英文篇名
Current Defects of Existing Ground Anchors in Taiwan
作者
何樹根、高秋振、戴源昱、 陳佩玉
關鍵字
地錨、揚起試驗、自由段鋼腱、錨碇段鋼腱、鋼絞線
摘要
在台灣因曾經發生多次地錨失敗並造成重大傷亡的事故,致使地錨的使用成為具爭議性的話題,反對其使用於永久構造的聲音相當大,但在工程上地錨是提供擋土牆或邊坡穩定之阻抗(強度)最有效率的工法之一,且在重型機具無法進入的陡坡,地錨工法有時會成為唯一的選項,因而如何使地錨成為可靠的工法是工程界必須面對的問題。本文整理既有地錨邊坡在調查、設計、施工及維護各方面曾經出現的問題,供檢討改善的參考。其中對永久性地錨而言,最重要的是包括錨頭、自由段鋼腱及錨碇段鋼腱的長期防蝕的問題;而管理維護的制度的建立亦為當務之急,因為地錨邊坡之破壞通常是長期累積而來,若有管理維護的制度,可在破壞之前發現徵兆並加以改善,確保地錨之長期功效。
英文摘要
Using ground anchors has become a controversial issue after the failures of several slopes, which have caused significant casualties, in Taiwan. A great part of engineers are against anchors to be used in permanent structures. However, ground anchors offering high resistance are one of the most efficient methods to stabilize a retaining wall or a slope. Sometimes ground anchors will be the only option in a very steep slope which can not be easily accessed with heavy machinery. Thus, to improve ground anchors to be a reliable construction method is still the present issue for engineers. This paper focuses on the defects of existing ground anchors in the aspects of investigation, design, construction and maintenance for the reference of the improvement of ground anchors. For permaent anchors, the most important issuse is the longterm corrosion protection of the anchor head, the free length of tendon and the fix length of tendon. In the same time, the maintenance management is also very important. Under regular maintenance, most defets will be found and be remedied when they just happened.