MMC Diving Services

"Since 1964"

Telephone: 01983 864 330

  • Underwater welding in Guernsey

    Underwater welding in Guernsey

    MMC Divers cleaned back the steel in preparation for the welding with a scrabbler and a needle piner, we then welded x30 120 kilo anodes to all the fender piles.


Client: Guernsey Harbour Authority

Contractor: Concrete repairs Ltd

Duration: 3 months

Date posted: 11-11-2013

Guernsey Harbour Authority have started concrete repairs to the commercial dock 4. Two large existing dock cranes have been removed in preparation for two new ones. Concrete Repairs Ltd are well underway with the hydro demolition on the concrete pier legs and beams, shuttering / pouring the matrix below the wharf.

MMC Divers cleaned back the steel in preparation for the welding with a scrabbler and a needle piner. We then welded thirty 120 kilo anodes to all the fender piles.

Phase 2 consisted of lowering fifteen 1/2 tonne pile brackets onto the seabed for wet storage to save on crane hire. Using lift bags, our divers floated the brackets just off the seabed, walked them into position and clamped them in place.

Using underwater breakers we had to break away the concrete above the pile clamps to expose the reinforced steel inside the legs; later welding contact brackets connecting the anodes to the reinforced steel and finally filling the break out gap with underwater mortar. Six large anodes were also attached to the crane brace.

The final phase of the project for the divers was working on the steel knuckle from a man basket in mid-water. We welded twenty three 120 kilo anodes in place, repaired the sheet piles and welded patches on the damaged areas to make good ready for the new fender installation.

All documents were reviewed and audited by Halcrow, an independent global consultant.

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