Concrete arch bridge arching method

Abstract

Provided is a concrete arch bridge arching method which is suitable to be used for a huge-scale concrete railway long span arch bridge. Under the condition of not increasing the cross section size of a main arch ring, the method effectively reduces pressure stress of outer wrapped concrete on the position of the main arch ring, poured in early time, so load carrying of arch rings is more uniform, and related specification requirements are satisfied. A concrete arch bridge comprises a concrete filled steel tube stiff skeleton and an outer wrapped arch ring concrete structure. After pouring of a side box bottom plate of the outer wrapped arch ring concrete structure is completed, a certain range of an arch springing is selected, and a whole-section outer wrapped arch ring concrete structure is firstly formed, and unbalance loading on the main arch ring is adjusted through stretching a certain number of arch springing whole-section outer wrapped segment buckle cables and arch springing whole-section outer wrapped segment back cables, and the arch springing whole-section outer wrapped segment buckle cables and the arch springing whole-section outer wrapped segment back cables are removed after a side box concrete cross section of the outer wrapped arch ring concrete structure is completely formed.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to an arching method for a stiff skeleton concrete arch bridge. Background technique [0002] With the rapid development of high-speed railways in my country in recent years, a large number of high-speed railway long-span bridges across mountainous and canyon terrains will inevitably emerge. As a commonly used bridge type, concrete arch bridges not only have a large spanning capacity, but also have a large overall rigidity. The temperature deformation is small, and it can be well combined with the canyon terrain. It has become the main bridge type for high-speed railways to cross the canyon terrain. The Beipanjiang Bridge (main span 445m) of the Shanghai-Kunming Passenger Railway, the Nanpanjiang Bridge (main span 416m) of the Yunnan-Guizhou Railway, and the Yelang River Bridge (main span 370m) of the Yuqian Railway are all concrete arch bridges under construction. [000...

AI Technical Summary

Problems solved by technology

[0004] However, the inventor of the present application found that the traditional arching method adopted by the Wanxian Yangtze River Bridge still has deficiencies, because there is no effective means to adjust the concrete stress of the arch circle in time during the outsourcing concrete pouring process.

Images