Christchurch, New Zealand
The 14-story Radio Network House structure at 155 Worcester Street was damaged beyond repair as a result of ground shaking during the 2010-2011 Canterbury Earthquakes. Based on a review of the structure and surrounding properties, it was concluded that demolition with the use of explosives would allow a more efficient, safer and time-saving operation compared to conventional methods. As this project was selected to be New Zealand’s first ever controlled building demolition by explosives, the project methodology included 3rd party seismograph monitoring to serve as case study data and demonstrate the method did not adversely affect neighboring properties.
ENGEO provided instrumentation services during the demolition, which of consisted a vibration and overpressure monitoring program with a system of 10 triaxial geophone sensors to measure peak particle velocity (PPV) and 6 liner scale microphones to measure atmospheric overpressure.