Contractors World


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Contractors World UK & Ireland
2012 Vol 2 No 3   
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Scrabster Harbour being developedScrabster Harbour being developed

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Scotland

Scrabster Harbour being developed

An increasing number of ports around the UK are spending large sums to improve their respective facilities and to cater for larger ships. One of these ports is Scrabster, located near Thurso in the extreme north coast of Scotland, which plays an important role for the Scottish fishing industry and a ferry service link to Orkney.

Glasgow-based civil engineering company, RJ McLeod (Contractors), won the £16.9 million contract to redevelop the Old Fish Pier within the inner harbour on behalf of the Scrabster Harbour Trust.

The company began preliminary work on the 12 month project in August 2011 which involved the demolition and stockpiling of excavated concrete and rock for on-site recycling and to minimise importing material from a quarry source.

The Kobelco cranes, a CKE2500 and a CKE1800 with lift capacities of 250 t and 180 t respectively, were positioned on the quay and worked over the water to install two pile walls    Scrabster’s redevelopment project involves extensive piling, valued at £3.4 million, which was -undertaken by Counterthrust piling contractor Steel Pile Installations (SPI) and due to be completed in January 2012.

To prepare the piles for driving, SPI constructed a piling gate which accommodated up to six combination piles at a time and can be turned around in four and five days. This enabled piling hammers to drive each pile without any delay in having to place piles individually. To drive the piles, SPI hired-in two Kobelco crawler cranes, including operators, together with three BSP impact piling hammers and three PTC Vibrodriver hammers, all from BPH Equipment.

The Kobelco cranes, a CKE2500 and a CKE1800 with lift capacities of 250 t and 180 t respectively, were positioned on the quay and worked over the water to install two pile walls. One of the walls was constructed using sheet piles while the combination wall was formed using 1.22 m tubular steel piles and AZ sheet pile infills.

Piles required for the combination wall comprised 72 tubular piles, 35 m long and 1.22 m in diameter together with 72.5 pairs of AZ26-700 sheet piles up to 16.5 m length. To form the inner harbour wall 92.5 pairs of AZ28-700 sheet piles, 18 m long and 11 tubular steel bearing piles with a diameter of 1.22 m measuring between 25 m and 28 m in length. A further eight 660 mm diameter tubular steel piles some 33 m long were also required. The piles were driven 15 m into the seabed which comprises stiff to very stiff clay interspersed with cobbles.

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Page updated: March / April 2012

 

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