Formwork/Shuttering: CMR College of Engineering and Technology
Formwork/Shuttering: CMR College of Engineering and Technology
Formwork/Shuttering: CMR College of Engineering and Technology
• DEFINITION OF FORMWORK
• REQUIREMENTS OF A GOOD FORMWORK
• CA TEGORIES OF FORMWORK
• TYPES OF FORMWORK
• PROCESS OF FORMWORK CONSTRUCTION
• DESHUTTERING
• FA ILURE OF FORMWORK
• SA FETY PRECAUTION
DEFINITION OF FORMWORK
modular, which are designed for speed and efficiency. The main
types of formwork systems in used now are
Slip formwork
Tunnel formwork
SLIP FORMWORK
ENGINEERED/PRE-FABRICATED FORMWORK: This formwork is
built out of prefabricated modules with a metal frame (usually steel
or aluminium) and covered on the application (concrete) side with
material having the wanted surface structure (steel, aluminium,
timber, etc.).
Major objectives considered in formwork
Quality
Safety
Economy
Quality:
Forms must be designed and built with sufficient
stiffness and accuracy so that the size, shape, position, and
finish of the cast concrete are maintained .
Safety:
Forms must be built sufficient strength and factor of
safety so that they have the capable of all supporting
loads.
Economy:
Forms must be built efficiently, minimizing time and
cost .
TYPES OF FORMWORK MATERIALS
TIMBER
STEEL
PLASTIC
ALUMINIUM
TIMBER FORMWORK:
Easy to disassemble.
Easy to be fixed.
Light weight.
Reusable.
Chemical resistant.
Expensive at first.
It consists of
-Timber sheeting
-Vertical posts
-Horizontal member
-Rackers
-Stakes
-Wedges
Wall formwork and its components
Wall formwork
FORMWORK FOR COLUMN
It consists of
-Side and end planks
-Yoke
-Nuts and bolts
When all the column formwork is securely propped a final check must be ma
de for plumb and column alignment before and immediately after the
concrete has been poured and vibrated.
Formwork for staircase
Vibration.
Inadequate bracing.
Passing traffic.