Metal bellows are metal pipes made of galvanized or non-galvanized low carbon steel with spiral folding bites and used for reserved holes in post-tensioned prestressed concrete structural members
Metal corrugated pipe is made of galvanized or ungalvanized thin steel strip by pipe winding machine through pressure wave, spiral folding bite, with light weight, good stiffness, easy bending, simple connection, small friction coefficient and good adhesion to concrete.
1. Used at working site, making duct at working site,
2. Operated easily, nimble structure, working steady
3. Make round duct or flat duct, used for post tension
4. Steel strip can be 0.35mm, 0.4mm
5. Making black steel duct and galvanized steel duct
Spiral prestressed corrugated pipe making machine
Corrugated pipe making machine
Audited Supplier 
1. Used at working site, making duct at working site,
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