Proceedings of the 30th Annual Conference on Deep Foundations, 2005, Chicago, Illinois, USA, (DFI)
Tower Leg Foundation Assessments with Frequency Response and Impedance Profiling Techniques
Power companies are always looking to increase the carrying capacity of existing transmission lines, and the preferred method is to string heavier capacity conductor lines. However this results in higher wind loading and the potential for towers overturning, if the existing foundations do not have the tensile capacity. On older lines, there is often a lock of information can differ considerably from design drawings, due to unforeseen ground conditions along the line route, and no record of the resulting change in design being made. Following successful trials in New Zealand, integrity testing with Frequency Response and impedance profiling techniques is now being used in the region to check concrete foundation properties in-situ and are enabling power companies to get the most out of their assets.
|article #1281; publication #72 (AM-2005)|