Ring Wall Ventilation System

Readiness Review11 December 2001

John GoodProject Engineer

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.

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.

Project Schedule

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

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.

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.

Manpower Strategy Temporary Hire Pros & Cons

Pros Cons

Dedicated work force. Expensive, and we still take on cost & schedule risk.

Faster completion (Approx. 10 weeks)

Downtime cost due to Weather. Crew paid regardless, and not easily redirected to other tasks.

Crew motivated to take weather safety risks to accomplish task on schedule.

Could burn full budget, and still not finish installation.

Weather opportunities may force McDonald PP assistance on weekends for louver lift (additional cost to project).

Manpower Strategy In-House Crew Pros & Cons

Pros ConsMuch lower cost & our staff doing highest priority project.

Project duration longer (Approx. 20 weeks - due to work only on weekdays & anticipation of poor weather.)

Downtime risk due to weather is low – we have other things in the queue (or can just go home). Loss of schedule doesn’t translate to significant loss of budget (some loss due to rental equipment standing idle).

Other tasks get ignored in good weather (unless decision to suspend installation for the day for some emergency).

Much less pressure to assemble crew for lift on weekends with good weather.

Staff not fully available for other projects.

Easier to say “no” to unsafe working conditions.

Project money, acquired equipment and experience stays on the mountain for other projects, both HET completion and others, e.g. 2.7M Dome Vents.

Can pay for McD PP labor cost thus adding to PP budget.

Tasks are well defined and within our abilities.

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.

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.

Shutter Rail Hoist

Power Feed 460V 3 Phase ~6 Amp

Slip Ring Capacity = 20A

Pass Flex-ConduitThrough Dome Panel

Ty-wrap to CableAccess by Man Lift

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.

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.

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.

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.

Cargo Net

Weather Curtain

Weather Curtain

Rail & Trolley System

Back Support Concept – Aluminum Truss

2” x 2” x 1/8” Typical

Total Weight ~ 60 lbs.

Aluminum Truss

Works OK … Interference problems with X-bracing.

Prevents optimum location, but still OK. Clamps to columns. Wind buffeting likely a problem.

Ty-wraps to cargo netFor stability.

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.

Air Bag

Excellent distribution of wind load.

Very low perimeter forces.

Works well with or without X-bracing.

4-5 Nylon StrapType Come-alongsBetween ColumnsFor Support

Bag is Hung in PlaceThen Inflated

Installation Procedure

Draft procedure available for review and comment.

SECTION 1

2

3

45

6

7

8

9

10

11

1213

14

15

16

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.

Installation Procedure

Installation Procedure Basement Road Staging Area

Installation Procedure

Opening Dimensions.

Use “Come-Alongs” on the4 corners of the load toDraw the louvers into theOpening.

Bent plates used to weldLouver to column.

Basic ToolsItem Quantity

Cordless Drill Motors 2

Circular Saw 2

Saws All 2

Hand Grinder 2

Come-Along 4

Fire Blankets 6

Protective Equipment 5 sets

Paint Repair Equipment

Gang Box 1

Chop-Saw 1

Cutting Torch 1

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?

Electrical & Controls

Electrical & Controls

Electrical & Controls

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???

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.

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?