自重式沉箱與壓入式鋼製沉箱應用於臺中龍井區污水下水道

Self-weighted caissons and press-in steel caissons are used in sewage sewers in Longjing District, Taichung

隨著污水下水道工程的推動，工作井開挖工法的選擇對施工安全、工期與品質產生關鍵影響。為探討不同工法在實務上的適用性與成效，本研究採用個案研究法，針對污水下水道工程中常見的兩種工作井施作工法：自重式沉箱與壓入式鋼製沉箱，進行比較分析。研究以臺中市龍井區之實際工程案例為對象，從沉箱施工進度、地質條件與施工安全性等面向，深入探討施工過程中所遭遇之問題與差異，並彙整分析影響沉箱工程效能的主要因素，進而歸納壓入式鋼製沉箱工法所具備之優勢。
目前壓入式鋼製沉箱工法因專業壓入設備及高技術涵量使得施工費用較為昂貴，實際案例探較少；綜合實務案例、施工數據及文獻資料，本研究系統性地分析沉箱施作過程中之技術挑戰，並提出具操作性的工法選擇建議，不僅補充現有學術研究之不足，更具實務應用價值，能作為類似工程規劃與執行的重要參考依據。

With the ongoing development of sewerage infrastructure projects, the selection of shaft excavation methods plays a critical role in ensuring construction safety, project timelines, and overall quality. This study adopts a case study approach to compare two commonly used shaft construction methods in sewerage projects: the gravity-type caisson method and the hydraulic jacking steel caisson method. Using a real-world case from Longjing District in Taichung City, the research explores differences and challenges encountered during construction from the perspectives of progress, geological conditions, and safety. The key factors affecting the performance of caisson construction are analyzed, with particular emphasis on the advantages offered by the hydraulic jacking method.
Although the hydraulic jacking steel caisson method involves higher costs due to the need for specialized equipment and advanced technical expertise, actual project applications remain limited. By integrating practical case data, construction records, and relevant literature, this study systematically examines the technical challenges associated with caisson construction. Practical recommendations for method selection are proposed, aiming to fill gaps in existing academic research while providing valuable reference for planning and execution of similar engineering projects.