| Summary: | 碩士 === 國立高雄第一科技大學 === 營建工程所 === 95 === Construction of mass rapid transit (MRT) systems has evolved from traditional construction contracts in the past into design/build (D/B) contracts, which can reduce interface problems and increase integration efficiency but bring more performance and management responsibilities to contractors. An enlarged scope of contract will involve more uncertainties and greater risk. Therefore, contractors in bid preparation need to perform risk assessments concerning project requirements, partner selection, finance, and construction methods, in order to manage risks properly during project execution so that losses and delays as a result of changes and rework are minimized. Although many researches have studied risk management in construction, few were directed towards risk management relating to construction of elevated MRT projects, which have the advantages of lower cost and shorter time as compared with tunneling projects and hence are effective in solving urban congestion problems. Since MRT construction involves various categories of work, structural, architectural, mechanical, electrical, and environmental, with a very high level of complexities, the resulting high risks may be lowered if proper measures are taken in advance.
Through a study of the literature and project reports, this research has collected problems faced in construction of Taipei MRT and Kaohsiung MRT, and produced a summary of twenty risk factors. To rank the risk factors in their relative impacts, a questionnaire of professionals representing the clients, consultants, and contractors for the Neihu line of Taipei MRT and the red line of Kaohsiung MRT was carried out. The responses are analyzed overall as well as by groups of respondents. The results show that top ranked factors are mainly related to contractual risks, such as delays in approval of design drawings by various authorities, large-scale work with complex interfaces, changes of design initiated by the client, delays caused by land acquisition and demolition problems, disputes due to different interpretations of contract clauses, and delays in progress payment due to stringent contract terms, indicating contract- related factors have the widest and greatest impact. Differences in responses between professional groups were found insignificant, whereas significant differences exist between participants of Taipei MRT and Kaohsiung MRT with respect to delays in drainage work caused by restrictions in monsoon seasons, unmarked pipelines in narrow streets, and delays in progress payment.
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