Page 286 - Buried Pipe Design

Rigid Pipe Products 257

26.4
B d 1.8 3.96 ft
12
That is, the 4.0-ft trench width just exceeds the transition width, and the
load calculated for a 4.0-ft-wide trench is just slightly conservative.
H 5.0
2.27 (from Fig. 2.5, C c 3.4)
B c 2.2
r sd p 0.5
2
W c 3.4 (120) (2.2) 1974 lb/ft

W d ≈ W c at transition width
2. Determine the live load.

W L 340 (from Fig. 2.19)
3. Determine the total load.

2112 340 2452 lb/ft

4. The combined loading is

p (150 50) (2.0) 400 lb/in 2
2112 340
w (1.5) 1936 lb/ft
1.9
2
Try T50, P 500 lb/in , and W 8100 lb/ft:

P p
500 400

w W P 9100 4070 lb/ft
500
Since 4070 lb/ft 1936 lb/ft, T50 is acceptable. Alternately the pipe could
be chosen from the selection curves of Fig. 5.4 (see AWWA C403-95).

Clay Pipe
Vitrified clay pipe is manufactured from clays and shales which are
chemically inert. In the manufacturing process, various clays and
shales are pulverized, screened, and placed in storage bins. Blended
materials are carried to the pugmill and mixed and moistened with
water for a proper mix consistency for extrusion. The mix is then
forced through a die into a vacuum chamber where trapped air is