Encasing tubing having continuous bonding enhancing properties
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United States of America Patent
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-
Aug 13, 1991
Grant Date -
N/A
app pub date -
Mar 7, 1989
filing date -
Mar 8, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The wall (5) of the encasing tube (1) includes spiralling protrusions (3, 4). First protrusions (3) and second protrusions (4) run either in different directions or in the same direction but at different pitches. The encasing tube is used for enclosing tensioning cable (2) in concrete structures. By means of the particular arrangement of the protrusions, the flow properties of the grout are improved, air bubbles are virtually eliminated during injection, and the bonding properties of tensioning cables are improved by means of large bonding zones while respecting the required high fatigue strength.
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