Apparatus for retensing pre-stress structure
OwnerJae Man Parkinventor
Life of this patent
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Abstract
An apparatus for retensing a pre-stress structure. The apparatus includes a tensing apparatus installed at a rear portion of a precast strand support fixing member exposed from both ends of a prestress structure such as a precast beam for repeatedly tensing a precast strand having a stress loss. A checking member provided at the retensing apparatus for visually checking a stress loss in the tensed precast strand for thereby implementing an easier tensing of a reinforcing strand which is needed when fabricating a prestress structure and retensing an internal reinforcing strand even when a prestress loss occurs for thereby repeatedly retensing a deformed prestress structure.
Claims8
An apparatus for retensioning a prestressed structure, comprising:
- retensioning means at a rear portion of a strand support fixing member having tensioned strands exposed from both ends of a prestressed structure for retensioning said tensioned strands exhibiting a stress loss;
- wherein said tensioning means comprises jack means, said jack means comprising plunger means disposed in an interior chamber of said jack means, said plunger means capable of axial displacement upon application of fluid pressure into the interior chamber of said jack means, said jack means including a tension side port for application of fluid to said interior chamber and a relaxation side port for removal of fluid from said interior chamber, and said strands passing through said jack means;
- and
- means for visually determining a stress loss in said tensioned strands.
Dependencies are inferred from the claim text.