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