JP2010195247A - Rigid train line and its corrosion preventive structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To narrow a range of corrosion of an aluminum rigid train line due to bimetallic contact and pit corrosion under an environment, at which salt is included. <P>SOLUTION: An aluminum frame 1 of a rigid train line is constituted long along a rail, and is formed into an almost reverse cross section U-shaped, in which a pair of leg pieces 3 are hang from an upper piece 2. A trolley line T is plated with tin. An ear piece 4 is continued to a bottom end of the leg piece 3, and fastened with a bolt 5 and a nut 6 inserted in both of the leg pieces 3, 3, so as to grip the trolley line T with the ear pieces 4, 4. In the frame 1, an insulation support part 7 whose surface is insulated except for a non-insulation part 7a contacting continuous plates 9, 10 is connected with a conductive support part 8 whose surface is not insulated in an extension line direction. The continuous plate 9, 10 are pressed to the leg pieces 3 across a joint of the insulation support part 7 and the conductive support part 8, and fastened and fixed with a bolt 11. Bimetallic contact corrosion and pit corrosion are prevented at a contact part of the insulation support part 7 and the trolley line T, so as to secure power supply to the trolley line T with the conductive support part 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement of a rigid train line, and in particular, to reduce the contact corrosion and pitting corrosion of dissimilar metals with a trolley line.

Conventionally, a rigid train line has an upper piece and a pair of leg pieces suspended from the upper piece, extends along the rail, and bolts the leg pieces at equal intervals of about 250 mm to form a trolley line. A long aluminum pedestal for gripping is provided (see Patent Document 1). The rigid train line that feeds power to the trolley line through this gantry has small height and light weight, and therefore has the advantages of reducing the burden of maintenance and driving safety, and has recently been introduced in subways and narrow tunnels. However, since copper or stainless steel is used for the trolley wire, when water droplets adhere to the contact portion between the aluminum gantry of the rigid train line and the trolley wire, dissimilar metal contact corrosion occurs, and the gantry is significantly corroded.
On the other hand, as described in Non-Patent Document 1, it has been proposed to apply tin plating to the outer peripheral surface of the trolley wire. However, when this trolley wire is supported by the above gantry, if salty water adheres, tin plating intervening in the contact portion with the gantry diffuses to the gantry side, and pitting corrosion may occur in the gantry. It is not enough as a countermeasure against contact corrosion of dissimilar metals in the environment near the coast.

Japanese Patent Laid-Open No. 7-9896

2005 IEEJ Industrial Application Division Conference Paper “Verification of Mechanism of Corrosion Degradation between Aluminum Mount for Rigid Train Line and Tin-plated Trolley Wire” on page III-237

  Therefore, the problem of the above-mentioned conventional rigid train line is solved, and the occurrence range of dissimilar metal contact corrosion and pitting corrosion of the aluminum rigid train line is reduced as much as possible, while ensuring the power feeding performance, the aluminum rigid train line It is an object of the present invention to provide a rigid train line that improves durability, reduces maintenance burden, and improves reliability in terms of driving safety.

In the present invention, in order to solve the above-mentioned problem, an ear piece 4 having an upper piece 2 and a leg piece 3 suspended from the upper piece, extending along the rail and provided at the lower end of the leg piece 3. The trolley wire T is provided with a gantry 1 made of aluminum or an alloy thereof, and a rigid electric train line is configured to supply power to the trolley wire T through the gantry 1. The gantry 1 connects the insulating support portion 7 and the conductive support portion 8 in the extending direction to be electrically conductive, and the insulating support portion 7 supports the trolley wire T while being electrically insulated. The conductive support portion 8 supported the trolley wire T while being electrically connected.
The insulating support portion 7 was connected to the conductive support portion 8 via the conductive connection members 9 and 10, and the surface was subjected to insulation treatment except for the contact portion with the connection members 9 and 10.

The present invention can prevent different metal contact corrosion and pitting corrosion with the trolley wire in the insulating support portion, can improve the durability of the rigid train wire, and the insulating support portion and the conductive support portion are electrically connected. Therefore, the conductive performance inside the gantry can be secured, and the trolley wire can be reliably fed through the conductive support portion. Also, with regard to dissimilar metal contact corrosion and pitting corrosion, it is only necessary to inspect only the conductive support part, so it can be dealt with easily and quickly by replacing the conductive support part as necessary, and the burden of maintenance is reduced. Can be reduced.
By applying insulation treatment to the surface of the insulation support part, when a metal balloon is accidentally released at a subway platform, the insulation support part can prevent train operation troubles due to ground faults, and safety in train operation Can be improved.

It is a perspective view of a rigid train line. It is a front view of a rigid train line. It is a top view of a rigid train line. It is a side view of a rigid train line. It is a disassembled perspective view of the connection part of a rigid body line.

Embodiments of the present invention will be described with reference to the drawings.
In FIGS. 1 to 4, the base 1 of the rigid train line is made of aluminum or aluminum alloy, which is a conductive metal, and is a long body extending along the rail. The gantry 1 has a substantially cross-sectional shape in which a pair of leg pieces 3 having a vertical plate surface is suspended from an upper piece 2 having a horizontal plate surface.

  The lower end of the leg piece 3 is continuous with an ear piece 4 extending obliquely downward to the opposite side. The ear piece 4 engages with the grip grooves on both sides of the upper portion of the trolley wire T to grip the trolley wire T. A thin portion is provided at the center of the upper piece 2 to provide flexibility. When the nut 6 is tightened into the bolt 5 inserted through the bolt insertion hole 3a below the leg pieces 3 and 3, the leg pieces 3 and 3 are tightened and the ear pieces 4 and 4 hold the trolley wire T.

  The gantry 1 is configured by connecting an insulating support portion 7 whose surface is insulated and a conductive support portion 8 whose surface is not insulated in a wire extending direction. The insulating support portion 7 is obtained by applying an insulating material to the surface of the mold material constituting the gantry 1 except for a part. The ear piece 4 grips the trolley wire T but does not make direct electrical contact. A non-insulating portion 7a where an insulating material is not applied is formed by masking the contact portion of the insulating support portion 7 with the connection plates 9 and 10. The conductive support portion 8 can be electrically connected to the trolley wire T by gripping the trolley wire T with the ear piece 4 and can supply power through the gantry 1. Connections 9 and 10 are used to connect the joint between the insulating support 7 and the conductive support 8. The connecting plates 9 and 10 are strip-shaped aluminum or aluminum alloy material, and are applied to the leg pieces 3 so as to straddle the joint between the insulating support portion 7 and the conductive support portion 8. Is fixed by tightening. The connection plates 9 and 10 mechanically connect the insulating support portion 7 and the conductive support portion 8 and electrically connect the insulating support portion 7 and the conductive support portion 8 through the non-insulating portion 7a. The current-carrying capacity necessary for supplying power to the trolley wire T through the gantry 1 is secured. The connection plates 9 and 10 and the leg piece 3 have bolt holes 9a, 10a and 3b. The lower sides of the connecting plates 9 and 10 are placed on the heels of the leg pieces 3, and the upper sides are inclined at the front and rear end portions to facilitate insertion into a rectangular space between the lower surface of the upper piece 2 and the upper surface of the ear piece 4. In addition, by press-fitting, the lower surface of the upper piece 2 and the upper surface of the ear piece 4 are strongly abutted to increase the rigidity of the seam portion, prevent downward bending at the seam portion, so that no step occurs in the trolley wire seam. It has become.

  In this rigid train wire, since the contact portion between the ear piece 4 and the trolley wire T in the insulating support portion 7 constituting the gantry 1 is prevented from different metal contact corrosion and pitting corrosion, the durability of the rigid train wire is improved. . Further, the insulating support portion 7 and the conductive support portion 8 are electrically connected via the non-insulating portion 7 a and the connection plates 9 and 10, so that the conductive performance of the gantry 1 can be secured, and the ear piece 4 of the conductive support portion 8. The trolley wire T is reliably fed through. For the inspection work of dissimilar metal contact corrosion and pitting corrosion on the gantry 1, it is sufficient to focus on the contact portion between the conductive support portion 8 and the trolley wire T, and only the conductive support portion 8 is replaced if necessary. Since it is possible to respond easily and quickly, the maintenance work load is greatly reduced. In addition, even if a metal balloon accidentally released at the subway platform contacts the gantry 1, the ground support is prevented by the insulating support portion 7 that occupies most of the gantry 1, and driving troubles are prevented.

  In the above embodiment, the gantry has a bowl-shaped cross section. However, the present invention is not limited to this, and a T-shaped structure in which a separate ear piece is bolted to a single leg piece. Also about a thing, it is comprised by an insulation support part and a conductive support part, and can apply similarly.

  The present invention is effective in reducing the range of occurrence of dissimilar metal contact corrosion and pitting corrosion of a rigid train line at a contact portion with a trolley wire.

DESCRIPTION OF SYMBOLS 1 Base 2 Upper piece 3 Leg piece 4 Ear piece 5 Bolt 7 Insulation support part 8 Conductive support part 9 Connection board 10 Connection board 11 Bolt T Trolley wire

Claims (3)

It has an upper piece and a leg piece suspended from the upper piece, and includes a frame made of aluminum or aluminum alloy that extends along the rail and can grip the trolley wire on the ear piece provided at the lower end of the leg piece. However, in the rigid train line that feeds power to the trolley line through the gantry,
The gantry includes an insulating support portion and a conductive support portion that are connected in the extending direction and are electrically conductive. The insulating support portion supports the trolley wire while being electrically insulated, and the conductive support portion is a trolley wire. A rigid train line characterized by supporting the line while being electrically connected.   The insulating support portion is connected to the conductive support portion via a conductive connecting member, and the surface is subjected to insulation treatment except for the contact portion with the connecting member. Rigid train line. A base made of aluminum or an aluminum alloy, having an upper piece and a leg piece suspended from the upper piece, extending along the rail, and a cradle capable of gripping the trolley wire on the ear piece provided at the lower end of the leg piece It has a structure of a rigid train line that feeds power to the trolley line through this mount,
The above-mentioned gantry has a rigid train wire characterized in that a conductive support portion that supports a trolley wire while being electrically connected is interposed in an extending direction in an insulating support portion that supports the trolley wire while being electrically insulated. Corrosion prevention structure.

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