Patent ID: 7210183

Claim:
A construction for building an expressway in the form of an elevated road, which elevated road extends, at least along a part of its length, above an existing motorway; said construction comprising: a mobile self-propelled, equipped with a control system, gantry of a tunnel shape; which gantry allows traffic of the existing motorway therethrough; the gantry's upper load-bearing working portion being arranged such that it allows that a part of a technological equipment be mounted and disposed thereon, the equipment being self-propelled and intended for erecting load-bearing supports, for placing girders on said load-bearing supports and for mounting an elevated road span structure above the gantry's upper load-bearing working surface; said gantry further having a lower supporting portion and a mechanism for changing height of the upper load-bearing working surface to compensate any deviation of the existing motorway support surface relief from the designed position of the elevated road span structure being mounted at a given place.