Nestable corrugated steel pipe is composed of two half round segments which are bolted together to form a round pipe. There two standard method to form a round pipe. flanged nestable corrugated steel pipe and overlapped corrugated steel pipe. It suitable for the small diameter pipe and easy to ship to the oversea marktert.
The minimum allowable depth of cover is the largest of:
For roads H=B/8+0.2(m) H=B/6(m) and not less than 0.6（m）
For railways H=B/4 and not less than 0.6(m)
There is a possibility to reduce depth of cover provided that suitable checking calculations will be made.
|Flexible structure||Plate thickness||Kinds of standard corrosion protection||Required average min value(um）|
|plates||≧6mm||Hot zinc galvanizing||85|
|≧3mm do < 6mm||Hot zinc galvanizing||70|
|≧1.5mm do < 3mm||Hot zinc galvanizing||55|
|Bolts and nuts||-||Hot zinc galvanizing||45|
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