Cutting edge structure, cutting edge damage confirmation method and cutting edge repair method

摘要

PROBLEM TO BE SOLVED: To provide a cutting edge structure, a method for verifying damage of a cutting edge and a method for repairing a cutting edge, which secure workability of drilling operation, and with which a repair work is easily carried out.SOLUTION: A cutting edge structure that is provided annularly along an outer periphery of the lower end of a caisson skeleton 10 comprises a concrete-made cutting edge main body 21 integrally provided in a bottom slab 12 of the caisson skeleton 10 and protruding downward from the outer peripheral edge of the bottom slab 12, and a cutting edge steel plate 22 covering at least a tip portion of the cutting edge main body 21 through the whole circumference. In the cutting edge steel plate 22, a through hole 22a that penetrates in a thickness direction is formed, communicating with the through hole 22a at the inner peripheral side of the cutting edge steel plate 22, and a valve 25 for opening/closing the through hole 22a is provided.SELECTED DRAWING: Figure 2