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Post-tensioning systems for Poland’s largest power station Opole

In the city of Opole in southwestern Poland, the Opole 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 900 MW 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 post- tension each tank, DSI Poland supplied 274 strand tendons with 548 anchorages. Approximately 106 t of prestressing steel and 13,000 m 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 65 m above ground level. This operation had to be performed in compliance with all of the extremely strict safety rules that were in place on the jobsite while, at the same time, not interrupting the work of other on-site 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.

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