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一、工程及事故概况 1989年底某住宅小区有2幢六层楼住宅,三层楼面部位有3只单阳台.5只双阳台挑梁,施工期因面临春节,外地建筑工人急于回家去过年,管理不严,操作粗略,水灰比、级配未按规定严加控制。结果28天后建筑物已砌筑到五层楼面,发现三层楼阳台挑梁混凝土试验强度不足,经现场回弹仪测定也未能达到设计要求,二者仅为设计要求强度65～
I. Overview of Projects and Accidents At the end of 1989, there were two six-storey residential buildings in a residential area. There were three single balconies on three floors and five double balconies. Due to the Spring Festival during the construction period, the construction workers in the field were eager to go home. During the Chinese New Year, the management was lax and the operation was rough. The water-cement ratio and grading were not strictly controlled according to regulations. Results After 28 days, the building has been built to a five-story building, and the strength of the concrete test of the three-story building with a cantilever beam was found to be insufficient. The field rebound tester failed to meet the design requirements. The two are only required for the design strength of 65~