Patents by Inventor Helmut Pfeil

Helmut Pfeil has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5324139
    Abstract: A new combination of means and method steps is used in a method of constructing long tunnels with a lining, wherein excavation is effected with a tunnel boring machine (1) with a yielding shield mantle (4), building is effected continuously under the protection of the shield tail in a modular construction with tubbing stones of a special form complementing each other to form tubbing rings (15) while, until a new equilibrium of the rock formation is reached, occurring deformation forces are absorbed by the shield tail (4) and the tubbing rings which are yieldingly constructed to a limited degree, an outer seal of the tubes is provided and the gap between the excavation (2) and the tunnel tubes is filled with a material (22) which may be yielding to a limited extent to absorb long-time deformation forces. A tunnel construction made by the method, special forms of tubbing stones and new embodiments of drive means for the tunnel are disclosed.
    Type: Grant
    Filed: February 18, 1993
    Date of Patent: June 28, 1994
    Assignees: Ingenieure Mayreder, Kraus & Co. Consult Gesellschaft m.b.H., Tunnel Aktiengesellschaft Tunnel Planungs-, Errichtungs- und Betriebs-Aktiengsellschaft
    Inventors: Harald Wagner, Alfred Schulter, Helmut Pfeil, Otto Schubert