高雄捷運系統地下設施之防蝕措施

Corrosion Prevention against Underground Facilities on Kaohsiung Mass Rapid Transit System

由於捷運系統大多採地下方式興建，在防蝕這個題，地下結構物內混凝土及鋼筋的腐蝕現象尤需注意。又一般捷運系統係採非接地系統之牽引供電方式，部分電流會從軌道洩出，形成雜散電流，亦可能導致地下結構物內鋼筋及接地系統等之腐蝕，而此等金屬材料之防蝕措施便因此變得非常重要。本文乃分別針對混凝土的劣化及鋼筋與接地系統的腐蝕，提出防範建議，期藉由建議之防範方向與措施，達到有效的腐蝕控制。

Most of mass rapid transit systems were built by underground structures. For the study of anti-corrosion, the corrosions of the concrete and steel particularly need to be concentrated inside of underground structures. On the other hand, the mass rapid transit systems usually use the type of non-earth system for the traction power supply but the part of current will be leaked out from the track bed of the railway and then forms stray current. It may also be caused the corrosion of steel and earth system inside of underground structures. Therefore, the performance of anticorrosion is more important in the underground structures. The study is aimed at the recommendations of the anti-corrosion for the concrete, steel and earth system, respectively. It is also hoped that the anti-corrosion approaches could be implemented to effectively control corrosion.