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Thin -section arch openings swivel construction is a new construction technology, swivel technical difficulty, construction risk and bridge span and semi- span rotating weight system has significant relationships , in addition to careful design, construction , the rational comprehensive monitoring and control system is an important guarantee for the smooth implementation of twist . Meanwhile analysis of such processes swivel construction technology research to better promote the development and improvement. In this paper, Huajiang bridge engineering background , based on construction monitoring critical stage of calculation and analysis and judgment , according to the calculation results of the analysis guide the construction site monitoring, through on-site monitoring, provides a number of effective and accurate data for the same type of bridge construction control provide a favorable reference. The main contents are as follows: ( 1 ) open thin-walled sections under construction characteristics described arch bridge construction process , combined with engineering examples of the bridge monitoring is important and difficult content analyzed. ( 2 ) According to swing bridges, design principles, the focus of this paper structure calculations of the \center of gravity and the center of rotation system basic adjustment in place. ( 3 ) the use of MIDAS and ANSYS were static analysis of the bridge and stability analysis . Twist off the shelf stage tensioned structure analyzes cable force calculation method , and get their cable force value ; well arch , the back wall of the force , deformation , the main factors and the local stress on the turntable were analyzed and studied the dynamic effects of stress on the characteristics of the arch and arch off the shelf stability of phases for the site construction provides a favorable theoretical guidance . ( 4 ) under the guidance of the theoretical calculations , cable tension and condition of each arch , a key section of the back wall, and other stress , linear focused monitoring , the measured data analysis showed that the swivel process smooth , measured , theoretical linear deviation is small, critical section stress distribution is reasonable , and thus show that the river bridge on the flower used in monitoring method is reasonable and scientific.
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