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_GENERAL DOCUMENTS - C1981017 (239)
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_GENERAL DOCUMENTS - C1981017 (239)
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Last modified
11/2/2020 10:24:14 AM
Creation date
6/20/2012 11:20:15 AM
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DRMS Permit Index
Permit No
C1981017
IBM Index Class Name
GENERAL DOCUMENTS
Doc Name
Bid Documents (IMP) 1982 Technical Revisions Rock Tunnel Trash Pile
Permit Index Doc Type
General Correspondence
Media Type
D
Archive
No
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DRMS Re-OCR
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With a 32-foot reach (approximately 90% machine capacity) , a 245 backhoe can complete <br /> one cycle every 35 seconds (pg. 95, CH) . The bucket fill-capacity is assumr_-d to <br /> be 1000. Therefore, in a 50 minute working hour, a 245 backhoe with a 2.5 yd3 <br /> bucket can move 214 yd3 of material. At this rate, the job would be completed in <br /> 965 hours. <br /> A Caterpillar 245 backhoe rents for $18,400.00 per month, with an operating cost <br /> of $40.65 per hour. With a 10% location adjustment factor, the rental rate would <br /> be •$20,240.00. Using 22 days per month, 8 hours per day, the hourly rental rate <br /> would be $1I5.00 + $40.65 = $155.65. <br /> In addition to the backhoe which will be used to excavate material, a D9U dozer <br /> will be required to grade the excavated material. The Division determined from <br /> the production nomograph on page 41 of the Caterpillar Handbook, that a D9U with <br /> a blade capacity of 18.98 yd3 has an average production speed of 1.4 mph. The <br /> area to be graded is 46 feet in length. Therefore, a total of 2,914,560 ft2 must <br /> be graded. Assuming 50% overlap on each pass and a 15. 75 foot size blade, <br /> 24,271 ft2 can be graded each 50 minute work hour. Therefore, it would take 120 <br /> hours to grade the backfilled area. <br /> The total cost for downgrading the roads would be: <br /> 1 - 245 backhoe: 965 hours @ $155.65/hr. _ $150,202.00 <br /> 1 - D9U dozer: 120 hours @ $127.001hr. - $ 15,240.00 <br /> 2 - Operators: . 1,085 hours @ $ 15.00/hr. _ $ 16,275.00 <br /> TOTAL COST: $181,717.00 <br /> 19 L4 <br />
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