Customer case

Successful HDPE coated pile -project in tight time frame and demanding soil conditions

September 23, 2016 6 min read

TYKS T3 project

Case details

Product Infrastructure
Country Finland
Company Turku University Hospital (TYKS)
Industry Building structures and infrastructure

Turku University Hospital (TYKS) is building a massive new building, named T3 Hospital, on top of existing E18 freeway and a rail road. New building will have total area of 54 000 m2 in eight stories. Total budget for the project is 158 M€.

Due to tight schedule of the project and demanding soil conditions, drilled RD piles were chosen for the project. Pile sizes RD800, RD600 and RD400 are used. RD800 piles are drilled three meters (4xD) and smaller ones 2 meters into the bedrock and grouted to the hole to ensure rigid connection. Piles are inclined and also tension anchors are used to take heavy accidental lateral and lifting loads.

Due to cold winters in Finland, a de-icing salt is often used for roads. This causes severe corrosion environment for steel piles. In TYKS T3 project RD800 piles are exposed to de-icing salt and the corrosion is taken care with 3-layer HDPE coating on piles. Additional to the coating, the resistance of the piles has been calculated with extra 2 mm corrosion allowance to wall thickness.

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Turku University Hospital (TYKS) is building a massive new building, named T3 Hospital, on top of existing E18 freeway and a rail road. New building will have total area of 54 000 m2 in eight stories. Total budget for the project is 158 M€.

Due to cold winters in Finland, a de-icing salt is often used for roads. This causes severe corrosion environment for steel piles.

“We prepared for damages in the coating with training of repair and a big bunch of repair materials. Now we have installed 97 pcs of coated piles and we have used only handful of repair patches. Our installation team has learned more gentle way to handle piles. I think this helps us also in normal projects, because they are handling also un-coated piles with more care.” Kai Jaakkola, Drilling supervisor, Lemminkäinen.

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