Trolley wire cutting method and trolley wire cutting jig

Abstract

To provide a cutting method and a cutting tool for cutting a trolley wire at a part in its longitudinal direction without damaging an abrasion detection wire housed in a groove for the abrasion detection wire of the trolley wire.SOLUTION: According to the present invention, there is provided a method of breaking a contact wire 2 formed with a groove for abrasion detecting wire 2526 for accommodating an optical fiber cable 30 as an abrasion detecting wire without breaking the optical fiber cable 30, comprising a slit forming step of forming a slit 201202 in a range from a 2a portion of an outer peripheral face of the contact wire 2 to a position which does not reach the groove for abrasion detecting wire 2526, and a pulling step of pulling the contact wire 2 in a longitudinal direction before and after the slit 201202 in the longitudinal direction of the contact wire 2 to break the contact wire 2 at a portion formed with the slit 201202. The cutting jig 5 has a pair of gripping parts 51,52 for gripping the trolley wire 2 in which the notch 201,202 is formed, and an opening mechanism 53 for widening an interval between the pair of gripping parts 51,52.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a method for cutting a contact wire that supplies power to an overhead electric railway vehicle, and to a contact wire cutting jig for cutting the contact wire. [Background technology]

[0002] Conventionally, the trolley wires that supply power to overhead electric railway vehicles are subject to mechanical wear due to sliding contact with the pantograph and electrical wear due to sparks, and therefore must be replaced when the wear reaches a predetermined value. To detect the wear of the trolley wires, trolley wires for Shinkansen trains, for example, are formed with grooves for wear detection wires that house optical fibers as wear detection wires. When the optical fiber housed in this groove breaks due to wear, it is detected that the wear of the trolley wire has reached the predetermined amount that requires replacement.

[0003] Patent Document 1 describes a cutting device for a trolley wire with a detection wire that cuts only the trolley wire without cutting the detection wire used to detect wear. The cutting device includes a trolley wire holding jig with a pair of trolley wire clamping parts that clamp the trolley wire, a cutter body, and a guide that guides the cutter body in a direction perpendicular to the longitudinal direction of the trolley wire clamped by the trolley wire holding jig. By moving the cutter body along the guide, cutting grooves of a predetermined depth are formed in the trolley wire clamped by the trolley wire holding jig from above and below in a direction perpendicular to the longitudinal direction of the trolley wire. Then, by bending the portion with the cutting grooves multiple times, the end of the trolley wire can be cut off without cutting the detection wire. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-99411 Summary of the Invention [Problem to be solved by the invention]

[0005] In the method of cutting a trolley wire using the cutting device described in Patent Document 1, when the end of the trolley wire is cut off by bending the part where the cutting groove is formed multiple times, if the cut end of the trolley wire shifts in a direction perpendicular to the longitudinal direction relative to the main body of the trolley wire (the strung part), there is a risk that the detection wire will be broken or damaged.

[0006] Therefore, the present invention aims to provide a cutting method and cutting tool for cutting a trolley wire in part of its longitudinal direction without damaging the wear detection wire housed in the trolley wire wear detection wire groove. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the present invention provides a cutting method for cutting a trolley wire having a wear detection wire groove formed therein to accommodate a wear detection wire without cutting the wear detection wire accommodated in the wear detection wire groove, the cutting method comprising: a notch forming step for forming a notch in an area from the outer surface of the trolley wire that does not reach the wear detection wire groove; and a pulling step for pulling the trolley wire longitudinally before and after the notch in the longitudinal direction of the trolley wire, thereby breaking the trolley wire at the location where the notch is formed.

[0008] In addition, with the aim of solving the above-mentioned problems, the present invention provides a cutting jig for cutting a trolley wire having a wear detection wire groove formed therein to accommodate a wear detection wire without cutting the wear detection wire accommodated in the wear detection wire groove, the cutting jig for trolley wire comprising a pair of gripping portions that grip the trolley wire, having a notch formed in it in an area from the outer surface of the trolley wire that does not reach the wear detection wire groove, before and after the notch in the longitudinal direction of the trolley wire, and a spacing mechanism that widens the gap between the pair of gripping portions. [Effects of the Invention]

[0009] According to the trolley wire cutting method and trolley wire cutting tool of the present invention, the trolley wire can be cut in part of its longitudinal direction without damaging the wear detection wire housed in the trolley wire wear detection wire groove. [Brief explanation of the drawings]

[0010] [Figure 1] 1A is a schematic diagram showing an example of the configuration of an overhead contact line including a contact wire, and FIG. 1B is a schematic diagram showing the state of the contact wire shown in FIG. 1A during overhead contact work. [Figure 2] (a) is a cross-sectional view of the contact wire, and (b) is a perspective view of the contact wire. [Figure 3] 10(a) and 10(b) are explanatory diagrams showing a trolley wire held by an ear fitting. [Figure 4] FIG. 10 is an explanatory diagram showing how a cut is made in a trolley wire with an electric saw. [Figure 5] FIG. 2 is a cross-sectional view showing the configuration of the cutting jig together with the trolley wire before it is cut. [Figure 6] 10 is a cross-sectional view showing the configuration of the cutting jig together with the trolley wire after being cut. FIG. [Figure 7] 10(a) and 10(b) are diagrams showing an example of the configuration of a pair of gripping parts of a cutting jig. [Figure 8] FIG. 10 is a diagram illustrating a configuration example of a cross-shaft gear mechanism of a cutting jig. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Embodiment Mode] FIG. 1(a) is a schematic diagram showing an example of the configuration of an overhead contact line including a trolley wire 2. FIG. 1(b) is a schematic diagram showing the state of the trolley wire 2 shown in FIG. 1(a) during overhead contact work. FIG. 2(a) is a cross-sectional view of the trolley wire 2. FIG. 2(b) is a perspective view showing the end of the trolley wire 2. The trolley wire 2 of this embodiment is a "trolley wire with optical fiber detection wire" that houses an optical fiber 30 as a wear detection wire.

[0012] The trolley wire 2 is strung in the space above a track 10 on which a train (not shown) runs. Here, as an example, a case where the strut configuration is a compound catenary type will be described. However, the strut configuration may also be a simple catenary type.

[0013] In the compound catenary system, an auxiliary catenary wire 13 is suspended from a catenary wire 11 by a dropper 12, and a contact wire 2 is suspended from the auxiliary catenary wire 13 by a hanger ear 14. The auxiliary catenary wire 13 and the contact wire 2 are fixed to one end of dead-end clamps 15 and 16, respectively, and the other ends of the dead-end clamps 15 and 16 are connected to a yoke fitting 19 via turnbuckles 17 and 18, respectively. The yoke fitting 19 plays a role in balancing the tension of the auxiliary catenary wire 13 and the contact wire 2.

[0014] A terminal fitting 41 is attached to the tip of the terminal portion of the trolley wire 2 fixed to the dead-end clamp 16. Inside the terminal fitting 41, an optical fiber 30 drawn out from the trolley wire 2 is connected to an optical fiber included in an optical cable 42 connected to a wire breakage detection system or the like.

[0015] In the final stage of the work of stringing the trolley wire 2, only the trolley wire 2 is cut without cutting the optical fiber 30, and the end portion 20 of the trolley wire 2 is separated over a length of about 1 m. In this embodiment, this work of cutting the trolley wire 2 is performed above the track 10 using a cutting jig 5, as shown in Figure 1(b). At this time, the main body portion of the trolley wire 2 (the portion not cut off by the cutting jig 5) remains in a stringing state.

[0016] The work of cutting the trolley wire 2 is a high-altitude job performed by two workers, one of whom operates the cutting jig 5 while supporting it, while the other supports the part of the trolley wire 2 to be cut. Once the trolley wire 2 is cut by the cutting jig 5, the other worker carefully removes the end portion of the trolley wire 2 so as not to damage the optical fiber 30, and leads out the optical fiber 30. The led-out optical fiber 30 is then connected inside the terminal fitting 41.

[0017] 3(a) and (b) are explanatory diagrams showing the trolley wire 2 held by a pair of ear fittings 141, 142 of the hanger ear 14. FIG. 3(a) shows the trolley wire 2 as viewed in the longitudinal direction, and FIG. 3(b) shows the trolley wire 2 as viewed horizontally from a direction perpendicular to the longitudinal direction. The ear fittings 141, 142 are attached to the lower end of the linear hanger 140 and have claws 141a, 142a, respectively, for clamping the trolley wire 2. Connecting plates 143, 144 are attached to the ear fittings 141, 142, and a bolt 145 that passes through the ear fittings 141, 142 and the connecting plates 143, 144 is threaded into a nut 146. The ear fittings 141, 142 hold the trolley wire 2 by the axial force of the bolt 145.

[0018] As shown in Figures 2(a) and 2(b), the trolley wire 2 is formed with a pair of ear grooves 21, 22 into which the claws 141a, 142a of the pair of ear fittings 141, 142 engage, a small arc surface 23 above the pair of ear grooves 21, 22, a large arc surface 24 below the pair of ear grooves 21, 22, and a pair of wear detection line grooves 25, 26 for accommodating an optical fiber 30. The shape of this trolley wire 2 corresponds to the shape of a grooved hard-copper trolley wire specified in JISE2101 or IEC62917. The trolley wire 2 is mainly composed of a copper alloy, for example, a Cu-Sn-In alloy or a Cu-Sn alloy. The small arc surface 23 and the large arc surface 24 are part of the outer circumferential surface 2a of the trolley wire 2.

[0019] The optical fiber 30 is housed in the wear detection line grooves 25, 26 of the trolley wire 2 in the form of an optical cable 3 covered with a resin sheath 31. In the manufacturing process of the trolley wire 2, the wear detection line grooves 25, 26 have openings 250, 260 closed by crimping after the optical cable 3 is housed therein, so that the optical cable 3 does not fall off.

[0020] When power is supplied to a train via the contact wire 2, the lower end of the large arc surface 24 of the contact wire 2 comes into contact with the train's current collector, such as a pantograph. This causes wear on the contact wire 2 mechanically due to friction with the current collector and electrically due to sparks. As wear on the contact wire 2 progresses, the optical fiber 30 breaks due to contact with the current collector, activating the wire breakage detection system, which detects that the contact wire 2 has worn down to near its limit of use.

[0021] More specifically, a single-mode optical fiber having a diameter of 0.9 mm or more and 1.1 mm or less can be used as the optical fiber 30. The nominal cross-sectional area of ​​the trolley wire 2 is, for example, 150 mm 2 (150SQ) or more and 175mm 2 (175SQ) or less. Here, the nominal cross-sectional area refers to the calculated cross-sectional area when it is assumed that the wear detection line grooves 25, 26 are not provided.

[0022] In this embodiment, as shown in Fig. 2(a), wear detection line grooves 25, 26 are provided on one side and the other side of the center line C2 of the trolley wire 2, and optical cables 3 are housed in the wear detection line grooves 25, 26, respectively. This makes it possible to properly detect wear of the trolley wire 2, for example, even when uneven wear occurs in the trolley wire 2 that is strung in a curved portion of the track 10.

[0023] Next, we will explain the cutting method and cutting jig 5 for cutting only the trolley wire 2 without cutting the optical fiber 30 housed in the wear detection wire grooves 25, 26. The method for cutting the trolley wire 2 includes a notch forming step of forming a notch in an area from the outer surface 2a of the trolley wire 2 to the wear detection wire grooves 25, 26, and a pulling step of pulling the trolley wire 2 in the longitudinal direction to break the trolley wire 2 at the location where the notch was formed.

[0024] The slit forming process and the pulling process are performed with a portion of the longitudinal direction of the trolley wire 2 in a suspended state, as shown in Fig. 1(b). In the pulling process, the trolley wire 2 is pulled in the longitudinal direction while another portion of the longitudinal direction of the trolley wire 2, including the portion where the slit was formed in the slit forming process, is tilted upward from the horizontal. The inclination angle θ of this other portion of the longitudinal direction of the trolley wire 2 with respect to the horizontal is 30° or more, for example 45°.

[0025] In the slit forming process, slits are formed in a range that includes both vertical ends of the trolley wire 2 when it is strung. In Figure 2(a), the trolley wire 2 is divided into three vertical layers, and the range where slits are formed in the slit forming process is shown with gray shading. In Figure 2(a), the range that includes the wear detection line grooves 25, 26 is called the middle range R0, the range above the middle range R0 is called the upper range R1, and the range below the middle range R0 is called the lower range R2. The middle range R0 is the range where slits are not formed, and the upper range R1 and lower range R2 are the ranges where slits are formed. The upper range R1 includes the upper end 27 of the trolley wire 2. The lower range R2 includes the lower end 28 of the trolley wire 2. As shown in Figure 2(a), when the overall width of the trolley wire 2 in the vertical direction is L0, the width of the upper range R1 is L1, and the width of the lower range R2 is L2, L1 is, for example, 50% or more of L0, and L2 is, for example, 8% or more of L0.

[0026] FIG. 4 is an explanatory diagram showing, as an example, a state in which a notch is being made in the upper range R1 using an electric saw 6. The electric saw 6 includes a circular saw blade 61 rotated by an electric motor, a blade guard 62 that partially covers the circumferential direction of the circular saw blade 61, a base 63 attached to the blade guard 62, a grip 64 that is held by an operator, and a switch 65 for operating the electric motor. FIG. 4 shows a state in which the base 63 is pressed against the upper end 27 of the trolley wire 2 to make a notch in the upper range R1. When making a notch in the lower range R2, the position of the base 63 is adjusted and the base 63 is pressed against the lower end 28 of the trolley wire 2. However, this is not limited thereto, and notches may be made in the upper range R1 and the lower range R2 using, for example, a guide member that holds the trolley wire 2 and guides the movement of the electric saw 6 relative to the trolley wire 2. Furthermore, the configuration of the power saw 6 is not limited to one that rotates the circular saw blade 61, but may be, for example, a reciprocating type in which the saw blade moves back and forth.

[0027] 5 and 6 are cross-sectional views showing the configuration of the cutting jig 5 together with the trolley wire 2. Fig. 5 shows the state before the trolley wire 2 is cut. Fig. 6 shows the state after the trolley wire 2 is cut. In the pulling process, the cutting jig 5 pulls the trolley wire 2 in the longitudinal direction before and after the longitudinal slit in the trolley wire 2, breaking the trolley wire 2 at the location where the slit was formed. Fig. 5 shows the slit 201 formed in the upper range R1 and the slit 202 formed in the lower range R2 in the slit forming process.

[0028] Hereinafter, the portion where the slits 201, 202 are formed in the longitudinal direction of the trolley wire 2 is referred to as the slit formation portion 200. The portion on the main body side (the wired side) of the slit formation portion 200 is referred to as one side, and the opposite side is referred to as the other side. The portion on the other side of the slit formation portion 200 is the end portion 20 of the trolley wire 2, which is the portion to be removed.

[0029] The cutting jig 5 has as its main components a pair of gripping parts 51, 52 that grip the trolley wire 2 before and after the slit formation portion 200 in the longitudinal direction of the trolley wire 2, a spacing mechanism 53 that widens the gap between the pair of gripping parts 51, 52, a skew gear mechanism 54 that inputs power to the spacing mechanism 53 to operate the spacing mechanism 53, and a base 55. One of the pair of gripping parts 51, 52, grips the trolley wire 2 closer to the main body than the slit formation portion 200. The other gripping part 52 grips the end portion 20 of the trolley wire 2. Hereinafter, the one gripping part 51 may be referred to as the first gripping part 51, and the other gripping part 52 may be referred to as the second gripping part 52.

[0030] Fig. 7(a) is a diagram showing an example of the configuration of the first gripping unit 51. Fig. 7(b) is a diagram showing an example of the configuration of the second gripping unit 52. The up-down direction in Figs. 7(a) and 7(b) corresponds to the up-down direction in the vertical direction when the pulling process is performed.

[0031] The first holding unit 51 has a support 511 having a U-shaped shape when viewed from the longitudinal direction of the trolley wire 2, a top plate 513 fixed to the top of the support 511 by a plurality of bolts 512, a fastening member 514 having a male threaded portion 514a that screws into a female threaded hole 513a formed in the top plate 513 and a handle portion 514b that is operated by an operator, and a contact member 515 that is pressed by the fastening member 514 to contact the upper end 27 of the trolley wire 2. The support 511 has a pair of legs 511a, 511b and a base 511c with which the lower end 28 of the trolley wire 2 contacts. The trolley wire 2 is sandwiched between the contact member 515 and the base 511c of the support 511 by the fastening force of the fastening member 514, and is fixed to the first holding unit 51.

[0032] The second holding portion 52 is also configured in the same manner as the first holding portion 51, and includes a support 521 having a pair of legs 521a, 521b and a base 521c, a top plate portion 523 fixed above the support 521 by a plurality of bolts 522, a fastening member 524 having a male threaded portion 524a that screws into a female threaded hole 523a formed in the top plate portion 523 and a handle portion 524b that is operated by an operator, and an abutment member 525 that is pressed by the fastening member 524 and abuts against the upper end portion 27 of the trolley wire 2.

[0033] In this embodiment, spacing mechanism 53 is configured by a ball screw mechanism. Spacing mechanism 53 has ball screw nut 531, ball screw shaft 532 to which ball screw nut 531 is screwed, and a plurality of balls 533 interposed between ball screw nut 531 and ball screw shaft 532. Spiral grooves 531a and 532a in which balls 533 roll are formed in ball screw nut 531 and ball screw shaft 532, respectively. The plurality of balls 533 roll in a circulating manner through circulation path 531b formed in ball screw nut 531.

[0034] One end of the ball screw shaft 532 is rotatably supported by a first bearing 56, and the other end is rotatably supported by a second bearing 57. In the configuration example shown in FIGS. 5 and 6, the first bearing 56 is a single-row ball bearing, and the second bearing 57 is a double-row angular contact ball bearing. The first bearing 56 is held by a first bearing holder 581 having an outer ring 561 fixed to the base 55, and one end of the ball screw shaft 532 is inserted into the inner ring 562. The second bearing 57 is held by a second bearing holder 582 having an outer ring 571 fixed to the base 55, and the other end of the ball screw shaft 532 is inserted into the inner ring 572.

[0035] Axial movement of the ball screw shaft 532 relative to the base 55 is restricted by a flange portion 532b provided on the ball screw shaft 532 and a nut 583 that screws onto a male thread 532c formed on the ball screw shaft 532, sandwiching an inner ring 572 of the second bearing 57 in the axial direction. A guide rail 550 that guides movement of the ball screw nut 531 along the axial direction of the ball screw shaft 532 is provided on the base 55. Rotation of the ball screw nut 531 around the ball screw shaft 532 is restricted by the guide rail 550.

[0036] The first gripping portion 51 is fixed to a pedestal 59 fixed to a base 55. The second gripping portion 52 is fixed to a ball screw nut 531. When the ball screw shaft 532 rotates around the central axis as shown by arrow A in FIG. 5 , the ball screw nut 531 moves together with the second gripping portion 52 in a direction away from the first gripping portion 51. As a result, the trolley wire 2 between the first gripping portion 51 and the second gripping portion 52 is pulled in the longitudinal direction, and the trolley wire 2 is broken and cut at the slit formation portion 200, which is a weak portion between the first gripping portion 51 and the second gripping portion 52.

[0037] 8 is a structural diagram showing an example of the configuration of the non-intersecting shaft gear mechanism 54 that rotates the ball screw shaft 532 about its central axis. In this embodiment, the non-intersecting shaft gear mechanism 54 is configured by a worm gear mechanism. Note that the non-intersecting shaft gear is a general term for gears used between axes that are neither parallel nor intersecting, and in addition to worm gears, cross-section shaft gears also include screw gears and hypoid gears.

[0038] In the present embodiment, the cross-shaft gear mechanism 54 includes a worm wheel 541 spline-fitted to one end of the ball screw shaft 532, and a worm gear shaft 542 meshing with the worm wheel 541. The worm wheel 541 rotates integrally with the ball screw shaft 532 about the central axis C of the ball screw shaft 532. When the cutting jig 5 is viewed in the vertical direction, the rotation axis O of the worm gear shaft 542 is perpendicular to the central axis C of the ball screw shaft 532, but the central axis C of the ball screw shaft 532 and the rotation axis O of the worm gear shaft 542 are offset in the vertical direction. The worm gear shaft 542 integrally includes a shaft portion 542a rotatably supported by a pair of arms 551, 552 provided on the base 55, and a gear portion 542b meshing with the worm wheel 541 between the pair of arms 551, 552.

[0039] 8, a shaft 543a of a handle 543 that is rotated by an operator is connected to the worm gear shaft 542. A lever 543b is attached to the outer peripheral end of the handle 543 to facilitate the operator's rotation. When the operator rotates the handle 543, the rotation of the handle 543 is slowed down by the cross-shaft gear mechanism 54, and the ball screw shaft 532 rotates at a lower rotational speed than the handle 543. In other words, the cross-shaft gear mechanism 54 functions as a reducer that amplifies the rotational torque of the handle 543.

[0040] Furthermore, as shown in FIG. 8, the diameter of the handle 543 is larger than the diameter of the worm gear shaft 542. However, as described above, when the cutting jig 5 is viewed from above, the rotation axis O of the worm gear shaft 542 is perpendicular to the central axis C of the ball screw shaft 532. Therefore, the handle 543 does not interfere with the base 55, etc., and the handle 543 can be made larger in diameter to apply a large rotational torque to the worm gear shaft 542.

[0041] Instead of the handle 543, the worm gear shaft 542 may be rotated by a rotary power tool such as an electric drill or an electric screwdriver. In this case, the rotation shaft of the power tool is connected to the worm gear shaft 542. Even in this case, when the cutting jig 5 is viewed from above, the rotation axis O of the worm gear shaft 542 is perpendicular to the central axis C of the ball screw shaft 532, so that it is possible to prevent the power tool from interfering with the base 55 or the like.

[0042] After cutting the trolley wire 2, the cut end portion 20 is removed from the second gripping part 52 to expose the portion of the optical cable 3 that was housed in the end portion 20. Thereafter, the optical fiber 30 of the exposed portion of the optical cable 3 is connected to the optical fiber of the optical cable 42 inside the terminal fitting 41 as shown in FIG.

[0043] As described with reference to FIG. 1(b), the pulling process using the cutting jig 5 is performed with part of the longitudinal direction of the trolley wire 2 tilted upward from the horizontal. Therefore, when the trolley wire 2 is cut at the slit formation portion 200, the end portion 20 of the trolley wire 2 is prevented from rotating due to its own weight in a direction perpendicular to the longitudinal direction around the part held by the second holding portion 52. This is because the weight of the end portion 20 is supported by the second holding portion 52 at a rate corresponding to the inclination angle θ. In other words, if the end portion 20 is horizontal when the trolley wire 2 is cut, a high proportion of the weight of the end portion 20 acts to rotate around the part held by the second holding portion 52, which would easily damage the optical cable 3. However, by cutting the trolley wire 2 at an angle as described above, the rotation of the end portion 20 can be suppressed.

[0044] In order to facilitate breaking of the trolley wire 2, the trolley wire 2 with the slits 201 and 202 formed therein may be bent multiple times around the slit formation portion 200 before being attached to the cutting jig 5, thereby causing metal fatigue in the intermediate range R0 (see Figure 2(a)), which is the portion between the slits 201 and 202. This bending operation must be performed carefully so as not to break the trolley wire 2. By causing metal fatigue in the portion between the slits 201 and 202, the trolley wire 2 can be cut more easily.

[0045] (Actions and Effects of the Embodiments) According to the embodiment described above, it is possible to cut only the trolley wire 2 without damaging the optical fiber 30 housed in the wear detection wire grooves 25, 26. Furthermore, since the trolley wire 2 is broken by pulling it before and after the slit formation portion 200, even if burrs are generated at the broken portion, it is easy to prevent the optical fiber 30 from being damaged by the burrs.

[0046] (Summary of the embodiment) Next, the technical ideas grasped from the above-described embodiments will be described by using the reference numerals and the like in the embodiments. However, the reference numerals in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiments.

[0047] [1] A cutting method for cutting a trolley wire (2) having a wear detection line groove (25, 26) formed therein for accommodating a wear detection line (optical fiber 30) without cutting the wear detection line (30) accommodated in the wear detection line groove (25, 26), the cutting method comprising: a notch forming step for forming notches (201, 202) in an area from the outer surface (2a) of the trolley wire (2) not reaching the wear detection line groove (25, 26); and a pulling step for pulling the trolley wire (2) in the longitudinal direction before and after the notches (201, 202) in the longitudinal direction of the trolley wire (2), thereby breaking the trolley wire (2) at the location where the notches (201, 202) are formed.

[0048] [2] A method for cutting a trolley wire as described in [1] above, in which in the notch forming process, the notches (201, 202) are formed in a range (R1, R2) including both vertical ends (upper end 27 and lower end 28) of the trolley wire (2) when it is strung.

[0049] [3] In the pulling process, the trolley wire (2) is pulled in the longitudinal direction using a jig (cutting jig 5) having a pair of gripping portions (51, 52) that grip the trolley wire (2) before and after the notches (201, 202) in the longitudinal direction of the trolley wire (2), and a spacing mechanism (53) that widens the gap between the pair of gripping portions (51, 52). This is the trolley wire cutting method described in [1] above.

[0050] [4] A method for cutting a trolley wire as described in [1] to [3] above, wherein the incision forming process and the pulling process are carried out with a portion of the longitudinal direction of the trolley wire (2) suspended, and in the pulling process, the trolley wire (2) is pulled in the longitudinal direction with another portion of the longitudinal direction of the trolley wire (2) including the portion where the incisions (201, 202) are formed (incision forming portion 200) tilted upward from the horizontal.

[0051] [5] A cutting jig (5) for cutting a trolley wire (2) having a wear detection line groove (25, 26) formed therein to accommodate a wear detection line (30) without cutting the wear detection line (30) accommodated in the wear detection line groove (25, 26), the cutting jig (5) for trolley wire comprising: a pair of gripping portions (51, 52) for gripping the trolley wire (2) having a notch (201, 202) formed in a range from the outer surface (2a) of the trolley wire (2) not reaching the wear detection line groove (25, 26) in front of and behind the notch (201, 202) in the longitudinal direction of the trolley wire (2), and a spacing mechanism (53) for widening the gap between the pair of gripping portions (51, 52).

[0052] [6] The trolley wire cutting jig (5) described in [5] above, wherein the spacing mechanism (53) has a ball screw nut (531) that moves together with one of the pair of gripping portions (51, 52) of the pair of gripping portions (51, 52), and a ball screw shaft (532) to which the ball screw nut (531) is threaded, and the one of the gripping portions (52) moves relative to the other gripping portion (51) as the ball screw shaft (532) rotates.

[0053] [7] The trolley wire cutting jig (5) described in [6] above, wherein the spacing mechanism (53) further has a cross-shaft gear mechanism (54) that rotates the ball screw shaft (532) around its central axis (C).

[0054] Although the embodiments of the present invention have been described above, the invention according to the claims is not limited to the above embodiments. It should be noted that not all of the combinations of features described in the embodiments are necessarily essential to the means for solving the problems of the invention. [Explanation of symbols]

[0055] 2...Contact wire 200...Notch formation area 201, 202...Notches 25, 26...Groove for wear detection line 27…Top end 28…Bottom end 2a...Outer surface 30...Optical fiber 5...Cutting jig 51, 52...Gripping portion 53... Spacing mechanism 531... Ball screw nut 532...Ball screw shaft 54...Intersecting shaft gear mechanism

Claims

1. A cutting method for cutting a trolley wire having a wear detection line groove formed therein, without cutting the wear detection line accommodated in the wear detection line groove, comprising: a notch forming step of forming a notch in a range from the outer peripheral surface of the trolley wire to the wear detection line groove; a pulling process in which the trolley wire is pulled in a longitudinal direction before and after the slit in the longitudinal direction of the trolley wire, thereby breaking the trolley wire at the portion where the slit is formed; A method for cutting a contact wire comprising the steps of:

2. In the slit forming step, the slit is formed in a range including both ends in the up-down direction when the contact wire is strung. The method for cutting a trolley wire according to claim 1.

3. In the pulling process, the trolley wire is pulled in the longitudinal direction using a jig having a pair of gripping portions that grip the trolley wire before and after the slit in the longitudinal direction of the trolley wire and a spacing mechanism that widens the gap between the pair of gripping portions. The method for cutting a trolley wire according to claim 1.

4. The slit forming step and the pulling step are performed in a state where a part of the contact wire in the longitudinal direction is strung, In the pulling step, the trolley wire is pulled in the longitudinal direction while another part of the longitudinal direction of the trolley wire, including the part where the slit is formed, is tilted upward from horizontal. A method for cutting a trolley wire according to any one of claims 1 to 3.

5. A cutting jig for cutting a trolley wire having a wear detection line groove formed therein for accommodating a wear detection line without cutting the wear detection line accommodated in the wear detection line groove, a pair of gripping portions configured to grip the trolley wire in front of and behind the slit in the longitudinal direction of the trolley wire, the trolley wire having a slit formed in a range from the outer peripheral surface of the trolley wire that does not reach the wear detection wire groove; a spacing mechanism that widens the gap between the pair of gripping portions; A contact wire cutting jig equipped with the above.

6. the spacing mechanism includes a ball screw nut that moves together with one of the pair of gripping portions, and a ball screw shaft to which the ball screw nut is screwed, and the one gripping portion moves relative to the other gripping portion as the ball screw shaft rotates. The trolley wire cutting jig according to claim 5.

7. The spacing mechanism further includes a skew gear mechanism that rotates the ball screw shaft about its central axis. The trolley wire cutting jig according to claim 6.

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