OTB CONTRACTING

Post-Tensioning Repairs & Alteration

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Unbonded Post-Tensioning Systems

Post-Tensioned concrete construction represent an important and growing percentage of todays building structures. Tendons supporting these structures may be damaged over time by corrosion or accidentally during rehabilitation or alteration  works. OTB Contracting has the experience, specialty hardware and equipment to :
- Precisely locate tendon paths and strand break position using advanced electromagnetic detection tools,
- Investigate and assess Post-Tensioned tendons and structures including visual, lift-offs or tension measurements,
- Perform repairs to re-splice and re-stress damaged tendons to preserve the structural stability and strength,
- Modify the Post-tensioning layout in order to allow the creation of slab openings or removal of any portion of the existing structure,
- Perform repairs and alteration on old or exotic Post Tensioning systems such as Button Head wires, 3/8" and 6/10" strands or Precast Prestressed structural elements
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OTB Contracting designed and produced a special PT cable tension gage that allows structural engineers to collect actual force data in the tendons for condition assessments and safety evaluations by executing a side pull with no need to access the anchors or a full depth demolition or opening. The patented equipment features a fully digital controls, acquisition and displays for the highest degree of accuracy.

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Grouted/Bonded Post-Tensioning systems
 

Our expertise in bonded multi-strand systems includes assessment and repairs using the following techniques:

- Destructive and Non-Destructive inspections (GPR, Radiodetection, boroscope and volume measurement of voids and cavities).

- Tendon repairs with splicing techniques.

- Multi-Strand cable controlled de-tensioning and replacements.

- Advanced vacuum injection techniques of voids and cavities for corrosion protection 9internal and external tendons).

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9109 Euclid Av. #105 / Manassas, VA 20110 / Phone: (703) 659-1069 Fax: (703) 659-0943

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