Q5. Estimate cost of laying a 300mm concrete pipe The following data are extracted from a pipe-laying contract: Concrete pipe diameter: inside 300mm, outside 334mm • Overall pipe length • Width of trench • The trench depths and lengths are in table 6. = 425m = 750mm Page 3 of 4 Table 6: Trench depths Depth (m) Length (m) 1.50 131 2.00 2.50 274 20 Calculate the total cost, and cost for each depth, to a contractor of excavation, planking and strutting, laying pipes, surrounding concrete as shown in Figure 2 and backfilling, using the following data. Labour and plant for pipe-laying (up to 300mm diameter): One JCB 3C excavator =£31.64/h • Small plant, pumps and compactor One pipe layer = £5.85/h = £15.00/h Two labourers =£26.00/h Assume a working week is 50 hours. Also, assume an average output of 50 linear meters of pipe laid per week, the output varying with the depth of trench. The output includes excavating, trimming, pipe laying, concreting and backfilling. Labour allowance for planking and strutting are shown in Table 7. Planking and strutting materials are recoverable (reusable) and the material cost is £1.30 per m' for this project.
Q5. Estimate cost of laying a 300mm concrete pipe The following data are extracted from a pipe-laying contract: Concrete pipe diameter: inside 300mm, outside 334mm • Overall pipe length • Width of trench • The trench depths and lengths are in table 6. = 425m = 750mm Page 3 of 4 Table 6: Trench depths Depth (m) Length (m) 1.50 131 2.00 2.50 274 20 Calculate the total cost, and cost for each depth, to a contractor of excavation, planking and strutting, laying pipes, surrounding concrete as shown in Figure 2 and backfilling, using the following data. Labour and plant for pipe-laying (up to 300mm diameter): One JCB 3C excavator =£31.64/h • Small plant, pumps and compactor One pipe layer = £5.85/h = £15.00/h Two labourers =£26.00/h Assume a working week is 50 hours. Also, assume an average output of 50 linear meters of pipe laid per week, the output varying with the depth of trench. The output includes excavating, trimming, pipe laying, concreting and backfilling. Labour allowance for planking and strutting are shown in Table 7. Planking and strutting materials are recoverable (reusable) and the material cost is £1.30 per m' for this project.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Q5. Estimate cost of laying a 300mm concrete pipe
The following data are extracted from a pipe-laying contract:
• Concrete pipe diameter: inside 300mm, outside 334mm
• Overall pipe length
• Width of trench
• The trench depths and lengths are in table 6.
= 425m
= 750mm
Page 3 of 4
Table 6: Trench depths
Depth (m)
1.50
Length (m)
131
2.00
274
2.50
20
Calculate the total cost, and cost for each depth, to a contractor of excavation, planking and
strutting, laying pipes, surrounding concrete as shown in Figure 2 and backfilling, using the following
data. Labour and plant for pipe-laying (up to 300mm diameter):
. One JCB зC еxcavator
= £31.64/h
• Small plant, pumps and compactor
• One pipe layer
• Two labourers
= £5.85/h
= £15.00/h
=£26.00/h
Assume a working week is 50 hours. Also, assume an average output of 50 linear meters of pipe laid
per week, the output varying with the depth of trench. The output includes excavating, trimming,
pipe laying, concreting and backfilling. Labour allowance for planking and strutting are shown in
Table 7. Planking and strutting materials are recoverable (reusable) and the material cost is £1.30
per m' for this project.
Transcribed Image Text:Assume a working week is 50 hours. Also, assume an average output of 50 linear meters of pipe laid
per week, the output varying with the depth of trench. The output includes excavating, trimming,
pipe laying, concreting and backfilling. Labour allowance for planking and strutting are shown in
Table 7. Planking and strutting materials are recoverable (reusable) and the material cost is £1.30
per m? for this project.
Suitable material
Concrete class
E 150 mm min. cover
may be formed
horizontal surface
334 mm
100 mm
Width of trench = 750 mm
Figure 2: Concrete surround to pipe
Table 7: Labour allowance for planking and strutting
Depth (m)
Labour hours per
metre
1.50
0.2
2.00
0.3
2.50
0.7
• Ready-mix concrete for bedding (assume wastage of 5%)
• Pipe, concrete class L 300mm diameter (assume wastage of 3%)
= £100.00/m?
= £26.56/m
Allowance for disposal of surplus material
Assume all excavated material is suitable as backfill and compacts to original volume
The excavator is used to load tipper trucks with surplus material. The loading, travel,
discharge and return cycle time of one 4m3 tipper-truck is 21 minutes. The cost of a 4m3
tipper-truck including driver is £32.16 per hour.
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