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Replacement mooring dolphins Roompot Lock Oosterschelde stormsurgebarrier

The replacement of the dolphins near the Roompot Lock is part of the project to repaint the steel parts of the stormsurgebarrier. Client Rijkswaterstaat contracted the Oosterschelde Conservering Groep (OSG) for the entire scope. Sistercompany VolkerRail has been nominated as subcontractor and was also responsible for the replacement of the dolphins.  

Main contractor
Oosterscheldekering Conservering Groep (OCG)

The project

Volker Staal en Funderingen receivedthe contract from VolkerRail for the replacement of the dolphins. The dolphins were located on both sides of the Roompot lock which is part of the Oosterschelde stormsurgebarrier.  On both sides 4 dolphins are being used for mooring vessels while waiting for crossing the lock and another 4 on both sides are used to guide the vessels in the lock.

The Scope

The scope of work included the removal of 20 old dolphins fitted with fendering and bollards and replacing them with 16 new dolphins also with fendering and bollards. The diameter of the piles was 1020 and 1220 mm.

Detail design and fabrication

Part of the scope was also detail design of the dolphins. After approval of the design fabrication of the fendering and the bollards could start in our own fabrication shop. Parts of the welding was done by our latest asset: the welding robot. The shot blasting and application the epoxy painting was done in our paint shop.


Using our own cranebarge with 90 tons crawlercrane and piling equipment the old dolphins were dismantled and extracted. After that the new piles for the dolphins were installed using a vibratory hammer. After installation the prefabricated fendering was installed including the baseplate on top of the pile. VolkerRail and sister company Aquavia took care of the lighting of the dolphins.