PURPOSE: To substantially simultaneously and automatically advance the construction of a side wall for improving constructing ability by automatically distributing concrete into a mold, placing and compacting it, and comprehending the placed state of the concrete.

CONSTITUTION: The circumference of a concrete side wall 2 is divided into four, and a concrete mold is constructed for each side wall 4, and concrete fed from a supply section 5 is distributed through a valve 7 in a piping 6 and placed. Next, in each divided side wall 4, the placed concrete is densely compacted by a vibrator as it is moved, and its placed state is comprehended through a monitoring system. In this case, the placed state-of the concrete is watched by a watching monitor, and a planned and an actual quantity of the placed concrete are supervised every placing time by the watching monitor. Thus, each work for distributing, placing and compacting the concrete is automatized, and the placing quantity, the side pressure of the mold and preparation for the supply of a ready-mixed concrete car can correspond promptly to each working place.