Research Of Key Construction Techniques For Integral Hoisting Concrete Filled Steel Tied Arch Bridge

Concrete filled steel tied (CFST) arch bridges were widely used in our roads and bridgesbecause of good structure force characteristics and aesthetic values. A new method-cranelifting of construction steel arch ribs and tie beam stiff skeleton when the concrete filled steeltied arch bridges across either high-grade or high-grade road course. The key technologies asa whole including reasonable method to determine the status of construction, hanging pointselection and construction program development. In this paper research the key technologiesof crane lifting of concrete filled steel tied arch bridge around the following aspects:(1) Based on the construction technology of CFST tied arch bridge summarized,analyzed the present situation of the country as a whole CFST tied arch bridge liftingtechnology, a clear crane lifting construction technology critical issues, purpose and meaning.(2) According to the theory of CFST tied arch bridge, determine a reasonableconstruction of the basic principles of the state were analyzed and the main method isreasonable and rational construction of a bridge state status; layout based on a reasonableassessment criteria lifting point Comparative analysis of the differences and the applicableconditions for each of the criteria.(3) Reasonable steps to determine the status of the bridge, based on a study of the bridgeto determine a reasonable state of the basic algorithm is proposed rib stress control conditionand moment feasible region; reasonable to bridge the state as the goal, the use of forwarditeration with impact matrix method of combining to form a rational calculation of tensileforce of the boom.(4) With an engineering example, a bridge based on reasonable state and theoreticalcalculations reasonable construction state, through the establishment of the finite elementmodel to calculate the reasonable bridge status, and to determine the appropriate camberboom rib tension and through and design values are compared to verify the reasonablenessboom force calculation method proposed in this paper the feasibility and correctness.(5) Through tied arch bridge concrete pipe force transmission path and the mechanicalcharacteristics of the analysis of the impact of the lifting process clearly different point ofhanging rib mechanical properties is proposed to determine the principles hanging position. By lifting the whole project examples and stiff skeleton steel pipe arch select a number ofdifferent positions trial hanging points, and the results were analyzed to determine thereasonable point in hanging relying project has been verified; proposed construction programformulating principles, combined with the actual construction site and constructionequipment, local conditions formulated lifting program.