Steel Sheet Pile-type Quays
Steel sheet pile-type mooring quays are constructed by driving steel sheet piles into the ground to form an earth-retaining wall. The most common steel sheet pile type mooring quay is formed using tie rods to connect the steel sheet pile wall to a strut structure (steel pipe, steel sheet pile, shape, etc.) installed behind the wall. Depending on the scale of the load to be supported, two kinds of piles are used for the pile wall commonly adopted U-type steel sheet piles and steel pipe piles having connection joints.
In cases when a small load is applied, as in ports with shallow water depth, a self-supporting wall structure is adopted without the use of a strut structure and tie rods. Even when using steel sheet piles or steel pipe piles, the front surface of the pile wall is subjected to harsh corrosive marine environments.
Features of Corrosion in Marine Environments
The environments where port and harbor steel sheet pile structures are applied are roughly classified into five zones, namely, atmospheric zone, splash zone, tidal zone, submerged zone, and mud zone.
In cases where long steel products such as steel sheet pile and steel sheet pile extend through multiple environments (tidal zone, submerged zone, and mud zone), macro-cell corrosion attributable to differences in these application envi ronments occurs.
The area where serious problem arises regarding the corrosion of steel sheet pile structures without corrosion-protection measures is the splash zone and just beneath the mean low water level (M.L.W.L.).
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