| The structure of concrete cable-stayed bridge without backstays is novel and unique，itbreaks the traditional design concepts straight tower cable-stayed bridge. It has beautifulappearance，no backstays enriched the harmonious relationship between the bridge structureand landscape. Using the dead load of the inclined tower to balance the bridge s dead loadand live load，because of its no backstays and leaning tower，the construction of this kind ofbridge is difficult，especially the main tower construction safety control and linear control isthe key point. The number of cable-stayed bridge without backstays built in the world is less.In this paper，the author analysis the cable-stayed bridge without backstays, introduces thecable-stayed bridge construction control point，influencing factors and construction controlmethods. According to the background of concrete cable-stayed bridge without backstays，using the special bridge finite element analysis software Midas civil2012(V8.0.5) calculatethe construction control analysis model， combined with the structure characteristics of theLeaning Tower of cable-stayed bridge without backstays, make full use of cable force in themain tower construction process of concrete, the construction scheme of concrete tower isoptimized, concrete tower of the slipform construction instead of supporting construction, andthe safety checking. The leaning tower of cable-stayed bridge without backstays, a generalformula in the construction stage, the leaning tower segment mould position of each directionof the pre deviation, and the temperature effect on the main tower of the cantileverconstruction in construction stage analysis, considering the influence of temperature variationof each construction segment pre deflection of main tower cantilever, correction given theannual temperature change of the main tower pre deflection value and the alignment of thebridge under different temperature. According to the real-time monitoring of the main tower,the main beam alignment and stress and cable force, through the comparative analysis of thetest data and theoretical data, the stress of the main girder, girder, the main tower stress, linear,main tower of cable force are close to the theoretical design level, in fact, optimization ofconstruction scheme of the the proposed is feasible. |
