Control of vertical pressure
The total pressure sensors are used to measure the total pressure of the soil, installed in the soil thickness in the range of the estimated compressible strata. A total pressure sensor consists of a sealed distributed cushion, which itself consists of two plates welded at the perimeter: pillow filled with oil and connected with strain gauge metal tube. Changing the oil pressure, the sum of the load changes on the pillow, is registered by the sensor.
Before installation of the sensors in the soft ground excavation pits to a depth of installation are carried out. Sensors are getting gently pressed into the wall of the pit and the wires through the metal tube are displayed on the surface. Frequency of measurements of total pressure generally depends on various factors (from 1 hour to 1 month) and set work program.