Research On Construction Stability Of Combination Construction Method Of Stiff Skeleton With Cantilever Casting Of Long-span RC Arch Bridge

Domestic long-span reinforced concrete arch bridge construction commonly used cable hoisting method, Lifting capacity requirements to meet, had to reduce the lifting arch segments, thereby greatly reducing the arch integrity, prone to cracks during the post-operation. Cantilever casting method is often used abroad, For larger span arch bridge, To reduce the amount tower and buckle anchor steel and cantilever casting construction risk, To reduce the amount of steel towers and anchor and pouring arch cantilever construction risk, so develop the use of cantilever casting method and stiff skeleton combination method, hereinafter referred to as the combination method. To enrich our concrete arch bridge construction methods, and promote the development of the cause of the concrete arch bridge, it is necessary to study and learn from foreign construction method. That contains extensive research, and stability is the basic guarantee of safety throughout the construction process,so this paper as that a starting point, Research the stability of combination method, give the dual nonlinear geometric calculations to consider the material and compare different stability calculations construction program, Finally, the construction phase stability of parametric analysis is reasearched. Specific work was carried out as follows:①Explore the establishment of the model,that arch combination method suitable for the construction of plate-beam. And portfolio construction method is divided into: the cantilever pouring stage, installation stiff skeleton stage, pouring concrete stage of outsourcing.②Study the geometric and material non-linear effects on the stability of the double degree of safety factor.③Comparative segment enhance the stability of the overall fight suspended construction of two stiff skeleton program.④Proposed four concrete pouring outsourcing solutions were calculated safety factor of stability, and a comparative evaluation.⑤Further arch concrete strength, the main chord, linking the upper and lower flat, horizontal flat joint stiffness parameter stability analysis to analyze the various design parameters on the size of the construction phase stabilizing influence.