Disclosed is a joint for connecting first and second elongate members together end to end, the joint comprising: a first connecting structure and a second connecting structure at an opposed end of the second elongate member; one of the first and second connecting structures comprising at least one male connector unit having a longitudinally projecting male part which is tapered in the longitudinal direction; the other of the first and second connecting structures having at least one female connector unit defining a correspondingly tapered recess into which the male part is received; the other of the first and second connecting structures defining lateral locking pin holes aligned either side of the recess and the male part having a corresponding lateral locking pin hole; and a locking pin insertable through the corresponding locking pin holes.