Tension tie member

US4633540A · kind A · utility

Assignee

• Dyckerhoff & Widmann Aktiengesellschaft · DE

Inventors

• Dieter Jungwirth · Munich, DE
• Gerd Thielen · Krefeld, DE
• Otmar Langwadt · Borgo San Lazzaro, DE

Key dates

• Filing date: Apr 30, 1985
• Grant date: Jan 6, 1987
• Expiry date: Apr 30, 2005

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E01D19/14
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A tie member includes at least one tension element, such as a steel wire or strand, enclosed within a tubular sheathing. An anchoring unit is located at each end of the tie member for transmitting the tension force to a part of a structure. Each anchoring unit includes an anchor plate with at least one conically shaped bore so that a tension element can be secured in the borehole by a multi-part annular wedge. To provide additional corrosion protection and improve fatigue strength in the anchorage, the tension element is enclosed within a coating of a synthetic resin for its entire length. The inside surface of the wedge is shaped between the ends with a series of coarse or rough teeth with the tips rounded off. When the wedge grips a tension element the synthetic resin material is displaced by the teeth, however, the resin material continues to cover the surface of the tension element not contacted by the teeth so that oxygen is prevented from communicating with the areas where the wedge and tension element are in contact whereby friction corrosion cannot take place.