Page 104 - Buried Pipe Design
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80 Chapter Three
Figure 3.5 Class of bedding for rigid sewer pipes. [Note: In rock trenches, excavate at
least 6 in below bell. In unstable material, such as peat or expansive material, remove
unstable material and replace with a select fill material (consult competent soils engi-
neer).] (Reprinted, by permission, of Water Pollution Control Federation.)
TABLE 3.2 Bedding Factors
Bedding class Load factor
A 2.8–3.4
B 1.9
C 1.5
D 1.1
