Use of Automated Machine Guidance within the Transportation Industry (2018) / Chapter Skim
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Pages 81-94
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From page 81... ...
NCHRP Project 10-77 81 CHAPTER 8: IMPACT OF AMG ON EARTHWORK QUANTITIES BACKGROUND Proper use of digital information for AMG will likely result in less confusion and more accuracy than traditional methods of earthwork pay item quantification and payment. Earthwork pay quantification from AMG must include mechanisms that all parties to the contract (both the agency-owner and the contractor)
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NCHRP Project 10-77 82 No Ye s ( Qu an titi es )
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NCHRP Project 10-77 83 Productivity Gain Using AMG (%) 10 20 30 40 50 Fr eq ue nc y 0 2 4 6 8 10 12 Contractors Vendors Cost Savings Using AMG (%)
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NCHRP Project 10-77 84 Aðalsteinsson (2008) reported results from a field demonstration project conducted using a CAT 330DL excavator to excavate a trench with 1650 cubic yards of sandy gravel material.
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NCHRP Project 10-77 85 Galbraith (2009) reported cost savings of about $10,000 per production mile on a stringless PCC paving project in North Carolina, where Gomaco PS2600 spreaders, controlled by RTK GPS, and a Gomaco GHP 2800 slip form paver, controlled by robotic prisms, were used.
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NCHRP Project 10-77 86 Survey crew cost can be estimated using equation 8-5. HourlyCostPT($)
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NCHRP Project 10-77 87 reduction. The trends in these estimations indicate that the contribution of the material overage reduction factor is significant, while the productivity gain is somewhat significant to the overall cost savings.
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NCHRP Project 10-77 88 • Kriging • Local polynomial • Minimum curvature • Nearest neighbor • TIN Inverse distance to power is a multivariate, weighted average interpolation method (Davis, 1986)
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NCHRP Project 10-77 89 X (m)
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NCHRP Project 10-77 90 Figure 8-6. DTMs of a 540m2 Area using 78 Elevation Data Points using Different Interpolation Methods: (a)
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NCHRP Project 10-77 91 Figure 8-8. DTMs of a 540m2 Area using 11 Elevation Data Points using Different Interpolation Methods: (a)
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NCHRP Project 10-77 92 Table 8-3. Absolute Mean Error of Estimated Elevation Data by Comparing Kriged DTM with 79 points with Different Interpolation Methods Estimated Elevation Absolute Mean Error (m)
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NCHRP Project 10-77 93 section intervals decrease, the computations become theoretically the same. The differences are observed to be as great as 5% when 100 ft cross-section intervals are used with the average-end-area method.
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From page 94... ...
NCHRP Project 10-77 94 design models but are for AMG. • Most of the equipment vendors indicated potential productivity gain of about 40% and potential cost savings of about 25 to 40% using AMG.
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