How to select the Formwork System
Why worry about the Choice of Forming System?
Refer ppt below.
What Choices Do I Have?
Wall Forming
- Walls
- Loose Framing
- Prefabricated Panels
- Crane Set Gangs
Wall Systems (Prefabricated Panels)
- Prefab Steel Panel
- Prefab Alum. Panel
- 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
Ganged Panel Forms
- ranging up to 30×50 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
Slipform 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
Factors in the Choice of formwork system
- What you own
- Availability
- Initial price Know the House Estimation cost
- Total cost
- Number of uses
- Desired finish
- Site conditions
- Experience of workers
- What will produce the desired results with the least amount of cost?
- Crane
- Schedule
- Building design
The Supplier:
- History with similar projects
- Engineering expertise
- Support services
- Knowledge of support personnel
- Location
Buy vs. Rent
- Duration of project
- Future usage
- Cash flow
- Return on investment