Search International and National Patent Collections

1. (WO1998013580) A METHOD OF PRE-STRESSING A TENDON

Pub. No.:    WO/1998/013580    International Application No.:    PCT/US1997/017392
Publication Date: Apr 2, 1998 International Filing Date: Sep 26, 1997
IPC: E21D 21/00
Applicants: AMALGAMATED REINFORCING (PROPRIETARY) LIMITED
HANDELMAN, Joseph, H.
SHAW, Francis, David
Inventors: SHAW, Francis, David
Title: A METHOD OF PRE-STRESSING A TENDON
Abstract:
A tendon (10) is installed in a hole (34) in a mine hanging wall (36) by making use of a barrel (14) and a wedge arrangement (16). One end of the tendon is anchored in the hole (34) such that the other end protrudes therefrom. The barrel (14) is positioned over the protruding end of the tendon (10). A tensioning jack applies a tensile load to the tendon (10) and an oppositely disposed load to a shear ring (20) of the barrel. When the desired preload is reached, the shear ring (20) fails permitting the tensioning jack (40) to displace wedge elements (30) of the wedge arrangement (16) inwardly thereby locking the barrel on the tendon and maintaining the desired preload in the tendon.