Secondary vertical rotation construction method of long-span steel pipe arch bridge

Abstract

The invention discloses a secondary vertical rotation construction method of a long-span steel pipe arch bridge, which comprises the following steps: arranging lifting rotation hinges and lowering rotation hinges according to terrains, backward bending steel pipe arches at the upper parts of the lifting rotation hinges, dispersedly splicing the steel pipe arches on a supporting frame along a mountain body, carrying out upward lifting and downward vertical rotation construction by technology which uses a computer to control integral lifting and lowering operation and sequentially installing an arch top closure section and an arch springing closure section so as to complete the installation of the steel pipe arches. The invention has the advantages of ensuring the construction quality, improving the construction efficiency and reducing the construction safety risk and can be popularized to bridge construction under the similar condition.

Description

technical field [0001] The invention relates to a bridge construction method, in particular to a secondary vertical rotation construction method for a large-span steel pipe arch bridge on a railway or highway in a "V"-shaped canyon in a mountainous area. Background technique [0002] With the rapid development of my country's national economy, the number of railway and expressway construction projects is increasing, and the long-span steel pipe arch bridge scheme has become the first choice for crossing mountains and valleys in my country. The construction of long-span steel pipe arch bridges mainly adopts the traditional segmental cantilever assembly method of cable cranes. This construction method has the following problems: [0003] 1. The segmental cantilever assembly method of the cable crane is used to install the steel pipe arch bridge. During the construction process, the steel pipe arch bridge is a large cantilever structure supported by flexible cables. The stiffne...

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Problems solved by technology

[0003] 1. The segmental cantilever assembly method of the cable crane is used to install the steel pipe arch bridge. During the construction process, the steel pipe arch bridge is a large cantilever structure supported by flexible cables. The stiffness is small, and the deformation is not suitable for control, especially in mountainous canyons where the wind speed is high and the structural stability is poor. , security issues are very prominent

[0004] 2. The segmental cantilever assembly method of the cable crane is used to install the steel pipe arch bridge. The connection between the segments is a high-altitude operation, and the installation is difficult.

Welding is in the air, the working platform is supported by flexible suspension, and the welding position of some welding seams is overhead welding, so the welding quality of the welding seams is difficult to guarantee

[0005] 3. The segmental cantilever assembly method of the large-tonnage cable crane is used to install the steel pipe arch bridge. It is necessary to set up a hanging buckle system, and the cable needs to be adjusted continuously during the installation process, and the operation is relatively complicated.

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