Why are the bedding and backfill techniques for pre-stressed concrete pipe more economical than for flexible pipe materials such as steel and ductile iron?
Pre-stressed concrete cylinder pipe manufactured in accordance with the AWWA C301 standard are all designed as rigid structures; therefore, they do not derive their external load-carrying capabilities from the soil side support as do flexible pipe materials such as steel and ductile iron. Bedding a backfilling for these types of concrete pressure pipes is easier, resulting in more economy for the installation.
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