JP2001080392A - Insulative crossarm for electric railway - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sufficient insulation clearance and strength by means of a simple structure by coaxially connecting a supporting metal fitting lockable to a structure to one end of an insulator while connecting an L-shaped hanging metal fitting to the other end for integrally constituting an insulative crossarm and connecting a suspension clamp at the tip of the L-shaped hanging metal fitting for gripping an AT feeder. SOLUTION: In the insulator 1, connection flanges 1a, 1b are arranged in both ends. A supporting metal fitting 2 provided with connection flanges 2a, 2b in both ends is connected coaxially and integrally to the connection flange 1a via one connection flange 2a by means of a bolt and mounted on a supporting structure S via the other connection flange 2b. The L-shaped hanging metal fitting 3 is provided with a connection flange 3a in one end so as to be connected coaxially with the other end flange 1b of the insulator by means of a bolt with the tip directed downward. A suspension clamp 6 is constructed of a connecting metal fitting 6a having bolt holes in the upper and lower ends orthogonally to each other and a feeder clamping clip 6b in the lower part, each of them is connected by means of a bolt rotationally around the bolt axis, and an AT feeder is clamped by means of the feeder clamping clip 6b and connected by means of a bolt so as to be suspended in the structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In an AC electrification section, AT
The present invention relates to an insulating arm for supporting a train line such as a feeder wire to a structure.

[0002]

2. Description of the Related Art Electric current in a train line flows from a substation to a trolley line through a feeder line. A train collects electricity from a trolley wire and runs with the rotation of a drive motor. After that, electricity flows from the wheels to the rails and returns to the substation by return. Autotransformer (Auto Transforme)
The circuit configuration in the AC electrification section of the so-called AT feeding system using r) is based on the above flow. Typical feeder lines are the AT feeder (commonly known as AF) and A
There are T protection lines (commonly known as PW), all of which are attached along the trolley line and supported by structures provided at appropriate intervals. FIG. 4 shows a conventional example of such a train line support structure. The trolley wire T is gripped by the tip ear of the curved trigger 11 attached to the lower horizontal member of the movable bracket K, and the suspension wire M for suspending the trolley wire is supported on the upper horizontal member of the movable bracket K. . The AT feeder wire (AF) and the AT protection wire (PW) are supported by a support device provided above the movable bracket. In this supporting device, one end of an arm bar 12 is fixed to a utility pole P with a utility pole band 13, a plurality of suspension insulators 14 are connected to a tip thereof, and the suspension insulator 14 is hung down. Support with. A power pole band 15 for a reinforcing member is attached to a power pole above the arm, and an AT protection line (PW) is hung by a suspension metal fixture fixed to an outer surface of the power pole band.

[0003]

The electric power line has a high voltage (AC).
The use of 20-25 KV) requires sufficient insulation separation from the support structure. Also in the AT feeder wire, three to four suspension insulators 14 are suspended from the arm 12 and are supported at the lower ends thereof. Therefore, the supporting structure needs to have a sufficient height for providing sufficient insulation separation and a strength for supporting the weight of the insulating metal fittings and the like, and is extremely large. This is not suitable for the surrounding environment and may damage the landscape. Further, since the supporting member is heavy and the assembling work at a high place at night involves danger, much time is spent for the construction.
An object of the present invention is to provide an insulation arm for a train line that has a simple structure, can secure sufficient insulation separation and strength, can be easily mounted, and can reduce a supporting structure such as a telephone pole.

[0004]

According to the present invention, there is provided an insulated arm for a train line, in which a support fitting engageable with a support structure is connected to one end of an insulator, and an L-shaped suspension fitting is connected to the other end. Each is coaxially configured. A suspension clamp in which the connection fitting and the wire gripping clip are rotatably connected is prepared, and this is connected to the end of the connection fitting and the tip of the L-shaped suspension bracket in a direction perpendicular to the rotation direction of the wire gripping clip. The cable is rotatably connected and hangs down, and the AT feeder wire is supported by the wire gripping clip. In the insulated arm, for example, a support bracket is fixed to one arc piece of a utility pole band composed of a pair of opposed arc pieces, and a suspension bracket capable of suspending an AT protection line is provided outside the other arc piece,
Make it attachable to telephone poles. In addition, a lightweight and highly durable polymer insulator is used for the insulator.

[0005]

1 to 3 show an embodiment of the present invention. The insulator 1 has connection flanges 1a and 1b at both ends. The support bracket 2 has connection flanges 2 at both ends.
a and 2b, one of which is bolted coaxially with the connection flange 1a and attached to the support structure S by the other connection flange 2b. The L-shaped hanging bracket 3 has a connecting flange 3a at one end and the other end flange 1b of the insulator.
Connect the bolt with the tip coaxial with the tip downward. The suspension clamp 6 includes a connection fitting 6a having upper and lower ends with bolt holes drilled in a direction perpendicular to each other, and a lower electric wire gripping clip 6b, each of which is bolted rotatably around a bolt axis. At 6a, the AT feeder wire is gripped, and one end bolt hole of the connecting bracket is rotatably bolted to the tip bolt hole of the L-shaped hanging bracket 3 to be suspended. Even if the electric wire oscillates due to wind or the like, the movement is freely permitted by the connection of the suspension clamp, so that the electric wire is not damaged at the support point.

FIG. 2 shows a case where an insulating arm is attached to a utility pole. The electric pole band 4 is composed of a pair of opposed arc pieces 4a and 4b, and the end of the support metal is fixed to one arc piece 4a, and a support rod 5 is protruded in the horizontal direction outside the other arc piece 4b. Then, a hanging ear 5a is provided at the tip end thereof, and the electric pole P of the supporting structure is held and attached. A suspending clamp having substantially the same shape as that suspended from the L-shaped suspending bracket is rotatably suspended from the suspending ear, and the AT protection line is gripped by a lower end clip and suspended.

FIG. 3 shows a case in which the apparatus of the present invention is provided standing on a horizontal support structure S and used. Insulator 1
At both ends, the support fitting 2 and the L-shaped hanging fitting are connected integrally by respective flanges, and the support fitting 2 is placed and fixed on the support structure S. The hanging clamp 6 is rotatably hung on the front end 3b of the L-shaped hanging bracket, and the AT electric wire (AF) is gripped and suspended by the electric wire gripping clip 6a at the lower end.

The insulator is generally made of porcelain, but a polymer insulator (composite insulator) may be used. Since the polymer insulator is resistant to fouling, insulation continuity can be ensured. Also, since it is lightweight and has high strength, downsizing and simplification can be achieved. This results in a low and simple support structure, which greatly reduces the overall equipment cost. The arm device of the present invention is all assembled in a factory,
At the work site, only installation work to the support structure is required, and workability and maintainability in high-altitude work are ensured. Although the above description has been made by taking an example in the case of an AC electrification section, it is obvious that the present invention is not limited to this and can be used in a DC electrification section.

[0009]

According to the present invention, one end of the insulator is coaxially connected with a support fitting engageable with a support structure, and the other end is connected with an L-shaped suspension fitting to integrally form an insulating arm. Since the suspension clamp is hung at the tip of the mounting bracket to hold the AT feeder wire, it is possible to secure sufficient insulation and high strength with a simple structure. At the work site, only the work of attaching to the supporting structure with bolts is required, so that safety can be ensured and work efficiency can be improved even when working at heights or at night. In addition, because the suspension insulators are not used as in the past, even if the support position of the trolley wire is the same, the insulation arm bracket can be installed at a low mounting position, and it is also applicable to slim support structures that are low in height and do not require high strength it can. Therefore, the cost of the entire equipment can be significantly reduced. By using lightweight, high-durability and insulating polymer insulators for insulators, weight reduction and longevity are achieved, further improving the above-mentioned maintainability, workability and cost reduction of supporting structures. be able to.

[Brief description of the drawings]

FIG. 1 is a front view of an insulation arm for a train line according to the present invention.

FIG. 2 is a front view showing another embodiment of the insulation arm for a train line.

FIG. 3 is a front view showing another embodiment of an insulation arm for a train line.

FIG. 4 is a front view of a conventional insulating arm.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulator 1a, 1b flange 2 Supporting bracket 3 L-shaped suspension bracket 3a flange 4 Telegraph pole band 4a, 4b Arc piece 5 Supporting rod 5a Hanging ear 6 Suspension clamp 6a Wire gripping clip 6b Connection bracket 11 Curve trigger 12 Arm clamp 13 Power pole band 14 Suspension insulator 15 Power pole band AF AT feeder wire PW AT protection wire

Claims (3)

[Claims] 1. A support fitting engageable with a support structure at one end of an insulator and an L-shaped suspension fitting at the other end are coaxially and integrally connected, respectively, so that the connecting fitting and the wire gripping clip can be rotated. The connected hanging clamp is suspended by connecting the connecting bracket to the tip of the L-shaped hanging bracket so as to be rotatable in a direction perpendicular to the rotating direction of the wire gripping clip, and the AT feeding wire is gripped by the wire gripping clip. An insulated arm for a train line, characterized in that it can be gripped. 2. A supporting bracket fixed to a utility pole band for fixing the supporting bracket around a utility pole, and a hanging bracket capable of suspending an AT protection line is provided on a side of the utility pole band opposite to the supporting bracket,
The insulated arm for a train line according to claim 1, wherein the arm is attachable to a telephone pole. 3. The insulation arm for a train line according to claim 1, wherein the insulator is made of a polymer insulator.