The tensioning jacks are available in version TTM – M – DD – DX.
The jacks TTM type are used for tensioning the strands and are available in three different models depending on the characteristics of use. They are provided with an automatic locking circuit and 4 meter long flexible tubes. The main use of jacks is for tensioning on single strand heads on TTM anchorages. They are available with strokes: 400 mm., 200 mm., 100 mm. and 60 mm., the stroke reduction allows smaller dimensions of the jack.
The M series of jacks is available in nine models which differ according to use characteristics. They are provided with an automatic locking circuit and 10 metre long flexible tubes; they are also equipped with a device rotating on an axis, restricted tensioning extension, and low operating pressure. The jacks are equipped with a metal support, designed in particular to achieve the required inclinations during tensioning operations.
The support is integral with two bearings which enable the jack to turn on its axis, facilitating insertion of the strands protruding from the head. The restricted tensioning extension, the rotation of the jack on its axis and the support allow quick operations and a limited effort during handling.
The DD series of jacks is available in four models which differ according to use characteristics. They are equipped with 10 m long flexible tubes and spanners of different sizes for all the types of bars from 26.5mm to 50mm. They are set up for automatic tightening. When the special spanner is inserted in the jack, the nut can be tightened keeping the bar under tension. This avoids the use of settings and manual tightening operations.
The jacks DX series are used for tensioning bars without tightening and are used for tensioning on dressed stones where the nut is manually screwed through its entire minimum length.