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305chap12 - Chapter 12 Equipment Productivity Productivity...

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Chapter 12 Equipment Productivity
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Productivity Concepts Rate of production Repetitive or cyclic operations Cycle - Sequence of tasks which is repeated to produce a unit of output - Cyclic Capacity - Cyclic Speed or rate
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Hauler/Truck Capacity Heaped Struck
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Construction Materials (Soils) change volumes with handling Volumes - Bank volume in situ volume - Loose volume - Compacted volume Swell Shrinkage
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Figure 12.1 (p. 186) Volume relationships.
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Table 12.1 (p. 187) Approximate Material Characteristics
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Cycle Time and Power Requirements For heavy equipment cycle time is related to power of available equipment. Power required is related to rolling resistance between wheels and road surface Rolling Resistance= 40lb/ton + 30lb/ton for each inch of tire penetration Grade Resistance=%grade x 20lb/ton/ %grade x weight on wheels
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Table 12.2 (p. 188) Typical Rolling Resistance Factors (Caterpillar Tractor Co.)
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Figure 12.2 (p. 188) Factors influencing rolling resistance.
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Figure 12.3 (p. 189) Grade resistance: (a) negative (resisting) force and (b) positive (aiding) force.
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Figure 12.4 (p. 189) Typical haul road profile.
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Table 12.3 (p. 190) Calculations for Haul Road Sections
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