Rock anchor assembly for securing roadways and wall surfaces of open cuts and tunnels

US4850746A · kind A · utility

Assignee

• Dyckerhoff & Widmann Aktiengesellschaft · DE

Inventors

• Klemens Finsterwalder · Mörlbach, DE
• Rudiger Bartsch · Kirchweg, DE

Key dates

• Filing date: Apr 18, 1988
• Grant date: Jul 25, 1989
• Expiry date: Apr 18, 2008

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21D21/0033
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

To secure roadways and wall surfaces of open cuts and tunnels, a rock anchor assembly is inserted into and secured within a borehole in a receiving material. The rock anchor assembly is made up of an axially elongated tension member laterally enclosed in part by an axially elongated sheathing tube so that the tension member projects outwardly from the opposite ends of the sheathing tube. In the insertion direction, the leading end of the sheathing tube is secured in tension-resistant locked engagement with the tension member. Initially, a hardenable adhesive material is injected into a borehole and then the assembled tension member and sheathing tube are inserted into the adhesive material so that the unsheathed end of the tension member is anchored in the base of the borehole. The trailing end of the sheathing tube has a flange which bears against a anchor plate in contact with the surface of the receiving material in which the borehole is formed. An anchor nut is secured on the tension member and presses the trailing end of the sheathing tube against the anchor plate and the anchor plate against the receiving material. Accordingly, the leading end of the tension member and the an…