MACHINE JOINT FOR LONGITUDINAL JOINING DEVICE FOR PILE PROVIDED WITH LOOSENING PREVENTING MEANS

摘要

PROBLEM TO BE SOLVED: To prevent loosening of a set bolt in a machine joint for a longitudinal joining device for an on-site pile joining even when a vibration or an impact is given. SOLUTION: The longitudinal joining device is provided with a pin joint member 4 at one end of the on-site pile to be longitudinally jointed and also a box joint member 3 at the other end to which the pin joint member 4 is inserted. An upper steel pipe 1 and a lower steel pipe 2 are engaged with the pin joint member 4 and the box joint member 3 while both joint members 3,4 have groove strips on their joint surfaces at the places where the joint members are fit each other when engaging. The groove strips 8a of the box joint member 3 include engaging keys 12 which are screwed by bolts 11. Thus, after fitting the joint members, the engaging keys 12 are engaged and connected to the groove strips of the joint members with the bolts 11, and furthermore a loosening preventing means 13 of the bolt 11 is provided. COPYRIGHT: (C)2005,JPO&NCIPI