In precast construction system, the elements are casted at the factory in closed environment under quality supervision using state of the art machineries. The finished elements are transported to the site and erected.
Foundation for these buildings will be based on the nature of the soil.
• Pile foundation
• Open foundation
Elements in Foundation System
• Footing
• Pedestal
• Tie Beam
Footing:
Based on the nature of the soil, the type of foundation is decided. It will be either Pile & Pile Cap or Open Foundation.
Pedestal:
Top level of the pedestal is decided based on the finished floor level of the building. the pedestal is precast
with the foundation bolts or the dowel bars.
Tie Beam:
Tie beams connecting the columns are also pre-stressed and they will span between the columns
Note: Foundations depth is based on soil condition.
Step 1: Boring for Pile
Step 2: Concrete Filling
(a) Placing of Reinforcement cage and Concreting.
(b) Placing of Precast Pile cap
Step 3:Pedestal Erection
Step 4:Placing of Precast Tie Beam
Step 1: Excavation
Step 2: Placing of Precast Footing
Step 3:Pedestal Erection
Step 4:Placing of Precast Tie Beam Beam
Tie beams connecting the columns are also pre-stressed and they will span between the columns , which are about 8m to 9m.
Corbel in Pedestal Supports the Tie-Beam Connection to pedestal Which is grouted on erection.
Precast Tie Beam is also designed in a manner that it acts as a tie beam cum retaining wall between the two foundations.
• IS: 6006 – 1983 – Specification for Uncoated Stress relieved Strand for Pre-Stressed Concrete
• IS: 1343 – 1980 -Tensile Stress of Concrete, Elastic Deformation, Sections Uncracked in Flexure, Partial Safety Factors for loads.
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