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Project Control: Developing the As-Planned S-Curves

Project Control: Developing the As-Planned S-Curves. Part 08-01 June 7, 2014. Purpose. Illustrate how to develop a set of As- Planned S-Curves from scheduling information and estimates developed sometime before actual construction operations begin.

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Project Control: Developing the As-Planned S-Curves

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  1. Project Control: Developing the As-Planned S-Curves Part 08-01 June 7, 2014

  2. Purpose • Illustrate how to develop a set of As- Planned S-Curves from scheduling information and estimates developed sometime before actual construction operations begin. • Review the conceptual design estimating process to the extent necessary to set the context. CVEN-349

  3. Learning Objectives • Be able to construct an as-planned schedule of work and cost versus elapsed time from a typical (but simplified) construction project Gantt Chart. • Be able to plot and identify the as Planned S-Curves best representing these schedules. CVEN-349

  4. Who Develops the As Planned Gantt Chart? And When? • It depends upon what part of the process is in question. • We are going to assume that the Gantt Chart is developed by the Contractor to plan construction operations. • We are going to assume that the schedule data are generated sometime before the onset of actual field operations. CVEN-349

  5. Example Construction Project • The project is to reconstruct 2-miles of park access road conforming to Texas FM-Road standards. This involves the following tasks: • Mobilization – Equipment, office set up, etc. • Sub-base preparation – hauling, grading and compaction, redo of some culverts, etc. • Base course construction – hauling, grading and compaction. • Wearing Course construction – shoot and chip • Demobilization – Clean up, equipment, office, etc. CVEN-349

  6. Class Discussion Exercise #2.1 on Construction Methods. Ask Selected Individuals or Pairs to answer the following: • What is Base Material and what is its purpose in the design of the road? • How is the Base built? • What is “shoot and chip?” • What is Pea Gravel? • What is the design profile of a FM Road? CVEN-349

  7. Project Task Duration and Cost Data Assume: • All labor, material and equipment cost estimates are available from the estimating process. • Maximum Task overlap with a 1-day minimum delay on an early start schedule. CVEN-349

  8. Assumed Estimating Process • The entire project is broken into Work Packages (work breakdown structure): build base, shoot and chip, etc. • Estimated unit quantities for each work package are calculated from the plans and specifications at an appropriate level of detail. • The corresponding unit prices and productivity rates are obtained from historical data – We will use the R. S. Means manual in this class. • Work Package (or Task or Activity) durations and costs are derived from the historical data as applied to the estimates. • These data serve as inputs to the scheduling process which result in Bar-Charts similar to the one on the next slide. CVEN-349

  9. Class Exercise 08.01.1 • As individuals describe the crew (equipment and personnel) configuration necessary to construct the base course. • As Pairs agree upon the configuration. • As a Team, estimate the hourly cost rate. CVEN-349

  10. Example Gantt Chart with Related S-Curve % Data Simplifying assumptions: All work is equally weighted where 1 day equals 1 unit of work. Daily work accomplished is NOT a function of daily cost.

  11. Class Exercise #08-01.2 • As Individuals, compute the number of cubic yards of base material required to build 2-miles of FM Road base, 24-feet wide, and 1-foot thick? • As Pairs, compare answers and then compute the linear feet of daily progress, if you can build 2,700 sq-yds of base per day? CVEN-349

  12. What Does all this Imply? The relationship between time and cost and time and work. For example, at the end of day 8 you plan to have completed 50% of the Work and to have spent 47% of the Budget. CVEN-349

  13. Corresponding As-Planned S-Curves Note: The relationship between the scales. There is a reason – to make room for the As-Built S-Curves CVEN-349

  14. Exercise 08-01.3 • Individually, using engineering paper, plot the S-Curves for these data, label the axes, the curves, and the plot. • Turn in your work before you leave. CVEN-349

  15. Module Assessment Question • If you had to ask a question about this topic, what would it be? CVEN-349

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