Method and system for encasing an endless, laid pipeline conduit with backfill concrete

A method of encasing a pipe conduit (2), laid in a gallery (1) in continuous manner, with backfill concrete, with a working direction advancing in the axial direction of the gallery, said laying and encasing of said pipe conduit being carried out in working steps independent of each other, and said gallery including said pipe conduit being divided into sections of equal length, and an opening being provided at the pipe apex in each section for introducing the backfill concrete into a cavity between said pipe conduit and the wall of said gallery, characterized in that the backfill concrete is introduced into the opening into said cavity between said pipe conduit and said wall of the gallery in each section layer by layer, as a first filling layer such an amount of backfill concrete being introduced that in said section the buoyancy of the buoyancy force of said backfill concrete does particularly not exceed the weight of the pipe conduit, and after settling and hardening of the first filling layer a second filling layer for closing a settling gap and for securing adhesion forces between said pipe conduit and said backfill concrete is inserted, and after the respective stiffening of the backfill concrete the cavity between said pipe conduit and said wall of the gallery is substantially filled layer by layer, at least introducing the respective last layer being realised in sections in the working direction subsequently following each other, and that the openings of the filled sections are subsequently closed.