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CONCERTE JUMP FORMBUILDING
CONSTRUCTION
BYMARK THOMPSON & THOMAS
SMITH
Uses of the jump form
system •Examples of Types of construction•Size of buildings•Types of systems Fly Ash Silo
Building Tower
Elevator Shaftor Building Core
Cooling Tower
ForPower Plant
Hoover Dam - Pat Tillman Bridge
One type of Jump form system in use today • Benefits of the
using jump forms
• Fast construction
• Self-climbing form work
• Small work force
Steps of Jump Form System
• Overview of the system
• How it is set-up• How it work on
jobsite
Steps of Jump Form System• Continued
Safety feature
• How the Jump Form beam works
• Jump Form beam
• Anchor bolts• Rollers
Anchor System
• Anchor bolts• What they do• Why they are
important• What type are
used
Willow Island Cooling Tower
Jump Form System
• Circa 1978
• Cathead Crane System• Static Line• Drum Hoist• Static line• Central Loading
Station
Elevation view of cooling tower at Willow Island
Plan view of cooling tower at Willow Island• Crane System• Catheads• Drum Hoist• Central
Loading Station
Willow Island Cooling TowerApril 27, 1978 • When things
go wrong?• Concrete
failure• Modification of
Equipment.• Bolts issues• Temperatures
variations
How this failure could have been prevent• Concrete
testing• Why it is
important• Where it
can be done
• Lab
What are the consequences
• 51 Dead• $85,000 = $1700 per dead worker•OSHA 10 willful violation & 10 serious•Cited on 2 OHSA violations•Dept. Of Justice, case thrown out