Contractors World


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Contractors World UK & Ireland
2012 Vol 2 No 3   
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Scotland: Scrabster Harbour being developed - Page 2 of 2 >>>

Each hammer required its own BSP power pack. one HP250 for the CG300 and two HP125S units to power the CX110 and CX85. In the operation, the BSP hammers, a CG300, a CX110 and a CX85, were used in crane suspended configuration.

In the operation, the BSP hammers, a CG300, a CX110 and a CX85, were used in crane suspended configuration. Each hammer required its own BSP power pack. one HP250 for the CG300 and two HP125S units to power the CX110 and CX85.

The three PTC vibrating hammers, a 23HFV, a 65HDR and a 52HVR also used their own individual power packs. Both cranes were positioned on the combination wall with the piles placed in a gate and driven initially by the vibrating hammers. The BSP hammers were then used to backdrive the tubular steel piles and infill sheet piles to the required depth.

BSP’s heavy-duty CG300 was fitted with a 20 t ramweight mass and is designed for driving a variety of piles including steel tube, combi piles, H-section as well as reinforced, pre-stressed concrete piles.     BSP’s heavy-duty CG300 was fitted with a 20 t ramweight mass and is designed for driving a variety of piles including steel tube, combi piles, H-section as well as reinforced, pre-stressed concrete piles. It can be operated from piling rig leaders or crane suspended.

The mid-range CX85 was equipped with 5 t ramweight and is suitable for driving bearing and sheet piles. It is available with legs and inserts or pile guides for freely suspended use or with back guides for operating from a leader rig.

With a ramweight of 9 t, the CX110 is the largest model in the BSP mid-range and offers a maximum impact energy of 106 kN and a blow rate of up to 36 bpm.

During the piling phase of the contract, the hammers were restricted to working between 8 am until 8 pm Monday to Saturday. Dave Gardner, SPI contracts manager in Scotland, says: “Driving of the combi piles went according to plan however the infill sheet piles to form the SSP wall proved more difficult as occasional boulder obstruction impeded progress. Pile driving was continuous but progress was dependant on the stages of the gates with around two days driving in each gate cycle. A piling gate containing six combi tube piles was turned around in four to six days.“

When the project is completed, Scrabster harbour will have 330 m of new quay, an 11,573 m² of quay side and supporting lay down area, plus a deep water approach channel 7.5 m depth throughout the tidal cycle, which will enable the largest offshore vessels to access the harbour. In addition, vessels can enter the harbour at any tide and without delays that can often occur at other ports around the UK.

Click here for more information >>>
>>> RJ McLeod (Contractors)
>>> BSP Hammers
>>> BPH Equipment
>>> Kobelco Cranes

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Page updated: March / April 2012

 

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