Find the expected production of a pusherscraper operation fo

Find the expected production of a pusher-scraper operation for a long narrow earthwork job. The fleet of scrapers, to be pushed by Komatsu D155 dozers, includes 16 637D-CAT. From a similar operation, the expected production for one scraper with adequate pusher support has been 222 M th in bank measure with estimated cycle time 5.8 min. Consider that on average one dozer may not be available for the pushing Select one: a. 3552 b. 3863 c. 2537 d. 3465

Solution

production of a pusher(komatsu D155) scrapper(16637D-CAT)

efficiency is taken as 50min/hr = 50/60 =0.83 (83%)for no data is given by the company

specificationss of komatsu D155:

cycle time= 4

volume per load = 12.3yd³

specifications of 16 637D-CAT :

cycle time in specification is given that fast cycle times hence use cycle time formula for scrapper to calculate the cycle time t_p = 1.44L_l + 0.25where L_l= loading timeof scrapper usally taken as o.85min.

now cycle time = 1.44*0.85 + 0.25 = 1.44min.

volume per load =34 yd³

no.of scrappers is taken as 2

productionof pusher = efficiency min/hr*volume perload /toatl cycle time

= 50*12.3/4 = 153.75 bcy/hr

production rate of scrapper = efficiency min/hr*no.of scrappers *volume perload /toatl cycle time

= 50*2*34/1.44 =2361.11bcy/hr

toatl production rate = 153.75+2361.11 = 2514.86bcy/hr =2537bcy/hr