To provide a method by which the coke can be smoothly discharged even when plugging occurs during pushing and which comprises multiply dividing the coke in the direction of the height of the oven of a coking chamber and discharging the divided portions in order beginning at the highest portion.

The pusher ram head of a chamber-type coke oven is multiply divided in the direction of the height of the oven, and the divided portions are discharged in order beginning at the highest portion, whereupon the resistance of pushing a given portion decreases with a decreasing height of the portion to permit its smooth discharge. In a medium or low temperature coking operation and in a coal high-bulk- density operation, the resistance of pushing during coke discharge tends to increase, and the discharge work can not be smoothly done. The frictional force between the coke and the oven bottom brick is determined by the weight of the coke loaded on the friction producing surface on conditions that the frictional resistance is constant, and the frictional force between the coke and the oven wall brick is determined on conditions that the frictional coefficient is constant by the force of propagating the pushing force exerted on the friction producing surface to the oven wall through the coke. After the top coke portion is pushed, the lower coke portions are successively pushed in turn, therefore the weight decreases by degrees, the frictional force decreases, and the pushing resistance can be reduced.