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New railway to the Po Gan Jiangdong Bridge Construction Risk Management Research

Author: GaoZhiShen
Tutor: ZhouZuo；ZhangHongXin
School: Central South University
Course: Project Management
Keywords: dongxin Ganjiang Long-span Bridge project construction duration risk analysis precautionary measures
CLC: U445.1
Type: Master's thesis
Year: 2009
Downloads: 68
Quote: 1
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Abstract

Risks exist all over the large projects, therefore, it is greatly essential to research on the risk management of large projects and to propose precautionary measures.With large-scale investment, relatively long construction cycle and complicated natural environment along, the Dongxin Ganjiang Long-span Bridge is the key controlled project of the Xiangpu Railway; moreover, with the great challenges of complex geological, hydrology and weather environment, there is relatively huge risk for bridge construction, especially most intensified in the risk during the construction.The social and economical environment and the capital construction of the project are introduced in the thesis. Through analysis and comparisons, the hugest risk of the bridge exists in the construction process of deepwater foundation, continuous steel truss and box-girder slide shuttering forms. On the basis of many organizations of construction scheme collections and assessments of laboratory achievements, the thesis identifies and classifies the sources of the bridge construction risks on deepwater foundation, continuous steel truss and box-girder slide shuttering forms. By expert evaluation method, it is considered that the main construction risk of the deepwater foundation is to influence the navigation of Kan River and to cause the damages of ships, persons and pile groups; the main construction risks of continuous steel truss are the acute water and high waves, the difficulties in controlling the size change by welding and in guaranteeing the weld seam; the main construction risks of box-girder slide shuttering are the difficulties in controlling the quality of box-girder concrete pouring, the installation and usage of MSS1500 deck-travelling sliding shuttering forms, and the danger of constructors on the complicated spot and working aloft. And the risks of influencing the project time limit are the slow progress of pile driving that can not finish the plan, the damages and failures of key facilities, the false designe going against the job site which needs redesigning and the poor programming of the project construction.Aiming at the above construction risks, the thesis carries on the risk assessment by investigation and expert evaluation method, analytic hierarchy process and fuzzy comprehensive evaluation method respectively. After assessing the risks of deepwater foundation, continuous steel truss and box-girder slide shuttering forms during construction and the risks of controlling time limit of the project by investigation and expert evaluation method, it is considered that the holistic construction risk of the bridge deepwater foundation is relatively small; the holistic construction risk of continuous steel truss is intermediate and the holistic construction risk of box-girder slide shuttering forms is on the low side, and the risk of time limit of the whole bridge project is comparatively small. The importance degree of each single risk is assessed by analytic hierarchy process; according to the classification of risks, the four-layer AHP construction is established; the importance of factors is analyzed by neighboring comparative method; the constructing judgment matrix computes the relative weight ratio of the compared factors to the norm, and at last the consistency check is done to sequence each factor. According to the computing result, in the project, the construction risk of continuous steel truss is the largest, followed by box-girder slide shuttering forms and deepwater foundation. The holistic risk of the project is analyzed by fuzzy comprehensive evaluation method plus analytic hierarchy process to carry out the first-level fuzzy evaluation and then second-level fuzzy evaluation; on the basis of the second-level fuzzy evaluation and according to maximum membership degree law, the holistic construction risk of the bridge belongs to the level of "rather high".For the above analysis, from the perspectives of the constructors, engineering management and the project construction organization design, precautionary measures against the main risks during the project construction are proposed for proprietors and contractors to better understand and command the potential risks during construction so as to implement risk management effectively and to reduce risk.

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