Post on 06-Jan-2016
description
Earthwork & Volumes Spec Requirements End Areas End-area Volumes Borrow Pit Volumes Mass Diagrams Cost Estimates
Earthwork Specs Payment based on excavation (Cut)
Specs define methods for cut and fill Typically not paid for fill
Based on “Excavation measured in place as computed from survey notes” Not weighing, counting truck rounds Look for spec allowing contractor to
dispute volumes in a certain area
Excavation Specs Common excavation
Determined from survey notes Describes most of work
Rock/Muck Rock requires blasting Muck requires deep dig, granular fill Before/after volume survey
Haul Payments Volume payments - $/cy Excavation
Separate lines for common, rock , muck Free Haul - Stations Overhaul - $/cy-stations Borrow - $/cy
Covers cost of lease, haul, reclamation Waste - $/cy
End Areas Based on
Cross-sections
CL
Typical section Area – ft2
Cut Fill
Construction Grade Staking Based on “typical section” Stake centerline, slope “breakouts”
Slope Stakes
12’ + 4’(4) + 8’ + 6.3’(4) = 61.2’
Slope Staking
12’ + 3.7’(4) = 26.8’
End Area Calculations
End Area Calculations Level Sections
3-level Sections
5-level Sections
Other Sections
Triangular Sections
Level Sections
)()2
( cswcw
dcA
6.390)2
404.31(6.7)
2(
wdcA
6.390)5.16.740(6.7)( cswcA
3-Level Sections
)(2
)(4 rLrL dd
chh
wA
34.338)6.295.30(2
8.6)4.60.7(
4
40A
5-Level Sections
)(2
1rrLL dhdhcwA
2.258)3.277.61.239.6308.5(2
1A
Transition Sections
)(4
1)
2(2
1whh
wA
6.15)6.240(4
1cA 0.15)0.230(
4
1fA
End Area Calculations Planimeter Coordinate Calculations
Similar to coordinate area Start/end at same point
)()( 1121
iiii dfdfA
Coordinate Areas
Assign (0, 0)30 ‘ top, left shoulder (-15, 0)
15
0
0
0
8.25
2.7
20
8.8
7.14
0.7
0.0
0.8
0.18
1.8
0.24
3.9
1.29
4.9
15
0
0
0
Coordinate Calc Example
0
0
15
0
1.29
4.9
24
3.9
18
1.8
0
0.8
7.14
0.7
20
8.8
8.25
2.7
15
0
0
0
2.338
)15(0)1.29(0)24(4.9)18(3.9)0(1.8
)7.14(0.8)20(0.7)8.25(8.8)15(2.7
)15(4.9)1.29(3.9)24(1.8)18(0.8)0(0.7
)7.14(8.8)20(2.7)8.25(0)15(0
2
1
A
End-Area Volumes
AI = 390.6 ft2
AH = 338.3 ft2
AG = 144.8 ft2
AE = 15.6 ft2
AE = 15.0 ft2
AD = 113.2 ft2
AB = 258.2 ft2
AA = 338.2 ft2