One-side overall hoisting of large-span flyovers across multiple railway business lines and its construction method

Abstract

The invention relates to a large-span overpass integrally hoisted on one side across multiple railway business lines, including the middle span of the bridge, side spans of the flyover, reinforced concrete columns, fixed positioning devices and multiple railway business lines; The steel truss structure of the business line, the long-span flyover includes the middle span of the flyover and the side spans of the flyover. The beneficial effects of the present invention are: the overall assembled large-span steel truss overpass of the present invention is prefabricated by engineering, assembled on site as a whole, and finally hoisted by a large-tonnage crane. The assembly of the steel truss overpass is convenient, the installation period is short, and the construction window application for existing lines is reduced. Time, so that the upper construction changes the existing line into a non-existing line, which greatly reduces the impact on the running line, and has considerable social benefits and high promotion value.

Description

technical field [0001] The invention belongs to the technical field of overpasses, and in particular relates to a large-span overpass integrally hoisted on one side across multiple railway business lines and a construction method. Background technique [0002] In recent years, with the rapid development of national railways, the number of trains has increased, and the original station yards have been unable to receive multiple trains at the same time, and the number of platforms can no longer meet the requirements. In order to solve this problem, all stations across the country have expanded the original station, and at the same time ensured the normal operation of the station. Pedestrian bridges spanning multiple railway business lines, due to the large traffic flow of the railway below and the complex surrounding environment, there are few pier positions to choose from, so large spans are often selected. At the same time, in order to ensure the normal operation of railway ...

AI Technical Summary

Problems solved by technology

[0003] The overall assembled long-span steel truss bridge has a large span, high section, heavy weight, and the joints are welded joints, and it is constructed on the existing line. The project site installation is extremely difficult. The load-bearing support is erected, and falling objects from high altitude will pose a danger to the running railway line below, and the large amount of on-site engineering requires a long power outage window, which greatly interferes with the operating line and poses a great problem to construction management; large-span steel The hoisting and precise fixing and positioning of the truss overpass are very difficult. If the hoisting is not done properly, the operation line will be seriously affected, and the stability and safety of the steel truss overpass will also be adversely affected.

At the same time, steel bars, sharp objects, concrete materials, etc. may fall during the overall hoisting and subsequent engineering construction of the steel truss overpass, which will cause harm to the operation of the business line and construction personnel under the overpass. Therefore, it is necessary to set up guardrails to meet the Safety protection requirements, however, this type of guardrail is usually a temporary protective structure, which needs to be dismantled after the project is completed. There are problems such as waste of materials, difficulty in dismantling, and environmental pollution. At the same time, it also greatly increases the workload of construction and improves The project cost and construction difficulty

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