The Total Pressure Cells consist of a sealed distribution pad, composed of two plates welded together around the periphery and filled with de-aired oil.
The TPC cells consist of a sealed distribution pad, composed of two plates welded together around the periphery and filled with de-aired oil. The pad is connected via a length of steel tube to a pressure transducer. Variation in oil pressure resulting from load changes acting on the pad are sensed by the transducer.
The TPC is fitted with a circular or rectangular pad, the latter being designed for measurement or tangential and radial stresses in shortcrete tunnel linings. The stiffness of the TPC is high, enabling its embedment in soil or in concrete. A groove on both sides of the pad increases its flexibility while reducing sensitivity to stress in directions other than normal to the pad face. The concrete stress cell may be fitted with a repressurization tube to restore contact between the pad and the concrete after curing of the latter.
The TPC is fitted with eyelets, to simplify installation, and with a built-in thermistor allowing temperature reading.