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in the removal of the ex i st ing and installation/commissioning of the new one over a single weekend possession.” The ferry service between Gosport and Portsmouth was operated from nearby Endeavour Quay dur ing the changeover period.

Instal lation of new pi les into the harbour bed was ass i sted by loca l company Baker Trayte Marine, which supplied the foatng plant. The former pontoon, which sufered age fatgue, was foated away for recycling before the new one was lifed into place.

It is the second major shoreside project Trant has been involved with recently, having refurbished many of the listed building structures of Ryde Pieron the Isle of Wight.

Shorflo ensures deep piles are pumped clean

Two four-inch Super-Silent diesel pumps from Shorflo, the pump hire division of construction services specialist, Groundforce, have helped during the piling for a new terminal for the Gosport to Portsmouth ferry in Hampshire. Contractor Trant Constructon hired the two “Shorfo Super” pumps to de-water the three large tubular steel piles which will secure and stabilise the terminal’s new foatng pontoon which is designed to ride up and down the piles so that it can rise and fall with the tdes running in the Solent.

The piles, each 610 mm in diameter and more than 30 m in length, were driven approximately 28 m into the sand and underlying clay of Portsmouth harbour before being flled with concrete to provide solid supports for the pontoon. “Before pouring the concrete, we frst had to pump out the silt and seawater from inside them,” explains site manager Mark Blackler. “We chose Shorfo because we’ve used them before and they are a reliable company who supply good pumps.”

Shorfo’s Super-Silent Betsy pumps are built around the Hidrostal screw centrifugal impeller which is renowned for its operatng efciency and its ability to handle a range of materials. With a maximum capacity of 172 m³/hr the four-inch D100 model is exceptonally fuel efcient, consuming only 1.1 litre/hr when pumping fat-out.

At Gosport, the two pumps were supplied over two days and mounted on a barge so they could reach the piles located a few metres beyond the quay. One fooded the pile and one pumped out the sand and silt, discharging into

t wo temporary setlement tanks mounted on the quayside. Here the silt was separated from the water w hich was then pumped back into the harbour.

The new £5 million terminal replaces the original foatng pier which had reached the end of its

service life. With an estimated 3.6 million passengers using the facility every year, the client, Gosport Borough Council, ordered the new terminal to ensure it could cope with the steadily increasing passenger throughput.

For more informaton: • Shorfo Pumps

• Trant Constructon

Page 15 Contractors World - UK & Ireland Vol 1 No 5

Shorfo pumps provided the reliability and the capacity to cope with the challenging task in dewatering piles at the Gosport ferry terminal

Photographic sequence showing the challenges in manoeuvring into positon the large replacement units at Gosport Ferry Terminal © Gosport Borough Council

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