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一、工程概况与事故原因上海马桥冰箱厂总装车间为1989年动工兴建的二层多跨钢筋混凝土现浇框架结构,其上铺设180mm 厚预应力空心楼板作为结构受力体系。车间纵向长度144m,宽度30m,总建筑面积约9000m~2。底层柱距7.5m,二层柱距15m。二层层高5.0m。屋面大梁为花篮梁结构,截面尺寸30×130cm,
I. Overview of Projects and Causes of Incidents The general assembly workshop of Shanghai Maqiao Refrigerator Factory is a two-story, multi-span reinforced concrete cast-in-place frame construction started in 1989. A 180 mm-thick prestressed hollow floor is placed on the structural assembly as a structural force system. The vertical length of the workshop is 144m, the width is 30m, and the total construction area is about 9000m~2. The base pitch is 7.5m and the second base is 15m. The second floor is 5.0m high. The roof beam is a flower basket beam structure with a section size of 30×130cm.