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Research on Construction Methods of Cast-in-place Box Arched Bridge’s Sub-layer

Author: QinBao
Tutor: WangZhengMei
School: Wuhan University of Technology
Course: Roads and bridges to cross the river engineering
Keywords: Hingeless arch box section Partial ring segments FEM Model
CLC: U445.4
Type: Master's thesis
Year: 2010
Downloads: 42
Quote: 0
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Abstract

Span arch bridges in recent years, new emerging, for large span arch bridge pouring box section, especially for non-twisted arch statically indeterminate structure, a reasonable choice of ring, segmented method can not only save significant cost, but also to ensure the stability of the bridge and improve construction safety factor. Due to construction of ring segments proportional and sequential arrangement of different construction stages and the entire arch force calculation of the force is also very different. The partial ring, segmented to determine the main structural internal force should be reasonable, construction organizations and arrangements and the use of equipment and construction technology and other aspects to consider. How long span arch partial ring box section, segmented effective construction control, to ensure the safety and into the arch bridge alignment and internal forces to meet the design requirements, without changing the design of the case, how to reduce the arch architecture piece sectional dimension, maintaining the arch in the case of small deflection changes smoothly together and eliminate partial ring tensile stress caused by improper, is the purpose of this study. Based on the large amount of data access and collection of technical staff on the arch of ring segments pouring sequence and methods of research, combined with the actual construction, through a variety of software to calculate the combined method is more suitable for the theoretical analysis of such a kind of bridge friendly construction methods. At the same time, but also through the construction process monitoring data and the theoretical data comparison method in the various aspects of the errors of the construction compared to obtain a better bridge construction for such a method. Through analysis and comparison can be drawn the following conclusions: (1) in a large box section span arch bridge fasting hingeless arch cast construction, the use of segmented ring with a combination of pouring manner more conducive to project force structure, and project cost savings, in a similar span bridge, using 2.5m better overall cast segments. (2) partial ring, segmented construction site should be based on the ratio of the actual situation, considering the time, cost, safety and overall construction layout and other factors combine to determine the model calculations. (3) in the arch of concrete pouring process should be combined with the actual situation and constantly improve the construction measures, as far as possible uniform concrete quality, arching force uniform, various parts of the stress be effectively controlled, as necessary, develop their own toppings system, to take increase templates, adjust the concrete mix and other measures. (4) mounting arch arch and Templates gantry control should be considered non-elastic deformation and elastic deformation, with permanent loads, temperature changes, shrinkage and creep of concrete under the action of the displacement values. (5) minutes between the rings after the ring of concrete creep effects can be increased by reducing construction time as well as to reduce the stirrups. (6) negative moment at the arch of the foot arch should be consolidation or other effective means to eliminate. In this study, SAP2000, Midas, Abaqus three kinds of software to build a simulation model construction data obtained during the construction of the key processes to guide, and by actual measurement data reverse guiding various models, in advance on the basis of common right arch, arch of the force, deformation, stability analysis. While using some optimization means pouring arch to arrive at optimized box-section arch sub-loop proportional, segmented pouring sequence for the class design and construction of the bridge to provide a reference.

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