Suspension bridge constructed across deep gorge in karst,Papua New Guinea

摘要

The world's highest suspension bridge has been constructed across a 500 m deep canyonin karst at a remote location in Papua New Guinea to carry oil pipelines across the Hegigio River. Thebridge has a main suspension cable and two wind cables, each cable requiring anchorage into cavernouslimestone. For the south abutment located on a pre-existing cut and fill bench, an A-frame tower waserected on pad footings. but with the most critical issues surrounding an 11 storey temporary erectiontower at the cliff edge. On the higher north abutment, the main cable required only a simple supportstructure, but the wind cable anchorages had to be constructed from a bench cut into the cliff face. Siteinvestigation and work was particularly challenging, not only for the usual issues of karst but also becauseof the remote location and extreme topography, and for the control of risk during construction.