New Pre-Tensioning Method "NAPP Method" (Hollow PC Steel Rod)

Our factory has already introduced tensioning. This is a PC steel bar that does not require tension management or grouting work at the construction site.

The NAPP method involves placing pre-tensioned hollow PC steel rods, called "NAPP units (R)," within a formwork, and after pouring and curing the concrete, releasing the tension to introduce prestress into the concrete. The tension is introduced at our factory, which is strictly managed, and delivered to the site. At the construction site, prestress can be applied without the use of reaction abutments or hydraulic jacks, and the complicated management of tension, sheath placement, and grouting is not required. This method particularly enhances efficiency in work environments where it is difficult to introduce prestress, such as at high altitudes. ■ Examples of NAPP method implementation Reinforcement of external cable anchorage, reinforcement of misalignment areas, reinforcement of PC steel anchorage, shear reinforcement, and lateral tightening. ■ Examples of NAPP anchor method implementation Widening of existing bridge abutment edges, reinforcement of external cable anchorage, and reinforcement of bridge substructures (widening of low slabs).

Steel