Pile joint

A pile joint, which comprises a first concrete pile, a second concrete pile, and a coupling system therebetween for connecting and locking the first and the second concrete pile relative to each other, or which comprises a concrete pile, a rock point, and a coupling system therebetween for connecting and locking the concrete pile and the rock point relative to each other, said coupling system including a lock housing and a lock spindle connectible to each other, said lock housing and lock spindle being provided with transverse holes in such a way that the lock housing's transverse holes and the lock spindle's transverse hole settle substantially in line with each other for receiving a locking pin when the lock housing and the lock spindle are connected to each other, the lock housing being provided with a locking ring for retaining the locking pin in a position locking the lock housing and the lock spindle to each other, wherein in alignment with a first transverse hole of the lock housing is a guidance pipe and in alignment with a second transverse hole of the lock housing, opposite to its first hole, is a locking seat closed at one end and intended for the locking ring, the locking ring is adapted to be movable in a groove included in the locking seat, and wherein the locking pin is provided with a recess in a lengthwise direction of the locking pin for receiving the locking ring, and wherein the locking ring, once struck into the locking groove, is permanently disposed within the locking seat.