Piling specialist Aarsleff Piling has invested in a new piling rig to drive the larger and longer piles required to resist cyclical loads from wind turbines.
The rig is a Finnish Junttan PM26 LC, complete with a 9t Junttan accelerated hammer with maximum impact energy of 106kNm at full 1.2m stroke.
The first project for the PM26LC is for two Fenpower turbines at Ransonmoor near March, Cambridgeshire. Here, Aarselff Piling is installing 350mm square piles 26m long for contractor RG Carter Civil Engineering which is working under a £790,000 contract with Fenpower.
Arsleff's subcontract is worth £85,000 and the foundations are designed by German consultant HCE Ingenieurgesellschaft. "We have already installed foundation piles for over 50 wind turbine bases and by the end of this year we expect to have installed piles for another 44," says Aarsleff Piling managing director Terry Bolsher.
"The 9t hammer is one of a new generation of Junttan hydraulic impact hammers. It is operated from the rig's hydraulic system and hydraulically accelerates the drop weight during the fall. This has the effect of boosting the impact energy and increasing the efficiency at full stroke over a conventional free fall drop hammer of the same weight by up to 20%," he adds.