The blast key method is an advanced roughening that is environmentally safe method.
In the conventional case, roughening work occurs large vibration, noise and dust during seismic reinforcement progress. Also, resulting complaints came from neighbors and surround residents. In addition this method sets a bit special modification at the tip of the core drill, and cut the existing frame with wet the core drill to reduce dust during construction without damaging the housing surface. It is an eco-friendly roughening method that suitable for reinforcement work while the building is being used by people.
