Dyckerhoff & Widmann Aktiengesellschaft

Reinhard Klockner

Hans-Peter Von Allmen

Dieter Jungwirth

Thomas Herbst

Otmar Langwadt

Gero Herrmann

Erich Richartz

Engelbert Gott

Franz Ruckdeschel

A method of producing an intended breaking point at a predetermined location of a tension member for a soil anchor of a strain-hardened steel or a steel which is not which is not in a thermodynamic equilibrium, for example, a wire or a steel wire strand, to enable removal of the free steel length after use by applying a tensile force which exceeds the working load. The predetermined breaking point is obtained by heating the tension member at a predetermined location in a controlled manner to a temperature at which the state of strain-hardening or the state of being not in a thermodynamic equilibrium is at least partially cancelled, wherein the predetermined breaking point has a breaking load which is equal to or smaller than the breaking load of the untreated tension member, but greater than the yield point of the untreated tension member.

Method of producing an intended breaking point in a tension member for a

A method of manufacturing an anchor element for a soil anchor or rock anchor, rock bolt or the like, from a strand of twisted steel wire. The anchor element includes a central wire and outer wires arranged radially relative to the central wire. The anchor element has at least one expanded section obtained by spreading the individual wires. Spacer members are provided for fixing the individual wires in the spread-apart position. The central wire is laterally deflected when the individual wires of the strand are being spread and, by inserting a rod-shaped spacer element, the central wire is fixed in an out of center position together with at least one outer wire.

Method for manufacturing an anchor element for a soil anchor for a rock

A corrosion-protected support element for a soil anchor or a rock anchor or a pressure pile includes a support member which is provided with a tubular casing. The hollow space between the support member and the casing is filled out by a hardening material, for example, cement mortar. The tubular casing is a plastics material tube, for example, of PE, which extends over the entire length of the support member. The plastics material tube has the same cross-section over its entire length. In the region of force-transmission between the support member and the bore hole in which the support element is placed, the plastics material tube is deformed at spaced-apart locations to deviating cross-sections having different transverse extensions.

Corrosion protected support element for a soil anchor or a rock anchor,

To facilitate the construction of a very high structural member for use in a body of water such as at an offshore location with the structural member extending from the floor of the body of water to above its surface, tensioning members are inserted into relatively narrow tensioning ducts accessible only from the top of the structural member. The tensioning members, such as steel rods, steel wires, or steel wire strands, are provided with members for effecting a positive locking engagement in a hardenable material forming an anchored length of the tension member at the lower end of the tensioning ducts. Initially, the tension members are lowered into the lower ends of the ducts and then are grouted in the ducts by a hardenable material. After the hardenable material has set over an anchored length, the tension members are tensioned within the ducts. Next, the tensioned length of the tension members in the ducts is grouted with a hardenable material to provide a composite action with the structural member. Accordingly, the tension members are securely positioned within the tensioning ducts and are effectively anchored.

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Munich, Germany

Reinhard Klockner