Ring Wall Ventilation System

1. Ring Wall Ventilation System Readiness Review 11 December 2001 John Good Project Engineer

2. Goal • Establish what needs to be done prior to the Holiday break to prepare us for 2 January 2002. • Address issues left hanging in the last Review.

3. Milestones Since 6 November 2001 • Major Sub-Tasks Status • Dome Modifications – Complete • Louver Fabrication – Delivery at 46% by Tomorrow. • Flashings – In Fabrication, Delivery 4 Jan 2002. • Shutter Rail Hoist – 50% • Auxiliary Steel – Complete • Electrical & Controls – Design Complete, Materials on Order, Control Panel to be fabricated in Austin. • Weather Curtain – In Fabrication. • Tooling & Equipment – Pending. • Manpower – Re-defined. • Safety Plan – Draft Completed. • Installation Procedure – Draft Completed.

4. Project Schedule All major deliveries to McDonald are “Blacked-Out” between 22 December & 1 January

5. Manpower Synopsis • Core Crew – 5 men • 2 skilled in sheet metal/steel work. • 2 helpers. • 1 laborer. • On Demand – 1 to 8 more men • 1 dome operator. • 1 hoist operator. • 1 fork truck operator. • 3 to 5 rigging & load handling assistance.

6. Manpower Strategy • Temporary Hires vs. In-House Crew • Temporary Crew • Temporary Hire – 5 man crew. • Wolfpack • Other non-local source TBD. • HET/McD PP support during lift only – 8 men. • In-House Crew • UT Austin • 2 men. • HET • 1 man. • McD PP • 1-2 men TBD • Local Temporary Hire • 1-2 men. • HET/McD PP support during lift only - 8 men.

7. Manpower Strategy • Temporary Hire Pros & Cons

8. Manpower Strategy • In-House Crew Pros & Cons

9. Unfinished Business • Shutter Rail Hoist • Rigging and Steel Delivered. • Hoist Arrives just before Christmas Break. • Electrical hook-up to slip rings. • Some equipment may be need to be purchased for this. • Weather Curtain • Arrives by 17 December. • “Back Support” may be delayed until 2 January. • Equipment Rental • Man lifts • 80’ & 60’ • Welding Machine • Dumpster • Misc. Equipment and Supplies • To be purchased or ordered by next week.

10. Shutter Rail Hoist • Rigging • Lift as high as possible (30 feet) with Skyjack • Lift remaining distance (about 11 feet) with Come-alongs operated from Man Lifts • If that won’t work we need to rent a larger Skyjack for short time.

11. Shutter Rail Hoist Pass Flex-Conduit Through Dome Panel • Power Feed • 460V • 3 Phase • ~6 Amp • Slip Ring Capacity = 20A Ty-wrap to Cable Access by Man Lift

12. Shutter Rail Hoist • Manhole in dome panel for access to rail struts. • Access via JLG basket. • Can tie-off to basket while attaching/removing rigging to struts. • Installs 12 December.

13. Temporary Cover • Plywood & Frame Lumber Construction. • Lifted into position by hoist. • Drawn into the wall by nylon straps attached to the adjacent columns. • Tucks directly under bonnet at the top of the wall to repel rain fall. • Stows against basement wall in staging area.

14. Weather Curtain • Design Issues • Easy to deploy in moderate to high winds. • Deployable by standard 4 man crew in short period of time. • Able to withstand maximum survival wind load (120 mph ~ 50 psf). • Prevent water/dust intrusion.

15. Weather Curtain • Curtain works IFF: • It has good structural integrity. • It is not stretched tight. • Forces greatly magnified for small angles in the strain path. • A leverage problem. • Edge supports must have a lot of help. • Limited by holding power of a screw in 22 gauge sheet metal. • Back Support is necessary in wind speeds > ~35 mph.

16. Cargo Net

17. Weather Curtain

18. Weather Curtain • Rail & Trolley System

19. Back Support Concept – Aluminum Truss 2” x 2” x 1/8” Typical Total Weight ~ 60 lbs.

20. Aluminum Truss Ty-wraps to cargo net For stability. • Works OK … • Interference problems with X-bracing. • Prevents optimum location, but still OK. • Clamps to columns. • Wind buffeting likely a problem.

21. Back Support Concept • Air Bag • Normally pressurized with fans. • Can be made air-tight. • High Resistance to Puncture. • Will withstand pressures from highest wind loads (50 psf). • Cost comparable to truss system.

22. Air Bag 4-5 Nylon Strap Type Come-alongs Between Columns For Support • Excellent distribution of wind load. • Very low perimeter forces. • Works well with or without X-bracing. Bag is Hung in Place Then Inflated

23. Installation Procedure • Draft procedure available for review and comment.

24. 13 12 14 11 15 10 16 SECTION 1 9 2 8 3 7 6 4 5 Proposed Installation Sequence: 13, 12, 11, 10, 3, 4, 5, 6, 7, 8, 9, 2, 14, 15 Strategy: Learn early lessons in most isolated/least visible areas. Increased time to develop safety plan for Visitors.

25. Installation Procedure

26. Installation Procedure • Basement Road Staging Area

27. Installation Procedure • Opening Dimensions.

28. Use “Come-Alongs” on the 4 corners of the load to Draw the louvers into the Opening. Bent plates used to weld Louver to column.

29. Basic Tools

30. Electrical & Controls • Control Box • UT Austin (Mitch & Harvey) • Materials on order. • Assembled in Austin. • J-Boxes, Conduit, Wire, Hook-up Hardware • Materials ordered/installed by?

31. Electrical & Controls

32. Electrical & Controls

35. Electrical & Controls

36. Other Items • Scissor Lift appears to be history. • Rolling scaffold sufficient for installation. • On-going access??? • Project Office/Tool/Material Storage Area • Gang Box for tools may be sufficient. • Man Lift training. • Still needed???

37. Critical Risks • Weather • Schedule • Greatly mitigated by adoption of installation task by in-house crew. • Telescope Exposure • Mitigated by robust, quickly deployable weather curtain. • Safety • Motivation for risk is greatly reduced by relaxation of schedule/reduction of installation cost. • Weather exposure is a key concern, even in workable weather. • Protective gear a priority. • Unforeseen Factors • Mitigated by more reasonable schedule/lowered budget burn rate. • Down-time cost to respond to the unexpected is substantially reduced.

38. Action Items • In Preparation for 2 January 2002 • Order remaining hardware – UT Austin. • Order final component of Weather Curtain • The back-up support. • Order remaining Electrical/Controls hardware – HET? • Order hoist electrical hardware – HET? • Reserve/Set-up delivery of Man Lifts, Welder, Dumpster – McD PP? • Purchase necessary power tools – UT Austin?/McD PP?