Abstract: A displaceable platform which can be advanced sectionwise on a wall has support shoes (11) which are securable to the wall (12) at specific intervals in the direction of advance, at least two carrier rails (13) which are arranged spaced apart alongside one another and which extend along the wall (12) between at least two support shoes (11) in each case, and at least one displaceable bracket arrangement (14) which is arranged for displacement in the direction of advance and is fixable on at least two adjacent carrier rails (13), with the carrier rail (13) and the displaceable bracket arrangement (14) being alternately displaced upwardly.