ABSTRACT
The development and understanding of a construction schedule is an important aspect as part of project and construction management to recognize key construction activities, and the anticipated completion of the project. The most frequently used format for the presentation of a construction schedule is a Gantt chart that illustrates the start and finish dates of the main work activities, and shows the dependency relationships between the main work activities. Rail-line or linear type schedules are developed as an alternative method of presentation to a bar chart. These provide the benefit of being able to visualize multiple tunnel headings and associated access adits as part of the entire tunnel construction schedule. The procurement lead time for key equipment for tunnel construction is an important aspect to recognize for the development of a representative construction schedule. The typical procurement lead time for a new TBM is approximately 12 months based on industry practice from most TBM suppliers.
