ASHLARS FOR WIND TOWERS
The production of prefabricated hollow truncated conical ashlars, with variable diameters (2.80 - 7.50 m), with a height of approximately 4.00 m, takes place with the use of specific equipment for the assembly of circular reinforcements and metal formworks (platforms + sides) of various sizes. The production is completed in a covered area intended for the finishing of each ashlar, before storage in the external yards. For the production of the ashlars, mixtures of self-compacting concrete (S.C.C.) with resistance class up to C70/85 are used. The sheet metal sheaths are positioned in the thickness of the ashlar walls for the subsequent positioning of the prestressing cables, inserted from above during the tower assembly phase, which solidify the ashlars with the foundation cast on site. In the period 2007 - 2009, approximately 1,700 prefabricated ashlars were produced on behalf of the German company Enercon GmbH, intended for wind towers built both in Italy and abroad, with a total height of up to 100 metres.