Cause analysis of collapse of a 33-story residential building in Chongqing

Unauthorized excavation is not standardized and has been in disrepair for a long time.

1. Irregular excavation operation: The 33rd-floor residential building in Chongqing collapsed because the residents excavated their own houses privately, did not understand the building structure, and destroyed the load-bearing beam, which led to the collapse.

2. Years of disrepair: The 33rd-story residential building in Chongqing collapsed because it took a long time to build, and no corresponding maintenance and construction were carried out, resulting in years of disrepair and serious loss of housing infrastructure.