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NATM Stress Cells

Reference products codes: L112R, L112T, C6002

Sisgeo flexible diaphragm NATM stress cells have been designed to optimise measurements of radial and tangential stresses in shotcrete and concrete tunnel lining.

The stress cell consists of a pressure pad connected to the transducer by hydraulic line. The internal cavity between the two steel plates of the pressure pad and the hydraulic line are filled at laboratory with special oil deaired under high vacuum to obtain the minimum oil compressibility.

The rigidity of the cell is even assured by the transducer which has a ceramic diaphragm with negligible volume displacement in comparison with the cell cavity.