JP2021136736A - Protective cover and removal method of upper overhead line at intersection of overhead lines - Google Patents

Abstract

To provide a protective cover that can be easily attached to and detached from an overhead line even in working from the ground, and can efficiently remove the overhead line, and a removal method of an upper overhead line at the intersection of the overhead lines using the protective cover.SOLUTION: A protective cover 1 includes a plate-shaped cover body 2 with an inverted C-shaped cross section that is formed in a long shape and opens downward, and a hook 3 attached to the lower surface of the central part of the cover body 2 in the longitudinal direction, and the cover body 2 includes a pair of protrusions 4 that protrude upward at the upper ends of the cover body 2 in the longitudinal direction, and the hook 3 includes a hook-shaped hook body 7 having a locking side opening 9 in the lateral direction of the cover body 2, and a hook portion 11 provided outside the hook body 7 in the opposite direction of the locking side opening 9.SELECTED DRAWING: Figure 3

Description

The present invention provides a protective cover used to temporarily cover the lower overhead line when the upper overhead line is removed at an intersection of overhead lines including an overhead distribution line, and a protective cover thereof. It relates to a method of removing an upper overhead line at an intersection of overhead lines using.

In modern times, where many overhead lines including overhead distribution lines are stretched, there are innumerable intersections of overhead lines. Overhead lines need to be removed / replaced due to deterioration, etc., but during removal / replacement work at intersections, the overhead lines to be removed should not damage other overhead lines that intersect underneath. Need to work on. At present, as shown in Fig. 1, a worker heads to the intersection of overhead lines using an aerial work platform, and the worker manually pulls the overhead line to be removed so that the overhead lines do not come into contact with each other. While sending, the removal work is being carried out with multiple assistant workers and supervisors. Therefore, the current removal work of overhead lines requires a lot of time and cost due to the use and mobilization of aerial work platforms. Here, the purpose of using the aerial work platform is to send workers to the intersection to avoid contact between the overhead line to be removed and the overhead line on the lower side. Therefore, if the overhead line to be removed and the overhead line on the lower side can be separated without human intervention, the number of personnel involved in aerial work can be reduced. Therefore, by temporarily attaching a cover for preventing damage (for example, Patent Documents 1-3) to the lower overhead line, the overhead line to be removed and the lower overhead line can be removed without human intervention. It is thought that isolation from and can be achieved.

Japanese Unexamined Patent Publication No. 2018-85816 Japanese Unexamined Patent Publication No. 2018-73580 JP-A-2018-68057

However, the damage prevention cover as described above has a structure that does not easily come off for the purpose of long-term wearing, and it is necessary to manually attach the cover to the overhead line. In other words, as in the past, workers must be sent to the intersection, and the use of aerial work platforms cannot be avoided.

Therefore, an object of the present invention is a protective cover that can be easily attached to and detached from the overhead line even when working from the ground, and that can efficiently remove the overhead line, and an overhead line using the protective cover. To provide a method of removing the upper overhead line at the intersection of.

In order to achieve the above object, the invention according to claim 1 is a protective cover used to temporarily cover the lower overhead line when the upper overhead line is removed at the intersection of the overhead lines. A plate-shaped cover body formed in a long shape and a hook attached to the lower surface of the cover body are provided, and the cover body projects upward at both upper ends in the longitudinal direction of the cover body. The hook has a pair of protruding portions, and the hook has a hook-shaped hook body having a locking side opening in the lateral direction of the cover body, and a hook portion provided outside the hook body in the opposite direction of the locking side opening. It is characterized by having and.
The invention according to claim 2 is characterized in that, in the configuration of claim 1, the hook is provided at the lower end of the hook body and includes a plate-shaped guide portion that opens in a direction facing the locking side opening. And.
According to a third aspect of the present invention, in the configuration of the first or second aspect, the hook has a closing position in which the lower end is rotatably connected to the lower part of the hook body and the locking side opening is closed from the inside of the hook body. A retaining member that can move between the opening position that retracts inward and opens the locking side opening is provided, and its end is rotatably connected to the tip of the locking member to open the locking side opening. An interlocking portion extending in the opposite direction is provided, and a hooking portion is provided at the tip of the interlocking portion.
The invention according to claim 4 is characterized in that, in any of the configurations of claims 1 to 3, a roller that is rotatable about the vertical direction as a rotation axis is provided on the protruding portion.
In the invention according to claim 5, in any of the configurations of claims 1 to 4, a stopper having a shape that opens downward and gradually narrows toward the upper portion is provided on the lower surface side of the cover body. It is characterized by that.
The invention according to claim 6 is a method of removing an upper overhead line at an intersection of overhead lines, wherein a predetermined length is provided on a hook portion of a protective cover having a configuration according to any one of claims 1 to 5. Hook the tip of the operating rod to lift the protective cover, and let the lower overhead line at the intersection relatively enter from the locking side opening of the hook body to lock the hook body to the lower overhead line. After covering the lower overhead line from above with the cover body, remove the operation rod from the hook, lower one end of the upper overhead line, and put the upper overhead line on the upper surface of the cover body between the protruding parts. The upper overhead line is removed by lowering the other end of the upper overhead line, and then the protective cover is removed from the lower overhead line using an operation rod. ..

According to the inventions of claims 1 and 6, the protective cover can be easily attached to and detached from the overhead line by working from the ground. Further, it is possible to prevent the overhead wire to be removed from falling off from the protective cover during the removal work of the overhead wire after the protective cover is attached. Further, it is possible to stabilize the mounting posture of the protective cover attached to the overhead line. Furthermore, it is possible to efficiently remove the overhead line with a small number of people without sending workers to the intersection of the overhead line.
According to the second aspect of the present invention, in addition to the above effects, it is possible to stabilize the operability when attaching the protective cover to the overhead wire from the ground using the operation rod. Further, by giving weight to the guide portion, the center of gravity of the protective cover can be lowered, and the mounting posture of the protective cover attached to the overhead line can be stabilized.
According to the third aspect of the present invention, in addition to the above effects, it is possible to prevent the protective cover attached to the overhead wire from falling off.
According to the fourth aspect of the present invention, in addition to the above effects, the overhead line can be smoothly drawn out, so that the work efficiency is improved.
According to the fifth aspect of the present invention, in addition to the above effects, the mounting posture of the protective cover can be stabilized.

It is explanatory drawing which shows the removal method of the overhead line at a conventional intersection. It is a front view of the protective cover in embodiment of this invention. It is a side view which shows the protection cover of the closed state in embodiment of this invention. It is a side view which shows the protective cover in an open state in embodiment of this invention. (A) and (B) are explanatory views which show the procedure of the method of removing the overhead line at the intersection of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 2 is a front view of the protective cover according to the embodiment of the present invention, and FIG. 3 is a side view showing the protective cover in a closed state.
As shown in FIGS. The hook 3 is provided.
A pair of projecting portions 4 and 4 projecting upward are provided on both upper ends of the cover body 2 in the longitudinal direction, and the projecting portions 4 and 4 are rotatable in the vertical direction with the vertical direction as the rotation axis. Rollers 4a and 4a are provided. Further, on the lower surfaces of both ends of the cover main body 2 in the longitudinal direction, inverted V-shaped stoppers 5 and 5 which are attached along the lateral direction of the cover main body 2 and open downward and are narrowed upward are provided. Insulating portions 6 and 6 provided and formed of an electrically insulating material are formed along the lower ends of the stoppers 5 and 5.

The hook 3 has a hook-shaped hook body 7 having a locking side opening 9 (FIG. 4) in the lateral direction of the cover body 2, and its lower end is rotatably connected to the lower part of the hook body 7 to be connected to the locking side. As shown in FIG. 4, it is possible to move between the closing position where the opening 9 is closed from the inside 7a of the hook body 7 and the opening position where the opening 9 is retracted to the inside 7a of the hook body 7 to open the locking side opening 9. It is provided with a retaining member 8. The retaining member 8 is urged toward the closed position by an urging means (not shown) such as a coil spring. Further, an interlocking portion 10 is provided at the tip of the retaining member 8 so that the end portion is rotatably connected and extends in the opposite direction of the locking side opening 9, and a ring-shaped hook portion is provided at the tip of the interlocking portion 10. 11 is provided. Further, at the lower end of the hook main body 7, a guide portion 12 having a U-shaped cross section that opens in a direction facing the locking side opening 9 is provided. The guide portion 12 is made of a high-density material and has a constant weight.

Next, the procedure of attaching the protective cover 1 to the overhead line will be described.
FIG. 4 is a side view showing a protective cover in an open state according to the embodiment of the present invention.
A worker on the ground attaches the protective cover 1 to an overhead line by using an operation rod 13 having a Jitte-shaped protrusion 13a at the tip. When the retaining member 8 hooks the protrusion 13a of the operating rod 13 on the hooking portion 11 of the hook 3 in the closed position and lifts the protective cover 1 upward, the hooking portion 11 is supported by the operating rod 13. The protective cover 1 moves relatively downward, and at that time, the retaining member 8 rotates in conjunction with the movement of the interlocking portion 10 to move to the open position, and the locking side opening 9 is opened. When the protective cover 1 is lifted further upward, the protective cover 1 tilts in the lateral direction of the cover main body 2 with the hooking portion 11 as a fulcrum. At this time, the protective cover is locked by locking the operation rod 13 to the guide portion 12. Since 1 is supported by the operating rod 13 and rotational movement in the vertical direction can be suppressed, the operability of the protective cover 1 can be stabilized.
The operating rod 13 is not limited to the above-described one, and any one may be used as long as it can be hooked on the hooking portion 11 and the protective cover 1 can be attached to the overhead wire.

The protective cover 1 in the above-mentioned state is lifted to a predetermined height and operated, and the overhead wire below the overhead wire to be removed is made to enter the inner side 7a of the hook main body 7 from the locking side opening 9 of the hook 3. After accommodating the lower overhead wire in the inner side 7a of the hook body 7, when the operation rod 13 is lowered and removed from the hook portion 11, the retaining member 8 urged by the urging means (not shown) moves to the closed position. Then, the locking side opening 9 is closed. At this time, as shown in FIG. 3, the overhead line Y housed in the inner side 7a of the hook body 7 is collected at the narrowest position of the stopper 5 and locked to the hook body 7, so that the cover body 2 is short. The displacement in the manual direction is suppressed, and the mounting posture of the protective cover 1 on the overhead line can be stabilized. Further, at this time, since the center of gravity of the protective cover 1 is lowered to the center and downward in the longitudinal direction of the cover main body 2 by the heavy guide portion 12, the mounting posture of the protective cover 1 can be stabilized.
The removal may be performed in the reverse procedure of the attachment. After hooking the protrusion 13a of the operation rod 13 on the hook portion 11 of the protective cover 1, lift it upward to lift the hook 3 retaining member 8 from the hook 3. The protective cover 1 can be lowered to the ground by moving it to the open position and discharging the lower overhead wire housed in the inner side 7a of the hook body 7 from the locking side opening 9 to the outside of the hook 3.
As described above, the work of attaching / detaching the protective cover 1 to the overhead line can be easily performed from the ground by using the operation rod 13.

Subsequently, the procedure for removing the overhead line at the intersection using the protective cover 1 will be described.
First, as shown in FIG. 5A, the ground worker a attaches the protective cover 1 to the overhead line Y below the overhead line X to be removed at the intersection by the procedure as described above. At this time, the protective cover 1 is arranged so that the overhead line X is located between the protrusions 4 and 4. Although the number of overhead lines Y is one on the drawing, there may be a plurality of overhead lines Y.
Next, as shown in FIG. 5 (B), the worker b who climbed the utility pole P to which one end of the overhead line X was attached removed one end of the overhead line X from the utility pole P and then used the rope 14. , Lowered to the ground, worker a receives one end of the overhead line X. After that, with the overhead lines X crossed on the upper surface of the protective cover main body, the other end of the overhead lines X remaining in the sky is pulled out from the ground and removed. At this time, by attaching the protective cover 1 to the overhead line Y, the removal work can be performed without damaging the overhead line Y without mobilizing workers at the intersections of the protective covers. Further, since the rollers 4a and 4a are provided on the protruding portions 4 and 4, the overhead line X does not fall off from the cover main body 2 during the work, and the overhead line X can be smoothly pulled out. Efficiency is improved. Further, unlike the conventional removal work, it is not necessary to mobilize a large number of workers and introduce an aerial work platform, and two workers a and b can perform the removal work of the overhead line X. Work time and cost can be reduced.
After the removal work of the overhead line X is completed, the protective cover 1 is removed from the overhead line Y according to the above procedure.

The protective cover 1 of the above-described form has a plate-shaped cover body 2 having an inverted C-shaped cross section that is formed in a long shape and opens downward, and a hook attached to the lower surface of the central portion of the cover body 2 in the longitudinal direction. The cover body 2 is provided with a pair of projecting portions 4 and 4 projecting upward at both upper ends of the cover body 2 in the longitudinal direction, and the hook 3 is engaged in the lateral direction of the cover body 2. A hook-shaped hook main body 7 having a stop-side opening 9 and a hook portion 11 provided outside the hook main body 7 in the opposite direction of the locking-side opening 9 are provided.
According to the protective cover 1 having such a form, the protective cover 1 can be easily attached to and detached from the overhead line Y by working from the ground. Further, it is possible to prevent the overhead line X from falling off from the protective cover 1 during the removal work of the overhead line X. Further, it is possible to stabilize the mounting posture of the protective cover 1 mounted on the overhead line Y. Furthermore, the removal work of the overhead line X can be efficiently performed by a small number of people without sending the worker to the intersection of the overhead lines X and Y.

Further, the hook 3 is provided at the lower end of the hook main body 7, and includes a guide portion 12 having a U-shaped cross section that opens in a direction facing the locking side opening 9.
Therefore, it is possible to stabilize the operability when attaching the protective cover 1 to the overhead line Y from the ground using the operation rod 13. Further, by giving the guide portion 12 a weight, the center of gravity of the protective cover 1 can be lowered, and the mounting posture of the protective cover 1 attached to the overhead line Y can be stabilized.

Further, the lower end of the hook 3 is rotatably connected to the lower part of the hook main body 7, and the locking side opening 9 is closed from the inner side 7a of the hook main body 7 and the locking side opening 9 is retracted to the inner side 7a. An interlocking member 8 is provided that can move between the opening position and the opening position of the opening 9, and the end of the retaining member 8 is rotatably connected to the tip of the retaining member 8 and extends in the opposite direction of the locking side opening 9. The portion 10 is provided, and the hook portion 11 is provided at the tip of the interlocking portion 10.
Therefore, it is possible to prevent the protective cover 1 attached to the overhead line Y from falling off.

Further, the protrusions 4 and 4 are provided with rollers 4a and 4a that are rotatable in the vertical direction with the vertical direction as the rotation axis.
Therefore, the overhead line X can be pulled out smoothly, and the work efficiency is improved.

Further, inverted V-shaped stoppers 5 and 5 which are opened downward and narrowed upward are provided on the lower surface side of both ends of the cover body 2 in the longitudinal direction.
Therefore, the mounting posture of the protective cover 1 can be stabilized.

The above is a description of the present invention based on the illustrated examples, and the technical scope thereof is not limited to this.
For example, the shape of the cover body can be changed as appropriate as long as it opens downward. The cross-sectional shape may be an inverted V-shape, an inverted U-shape, an inverted U-shape, or the like, or the upper surface of the protective cover may be inclined so that the vertical cross-sectional shape is V-shaped. good.
In addition, rollers extending in the longitudinal direction may be provided at both ends of the cover body so that the overhead wire can be pulled out more smoothly.
Further, the hook is not limited in its shape and specifications as long as it can accommodate the overhead line that is not to be removed at the intersection of the overhead lines. Further, a plurality of hooks may be provided, and the installation location thereof can be arbitrarily set.
Further, as long as the stoppers are provided at least on the lower surface side of both ends in the longitudinal direction of the cover body, a plurality of stoppers may be provided, and the arrangement thereof is not limited. In addition, the shape of the stopper can be designed in any shape as long as it can stabilize the mounting posture of the protective cover.
In addition, the arrangement and installation method of the insulating portion are not limited. For example, the surface of the stopper may be completely covered with an insulating portion, or the stopper may be formed of a material having electrical insulation and provided. Further, the stopper may be omitted and an insulating coating may be applied to the back surface of the cover body, or an insulating portion may be provided on the upper part of the hook body. On the other hand, depending on the type of overhead wire to be protected, a design may be made in which an insulating portion is not provided.
Further, the shape of the guide portion can be appropriately changed as long as the guide portion is opened in the direction opposite to the locking side opening. Further, the guide portion and the hook main body may be formed integrally or may be combined separately.
Further, the shape of the hook portion can be changed as appropriate as long as the protective cover can be lifted to a high place by using the operation rod and the protective cover does not fall off during the work of attaching / detaching the protective cover to the overhead line.

1 ... Protective cover, 2 ... Cover body, 3 ... Hook, 4 ... Roller, 5 ... Stopper, 6 ... Insulation part, 7 ... Hook body, 8 ... Retaining member, 9 ... Stop side opening, 10 ... interlocking part, 11 ... hooking part, 12 ... guide part.

Claims (6)

A protective cover used to temporarily cover the lower overhead line when the upper overhead line is removed at the intersection of the overhead lines.
It is provided with a plate-shaped cover body formed in a long shape and a hook attached to the lower surface of the cover body.
The cover body has a pair of projecting portions projecting upward at both upper ends of the cover body in the longitudinal direction.
The hook includes a hook-shaped hook body having a locking side opening in the lateral direction of the cover body, and a hook portion provided outside the hook body in the opposite direction of the locking side opening. A protective cover featuring. The protective cover according to claim 1, wherein the hook is provided at the lower end of the hook body and includes a plate-shaped guide portion that opens in a direction facing the locking side opening. The lower end of the hook is rotatably connected to the lower part of the hook body to close the locking side opening from the inside of the hook body, and retract to the inside to open the locking side opening. Equipped with a retaining member that can be moved to and from the open position
An interlocking portion is provided at the tip of the retaining member so that the end portion is rotatably connected and extends in the direction opposite to the locking side opening.
The protective cover according to claim 1 or 2, wherein the hooking portion is provided at the tip of the interlocking portion. The protective cover according to any one of claims 1 to 3, wherein a roller that can rotate around the vertical direction is provided on the protruding portion. The protective cover according to any one of claims 1 to 4, wherein a stopper having a shape that opens downward and gradually narrows toward the upper portion is provided on the lower surface side of the cover body. It is a method of removing the upper overhead line at the intersection of the overhead lines.
The protective cover is lifted by hooking the tip of an operation rod having a predetermined length on the hooking portion of the protective cover according to any one of claims 1 to 5, and the hook body is lowered from the locking side opening at the intersection. The hook main body is locked to the lower overhead wire by relatively entering the overhead wire on the side, and the lower overhead wire is covered from above by the cover main body, and then the operation is performed. Remove the rod from the hook and remove it.
With one end of the upper overhead line lowered and the upper overhead line crossed over the upper surface of the cover body between the protrusions, the other end of the upper overhead line is lowered to the upper side. Remove the overhead line,
After that, a method for removing the upper overhead line at the intersection of the overhead lines, which comprises removing the protective cover from the lower overhead line by using the operation rod.

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