Abstract：
During construction of special plant structures, such as chimney, water tower, storage hopper and oil tube, etc., vertical slip formwork is the best formwork. The whole formwork structure and construction operation platform are lifted by a small hydraulic jack. This construction is quick and convenient, and needs not to set construction joint, but it has strict operation requirements and is difficult to be corrected if obliquity occurs. If the slip lifting is uneven, crack may be easily generated on the concrete wall and its repair is difficult. Especially, the construction of connected silos is stricter.
