Seismic reinforcement method for columns using slits in post-construction sections - 'Thin Residual Type Complete Slit' by high-precision machines.

The "thin residual type complete slit" created by high-precision machines is a partial slit method that achieves effects equivalent to a "complete slit."
As of August 2021, the expansion and update of the technical evaluation application scope have been completed.
((Foundation) Japan Building Disaster Prevention Association, Kenbousai Hatsudai No. 30120)
【Adoption Results】
■ Period: 2011 to September 2015
■ Total: 36 cases
■ Building Uses: Multi-family housing, schools, hospitals, offices
【Expansion of Application Scope】
1. Change in slit shape for columns with waist walls and drop walls (retaining concrete fragments of window frames)
2. Concrete strength for columns with side walls (between 13.5 N/mm² and 36 N/mm²)
3. The standard slit width is 30 mm, with no upper limit
4. Addition of two-way slits for columns near side walls
5. Reinforcement bars crossing within the slit are generally to be cut. However, one horizontal bar within the waist wall may be retained.

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This is a partial slit method that achieves effects equivalent to a 'complete slit'.