强风化岩扩底锚桩基础在220 kV 新港输电工程中的应用

2008 年10-12 月，在220 kV新港输电工程中，对位于烟台开发区九目山顶的38 号、39 号、40 号直线塔进行了全方位高低腿的扩底锚桩基础施工，与板式基础相比降低造价58.8%。试验单锚桩由6.8 级螺栓（材质40Cr）的锚杆、C30 型混凝土构成，单锚桩底部为扩大端；根据带锚板的热镀锌锚杆和未镀锌锚杆的2 组对比试验数据分析可知，带锚板的热镀锌锚杆可以作为基础锚杆，解决了锚杆的混凝土保护层不够的问题。经力学分析，基础锚杆选用高强钢8.8 级螺栓，直锚4 桩结构可改为直锚双桩结构，从而进一步降低造价40%左右。

Application of the Enlarged Base Anchor Pile in the 220 kV Xingang Power Transmission Project

The enlarged base anchor pile foundation was adopted for the NO.38,39 and 40 suspension towers of the 220 kV Xingang power transmission project,as a result reducing the cost by 58.8% compared with the slab-foundation.The experimental single anchor pile consisted of 6.8-class bolts(material quality 40Cr) and C30 concrete with an expanded base,According to a comparison of the testing data of the hot-galvanized anchor rod and the no-galvanized anchor rod,the galvanized anchor rod with an anchoring plate can be...