This document discusses prefabrication systems and their advantages. It defines prefabrication as assembling building components in a factory and transporting them to the construction site. Prefabrication can reduce construction costs by 30%, time by 35%, and defects by 60% compared to traditional methods. It also lists principles of prefabrication like designing for modularity, simplifying connections, and minimizing materials. Prefabrication is described as more efficient, lower cost, and reducing waste and manpower compared to conventional construction. Examples of prefabricated building elements like walls, roofs, and floors are also provided.

1. WELCOME

2. PREFABRICATION SYSTEM
SRI VENKATESHWARAA COLLEGE OF
ENGINEERING AND TECHNOLOGY
NAME: R.ARUN
DEPT: CIVIL
CONTACT: 8870710761
EMAIL: arun6291@gmail.com
NAME: N.SATHISH
DEPT: CIVIL
CONTACT:9597074174
EMAIL:sknv25@gmail.com

3. What is Prefabrication?

4. Prefabrication is the practice of assembling components of a
structure in a factory or other manufacturing site, and transporting the
complete assemblies or sub-assemblies to the construction site where
the structure is to be located.

5. Why prefabrication systems are
used?

6. •50% reduction in the amount of water used for construction
of a typical house.
•30% reduction in construction costs.
•35% reduction in construction time.
•60% reduction in defects on completion.
•Eco-friendly.

7. PRINCIPLES OF PREFABRICATION TECHNIQUES:
• Design for prefabrication, preassembly and modular construction.
• Simplify and standardize connection details.
• Simplify and separate building systems.
• Consider worker safety during deconstruction.
• Minimize building components and materials.
• Select fittings, fasteners, adhesive and sealants that allow for quicker
assembly and facilitate the removal of reusable materials.
• Reduce building complexity.
• Design for reusable materials.
• Design for flexibility and adaptability.

8. SCOPE OF PREFABRICATION :
Prefabrication is more efficient, low cost, Time saver, Reduce the
Wastage, Reduce the Manpower, Maintanance is less, and can be reused in
the material stream.

9. FIRST PREFABRICATION IN INDIA
• Prefabrication in India began with the emergence of the Hindustan Housing
Factory.
• The company was developed by the first Prime Minister of India, Pandit
Jawaharlal Nehru, from West Pakistan in 1950s.
• The Hindustan Housing Factory produce the pre-stressed concrete railway
sleepers to replace dilapidated wooden sleepers on Indian Railways.
• Then, The company changed its name known as the Hindustan Prefab Limited or
HPL.

10. TRADITIONAL CONSTRUCTION METHODS
• Traditional construction techniques involve the use of timber moulds or shuttering
and scaffolding for roof spans and other structural systems.
• These temporary timber structures have a short lifespan.
• Requires more maintanance.
• Requires more manpower than the Prefabrication System.

11. NECESSITY FOR PREFABRICATION
• Higher quality products for clients
• Maintanance cost is low.
• Improved productivity and profitability for contractors
• Environmental benefits associated with its use.
• Prefabrication System provides satisfactory results to the construction Industry.
• It found that wastage generation can reduce up to 100% after adopting
prefabrication, in which up to 84.7 per cent can be saved on wastage reduction.

12. PREFABRICATION AS ‘LOW COST HOUSING’
• Self supporting, shuttering and scaffolding is eliminated with a saving in shuttering
cost.
• The mould for the precast components can be used for large number of repetitions
thereby reducing the cost of the mould per unit.
• Time is saved by the use of precast elements which are casted off-site during the
course of foundations being laid.
• Similar types of components are produced repeatedly, resulting in increased
productivity and economy in cost too.
• The work at site is reduced to minimum, thereby, enhancing the quality of work,
reliability and cleanliness.

13. ADVANTAGES OF PREFABRICATION OVER
CONVENTIONAL METHODS:
• Not endanger bio-reserves and be non-polluting.
• Be self sustaining and promote self reliance.
• Recycle polluting waste into usable materials.
• Utilize locally available materials.
• Utilize local skills, manpower and managing systems.
• Benefit local economy by being income generating.
• Utilize renewable energy sources.
• Be accessible to people.
• Be low in monetary cost.

14. PREFABRICATION IN WALLS:
• The number of the bricks or blocks that are broken into different sizes to fit into
position at site is very large, which results in wastage of material poor quality.
• Low density bigger size wall blocks using industrial wastes like blast furnace slag
and fly ash.
• They are also used as Weathering and Damp proofing
• They provide Sound and Thermal insulation.

15. PREFABRICATION IN ROOFS AND FLOORS:

18. PREFABRICATION AS DISASTER RESISTANT
• The greatest advantage of prefabricated buildings is being earthquake-resistant and
light as they are steel constructions.
• The short manufacturing period and providing fast mounting.
• Suitable for all Weathering Conditions.
• Prefabrication is good for Marine Environment.

19. CASE HISTORIES:
Demonstration Housing Project at Laggerre, Bangalore, Karnataka.
Project Profile:-
• Name of scheme: VAMBAY – Ministry of HUPA
• Location of site: Laggere, Bangalore
• No. of Units: 252 (Ground +2)
• Built-up area of a unit: 275sq.ft
• Unit consist of: 2 rooms 1 kitchen, 1 bath room, 1WC
• Cost per unit: Rs.60000

20. Cost per Sqft: Rs.418/-
Nodal State Agency: Karnataka slum clearance Board
Technologies / Specification Foundation
• Random Rubble Stone Masonry
Walling
• Solid Concrete blocks for 200mm thick walls
• External Cement plaster
• White wash on internal walls
• Water proof cement paint on external walls

21. Roof/Floor
• RC Filler slab using clay bricks as fillers in ground
• RC slab for second floor
• IPS flooring
Doors & Windows
• Pre-cast RCC door frames
• Coir polymer Door shutters
• Steel Sheet window shutters
• Clay jalli in ventilators

22. CHARACTERISTICS OF PREFABRICATION SYSTEM
• Light weight
• Thermal insulation property
• Easy workability
• Durability in all weather conditions
• Non combustibility
• Economy in cost
• Easy availability
• Sound insulation

23. ADVANTAGES OF PREFABRICATION SYSTEM
• High capacity
• Factory made products
• Shorter construction time
• Independent of adverse weather conditions
• Opportunities for good architecture
• Healthy buildings
• Environmentally friendly way of building
• Cost effective solutions
• Safety
• Increase in the quality
• Reduction of construction waste

24. LIMITATIONS OF PREFABRICATION SYSTEM
• Heavy-duty cranes, Precision measurement and handling.
• Careful handling
• Attention strength leak and corrosion- resistance at joints.
• Similarly, leaks can form at joints.
• Size of the units
• Location of window openings has a limited variety
• Transportation cost

25. CONCLUSION
A review has been carried out in this paper to importance and
applications building using prefabricated techniques in India. The main
advantages for prefabrication construction is reduce Manpower,
Maintanance, reduce cost and time. It takes one step above the Construction
Industry. The Precast Concrete technology has already arrived in India due to
large size projects, need for quality construction with speed & reduced labour
force. Prefabricated components speed up construction time, resulting in
lower labor costs. Prefabrication allows for year-round construction, work is
not affected by weather delays. Prefabrication is usually applied in structures
which are used repeatedly and can be standardized such as; mass housing,
sheds, bus stands, security cabins, site offices, and road bridges. In future, the
Prefabrication system will be used in 70% of construction sites due to the fast
growing population and Economy.

26. Thank you!