PURPOSE: To facilitate a soil dumping process and to increase an amount of earth and sand loaded to a dump truck, by a method wherein earth and sand is conveyed from a site by a dump truck in a condition to knead a soil amending agent as cut earth and sand is discharged through a hopper.

CONSTITUTION: Cut earth and sand is conveyed into an earth and sand hopper 1, and is conveyed to a conveying device 8 combined with kneading function by means of an earth and sand conveyor 3 located to the lower end of the hopper 1. Meanwhile, a soil amending agent, such as cement, lime, is discharged to a despatch side of a screw conveyor of the conveying device 8 combined with kneading function by conveyor 16 situated to a lower end of a tank 7 wherein the soil amending agent is accumulated. This causes cut earth and sand to be discharged to a dump truck 22 through a discharge port 9a in a terminal of a casing 9 of the conveying device 8 as the cut earth and sand is mixed with the soil amending agent in the conveying device 8 combine with kneading function. Thus, the cut earth and sand is amended, which results in allowing them to be fully loaded onto the dump truck and in facilitating an earth and sand dumping process.