| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutter head for reconstruction jacking method of an existing embedded pipe, capable of breaking a metallic collar while cutting it even if the existing embedded pipe is an existing embedded pipe constituted of vinyl chloride pipes connected with each other by metallic collars.SOLUTION: A cutter head for reconstruction jacking method of an existing embedded pipe includes: a face plate 18 rotating around an axial line of a leading pipe; first rows of cutters 20A, 20C consisting of bit cutters having carbide tip cutting blades, with the cutting blades extending in the radial direction of the face plate; and second rows of cutters 20B, 20D consisting of composite cutters having blade parts to which cemented carbide pieces or grains are welded, with the blade parts extending in the radial direction of the face plate. The first rows of cutters 20A, 20C and the second rows of cutters 20B, 20D are alternately disposed in the circumferential direction of the face plate 18. |
