Estimating and Contracting Rock Slope Scaling Adjacent to Highways (2020) / Chapter Skim
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4 Tens of thousands of rock slopes are adjacent to the nation's highway systems as part of the transportation network. Together with many additional features, this highway network permits commerce, facilitates mobility, and contributes to national goals, as stated in FHWA's mission statement, to "enable and empower the strengthening of a world-class highway system that promotes safety, mobility, and economic growth, while enhancing the quality of life of all Americans." However, antiquated construction goals and methods often prioritized minimal excavation quantity and speed of construction over long-term slope stability, leaving states nationwide with legacies of marginally performing rock slopes.
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Introduction 5 Synthesis Objectives Frequently, scaling of loose rock from the rock cuts is one of the first activities in both preventive maintenance programs and rockfall hazard mitigation projects (Andrew and Pierson, 2012; Pierson and Vierling, 2012)
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Figure 1. Hand scaling via rope access and with scaling bars.
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Introduction 7 Mechanical Scaling. Scaling performed using heavy equipment such as mobile walking excavators (commonly referred to as "spider excavators")
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8 Estimating and Contracting Rock Slope Scaling Adjacent to Highways Safety Scaling. Scaling requested by the scaling contractor that lies outside the contract plans and specifications.
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