Development of new type of U joint applied in spun pile

Direct weld applied in end plate of 800mm PHC spun pile is disadvantage with the poor soldering quality,shortage of quality measurement and negatively big impact on thermoplastic concrete zone caused by high temperature during welding.The bowl weld can improve the above-mentioned defects though applied ring plates suffer low flexibility that should be aligned with spun pile itself.In comparison,this paper introduces a new weld jointing that competes over the above two jointing in terms of motioned shortcomings.Furthermore,the optimized parameters of jointing accessories are theoretically calculated.In practice,with a wide range of applications,it is proved that the newly developed jointing obviously outperforms the existing technologies.