부산대학교 도서관

Taiwan's infrastructure has developed over the past century, with many bridges exceeding 40 years of service. Numerous bridges require renovation, while the demand for new bridge construction continues to rise alongside urban development. Steel structures take advantages in terms of rapid construction, leading to the replacement of traditional concrete bridges with steel bridges in renovation and new construction projects. However, despite the advancement of steel bridges, corresponding construction methods have not been widely adopted, often resulting in using conventional falsework methods that negate the advantages of steel structure construction, such as speed and minimal traffic disruption. While Taiwan has numerous bridges constructed using steel structures, research on construction methods for steel bridge decks remains limited. This study focuses on the Da-zhu Bridge, a steel cable-stayed bridge involved in the Taoyuan Roadway No.19 Widening Project, aiming to compare and confirm the superiority of the full-deck incremental launching method over the scaffolding method for the bridge deck erection of steel cable-stayed bridges. This thesis reviews past construction methods for bridges in Taiwan, organizes construction methods and selection criteria for steel bridges, and collects domestic and international bridge construction case studies, including cases where foreign steel bridges adopted launching methods. In-depth interviews are conducted with team members who first-ever applied the launching method for the upper structure construction of steel cable-stayed bridges in Taiwan and implemented the Taoyuan Roadway No.19 Widening Project. These interviews facilitate a case study and expert interviews regarding the reasons for selecting the launching method over the scaffolding method for the bridge deck erection of the Da-zhu Bridge. The study analyzes the constructability of both methods. First, based on the construction process in the design drawings and existing literature, supplemented by expert interviews, the construction processes for the scaffolding method and the incremental launching method are proposed. The applicability issues of the scaffolding method are analyzed, and the overall construction advantages of the launching method compared to the scaffolding method are examined. Preliminary findings confirm that the launching method meets the requirements of not occupying the national highway and significantly reducing traffic disruption, making it a suitable alternative to the traditional scaffolding method for the Da-zhu Bridge erection. After confirming the launching method as the target method, the design and implementation of the launching method are introduced, followed by a problem analysis of the actual construction process using the full-deck incremental launching in the case of the Da-zhu Bridge. Subsequently, various construction factors, such as item differences, construction duration, cost, and external effects, are analyzed for both methods. Finally, the key factors for successful implementation and the overall benefits of the launching method are summarized. This thesis introduces the construction method employed for the upper structure of steel cable-stayed bridges and conducts a case study on the implementation of the launching method. It analyzes and compares the constructability of the traditional scaffolding method and the launching method, then determines the key factors for successful implementation and the overall benefits of using the launching method for the upper structure construction of steel bridges. The findings can serve as a reference for selecting the launching method in future steel bridge construction projects.