UNDERGROUND EXCUVATION PILE CONSTRUCTION METHOD USING PERCUSSION ROTARY DRILL

摘要

PURPOSE: A piling method for excavating inside is provided to precisely keep the perpendicularity of a center pile, and to secure a traffic line of equipment by installing an outer casing of a concrete material. CONSTITUTION: A piling method for excavating inside is as follows. The position of a first guide casing is measured, and excavation is performed. The first guide casing is inserted, and an outer casing(4) is installed by placing concrete around the first guide casing. Drilling is performed, and a second guide casing(8) is inserted at the same time. Footing concrete is placed in the drilled part, and a center pile(12) is inserted. A steel guide is formed in the top end of the second guide casing. The steel guide fixes the center pile, and concrete is placed. The second guide casing is drawn out.