Abstract: Three elongate members such as rods or tubes forming mutually perpendicular uprights transoms and ledgers in a scaffolding structure are interconnected by engagement of a bracket carried at one end of a first (horizontal) member in a socket provided in a second (upright) member, a third horizontal member being engaged between the end and the second member and retained in position by a wedge element. The wedge element is jammed in position by tightening a clamping nut, and use may be made of standard pipes such as scaffolding tubes.