1
Choosing the Choosing the RIGHTRIGHT
Formwork System Formwork SystemBCN 3423 - Timber/Formwork Design
Rinker School of Building Construction
University of Florida
2
Why worry about the Why worry about the Choice of Forming Choice of Forming
System?System?
Chek Lap Kok Airport (Hong Kong)
3
Concrete Frame CostsConcrete Frame Costs
Formwork: 50 - 70%
Petronas Tower
Rebar: 15 - 25%
Concrete: 15 - 25%
5
What Choices Do I What Choices Do I Have?Have?
Let’s focus on:Let’s focus on:• Walls
• Slabs
• Columns
8
Wall SystemsWall Systems (Prefabricated Panels)(Prefabricated Panels)
Prefab Steel Panel Prefab Alum. Panel
9
Prefabricated PanelsPrefabricated Panels• are durable for many reuses• simplify and reduce the labor required• studs and sheathing are preassembled in units
small enough to be handled• panels are set into position and tied together• wales, ties, and braces are then attached
• made of wood, metal, plywood with metal bracing, or glass fiber and plastic over wood
12
Ganged Panel FormsGanged Panel Forms• ranging up to 30x50 ft• large panels can be assembled flat on the ground
where it is easier to work• stripping is easier (stripped as a unit)• extra bracing is required to withstand the
handling stresses• are frequently used as “climbing” forms in high
wall construction
• small panels can be ganged together to form larger units
18
Slipform ConstructionSlipform Construction• vertical slipforms are moved upward by jacks• can be used for structures such as silos, and for
high rise elevator and stairway cores• working decks and finisher’s scaffolds are
attached to and carried up with the forms• has shorter construction time• appropriate for structures taller than 40 ft• not efficient where there are many projections
to the direction of slide
40
Factors in the ChoiceFactors in the Choice
• What you own
• Availability
• Initial price
• Total cost
41
Factors in the ChoiceFactors in the Choice• Experience of workers
• What will produce the desired results with the least amount of cost?
44
Factors in the ChoiceFactors in the Choice
• History with similar projects• Engineering expertise• Support services• Knowledge of support
personnel• Location
The Supplier:
45
Buy vs. RentBuy vs. Rent• Duration of project• Future usage• Cash flow• Return on
investment
Steel radius wall forms
Top Related