台灣地區鋼板（管）樁碼頭腐蝕現況調查研究

Field Investigation on Corrosion of Wharf Steel Sheet/Pipe Piles in Taiwan

為確保碼頭營運安全及延長港灣構造物使用年限，本文特以花蓮、基隆、蘇澳及台中港鋼板（管）樁碼頭現況做為探討，藉由腐蝕現況之調查結果，提供港務局未來之防蝕設計及維護參考。調查結果顯示，花蓮港5號、6號碼頭雖未安裝防蝕保護措施，但鋼板樁腐蝕速率小於0.1 mm/yr，遠小於設計允許值，然而因使用年限均已超過30年，且部份鋼板樁厚度減少量大於3.0 mm，接近原設計允許值，值得注意。基隆、蘇澳及台中港之鋼板（管）樁有安裝陰極防蝕保護措施，防蝕效果良好，未有明顯銹蝕現象。

To assure operation safety and extending service life of port facilities, sheet/pipe piles of wharf at Hwa-Liang, Kee-Lung, Su-Ao and Tai-Chung ports were surveyed. The results of field investigations are analyzed and will provide a reference to port authority for corrosion prevention and maintenance strategy in the near future. Results indicated that corrosion rate of steel piles without corrosion prevention at No.5 & 6 wharfs in Hwa-Liang port is less than 0.1 mm/yr (far less than designed criteria value). However, Hwa-Liang port has been constructed over 30 years, parts of steel sheet-piles thickness are reduced over 3.0 mm and almost reach to the maximum allowable deduction value. It would make piles structures deficient in force-bearing. As to Kee-Lung, Su-Ao and Tai-Chung ports, Steel piles with cathodic protection are well prevented from corrosion; and wharfs are in good situations.