Patents Assigned to Dyckerhoff & Widmann Aktiengesellschaft
  • Patent number: 6360501
    Abstract: A guide or deflecting unit for a tension member at a structural component of a structure extending outside of the cross-section of the structure. The tension member extends with a change of direction over a deflection point formed at the structural component. The guide or deflection unit is composed of a tubular shaped piece of a deformable material which surrounds the tension member and whose contour is shaped in the longitudinal direction such that its wall thickness decreases from the middle toward the ends in accordance with the curvature of the required deflection. The predetermined curvature is obtained when tensioning the tension member by the contact thereof with a wall of a straight receiving opening.
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: March 26, 2002
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Ingolf Litzenburger, Oswald Nützel
  • Patent number: 6322281
    Abstract: A corrosion-protected tension member of steel composed of a plurality of individual wires twisted into a strand, wherein each of the individual wires of the strand is composed of a steel wire freed from deposits by a surface treatment and surrounded by a continuous sheathing of a corrosion-resistant sheet metal, wherein the sheathing is rigidly connected to the core wire by at least one common cold deforming process with intermediate annealing of the sheathing. The tension member of steel is used primarily as a reinforcement element or a tension member with wedge-type anchoring systems at its ends.
    Type: Grant
    Filed: July 22, 1999
    Date of Patent: November 27, 2001
    Assignees: Dyckerhoff & Widmann Aktiengesellschaft, DWK Drahtwerk Köln GmbH, Bekaert-CMTM GmbH
    Inventors: Dieter Jungwirth, Erich Richartz, Leo Werth, Werner Rempe, Volker Müller
  • Patent number: 6055691
    Abstract: A method of mounting and tensioning a freely tensioned tension member, particularly a stay cable for a cable-stayed bridge, and a device for carrying out the method, wherein the polyethylene casing of each individual strand is removed during the tensioning process over the length of the extension distance occurring during tensioning at the tensioning end. The peeling tool of the device for carrying out the method is composed of a sleeve having at one end thereof at least one cutting edge, wherein the sleeve surrounds the respective strand over at least an essential portion of the circumference thereof. The sleeve can be positioned in a stationary manner between the anchoring disk and the tensioning press, wherein the strand is pulled through the sleeve during the tensioning process.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: May 2, 2000
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Oswald Nutzel, Dieter Jungwirth, Lorenz Schnitzler
  • Patent number: 5924250
    Abstract: A sealing arrangement for closing off the areas to be filled with a casting compound of a tension member composed of a bundle of individual elements arranged within a tubular sheathing, for example, a stay cable of a cable-stayed bridge, includes a sealing plug composed of a first sealing layer of a deformable, non-flowable sealing material introduced between the individual elements, a second sealing layer of a setting or hardenable material introduced in a flowable state and arranged adjacent the first sealing layer in the direction toward the area to be filled out with casting compound.
    Type: Grant
    Filed: August 14, 1997
    Date of Patent: July 20, 1999
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Dieter Jungwirth, Oswald Nutzel
  • Patent number: 5809710
    Abstract: A method of tensioning parallel prestressing members of a building or building component of prestressed concrete or a tension member composed of a plurality of individual elements, such as steel rods, steel wires or steel strands, wherein the individual elements are successively tensioned either individually or in groups. The tensioning method described above includes the steps of tensioning a first individual element or a group of individual elements until a predetermined tension is reached and anchoring the first individual element or group of individual elements; tensioning a second individual element or a group of individual elements until the tension thereof is equal to the tension of the previously tensioned individual element or elements at the same time and anchoring the second individual element or group of individual elements; and repeating the preceding step until all individual elements are tensioned and anchored.
    Type: Grant
    Filed: September 19, 1996
    Date of Patent: September 22, 1998
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Dieter Jungwirth, Alto Mannhart
  • Patent number: 5803641
    Abstract: A device to be used in inserting the individual tension elements of a freely tensioned tension member, for example, a stay cable for a cable-stayed bridge, into a tubular sheathing. A guide element to be attached to the front end of an individual element includes an expansion member whose diameter in its non-expanded state corresponds approximately to the diameter of the individual element, while the diameter in the expanded state is greater than the diameter of the individual element.
    Type: Grant
    Filed: April 3, 1996
    Date of Patent: September 8, 1998
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventor: Oswald Nutzel
  • Patent number: 5707181
    Abstract: 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.
    Type: Grant
    Filed: January 3, 1996
    Date of Patent: January 13, 1998
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Hans-Peter von Allmen, Reinhard Klockner, Erich Richartz
  • Patent number: 5683519
    Abstract: A method and a device for cleaning and exposing portions of limited length of strands of steel wire which are surrounded by a corrosion protection substance, particularly grease, wherein the strands of steel wire and the corrosion protection substance are enclosed by a sheathing of synthetic material. Initially, the sheathing is severed at a distance from the end of the strand corresponding to the length of the portion to be cleaned and an opening is produced. Subsequently, a flushing pipe is connected to the sheathing at the end of the strand and the strand is cleaned by admitting a flushing liquid under high pressure into the space surrounded by the sheathing, so that the corrosion protection substance and the flushing liquid emerge at the opening. Finally, the sheathing is removed entirely from the strand by pulling off the sheathing.
    Type: Grant
    Filed: October 6, 1995
    Date of Patent: November 4, 1997
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventor: Alto Mannhart
  • Patent number: 5624628
    Abstract: A method of introducing a casting compound composed of aggregates and a matrix with a hardening binder into a hollow space within a tubular sheathing of a tension member composed of one or more individual elements, particularly in the anchoring range of the tension member relative to a structural component. In accordance with the method, the aggregates are introduced first and the matrix is then introduced in the liquid state into the grain structure formed by the aggregates. A finely granular material is used as the aggregate. The finely granular material is introduced with the aid of compressed air through at least one tubular lance which is inserted in longitudinal direction of the tension member through the anchoring range.
    Type: Grant
    Filed: September 20, 1995
    Date of Patent: April 29, 1997
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Werner Hansch, Christoph Nieberle, Oswald Nutzel
  • Patent number: 5603589
    Abstract: 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.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: February 18, 1997
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Hans-Peter von Allmen, Reinhard Klockner, Engelbert Gott, Otmar Langwadt
  • Patent number: 5472296
    Abstract: 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.
    Type: Grant
    Filed: August 18, 1993
    Date of Patent: December 5, 1995
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Hans-Peter von Allmen, Thomas Herbst, Reinhard Klockner
  • Patent number: 5439629
    Abstract: A method for the manufacture of pretensioned prestressed concrete sleepers wherein, the tensioning wires are taken directly from one or more rolls of wire and are introduced in a longitudinal feed into a tensioning frame, and the tensioning wires (5) are initially anchored at the end thereof located at the front in feed direction. The wires are tensioned by a tensioning device arranged outside of the tensioning frame and resting against the opposite end thereof, and the wires (5) are anchored at the tensioning device; only then are the wires severed by means of a severing device. In this manner, it is possible to combine in a single station the operating stages of cutting to length, introducing and tensioning the wires, which stages in the past were distributed over several manufacturing stations, so that the labor intensive and time consuming manipulation of wires which have been previously cut to length is eliminated.
    Type: Grant
    Filed: December 23, 1993
    Date of Patent: August 8, 1995
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Joachim Heintz, Peter Auer, Helmut Lieske, Peter Plica
  • Patent number: 5389765
    Abstract: An arrangement for severing a tension member of a permanent soil anchor of ferromagnetic material at a predetermined location includes a coil surrounding the tension member in a tubular manner at the predetermined location, wherein the coil is mountable together with the tension mender. A high temperature-resistant thermal insulation layer is provided underneath the coil and a tubular core is arranged between the high temperature-resistant layer and the tension member, so that the coil forms a primary winding and the core forms a first secondary winding and the tension member forms a second secondary winding. The tension member is severed by applying an electric current having a frequency of approximately 5 to 30 kHz and a voltage of approximately 500 to 800 V to the coil, so that the tensile strength of the tension member is reduced at the predetermined breaking point by the heat produced by induction resulting from the electric current.
    Type: Grant
    Filed: August 17, 1993
    Date of Patent: February 14, 1995
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventor: Toni Baer
  • Patent number: 5135164
    Abstract: A prestressed concrete railroad tie having a tie body made up of two end members for supporting rail attachment parts and a central section extending between and interconnecting the end members and having a transverse cross-section smaller than the transverse section of the end members. Tendons are located in the tie body and extend in opposite directions from a common vertical or horizontal plane in the central section into the end members. At tie ends of the end members the tendons are anchored and are uniformly distributed across the transverse cross-section of the end members. With the tendons centered in the central member, a narrow central member is afforded. The tendons fan outwardly from the common plane in the central section into the end members providing wider or larger end members. This prestressed concrete tie arrangement affords only low changing bending moments in the central section or a positive course of bending moments across the length of the tie.
    Type: Grant
    Filed: September 7, 1990
    Date of Patent: August 4, 1992
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Peter Auer, Josef Eisermann, Helmut Lieske, Gunther Leykauf, Peter Plica
  • Patent number: 4971493
    Abstract: An anchoring device for a tension member of an earth- or rock anchor, where a support element transmitting the tensile force is arranged between an anchoring element undisplaceably connected with the tension member and an anchor plate abuttable against a support base, the support element includes a cylindrical hollow body surrounding the anchoring element, whose inner wall has in its lower region projections protruding inward beyond its inner contour, against which the anchoring element abuts in a force-transmitting manner with partial regions of its cross-sectional area. If a predetermined tensile force is exceeded, the support element and/or the anchoring element can plastically deform in the region of their inter-engaging surfaces, so that a relative displacement occurs in axial direction.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: November 20, 1990
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Thomas Herbst, Lorenz Schnitzler
  • Patent number: 4970773
    Abstract: On a track for electromagnetically levitated vehicles, to adjust and secure side guide rails on a beam-like support member forming the track, after stators are adjusted and fixed to the support member, the side guide rails are held in position relative to the support member. Initially, the guide rails are positioned relative to the track and then are adjusted with respect to a datum plane determined by the lower surfaces of the stators. Next, the guide rails are adjusted horizontally transversely of the track with respect to measuring points fixed to the surface of the support member. Finally, the guide rails are attached to the support member. Apparatus for installing the guide rails includes a plurality of installation truss frames mounting assembly arms for holding the guide rails. Each assembly arm has a holding device for a guide rail and an abutment positionable against a lower surface of the stators.
    Type: Grant
    Filed: July 27, 1989
    Date of Patent: November 20, 1990
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Wilhelm Buchler, Karl-Heinz Lonnecke, Herbert Schambeck
  • Patent number: 4958961
    Abstract: A rod-shaped tension member formed of fiber reinforced composite material is utilized as an anchoring rod in foundation and mining construction, or as a reinforcing member in concrete and prestressed concrete construction. At least, in an axially extending region where it is to receive an anchoring member, such as a rod, the tension member has a continuous helical thread formed of alternating ribs and recesses. The anchoring member has a corresponding thread so that it can be screwed onto the tension member thread. An intermediate layer is provided between the threaded regions of the tension member and the anchoring nut, and is formed of a material affording large plastic deformation relative to the tension member when slight stress increases occur at overload conditions.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: September 25, 1990
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Thomas Herbst, Dieter Jungwirth
  • Patent number: 4953379
    Abstract: In the production of a hot-rolled steel bar, such as a concrete reinforcing bar, a continuous thread is formed on the bar. The thread is arranged so that an anchoring or connecting member with a female thread can be screwed onto the male thread formed on the bar. Initially, first ribs are hot rolled on the bar surface with the ribs located on opposite sides of the bar and extending only for a portion of the circumference of the bar. Immediately following the formation of the first ribs, second ribs are hot rolled extending between and interconnecting the first ribs whereby the first and second ribs form a continuous thread. The ribs are formed in a unit made up of adjacent roll stands, each containing two rolls, the axes of the rolls in one stand are offset by 90.degree. to the axes of the rolls in the other stand. The rolls are interconnected so as to move together. The rolls in each roll stand form a roll gap with shaped surfaces on the rolls for defining the partial ribs forming the continuous thread.
    Type: Grant
    Filed: October 25, 1988
    Date of Patent: September 4, 1990
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventor: Erich Richartz
  • Patent number: 4908129
    Abstract: An arrangement for retaining harmful substances contained in water seeping from a waste dumping ground body includes an impervious layer of mineral sealing materials, such as clay, with an adjacent adsorption layer containing materials capable of binding harmful substances by physical and/or chemical adsorption. The materials may be in the form of admixtures. When seepage water flows very slowly through a layer of mineral sealing materials, it is possible to remove and retain the harmful substances. The permeability of the arrangement reduces with time due to the adsorption process with its sealing effect improving over geological time periods.
    Type: Grant
    Filed: May 23, 1988
    Date of Patent: March 13, 1990
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Klemens Finsterwalder, Jurgen Spirres
  • Patent number: 4905359
    Abstract: In the formation of finished slide surfaces for slide rails on a track for an electromagnetically levitated vehicle, the track is constructed as a girder-like beam with the slide rails located on cantilevered parts of the upper surface of the beam. The beam can be formed of prestressed concrete. Initially the slide rails are provided with a height oversize. The height oversize part of the slide rails is removed and the slide surface of the rails are finished to the desired degree. The height oversize part is removed by cutting and grinding devices mounted on a machine frame movable over the upper surface of the track. The machine frame is adjustable in the vertical direction from a datum plane formed by the lower surfaces of support stators secured to the undersides of the cantilevered parts of the track. The machine frame rides on the upper surface of the beam and is in contact with the lower surfaces of the support stators.
    Type: Grant
    Filed: March 14, 1989
    Date of Patent: March 6, 1990
    Assignee: Dyckerhoff and Widmann Aktiengesellschaft
    Inventors: Lorenz Maier, Wilhelm Buchler, Harald Neumann, Karl H. Lonnecke