To prevent the formation of a soil mixture not meeting the conditions of a moisture content in the case several kinds of soils or granular substances are mixed to make the mixture soil having the suitable moisture content by measuring the moisture content of the soil or granular substances in a stage before mixing to give an alarm when the measured value is not less than or not more than a prescribed value.
In the case A soil 1 and B soil 2 and concrete scraps 3 are mixed, these are conveyed by conveyors 4-6 to a hopper of mixing equipment 7 respectively. At this time, in the middle of the conveyors 4, 5, measuring devices 8, 9 for measuring the moisture content are installed, but a measuring device is not installed in the conveyor 6. Signals from the measuring devices 8, 9 are sent to a computer 10. To this computer 10, the mixing ratio of the soil or the like and the moisture content range of the soil mixture are inputted, and the calculated moisture content is obtained from the mixing ratio and the measured value for every measurement. And it is compared with the prescribed moisture content range of the soil mixture, and when the calculated moisture content deviates from the moisture content range, an alarm is given from an alarm device 11.
KOTO ATSUSHI
SUZUKI KAZUYUKI
KATAYAMA YOSHINOBU
TAKEUCHI ISAO
KOTOO KK
KANSAI DOBOKU GIJUTSU CT KK