4. A crawler hoe having a 2 ½ -cy bucket and whose cost per hour, including the wages to an operator, is $67, will excavate and load haul units under each of the stated conditions. The maximum digging depth of the machine is 20 ft. Determine the cost per bank cubic yard for each condition. (Condition 1. 300 bcy/hr, $0.223/bcy; Condition 2.319 bcy/hr, $0.210/bcy; Condition 3. 128 bcy/hr, $0.523/bcy) Condition (1) (2) (3) Material Moist loam, earth Sand and gravel Rock, well blasted Depth of excavation (ft) 12 16 14 Angle of swing (degrees) 60 80 120 Percent swell 14 Efficiency factor (min-hr) 45 50 45

Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN:9781337705028
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter18: Sheet-pile Walls
Section: Chapter Questions
Problem 18.6P
Question
4. A crawler hoe having a 2 ½ -cy bucket and whose cost per hour, including the wages to
an operator, is $67, will excavate and load haul units under each of the stated conditions.
The maximum digging depth of the machine is 20 ft. Determine the cost per bank cubic
yard for each condition. (Condition 1. 300 bcy/hr, $0.223/bcy; Condition 2.319 bcy/hr,
$0.210/bcy; Condition 3. 128 bcy/hr, $0.523/bcy)
Condition
(1)
(2)
(3)
Material
Moist loam, earth
Sand and gravel Rock, well blasted
Depth of excavation (ft)
12
16
14
Angle of swing (degrees)
60
80
120
Percent swell
14
Efficiency factor (min-hr) 45
50
45
Transcribed Image Text:4. A crawler hoe having a 2 ½ -cy bucket and whose cost per hour, including the wages to an operator, is $67, will excavate and load haul units under each of the stated conditions. The maximum digging depth of the machine is 20 ft. Determine the cost per bank cubic yard for each condition. (Condition 1. 300 bcy/hr, $0.223/bcy; Condition 2.319 bcy/hr, $0.210/bcy; Condition 3. 128 bcy/hr, $0.523/bcy) Condition (1) (2) (3) Material Moist loam, earth Sand and gravel Rock, well blasted Depth of excavation (ft) 12 16 14 Angle of swing (degrees) 60 80 120 Percent swell 14 Efficiency factor (min-hr) 45 50 45
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