CASE STUDY -APPLICATION OF HIGH STRENGTH POST-TENSIONED RODS FOR ANCHORING AERIAL TRAM STRUCTURES TO ROCK

摘要

Forces generated by large aerial trams with rigid track cable end anchorage can be significant at locations where the cables anchor to the concrete. These forces are typically accounted for by providing mass concrete foundations or reinforced concrete mats and rock anchors. This paper presents a case study of an 80 person aerial tram located at Stone Mountain, Georgia, USA. This tram's reinforced concrete bollards used high strength post-tensioned rock anchors to anchor the bollards. This system minimized the amount of concrete transported to the top of the mountain and the impact to the environmentally sensitive mountaintop area Addressed is a description of the post-tensioned rock anchor/concrete bollard design philosophy and system behavior. Focus is made on strength of rock, high strength rod and rock anchor grout characteristics, reinforcement details for localized concrete post-tensioning stresses, the post-tensioning operation, and an overview of admixtures used in the long distance concrete pump mix design.