Optimal type of pile joint in consideration of main characteristics

Pile foundations are generally used in soft ground conditions, and in high-rise construction it is necessary to use precast piles with length more than 12 meters. There are a lot of pile joint types and it is difficult to define which one is optimal. In this article welded, bolted, socket and pin types of joints are described. With next characteristics: economic efficiency, service life, working hours and number of workers comparison is conducted. It was based on method of multi-criteria alternatives. In conclusion approvedthat pin type joint is optimal.