To efficiently and safely perform parallel working by clearing the procedure of construction and avoiding the overlapping work of building construction work and refuse disposal facility installing work.

An underground part precedes an underground building construction work process, the refuse disposal facility is installed in the underground part, and installed after the underground building construction work process. A refuse disposal facility support frame 6 and refuse disposal facilities (7, 8, 9, 10, 11, 12, 13, 14) are installed by a self-travelling crane 5 keeping pace while performing execution by preceding the refuse pit part to the underground part. Next, the shed of the part of a refuse pit 1 is executed after the completion of the building frame work of the refuse pit part, and a refuse crane 7 is installed therebetween. Next, after the refuse disposal facility support frame 6 and the refuse disposal facility are installed, the part executes the shed, and a lightweight instrument, a duct, piping and the like are carried in by passing them between beams after shed building frame execution. Finally, a platform 17 is executed.