The flat jacks are primarily used in diagnostics of buildings and walls to determine experimentally what the static conditions of the structures under investigation are. The single jack test methodology is based on the variation of the tensional state in a point on the structure in question as a result of a cutting plan run in the normal direction at the surface. The release of injuries causes a closure of the cut, which it detects through a high-precision measurement of convergence. A special flat jack is then placed inside the cut and gradually pressurized with a special hydraulic pump until you cancel the previously measured convergence. From this pressure, annulling the deformations caused by cutting, you can derive the test agents in tensions in the area through the use of correction factors that take into account the shape and size of the jack and the cutting surface. To determine the characteristics of deformability, two jacks should be employed parallel to each other and installed at about 50 cm apart. Then the material they are composed by undergoes a test of compressive strength. The GESTECNO flat jacks are made with the sealed union of two special steel sheets, 0.8 mm thick in various shapes and sizes; moreover, they are individually tested for a 60 bar seal. The standard dimensions that can be supplied are: semi-oval 350x260x4, semi-circular 350x175x4 or 325x120x4, rectangular 400x200x4. On request, it is possible to supply special versions with shape, dimensions and seal according to the Customer's specifications. They are supplied complete with certification on production batch issued by accredited universities.