The selection of construction method for concrete segmental bridge in Thailand : a case study of MRT purple line (contract 2)

Abstract

Over the past decade, bridge design and construction technology has undergone rapid development. Although knowledge and technology in the field of bridge design has been studied and transferred to engineers, specialist engineers and specialists in advanced construction techniques are still required to make decisions. However, within the decision-making process, experts still face difficulties and complexities in selecting the suitable method of bridge deck construction. In this study, the Analytical Hierarchy Process (AHP) was applied in consideration of the factors, and is used for selecting the suitable method of bridge deck construction and erection equipment system. The MRT Purple Line (contracts 2) construction project was used as a case study. The results of this research reveal there are six main factors influencing the selection of bridge deck construction method, namely size of project, construction site condition, cost, time, health and safety, and environmental impact. Following the application of these factors to select the five types of superstructure and 12 types of erection equipment in the case study, the results show that the most suitable superstructure is the Span-by-Span method and the most suitable erection equipment is the Under Slung Gantry.