FPT – Fluid Power Technology – over the years has developed experience and expertise in various fields of industrial and civil engineering. Historically the hollow hydraulic cylinders were born for the extraction of pins. The same devices have proven to be essential for stressing some bars specifically designed for civil purposes.
For the same bars are available ranges of FPT hydraulic tensioners that allow to reduce to the minimum axial distances of installation and extra lengths for stressing the bars.
The bars mentioned above are usually known as Dywidag. Dywidag® is the trade name of a product developed in Germany by the company named in the past as Dywidag (today DSI acronyms of Dywidag System International).
The Dywidag bars correspond to the class Y1050 in the catalogue SAS and identify the product with the higher resistance values (yeld strength fp0,1k= 950 N/mm2, tensile strength fpk= 1050 N/mm2), over the mentioned bars there are other bars ranges with lower resistance values that cover different applications, the most common ones are:
Bars B500 (corresponding to DSI “Gewi”): yeld strength fp0,2k= 500 N/mm2, tensile strength fpk= 550 N/mm2
Bars S670 (corresponding to DSI “Gewi Plus”): yeld strength fp0,2k= 670 N/mm2, tensile strength fpk= 800 N/mm2
Bars for formworks: yeld strength fp0,2k= from 750 to 950 N/mm2, tensile strength fpk= from 875 to 1100 N/mm2