When after the indicating the startup, the fit convex section of the agitation axis of the agitation container this is made to touch to the fit concave section of the drive shaft of the adsorption section, the drive shaft turning, low speed both axes connect and through the agitation axis, the agitation wing starts turning at low speed. The vacuum pulling starts from inside the container attendant upon this, pneumatics inside the container start going down. Pressure detection value reaching to threshold P1, when the container it becomes a state where it is adsorbed into the adsorption section securely by vacuum, revolution of the agitation wing is stopped temporarily. Because of this, as for worker it can know the timing which is possible to release the hand. Furthermore when pneumatics inside the container go down to threshold P2 attendant upon vacuum absorption, revolution of the drive shaft is started, the mixed kneading harmony due to substantial agitation is started. After the degree of vacuum going down sufficiently, because agitation is started, the involvement of the air can lighten air bubble occurrence little. Because of this, as the air bubble which can be made in the mud of the buried material after the kneading harmony is made to decrease past compared to furthermore it is possible to improve operating efficiency.
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