Expertise in underwater works
50+
years
Professional underwater works
Pellegrims Duikwerken delivers specialised underwater works for infrastructure and industrial projects. Technically sound. Safely executed.
Our activitiesSuccessfully delivered
500+
projects
Quality and safety
100%
focus
Specialised underwater works
Our services
Realisations
Underwater concreting and sheet pile inspection
Placing underwater concrete in a braced excavation, preceded by cleaning and inspecting the steel sheet piles.
Underwater concrete in a secant pile shaft
Excavating a secant pile shaft and placing underwater concrete to create a watertight, stable base slab for the next construction phases.
Maintenance and repair of pipe on a quay wall
Maintenance and repair works on a vertical pipe on an existing quay wall, including inspection and adjustment of fixings at the waterline.
Excavation and underwater concrete pour in a cofferdam
Excavating a construction pit and placing underwater concrete to form a working base/watertight seal, executed under controlled conditions with water present.
Underwater concrete in a secant pile shaft at two levels
Placing underwater concrete in a single secant pile shaft, executed at two different levels to form a working base and watertight seal for the next phase.
Wastewater treatment plant expansion
Excavation works and underwater concrete pours for the expansion of a wastewater treatment plant, carried out in the presence of groundwater.
Underwater cutting of sheet piles for a bridge pier
Underwater burning/cutting of sheet piles around a bridge pier to clear the structure for the next construction phase.
Excavating a secant pile shaft for underwater concrete
Excavation and cleaning of a secant pile shaft in preparation for the underwater concrete pour, focusing on a clean base and correct levels.
Cleaning sheet piles and placing underwater concrete
Cleaning and inspecting sheet piles in a braced excavation, followed by placing underwater concrete to form a watertight base slab.
Underwater cutting and removal of a structure
Underwater burning/cutting and controlled removal of a steel structural element, lifted out from the quay.
Underwater concrete pour using a float
Placing a large volume of underwater concrete using a float to keep the tremie pipe correctly submerged and pour bigger amounts.
Sinking a precast pump shaft
Sinking and welding precast pump-shaft elements together, with precise positioning and connection to the existing infrastructure.
Lock gate maintenance and replacement
Dismantling, lifting and replacing a lock gate, followed by alignment and checks to restore proper operation of the lock.
Core drilling in a concrete wall
Carrying out a large-diameter core drill opening in a concrete wall, using water cooling and controlled removal of drilling slurry on site.
Base slab in a sheet pile cofferdam
Placing an underwater concrete base slab inside a sheet pile cofferdam to create a stable, watertight foundation for the next construction steps.
Caisson installation
Installing and positioning a steel caisson at the quay using lifting operations, ready for further underwater works and anchoring.
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About
Specialists in underwater works since 1974
Duikwerken Pellegrims is a leading player in professional diving and underwater works, with a long history that began in 1974. What started as a family business under founder Rik Pellegrims grew—through his sons Kurt and Tom—into an internationally recognised specialist. Today, we are known for our expertise in underwater concrete pours, sinkings of shafts, installation of caissons, underwater cutting and welding, underwater maintenance and repairs, water treatment, and more.
With our own proprietary technique and an unwavering focus on safety, we deliver high-quality solutions for governments, contractors, and industrial clients worldwide. From the Oosterweel in Antwerp to tunnel projects in Miami, our track record shows that craftsmanship, innovation, and precision are at the heart of every successful underwater project. Since 2026, under the leadership of CEO Cis Vercouteren, we have been writing a new chapter—staying true to our DNA while aiming for sustainable growth.
Contact
Pellegrims Duikwerken
Meiboomstraat 25, 2820 Bonheiden
+32477794687
info@pellegrims.be