Pipes and tubular conduits – Reinforced – Corrugated
Patent
1989-03-07
1991-08-13
Bryant, III, James E.
Pipes and tubular conduits
Reinforced
Corrugated
138103, 138108, 138110, 138122, 138177, 745025, F16L 1112
Patent
active
050388347
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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Bryant III James E.
VSL International AG
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