Fast Traffic Connection with DYWIDAG Strand Tendons: Expansion of the I/11 in the Czech Republic
In eastern Czech Republic near its border with Slovakia, a 4,860m long section of the I/11 road is being expanded from Nebory to Oldrichovice. The project is an important infrastructure project that will connect the R48 expressway with Slovakia. The current route of the I/11 is being redirected in order to circumnavigate densely populated and highly frequented areas and to improve the traffic situation currently characterized by frequent traffic jams.
In this section, DYWIDAG-Systems International Czech Republic was asked to supply post-tensioning systems and to posttension a total of 15 bridge structures as the subcontractor. The largest of these structures are the SO 203 and SO 207 bridges.
The SO 203 bridge across the Neboruvka River consists of two separate superstructures that were each divided into five sections. Since the girders were cast in stages, the continuously coupled post-tensioning tendons had to be filled with strands, and the couplers had to be completed before each casting. Due to the presence of extensive reinforcement, prefabricated tendons could not be used. Therefore, the strands had to be pushed in using a special process, and the couplers had to be completed in a very small space inside the girders.
In total, 128.8t of Type 19-0.62" and 12-0.62" Strand Tendons with 56 active OVM.M15A-19 Anchorages and eight OVM.M15A-13 Anchorages were used for the SO 203 bridge. Eight HL 6-19 Anchorages and 8 HL 6-12 Anchorages, Type SUSPA Systems, were used as passive anchorages. Furthermore, DSI supplied 60 OVM.L15A-19 couplers.
The SO 207 bridge also consists of two separate superstructures that are each 134.7m long. The contractor decided to cast the complete structure at one time. 104t of Type 19-0.62" Strand Tendons were installed in the SO 207 bridge.
60 OVM.M15A-19 Anchorages were used as active anchorages, 12 HL 6-19 Anchorages, Type SUSPA Systems, were used as passive anchorages.