Re-covering method

Abstract

This invention provides a power line replacement method that eliminates the need for remodeling of structures such as utility poles, reduces the cost of replacing power lines, and shortens the construction period. [Solution] The replacement method according to the present invention is a replacement method for replacing a feeder wire (hereinafter referred to as "old feeder wire 10") that is stretched across multiple utility poles with a new feeder wire (hereinafter referred to as "new feeder wire 10'"), and is characterized in that, in the step before replacing the old feeder wire 10 with the new feeder wire 10', a construction pulley 100 equipped with a pair of rotating clamping plates that revolve and a wheel that rotates on its own axis between the rotating clamping plates is attached to multiple utility poles.

Description

[Technical Field]

[0001] This invention relates to a method for replacing old power lines with new power lines. [Background technology]

[0002] Various methods are known for replacing overhead catenary wires, such as feeder wires and trolley wires, from old to new. For example, Patent Document 1 (Japanese Patent No. 3377557) discloses a method using a catenary wire replacement device that stops at each span of the catenary wire, removes and retrieves the old catenary wire from the suspension wire, and then attaches the new catenary wire to the suspension wire, and moves sequentially along the track.

[0003] The following describes the power line replacement method implemented by the applicant, with reference to Figures 26 to 35. Figures 26 to 35 illustrate a power line replacement method for replacing power lines 10 (hereinafter also referred to as "old power lines") that are strung across multiple utility poles 1 with new power lines 10' (hereinafter also referred to as "new power lines").

[0004] First, with reference to Figure 26, the schematic diagram used in this specification to describe the replacement method will be explained. Figure 26(A) schematically shows feeder wires 10 stretched across multiple utility poles 1, trolley wires 3 that are electrically connected to the feeder wires 10 and receive power from the feeder wires 10, and a suspension wire 2 that suspends the trolley wires 3. Hereafter in the drawings, in order to distinguish between multiple utility poles 1, P n The following notations will be used as appropriate. In addition, tools such as clamps and rail-road vehicles that enable work at heights will be used as appropriate in the process of carrying out the re-covering method, but these tools and rail-road vehicles will not be shown in the illustrations.

[0005] Figure 26(B) is a schematic representation of the specific configuration related to the electrical connection in Figure 26(A), with the suspension wire 2 omitted from Figure 26(A). A feeder wire branching device 2 is used for this electrical connection. In the feeder wire branching device 2, the branch line 6 and the feeder wire 10 are fixed together by a branch fitting 21, thereby realizing the electrical connection. In the following drawings, in order to avoid making the diagrams too complex, the suspension wire 2, trolley wire 3, and feeder wire branching device 22 may be omitted from the illustrations.

[0006] Figure 27 shows the situation before the conventional replacement method was implemented. The following explanation is based on an example in which the feeder wires 10 between utility poles 1 labeled P2 to P6 are replaced with new feeder wires 10'. Note that this replacement section is merely an example and not an actual example. An actual replacement section would correspond to several hundred meters in distance.

[0007] Furthermore, the process of replacing the feeder lines 10 must be carried out primarily outside of train operating hours, that is, during the time between the last and first trains, when power supply to the feeder lines 10 can be stopped. It should be noted that some of the processes described below are carried out over multiple days, and the entire process cannot be completed in a single day.

[0008] In the process shown in Figure 28, pulleys 11 are attached to the utility poles 1 from P2 to P6 for cable extension, and temporary guy wires 7 (shown by dashed lines) are attached to the utility poles 1 of P2 and P6. Between the processes shown in Figures 31 to 33, both the load of the old cable 10 and the load of the new cable 10' are applied, so a force acts on the utility pole 1 of P2 to try to tip P2 to the left side of the page, and on the utility pole 1 of P6 to try to tip P6 to the right side of the page. The temporary guy wires 7 are used to resist these forces.

[0009] In the subsequent step shown in Figure 29, a wire rope 8 (indicated by a dashed line) is stretched across each pulley 11. Weights 9 are attached to the ends of the wire ropes 8 to prevent them from sagging. At this point, the train can be operated commercially.

[0010] In the process shown in Figure 30, a feeding vehicle 18 equipped with a feeding drum 19 for feeding out a new feeder wire 10' (indicated by a dashed line) and a winding vehicle 16 equipped with a winding drum 17 for winding up the wire extension rope 8 are prepared. Also, in Figure (a), the wire extension rope 8 and the new feeder wire 10' are connected. Furthermore, the left end of the wire extension rope 8 is attached to the winding drum 17 so that it is wound up by the winding drum 17.

[0011] In the process shown in Figure 31, the extension rope 8 is wound onto the winding drum 17, and the new power supply wire 10' is fed out from the feed drum 19. The new power supply wire 10' is fed out until it reaches position (b).

[0012] In the subsequent step shown in Figure 32, the feeder line branching device 20, which was not shown in the previous steps, is attached to the new feeder 10'. The new feeder 10' and the branch line 6 are attached by compressing a new sleeve-shaped branch fitting 21.

[0013] In the process shown in Figure 33, electrical connections are made between the existing feeder wire 10 and the new feeder wire 10' at positions (c) and (d). The old feeder wire 10 to be replaced is temporarily secured at positions (e) and (f), etc.

[0014] In the process shown in Figure 34, the tension of the old electric wire 10, which was temporarily fixed at positions (e) and (f) in Figure 33, is reduced, and then it is cut to an appropriate length and removed. Then, in the process shown in Figure 35, the pulleys 11 attached to each utility pole 1 are removed, completing the replacement of the old electric wire 10 with the new electric wire 10'. [Patent Document 1] Patent No. 3377557 [Overview of the project] [Problems that the invention aims to solve]

[0015] In the conventional wire replacement method described above, during the steps shown in Figures 31 to 33, the weight of both the old and new power lines 10' is applied to the utility poles 1 at P2 to P6. If the strength of the utility poles 1 at P2 to P6 is insufficient, it may be necessary to renovate the poles at P2 to P6 to improve their strength as a preliminary step before replacing the old power line 10 with the new power line 10'. Such renovations increase the cost of replacing the power lines and prolong the construction period. Furthermore, in recent years, securing workers has also become difficult, which has been a problem.

[0016] Furthermore, the processes shown in Figures 30 to 35 must be carried out as a series of steps during the time when power supply to the feeder line 10 is stopped, between the last train and the first train of the day. In other words, the work of replacing the old feeder line 10 with the new feeder line 10', the work of installing the feeder line branching device 20 on the new feeder line 10', and the work of removing the old feeder line 10 must all be carried out in one night. However, the schedule becomes too tight to complete all of these tasks, which was a problem. [Means for solving the problem]

[0017] To solve these problems, the replacement method according to the present invention is a replacement method for replacing feeder wires (hereinafter referred to as "old feeder wires") that are strung across multiple utility poles with new feeder wires (hereinafter referred to as "new feeder wires"), characterized in that, in the step before replacing the old feeder wires with new feeder wires, a construction pulley equipped with a pair of revolving rotating clamping plates and a wheel that rotates on its own axis between the rotating clamping plates is attached to multiple utility poles.

[0018] Furthermore, the wire replacement method according to the present invention is characterized by including a step, prior to replacing the old wire with a new wire, of replacing the branch fitting of the wire branching device attached to the old wire with a temporary branch fitting.

[0019] Furthermore, the wire replacement method according to the present invention is characterized in that, in the process of replacing an old wire with a new wire, the process includes connecting the old wire and the new wire and pulling out the old wire to replace the old wire with the new wire.

[0020] In addition, the rewiring method according to the present invention is characterized in that, in the process of rewiring from an old electric wire to a new electric wire, the process of removing the temporary branch fitting from the old electric wire is included.

Advantages of the Invention

[0021] Since the rewiring method according to the present invention includes a step of attaching a plurality of construction trolleys 100, which are provided with a pair of rotating clamping plates that revolve and a wheel that rotates between the rotating clamping plates, to a plurality of utility poles in the step before rewiring from the old electric wire 10 to the new electric wire 10', it becomes possible to perform construction by a pulling-out method in which the old electric wire 10 and the new electric wire 10' are connected and pulled out. Since the loads of the old electric wire 10 and the new electric wire 10' do not act on a structure such as a utility pole 1 at the same time, modification of the structure such as the utility pole 1 is not required, the cost for rewiring the electric wire can be suppressed, and the construction period can be shortened.

[0022] In addition, according to the rewiring method according to the embodiment of the present invention using the "temporary branch fitting 1000", the attachment work of the electric wire branching device 20 becomes easy, so it becomes possible to have a margin in the work schedule.

Brief Description of the Drawings

[0023] [Figure 1] It is a diagram for explaining the rewiring method according to the present invention. [Figure 2] It is a diagram for explaining the rewiring method according to the present invention. [Figure 3] It is a diagram for explaining the rewiring method according to the present invention. [Figure 4] It is a diagram for explaining the rewiring method according to the present invention. [Figure 5] It is a diagram for explaining the rewiring method according to the present invention. [Figure 6] It is a diagram for explaining the rewiring method according to the present invention. [Figure 7] It is a diagram for explaining the construction trolley 100 used in the rewiring method according to the present invention. [Figure 8]This is a perspective view of a construction pulley 100 used in the re-covering method according to the present invention. [Figure 9] This is a transparent perspective view of a part of the frame 120 and other components of a construction pulley 100 used in the re-covering method according to the present invention. [Figure 10] This diagram illustrates the position of the wheel 140 when a power feeder wire 10, which is not equipped with any obstacles S such as sleeves, is being transported by a construction pulley 100. [Figure 11] This diagram illustrates the transport of a power feeder line 10 by a construction pulley 100 used in the power line replacement method according to the present invention. [Figure 12] This diagram illustrates the seesaw motion of the construction pulley 100 according to the present invention. [Figure 13] This diagram illustrates the load on the power feeder wire 10, including the obstacle S, acting on each rotating body holding structure 130. [Figure 14] This is a transparent perspective view of a part of the frame 120 and other components of a construction pulley 100 according to another embodiment. [Figure 15] This is a perspective view of a wheel 150 with a textured surface used in a construction pulley 100 according to another embodiment. [Figure 16] This diagram illustrates the transport of wire 10 by a construction pulley 100 according to another embodiment. [Figure 17] This is an exploded perspective view of the temporary branch fitting 1000 used in the re-covering method according to the present invention. [Figure 18] This is a perspective view of the main body member 1300 of the temporary branch fitting 1000 used in the re-covering method according to the present invention. [Figure 19] This figure shows a cross-section of the main body member 1300 at a position midway between the left and right sides. [Figure 20] This is a perspective view of the first wedge member 1100 of the temporary branch fitting 1000 used in the re-covering method according to the present invention. [Figure 21] This is a perspective view of the second wedge member 100 of the temporary branch fitting 1000 used in the re-covering method according to the present invention. [Figure 22]These are a top view (A), a left side view (B), and a front view (C) of the temporary branch fitting 1000 used in the re-covering method according to the present invention. [Figure 23] This is a perspective view of a temporary branch fitting 1000 used in the re-covering method according to the present invention. [Figure 24] These are top view (A) and left side view (B) of the main body member 1300, first wedge member 1100, and second wedge member 100 of the temporary branch fitting 1000 used in the re-covering method according to the present invention. [Figure 25] This is a perspective view showing how the branch line 6 and the electric wire 10 are connected using the temporary branch fitting 1000 used in the wire replacement method according to the present invention. [Figure 26] This is a schematic diagram used to explain the re-covering method. [Figure 27] This is a diagram illustrating the conventional method of replacing roofing. [Figure 28] This is a diagram illustrating the conventional method of replacing roofing. [Figure 29] This is a diagram illustrating the conventional method of replacing roofing. [Figure 30] This is a diagram illustrating the conventional method of replacing roofing. [Figure 31] This is a diagram illustrating the conventional method of replacing roofing. [Figure 32] This is a diagram illustrating the conventional method of replacing roofing. [Figure 33] This is a diagram illustrating the conventional method of replacing roofing. [Figure 34] This is a diagram illustrating the conventional method of replacing roofing. [Figure 35] This is a diagram illustrating the conventional method of replacing roofing. [Modes for carrying out the invention]

[0024] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figures 1 to 6 illustrate the replacement method according to the present invention. The same drawing method used for these figures as for conventional replacement methods will be used. In addition, Figures 1 to 6 will be explained based on an example in which the feeder wires 10 between utility poles 1 labeled P2 to P6 are replaced with new feeder wires 10'.

[0025] The wire replacement method according to the present invention realizes construction by a pull-out method that connects the old wire 10 and the new wire 10' and pulls them out. For this purpose, a construction pulley 100 is used, which is equipped with at least a pair of rotating clamping plates that revolve and a wheel that rotates on its own axis between the rotating clamping plates. Figure 1 shows the construction pulley 100 attached to the utility poles 1 from P2 to P6. At this time, the old wire 10 is passed through the construction pulley 100. That is, the old wire 10 is placed on the wheel 140 and intermediate roller 170, which will be described later.

[0026] In order to pass the old electric wire 10 through the construction pulley 100, the fastening members connecting the suspension structure 110 and the frame 120 (or 120') are temporarily removed, the old electric wire 10 is placed on the wheel 140 or intermediate roller 170, and then the suspension structure 110 and the frame 120 (or 120') are fastened again with the fastening members. The suspension structure 110, frame 120, and frame 120' will be described later.

[0027] Next, the construction pulley 100 used in the re-covering method according to the present invention will be described. Figure 7 is a diagram illustrating the construction pulley 100 used in the re-covering method according to the present invention. Figure 7(A) is a side view of the construction pulley 100. When the construction pulley 100 used in the re-covering method according to the present invention is used in re-covering work by the pull-out method, the construction pulley 100 viewed from the side in the direction of travel of the train (not shown) will be as shown in Figure 7(A).

[0028] Figure 7(B) is a diagram showing the main rotating components installed inside the construction pulley 100. Note that the vertical rollers 180 of the construction pulley 100 are also rotating components, but are not shown in Figure 7(B). Figure 7(B) also shows the construction pulley 100 from the side. Hereafter, unless otherwise specified, the materials constituting the construction pulley 100 are rigid materials such as metal.

[0029] Figure 8 is a perspective view of the construction pulley 100 used in the re-covering method according to the present invention, and Figure 9 is a transparent perspective view of some of the components of the construction pulley 100 used in the re-covering method according to the present invention, such as the frame 120. When illustrating the construction pulley 100 in Figure 8 and subsequent drawings, fastening members such as bolts and nuts are omitted, and instead, an axis passing through the center of such fastening members is shown. Also, please note that in Figure 8 and subsequent drawings, some components are omitted from the drawing for the sake of clarity of the feeder wire 10 passing between the frames 120 and 120'.

[0030] The construction pulley 100 is suitable for use as a pulley when guiding the power lines 10 during power line installation work (especially power line replacement work), but its use is not limited to this. The construction pulley 100 has two sets of rotating body holding structures 130 and a plurality of intermediate rollers 170 provided between them as its main rotating elements. These configurations are shown in Figure 7(B). In the construction pulley 100, these rotating elements are designed to support the load of the power lines 10.

[0031] The two sets of rotating body holding structures 130 and the multiple intermediate rollers 170 are rotatably held by a pair of frames 120 and 120'. Each frame 120 and 120' is provided with multiple through holes for supporting each axis. With this structure, the two sets of rotating body holding structures 130 and the multiple intermediate rollers 170 rotate relative to the pair of frames 120 and 120' around their axes.

[0032] The feeder wire 10 is transported on two sets of rotating body holding structures 130, which are rotatably mounted between a pair of frames 120, 120', and on a plurality of intermediate rollers 170 provided between them.

[0033] A single rotating body holding structure 130 includes a pair of rotating clamping plates 135, 135' that rotate around a certain axis (hereinafter referred to as the "first axis 131"), and a plurality of rotating bodies that are rotatably held between the pair of rotating clamping plates 135, 135' around a plurality of axes 141 parallel to the first axis 131.

[0034] In the construction pulley 100, a wheel 140 with no irregularities on its outer circumference can be used as the rotating body held between a pair of rotating clamping plates 135, 135'. The wheel 140 can be made of a material such as rubber, which has a shaft hole through which a bolt and nut, which will serve as the shaft 141, is inserted. The wheel 140 provided in the rotating body holding structure 130 is of the same specifications in terms of dimensions, etc. Furthermore, the two sets of rotating body holding structures 130 as a whole are of the same specifications.

[0035] Each of the rotating clamping plates 135 and 135' is provided with multiple through holes for supporting each axis. With this structure, the wheel 140 rotates relative to the pair of rotating clamping plates 135 and 135' around its axis.

[0036] Focusing on the wheel 140, the wheel 140 rotates relative to the pair of rotating clamping plates 135 and 135' (this rotation is also called "rotation"). In addition, as the pair of rotating clamping plates 135 and 135' rotate, the wheel 140 rotates around the axis of the rotating clamping plates 135 and 135' (the same as the first axis 131 of the rotating body holding structure 130) (this rotation is also called "revolution").

[0037] In the construction pulley 100, the number of wheel 140s clamped by the pair of rotating clamping plates 135, 135' is five, but there are no particular restrictions as long as the number of wheel 140s clamped by the pair of rotating clamping plates 135, 135' is three or more.

[0038] The axes 141 that serve as the rotation centers of each wheel 140 in a single rotating body holding structure 130 are arranged at equal intervals around the first axis 131 of the rotating clamping plates 135 and 135'. The arrangement of the axes 141 arranged at equal intervals around the first axis 131 is shown in the rotating clamping plates 135 and 135' on the right side of Figure 7(B). In Figure 7(B), the circumferential distance C between adjacent axes 141 is all equal.

[0039] The intermediate roller 170 is held by a pair of frames 120 and 120' so that it can rotate around an axis 171 parallel to the first axis 131. Furthermore, all of the intermediate rollers 170 are of the same specifications, and all of the intermediate rollers 170 are held by the frames 120 and 120' so that they are flush with each other.

[0040] In the construction pulley 100, the intermediate roller 170 can be made of, for example, a cylindrical base material having a shaft hole through which a bolt and nut, which serve as a shaft 171, is inserted, and a flexible material such as rubber provided around the outer circumference of the cylindrical base material.

[0041] In this embodiment, there are five intermediate rollers 170 provided between the two sets of rotating body holding structures 130, but there is no particular restriction on the number of intermediate rollers 170 provided. In short, it is sufficient for a group of multiple intermediate rollers 170 between the two sets of rotating body holding structures 130 to be configured to adequately support the load of the feeder wire 10, including obstacles S such as sleeves.

[0042] When comparing the diameter of the wheel 140 used in the rotating body holding structure 130 (the diameter when the wheel 140 is viewed as a right cylindrical column) with the diameter of the intermediate roller 170 (the diameter when the intermediate roller 170 is viewed as a right cylindrical column), the diameter of the former is larger than the diameter of the latter. One reason for this is to reduce the overall weight of the construction pulley 100 by making the intermediate roller 170 lighter.

[0043] Furthermore, when comparing the maximum height of the wheel 140 used in the rotating body holding structure 130 with the height of the multiple intermediate rollers 170 which are flush with the surface, the former is set to be higher than the latter. The difference in height between the two is shown as D in Figure 7(B). One reason for this setting is to ensure that when the feeder wire 10 is being transported, the load of obstacles S such as sleeves lifted by the rotating body holding structure 130 on the inlet side is supported by the multiple intermediate rollers 170.

[0044] On the other hand, when the power supply wire 10 in a location where no obstacles S such as sleeves are attached is transported by the construction pulley 100, the dimensional relationship between the intermediate rollers 170 and the wheel wheels 140 in the rotating body holding structure 130 is determined such that the intermediate rollers 170 and two of the wheel wheels 140 in each rotating body holding structure 130 [the two wheel wheels 140 at the highest height out of the multiple (five in this example) wheel wheels 140] are flush (see Figure 10). In the construction pulley 100, because of this dimensional relationship, the power supply wire 10 without obstacles S is transported smoothly on a perfectly flat surface.

[0045] In the construction pulley 100, the feeder wire 10 enters from one of the two rotating body holding structures 130, and exits from the other rotating body holding structure 130, as the feeder wire 10 is transported. In this transported feeder wire 10, the rotating body holding structure 130 on the upstream side in the direction of travel is sometimes referred to as the inlet rotating body holding structure 130, and the rotating body holding structure 130 on the downstream side is sometimes referred to as the outlet rotating body holding structure 130.

[0046] In each of the two sets of rotating body holding structures 130 that make up the construction pulley 100, a pair of vertical rollers 180 are arranged opposite each other on the side where the intermediate roller 170 is not provided. These vertical rollers rotate around a second shaft 182 perpendicular to the first shaft 131. In other words, a total of four vertical rollers 180 are provided in one construction pulley 100.

[0047] The vertical rollers 180 are rotatably mounted to the vertical roller holding structure 127. The vertical roller holding structure 127 is mounted on the left and right sides of each frame 120 and 120' as seen in Figure 7. By providing pairs of vertical rollers 180 on both the inlet and outlet sides of the construction pulley 100, it is possible to restrict the meandering of the feeder wire 10 in the left-right direction perpendicular to the direction of travel.

[0048] A suspension structure 110 is attached to the top of each frame 120, 120'. This suspension structure 110 suspends rotating elements such as rollers that transport the power supply wires 10, which are installed in the frames 120, 120' of the construction pulley 100, from the insulators 8, etc.

[0049] The suspension structure 110 is provided with a pair of transponders 112 and 112', and suspension holes 113 and 113' are provided in the central part of each transponder 112 and 112'. Holes for mounting accessories such as insulators 8 are placed in the space between the transponders 112 and 112', and fastening members such as bolts and nuts are inserted through these holes and the suspension holes 113 and 113', so that the construction pulley 100 is suspended from the insulators 8 and the like.

[0050] In this specification, the central axis of the fastening members such as bolts and nuts used to suspend the construction pulley 100 is referred to as the pivot shaft 111. The construction pulley 100 is designed to rotate around this pivot shaft 111. As illustrated in Figure 7(A), the entire construction pulley 100 rotates in directions (a) and (b). The pivot shaft 111 is also parallel to the first shaft 131.

[0051] In the construction pulley 100, a virtual plane (a plane perpendicular to the plane of paper containing x-x' in Figure 7(A)) is formed at an equidistant midpoint from the first axis 131 of each of the two sets of rotating body holding structures 130. The pivot shaft 111 is positioned within this virtual plane parallel to the first axis 131.

[0052] The basic configuration of the construction pulley 100 is mirror-symmetric with respect to the aforementioned virtual plane. That is, the construction pulley 100 is weight-equal on both sides of the virtual plane. The suspension structure 110 of the frames 120 and 120' of the construction pulley 100 rotates around the pivot shaft 111, but in the absence of external force, it becomes balanced on both sides and remains stationary in an equilibrium state as shown in Figure 7.

[0053] Next, the transport of the power feeder wire 10 by the construction pulley 100 configured as described above will be explained with reference to Figure 11. In Figure 11, (A) to (E) show the order of passage of time. Also, in Figure 11, the power feeder wire 10 is shown moving from right to left on the page. Tension is acting on the power feeder wire 10 in the direction of the arrow by a winding machine or the like (not shown).

[0054] Obstacles S, such as sleeves, are attached to the feeder wire 10, and there is a risk of the obstacles S getting caught, especially when passing through the construction pulley 100. Figure 11(A) shows how the obstacles S attached to the feeder wire 10 enter the rotating body holding structure 130 on the inlet side of the construction pulley 100.

[0055] In this case, the leading edge of the obstacle S may ride up onto the wheel 140 of the rotating body holding structure 130, allowing the power line 10 to move forward solely by the rotation (self-rotation) of the wheel 140. On the other hand, the leading edge of the obstacle S may hit the wheel 140 of the rotating body holding structure 130, preventing the power line 10 from moving forward solely by the rotation (self-rotation) of the wheel 140.

[0056] In such cases, as shown in Figure 11(A) → Figure 11(B), the construction pulley 100 is designed so that snagging can be prevented by the wheel 140 revolving around the first axle 131.

[0057] If, in the state shown in Figure 11(A), the leading edge of the obstacle S hits the wheel 140 of the rotating body holding structure 130 and the resulting force overcomes the tension, then, as shown in Figure 12, the entire construction pulley 100 acts like a seesaw (the left side of the paper goes up and the right side goes down) around the pivot shaft 111, causing the leading edge of the obstacle S to overcome the wheel 140 and the obstacle S to be released from being stuck at P. In this way, the construction pulley 100 can significantly reduce the rate at which snags occur during the transport of the feeder wire 10, thus avoiding a decline in the work efficiency of the extraction method.

[0058] When the obstacle S attached to the feeder wire 10 overcomes the wheel 140 of the rotating body holding structure 130 on the inlet side, the feeder wire 10 then moves forward as shown in Figure 11(C) → Figure 11(D), with the load of the feeder wire 10 and the obstacle S supported by the intermediate roller 170. The obstacle S, whose load is supported by the intermediate roller 170, then enters the rotating body holding structure 130 on the outlet side, overcomes it, and exits the construction pulley 100. However, the possibility of the obstacle S getting caught in the rotating body holding structure 130 on the outlet side is very small compared to the possibility of it getting caught in the rotating body holding structure 130 on the inlet side. This will be explained with reference to Figure 13.

[0059] Figure 13(A) shows the load on the inlet-side rotating body holding structure 130, and Figure 13(B) shows the load on the outlet-side rotating body holding structure 130. At the wheel 140 of the inlet-side rotating body holding structure 130, where the obstacle S strikes, a load W1 is applied to Q. This load W1 is due to the gravity of the obstacle S and the electric wire 10 to the right of Q in the plane of the paper, and is of a considerable magnitude.

[0060] On the other hand, referring to Figure 13(B), a load W2 is applied to R on the wheel 140 of the rotating body holding structure 130 on the outlet side when the obstacle S strikes it. Since a portion of the gravity of the obstacle S and the electric wire 10 is supported by the intermediate roller 170, the load W2 on R is significantly reduced compared to the load W1 on Q on the inlet side. As a result, the possibility of the obstacle S getting caught in the rotating body holding structure 130 on the outlet side is very small. Thus, with the construction pulley 100, because multiple intermediate rollers 170 are provided, it is possible to reduce the rate at which snagging occurs during the transport of the electric wire 10.

[0061] As shown in Figures 11(D) to 11(E), the obstacle S attached to the feeder line 10 will be transported by passing through the rotating body holding structure 130 on the exit side.

[0062] As described above, the construction pulley 100 has two sets of rotating body holding structures 130, each containing multiple rotating bodies (wheels 140), and multiple intermediate rollers 170 that rotate around multiple axes 171 parallel to the first axis 131 are arranged between the two sets of rotating body holding structures 130. With such a construction pulley 100, even if obstacles S such as sleeves are provided on the power supply line 10, the rate of snagging during the transport of the power supply line 10 can be significantly reduced, and a decline in the work efficiency of the extraction method can be avoided.

[0063] Furthermore, the construction method using the construction pulley 100 significantly reduces the rate at which obstacles S such as sleeves cause snagging when replacing the feeder wires 10, thus avoiding a decline in the work efficiency of the pull-out method.

[0064] Next, another embodiment of the construction pulley 100 will be described. The following description will focus on the differences from the previous embodiment. Figure 14 is a transparent perspective view of some of the components, such as the frame 120, of the construction pulley 100 according to another embodiment.

[0065] In the construction pulley 100 according to another embodiment, a wheel 150 with actively formed irregularities on its outer circumference is used as the rotating body held between a pair of rotating clamping plates 135, 135'. This wheel 150 is set to rotate about an axis 151 parallel to the first axis 131.

[0066] Figure 15 is a perspective view of a wheel 150 with irregularities used in a construction pulley 100 according to another embodiment. The wheel 150 can be made up of, for example, a substantially cylindrical base material 154 through which a shaft hole 155 is provided, through which a bolt and nut, which serve as an axle 151, is inserted. Multiple mounting recesses 156 are provided around the outer circumference of the base material 154, and a convex member 158 is fixed to each of these mounting recesses 156.

[0067] Next, the transport of the power feeder wire 10 by the construction pulley 100 configured as described above, according to another embodiment, will be explained with reference to Figure 16. Figure 16(A)→(B) shows how the obstacle S passes through the rotating body holding structure 130 on the inlet side. Also, Figure 16 shows the power feeder wire 10 moving from right to left on the page. Tension is acting on the power feeder wire 10 in the direction of the arrow by a winding machine or the like (not shown).

[0068] In the construction pulley 100 according to another embodiment, as the feeder wire 10 moves forward, an obstacle S attached to the feeder wire 10 comes into contact with the convex member 158 of the wheel 150 in the rotating body holding structure 130 on the inlet side (Figure 16(A)). In this way, the wheel 150 is pushed by the obstacle S, and the wheel 150 of the rotating body holding structure 130 on the inlet side revolves (Figure 16(B)). Thus, in the construction pulley 100 according to the second embodiment, by providing irregularities on the outer circumference of the wheel 150, the rotation of the wheel 150 is actively promoted, thereby preventing snagging of obstacles S and the like.

[0069] According to the construction pulley 100 of the other embodiment described above, even if obstacles S such as sleeves are provided on the feeder wire 10, the rate at which snagging occurs during the transport of the feeder wire 10 can be significantly reduced, and a decline in the work efficiency of the extraction method can be avoided.

[0070] Furthermore, in the construction pulley 100 according to another embodiment, a wheel 150 with irregularities is used to actively cause the wheel 150 to revolve, thereby preventing snagging during the transport of the power line 10.

[0071] Furthermore, according to the construction method using the pulley 100 of another embodiment, the rate at which the feeder wire 10 gets caught on obstacles S such as sleeves can be significantly reduced when replacing the feeder wire 10, and a decline in the work efficiency of the pull-out method can be avoided.

[0072] In the above explanation, we described an example of using the construction pulley 100 to guide electric wires during electric wire installation using the pull-out method. However, the use of the construction pulley 100 is not limited to this, and it can also be used, for example, in the installation of optical fibers for communications.

[0073] Furthermore, while the construction pulley 100 is primarily suitable for use in methods involving the replacement of electric wires, it can be used in other construction methods as well. For example, the construction pulley 100 can also be used for construction work such as laying new electric wires.

[0074] Now, in the process shown in Figure 2, following Figure 1, the branch fitting 21 of the power supply branching device 20 that was attached to the old power supply line 10 is replaced with a temporary branch fitting 1000. Such a temporary branch fitting 1000 makes it possible to mechanically fix the old power supply line 10 (or the new power supply line 10') and the branch line 6 without compressing a sleeve-shaped metal member. Using such a temporary branch fitting 1000 has the advantage that train operations can be continued in the state shown in Figure 2, and that the temporary branch fitting 1000 can be used on the day the old power supply line 10 is replaced with the new power supply line 10', allowing the compression work on the metal member to be carried out at a later date, thus providing more flexibility in the construction schedule.

[0075] Next, the temporary branch fitting 1000 used in the wire replacement method according to the present invention will be described. Figure 17 is an exploded perspective view of the temporary branch fitting 1000 used in the wire replacement method according to the present invention. The temporary branch fitting 1000 connects power feeder wires made of hard copper stranded wire, hard aluminum stranded wire, etc., electrically and mechanically, and is intended to be used for straight connections and branch connections.

[0076] The temporary branch fitting 1000 will be explained using the example of connecting a feeder wire 10 and a branch wire 6 of different diameters, but it is also acceptable to use two fittings of the same diameter.

[0077] Furthermore, the temporary branch fitting 1000 has a cross-sectional area of ​​300 mm². 2 Branch line 6, with a cross-sectional area of ​​510 mm² 2 The explanation will use the example of connecting to the eaves wire 10, but the combination of wire diameters connected with the temporary branch fitting 1000 is arbitrary. The temporary branch fitting 1000 has a cross-sectional area of, for example, 200 mm². 2 The wire has a cross-sectional area of ​​325 mm². 2 It may also be used to connect to the electric wires.

[0078] In this specification, branch line 6 has a cross-sectional area of ​​300 mm². 2 The feeder wire 10 has a cross-sectional area of ​​510 mm². 2However, the terms "1st" and "2nd" attached to the feeder wires do not indicate any particular order or anything like that, but are simply terms used to distinguish between different types of feeder wires.

[0079] The temporary branch fitting 1000 consists of a main body member 1300, a first wedge member 1100 inserted into the main body member 1300 from a predetermined direction, and a second wedge member 1200 inserted into the main body member 1300 from a direction opposite to the predetermined direction. The materials that make up the main body member 1300, the first wedge member 1100, and the second wedge member 1200 can be alloys mainly composed of copper, such as chromium copper, or alloys mainly composed of aluminum.

[0080] As shown in Figure 17, the first wedge member 1100 is inserted into the main body member 1300 at arrow a, and the second wedge member 1200 is inserted into the main body member 1300 at arrow b, thereby holding, clamping, and fixing the branch line 6 and the power line 10 between the main body member 1300 and each wedge member, and connecting the respective power lines.

[0081] Here, we define directions and other terms used in this specification. When viewing the temporary branch fitting 1000 in the direction of arrow a (the direction in which the first wedge member 1100 is inserted into the main body member 1300), this is defined as being viewed from the "front". Furthermore, the top and bottom relationships are defined as follows: the side in which the first wedge member 1100 is inserted into the main body member 1300 is "up," and the side in which the second wedge member 1200 is inserted into the main body member 1300 is "down." Accordingly, "front," "back," "top," "bottom," "left side," and "right side" are defined as shown in Figure 17.

[0082] Figure 18 is a perspective view of the main body member 1300 of the temporary branch fitting 1000 used in the re-covering method according to the present invention, and Figure 19 is a cross-section of the main body member 1300 at an intermediate position between the left and right sides. Figure 20 is a perspective view of the first wedge member 1100 of the temporary branch fitting 1000 used in the re-covering method according to the present invention, and Figure 21 is a perspective view of the second wedge member 1200 of the temporary branch fitting 1000 used in the re-covering method according to the present invention.

[0083] Furthermore, Figures 22 and 23 show the state in which the first wedge member 1100 and the second wedge member 1200 are assembled to the main body member 1300 in a temporary assembly. Figure 22 is a top view (A), left side view (B), and front view (C) of the temporary branch fitting 1000 used in the re-covering method according to the present invention. Figure 23 is a perspective view of the temporary branch fitting 1000 used in the re-covering method according to the present invention.

[0084] The first wedge member 1100 will be described, mainly with reference to Figure 20. The first wedge member 1100 consists of three parts, in order from bottom to top as seen in Figure 20: the first wire holding part 1130, the first main part 1110, and the first striking height-extension part 1150.

[0085] The upper surface of the first main part 1110 is provided with a first wire diameter indicator section 1113 that can be referenced when assembling the first wedge member 1100 to the main body member 1300. In this embodiment, the cross-sectional area of ​​the branch wire 6 is 300 mm². 2 The number "300" is provided to indicate this. Two types of wedge members are attached to the main body member 1300, and since the first wire diameter indicator section 1113 is provided, it is possible to visually confirm which wedge member is temporarily attached to the main body member 1300, or whether the correct wedge member is being used during the actual construction.

[0086] A first insertion depth indicator 1115 is further provided on the upper surface of the first main part 1110. This first insertion depth indicator 1115 is an arrow-shaped mark and is referenced in correspondence with the first reference position indicator 1325, which is an opposing arrow-shaped mark provided on the main body member 1300. When the first wedge member 1100 is installed, as seen in Figure 17, it is inserted into the main body member 1300 in the direction of arrow a. At this time, it can be confirmed that the installation has been performed correctly by ensuring that the position indicated by the first insertion depth indicator 1115 of the first wedge member 1100 is the same as, or exceeds, the position indicated by the first reference position indicator 1325 of the main body member 1300.

[0087] Furthermore, the first main part 1110 is provided with a first through hole 1140 that penetrates from one side to the other. It is assumed that a retaining cotter pin (not shown) will be inserted through this first through hole 1140 to prevent the first wedge member 1100 from falling out of the main body member 1300 after the first wedge member 1100 has been inserted.

[0088] On the lower side of the first wire holding portion 1130, a first wire holding surface 1137 is provided that holds and fixes the branch wire 6 between itself and the main body member 1300, along the longitudinal direction of the first wedge member 1100 (the same as the insertion direction of the wedge member). This first wire holding surface 1137 has a concave shape that the branch wire 6 follows, and a first wire holding strip 1138 is provided for holding the branch wire 6. The first wire holding strip 1138 may have a concave or convex cross-section; the important thing is that it can efficiently grip the branch wire 6. Furthermore, the first wire holding strip 1138 is provided so as to extend in a direction perpendicular to the longitudinal direction.

[0089] The first wire retaining strip 1138 is provided on the first wire retaining surface 1137 to increase the grip between the first wedge member 1100 and the branch wire 6. On the other hand, on the main body member 1300 side, such retaining strips are deliberately not provided on the first wire clamping surface 1337 that holds and fixes the branch wire 6. In the temporary branch fitting 1000 used in the wire replacement method according to the present invention, since the first wire clamping surface 1337 does not have retaining strips, the first wedge member 1100 can be smoothly inserted into the main body member 1300.

[0090] The two upper surfaces of the first wire holding portion 1130 (the surfaces located on both sides of the first main portion 1110) are provided with first horizontal sliding contact surfaces 1132. When the first wedge member 1100 is inserted into the main body member 1300, the first horizontal sliding contact surfaces 1132 slide against the first main body side horizontal sliding contact surface 1332 on the main body member 1300 side as the first wedge member 1100 enters the main body member 1300. To ensure ease of entry at this time, it is preferable that only the first horizontal sliding contact surface 1132 is polished. That is, when considering the first wedge member 1100, it is preferable that the surface roughness of the first horizontal sliding contact surface 1132 is lower than the surface roughness of the other surfaces of the first wedge member 1100.

[0091] The two lower surfaces of the first wire holder 1130 (the surfaces located on either side of the first wire holder surface 1137) are provided with first inclined surfaces 1134. The first inclined surfaces 1134 are designed so that the height of the first wire holder 1130 decreases in the direction in which the first wedge member 1100 is inserted. The surface on the main body member 1300 side that abuts the first inclined surface 1134 is the first main body side inclined surface 1334. As shown in Figure 19, this first main body side inclined surface 1334 is angled upward to the left in the direction in which the first wedge member 1100 is inserted. In Figure 19, the dashed line indicates the position where the upper part of the branch line 6 is expected to be located. As the first wedge member 1100 is inserted into the main body member 1300 while the first inclined surface 1134 and the first main body side inclined surface 1334 are in contact, the space in which the branch wire 6 is placed shrinks in diameter, thereby firmly clamping and fixing the branch wire 6 between the first wedge member 1100 and the main body member 1300.

[0092] The first striking height-enlarged portion 1150 is a part that is thickened in the height direction relative to the first main portion 1110, and is provided as a part that can be struck with a hammer or the like by the installer when inserting the first wedge member 1100 into the main body member 1300. In this way, in the temporary branch fitting 1000 used in the re-covering method of the present invention, installation can be easily performed by striking the first striking height-enlarged portion 1150 with a hammer or the like, and furthermore, the first wedge member 1100 can be firmly fixed to the main body member 1300, improving the reliability of the connection between electric wires.

[0093] The upper surface of the first striking height-enhancing section 1150 is provided with a first insertion direction indicator 1153 to make it easier for the installer to understand the insertion direction of the first wedge member 1100. While an arrow-shaped mark would be easily intuitively understood for this first insertion direction indicator 1153, any mark is acceptable. The upper surface of the first main section 1110 and the upper surface of the first striking height-enhancing section 1150 are connected by a first connecting slope 1151.

[0094] Next, the second wedge member 1200 will be described mainly with reference to FIG. 21. The second wedge member 1200 is composed of three parts, namely, a second wire holding portion 1230, a second main portion 1210, and a second staking raised portion 1250, in order from bottom to top as viewed in FIG. 21.

[0095] On the upper surface of the second main portion 1210, a second wire diameter identification portion 1213 that can be referred to when assembling the second wedge member 1200 to the main body member 1300 is provided. In the case of this embodiment, as this second wire diameter identification portion 1213, the characters "510" representing the cross-sectional area 510 mm 2 of the live wire 10 are provided. Two types of wedge members can be assembled to the main body member 1300. Since such a second wire diameter identification portion 1213 is provided, it is possible to visually confirm which wedge member is temporarily assembled to the main body member 1300, or whether the construction is being carried out with the correct wedge member during this construction, and so on.

[0096] On the upper surface of the second main portion 1210, a second insertion depth identification portion 1215 is further provided. This second insertion depth identification portion 1215 is a mark in the shape of an arrow, and is referred to in correspondence with a second reference position identification portion 1425 (not shown, arranged at a position symmetric to the first reference position identification portion 1325) which is an arrow-shaped mark provided on the main body member 1300. When constructing, as viewed in FIG. 17, the second wedge member 1200 is inserted into the main body member 1300 in the direction of arrow b. At this time, by ensuring that the position indicated by the second insertion depth identification portion 1215 of the second wedge member 1200 is the same as or exceeds the position indicated by the second reference position identification portion 1425 of the main body member 1300, it is possible to confirm that the appropriate construction has been completed.

[0097] Furthermore, a second through hole 1240 penetrating from one side surface to the other side surface is provided in the second main portion 1210. It is assumed that a split pin (not shown) for preventing the second wedge member 1200 from falling off the main body member 1300 after the insertion of the second wedge member 1200 is inserted into this second through hole 1240.

[0098] On the lower side of the second wire holding portion 1230, a second wire holding surface 1237 is provided that holds and fixes the feeder wire 10 between the main body member 1300 and the second wedge member 1200, along the longitudinal direction of the second wedge member 1200 (the same as the insertion direction of the wedge member). This second wire holding surface 1237 has a concave shape that the feeder wire 10 follows, and a second wire holding strip 1238 for holding the feeder wire 10 is provided. The second wire holding strip 1238 may have a concave or convex cross-section; the important thing is that it can efficiently grip the feeder wire 10. Furthermore, the second wire holding strip 1238 is provided so as to extend in a direction perpendicular to the longitudinal direction.

[0099] The second wire retaining strip 1238 is provided on the first wire retaining surface 1137 to increase the grip between the second wedge member 1200 and the wire 10. On the other hand, on the main body member 1300 side, such retaining strips are deliberately omitted from the second wire clamping surface 1437 that holds and fixes the feeder wire 10. In the temporary branch fitting 1000 used in the wire replacement method according to the present invention, since the second wire clamping surface 1437 does not have retaining strips, the second wedge member 1200 can be smoothly inserted into the main body member 1300.

[0100] The two upper surfaces of the second wire holding portion 1230 (the surfaces located on both sides of the second main portion 1210) are provided with second horizontal sliding contact surfaces 1232. When the second wedge member 1200 is inserted into the main body member 1300, the second horizontal sliding contact surface 1232 slides against the second main body side horizontal sliding contact surface 1432 on the main body member 1300 side as the second wedge member 1200 enters the main body member 1300. To ensure ease of entry at this time, it is preferable that only the second horizontal sliding contact surface 1232 is polished. That is, when considering the second wedge member 1200, it is preferable that the surface roughness of the second horizontal sliding contact surface 1232 is lower than the surface roughness of the other surfaces of the second wedge member 1200.

[0101] The two lower surfaces of the second wire holder 1230 (the surfaces located on either side of the second wire holder surface 1237) are provided with second inclined surfaces 1234. The second inclined surfaces 1234 are designed so that the height of the second wire holder 1230 decreases in the direction in which the second wedge member 1200 is inserted. The surface on the main body member 1300 side that abuts the second inclined surface 1234 is the second main body side inclined surface 1434. As shown in Figure 19, this second main body side inclined surface 1434 is angled upward to the left in the direction in which the second wedge member 1200 is inserted. In Figure 19, the dashed line indicates the position where the lower part of the feeder wire 10 is expected to be located. As the second wedge member 1200 is inserted into the main body member 1300 while the second inclined surface 1234 and the second main body side inclined surface 1434 are in contact, the space in which the feeder wire 10 is arranged shrinks in diameter, thereby firmly clamping and fixing the feeder wire 10 between the second wedge member 1200 and the main body member 1300.

[0102] The second striking height-enlarged portion 1250 is a part that is thickened in the height direction relative to the second main portion 1210, and is provided as a part that can be struck with a hammer or the like by the installer when inserting the second wedge member 1200 into the main body member 1300. In this way, in the temporary branch fitting 1000 used in the re-covering method according to the present invention, installation can be easily performed by striking the second striking height-enlarged portion 1250 with a hammer or the like, and furthermore, the second wedge member 1200 can be firmly fixed to the main body member 1300, improving the reliability of the connection between electric wires.

[0103] The upper surface of the second striking height-enhancing section 1250 is provided with a second insertion direction indicator 1253 to make it easier for the installer to understand the insertion direction of the second wedge member 1200. While an arrow-shaped mark would be easily intuitively understood for this second insertion direction indicator 1253, any mark is acceptable. The upper surface of the second main section 1210 and the upper surface of the second striking height-enhancing section 1250 are connected by a second connecting slope 1251.

[0104] Next, the main body member 1300 will be described, mainly with reference to Figures 17 to 19. The upper and lower surfaces of the main body member 1300 are each provided with slit-shaped openings. The opening on the upper side is related to the first wedge member holding portion 1310 for holding the branch line 6 and the first wedge member 1100, and the opening on the lower side is related to the second wedge member holding portion 1410 for holding the feeder line 10 and the second wedge member 1200.

[0105] The first wedge member holding portion 1310 is composed of two parts: the first main part clamping portion 1320 and the first electric wire clamping portion 1330. The first main part clamping portion 1320 is the portion through which the first main part 1110 of the first wedge member 1100 is inserted. Furthermore, a first reference position recognition portion 1325 is provided on the upper surface of the first main part clamping portion 1320, corresponding to the first insertion depth recognition portion 1115 of the first wedge member 1100.

[0106] The first wire clamping portion 1330 is the portion through which the branch wire 6 is inserted between the first wire holding portion 1130 of the first wedge member 1100. The first wire clamping portion 1330 has a concave first wire clamping surface 1337 that receives the branch wire 6. The branch wire 6 is fixed by clamping it between this first wire clamping surface 1337 and the first wire holding surface 1137 of the first wedge member 1100.

[0107] Furthermore, the first wire clamping portion 1330 has a first body-side horizontal sliding contact surface 1332. The first body-side horizontal sliding contact surface 1332 is the portion to which the first horizontal sliding contact surface 1132 of the first wedge member 1100 slides when the first wedge member 1100 is inserted into the body member 1300.

[0108] Furthermore, the first wire clamping portion 1330 has a first main body-side inclined surface 1334. The first main body-side inclined surface 1334 is the portion that the first inclined surface 1134 of the first wedge member 1100 contacts when the first wedge member 1100 is inserted into the main body member 1300.

[0109] The second wedge member holding portion 1410 is composed of two parts: the second main part clamping portion 1420 and the second wire clamping portion 1430. The second main part clamping portion 1420 is the portion through which the second main part 1210 of the second wedge member 1200 is inserted. In addition, a second reference position indicator portion 1425 (not shown) is provided on the lower surface of the first main part clamping portion 1320, corresponding to the second insertion depth indicator portion 1215 of the second wedge member 1200.

[0110] The second wire clamping portion 1430 is the part through which the feeder wire 10 is inserted between the second wire holding portion 1230 of the second wedge member 1200. The second wire clamping portion 1430 has a concave second wire clamping surface 1437 that receives the feeder wire 10. The feeder wire 10 is fixed by clamping it between this second wire clamping surface 1437 and the second wire holding surface 1237 of the second wedge member 1200.

[0111] Furthermore, the second wire clamping portion 1430 has a second main body side horizontal sliding contact surface 1432. The second main body side horizontal sliding contact surface 1432 is the portion where the second horizontal sliding contact surface 1232 of the second wedge member 1200 slides against when the second wedge member 1200 is inserted into the main body member 1300.

[0112] Furthermore, the second wire clamping portion 1430 has a second main body-side inclined surface 1434. The second main body-side inclined surface 1434 is the portion that the second inclined surface 1234 of the second wedge member 1200 contacts when the second wedge member 1200 is inserted into the main body member 1300.

[0113] Next, the connection of the branch line 6 and the electric wire 10 using the temporary branch fitting 1000 used in the re-covering method according to the present invention, which is configured as described above, will be explained with reference to Figures 24 and 25. Figure 24 is a top view (A) and a left side view (B) of the main body member 1300, the first wedge member 1100, and the second wedge member 1200 of the temporary branch fitting 1000 used in the re-covering method according to the present invention. Figure 25 is a perspective view showing the connection of the branch line 6 and the electric wire 10 using the temporary branch fitting 1000 used in the re-covering method according to the present invention.

[0114] In Figure 24(B), the dashed line with one dot represents branch line 6, and the dashed line with two dots represents feeder line 10. Note that the feeder line is not shown in Figure 24(A), which is a top view.

[0115] In the installation of connecting the branch wire 6 and the power wire 10 using the power wire connection fitting 1, first, the branch wire 6 is inserted through the first power wire clamping portion 1330 of the main body member 1300, and the power feeder wire 10 is inserted through the second power wire clamping portion 1430.

[0116] Next, as shown in Figure 24(B), the first wedge member 1100 is inserted into the main body member 1300 in the direction of arrow a, while being aligned with the branch line 6. Similarly, the second wedge member 1200 is inserted into the main body member 1300 in the direction of arrow b, while being aligned with the feeder wire 10.

[0117] Next, the first striking expansion portion 1150 of the first wedge member 1100 is struck with a hammer or the like in the same direction as indicated by the first insertion direction indicator portion 1153, and it is confirmed that the first insertion depth indicator portion 1115 is at least in the same position as the first reference position indicator portion 1325 of the main body member 1300, or that the first insertion depth indicator portion 1115 has exceeded the first reference position indicator portion 1325 of the main body member 1300. Then, a cotter pin (not shown) is inserted through the first through hole 1140 to prevent the first wedge member 1100 from coming loose.

[0118] Similarly, the second striking heightened portion 1250 of the second wedge member 1200 is struck with a hammer or the like in the same direction as indicated by the second insertion direction indicator portion 1253, and it is confirmed that the second insertion depth indicator portion 1215 is at least in the same position as the second reference position indicator portion 1425 (not shown; see the case of the first reference position indicator portion 1325, which has a similar marking) of the main body member 1300, or that the second insertion depth indicator portion 1215 has exceeded the second reference position indicator portion 1425 (not shown) of the main body member 1300, and a cotter pin (not shown) is inserted through the second through hole 1240 to prevent the second wedge member 1200 from coming loose.

[0119] The temporary branch fitting 1000 used in the wire replacement method according to the present invention has a first wedge member 1100 with a first striking expansion portion 1150 at the end opposite to the end through which it is inserted into the main body member 1300, and a second striking expansion portion 1250 at the end opposite to the end through which it is inserted into the main body member 1300. With this temporary branch fitting 1000 used in the wire replacement method according to the present invention, construction can be easily performed by striking the first striking expansion portion 1150 and the second striking expansion portion 1250 with a hammer or the like. Furthermore, the first wedge member 1100 and the second wedge member 1200 can be firmly fixed to the main body member 1300, improving the reliability of the connection between the electric wires.

[0120] Now, following Figure 2, the process shown in Figure 3 is a preliminary step to replacing the old feeder wire 10 with the new feeder wire 10'. A feeder vehicle 18 equipped with a feeder drum 19 for feeding out the new feeder wire 10' (indicated by a dashed line) and a winding vehicle 16 equipped with a winding drum 17 for winding up the old feeder wire 10 are prepared. In addition, as a preliminary preparation for replacing the old feeder wire 10 with the new feeder wire 10', the temporary branch fitting 1000 in the feeder wire branching device 20 is removed, and the branch line 6 and the old feeder wire 10 are separated.

[0121] In the process shown in Figure 4 below, the old wire 10 is cut at position (a) and the old wire 10 is connected to the new wire 10'. Also, the old wire 10 is cut at position (b) and the pull-out rope 28 (shown by the dashed line) is connected to the old wire 10. The end of the pull-out rope 28 that is not connected to the old wire 10 is attached to the winding drum 17.

[0122] The process shown in Figure 5 is the actual procedure for replacing the old power line 10 with the new power line 10' using the pulling method. In the process shown in Figure 5, the pulling rope 28 and the old power line 10 are wound up by the winding drum 17, while the new power line 10' is fed out from the feed drum 19. The new power line 10' is fed out until it reaches position (b).

[0123] With the extraction method shown in Figure 5, the weight of both the old feeder wire 10 and the new feeder wire 10' does not simultaneously rest on structures such as utility pole 1. Therefore, it is not necessary to carry out repairs to the structure before replacing the feeder wires.

[0124] In the process shown in Figure 6, the existing feeder wire and the new feeder wire 10' are connected at positions (c) and (d) using a metal sleeve-shaped member or the like. Furthermore, the new feeder wire 10' and the branch wire 6 are connected at position (e) using a branch fitting 21. Note that, to avoid an overly tight construction schedule, it is not always necessary to perform the branch fitting 21, which requires compression work, on the day the extraction method is implemented. The new feeder wire 10' and the branch wire 6 may be connected using a temporary branch fitting 1000, and the branch fitting 21 may be performed at a later date.

[0125] In the process shown in Figure 6, the connection using a metal sleeve-shaped member at positions (c) and (d) was explained as an example. However, if it is necessary to omit compression work, etc., on the day the extraction method is performed, it is also possible to connect the existing feeder wire and the new feeder wire 10' using the feeder wire connector disclosed in Japanese Patent Application Publication No. 2013-157261.

[0126] In the process shown in Figure 6, the removal of the construction pulley 100 completes the method of replacing the old power line 10 with the new power line 10'.

[0127] In this specification, the temporary branch fitting 1000 is described as a fitting for temporarily connecting the branch line 6 and the feeder line 10 (10'). However, the temporary branch fitting 1000 can also be used as a fitting for permanently connecting the branch line 6 and the feeder line 10 (10').

[0128] As described above, the replacement method according to the present invention includes a step of attaching a construction pulley 100, equipped with a pair of revolving clamping plates and a wheel that rotates between the revolving clamping plates, to multiple utility poles in the step before replacing the old power line 10 with a new power line 10'. Therefore, it becomes possible to perform the work using a pull-out method that connects and pulls out the old power line 10 and the new power line 10'. Since the loads of the old power line 10 and the new power line 10' are not simultaneously applied to structures such as utility poles 1, there is no need to renovate structures such as utility poles 1, the cost of replacing the power lines can be reduced, and the construction period can be shortened.

[0129] Furthermore, according to the replacement method of the present invention using the "temporary branch fitting 1000," the installation work of the feeder line branching device 20 becomes easier, making it possible to allow more time in the work schedule.

[0130] In the embodiments described above, the explanation was based on an example of replacing one old electric wire 10 with one new electric wire 10'. However, the replacement method according to the present invention can also be used when replacing two or more old electric wires 10 with two or more new electric wires 10'. In this case, it is preferable to use the "wire laying tool" disclosed in Japanese Patent Application Publication No. 2004-72808. By using such a wire laying tool, both the old electric wire 10 and the new electric wire 10' can be properly passed through the construction pulley 100.

[0131] Furthermore, the present invention is not limited to the embodiments described above, and can be implemented with various modifications without departing from the spirit of the invention. All of these modifications fall within the technical concept of the present invention. [Explanation of symbols]

[0132] 1... Utility pole, 2... Suspension wire, 3... Trolley wire, 6... Branch wire, 7... Temporary guy wire, 8... Extension rope, 9... Weight, 10... Feeder wire (old feeder wire), 10'... Feeder wire (new feeder wire), 11... Puller, 16... Winding vehicle, 17... Winding drum, 18... Sending vehicle, 19... Sending drum, 20... Feeder wire branching device, 21... Branching fitting, 28... Pulling rope 100... Construction pulley 110...Suspension structure, 111...Rotating support shaft, 112, 112'...Transfer plate, 113, 113'...Suspension hole, 120, 120'...Frame, 127...Vertical roller holding structure, 130...Rotating body holding structure, 131...First shaft, 135, 135'...Rotating clamping plate, 140...(Smooth) Wheel (Rotating body), 1 41...Axis (parallel to the first axis), 150...(uneven surface) wheel (rotating body), 151...Axis (parallel to the first axis), 154...Base material, 155...Axis hole, 156...Mounting recess, 158...Convex member, 170...Intermediate roller, 171...(parallel to the first axis) axis, 180...Vertical roller, 182...Second axis, S...Obstacle 1000... Temporary branch fittings 1100...First wedge member, 1110...First main part, 1113...First wire diameter indicator part, 1115...First insertion depth indicator part, 1130...First wire holding part, 1132...First horizontal sliding contact surface, 1134...First inclined surface, 1137...First wire holding surface, 1138...First wire holding strip, 1140...First through hole, 1150...First widened part for striking, 1151...First connecting inclined surface, 1153...First insertion direction indicator part 1200...Second wedge member, 1210...Second main part, 1213...Second wire diameter indicator part, 1215...Second insertion depth indicator part, 1230...Second wire holding part, 1232...Second horizontal sliding contact surface, 1234...Second inclined surface, 1237...Second wire holding surface, 1238...Second wire holding strip, 1240...Second through hole, 1250...Second widened part for striking, 1251...Second connecting inclined surface, 1253...Second insertion direction indicator part 1300···Main body component, 1310···First retaining part, 1320···First main body clamping part, 1325···First reference position marking part, 1330···First wire clamping part, 1332···First horizontal folding surface on the main body side, 1334···First inclined surface on the main body side, 1337···First wire clamping surface, 1420···Second main body clamping part, 1425···Second reference position marking part, 1430···Second wire clamping part, 1432···Second horizontal folding surface on the main body side, 1434···Second inclined surface on the main body side, 1437···Second wire clamping surface

Claims

1. This is a method for replacing old power lines (hereinafter referred to as "old power lines") that are strung between multiple utility poles with new power lines (hereinafter referred to as "new power lines"), Before replacing the old power lines with new ones, A method for replacing utility poles, characterized by including the step of attaching a construction pulley equipped with a pair of revolving clamping plates and a wheel that rotates between the revolving clamping plates to a plurality of utility poles.

2. Before replacing the old power lines with new ones, The wire replacement method according to claim 1, characterized in that it includes the step of replacing the branch fitting of the wire branching device attached to the old wire with a temporary branch fitting.

3. In the process of replacing old power lines with new ones, The wire replacement method according to claim 1 or 2, characterized by including the step of connecting the old wire and the new wire and pulling out the old wire to replace the old wire with the new wire.

4. In the process of replacing old power lines with new ones, The wire replacement method according to claim 2, characterized in that it includes the step of removing the temporary branch fitting from the old wire.

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