KCC provides underwater obstruction clearance services to remove seabed obstructions that would damage dredging plant or prevent the dredge from reaching the specified formation level. Obstructions removed by KCC's commercial divers include concrete debris, old timber and steel piles, abandoned cables and pipelines, rock fragments, and general seabed debris.
Clearance methods include oxy-arc cutting of steel and concrete, hydraulic rock-breaking, manual removal of debris by diver with crane barge assistance, and vacuum excavation for fine debris around utilities. All removed material is lifted to the surface and disposed of in accordance with the project waste management plan.
Compliance: All cutting and demolition works are carried out to IMCA D 045 and HSE Diving at Work Regulations 1997. Oxy-arc cutting follows IMCA D 010 (The Use of Oxy-Arc Cutting Underwater). Waste disposal complies with Hong Kong Environmental Protection Department requirements.
Obstructions left in the dredge path cause costly plant damage and programme delays. KCC's divers can remove obstructions efficiently and safely — often clearing a path for the dredge within a single shift — keeping the dredging programme on track.
Pre-Dredge Obstruction Survey
Pre-dredge diver survey to identify and record seabed obstructions, utilities, and unexploded ordnance indicators before dredging plant is mobilised.
Post-Dredge Inspection
Post-dredge diver inspection to confirm formation level, check for over-dredge, and inspect adjacent structures for dredging-induced movement or damage.
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Subsea Engineering
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All diving operations conducted to IMCA, ADCI, HSE & HKCP standards
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