DIA Level 5 Observation Deck Demolition

Milender White (MW) partially demolished an existing slab on the pan observation deck at DIA. The deck, supported from below by structural steel beams and columns, was first saw cut into six sections. Rigging for each section was installed before final saw cuts were made. The team then lowered each section 40’ to the ground over a period of two days. The sections ranged in weight from 14,000 lbs. to 65,000 lbs.

MW analyzed three methods of completing the demolition. Following discussions with DIA, the engineer of record, and the subcontractors, we developed a work plan detailing the safest and most efficient approach.

• Selective demolition of structural members occurred prior to installing the new support structure. MW secured engineer approval of the plan to ensure sections being removed would not affect the stability of the remaining structure.
• As work would be performed 40 feet above the ground with no guardrail in place, all subcontractors and MW supervisors underwent Fall Hazard Training before being allowed on the observation deck. MW’s superintendent controlled access and 100% tie-off signs were posted.
• Both the crane and the sections being removed came within one foot of the support structure for the roof/tent due to tight site constraints. RMS Cranes identified all critical dimensions and developed a plan for how each piece would be removed. A dry run was conducted the morning of the demolition to ensure the plan would work.

Thanks to the extensive pre-planning and onsite supervision, the work was completed with no issues. Lowering full sections to the ground for demolition instead of demolishing the deck in place resulted in increased productivity, enhanced quality control, and zero injuries or incidents.