Caisson method and equipment for caisson method

摘要

PROBLEM TO BE SOLVED: To provide a caisson method capable of constructing an underground building on the ground and constructing a ground part in parallel with a basement part, and equipment for the caisson method.SOLUTION: The caisson method includes: a process of respectively erecting underground piled columns 3 composed by freely removably connecting a plurality of underground piled column nodes in an axial direction on cast-in-place piles 2; a process of constructing a basement part 51 on the ground; a process of installing jacks 4 between the upper ends of the respective underground piled columns 3 and a building 5, extending the jacks 4 and supporting the building 5; an excavation process of excavating the lower soil of the basement part 51; a settling process of simultaneously contracting the respective jacks 4 and settling the building 5; and an underground piled column node removal process of successively removing the underground piled column node whose order is predetermined among the uppermost underground piled column nodes of the respective underground piled columns 3 while supporting the building by the respective jacks 4 not corresponding to the underground piled column node. In parallel to the excavation process, the settling process and the underground piled column node removal process are alternately repeated until the basement part 51 of the building 5 is settled.