SHAFT CONSTRUCTION METHOD

PROBLEM TO BE SOLVED: To provide a shaft construction method capable of installing pile materials in a substantially upright attitude in a building-up position of an excavation pit, and making a specific shape area allowing passing of a shield machine between the pile materials. SOLUTION: This shaft construction method comprises a pile material building-up process of building up the first and second pile materials 11 and 12 in the excavation pit 41 in a state of tensioning a first steel wire 14 in a part 33 between members, a first pile material pulling-up process of separating end parts 19 and 20 of the first pile material 12 and the second pile material 12 by a predetermined dimension in the vertical direction by pulling the first pile material 11 upward in the vertical direction, by pulling out the first steel wire 14 from the excavation pit 41, by separating the first steel wire 14 from a second support member 17, while supporting a second steel wire 15 on the ground, and a second steel wire pulling-out process of pulling out the second steel wire 15 from the excavation pit 41 by separating the second steel wire 15 from a third support member 18 after curing soil mortar 42. COPYRIGHT: (C)2009,JPO&INPIT