A project to move packed earth requires you to decide whether to use a dozer/scraper operation or excavator/truck operation. Determine the most economical operation based on the dozer/scraper operation estimated at $1.25/cy. All equipment carries a rated heaped capacity, has a fill factor of 100%, and works 45-min hours. Excavator costs $95/hr （including operator), cycle time is 0.28 min, and bucket heaped capacity is 5.0 cy. Truck costs $150/hr.(including operator), dump time is 0.5 min （maneuver, dump, turn), heaped capacity is 31.7 cy, and 12 trucks are available for the project.Hauling equipment operates in one direction from A to B to C and finally to D. Section Load Length (ft) Speed (mph) A full 3000 9 B full 2500 17 C empty 3000 36 D empty 3000 16

A project to move packed earth requires you to decide whether to use a dozer/scraper operation or excavator/truck operation. Determine the most economical operation based on the dozer/scraper operation estimated at $1.25/cy. All equipment carries a rated heaped capacity, has a fill factor of 100%, and works 45-min hours. Excavator costs $95/hr （including operator), cycle time is 0.28 min, and bucket heaped capacity is 5.0 cy. Truck costs $150/hr.(including operator), dump time is 0.5 min （maneuver, dump, turn), heaped capacity is 31.7 cy, and 12 trucks are available for the project.Hauling equipment operates in one direction from A to B to C and finally to D. Section Load Length (ft) Speed (mph) A full 3000 9 B full 2500 17 C empty 3000 36 D empty 3000 16

Fundamentals Of Construction Estimating

4th Edition

ISBN:9781337399395

Author:Pratt, David J.

Publisher:Pratt, David J.

Chapter10: Pricing Excavation And Backfill

Section: Chapter Questions

Problem 7RQ

See similar textbooks

Similar questions

A project to move packed earth requires you to decide whether to use a dozer/scraper operation or excavator/truck operation. Determine the most economical operation based on the dozer/scraper operation estimated at $1.25/cy. All equipment carries a rated heaped capacity, has a fill factor of 100%, and works 45-min hours. Excavator costs $95/hr (including operator), cycle time is 0.28 min, and bucket heaped capacity is 5.0 cy. Truck costs $150/hr (including operator), dump time is 0.5 min (maneuver, dump, turn), heaped capacity is 31.7 cy, and 12 trucks are available for the project. Hauling equipment operates in one direction from A to B to C and finally to D. Section ABCD Load full full empty empty Length (ft) 3,000 2,500 3,000 3,000 Speed (mph) 9 17 36 16
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.
Calculate the total operation time for this construction activity if the volume of soil to be removed is 8 cu.m. (considered 33% for bulking of materials.) The speed of dumptruck is 30 kph and travel distance (round trip) from the source to disposal area vice-versa is 6 km. The bucket size of excavator is 0.50 cu.m at 0.50 min loading time, tipping time is 4 mins. a. 15.18 minutes b. 22.02 minutes c. 25.32 minutes d. 30.00 minutes
Given the excavator information below, calculate 1) Hours required to complete 1000 CY of excavation work. 2) Cost of the operator to complete the work if his hourly wage is $35. Production Information Bucket Cycle of Operation Efficiency 3 cubic yard (CY) 40 second per cycle 45 mins per hour
The crew hour productivity rate for cast in place concrete is: O 0.128 ch/m3 O 0.067 ch/m3 O 0.111 ch/m3 O None of the above QUESTION 15 The man hour cost for cast in place concrete is: $38.50/mh O $40.43/mh 37.33/mh O None of the above QUESTION 16 The crew hour cost for cast in place concrete is: $283.00/ch $224.00/ch $269.50hch O None of the above
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 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.
For a task of transporting excavated materials and taking into your account following assumptions table; estimate: Needed number of trucks per day; The cost of transporting one cub meter. Track capacity 10 m3 Allowed truck speed 12 km/h Truck loading time 3.5 minutes Transportation distance 5 km Working hours per day 9 hours Daily cost of one truck 20 OMR per day Required quantity of excavation 900 m3/day
A contractor is considering the purchase of an earthmover to avoid the cost of a rental unit. The earthmover costs $350,000 initially and will cost $7000 per year to store and maintain. When used, the operating cost is $300 per day to the contractor. A rental unit costs $500 per day to rent and operate. The contractor estimates that he would keep the earthmover for 20 years and could then sell it at salvage for $20,000. He requires a 12% rate of return on any investment. Determine how many days per year he would have to operate the earthmover to make it a worthwhile purchase. Sketch the breakeven chart for this situation.
Q2: - Compute the total volume of borrow-pit by using triangle method. 1.5 L4 1.6 T1.3 1.2 1.7 1.5 1.6 1.8 14 1.2 1.9
Assuming that each load is a full-capacity load, howmany truckloads are required to construct the fill?
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.