zweischichtiges verschleiu00dffestes vergittertes knierohr for betontransport, comprehensive a to a certain extent gekru00fcmmtes auu00dfenrohr (4)in the auu00dfenrohr (4) a corresponding innenrohr (2) is arranged, which innenrohr (2) together with the auu00dfenrohr (4) to a fu00fcllraum forms in which a filling material (5) is arranged.with both ends of the auu00dfenrohrs (4) each have a flange (1) is arranged on the inner wall of a verschlussstu00fcck (6) is attached.with the two ends of the innenrohrs (2) according to the assigned verschlussstu00fcck (6) concerns, characterizedthat on the outside surface of the innenrohrs (2) members reinforcing (3) are arranged which members reinforcing (3) lattice (8) formon one side of the innenrohrs (3) several only (7) are arranged.and that the bars (8) at different points of the innenrohrs (2) different wall thicknesses of the rohrku00f6rpers are allocated.
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