JP2016203791A - Grounding rod for electric overhead wire construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate grounding rod lifting work in overhead wire construction by reducing an overall weight of grounding rods for electric overhead wire construction.SOLUTION: A grounding rod includes a grounding rod body 20, and a hook metal fitting 30 provided at the top end of the grounding rod body 20. The grounding rod body 20 is constituted by a plurality of hollow conductors 22 and conductor connection parts 24 for connecting the adjacent hollow conductors 22, and includes insulation coating layers 23 for coating part or the whole of conductor exposure parts of the grounding rod body 20 and a ground wire connection part 40 for connecting a ground wire 46 to the hollow conductors 22 near the lower part of the hollow conducts 22 of the grounding rod body 20. The conductor connection parts 24 consist of conductor coupling joints 24P for assembly and disassembly by a single-touch operation.SELECTED DRAWING: Figure 1

Description

The present invention is for overhead wire construction for electrically connecting an overhead wire to a rail or the like for grounding in order to perform work safely when constructing an overhead wire such as a trolley wire in a power failure state. It relates to the improvement of the grounding rod.

The grounding work grounding rod has a hook fitting at the upper end that is hooked to the overhead line to ground the overhead line to the rail, etc. when the overhead line is safely constructed in a power failure state, and is connected to this hook fitting and led out from the lower end. It consists of an insulating operation rod including a ground wire (see Patent Document 1).

  When constructing the overhead wire, after the power failure of the overhead wire, connect the grounding bracket to which the ground wire of the grounding rod is connected to the rail, etc., and then hook the hook fitting to the overhead wire with the operation insulating rod, and ground the overhead wire to the rail, etc. doing.

  The grounding rod 3 of the prior art (Patent Document 1) is composed of an insulating operation rod 8 (neo pipe) composed of a plurality of hollow bars connected to each other and a conductive rod 10 extending in the insulating operation rod 8. The hook metal fitting 12 is connected to the conductive rod 10 at the head of the insulating operation rod 8, and the ground wire 11 is connected to the conductive rod 10 near the lower end of the insulating operation rod 8 (see FIG. 3 of Patent Document 1). .

  In addition, another conventional grounding rod has a structure in which the ground conductor is not disposed inside the insulating operation rod (neopipe) but along the outer surface of the insulating operation rod, and the upper end thereof is connected to the head fitting. ing.

  However, these prior art grounding rods are made of solid conductors in which the conductors from the hook metal fittings or the head metal fittings to the ground wire extend inside and outside the insulating operation rods. The work of lifting the rod and hooking it on the overhead wire is extremely troublesome due to the large weight of the conductive rod, and there is a drawback that the workability is low.

JP 2006-69448 A

  The problem to be solved by the present invention is to provide a grounding work grounding rod capable of reducing the overall weight so that the grounding rod can be easily lifted.

The problem-solving means of the present invention is a grounding rod for overhead wire construction comprising a grounding rod body and a hook metal fitting provided at an upper end of the grounding rod body, wherein the grounding rod body includes a plurality of hollow conductors adjacent to a hollow conductor. And a ground wire connecting portion for connecting a ground wire to the hollow conductor in the vicinity of the lower portion of the hollow conductor of the ground rod main body. It is providing the earthing | grounding rod for overhead wire construction characterized by having.

  In the above problem solving means of the present invention, it is preferable that the hook metal fitting is connected to and supported by the upper flat end portion of the hollow conductor, and further, the hook metal fitting is in a plane of the upper flat end portion of the hollow conductor. It is preferable that the head is supported so as to freely swing along the head.

  Moreover, in the problem-solving means of the present invention, the conductor connecting portion includes a conductor joint including a pair of conductor joint halves that are respectively connected to the opposite ends of adjacent hollow conductors and fitted to each other. One conductor joint half has at least two retaining pins held by a small-diameter fitting portion into which the other conductor joint half is fitted, and the other conductor joint half is the one conductor joint half Half of the retaining pin has a retaining hole, and the retaining pin is retractable in the radial direction of the corresponding half of the conductor joint, but protrudes in the outer radial direction so as to be engaged in the retaining hole. It is preferable to be biased.

In this case, it is preferable that the one conductor joint half includes a leaf spring that holds the retaining pin and urges the two retaining pins in the outer diameter direction. Preferably, it has a U-shape and the retaining pin is held at the free end of the opening.

Furthermore, in the problem-solving means of the present invention, an axial extraction between these surfaces is arranged between the outer surface of the small-diameter fitting portion of the one conductor joint half and the inner surface of the other conductor joint half. It is preferable to have an interposition part for increasing the resistance, and this interposition part is more preferably in the form of a rounded head of a screw attached through a small diameter fitting part in the radial direction. When the portion is at a position corresponding to the leaf spring, the screw passes through the through hole of the leaf spring.

The hollow conductor is preferably made of an aluminum pipe, a copper pipe or other conductive pipe.

  According to the present invention, as described above, since the grounding rod body is mainly composed of a hollow conductor, the hollow conductor has a function as a grounding conductor and a function as an operation rod. The weight of the entire grounding rod can be reduced compared with the grounding rod of the prior art that separates the grounding rod, so that the operation of lifting the grounding rod for the purpose of hooking the grounding rod to the overhead wire is easy, and the grounding work of the overhead wire is improved. be able to.

It is a side view of the grounding rod for overhead wire construction by one embodiment of the present invention. FIG. 1 shows conductor connection portions of adjacent hollow conductors in FIG. 1, wherein FIGS. (A1) and (A2) are respectively a conductor joint half connected to one of the hollow conductors and a conductor joint connected to the other hollow conductor. The top view of the state which decomposed | disassembled the half part, the figure (B1) (B2) is the side view, and the figure (C) is the CC sectional view taken on the line (A1). FIG. 1 shows the hollow conductor at the uppermost end of FIG. 1, wherein FIG. 1A is a top view thereof, and FIG. 1B is a side view thereof. It is a top view of the hook metal fitting of FIG. 1 shows a ground wire connecting portion of the grounding rod of FIG. 1, wherein FIG. 1A is a top view thereof, FIG. 1B is a side view thereof, and FIG. C line sectional drawing and the figure (D) are DD line sectional views of the figure (B). It is a side view of the grounding rod of other embodiment of this invention. It is a front view of the hollow conductor and hook metal fitting of the uppermost end of the grounding rod of FIG. 6 shows the ground wire connecting portion of the ground rod of FIG. 6, wherein FIG. 6A is a top view thereof, FIG. 6B is a side view thereof, and FIG. FIG.

A grounding work grounding rod 10 according to one preferred embodiment of the present invention is shown in FIG. 1, and this grounding rod 10 is provided at a grounding rod body 20 and an upper end of a conductor described after the grounding rod body 20. Hook metal fitting 30 and a ground wire connecting portion 40 provided at the lower end of the conductor of the grounding rod body 20. Although FIG. 1 shows the grounding rod 10 arranged sideways, the hook metal fitting 30 on the left side of FIG. 1 is hooked on the overhead line when the overhead wire construction is used, and the ground wire connecting portion on the right side of FIG. Since the earth wire connected to 40 is connected to a grounding part such as a rail, the left side of FIG. 1 will be described as the upper side of the grounding rod 10 and the right side of FIG.

  The grounding rod main body 20 includes a plurality of, in the illustrated form, three hollow conductors 22A to 22C (generally indicated by reference numeral 22) and a conductor connecting portion 24 that connects adjacent hollow conductors 22. In the illustrated form, the hollow conductor 22 is made of an aluminum pipe. However, the hollow conductor 22 may be made of a pipe made of copper or other conductive material, and the number of the hollow conductors 22 may be two or four or more. It may be.

As shown in FIG. 2, the conductor connecting portion 24 is composed of a conductor joint 24P including hollow pipe-like conductor joint halves 24PA and 24PB formed of a conductive material such as brass. The halves 24PA and 24PB are fitted to the adjacent upper and lower hollow conductors 22A and 22B and fixed by screws 24SA and 24SB, respectively. 2 is opposite in direction to FIG. 1, the left side of FIG. 2 is the lower side of the grounding rod 10, and the right side of FIG. 2 is the upper side of the grounding rod 10.

  As is clear from FIG. 2C, one (lower) conductor joint half 24PB has a small-diameter fitting portion 24PBL into which the other (upper) conductor joint half 24PA is fitted, and this conductor joint half 24PA. At least two (one pair) of retaining pins 26P, which pass through the wall hole 24PBH of the conductor joint half 24PB in the radial direction, and the inner surface of the conductor joint half 24PB. And is held by a steel substantially U-shaped leaf spring 28 held in the conductor joint half 24PB by its own spreading elasticity, and the free end 28E of the leaf spring 28 is connected to the conductor joint half It has a push button 28B that penetrates the portion 24PB in the radial direction.

  When joining the conductor joint half part 24PB on the hollow conductor 22B side to the conductor joint half part 24PA, the push button 28B is pushed in the inner diameter direction so that the stop pin 26P is retracted from the outer surface of the small diameter fitting part 24PBL of the conductor joint half part 24PB; In this state, when the small-diameter fitting portion 24PBL of the conductor joint half 24PB is fitted into the conductor joint half 24PA on the hollow conductor 22A side and the push button 28B is released, the set pin 26P becomes the conductor joint half on the hollow conductor 22A side. The conductor joint half 24PB on the hollow conductor 22B side is joined to the conductor joint half 24PA by the stop pin 26P by engaging with the stop hole 24PAH of the 24PA, and therefore the lower hollow conductor 22B is connected to the conductor joint half 24PA, 24PB can be connected to the upper hollow conductor 22A with one touch.

  The other adjacent hollow conductors 22B and 22C are also connected with one touch through the same conductor joint 24P.

  In the illustrated embodiment, the leaf spring 28 is U-shaped and holds two retaining pins 26P at the free ends 28E on both sides thereof. However, the leaf spring does not have to be U-shaped and has two retaining pins. 26P may be respectively held by separate strip-shaped leaf springs, and these strip-shaped leaf springs may be respectively attached to the inner surface of the conductor joint half 24PB.

The conductor joint 24P is disposed between the outer surface of the small-diameter fitting portion 24PBL of one conductor joint half 24PB and the inner surface of the other conductor joint half 24PA to increase the axial pull-out resistance between these surfaces. It is preferable to have inclusions 24PP that act as follows. In the illustrated form, the inclusion 24PP is in the form of a round head 24PPSH of a screw 24PPS that is held through in the radial direction of the small-diameter fitting portion 24PBL of the conductor joint half 24PB. When in a position corresponding to the spring 28, the screw 24PPS passes through the through hole of the leaf spring 28 loosely. This inclusion 24PP is not appropriately placed on the conductor joint half 24PA side, that is, on the inner surface of the conductor joint half 24PA fitted to the small diameter fitting portion 24PBL of the conductor joint half 24PB, not on the conductor joint half 24PB side. It may be provided by the means.

The inclusion 24PP pushes the conductor joint half 24PA toward the head side of the screw 24PPS when the small-diameter fitting part 24PBL is inserted into the conductor joint half 24PA. Therefore, the conductor joint on the opposite side of the screw 24PPS It has a function of pressing the inner surface portion of the half portion 24PA against the small-diameter fitting portion 24PBL, and the joint halves 24PA and 24PB can be connected to each other in electrical and mechanical contact.

The hollow conductors 22A and 22B and their conductor joints 24P have an insulation coating layer 23 formed by coating a heat-shrinkable tube on the outer surface. In the illustrated form, fluorescent tape is applied to both ends of the insulation coating layer 23. The fluorescent layer 23L is formed by being wound. This has the function of facilitating construction at night. Although not shown, the hollow conductor 22C has a coating layer formed by applying an insulating material such as FRP.

  As shown in FIG. 1, the hook fitting 30 is composed of a hook conductor 32 and an insulating cover 34 covering the hook conductor 32, and the base 30B is the upper end of the uppermost hollow conductor 22A as shown in FIG. A flat portion 22AF formed by compressing and deforming the flat plate 22 is attached by a plurality of screws 36A and 36B and electrically and mechanically connected to the hollow conductor 22A.

As can be seen from FIG. 4, one screw 36 </ b> A for attaching the hook metal fitting 30 attaches the hook metal fitting 30 so as to swing freely, and the other screw 36 </ b> B passes through an arc-shaped through-hole 30 </ b> BH provided in the base 30 </ b> B of the hook metal fitting 30. It does not interfere with the swinging of the hook fitting 30 by penetrating. Therefore, since the grounding rod 10 can be disposed obliquely from the position where the hook metal fitting 30 is hooked on the overhead line or the like, even when the height from the grounding position to the overhead line is different, it can be grounded effectively. it can.

  As shown in FIGS. 1 and 5, the ground wire connecting portion 40 is made of aluminum or the like that is electrically and mechanically connected to the lower end of the lowermost hollow conductor 22 </ b> C and attached to the hollow conductor 22 </ b> C with a screw 42. And a cylindrical earth terminal fitting 44 made of a conductive material. As is apparent from FIG. 5D, the ground terminal fitting 44 has a recess 44R that extends across the terminal fitting body in the radial direction and into which the terminal 46T of the ground wire 46 is to be engaged. 46 is attached to the ground wire terminal fitting 44 by a screw 48 in the recess 44R and is electrically and mechanically connected.

  1 is assembled by sequentially connecting a plurality of hollow conductors 22 by means of conductor joints 24P, and then grounding metal fittings (not shown) connected to the ground wires 46 connected to the earthing terminal metal fittings 44 are connected to rails or the like. The grounding rod 10 is lifted and the hook fitting 30 is hooked on the overhead wire to ground the overhead wire. After the completion of the overhead wire construction, the hook fitting 30 is removed from the overhead wire, the grounding rod 10 is brought down to the ground, the grounding fixture is removed from the grounding portion such as a railroad rail, the conductor joint 24P is disassembled and divided into three hollow conductors 22 Transport and store.

  Since the hollow conductor 22 serves as both the operation rod and the connection conductor to the ground wire 46, the ground rod 10 has a conductor for connecting the ground wire inside and outside the operation rod, like the ground rod of the prior art. The overall weight is low compared to the above, and therefore the grounding rod can be easily lifted.

  In addition, since the assembly and disassembly of the grounding rod can be performed by a one-touch operation using a conductor joint, the assembly and disassembly of the grounding rod before and after the overhead wire work can be performed with high workability.

A grounding rod 100 according to another embodiment of the present invention is shown in FIG. 6, and this grounding rod 100 is composed of two hollow conductors 122A and 122B and one hollow insulator 122C. The upper hollow conductor 122A is curved in a square shape, and the lower hollow conductor 122B and the hollow insulator 122C are linear. The hollow insulator 122C can be formed of, for example, FRP. In the figure, reference numeral 123 denotes an insulating coating layer, and reference numeral 123L denotes a fluorescent layer, which are the same as the insulating coating layer 23 and the fluorescent layer 23L of the previous embodiment, respectively.

The hollow conductors 122A and 122B and the hollow conductor 122B and the hollow insulator 122C can be assembled and disassembled with one another by a joint 124P having the same structure as the conductor joint 24P of FIG. 2 used in the embodiment of FIG. Since it is connected so that it can do, detailed description is abbreviate | omitted.

  Using the same structure as in the embodiment of FIG. 1, the hook fitting 130 is swingably attached to the tip flat portion 122AF of the upper hollow conductor 122A as shown in FIG.

As shown in FIGS. 6 and 8, the ground wire connection portion 140 includes a ground terminal fitting 144 attached to the lower hollow conductor 122 </ b> B at the lower end exposed portion with a screw 142. The terminal 146T of the ground wire 146 is attached to the ground terminal fitting 144 with a screw 148 and is electrically and mechanically connected. In order to assist in securely fixing the ground wire 146 to the ground terminal fitting 144, a ground wire presser fitting 144A for pressing the end (terminal side end) of the ground wire 146 is provided. The both ends are fixed to the earth terminal fitting 144 by two screws 144AS.

  In the embodiment of FIG. 6, the hook metal fitting 130 is arranged so as to be displaced from the straight portion due to the curvature of the upper hollow conductor 122A. The grounding rod 100 can be suitably used when the grounding position such as a grounding bracket installed on the side of the rail is not directly below the overhead line as in the case where the grounding position is shifted from the rail.

  Also in this embodiment, since the hollow conductor serves as both the operating rod and the earth conductor, it can be easily lifted during the grounding work during the overhead wire work, and the hollow conductor and the hollow insulation before and after the work. Body assembly and disassembly can be easily done with a single touch.

  According to the present invention, as described above, since the hollow conductor of the grounding rod serves as both the operation rod and the grounding conductor, the grounding rod is reduced in weight as a whole, and the overhead wire grounding work during the overhead wire construction is high. It can be performed with good workability and has high industrial applicability.

DESCRIPTION OF SYMBOLS 10 Grounding rod 20 Grounding rod main body 22, 22A thru | or 22C Hollow conductor 22AF Flat part 23 Insulation coating layer 23L Fluorescent layer 24 Conductor connection part 24P Conductor joint 24PA, 24PB Hollow pipe-shaped conductor joint half part 24PBL Small diameter fitting part 24PP Inclusion 24PPS screw 24PPSH screw round head 24PBH wall hole 24SA, 24SB screw 26P retaining pin 28 leaf spring 28E free end 28B push button 30 hook metal fitting 30B base 30BH arc-shaped through hole 32 hook conductor 34 insulation cover 36A, 36B screw 40 ground Wire connection portion 42 Screw 44 Ground terminal fitting 44R Recess 46 Ground wire 46T Terminal 48 Screw 100 Ground rod 122A, 122B Hollow conductor 122AF Flat tip portion 122C Hollow insulator 123 Insulation coating layer 123L Fluorescent layer 124 Joint 130 Hook Ingredients 140 ground wire connection portion 142 screw 144 ground terminal fixture 144A ground wire bracing 144AS screw 146 ground wire 146T terminal 148 screws

Claims (9)

In the grounding work grounding rod comprising a grounding rod main body and a hook metal fitting provided at the upper end of the grounding rod main body, the grounding rod main body is constituted by a plurality of hollow conductors and a conductor connecting portion for connecting adjacent hollow conductors. And an insulating coating that at least partially covers the grounding rod body, and a ground wire connecting portion to which a ground wire is to be connected to the hollow conductor in the vicinity of the lower portion of the hollow conductor of the grounding rod body. A grounding rod for overhead wire construction.   2. The grounding work grounding rod according to claim 1, wherein the hook fitting is supported so as to be swingable along a flat surface of an upper end flat portion of the hollow conductor.   3. The grounding work grounding rod according to claim 1, wherein the conductor connection portions are connected to opposite ends of adjacent hollow conductors, respectively, and are attached to each other and fitted to each other. One conductor joint half has at least two retaining pins held by a small-diameter fitting portion into which the other conductor joint half fits, and the other conductor joint half One of the conductor joint halves has a retaining hole into which the retaining pin engages, and the retaining pin can be retracted in the radial direction of the corresponding conductor joint half, but protrudes in the outer diameter direction into the retaining hole. A grounding rod for overhead wire construction, which is biased to engage.   4. The grounding work grounding rod according to claim 3, wherein the one conductor joint half includes a leaf spring that holds the locking pin and biases the two locking pins in an outer diameter direction. A grounding rod for overhead wire construction.   5. The grounding work grounding rod according to claim 4, wherein the leaf spring has a substantially U shape, and the retaining pin is held by a leg portion on the opening side thereof. Ground rod for construction.   The grounding work grounding rod according to any one of claims 3 to 5, wherein the grounding rod is disposed between an outer surface of a small-diameter fitting portion of the one conductor joint half and an inner surface of the other conductor joint half. A grounding rod for overhead wire construction, having an interposition portion for increasing the axial pull-out resistance between these surfaces.   7. The grounding work grounding rod according to claim 6, wherein the interposition part is in the form of a rounded head of a screw attached through a small diameter fitting part in a radial direction. Ground rod for construction.   8. The grounding work grounding rod according to claim 7, wherein the interposition part is in a position corresponding to the leaf spring, and the screw passes through a through hole of the leaf spring. Ground rod for construction. 9. The grounding work grounding rod according to any one of claims 1 to 8, wherein the hollow conductor is made of an aluminum pipe or a copper pipe.

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