A 2Km long underground concrete pipe has to be installed. A trench that is 2 m d

Question

A 2Km long underground concrete pipe has to be installed. A trench that is 2 m deep w s m wide muu compacting a first, the pipe is then installed, and the trench has and and the soil to its original to be reinstated bybackfilling material bank density. The excavation will be carried out by a backhoe,the pipe will be compacted by a vibratory plate. The pipe diameter is 1 m, and the volume occupied by the causes a excess in the material excavated and it must be hauled away from the job site.Given the followings: Soil: Load factor LF 0.75 Shrinkage Factor sF -0.8 Bank density 1650 m Backhoe: Production 42 m hr equipment and labor cost 80 Dhsihr Hauling: Production 25 tons/hr equipment and labor cost 45 Dhs/hr Backfill: Vibratory plate 100 CCM/hr equipment and labor cost sr 100 Dhshr a) Determine the total direct cost in Dhs for the excavation (10 pts) b) Determine the total cost of backfilling (5 pts) c) Determine the total direct cost of hauling the excess material (5 pts 1.5 m 2,0 m

Explanation / Answer

(a). Volume of the trench excavated = 1.5*2*2000 = 6000m3.
   Loose volume = 6000/Load factor = 6000/0.75 = 8000m3.
   Time taken for excavation = 8000/42
   Cost of excavation = (8000/42)*80 = 15238.10 Dhs (answer)

(b). Volume of baxk fill = 6000 - 1570.8 = 4429.2 m3.
   Time requires for backfill compaction = 4429.2/100 = 44.292 hrs
   Cost = 44.292*100 = 4429.2 Dhs (answer)

(c). Amount of Excess material = 2000*3.14*(0.5)2 = 1570.80 m3.
Mass of that material = 1650*1570.80 kgs = 2591.81 tons
   Cost of hauling = (2591.81/25)*45 = 4665.26 Dhs (answer)

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