11.2 A crawler hoe with a 3-cy bucket and a cost per hour, including the wages to an operator, of $86 will excavate and load haul units under each of the stated conditions. The maximum digging depth of the machine is 25 ft. Determine the cost per bank cubic yard for each of the stated conditions. Condition Material Depth of excavation (ft) Angle of swing (degrees) Percent swell Efficiency factor (min-hr) (1) Sandy clay 10 60 20 45 (2) Hard clay 18 90 50 (3) Rock, well blasted 15 90 50 (4) Sand and gravel 20 150 13 55

11.2 A crawler hoe with a 3-cy bucket and a cost per hour, including the wages to an operator, of $86 will excavate and load haul units under each of the stated conditions. The maximum digging depth of the machine is 25 ft. Determine the cost per bank cubic yard for each of the stated conditions. Condition Material Depth of excavation (ft) Angle of swing (degrees) Percent swell Efficiency factor (min-hr) (1) Sandy clay 10 60 20 45 (2) Hard clay 18 90 50 (3) Rock, well blasted 15 90 50 (4) Sand and gravel 20 150 13 55

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

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4. A crawler hoe having a 2% -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 bey/hr, $0.223/bey; Condition 2.319 bey/hr, $0.210/bcy; Condition 3. 128 bey/hr, $0.523/bcy) Condition Material Depth of excavation (ft) Angle of swing (degrees) Percent swell Efficiency factor (min-hr) 45 (1) Moist loam, earth 12 60 (2) (3) Sand and gravel Rock, well blasted 16 14 120 80 14 50 45
Q.3/A Crawler hoe having a three Cyd bucket and whose cost per hour, including the wage to an operator, is $95 will excavate and load haul units under each stated condition. The maximum digging height of the machine is (25 ft.). Determine the cost of one cubic yard for each condition. Condition 1 2 3 Material Depth of excavation Percent swell Angle of swing Efficiency factor (min/hr) Sandy clay Hard clay Rock, well blasted 18 15 35 90 50 10 20 60 45 60 90 50 4 Sand & gravel 20 13 150 55
5. A crawler hoe having a 3-cy bucket and whose cost per hour, including the wages to an operator, is $86, will excavate and load haul units under each of the stated conditions. The maximum digging depth of the machine is 25 ft. Determine the cost per bank cubic yard for each condition. Condition (1) (2) (3) (4) Material Sandy clay Hard clay Rock, well blasted Sand and gravel Depth of excavation (ft) Angle of swing (degrees) 10 60 88 18 15 20 90 90 00 150 Percent swell Efficiency factor (min-hr) 45 50 24 20 50 50 55 35 13
9.5 A crawler hoe having a 24 -cy bucket and whose cost per hour, including the wages to an operator, is $109 will excavate and load haul units under each of the stated conditions. The maximum digging depth of the machine is 22 ft. Determine the cost per bank cubic yard for cach condition. (Condition 1: 315 bey/hr, S0.346/bcy; condition 2: 289 bey/hr, S0.377/bcy; condition 3: 99 bey/hr, S1.101/bcy) Condition (1) (2) (3) Moist loam, earth Rock, poorly blasted Material Sand and gravel 12 80 10 Depth of excavation (ft) Angle of swing (degrees) Percent swell Efficiency factor (min per hr) 15 60 100 14 50 45 50
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