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PREFAB METHODS
Presented by:
1. Eyad Reda
2. Ahmed Ezzat
3. Abdelrahman Alaa El Din
4. Hussam El Din Ayman
5. Omar Khaled Niemat
6. Mahmoud Omar
CONSTRUCTION PREFABRICATION
▪ Three main steps
1. Manufacturing components off-site (Factories or workshops)
2. Transport components to site
3. Assembly at needed positions
OFF-SITE
fabrication
Transport to site Assemble
CONSTRUCTION PREFABRICATION
▪ IF divided according to type of materials used
Prefab
Timber
framing
Steel
framing
Sandwich
paneling
Concrete
CONSTRUCTION PREFAB
▪ Direct Applications of Prefab
Skyscrapers
Modular
Houses
Bridges
TIMBER WOOD FRAMING
▪ Box Frame
▪ Cruck Frame
▪ Aisled Frame
PANELIZED WOOD FRAMING
▪ All-wood panelized framing
▪ Hybrid panelized framing
SANDWICH PANELS
▪ Honeycomb sandwich panel
▪ Aluminum composite panel (ACP)
The Earth’s Epcot Spaceship
CONCRETE
PRE-STRESSED CONCRETE
▪ How ?
▪ Pre-tensioned tendons instead of
normal steel bars
▪ Allow concrete to withstand
tension by friction
▪ Benefits:
▪ Longer spans
▪ Thinner slabs ((Cost-Saving))
▪ Fewer joints between spans
PRECAST SLABS
▪ Solid Flat (Traditional)
▪ Hollow Core Flat
▪ High-rise, Bridges
▪ Lower cost, lower weight and fast
assembly
▪ Single T
▪ Double T
▪ Up to 24 m span or more
▪ Flooring systems in garages, Bridges
PRECAST BUILDING SYSTEMS
▪ Large Panel System
▪ Large wall and floor panels
▪ BOX-like Rooms
▪ Horizontal and Vertical Joints
▪ Lift slab system with walls
▪ Precast Columns (Two stories High)
▪ Precast RC slabs joined by special
joints to columns
PRECAST BUILDING SYSTEMS
▪ Frame System
▪ Beam-Column Junctions
▪ Corbels at columns for beams
STEEL FRAMING
▪ Super-structure Skeleton
▪ Vertical I-shaped Columns and
Horizontal I-beams
▪ Rectangular grid supporting
floors , walls…….etc.
▪ Cased by Fire-Resistant Coating
or concrete layer
▪ Skyscrapers became possible
PREFABRICATION IN SKYSCRAPERS
• You can think of using prefabricated materials in the building of
skyscrapers as “ some LEGO® assembly” on an immense and
monumental scale.
• All prefab assemblies are transported to site and lifted by cranes to
needed positions then joined by workers one by one.
PREFABRICATED SKYSCRAPERS
• Mini Sky City:
-57 stories.
-19 atriums with 10 m tall
each.
-4,000 people working spaces.
-800 households.
( Location : Changsha, China.)
MINI-SKY CITY
SEGMENTAL BRIDGES
▪ Support towers at sides
▪ Concrete Prefab segments lifted
by cranes
▪ Attached together by steel
reinforcements
▪ A popular example is
▪ Mike O'Callaghan–Pat Tillman
Memorial Bridge
MODULAR HOUSES
▪ Full rooms or floors are just
ready for assembly
▪ Cranes assemble the house in
few days
▪ Advantages:
▪ Cost Saving
▪ Time-efficient
▪ Fewer Crews
▪ No site disturbance
▪ No weather delays
ADVANTAGES & DISADVANTAGES
BASIC CRITERIA
▪ Construction Time
▪ Construction Cost
▪ Quality
▪ Site Complexity
ADVANTAGES
Construction Time:
•Indoor Fabrication
•Independence of weather conditions
Construction Cost:
•Bulk orders
•Less Indirect Costs
•Fewer Labor
•Less holding costs
Quality:
•Ongoing Quality Surveillance
•Stable production Conditions
Site Complexity:
•Less overlapping activities
•Standard construction method
DISADVANTAGES
Construction Time
Construction Cost:
•Transportation Cost
•Professional Labor
•Heavy Duty Machinery
Quality:
•Consistency
•Untrained Labor
•Leakage
Site Complexity:
•Limited Working Areas
•Limited Transportation Routes
THANK YOU

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