Construction method for erecting electrified railway uplink and downlink crossover contact net

Abstract

The invention belongs to the technical field of electrified railway contact net construction, and particularly relates to a construction method for erecting an electrified railway uplink and downlinkcrossover contact net. The construction method for erecting the electrified railway uplink and downlink crossover contact net is good in construction effect. The construction method includes the following steps that 1), an anchoring section is divided into two parts from the position of an uplink and downlink crossover section insulator, the distances between the center of the section insulator and an adjacent main track and between the center of the section insulator and the center of a crossover line are equal, and the center of the section insulator is a decomposition point; the anchoring section from the decomposition point to a hard anchor is L1, and the prefabrication length is Lx; anchoring section prefabrication is carried out according to the prefabrication length Lx of the anchoring section; the anchoring section from the decomposition point to a full compensation lower anchor end is L2, and the total length of the anchoring section is L; 2), anchor hauling is carried out, the anchoring section L1 and the anchoring section L2 are synchronously erected, a first insulator is connected, anchor falling is carried out, suspension adjusting is carried out, and power is supplied; and 3), the first insulator is replaced with the section insulator through a following skylight.

Description

technical field [0001] The invention belongs to the technical field of electrified railway catenary construction, and in particular relates to a construction method for erecting an electrified railway up and down crossing line catenary. Background technique [0002] When adding or rebuilding an uplink and downlink crossover on an existing electrified railway, it is necessary to use the hanging skylight (stopping time) to erect the uplink and downlink crossover catenary and install segmental insulators. In the past construction, the catenary erection of the uplink and downcrossing lines is to install the uplink and downlink insulators and section insulators on site in the same skylight after erecting the catenary cable or the anchor section of the catenary line as a whole. This method requires a long time to hang down , for catenary cables or contact wires with a length of 400-500 meters, the vertical skylight time required for erecting and installing insulators for the entir...

AI Technical Summary

Problems solved by technology

In the past construction, the catenary erection of the uplink and downcrossing lines is to install the uplink and downlink insulators and section insulators on site in the same skylight after erecting the catenary cable or the anchor section of the catenary line as a whole. This method requires a long time to hang down , for catenary cables or contact wires with a length of 400-500 meters, the vertical skylight time required for erecting and installing insulators for the entire anchor section is about 60-70 minutes, and the insulators installed on site are prone to position deviation (the premise of accurate insulator installation is the clue Erection and preliminary adjustment are in place, and the state is stable. Generally, the hanging time is short, and the time for erecting the wire takes up a long time. The reinforcement and adjustment of the clues are often not in place, which will affect the position accuracy of the insulator. In addition, the on-site installation of the insulator requires positioning measurement. During installation, the leads at both ends are connected to the wedge-shaped clamps, and the connecting heads here need to be made by hand, and due to the tight time of the skylight, the measurement error of the workers is large, and the size error of the head processing on site cannot be ignored), which affects the safe operation of the segmental insulator

[0003]Due to the busy traffic on the main railway line, the suspension of the skylight requires simultaneous power outages of the upper and lower catenary, which has a great impact on railway transportation. The time of suspension of the skylight approved by many hub stations is average It takes about 40 to 50 minutes, and the number of skylights is small, which is often canceled due to transportation adjustments and weather effects. Therefore, the erection of crossover catenary and the installation of segmental insulators have a long construction period and high construction costs. Blindly increase construction workers to engage in surprise construction safety There are many hidden dangers, and the traditional construction technology can no longer meet the requirements of shorter hanging skylights

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