order to install a new distribution box for the purpose of supplying a new customer between the A supply distribution box and the B supply distribution box, It is the schematic which showed the state which needs to confirm whether the cable has stopped reliably. The twisting-back method in a prior art example is demonstrated, (a) is a perspective view which shows the twisted state of three unit cables, (b) is a twisted part of three unit cables with the handle of two hammers The perspective view which shows the state inserted in (2), (c) is a perspective view which shows the state which returned each twist of each unit cable by separating the handle | steering-wheel of two hammers, twisting in the mutually opposite direction.

Explanation of symbols

K1, K2 ... Unit cable (other line)
K3 ... Unit cable (1 wire to detect voltage)
H ... Hammer 1 ... Untwisted rod 2 ... Taper 11 (11A, 11B) ... Untwisted state holding member 12 (12a, 12b) ... First fixing portion 13 (13a, 13b) ... Second fixing portion

Claims (11)

  A twisting tool for a power cable for unwinding a plurality of unit cables from a state in which the unit cables are integrally twisted, and separating one wire of the unit cable from the other wire, the twisting tool comprising: It is characterized by comprising a untwisting rod that is inserted between the unit cables that are twisted together to perform untwisting, and a untwisted state holding member that retains the untwisted state of each unit cable. Power cable twisting tool.   2. The power cable twist-back tool according to claim 1, wherein both ends of the twist-back bar are formed in a tapered shape so that the twist-back bar can easily enter between the twists of each unit cable.   The untwisting tool for a power cable according to claim 1 or 2, wherein the untwisting rod is formed of an electrically insulating material of wood, epoxy glass, or cloth bake.   The untwisted state holding member is a twisting tool for a power cable according to any one of claims 1 to 3, wherein the untwisted state holding member is formed of a fist-like block body.   The untwisted state holding member includes a first fixing portion that supports one wire of each unit cable on one end surface side of the block body, and a second fixing that supports the other wire of each unit cable on the other end surface side of the block body. A power cable twist-back tool according to any one of claims 1 to 4, further comprising: a portion.   6. The power use according to claim 1, wherein the first fixing portion of the untwisted state holding member is formed by a single recess, and the second fixing portion is formed by connecting a plurality of recesses. Cable twisting tool.   The untwisted state holding member is a twisting tool for a power cable according to any one of claims 1 to 6, wherein the untwisted state holding member is formed of a hard rubber having a hardness of about 70 °.   The unwinding tool for a power cable according to claim 7, wherein the hard rubber is urethane rubber.   A method for untwisting a power cable for unwinding a plurality of unit cables from a state in which the unit cables are integrally twisted and separating one of the unit cables from the other line, and each unit cable at a specific location Inserting a twistback rod between the twisted wires and untwisting each unit cable, and placing a twisted state holding member as a block body between each unit cable of the portion where the twist is returned; and , The step of moving the rear wall of the untwisted state holding member with a hammer and moving it forward, and placing another untwisted state holding member on the untwisted part so as to be back to back with the untwisted state holding member And a step of removing the untwisted rod and a step of hitting the rear wall of another untwisted state holding member with a hammer and moving it forward. Untwisted method Le.   A method for untwisting a power cable for unwinding a plurality of unit cables from a state in which the unit cables are integrally twisted and separating one of the unit cables from the other line, and each unit cable at a specific location Inserting a twistback rod between the twisted wires and untwisting each unit cable, and placing a twisted state holding member as a block body between each unit cable of the portion where the twist is returned; and , A step of moving the rear wall of the untwisted state holding member with a hammer and moving it forward, a step of extracting the untwisted rod, and inserting the untwisted rod at a predetermined distance from a specific location. The step of untwisting the unit cable and the other untwisted state holding member which is a block body between the unit cables of the part where the twist is returned, the above-described untwisted state holding member and the back A power cable comprising: a step of arranging in a twisted manner; a step of pulling out the untwisted rod; and a step of moving the rear wall of another untwisted state holding member forward with a hammer. Twisting method.   The step of arranging the untwisted state holding member, which is a block body, between the unit cables of the part where the twist has been returned includes supporting one wire of each unit cable in the recess of the first fixing portion of the untwisted state holding member, The method of twisting back a power cable according to claim 9 or 10, wherein the other wire of each unit cable is supported by the recessed portion provided continuously with the two fixing portions.

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