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© Tarek Hegazy – 1 Efficient Scheduling of Repetitive Projects Prof. Tarek Hegazy Computer-Aided Construction Project Management, & Infrastructure Asset Management
© Tarek Hegazy – 2 Linear & Repetitive Projects Problems with Existing Tools Proposed Management Models Implementations Highway Application High-Rise Application Distributed Sites Application Conclusion Linear Linear & Repetitive Projects Problems Problems with Existing Tools Proposed Proposed Management Models Implementations Highway Application High-Rise High-Rise Application Distributed Distributed Sites Application Conclusion Agenda
© Tarek Hegazy – 3 Horizontal Horizontal Distributed Vertical Linear & Repetitive Projects
© Tarek Hegazy – 4 Linear & Repetitive Projects Various Types: Horizontal, Vertical, & Distributed Large Size & Many Resources Combination of In-House & Outsourcing Complex to Schedule & Control Sensitive to Environment Stringent Deadlines & Budgets Various Various Types: Horizontal, Vertical, & Distributed Large Large Size & Many Resources Combination Combination of In-House & Outsourcing Complex Complex to Schedule & Control Sensitive Sensitive to Environment Stringent Stringent Deadlines & Budgets
© Tarek Hegazy – 5 TimeTime ActivityActivity Task 5 Task 7 Task 6 Task 1 Task 4 Task 3 Task 2 Existing Tools Not suitable for repetitive projects No legible view of the large project data Inadequate planning No cost Optimization Not Not suitable for repetitive projects No No legible view of the large project data Inadequate Inadequate planning No No cost Optimization
© Tarek Hegazy – 6 Objectives New Scheduling Model: Better Representation Work Continuity Meet Deadlines Flexible Planning Cost Optimization New New Scheduling Model: Better Better Representation Work Work Continuity Meet Meet Deadlines Flexible Flexible Planning Cost Cost Optimization
© Tarek Hegazy – 7 Station 1 Station 2 Station n Linear Scheduling Model
© Tarek Hegazy – 8 Site Time AB C D Crews: End Date New Representation How to Design the Schedule?
© Tarek Hegazy – 9 C = D x R Crew 2 Crew 1 Crew 3 Crew 2 Crew 1 Unit Time S u = S u-1 + 1/R i F u = S u + D i S u = S u-1 + 1/R i F u = S u + D i One Activity - 3 Crews Work Continuity
© Tarek Hegazy – 10 Time Units 3 Parallel Crews 3 Stagg. Crews Work Continuity Color coded Crews
© Tarek Hegazy – 11 Station Time A A D D B B C C Low Pr Crew 3 Crew 2 Crew 1 Crew 2 Crew 1 Scheduling Flexibility A: single crew from units 3 to 8 A: single crew from units 3 to 8 C: crew continuity under variable durations C: crew continuity under variable durations B: work interruption at unit 6 B: work interruption at unit 6 D: red and blue crews move from both sides at same time (channel tunnel) D: red and blue crews move from both sides at same time (channel tunnel)
© Tarek Hegazy – 12 Optional Construction Methods Resource Data MaterialMaterial SubsSubs CrewCrew LaborLabor EquipmentEquipment CostOptimizationCostOptimization Method 3 Method 2 Method 1 Activity i From Slow & Cheap to Fast & Expensive
© Tarek Hegazy – 13 Cost Optimization Complex Problem – Genetic Optimization Direct Cost + Indirect Cost + Penalty/Incentive Objective Function: Duration <= Deadline Individual Resources <= Max. Allowed Constraints: No. of Crews Work Methods (3 options) Variables:
© Tarek Hegazy – 14 Different Implementations
© Tarek Hegazy – 15 Example 3 Km highway, each station is 300 m (i.e., 10 stations) 1. Highway Application Right of Way
© Tarek Hegazy – 16 Data of activities, project constraints, and productivity data 1. Highway Application
© Tarek Hegazy – 17 Estimate 1 Estimate 2 Estimate 3 StationMax.Crews($)(d)($)(d)($)(d) 1. Excavation, E. 2. Sub-base, East 3. Base, East 4. Binder, East 5. Asphalt, East 6. Curbs, East 7. Lighting, East 8. Sidewalks, E. 9. Paint, East 1to K 7.8 K 72 K 30 K 14.4 K 31.2 K 19.2 K 11 K K K K 25 K K Data of activities’ optional estimates Means Cost Data 1. Highway Application
© Tarek Hegazy – 18 Station 1. Excavation, East 2. Sub-base, East 3. Base, East 4. Binder, East 5. Asphalt, East 6. Curbs, East 7. Lighting, East 8. Sidewalks, East 1to5 9. Paint 1 to to 17. Same as 1-8 but at West Side 10 to 6 Construction Method TWO set of Crews moving from Both Sides 1. Highway Application
© Tarek Hegazy – 19 User input of the three estimates 1. Highway Application
© Tarek Hegazy – 20 West Sections East Sections Deadline not met Click on any activity to get detailed schedule data Color- coded crews. Options 1. Highway Application Initial schedule
© Tarek Hegazy – 21 Deadline met After Optimization 1. Highway Application
© Tarek Hegazy – 22 Different Implementations
© Tarek Hegazy – 23 Unique Considerations: Structural–Core Representation Horizontal and Vertical Constraints Weather and Learning Curve Effects Introducing Proper Work Interruptions Meet Project Deadline Alternative Construction Methods Presenting a Clear & Realistic Schedule Structural–Core Representation Horizontal and Vertical Constraints Weather and Learning Curve Effects Introducing Proper Work Interruptions Meet Project Deadline Alternative Construction Methods Presenting a Clear & Realistic Schedule 2. High-Rise Application
© Tarek Hegazy – 24 Vertical Constraints: Dependences among activities on Different Floors t2t2 B B Floor Time t3t3 t1t1 Shift Time A Shoring Removal Pre-Cast panels Installation Windows Installation 2. High-Rise Application
© Tarek Hegazy – 25 Standard Vs Non-Standard floors Time 1 10 Floor 20 Structural Core activities after reduction Structural Core activities before reduction 2. High-Rise Application
© Tarek Hegazy – 26 Ground Floor Residential Floors- 8 th to 13 th (50% of Standard Floors) Sketch of Hypothetical Building Basement CPM Network for The Case-Study 2. High-Rise Application
© Tarek Hegazy – 27 Activities Cost and Durations 2. High-Rise Application
© Tarek Hegazy – 28 Project Constraints Deadline = 11 months (220 working days) Total Budget : $17 millions Indirect Cost: $5,000 per day Liquidated Damage: $100,000 per day Incentives: 10,000 per day 3 Construction methods / Activity Monthly productivity factors Floor changes at the 8th level Deadline = 11 months (220 working days) Total Budget : $17 millions Indirect Cost: $5,000 per day Liquidated Damage: $100,000 per day Incentives: 10,000 per day 3 Construction methods / Activity Monthly productivity factors Floor changes at the 8th level 2. High-Rise Application
© Tarek Hegazy – 29 Data Input 2. High-Rise Application
© Tarek Hegazy – 30 Specifying Constraints 2. High-Rise Application
© Tarek Hegazy – 31 Initial Schedule Optimization Needed! 2. High-Rise Application
© Tarek Hegazy – 32 Schedule Optimization Resources Vs Deadline Number of Crews Construction Methods Interruption No. Cycles Resources Vs Deadline Number of Crews Construction Methods Interruption No. Cycles 2. High-Rise Application
© Tarek Hegazy – 33 Results Structural Activities Pre-cast Panels Stud Windows Vertical Constraints Are Met 2. High-Rise Application
© Tarek Hegazy – 34 Visualization Reports Very Useful for Site Personnel During Project Control 2. High-Rise Application
© Tarek Hegazy – Projects with Multiple Distributed Sites (e.g., Multiple Houses) Different Implementations
© Tarek Hegazy – 36 Infrastructure Management Systems Execution order? Outsourcing? In-house resources? Meet Strict deadline? Normal / Overtime? Execution order? Outsourcing? In-house resources? Meet Strict deadline? Normal / Overtime? Execution Planning List of Priority Assets & Repair Types M&R Planning 3. Distributed Sites
© Tarek Hegazy – 37 End Time Crew 1 Crew 2 Site 5 Site 1 Site 2 Site 3 Site 4 Crew 1 Crew 2 Crew 1 Crew 2 Repair Activity Repair Activity for Five Schools Crew 1 Distributed Scheduling Determines: Crews, Work Methods, & Site Order that Meet Deadline with Minimum Cost. Crew Moving – Delivery Methods
© Tarek Hegazy – 38 Delivery Approaches for MR&R Programs Delivery Approaches for MR&R Programs In-House Resources Outsourcing + Out-Tasking Combination of All Combination of All MR&R Delivery Options
© Tarek Hegazy – 39 Activities i Time cost Time cost Time cost 2. Built-In Auto-Estimates: Work assignment options: Normal work, Overtime, or Weekends - Work continuity - Enhanced presentation Optimum values of: - Order of execution - Work assignment option - Activity Crews - Crew non-work periods Planning Cost Optimization - Project status - Progress Updates Optimum corrective actions Actual Progress Re-Optimization o Order of execution o Contractors vs in-house o Automated Estimates o Crew Work Continuity o Deadline Duration o Resource limits o Specific Site Conditions o Crew Movement Time/Cost o GIS-based site distances o Palm TM – based progress 3. Planning & Control: Features 1. Resource Depository:
© Tarek Hegazy – 40 Real-Life Application - Activitiies, - Logical Relations - Three Estimates. - Activitiies, - Logical Relations - Three Estimates. Slow & Cheap Option Fast & Expensive Option
© Tarek Hegazy – 41 Data inputs for activity delivery and constraints Real-Life Application
© Tarek Hegazy – 42 Real-Life Application Initial Schedule Two Outsourced sites Deadline not met Initial Schedule Two Outsourced sites Deadline not met
© Tarek Hegazy – 43 Real-Life Application Deadline met at Min. cost. Schedule => GIS Deadline met at Min. cost. Schedule => GIS
© Tarek Hegazy – 44 Visualization Automated Dispatch Maps
© Tarek Hegazy – 45 Visualization Automated Dispatch Maps
© Tarek Hegazy – 46 Benefits Cost-Effective delivery In-house vs outsourcing vs out-tasking Ties to Asset Management Systems Realistic execution to meet constraints Do more for less & reduce backlog Speedy corrective actions Cost-Effective delivery In-house vs outsourcing vs out-tasking Ties to Asset Management Systems Realistic execution to meet constraints Do more for less & reduce backlog Speedy corrective actions
© Tarek Hegazy – 47 DEMO EasyPlan DEMO
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