污水管線維修管理工法之評估

興建污水下水道改善居住環境及提高生活品質，為一個國家現代化的重要指標之一。台北市污水下水道興建至今用戶接管普及率已逾66%，但部分管線使用多年，管線已有腐蝕及損壞情形發生，為保持管線暢通及延長使用年限，必需進行維修改善。維修工法分為明挖工法及免開挖工法；免開挖工法又可採行局部修補、區段翻修及管線置換等方式。依據施工可行性及經濟性的比較，免開挖維修工法之反轉工法及旋轉擴大工法，適用於都市污水管線維修。台北市老舊社區，施工現場巷弄多狹隘，因反轉工法設備較大，不易施工；如採用旋轉擴大工法，配合pvc襯片，能提高施工速度，減少品質控制點。本研究利用萬華社區案例，驗證旋轉擴大工法能在短時間內完成管線翻修，並經CCTV檢視證明翻修管線符合需求，適用於都會區道路狹隘之區段管線翻修工法。

關鍵字

明挖法；維修工法；污水管線

並列摘要

Construction of sewer system to improve the environmental and living quality is one of the most important indicators of modern countries. Sewer pipeline has been built for a long time and the penetration rate has reached over 66% today. Partial pipeline has been corroded or damaged and the measure of repair or rehabilitation should be taken to maintain the normal function or to extend the service of pipeline. Open cut or non-open cut construction method can be selected in accordance with the requirement of repair, renovation or replacement. In urban area with heavy traffic, open cut method is hard to exercise due to the shortage of construction space. In order to avoid excavation and to speed up construction, expanding method or in-situ-form method is suggested to adopt for sewage pipeline maintenance based on the previous studies. In this study, the maintenance project of Wanhua District, Taipei City , was used as a case study to demonstrate the effectiveness of expanding, in-situ-transform method in the narrow streets or lanes. PVC instead of PE was selected for the renovation material to avoid the heating procedure. The quality assurance of in-site implementation of pipe renovation was verified and the construction project could be successfully completed within a short time.