Pearl River Delta, South China Sea /PRWeb/-- 72' piles, driven with American Piledriving Equipment's giant eight-hammer piledriver called The Octakong, for the Hong Kong-Zhuhai-Macau Seaway project, are the largest piles ever driven. These 72' diameter steel piles, and the equipment that install them, enable an acceleration in cofferdam and seawall construction that paves the way for land reclamation and sea-bound construction across the globe.
The two enclosed sea-bound walls are to form bulkheads for two artificial islands under construction for the Hong Kong-Zhuhai-Macau Seaway project due to be finished 2016.
The two islands will form transition structures between the project’s 4.2 mile tunnel section, built to allow deep water ship access to the Pearl River Delta from the South China Sea, and three cable-stayed bridge spans linking Hong Kong in the east to Macau and the mainland Chinese city of Zhuhai to the west.
The artificial islands’ seawalls each comprise 60 individual adjoining cells, each adjoined by wingwalls, in order to form to perimeter of the island. Traditional construction methods of the bulkheads would have taken years, with each cell having to be fabricated individually by driving one interlocking sheet pile at a time to form each cell, and each cell constructed to adjoin the next until the island wall perimeter was closed. A construction method driving the cells as individual massive steel piles had never been tried on this scale in these conditions. The pile driving equipment capable to supply the force to drive the piles was conceived of, but not yet constructed.
Allnamics Pile Testing Experts of the Netherlands helped convince Chinese contractor First Harbor Marine Group China that a massive multi-vibrohammer can be used to drive 130' long, 72' diameter steel pipe piles weighing 600 metric tons each into the sea bed of the South China Sea to the required depth.
By using the innovative Octakong pile driver to drive the 72' diameter piles, the construction schedule was reduced to less than 7 months.
Specially designed, engineered and manufactured for the project by American Piledriving Equipment, Inc. (APE) of Kent, Washington, the Octakong consists of eight synchronized vibratory pile drivers powered by eight CAT 1200 HP engines in order to drive each 72' steel pile, saving an immense amount of time.
Commenting on the project, APE President, John White said “The completion of the circumference of each island’s wall marks major advancements in the field of sea-bound construction, land reclamation technology and pile driving – at 72’ these are the largest diameter steel piles ever installed.”