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Contractors World  - UK & Ireland
2013 Vol 3 No 4
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Green from the ground up - page 3

 

During the erection of the turbines it is normal to employ heavy duty cranes.Crane Hard Standings.

During the erection of the turbines it is normal to employ heavy duty cranes.

These cranes require hard standing areas capable of withstanding the loads impose on the crane outriggers during the erection of the turbine.

The crane pads are approximately 40 x 20 m, and constructed adjacent to each tower. At the end of the erection period all crane pads will be covered with stockpiled topsoil which will be spread levelled, rotavated and seeded.

Good progress

The towers foundations are piled reinforced concrete bases with an insert anchor bolt system to connect the turbine tower to the base.

Reinforced concrete foundations for turbines are approximately 15 m x 15 m on plan and extending approximately 2.5 meters below the existing ground level. An estimated 600 cubic meters of concrete was imported to site to cast the foundations.

The turbines measure 125 m to the tip of the blades, with each generating capacity of 2 MW. One wind turbine can produce over 4.7 million units of electricity each year, enough to meet the annual needs of over 1,000 households.

“REG Windpower required a temporary track way solution that would allow the transportation of abnormal loads with gross vehicle weights of 120 tonnes, across peat with CBR’s of less than 0.5%,’ said Andrew Penfold, REG Windpower’s Construction Manager.

"The Emtek timber mats, supplied by Timbermat, were an excellent solution to our track way requirement; they had the advantage over conventional bog mats, as the system could be verified analytically with the engineering performance data provided by the mat’s manufacturer, before installing the track way on site. The mats exceeded the performance of conventional mats, and proved a viable, economical solution for possible use in the future for access requirements."

Timbermat’s ground protection mats are properly tested and certified, meeting new EU regulations.
Crawler cranes for tower erection.  The temporary track way was also tested with a 36 t excavator set up to exert point loads equating to +20 t axle loads, at the edges of the track.

For the two towers, the main crane was a Liebherr LG1750 with a transport weight 96 t and 12 t per axle. The other cranes were Grove GMK5130’s and Demag AC140 GVW up to 80 t with axle loads up to 16 t.. The 120 t GVW Nacelle was delivered on a Nooteboom Vessel Deck with 12 t axle loads.

Caring for the community

Not content with producing an environmentally friendly electricity supply to the local community, REG Windpower has also pledged to donate index-linked £16,000 every year of the wind farm’s expected 25 year lifetime, to help fund worthwhile projects in the host and neighbouring parishes.

Click here for more information
>>> Timbermat
>>> REG Windpower
>>> Liebherr
>>> Total Wind

 

 

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