CONSTRUCTION METHOD OF VERTICAL SHAFT

PURPOSE:To solve all problems such as curtailment of construction period necessary for a great depth vertical shaft, reduction of cost, measure for high water pressure, etc., and to make it possible to safely and easily cope even with a vertical shaft having a larger diameter without causing problem such as transportation, etc. CONSTITUTION:Sludge is excavated by a reverse circulation drill machine 24 to form a trench hole 18 in the ground 10. A manufacturing yard 2 of a setting structural body 40 connected to the trench hole 18 is excavated and formed in the side of an inlet port of the trench hole 18. Sludge in the manufacturing yard 2 is discharged, and concrete is placed in the manufacturing yard 2 to manufacture the settling structural body 40. Water is injected in the manufacturing yard 2, the settling structural body 40 is moved to the trench hole 18 side from the inside of the manufacturing yard 2 in the water to settle it in the trench hole 18. A manufacturing process and a settling process of the settling structural body 40 are repeated to connect one settling structural body 40 to the other settling structural body 40 in the trench hole 18. A gap between the peripheral surface of the connected settling structural body 40 and a hole wall of the trench hole 18 is solidified.