To cut and remove steel-pipe piles by simple temporary construction without damaging peripheral structures by forming a vertical cutting-plane line by a vertical cutting disk and a horizontal cutting-plane line by a horizontal cutting disk and attracting steel-pipe pieces after cutting by an electromagnet and recovering the steel- pipe pieces in a method, in which the steel-pipe piles are cut from the inside.
The equipment is composed of a vertical cutting device A, a horizontal cutting device and an electromagnet. The vertical cutting device A is hung down into a steel pipe, a reaction device 14 is extended and fixed, a vertical cutting disk 21 is brought into contact with an internal surface, the vertical cutting disk 21 is moved vertically by the expansion and contraction of a jack 24, and the cutting-plane line of a perpendicular is formed. The horizontal cutting device is hung down, a place is fixed by the reaction device, a horizontal cutting disk is brought into contact with the internal surface, and a horizontal slit is formed by rotating the disk. A vertical shaft is rotated by a driving section under the state, and a horizontal cutting-plane line is shaped. Cut pieces are recovered by attracting the cut pieces by the electromagnet hung down into the steel pipe and discharging the cut pieces. Accordingly, the steel-pipe pile can be cut and removed without damaging peripheral structures.
KOBAYASHI KEIICHI
TAZAKI SHINICHI
ISHIKAWA AKIFUMI
SHOEI CO LTD