PURPOSE: To eliminate that storehouse for large-sized aggregate, which is more larger than it is required by a method wherein an operation result of a door opening time of a drawing gate of the aggregate corresponding to supply capac ity is sent as signaling instructions to the drawing gate of the aggregate and operation instructions to an aggregate conveyor and an aggregate distributing turning head.

CONSTITUTION: When, for example, a capacity level value sent from an aggregate level sensor 1a of an aggregate storage tank 1 is reduced down to the capacity level value which is more than an aggregate quantity loaded on aggregate conveyors 6, 7, the central operating device 10 operates supply capacity through the reduced capacity level value and a preestablished fully-filled quantity value. Then based on this operation result, a door opening time of a drawing gate 1c of the aggregate corresponding to a supply quantity of the aggregate is operated, a result of which is sent as door opening instructions of the drawing gate 1c of the aggregate, driving instructions to an aggregate drawing belt conveyor 6 and batcher feed tilting conveyor 7 and further rotary movement instructions to an aggregate distributing turning head 8 and supply of the aggregate is started.