Installation arrangement with jack-up rig and a barge and a method for setting up the installation arrangement

An installation arrangement with a barge (2) and a jack-up rig (1) which floats in a first position on the sea and has a hull (7) which is slotted vertically with respect to the surface (17) of the sea and has a slot width which is greater than a width (BB) of the barge (2) so that the barge (2) can move into a slot (6), wherein the jack-up rig (1) has supporting legs (9a, 9b, 9c, 9d) which can move up and down relative to the hull (7) along a height (H) of the hull (7) and can be set down on the seabed, and the hull (7) can be lifted, together with the barge (2) which has moved in, out of the water into a raised position by means of a lifting mechanism along the support legs (9a, 9b, 9c, 9d) which have been set down on the seabed, characterised in that the slot (6) extends along the entire longitudinal extent of the barge (2) which has moved in, over the entire height (H) of the hull (7), and that securing means (13a, 13b, 16a, 16b) are arranged on the barge (2) and on the slot (6) and said securing means (13a, 13b, 16a, 16b) interact and secure the barge (2) in the raised position in a fixed position on the jack-up rig (1).