Bochumer Eisenhütte Heintzmann Gmbh&co. Kg

Bochumer Eisenhutte Heintzmann & Company

Rudolf Seiz

Rudi Podjadtke

Dieter Steppke

Heinz Eickhoff

Herbert Meyer

A lattice girder supporting frame for tunnel lining includes upper and lower boom members arranged parallel to each other to form a triangle. Truss braces spatially connect the upper and lower boom members to each other, wherein each of the truss braces has straight brace parts angled relative to each other, and each of the straight brace parts is connected to each other at one end via a straight bridge piece. The truss braces are arranged in a symmetrical plane extending laterally from the upper boom member to an axis of the lower boom members. Cross ties extend at right angles relative to the lower boom members, for connecting the lower boom members to each other, wherein the truss braces abut the lower boom members without bending and are welded to the lower boom members.

Lattice girder supporting frame having straight brace parts

A door-like closure for passageways in high-risk high-security installations includes a multilayer protective plate which has a rather high resistance to mechanical, thermal and chemical damaging influences, but which can be rather easily damaged by the action of explosives. To reinforce the protective plate, a reinforcing grid is juxtaposed therewith at the major surface thereof which faces the interior of the installation so that, when an attempt is made to destroy the protective plate by explosives, the reinforcing grid not only will increase the resistance of the protective plate to damage but also will permit the explosive shockwave and the possible debris of the protective plate propelled thereby to penetrate through the apertures of the grid without causing any considerable damage to the grid. The apertures of the grid have such dimensions that an intruder will not be able to reach through the aperture into the interior of the installation to, for instance, manipulate the lock of the closure. The grid may consist of a plurality of grid elements of polygonal cross sections which intersect each other at right angles in two sets and in one or two layers, being connected to each other between the two sets. However, the reinforcing grid may be a homogeneous reinforcing plate formed with the apertures. A plurality of passages may be provided in the protective plate, extending substantially parallel to the plane of the protective plate and serving to divert the flow of the effects of the explosion from normal to the plane of the protective plate to substantially parallel thereto. A contact mesh may be incorporated in the protective plate and generate a signal when the latter is damaged or otherwise tampered with.

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Herrsching, Germany

Rudolf Seiz