Study On Mechanics Effect Of Cable Layout On Concrete Arch Bridge With Cantilever Cast Method

A large number of long-span reinforced concrete arch bridges were built by cable hoisting system and stiff skeleton method in China. However, most of concrete arch bridges in aboard were constructed by the cantilever construction method. With the advantages of the cantilever method for arch bridge construction in the mountains, the theoretical research and engineering practice on the cantilever pouring construction of reinforced concrete arch bridge have been performed, there are two long-span reinforced concrete arch bridge has been built separately in Sichuan province and Guizhou province.During cantilever casting construction, cable arrangement of the anchor system directly affect the strength and force, the main arch ring clasp anchor cable arch ring of linear control, but the current lack of research on this aspect of the system. In this Dissertation, the guizhou province transportation hall of science and technology project "hanging basket suspended pouring reinforced concrete box arch bridge design and construction of key technology research" as the backing, peng super-large bridge as the research object, with wood button around anchor system to carry out the following research:① collecting and using the cantilever construction of reinforced concrete arch bridge anchor system construction, will buckle anchor arrangement due to fan-shaped arrangement and star type decorates two kinds of forms.② according to the concrete arch bridge in cantilever construction process of stress and deformation characteristics, the analysis and comparison, on the basis of domestic construction control methods, gives the buckle with stress balance method to calculate the algorithm and the calculation procedure of anchor cable force.③ the star type and fan-shaped two buckle anchor cable arrangement, respectively formulate the wood peng super-large bridge with the largest cantilever end for 17 °, 15 °,23 ° 20 °, bousso scheme, to carry out the construction phase of the main arch ring cross section stress and deformation analysis research.④ the results show that the arch foot section of the cable, cable shoulds not be too great dip Angle, to ensure that the section of concrete will produce a compressional stress in the arch ring cross section; For other cable layout, combined with the stress of the arch ring cross section and the analysis of the linear control, the fan cable is decorated in the longest cable level Angle of 20 ° is relatively reasonable, the star type cable is decorated in the longest cable of a reasonable level 17 ° Angle.