Research On Several Questions In Construction Control Of Continuous Beam Bridge In Shanghai-Hangzhou High-speed Railway

The bridge design process, in theory, the reality of the construction site for the environment and the values of relevant parameters can not be done accurately. To make the construction process of the real state of the various conditions the maximum extent consistent with theoretical design and construction process to ensure that all critical control sections to meet the theoretical structure of stress state and stability of the overall security, we need to bridge the entire process of construction process Construction Control.In this paper, cross-Hangzhou Expressway, Shanghai-Hangzhou-off special show bridge span continuous beam construction control state Tong instance, first introduced the current overview of the development of high-speed railway, construction control for continuous bridge the need for high-speed railway construction and construction control principles and methods of controlling the results of the relevant factors and error adjustment method.Build simulation models using Midas and the results obtained, the construction control of specific practical problems in the study, including the 42m pier continuous beam construction in the block zero degree of control and temperature around the crack and stress monitoring, zero blocks problems encountered in the construction, the cantilever section of the construction and close control, and ultimately obtained full-bridge construction of the temperature, stress, and linear control results. Control in the construction process, we must field data and field test results on the model parameters repeated correction, on-site construction control survey work is the basis of the actual construction site to obtain the key parameter is the model, only in a serious and responsible attitude, ground measurements, ground calculation, diligence analysis, ground thinking to manipulation in the construction of the bridge structure, close to the actual state of constant theoretical ideal, the successful completion of construction control.Zero block in the large volume construction process, it should block the construction phase of the zero temperature crack control given high priority to improve the monitoring frequency, a careful analysis of the results of the monitoring data to prevent the concrete temperature cracks. Zero blocks while curing process, we should pay special attention to the larger temperature changes in the environment situation, do a good job of concrete girder insulation measures to prevent excessive temperature difference between inside and outside of concrete due to cracking phenomenon caused. Cantilever construction process is the most critical engineering equipment construction Cradle. During the construction process, because the duration and site constraints, the construction of ballast hanging basket did not meet the requirements of time and sometimes the length of time, resulting in Basket does not completely eliminate the non-elastic deformation, but also elastic deformation caused by the Cradle The results of the imprecise, resulting in cantilever section of the calculation of camber bias. Preload in the Cradle, the pilot program must be strictly in accordance with the pre-pressure, complete elimination of the non-elastic deformation of the bridge to more precise control of the whole line.Finally, in a programmatic summary of this work, the proposed direction of this research still needs some further research to explore.