scheduling

Introduction to Construction Scheduling

  • Speaker: Donnie Holmes, Georgia Northwestern Technical College

  • Course: CMTT 2130 Construction Scheduling

Defining Scheduling

  • Concept of Scheduling:

    • Scheduling is the planning of a project step-by-step.

    • Involves a sequence of events from start to finish, including preliminary phases and closeout procedures.

  • Key Components of Scheduling:

    • Listing Events:

      • Events must be listed in a logical sequence.

      • Common sequence includes grading, foundation work, framing, roofing, siding, and installation of utilities.

    • Timetable:

      • Scheduling acts as a timetable for construction activities.

      • Timeliness is crucial; projects must adhere to anticipated durations to prevent overruns.

      • Example: If framing takes a day and a half, a schedule should realistically reflect that without unnecessary padding.

    • Goals and Objectives:

      • Important milestones must be set, such as foundation inspection dates.

    • Activities and Relationships:

      • Multiple activities can occur simultaneously, e.g., roofing while siding or wiring.

    • Additional Considerations:

      • Details including specific dates, deliveries, and equipment availability.

Importance of Scheduling

  • Professional Guidance:

    • It is essential for efficiency; poor scheduling can lead to significant project delays.

    • Reference to the 1976 Montreal Olympic Stadium where inadequate scheduling caused setbacks.

  • Real Estate Implications:

    • Construction scheduling is critical to meet project delivery timelines, especially with pre-leased buildings.

    • If promises are made to tenants regarding occupancy, delays can lead to financial repercussions.

Phases of Scheduling

  • Preconstruction Planning:

    • Activities before physical development, including:

    • Dates for obtaining permits (building, land testing).

    • Arrangements for temporary power and utility confirmations.

  • Construction Schedule:

    • Detailed timeline and sequence of construction activities discussed in class.

  • Post-Construction Scheduling:

    • Activities at the end of a project, known as the closeout, which include:

    • Punch lists for completion of tasks.

    • Possible training and operational demonstrations for equipment.

Planning and Scheduling Process

  • Components of the Process:

    1. Establish a project plan.

    2. Identify project activities to be performed.

    3. Determine the sequence of activities.

    4. Estimate activity durations.

    5. Perform schedule calculations.

    6. Revise and adjust the schedule as needed.

    7. Monitor and control schedule progression.

Types of Schedules

  • Bar Chart Schedule:

    • The simplest form; graphical representation.

    • Easy to read, can be created using software (e.g., Excel).

  • Matrix Schedule:

    • Best for repetitive tasks (e.g., high-rises).

    • Easier to read for trade workers, allows for duplication of tasks across similar units.

  • Network Schedule:

    • The most comprehensive method, often regarded as the most effective.

    • Detailed planning involving experienced teams; functions as a roadmap for the project.

    • Examples include:

      • Activity on Arrow: Activities represented by arrows connecting circles.

      • Activity on Node: Activities are represented within boxes denoting different phases of project execution.

Scheduling Calculations

  • Forward Pass:

    • A calculation method used for determining the earliest completion times.

  • Backward Pass:

    • A method to determine the latest start and finish times ensuring that the project on track.

    • The goal is to achieve zero at the end point or the beginning, validating timeline adjustments.

Conclusion and Next Steps

  • Introduction concludes with an expectation of further lectures covering chapters one and two.

  • Students will be engaged with quizzes and assignments relating to upcoming content.