3 A An Extract Of The Corridor Through A Railway Scheme Is Shown In Figure 2 It Requires Cutting Of The Existing Gro 1 (138.83 KiB) Viewed 15 times
3 A An Extract Of The Corridor Through A Railway Scheme Is Shown In Figure 2 It Requires Cutting Of The Existing Gro 2 (25 KiB) Viewed 15 times
3. (a) An extract of the corridor through a railway scheme is shown in Figure 2. It requires cutting of the existing ground levels between chainages 0+200 to 0+380 to the formation level of the subgrade. The cross-sectional area at each chainage is given in the diagram and the average swell factor of the soil is 1.25. It is intended to use 2 excavators, each having 1.6m³ bucket capacity; and 2 number 18 m³ dumper trucks. Using relevant calculations, establish which of the two scenarios below is a faster option and by how many weeks to complete the works: (i) one dumper truck assigned to each excavator (ii) two excavators filling one dumper truck at a time Existing levels A = 150m² Chainage 0+200 A = 225m² Chainage 0+230 A = 355m² Chainage 0+260 A = 405m² Chainage 0+290 A = 158m² Chainage 0+320 A = 255m² Chainage 0+350 A = 505m² Chainage 0+380 Formation levels Figure 2 Corridor of railway and cross-sectional areas at cutting chainages.
You may assume the following Excavator bucket has 75% fill capacity and output is 75 cycles per hour. • Dumper truck travel and repositioning time is 4.5 minutes. ● A working day is 8 am - 4 pm with an hour-long break. 5 working days per week ●
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