Like most anything, a culvert or storm drain system can only be as strong as its weakest link. Typically, the weakest link is the joint, or the point where two pieces of pipe come together. Both reinforced concrete pipe and high density polyethylene pipe use a stab joint or bell and spigot configurations to join adjacent sections of pipe. This type of configuration can lead to slippage of the joint, during and after installation as backfill is compacted or settles, allowing for backfill material to enter into the system. Corrugated steel pipe, on the other hand, uses positive joint connections that maintain the structural integrity of the pipe throughout the system.
The types of corrugated steel pipe coupling bands that can be supplied by your local fabricator are:
- Corrugated
- Semi-corrugated
- Flat
- Universal
Excellent joint performance is an integral part in the service life of a culvert and storm drain system. These CSP coupling band types, along with o-ring or flat gaskets, can provide joint configurations that are soil-tight, silt-tight, leak-resistant, or water-tight. In addition, superior shear, moment, and tensile strength are what set corrugated steel pipe joint connections apart. These connections are preferred in high fill applications as well as steep slope installations. In addition, CSP can be produced in lengths of 50′ and greater, dramatically reducing or eliminating the number of joints!
For more information on corrugated steel pipe joints, check out the NCSPA’s Corrugated Steel Pipe Design Manual, take advantage of our Answer Desk (staffed by a professional engineer) or contact a local NCSPA member in your area.