Flat Jacks

The Freyssinet flat jack is a thin, hydraulic device, capable of developing considerable forces in a simple and economic manner.

Initally designed by Eugene Freyssinet as a way of prestressing concrete, to be used under specific circumstances, flat jacks were used for numerous applications, in particular to apply or transmit forces while counterbalancing the relevant strains.

The Freyssinet flat jack is a malleable steel capsule made up of two steel-welded together, the connection being in the shape of a cylindral or toric rim. Two adjutages tubes, one of which serves as a vent, allow fluid to be injected under pressure which pushes aside the two faces of the jack while the strain incurred modifies the shape of the rim.

Further information about Flat Jacks can be found in our brochures.