关键词: 马家山特大桥, 客运专线, 先简支后连续, 预应力梁桥, 道岔梁

Abstract: The construction of simply supported continuous prestressed beam bridge can effectively avoid many problems of cast-in-situ construction, and has obvious advantages in the application of railway bridge. Relying on the Majiashan bridge project of the newly-built Baoji Lanzhou passenger dedicated line, the bridge design and construction scheme of simply supported turnout beam followed by continuous prestress are analyzed. Reasonable calculation parameters and loads are selected in the design. The static analysis and calculation in the construction stage and operation stage are mainly checked, including the strength, crack resistance, stress, and deformation natural vibration characteristics. In the construction stage, the bridge construction technology of simple support before continuous prestress of turnout beam is studied, and the key points of construction technology are analyzed in detail. The results show that the proposed design method and construction control points provide an effective guarantee for the smooth completion of Majiashan bridge. The research results can be applied to the design and construction of turnout beam of passenger dedicated line.

Key words: Majiashan bridge, passenger dedicated line, simply supported-continous, prestressed girder bridge, switch beam