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 bey; Condition 3. 128 bey/hr, $0.523/bey) Condition Material Depth of excavation (ft) Angle of swing (degrees) Percent swell Efficiency factor (min-hr) 45 (1) (2) Moist loam, earth Sand and gravel Rock, well blasted 12 16 14 60 80 120 14 50 45

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 bey; Condition 3. 128 bey/hr, $0.523/bey) Condition Material Depth of excavation (ft) Angle of swing (degrees) Percent swell Efficiency factor (min-hr) 45 (1) (2) Moist loam, earth Sand and gravel Rock, well blasted 12 16 14 60 80 120 14 50 45

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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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
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
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
A hydraulic excavator with a 2 cubic yard heaped capacity bucket is excavating in common earth. The depth of the excavation is 8 feet. The excavator has a maximum rated digging depth of 16 feet. The excavated material will be positioned so that the swing angle is 75 degrees. The job efficiency is 55 minutes per hour. Find the expected production per hour.
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
Choose the lowest size and the required number of crawler hoes to excavate 828864 b-Cyd of sand & gravel in 4 months. A size one Cyd excavator (including the wage's operator) costs $80 /hr. with an increment of $5 per extra 0.5 Cyd. Depth of excavation 12 ft, Swell 25%, and efficiency 65%. Suppose the work is 8hr/day. Estimate the total expected cost.
A contractor is to excavate an area of 350′ × 150′ to a depth of 9′ and haul it by dump truck to a site where it is to be used for fill. The soil will then be fully compacted. If the swell factor is 25 percent and the shrinkage factor is 18 percent. Estimate the total bare cost for the job (excavation only) using a 2½ CY front-end loader, track mounted. Consider average nation price. Use the crew below.
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
A bottom dump hydraulic shovel with a 5 cubic yard heaped capacity bucket is excavating in hard clay. The depth of the excavation is 12 feet. The shovel has a maximum rated digging depth of 34 feet. The haul units can be positioned so that the swing angle is 60 degrees. The job efficiency is 50 minutes per hour. Find the expected production per hour.
A crawler hoe having a 3 1/2 cy bucket and whose cost per hour, including the wages to an operator, is $130 will excavate and load haul units under each of the stated conditions. The maximum digging depth of the machine is 26 ft. Determine the cost per bank cubic yard for each condition. (1) Rock, well blasted Condition (2) Sand and Material gravel 15 Depth of excavation (f) Angle of swing (degrees) Percent swell 14 90 120 15% Efficiency factor (min per hr) 40 45 $0.916/bcy 50.451/bcy 50.954/bcy $0.417/bcy 50.897/bcy $0.394/bcy 50.988/bcy O 50 378/bcy
Calculate the cost per cubic yard to move earth for a project that plans to use a back-hoe and system of trucks. All equipment carries a rated heaped capacity, has a fill factor of 100%, and works 55-min hours. Back-hoe excavator costs are $105/hr (including operator), cycle time is 0.25 min, and bucket heaped capacity is 5.5 cy. Truck costs are $150/hr (including operator), dump time is 0.70 min (maneuver, dump, turn), heaped capacity is 32.5 cy, and 10 trucks are available for the project. Hauling equipment operates in one direction from A to B to C and finally to D according to the following table. Find the following values (note: carry out your calculations to at least 4 decimal points to obtain the best results): Section Load Length (ft) Speed (mph) full full A 2,800 2,400 2,900 2,800 в 18 empty empty 37 17
Assuming that each load is a full-capacity load, howmany truckloads are required to construct the fill?