ON LIFTING SCHEME IN DOUBLE -HOISTING FOUR-POINT LIFTING OF LONG REINFORCED CONCRETE PILE

To fulfil field demand of concrete long post hoisting, various conditions of long reinforced concrete post hoisting are analyzed. A definition of optimum lifting-point is given. Optimization of lifting-point is performed in double -hoisting four-point lifting, for both level and whirl hoisting of pile. A mathematical model for double-hoisting four-point lifting is established. A computer software is developed. The current issues of double-hoisting four-point lifting in construction engineering manual are summarized. The effective optimum lifting-point is illustrated for level and whirl hoisting of pile.