BEVELED EDGE PROTECTOR FOR STEEL PIPE IN PROPELLING CONSTRUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a beveled edge protector for a steel pipe, which is easy to handle and mount without damaging the beveled edge portion, if great propelling force is applied thereto. ;SOLUTION: A beveled edge protector has plural grooves 19 splitly provided in an abutted plate between the disc portion of a protecting cylinder and the beveled edge portion of a main pipe 100 in the circumferential direction, in which a metal pressure resisting plate 18 formed in a wedged shape with the face 18b in parallel to the inner periphery 100d of the beveled edge portion 100a of the main pipe 100 and the face 18a in parallel to the tapered face 100b of the beveled edge portion 100a is fitted. When propelling force is applied to the main pipe 100, the main pipe 100 is put in contact with the tapered face 18a of the pressure resisting plate 18 and then in additional contact therewith, so that both tapered faces, the tapered face 18a and the tapered face 100b, are slid and the pressure resisting plate 18 is moved to the radial outside of the main pipe 100 in the grooves 19 to prevent the deformation of the main pipe 100. A lubricant is applied to contact planes between the pressure resisting plate 18 and the beveled edge portion 100a and between the pressure plate 18 and each groove 19 for smooth sliding between the beveled edge portion 100a and the pressure plate 18, resulting in less damage to the beveled edge portion 100a.;COPYRIGHT: (C)1998,JPO