The construction method of dismantling the cross-beam support of the portal pier on the existing railway line at a short distance

Abstract

The invention belongs to the field of beam body construction supports of existing lines and other narrow space of highway and railway overcrossing traffic roads or railways, and particularly relates to a construction method of dismantling a gate type pier beam support of a close-range overcrossing railway existing line. The gate type pier beam support comprises a main skeleton composed of a bottomsteel pipe column (comprising sandboxes) supporting system, an upper two-splicing I56 H-shaped steel cross beam and an I56 H-shaped steel longitudinal beam and a construction platform located on themain skeleton, and the construction platform comprises a top surface bamboo plywood retrofitting insulating plate, an I20 H-shaped steel distribution beam bottom die supporting system and a steel tubeguard bar. According to the construction method of dismantling the gate type pier beam support of the close-range overcrossing railway existing line, firstly, a work platform needs to be separated, the height of the construction platform can be integrally, balancedly and stably can be reduced through the sandboxes, and limiting rods are arranged at the two sides of each sandbox to ensure the sedimentation and balance of the sandboxes at the two sides; the gate type pier beam support is dismantled layer by layer from top to bottom, an auto crane is adopted to perform suspension in sequence from top to bottom to achieve the purpose that the support is dismantled safely and stably; when the support is dismantled, lifting operation needs to be carried out on a blocking point, passenger traffic railways black out, and lines under a gate type pier and adjacent lines are blocked.

Description

technical field [0001] The invention belongs to the field of beam body construction support removal in narrow spaces such as roads and railways crossing traffic roads or existing railway lines, and specifically relates to a construction method for dismantling cross beam supports of portal piers crossing existing railway lines at short distances. Background technique [0002] With the needs of the continuous development of the social economy, the requirements for railway transportation volume and transportation efficiency are getting higher and higher. The pace of reconstruction of existing lines and construction of new lines is accelerating. How to rationally organize the construction of the three-dimensional intersection between the new line and the existing line is particularly important to ensure the safety of the existing line and the construction period of the new line. In the construction of portal pier projects of newly built hub railways, it is often necessary to spa...

AI Technical Summary

Problems solved by technology

In the construction of portal pier projects of newly built hub railways, it is often necessary to span the existing lines. The nearest part of the support removal is relatively close to the catenary, sometimes only more than 50 cm away, which is an ultra-close construction, and both sides of the support can be existing lines , the construction work space is narrow, the engineering construction is difficult, and the safety risk is high

Images