MODERNIZATION OF THE CLASSICAL SCHEME OF THE HANDICRAFT MANUFACTURE OF SOIL PRESSURE SENSORS

This article is devoted to the modernization of handicrafts manufactured to measure the stress in the ground (messdose). Today, when designing buildings and structures, an important task is to determine the amount of expected precipitation. The calculated values are not always objective, especially in the conditions of Western Siberia, where weak organic-mineral soils are common. Based on the experience of the introduction of sensors measuring the voltage in the ground, the author identified a number of factors by which they most likely fail. According to approximate calculations, until the end of the average natural experiment, about 25% of the messdose remain operable. The author proposed options for upgrading sensors to minimize the risks of their failure. The main causes of sensor failure: contact breakdown, depressurization, short circuit. They are eliminated by inserting fiberglass boards and two-stage sealing into the sensor body. The body of the sensors was made of titanium. Cyanoacrylate glue was used for sticking the strain gauges onto the body of the messdose. Sealing was performed with epoxy resin. As a signal cable used 4- core cable KSPV. Calibration of the sensors was carried out in an aerostatic tank. Upgraded sensors were tested during a laboratory experiment. The author tested a sample of weak organic soil in compression conditions. No total pressure sensor has failed. The convergence of the sensor readings with the load applied to the sample is very high. The measurement error did not exceed 10%. The author also attempted to make handicraft sensors to measure pore pressures in the ground, but during the implementation they all failed