Longitudinally welded with narrow or wide groove
The wide spiral groove enlarges the sliding surface of thecorrugated sheath, thus allowing for a uniform support ofthe tendons. This will avoid increased friction during theinsertion and prestressing of the tendons and facilitate asteady sliding. Despite the high resistance to bending andtransversal load, the corrugation guarantees an excellentflexibility. The longitudinally... more

Longitudinally welded with wide groove, heavy duty version
The heavy-duty version is a very appropriate solution whenever persons have to step onto the tendons during installation or sheaths with higher bending resistance are required, for example when empty sheaths are to be inserted into concrete. This sheath version reduces the effects of undesirable inclination deviations of the prestressing duct (wobble effect). In this respect,... more

Longitudinally welded with narrow groove, flat oval cross-section
Only corrugated sheaths with small diameters can be used in slender prestressed concrete structures. Corrugated sheaths with flat oval cross-section are required for the application of multi-strand prestressing cables. Thus, the individual prestressing wires or strands cannot lie above each other during the prestressing process. The most important feature of the HYDRA... more

Stripwound Sheathing Pipes
Design but partly also economic challenges require the use of larger tendons in prestressing. For this purpose, we offer stripwound sheathing pipes in the diameter ranges 100 mm to 150 mm. We can manufacture these sheathing pipes in wall thicknesses from 0.4 to 0.6 mm (partly 0.7 mm). They can therefore be used for almost all applications.  more