隨著都市發展，管線地下化已成為地下工程發展趨勢。然而如何 在日漸繁雜的工程環境中設立新的地下管路將面臨更高難度的挑戰， 特殊潛盾工法之使用勢必會更加頻繁。本文針對台電潛盾隧道地中接 合案例作為探討，發現工程災害主因為潛盾機地中接合用之止水軸封 破壞，導致漏水，引發管湧現象，而造成沉陷。又因自來水管及汙水 管在未受地盤改良等之保護情況下斷裂，造成災情擴大，形成嚴重沉 陷。為避免災害持續擴大，工程單位採取緊急應變措施，以控制災害。 建議未來在潛盾機設計方面應加強檢討是否符合現地之需求，在作業 前也應檢查機件是否功能正常；而在未來都市計畫方面建議設置共同 管道，保護維生管線，避免二次災害的發生。本研究利用此案例經驗， 提供往後國內施工之參考，以減少工程之風隩與降低工程之成本。;The pipeline underground is the trend of underground engineering with the city development. To set up a new underground pipeline in the complex engineering environment will face more difficult challenges, and some special shield methods will be used more frequently. This research discussed the cause study of underground connection of shield tunnels performer by Taiwan Power Company. It is found that the main disaster was caused by the damage of sealing ring in the shield machine and this damage caused leakage and piping, and then caused the serious settlement of ground surface finally. Furthermore, the ground improvement was not implemented to protect the water pipe and sewage pipe above the tunnel. Therefore, the water pipe and sewage pipe were broken and caused the disaster more serious. To avoid the disaster expansion, the construction department took some urgent measures to control the disaster. In the future, it is suggested that the design of shield machine must consider the ground conditions, and the function of shield machine should be checked before construction. Furthermore, it is suggested to set up some common ducts in urban planning for protecting lifeline and preventing of repeated disasters. This experiment is valuable for giving us some suggestions to the future constructions to reduce the risk and cost.
