| According to the theory of lean construction, we know there are many flow processes of the resource and information in the project, these flows are mostly non-transformed (non-value-added) activities, in order to eliminate waste, improve project efficiency, it is necessary to optimize the non-transformed (non-value-added) activities. The traditional construction model is only concerned about the optimal management of the conversion (value added) activities, but they ignore the hidden material flow between the non-transformed (non-value-added) activities, such as information sharing, resources waiting and delivery of activities; and the fact that the flow of these substances is often the main reason for the project schedule delay, this flow activities will be referred to as flow constraints.Therefore, in order to effectively control project progress and avoid schedule delays, the paper will propose a theoretical framework for integrated constraint modeling based on the principles of lean construction, and on this basis, combining the Theory of Constraints approach, to improve the traditional CPM scheduling model, so that it can meet the requirement to make reliable work plan. |
