Coupler for ducts used in post-tension rock anchorage systems

Details Coupler for ducts used in post-tension rock anchorage systems Coupler for ducts used in post-tension rock anchorage systems

1996-04-25

1998-07-07

Graysay, Tamara L.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

285322, E21D 2100

Patent

active

057758492

ABSTRACT:
A duct system for a post-tension rock anchorage system including a first duct having a plurality of corrugations extending radially outwardly therefrom, a second duct having a plurality of corrugations extending radially outwardly therefrom, and a tubular body threadedly receiving the first duct at one end and threadedly receiving the second duct at an opposite end. The tubular body has a first threaded section formed on an inner wall of the tubular body adjacent one end of the tubular body and a second threaded section formed on the inner wall of the tubular body adjacent an opposite end of the tubular body. The threaded sections are formed of a harder polymeric material than the polymeric material of the first and second ducts. The tubular body has an outer diameter which is less than the diameter of the ducts at the corrugations. The first and second threaded sections have a maximum inner diameter which is less than the outer diameter of the ducts at the end of the ducts. First and second elastomeric seals are affixed to opposite end of the tubular body and juxtaposed against a surface of a corrugation of the first and second ducts.

REFERENCES:
patent: 3304829 (1967-02-01), Raynovich, Jr.
patent: 5038834 (1991-08-01), Siegfried
patent: 5320391 (1994-06-01), Luthi
patent: 5474335 (1995-12-01), Sorkin
patent: 5524940 (1996-06-01), Wartluft
VSL Corporation, VSL Post-Tensioning Systems, Mar. 1994, pp. 28-30.
Dywidag Systems Incorporation, Dywidag Rock and Soil Anchors, 1994, pp. 1-16.

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