Net blocking system for crossing power line by using auxiliary cross arms and mounting and dismounting method of net blocking system

Abstract

The invention discloses a net blocking system for crossing a power line by using auxiliary cross arms, and relates to the field of construction of power transmission line projects. An existing crossing mode is very hard to implement and difficult to perform. The net blocking system comprises the auxiliary cross arms arranged on iron towers on two sides of the power line, steel wire rope main cables, a main cable fixing device and a blocking net, wherein the auxiliary cross arms are symmetrically and detachably arranged on two sides of the iron towers; the steel wire rope main cables are detachably fixed on the auxiliary cross arms and the iron towers through the main cable fixing device; the blocking net is arranged on the steel wire rope main cables; the steel wire rope main cables and the blocking net are located above the power line. The net blocking system disclosed by the invention is convenient to mount and dismount; under the condition that the allowable maximum single lateral horizontal tension of the auxiliary cross arms can bear the tension of the blocking net, backside ground stay wires of the auxiliary cross arms and the iron towers can be canceled; the problem that thebackside ground stay wires cannot be erected due to mountain steepness is solved; by adoption of a high-altitude net blocking mode, the net blocking is easier and more convenient, and the time can besaved; the accompanying stop time of a power line below is shortened; and the overall construction cost of the net blocking system is reduced.

Description

technical field [0001] The invention relates to the field of power transmission line engineering construction, in particular to a network sealing system using auxiliary cross-arms to cross power lines and methods for its installation and removal. Background technique [0002] At present, in the mountainous construction of some existing power lines, due to the rugged and steep terrain, large spans, large spanning range, and high height of the crossed power lines, the construction is more complicated. For example, the Ninghai Power Plant is connected to the Mingzhou Substation The G8-G9 gears of the 500 kV line project also crossed a 500kV double circuit and two 220kV double circuits, a total of 6 important power lines. The G9 span is 226m, and the 6 crossed power lines are distributed within the range of 126m, and the intersection angles are all 48 degrees; the height of the crossed power lines is between 55-60m. The feasibility of several spanning methods commonly used in t...

AI Technical Summary

Problems solved by technology

The auxiliary cross arm can be installed at the same time when the iron tower is assembled, and can be disassembled separately after the project is completed. It is easy to install and disassemble, and can be used again in other places; When the horizontal tension can withstand the tension of the net sealing, the auxiliary cross arm and the anti-side landing cable of the iron tower can be cancelled, which solves the problem that the mountainous terrain is steep and the anti-side landing cable cannot be erected; by adopting the high-altitude net sealing method set above the power line to seal the net Instead of the traditional overall network closure, the network closure operation is simpler, faster, and time-saving, which simplifies the network closure process, greatly reduces the downtime of the power line below, and reduces the overall construction cost of the network closure system

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