In sea-water, especially in the variable waterline zone, sheet piles are exposed to major corrosive damages. Precedents are known, when over the years of operations, sheet pile walls were found with multiple holes through the whole section of the element, caused by corrosion.


Repair works in the zone of variable water level are performed in air-dry environment, using patented special underwater equipment - hermetic chamber. Works are performed keeping the structures in operational conditions. The repair technology depends on the degree of damages.


If the corrosive wear is less than 30% of the initial metal thickness, it will be sufficient to apply an anticorrosive coating on the steel surface. From the hermetic chamber the steel surface is blast cleaned and then a primer and a protective coatings are applied. Used materials are thoroughly selected, have the required certificates and have passed through long-term testing.


In presence of significant sheet piles damages and depending on the environmental conditions and Client’s request, a thin reinforced concrete wall could be built directly on the sheet piling surface or additional metallic elements could be added to the structure to increase the section. In underwater zone cathodic protection is applied.


Sheet pile walls protection works were carried out in the ports of Tallinn, Ventspils, Klaipeda, Saint Petersburg, Vysotsk, Kaliningrad, Gdansk.