Post-Tensioning Systems for a Coal-Fired Power Station
In the city of Opole in southwestern Poland, the Opole coal-fired power station has been generating electricity since the 1990s. In 2014, the modernization and enlargement of the power plant started with the addition of two new 900MW blocks. Once completed, the facility will be Poland’s largest coal-fired power station.
Within the scope of the expansion, three identical fly ash silos were built. To posttension each tank, DSI Poland supplied 274 Type SUSPA-Systems Strand Tendons with 548 Type 6-7 anchorages. Approximately 106t of prestressing steel and 13,000m of corrugated ducts were needed for these tendons per tank.
DSI’s on site installation of the post-tensioning faced some challenges. This included pushing the prestressing steel strands into the ducts over the complete height of the silo with the highest ones reaching up to 65m above ground level. This operation had to be performed in compliance with all of the extremely strict safety rules that were in placeon the jobsite while, at the same time, not interrupting the work of other onsite teams. The vertical transportation of the stressing equipment was another challenge, often involving struggle with high winds and rain while working on unshielded platforms high above the ground.
Thanks to the optimized number of system parts and their robust design, the posttensioning tendons were installed, stressed and grouted efficiently, quickly and trouble free on site.