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Bethesda Triangle

Bethesda Triangle. Brian Groark Construction Management Faculty Consultant: Dr. Messner. Bethesda Triangle. 14 story apartment building Additional 4 stories below grade for parking 580,000 SF Cast in place concrete structure Offices and retail on plaza level

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Bethesda Triangle

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  1. Bethesda Triangle Brian Groark Construction Management Faculty Consultant: Dr. Messner

  2. Bethesda Triangle • 14 story apartment building • Additional 4 stories below grade for parking • 580,000 SF • Cast in place concrete structure • Offices and retail on plaza level • High end apartments on floors 12-14

  3. Bethesda Triangle • Owner: Bethesda Triangle, LLC • CM: Encore Development • Construction began on February 14, 2002 • Phased occupancy • Little site space

  4. Bethesda Triangle

  5. Thesis Overview • SIPS Schedule • Change emergency generator • Change formwork • Guidelines for mold prevention

  6. CM Depth Short Interval Production Schedule (SIPS)

  7. Reasons for Using SIPS • Lack of solid schedule for the project • Project will finish extremely late • Needs solid, detailed schedule for all aspects of the project • Repetitive floors work well for SIPS

  8. SIPS • Create a detailed SIPS schedule for the concrete structure • Compare it to the original duration for the structure

  9. SIPS • Each floor is broken up into 4 sections • Crews follow in progression through all the sections and floors • Each section has the same duration

  10. Section Layout

  11. SIPS • Floors G4 – plaza level are the same • Floors 2 – 14 are the same • Each section takes 2 weeks to complete

  12. SIPS

  13. Results • Original duration was 44 weeks • SIPS duration is 31 weeks • Time saved is 13 weeks

  14. Electrical Breadth Change Emergency Generator

  15. Original Generator • 2 mega-watt generator • Power entire building in the event of a black out • Sell extra power back to the grid at times when the costs of running the generator are less than electricity costs

  16. New Generator • 350 kilo-watt generator • Power only emergency systems • Emergency lighting and alarms • Fire pump • Stairwell pressurization • Smoke exhaust • Elevator

  17. Initial Costs • 2 mega-watt – $540,000 • 350 KW - $40,000

  18. Cost Analysis

  19. Cost Analysis

  20. Cost Analysis • Costs of running the generator to power the building were compared to purchasing electricity on an hourly basis

  21. Results • No profit is shown from running the generator • Price of diesel fuel has increased

  22. Recommendation • Use proposed generator • Initial cost savings of approximately $500,000

  23. Structural Breadth Change Formwork System

  24. Original Formwork • Traditional formwork • Built in place with shoring • Stripped and re-shored

  25. New Formwork System • Symons flying truss system • Large aluminum forming tables are flown into position with a crane • Much higher productivity

  26. Slab • Original slab was a flat slab with drop panels • Flying truss system can only be used with flat plate slabs • Slab was redesigned to a 10” flat plate to accommodate the new forming system

  27. Productivity • With a crew of six workers: • Hand set system – 544 sq ft per day • Flying truss system – 7500 sq ft per day

  28. Comparison Form costs Slab Costs

  29. Results • Total cost savings of approximately $950,000

  30. Research Mold Prevention Guidelines

  31. Effects of Mold in Buildings • Less serious symptoms of toxic mold poisoning • Skin rashes • Fatigue • Coughing • Headaches

  32. Effects of Mold in Buildings • More serious symptoms of toxic mold poisoning • Impaired breathing • Memory loss • Hearing, speech, and eyesight degradation • Loss of balance

  33. Causes of Mold • Moisture • Leaks • Condensation

  34. Guidelines for Prevention • Clear details of all exterior penetrations • Design must provide for adequate roof drainage • No changes to design of enclosure without architects approval • Proper slope of grading

  35. Guidelines for Prevention • Drywall must remain dry • Complete enclosure of building prior to drywall installation • Use drywall designed to reduce mold growth • Proper inspection • Proper operation of equipment

  36. Conclusions • SIPS can reduce schedule duration • Larger generator is not profitable at current fuel prices • Flying truss formwork greatly increases productivity • Early mold prevention can save costly repairs in the future

  37. Questions ?

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