Crossover stringing method for overhead line and stringing sheave pulley

Abstract

The invention discloses a method for crossing stringing of overhead line and improvement on stringing tackle. The method comprises the following steps: a pulling cable is released and extends across an spanning object; the pulling cable is communicated with towers at two sides of a span; one end of the pulling cable is connected with a groundwire at a cable releasing side, while the other end pulls an overhead ground wire to cross the spanning object; when reaching a pulling end, the ground wire is loosened, so that at least one point in the span is lowered to or close to the ground; a pulley with a surrounding cable is hung upside down on the ground wire to tighten the ground wire; one end of the surrounding cable is pulled to make a trip stringing tackle which holds the pulling cable and a conducting wire and is hung on the other end of the surrounding cable lift and positioned over the spanning object; the pulling cable or the conducting wire on the stringing tackle is pulled to cross the spanning object till the spanning conducting wire is completely released or tightened; a strip door of the stringing tackle is pulled to be open to separate the conducting wire and the stringing tackle to complete the crossing stringing; after the cable releasing is completed, the strip stringing tackle is landed; and the surrounding cable is pulled to allow the pulley hung upside down to move to a tower on one side of the span to remove the pulley. A closable opening is arranged above a pulley of a pulley frame on at least one side of the strip stringing tackle. A movable door which can be turned down to be opened is arranged at the opening. The movable door is provided with a self-lock mechanism for preventing automatic opening. The self-lock mechanism is provided with a downward-pulled door chain.

Description

[0001] technology field [0002] The present invention is an improvement to the straddling stringing method and the stringing pulley of overhead lines, and particularly relates to a straddling stringing method and stringing method which is convenient and fast in construction, requires less workers, has a high safety factor, shortens the spanning time, and has strong versatility. pulley. Background technique [0003] Overhead lines, such as electric power overhead lines, sometimes need to be erected across other lines and roads, rivers, tall plant forests, crop fields, etc. (collectively referred to as crossing objects). The spanning operation is complex, the workload and difficulty are large, and the power outage time is long. For the erection across the line, there are many methods used in the prior art: landing is crossed over the lower line, or setting up the over-the-line frame. However, in the way of lowering the lower line, the lower line may be damaged during the lo...

AI Technical Summary

Problems solved by technology

This device is designed to solve the friction of dragging across the line. Not only does it need to be manually climbed to place this device on the line to be spanned, but each time a line is placed, the personnel need to climb up once, and the new line is in the process of traction. It will keep jumping up and down with the drag, and it is very easy to jump out of the device, and then the wire will rub against the lower crossing line, which is very prone to major accidents; similarly, this device can only be used for crossing lines, not suitable for roads, rivers, tall Plant forests, crop fields, etc. span, and the use is restricted

[0008] The above-mentioned spanning wiring methods and devices all have shortcomings such as complicated spanning wiring, many operators and high climbing times, poor safety, long construction time, and poor versatility, so there is still room for improvement

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