| 摘要 |
PURPOSE:To enhance the management of excavation by providing a density and moisture measuring unit for dug earth, to an excavator, and by providing a density and moisture measuring unit for discharged earth and a unit for measuring a flow rate of discharged earth, to an earth discharging pipe in an earth discharging device in order to make the digging volume of earth equal to the discharge volume thereof. CONSTITUTION:A density and moisture measuring unit 31a using radio-isotope is provided to a spoke 9 in an excavator 3 so as to detect the density and moisture ratio of dug earth from the ground, from which a particle weight WS1 of the dug earth is calculated. Further, a density and moisture measuring unit 31c is provided in an earth discharging pipe 17 in an earth discharging device 8 so as to detect the density and moisture of discharged earth, from which a particle weight WS2 of the discharge earth is calculated. Then, measurement is made additionally by an additive flow meter so as to calculate a particle weight WB of additive. Thus, the rotational speed of the earth discharging device 8 and the advancing speed of a shield jack are suitably adjusted so as to satisfy WS2 = WB + WS1. Thereby it is possible to optimally manage the volume of discharged earth. |
