Marine Construction
Subsea piling, underwater cofferdams, and berth rehabilitation.
Subsea piling, underwater cofferdams, and berth rehabilitation.
Marine Civil Construction & Underwater Engineering
Dock hydro-demolition, sheet pile repair, cofferdam de-silting, and underwater concrete placement.
Marine infrastructure endures constant wave action, ice impact, corrosion, and biological fouling that degrade concrete and structural steel over time.
Chow Marine provides turnkey marine construction and rehabilitation services across harbor docks, navigational locks, bridge piers, and offshore intake structures. We combine heavy equipment rigging with commercial diving expertise.
Our capabilities include underwater hydro-demolition to remove deteriorated concrete, installation of composite pile jackets, sacrificial cathodic protection systems, and underwater tremie concrete pours using anti-washout admixtures.
We also operate high-volume submersible dredge pumps capable of evacuating silt, gravel, and organic debris from flooded cofferdams and intake sumps, establishing clean bedrock footings for structural foundations.
Bathymetric & Structural Survey
Sonar depth profiling, visual diver structural mapping, and concrete core test review.
Cofferdam & Silt Excavation
Deployment of submersible agitation dredge pumps to clear accumulated sediment down to sound bedrock.
Hydro-Demolition & Rebar Prep
Selective water jet removal of compromised concrete and abrasive-free cleaning of structural reinforcement steel.
Formwork & Underwater Grouting
Erection of sealed fiberglass jacket forms and controlled injection of anti-washout structural marine grout.
| Concrete Repair Depth | Subsea down to 30m |
| Grout Compressive Strength | Up to 65 MPa Marine Grade |
| Silt Dredge Capacity | Up to 250 m³/hr Slurry |
| Welding Certification | CWB Certified Underwater Welder |
| Barge Support | Self-Propelled Crane Barges |
Commercial Bulk Pier Sheet Pile Wall Stabilization
Installation of 85 sacrificial zinc anode banks and encapsulation of 42 corroded steel H-piles using epoxy grout jackets.
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How does underwater concrete placement cure in cold marine water?
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How does underwater concrete placement cure in cold marine water?
We utilize specialized non-shrink marine grouts and tremie concrete formulations with anti-washout cellulose polymers that cure reliably even in cold freshwater and seawater environments.
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Can you work on retaining walls without halting surrounding dock traffic?
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Can you work on retaining walls without halting surrounding dock traffic?
Yes. Our operations are staging-conscious and predominantly water-based using our support vessels and barges, leaving dock surfaces clear for shore crane and truck traffic.
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Are your underwater welding procedures certified by the Canadian Welding Bureau (CWB)?
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Are your underwater welding procedures certified by the Canadian Welding Bureau (CWB)?
Yes. All Chow Marine underwater welders hold valid CWB underwater welding qualifications under CSA W48 / AWS D3.6 standards.
Ready To Mobilize Crew & Tooling?
Connect directly with our Hamilton operations superintendent for emergency rapid mobilization, site evaluation, and firm engineering proposals.