ADMIRAL LORD Nelson once described Milford Haven in south west Wales as one of the finest harbours in the world.
Pembrokeshire's natural deepwater harbour offers a non-tidal basin ideal for sheltering and berthing vessels from fi shing trawlers to natural gas tankers and from leisure yachts to cargo ships.
One thing it lacked, though, was securely attached floating pontoons and moorings; these were only fastened by anchor chains. So the Milford Docks Company called in Dawson WAM to prevent their natural drift by installing 36, 406mm diameter tubular steel piles up to 25m depth.
Designed by Atkins' and fabricated onsite by the client using reclaimed oil industry tube, the steel piles included a 3m bedrock socket.
Dawson WAM bored the piles into bedrock using a counter rotating cutting edge as well as conventional auger drilling. Piling was carried out from a barge, completing each pile with an internal concrete filling ferried over in a floating mixer.
The contractor began work on the £106,000 job in March and finished works in April.