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某专用粉车间为6层现浇钢筋混凝土框架结构,设计荷载为8千牛/米~2,三层楼面上安有震动筛,水平震动较大。该工程在浇筑二层柱和三层楼板混凝土时,由于漏振产生孔洞,最大孔洞700毫米×700毫米,最大深度360毫米,有一根主梁与柱子的接头处在500毫米范围内全贯通。为确保工程的使用安全,首先必须保证加固补强后新、旧混凝土粘结可靠,在荷载作用下能共同作用;其次是保护好梁、柱钢筋,在加固补强施工中不碰伤扭曲。经多种方法案比较,认为用碾打法施工工艺进行加固补强是可行的,加固后经加荷测试以及几年运转生产证明结构完好。
A dedicated powder workshop is a 6-storey cast-in-situ reinforced concrete frame structure with a design load of 8 kN/m2. There is a vibrating screen on the three-story floor and the horizontal vibration is relatively large. During the construction of the two-story column and the three-story slab concrete, the holes were generated due to the leakage vibration. The largest hole was 700 mm×700 mm and the maximum depth was 360 mm. There was a joint between the main beam and the column that was completely penetrated within 500 mm. In order to ensure the safety of the project, first of all, it must be ensured that the new and old concrete will be reliably bonded after reinforcement, and they will work together under load; secondly, it will protect the beams and column steel bars, and will not be damaged or damaged during reinforcement and reinforcement. Through comparison of various methods, it is considered that the reinforcement and reinforcement by the rolling-drilling construction process are feasible, and the reinforcement test after the reinforcement and the production verification structure in several years are in good condition.