JP2009044939A - Method of construction works for extending lead line, and dead end support for lead line used for the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of construction works for extending an lead line by and in which, when one of two existing electric poles equipped with a messenger wire therebetween is moved in the extending direction of the lead line to be rebuilt, a length of a part required to be formed newly of the lead line can be shortened and thereby reduction in material cost and construction cost becomes possible, and slacking of the added lead line is dissolved, and thereby the separation distance between the existing pole and the newly-built pole will not be an application-restricting factor, and to provide a dead end support for lead line. <P>SOLUTION: In the method of construction works for extending the lead line, the dead end support (10) for lead line is prepared on the extendedly formed messenger wire (25, 39), and the added line (42) is dead end supported via dead end clamps (44) and (45) for lead line which are engaged to the dead end support (10) for lead line and a dead end supporting part (371) for lead line of the newly-built electric pole (36), respectively; while the added line (42) is in a stretched state between the end clamps (44) and (45). A connection part (43) between the lead line (24) and the added line (42), and a connection part (372) of the added line (42) at the newly-built electric pole, are arranged on an edge line portion. The dead end support (10) includes a dead end clamp hang-fixing portion (50, 501) which can hang-fix the dead end clamp for lead line; and a hang-supporting portion (60), which swingably hangs and supports the dead end clamp hang-fixing portion. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for extending an overhead lead-in line when rebuilding one of two existing utility poles provided with inter-post messenger wires (hereinafter sometimes referred to simply as messenger wires), and a lead-in wire used in the construction. The present invention relates to a retaining support.

  In urban areas, when the distance between the overhead service line (hereinafter referred to as service line) and the power consumer is long and the service line cannot be directly drawn from the utility pole to the service customer's service entrance, An intermediate support system is used in which an inter-post messenger wire is stretched between power poles, and an aerial lead-in wire is suspended on the messenger wire. FIGS. 9A and 9B are diagrams for explaining a midway support system for an aerial lead-in wire using the inter-post messenger wire. FIG. 9A is a plan view, and FIG. 9B is an enlarged front view of the left half of the front view of FIG. Show. In this figure, reference numerals 14 and 16 are existing power poles, 25 is an inter-post messenger wire, 24, 30, and 31 are service wires, 27 is an insulating hanger, 26 and 26 are onions, and D1 to D3 are electric power consumers. In FIG. 6 (a), the existing utility poles 14 and 16 are not shown with equipment such as a pull-in armrest, but as shown in FIG. It shall be.

  The inter-post messenger wire 25 is provided with onions 26 and 26 at positions separated from the existing electric poles 14 and 16 that support the inter-post messenger wires 25 at both ends by two predetermined distances. Insulating portions of messenger wires 25 are formed between the utility poles 14 and 16, respectively. Between the two onions 26, 26 of the messenger wire 25, the electric power consumers D1-D3 are connected by insulating hangers 27, 27,... The service lines 24, 30, and 31 are suspended to the vicinity of the service entrances, and from there, they are installed toward the service entrances. As shown in FIG. 10, the insulating hanger 27 includes an arc-shaped insulating portion 27a covered with a vinyl chloride resin, a semi-spiral portion 27b extending from each end portion of the insulating portion 27a, and a key. It is comprised from the shape part 27c.

  Further, near the existing power pole 16, as shown in FIG. 9B, the lead-in wire retainer 23 is attached to the cap-shaped brackets (lead-in wire retaining support portions) 171 provided at both ends of the arm metal 17 of the existing power pole 16. Is supported through detention. Normally, as the lead-in wire retainer 23, a known bindless detainer 33 as illustrated in FIG. 11 is used. In this bindless tension insulator, two winding portions 33a, 33b; 33c, 33d are projected from the parallel parallel surfaces of a porcelain or synthetic resin rectangular main body 33, and orthogonal to these surfaces. The planes parallel to each other have a structure with a through hole 34 that passes through the perpendicular planes, and the lead wire 24 is appropriately wound around the winding portions 33a and 33b, so that the lead wire 24 is attached to the middle of the lead wire 24. It is supposed to be. The through hole 34 is inserted with one end of a retaining metal used to lock the bindless retaining insulator in a retaining metal retaining hole provided in the lead wire retaining support 171.

  One of the two existing power poles (for example, the power pole 16 in FIG. 6) expands the span length between the two existing power poles depending on the situation of the power consumer, etc., and extends the messenger wire 25 and the overhead lead-in wire 24. May be rebuilt in the direction. In this case, in order to add a new electric wire (hereinafter referred to as “lead-in wire addition line” or simply “add-in line”) to the lead-in wire 24, it is suspended by the insulating hangers 27, 27,. If the connection portion between the two portions is provided in the portion (see FIG. 9B, reference sign L), the dielectric strength at the connection portion is reduced, and the messenger wire may be charged to cause a short-circuit accident. , 27,... Cannot be provided with a connecting portion between the lead-in wire 24 and the lead-in wire additional line.

  Therefore, conventionally, as shown in FIG. 12, a lead-in wire addition line 42 is prepared, and this is suspended along insulating hangers 27, 27,... Attached to the messenger wire 25 along the existing lead-in wire 24. In the middle of the service line 24 being separated from the suspended portion L of the messenger wire 25 and being connected to the service port of the power consumer D1, the service line 24 is cut, and the cut end of the service wire 24 leading to the service port One end of the lead-in wire addition line 47 is connected to (connection point 43), and the other end is connected to a predetermined relay point of the new power pole 36 built in the rebuilding position, between the existing power pole 16 and the new power pole 36. A method of suspending the additional wire 42 on the messenger wire 39 using the insulating hanger 27 as appropriate has been adopted. However, this method has a problem that the redrawing length of the lead-in line becomes long and the time required for the re-drawing work becomes long. As a result, the material cost and the construction cost become high, and the cut-out portion of the lead-in line is wasted.

In order to solve this problem, the wire extension work for connecting the lead-in wire 24 and the additional wire 42 between the portion L suspended on the insulating hangers 27, 27,... A method is conceivable (see FIG. 13. In this figure, the same reference numerals are used for the same or common parts in FIGS. 9 to 12). This construction method is generally performed according to the following procedure.
(1) At the edge portion of the lead-in wire 24 between the lead-in wire retainer 23 supported by the lead-in wire retaining support portion of the lead-in arm 17 of the existing utility pole 16 and the lead-in terminal box 172 of the lead-in arm 17 Disconnect and connect one end of the lead-in line 42 to the end of the lead-in line 24 that leads to the lead-in port of the power consumer D1 (connection point 43).
(2) The other end of the lead-in wire addition line 42 is a predetermined relay point of the new utility pole 36 built at a predetermined rebuilding position (in FIG. 9, the terminal in the lead-in terminal box 372 of the lead-in arm 37) And a lead wire retainer 45 is attached to the lead wire addition line 42 near the other end, and is supported by the lead wire retaining support portion 371 of the lead-in arm 37 through this.

However, according to this construction method, it is necessary to prevent the connection point 43 between the additional line 42 and the lead-in line 24 from being subjected to tension, and therefore, the additional line 42 is provided between the newly installed utility pole 36 and the insulating hanger 27 closest to it. In the stretched state, it cannot be supported by the lead-in wire retaining support portion 371, and as described above, an insulating hanger is attached to the messenger wires 25 and 39 between the connection point 43 and the newly installed power pole 36, and the additional wire 42 is connected to the messenger wire. 25 and 39 cannot be suspended, so a relay point (such as a terminal portion in the lead-in terminal box) 372 provided on the lead-in arm 37 of the newly installed power pole 36 and the insulation hanger 27 closest to the relay point 372 Therefore, it is necessary to make the additional line 42 slack. If the distance between the position of the existing utility pole 16 and the position of the new utility pole 36 is increased, the slack of the additional line 42 will increase. For example, if there is a traffic path below it, traffic will be hindered. There was a possibility, and it was very problematic. Further, when the slack portion of the additional wire 42 is swung by wind or the like, the lead-in wire retainer 45 is also swung, and the additional wire 42 is disconnected at the relay point 372 of the newly installed power pole 36 or the connection point 43. In addition, there is a possibility that the lead-in wire 24 and the additional wire 42 are disconnected in FIG. 2, and the connecting point 43 contacts the messenger wires 25 and 39, and the covering material covering the connecting portion 43 is worn away, and charging to the messenger wire occurs. There was a possibility.
JP-A-11-178178

  In view of the above circumstances, the present invention can shorten the redrawing length of the lead-in wire when one of the two existing power poles provided with inter-post messenger wires is moved in the extension direction of the lead-in wire, thereby reducing the material cost and the construction cost. It is possible to reduce the slack of the lead-in wire addition line, to provide a method for extending the lead-in wire that is not limited by the separation distance between the existing power pole and the new power pole, and to provide a lead-in wire retaining support used in the method. Objective.

  In order to achieve the above object, the lead-in wire extension work method of the present invention enlarges one of the two existing power poles with a messenger wire stretched between them and suspends the messenger wire from the span. When rebuilding in the direction of extending the drawn lead-in line to the power source side, the messenger wire is extended and stretched between the newly installed utility pole at the rebuilding position and the other of the existing utility poles, and After cutting the lead-in line at the edge line part adjacent to the one existing power pole, one end of the lead-in line added separately is connected to the end part after cutting the lead-in line, and extended above the cutting position of the lead-in line In the state where the lead-in wire retainer is provided on the messenger wire located at the front and the lead-in wire adder is stretched between the lead-in wire retainer hooked on the lead-in wire retainer supported by the newly installed utility pole. After lifting, characterized by connecting the other end of the lead line added line to a predetermined power supply path.

  It is preferable that the lead-in wire retainer includes a retainer-holding portion capable of hooking the lead-in wire retainer, and a fishing support portion connected to the messenger wire so as to be swingably connected.

  According to the method for extending a service line according to the present invention, the existing service line is cut at the edge line portion adjacent to the existing service pole to be removed in the power pole rebuilding work, and the additional line is connected to this. The wire is supported between the lead-in wire retainer provided at a predetermined position of the extended messenger wire and the lead-in wire retainer hooked to the lead-in wire retainer in the newly installed utility pole in a state where the lead-in wire is added. Therefore, the redrawing length of the lead-in wire can be shortened to shorten the work time required for redrawing, thereby reducing the work time, material cost and construction cost, and there is no adverse effect caused by sagging the additional line. The transfer distance of the electric pole (distance between the rebuilding position and the position of the existing electric pole to be removed) can be increased.

  Hereinafter, with reference to FIG. 1 attached, the method for extending the service line of the present invention will be described in detail, taking as an example the case of rebuilding the existing utility pole 16 shown in FIG. 6 to a predetermined rebuilding position. In FIG. 1, (a) shows the state where the messenger wire is extended and stretched between the newly installed utility pole and the other existing utility pole, and (b) shows the situation of the extension work of the lead-in line to be performed thereafter. Yes. In FIG. 1, only one lead wire suspended by an insulating hanger 27 attached to the messenger wire 25 is illustrated, but even when a plurality of lead wires are suspended by an insulating hanger, It goes without saying that the method for extending a service wire of the present invention can be suitably applied. In FIG. 1, the same reference numerals are used for the same or common parts as those in FIGS. 9 to 12 illustrating the related art, and redundant description will be omitted below.

  As shown in FIG. 1 (a), the span length of the two existing power poles 14 and 16 is increased along the direction of the overhead line of the low-voltage overhead distribution line (main line), based on the previously designed telephone pole design. The new utility pole 36 is built according to a normal method at a predetermined rebuilding position in the direction in which the service line 24 is extended. With regard to service lines that need to be extended by rebuilding utility poles, there is a need for power outages when connecting additional lines 42 (to be described later). Each equipment required for the extension of the messenger wire 25 and the extension of the existing service line 24 is usually attached to the newly installed power pole 36 in accordance with the state of the overhead distribution lines and service lines at the local rebuilding position. Keep it.

  In FIG. 1, as a device required for the extension work of the lead-in wire 24, a lead-in arm 37 is attached to the new utility pole 36. The lead-in arm 37 has lead-in wire drawing support portions 371 and 371 at both ends in the length direction, and a lead-in terminal box 372 at an intermediate portion. This lead-in wire retaining support portion 371 is a semicircular plane provided with at least one retaining hole for retaining a retaining metal fitting (see FIG. 1B, reference numeral 45) fixed to one end of the lead-in wire retainer. It is a plate-shaped metal fitting (shade-shaped metal fitting) having a shape (in the example shown in the figure, this plate-like body is provided with four retaining holes). In FIG. 1, the lead-in wire retaining support portions 371 are provided at both ends in the length direction of the lead-in dedicated arm bracket 37, but the present invention is not limited to this, and depending on the situation, it is provided at either one end. Also good. In addition, the lead-in wire retaining support portion 371 is not limited to the cap-shaped bracket, and a known bracket having the same function can be used.

  In this way, by attaching the lead-in arm bracket 37 having the lead-in wire retaining support portion 371 and allowing the direction of the lead-in arm bracket 37 to be changed around the newly installed power pole 36, the one existing power pole 16 is removed. Even before, it can be supported in a state where the lead-in wire addition line 42 is stretched at an acute angle with respect to the direction in which the messenger wires 25 and 39 are stretched, so that the presence of the one existing power pole 16 does not hinder the lead-in wire. There is an advantage that the wire drawing work can be performed.

  The lead-in terminal box 372 includes a terminal fitting (not shown) inside, and a pull-down line branched from the overhead distribution line and the lead-in line are connected via this. To this terminal fitting, a lower end portion of a low-voltage underline 41 having a predetermined length fixed along the length direction is connected to the outer peripheral surface of the new utility pole 36. The upper end portion of the low-voltage underline 41 is prepared so that it can be connected to an unillustrated overhead distribution line (see reference numeral 20 in FIG. 9B). If it is not necessary to attach the lead-in arm 37 to the new utility pole 36 depending on the local situation, especially the number of lead wires and the direction of extension, the underline 41 is fixed to the outer peripheral surface of the new utility pole 36. It is also possible to hang down the lower end so that the lead-in line adding line 42 can be directly connected thereto.

  In addition, as a device required for extending the existing messenger wire 25, FIG. 1 shows a branch band 38 attached to a predetermined height position of the newly installed utility pole 36. This branch band 38 fixes one end of the messenger wire extension line 39.

  After the construction of the new utility pole 40, as shown in FIG. 1 (a), the messenger wire 25 is removed from the branch band 18 of the existing utility pole 16, and one end of the messenger wire extension line 39 is connected to the end of the messenger wire. The extended messenger wire is stretched between the new power pole 36 and the existing power pole 14 by extending and fixing the other end to a branch band 38 attached to the new power pole 36. It is preferable that a ball insulator 26 is provided at a position away from the newly installed utility pole 36 of the messenger wire extension line 39 and an insulating portion is formed between it and the branch band 38. A method for connecting the messenger wire 25 and the messenger wire extension line 39 is not particularly limited, and a conventionally known method can be used. In FIG. 1, these two wires are connected using a linear binding 40. The connecting portion 40 using the linear binding 40 is subjected to a tape winding process or the like as necessary. Further, the method of tensioning the extended messenger wires 25 and 39 can be performed by a normal method. If possible, the messenger wire extension line 39 is cut in advance by a predetermined length, one end of the messenger wire extension 39 is fixed to the branch band 38, and the other end is removed from the existing utility pole 16 after the messenger wire 25 is removed. A messenger wire extended between the two utility poles 14 and 36 may be stretched by connecting to the end.

  Then, as shown in FIG.1 (b), the upper region of the edge line part of the existing lead wire 24 (between the lead-in terminal box 172 and the lead-in wire retainer 23 provided in the lead-in arm 17 of the existing utility pole 16) The lead-in wire retaining support 10 is attached to an arbitrary position of the messenger wire 25 in FIG. The lead-in wire retaining support 10 includes a retainer latching portion 50 and a fishing support portion 60.

  The lead-in wire retaining locking part 50 is provided with at least one locking hole capable of locking the retaining metal fitting provided in the lead-in wire retaining tool (see reference numeral 44 in FIG. 1) at one end, and fishing at the opposite end. It is a plate-like body that can be connected to the support 60 or a combination thereof. Here, the combination refers to a structure having a structure in which the plate-like bodies are of the same type or a plate-like body deformed by bending the plate-like body is connected in series or in parallel. ing. In the following, in order to avoid confusion between this combination and the individual anchoring portions 50 constituting the combination, the combination is denoted by reference numeral 501 and will be described using this reference numeral.

  The fishing support 60 is not particularly limited as long as the fishing support 60 can be attached to the extended messenger wires 25 and 39 and can suspend and support the retainer latch 50, but preferably the retainer When an external force is applied to this via the stop portion 50, it is preferable to have a flexibility that changes the direction of the external force in the direction of the external force. As such a fishing support portion 60, various binding wires such as a wound binding having a strength characteristic capable of withstanding the weight of the retainer locking portion 50 and the external force are used alone, or the various binding wires and this are used. A connecting body with a gripping part capable of gripping a separate messenger wire can be used.

  Hereinafter, although the specific example of this lead-in wire retaining support 10 is demonstrated with reference to FIGS. 2-8, a lead-in wire retaining support is not limited to what was shown by these each figure. In the specific examples shown in these figures, a winding binding is used as the fishing support 60. The winding bind 60 is usually used to fix an electric wire to a pin insulator, and spiral portions are provided at both ends of the linear portion, and the linear portion is curved in a substantially U shape. The surface of the core wire is covered with an insulator. Hereinafter, the linear portion covered with the insulator is referred to as “straight portion 61”, and the spiral portion covered with the insulator is referred to as “spiral portion 62”. 2 to 8, the same or common parts are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 2 shows an example of the lead-in wire retaining support 10, wherein (a) is a front view and (b) is a side view. In the example shown in this figure, the lead-in wire retaining portion 50 has a substantially semicircular plane shape having an arc-shaped end edge and a linear end edge, and the plane has an arc-shaped end edge. Four oval locking holes 52, 52,... Penetrating through the front and back concentrically along the front and back of the plate-like body 51 are formed at equal intervals so that the major axis direction is directed in the radial direction. Become. On the back surface of the plate-like body 51, a connecting portion 56 having an insertion hole 57 through which the fishing support portion 60 is inserted substantially perpendicular to the surface and at a right angle to the edge is fixed. Yes. The opening area of the insertion hole 57 is set to be larger than the cross-sectional area in the direction perpendicular to the axial direction of the fishing support 60 inserted through the insertion hole 57, and the fishing support 60 is passed through the insertion hole 57 to lock the retainer. In a state in which the portion 50 is suspended, the retractor locking portion 50 swings freely around the contact portion with the outer peripheral surface of the fishing support portion 60 on the inner peripheral surface of the insertion hole 57. The method for fixing the connecting portion 56 to the plate-like body 51 is not particularly limited, and can be performed by known welding, adhesion, or the like, and these may be integrally formed.

  Moreover, FIG. 3 has shown another example of the lead-in line retaining support 10, (a) is a front view, (b) is a side view. In the example shown in this drawing, a structure is provided in which a connecting portion 56 is extended so as to be flush with the linear end edge of the plate-like body 51 shown in FIG. Similar to the example shown in FIG. 2, the connecting portion 56 is provided with an insertion hole 57 having an opening area larger than the cross-sectional area of the fishing support 60. Further, fastener through holes 54 are formed at positions symmetrical about the horizontal center line as viewed in the drawing of the plate-like body portion 51.

  The specific example shown in FIG. 4 is a modification of the example shown in FIG. 3, and is a boundary between the substantially semicircular plate-like body 51 shown in FIG. 3 and the connecting portion 56 extending at the linear edge. Is provided with a bent portion and formed in a cross-sectional shape. (Hereinafter, for convenience of explanation, the bent substantially semicircular plate-like body portion is denoted by reference numeral 55.)

  The specific example shown in FIG. 5 is comprised from the combination body 501 which combined the retainer locking part 50 shown in FIG. 3, and it shown in FIG. That is, the combination 501 of the retainer locking part shown in this figure is connected to the front and back surfaces of the connection part 53 in the retainer locking part 50 shown in FIG. 53 are in contact with each other, and the latter folded plate-like body portions 55, 55 are arranged at an acute angle toward the left direction of the figure with respect to the front and back surfaces of the former plate-like body portion 51. A bolt 70 is passed through an insertion hole 54 penetrating the three connecting portions 53, 53, 53, and a nut 71 is screwed into the bolt 70 to tighten them. By combining in this way, a gap can be provided between the folded plate-like body portions 55, 55 and the plate-like body portion 51, so that the plate-like body portions 55, 55, 51 are drilled. It is possible to lock the retaining metal fittings of the lead-in wire retaining tool in the respective retaining metal fitting holes 52, 52,. For example, when a plurality of lead-in wires are suspended in the insulating hanger 27, the combination device 501 of the holding-tool locking portions having such a structure is used to draw each lead-in wire to the lead wire via the lead-in wire drawing tool. It can be used effectively when supporting.

  Moreover, FIG. 6 has shown the further another example of the lead-in line retention support part 10 of this invention, (a) is a front view and (b) is a side view similarly to FIG. 2 and FIG. The lead-in wire retaining section 50 shown in this figure includes projecting pieces 53 that project laterally from the straight edge of the plate-like body 51 shown in FIG. 2 toward this figure. Each has two through holes 51a, 51a; 53a, 53a. In addition, a through hole 53b penetrating the front and back surfaces is formed in the approximate center of the base portion of the protruding piece 53. In addition, in the vicinity of the through holes 53a and 53a on the back surface of the protruding piece 53, a connecting portion 56 having an insertion hole 57 is fixed substantially perpendicular to the surface. In addition, in FIG. 6, although this connection part 56 is shown by the shape similar to that shown in FIG. 2, it is not limited to such a shape.

  In the lead-in wire retaining support 10 shown in FIGS. 7 and 8, the retainer locking portion 50 is composed of a combination of two each of the tensioning device locking portions 50 shown in FIG. 6. In a specific example of the retainer locking portion 50 shown in FIG. 7, the two retainer locking portions 50, 50 are substantially parallel to each other with a predetermined distance between the faces facing each other so that the connecting portion 56 is on the outside. It has a structure that faces. Cylindrical spacers 72, 72, and 75 are interposed between the opposing surfaces to separate the two retainer locking portions 50 and 50 by a predetermined distance. These spacers 72, 72, and 75 are loosely mounted on long bolts 70, 70, and 73 that pass through the through holes 53 a, 53 a, and 53 b, respectively, and are fixed by tightening with nuts 71, 71, and 74. It has become. In this way, by arranging the two retainer locking portions 50 apart from each other by a predetermined distance in parallel, the retaining metal locking holes 52, 52,. It can be used effectively, and the lead-in wire retainer attached to each of the multiple lead-in wires can be locked in any of the metal fitting locking holes 52, 52,. Moreover, in this specific example, by increasing the number of the retainer locking portions 50 arranged in parallel in correspondence with the number of service lines that are wired in the field, it is possible to retain these service lines. . In addition, in FIG. 7, the long volt | bolt 70, the nut 71, and the spacer 72 which are penetrated to the through-hole 53a of the back | inner side toward this figure are not shown in figure.

  The specific example shown in FIG. 8 has shown the combination 501 provided with the structure which connected the two retaining locking parts 50 shown in FIG. 6 in series. These two retention locking portions 50, 50 are through holes 51 a, 51 a drilled on the substantially semicircular edge side of the plate-like body portion 51 of one of the retention locking portions 50 connecting the fishing support 60. The through holes 53a and 53a drilled at one end of the projecting piece of the other retractor locking portion 50 are combined with each other by passing bolts 70 and 70 and tightening and fixing with nuts 71 and 71. Yes. Also in the combination 501 of the retaining latching portions, the retainer latching portions 50 can be further connected in series in consideration of the number of lead wires installed on the site.

  After the above-described exemplary lead-in wire retaining support 10 is attached to the messenger wire 25, the lead-in wire 24 is cut at the edge portion of the existing lead-in wire 24, and the lead-in wire 24 on the side suspended on the insulating hanger 27 is cut off. A separately prepared additional wire 42 is electrically connected to the end, and the connection point 43 is subjected to waterproofing or the like by a known method. The additional line 42 to be used may be cut to a length necessary for the underline from the connection point 43 to the newly installed utility pole 16, for example, carried to the site while being wound around a wire drum, and extended to the extension line of the present invention. It may be used by pulling it out from the drum by the length required for wire construction, and finally cutting off the unused part.

  The lead-in wire retainer 44 is attached to the additional wire 42 near the connection point 43, and the retainer provided in the lead-in wire retainer 44 attached in this way is locked in the metal-holding hole 52 of the lead-in wire retainer 10 attached to the messenger wire 25. If the lead wire retaining support 10 is provided with a plurality of metal fitting locking holes 52, 52,..., The retaining metal fittings are engaged with the locking holes 52 oriented in the same direction as the overhead wire direction of the additional wire 42. It is preferable to stop. As the lead-in wire retainer 44, it can be attached in the middle of the additional wire 42, and as will be described later, the structure is not limited as long as it can be hooked on the lead-in wire retainer support portion. A known bindless retaining insulator as illustrated is used. Since the structure of the bindless retaining insulator shown in this figure is as described above, it is omitted here. The installation position of the lead-in wire retainer 44 to the additional wire 42 is such that when the lead-in metal fitting is locked to the lead-in wire retaining support 10 and the additional wire 42 is retained in the lead-in wire retaining support 10, the insulation closest to the existing utility pole 16 is provided. It is preferable that the lead wire 24 and the additional wire 42 connected at the connection point 43 be in a slack state between the hanger 27 and the lead wire retaining support 10 so that the extended portion is formed.

  In this way, the add-on wire 42 supported near the connection point 43 on the lead-in wire holding support 10 provided on the messenger wire 25 is provided with a cap-shaped bracket (lead-in wire holding support portion) 371 provided at both ends of the lead-in arm 37 for the new power pole 36. It will be extended to the vicinity of one of them. At that position, the lead-in wire retainer 45 is attached to the additional wire 42, and the retaining metal fitting is locked in a predetermined metal fitting locking hole of the cap-shaped metal fitting. At this time, the lead-in wire retainer 45 is attached to the lead-in wire retainer 44 locked to the lead-in wire retainer 10 provided on the messenger wire 25 so that the additional wire 42 is stretched. The retaining metal fitting of the lead-in wire retainer 45 is locked to the cap-shaped metal fitting 371 of the lead-in dedicated arm bracket 37. As this lead-in wire retainer 45, the thing provided with the structure similar to the above-mentioned lead-in wire retainer 44 can be used.

  Thereafter, the end of the additional wire 42 opposite to the connection point 43 is electrically connected to a predetermined terminal fitting in the lead-in terminal box 372 provided in the lead-in arm bracket 37. At this time, in the case of using the additional line 42 cut in advance to a predetermined length, the slack of the additional line 42 between the lead-in wire retainer 45 and the lead-in terminal box 372 is confirmed, and if necessary, the predetermined slack is obtained. What is necessary is just to cut off the edge part of the addition line 42 so that it may become, and to peel off the coating | cover of the edge part of the addition line 42, and to connect. Further, when the additional wire 42 is pulled out from the electric wire drum and used, the additional wire 42 has a predetermined length so that a predetermined slack is provided between the lead-in wire retainer 45 and the lead-in terminal box 372. Is cut off, and then the covering of the end portion is peeled off for connection.

  Since one end of the low-voltage underline 41 is connected in advance to the terminal fitting in the pull-in terminal box 372, the other end of the low-voltage underline 41 is connected to a predetermined power supply path according to a normal method. The work for extending the lead-in wire of the invention is completed.

  As described above, according to the method for extending a lead-in wire according to the present invention, the lead-in wire is cut at the edge line portion close to the existing utility pole before the relocation, so that the re-drawing length of the lead-in wire can be made shorter than the conventional method. As a result, the working time required for the lead-in line overhead can be shortened, the material cost and the construction cost can be reduced, and the lead-in wire retaining support is provided on the messenger wire. Since the anchoring support is performed in a state where the additional line is stretched between the two (the two supporting points) via the locked retractor, the adverse effect due to the slack of the additional line does not occur in the first place. In addition, since tension is applied only to the additional line 42 between the two service line retainers 44 and 45, the edge ship portion is attached to the additional line 42 (service line 24) outside the service line retainers 44 and 45. Each can be formed, and the connection point 43 and the connection part of the additional line 42 in the lead-in terminal box 372 can be arranged at each edge line part.

It is explanatory drawing which shows an example of the wire drawing construction method of the lead-in wire of this invention. It is a figure which shows an example of embodiment of the lead-in line retention support tool of this invention. It is a figure which shows another example of embodiment of the lead wire retention support tool of this invention. It is a figure which shows the modification of embodiment shown in FIG. It is a figure which shows another modification of embodiment shown in FIG. It is a figure which shows another example of embodiment of the lead wire support tool of this invention. It is a figure which shows the modification of embodiment shown in FIG. It is a figure which shows another modification of embodiment shown in FIG. It is a figure explaining an example of the midway support system of an aerial service line. It is a figure which shows an example of a general insulation hanger. It is a figure which shows the usage example of a general lead-in wire retainer. It is explanatory drawing which shows an example of the conventional wire drawing construction method of the lead-in wire in the case of transferring one electric pole where the inter-post messenger wire was stretched. It is a figure which shows another example of the extending | stretching construction method of the lead-in wire which can be considered when transferring one utility pole over which the inter-pillar messenger wire was stretched.

Explanation of symbols

10 Lead-in wire retaining support 14, 16 Existing power poles 15, 18 Branch band 17 Pull-in arm 171 Lead-in wire retaining support 20 Overhead distribution line 21 Low-voltage underline 22 Underline 23, 29 Lead-in wire retainer (bindless detainer)
24, 30, 31 Lead-in wire 25 Existing pillar messenger wire 26 Ball insulator 27 Insulation hanger 28 Intermediate support bracket 36 New power pole 37 Lead-in arm 371 Lead-in wire retaining support 372 Lead-in terminal box 38 Branch band 39 Messenger wire extension wire 40 Messenger wire Connection (straight binding)
41 Low-voltage underline 42 Lead-in wire additional line 43 Connection points 44, 45 Lead-in wire retainer 50 Lead-in wire retainer latching portion 501 Lead-in wire retainer locking portion (combined body)
51 Plate-like body 51a, 51a Through hole 52 Retention tool latching hole 53 Connecting part 54a, 54b Through hole 56 Connecting part 57 Fishing support part insertion hole 60 Binding with winding (fishing support part)
61 Linear part 62 Spiral part

Claims (3)

When reconstructing one of the two existing power poles on which the messenger wire is stretched in the direction in which the span is expanded and the lead-in wire suspended on the messenger wire is extended to the power source side,
The messenger wire is extended and stretched between the new utility pole installed at the rebuilding position and the other of the existing utility poles, and the lead-in wire is cut at the edge line portion adjacent to the one existing utility pole. Then, connect one end of the separately provided lead wire to the end after cutting the lead wire,
The messenger wire positioned above the cutting position of the service line is provided with a service line retention support, and the service line additional support line is stretched between the service line retention tool and the service line retention support provided on the newly installed utility pole. After extending in the state, the other end of the lead-in line is connected to a predetermined power supply path, and the lead-in wire extension work method is characterized in that   The lead-in wire retainer provided on the messenger wire includes a lead-in wire retainer hook that can hook the lead-in wire retainer, and a fishing hook that is attached to the messenger wire and suspends and supports the lead-in wire retainer. The method for extending a service wire according to claim 1, further comprising a branch.   It is a lead-in wire support tool used in the method for extending a lead-in wire according to claim 1 or 2, and is attached to a messenger wire, and a lead-in wire retainer that is attached to a messenger wire. A lead-in wire support, comprising a fishing support section that suspends and supports the section in a swingable manner.

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