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宝钢工程是我国建国以来的一项最大重点建设工程。大型冶金设备基础的混凝土量很大,如高炉、转炉、焦炉等基础每个混凝土量达5000～7000m~3,而且结构复杂,技术要求高,施工难度大,施工期又短,因此,在施工中需要采用泵送混凝土集中连续浇灌。而泵送混凝土具有水泥用量大、砂率高、水灰比大、浇灌速度快等特点,当掌握不好时,极易引起混凝土构筑物产生裂纹的危险。特别是主电室、主控制室、轧机、各种工业炉、电缆隧道、通风道、排烟道和油库等基础和地下工程,一般均为地下箱形结构,底标高都在地面以下-5～-10m,会受到地下水
Baosteel project is one of the largest key construction projects since the establishment of China. Large-scale metallurgical equipment has a large amount of concrete, such as blast furnaces, converters, and coke ovens. The amount of concrete per foundation is 5,000 to 7,000 m 3, and the structure is complicated, technical requirements are high, construction is difficult, and the construction period is short. Therefore, In the construction, it is necessary to use pumped concrete for continuous and centralized irrigation. The pumped concrete has the characteristics of large amount of cement, high sand rate, large water-cement ratio, and high watering speed. When it is not well mastered, it can easily cause cracks in concrete structures. In particular, basic and underground works such as main electric rooms, main control rooms, rolling mills, various industrial furnaces, cable tunnels, ventilation passages, exhaust passages, and oil depots are generally underground box-shaped structures, and the bottom elevations are all below ground level -5 ~-10m, will receive groundwater