Page 104 - Trenchless Technology Piping Installation and Inspection
P. 104
Existing Pipeline Renewal and Replacement Methods 71
Liner Pipe Trench Width,
Diameter (in.) B (ft)
d
4 1.75
6 2.00
8 2.25
10 2.50
12 2.50
15 3.50
18 3.75
21 4.00
24 4.50
30 5.00
36 5.50
42 6.00
48 6.50
54 7.00
60 7.50
72 8.50
84 9.50
96 10.50
TABLE 2.10 Standard Trench Widths
Soil Type w (lb/ft ) ku (dimensionless)
3
Sand & gravel 110 0.165
Saturated topsoil 115 0.150
Ordinary clay 120 0.130
Saturated clay 130 0.110
TABLE 2.11 Typical ku′ Values
