Table 9.3 Fill Factors for Hydraulic Hoe Buckets Moist loam/sandy clay Sand and gravel Rock-poorly blasted Rock-well blasted Hard, tough clay *Percent of heaped bucket capacity. Reprinted courtesy of Caterpillar, Inc. Material Fill Factor* (%) 100-110 95-110 40-50 60-75 80-90 Table 9.4 Excavation Cycle Times for Hydraulic Crawler Hoes under Average Conditions* Bucket Size (cy) <1 Load Bucket (sec) 5 Swing Loaded (sec) Dump Bucket (sec) Swing Empty (sec) Total Cycle (sec) 4 2 3 14 1−1½ 6 4 2 3 15 2-2½ 6 4 3 4 17 3 7 5 4 4 20 312 7 6 4 5 сл 22 4 5 7 7 6 7 4 5 22 4 *Depth of cut 40 to 60% of maximum digging depth; swing angle 30 to 60 degrees; loading haul units on the same level as the excavator 100 6 24
Table 9.3 Fill Factors for Hydraulic Hoe Buckets Moist loam/sandy clay Sand and gravel Rock-poorly blasted Rock-well blasted Hard, tough clay *Percent of heaped bucket capacity. Reprinted courtesy of Caterpillar, Inc. Material Fill Factor* (%) 100-110 95-110 40-50 60-75 80-90 Table 9.4 Excavation Cycle Times for Hydraulic Crawler Hoes under Average Conditions* Bucket Size (cy) <1 Load Bucket (sec) 5 Swing Loaded (sec) Dump Bucket (sec) Swing Empty (sec) Total Cycle (sec) 4 2 3 14 1−1½ 6 4 2 3 15 2-2½ 6 4 3 4 17 3 7 5 4 4 20 312 7 6 4 5 сл 22 4 5 7 7 6 7 4 5 22 4 *Depth of cut 40 to 60% of maximum digging depth; swing angle 30 to 60 degrees; loading haul units on the same level as the excavator 100 6 24
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Question
What it the best probable production in lcy/hr for a 3 cy hoe excavating poorly blasted rock?
Assume a 50 minute efficiency.
Use data from Tables 9.3 and 9.4 in the book and assume that the average depth of excavation and the angle of swing fall within the range of average conditions.
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