Construction method of flexible arch bridge with rigid beams

Abstract

The invention relates to a construction method of a flexible arch bridge with rigid beams. Steel truss beams, a steel box arch and flexible hanging rods are divided into single members in a factory and manufactured in a segmented mode; by the adoption of the symmetrical cantilever erection method, installation of the rigid steel truss main beam is completed firstly; then, an arch rib is installed, a crane travels on an upper bridge deck, the arch rib is divided into two half arches, welding forming is conducted on the two half arches on the upper bridge deck, the arch rib is vertically rotated in place through auxiliary facilities such as vertical rotating hinges, temporary sling towers and temporary inhaul cables between the arch rib and the steel truss beams, and middle span closing of the arch rib is achieved. After installation of the steel truss beams and the arch rib is completed, flexible slings are installed on the upper bridge deck and tensioned, and installation of the main structure is completed. By the adoption of the construction method that the steel truss beams are installed first and then the arch rib is installed, construction difficulty of the arch rib is reduced, the hoisting height of the crane is reduced, the construction period is greatly shortened, construction costs are lowered, economic benefits are increased, structural integrality and stability of the large-span arch bridge are enhanced in the construction process, and construction risk is reduced.

Description

technical field [0001] The invention relates to a construction method of a rigid beam flexible arch bridge. Background technique [0002] Different design and construction methods of long-span arch bridges directly affect the cost and construction period of the project. Reasonable construction technology can not only effectively shorten the construction period, but also bring considerable economic benefits. [0003] At present, there are two types of long-span arch bridges with double-deck decks: one is a combination system of rigid beams, flexible arches, and rigid suspenders. When installing arch ribs in this structure, the crane travels on the upper deck to fix the arch ribs. The other is a combination system of rigid arch flexible beams and flexible suspenders. When installing arch ribs in this structure, the crane walks on the truss arch to install arch ribs and suspenders. The main span of the dedicated channel bridge of the Hutong Yangtze River Bridge is 336m. The up...

AI Technical Summary

Problems solved by technology

The main span of the dedicated channel bridge of the Hutong Yangtze River Bridge is 336m. The upper layer is a 6-lane expressway and the lower layer is a four-line railway. The design live load is large and the design standard is high. The hoisting height of the crane is huge, and the installation cost of the arch is high; in addition, the boom is 60m long. Due to the requirement of slenderness ratio, the section size of the boom is large and the weight is heavy, which not only increases the burden on the arch ribs and beams, increases the project cost, but also increases Greater risk of wind-induced damage to the boom

If the rigid arch flexible beam and flexible suspender system are used, the construction and installation of the rigid arch are relatively complicated, resulting in high project cost

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