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PRE-FABRICATED
STRUCTURES
1
What We Are Going To Learn
• What is mean by Prefabricated structure?
• Concept of prefabricated structure.
• Prefabrication & its components.
• Advantage and disadvantage of prefabrication.
What is prefabrication?
• Assembling components of a structure in
a factory or other manufacturing site,
and transporting complete assemblies or sub-
assemblies to the construction site where the
structure is to be located.
• The work is carried out in two stages,
manufacturing of components in a place other
than final location and their erection in position.
3
Stages of pre fabrication
4
• The Prefabrication as defined will be done in
two stages
• Manufacturing at factory condition and erection
of components at the required location.
• This requires certain stages of preparation.
They are
Casting.
Curing.
Transportation and erection.
Casting
5
• Precast components are casted with controlled
cement concrete in moulds of required shape
and sizes.
• The vibrator is used to vibrate concrete and
this removes any honeycombing inside the
components.
6
Curing
• After 24 hours of casting, the casted components
are released from the mould and transported to
curing tanks.
• Certain special components like railway sleepers
where high strength is required are steam cured.
7
8
Transportation and erection
• After complete curing is done the components
are transported to the site with heavy trucks and
erection will be done using cranes with skilled
labour force.
Prefab building components
Columns:
• A column is a vertical member carrying the beam and
floor loadings to the foundation.
• It is a compression member and therefore the column
connection is required to be proper.
• The main principle involved in making column
connections is to ensure continuity and this can be
achieved by a variety of methods. 11
Column to Column Connection
13
Beams: -
• Beams can vary in their complexity of design and
reinforcement from the very simple beam formed
over an isolated opening to the more common
encountered in frames where the beams transfer
their loadings to the column.
• Column and beam reinforcement, generally in the
form of hooks, are left exposed. The two members
are hooked together and covered with insitu concrete
to complete the joint.
14
15
Waffle unit for flooring / roofing: -
• These are suitable for roofs / floors spanning in
two directions.
• They are laid in a grid pattern.
• These units are cast in moulds.
• The saving achieved is not much. Also Shuttering
are complicated and costly.
• Time consumption for construction is less
16
17
SLAB TO BEAM CONNECTION
Advantages
• Saving in cost, material, time & manpower.
• Shuttering and scaffolding is not necessary.
• Installation of building services and finishes can
be done immediately.
• Independent of weather condition.
• Components produced at close supervision .so
quality is good
18
Disadvantages
• Handling and transportation may cause breakages of
members during the transit and extra provision is to
be made.
• Difficulty in connecting precast units so as to produce
same effect as monolithic. This leads to non-
monolithic construction.
• They are to be exactly placed in position, otherwise
the loads coming on them are likely to get changed
and the member may be affected. 19
This Presentation is Brought to you
by
An Civil Engineering Blog

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Prefabricated Structure and its installation process

  • 2. What We Are Going To Learn • What is mean by Prefabricated structure? • Concept of prefabricated structure. • Prefabrication & its components. • Advantage and disadvantage of prefabrication.
  • 3. What is prefabrication? • Assembling components of a structure in a factory or other manufacturing site, and transporting complete assemblies or sub- assemblies to the construction site where the structure is to be located. • The work is carried out in two stages, manufacturing of components in a place other than final location and their erection in position. 3
  • 4. Stages of pre fabrication 4 • The Prefabrication as defined will be done in two stages • Manufacturing at factory condition and erection of components at the required location. • This requires certain stages of preparation. They are Casting. Curing. Transportation and erection.
  • 5. Casting 5 • Precast components are casted with controlled cement concrete in moulds of required shape and sizes. • The vibrator is used to vibrate concrete and this removes any honeycombing inside the components.
  • 6. 6
  • 7. Curing • After 24 hours of casting, the casted components are released from the mould and transported to curing tanks. • Certain special components like railway sleepers where high strength is required are steam cured. 7
  • 8. 8
  • 9. Transportation and erection • After complete curing is done the components are transported to the site with heavy trucks and erection will be done using cranes with skilled labour force.
  • 10.
  • 11. Prefab building components Columns: • A column is a vertical member carrying the beam and floor loadings to the foundation. • It is a compression member and therefore the column connection is required to be proper. • The main principle involved in making column connections is to ensure continuity and this can be achieved by a variety of methods. 11
  • 12. Column to Column Connection
  • 13. 13 Beams: - • Beams can vary in their complexity of design and reinforcement from the very simple beam formed over an isolated opening to the more common encountered in frames where the beams transfer their loadings to the column. • Column and beam reinforcement, generally in the form of hooks, are left exposed. The two members are hooked together and covered with insitu concrete to complete the joint.
  • 14. 14
  • 15. 15 Waffle unit for flooring / roofing: - • These are suitable for roofs / floors spanning in two directions. • They are laid in a grid pattern. • These units are cast in moulds. • The saving achieved is not much. Also Shuttering are complicated and costly. • Time consumption for construction is less
  • 16. 16
  • 17. 17 SLAB TO BEAM CONNECTION
  • 18. Advantages • Saving in cost, material, time & manpower. • Shuttering and scaffolding is not necessary. • Installation of building services and finishes can be done immediately. • Independent of weather condition. • Components produced at close supervision .so quality is good 18
  • 19. Disadvantages • Handling and transportation may cause breakages of members during the transit and extra provision is to be made. • Difficulty in connecting precast units so as to produce same effect as monolithic. This leads to non- monolithic construction. • They are to be exactly placed in position, otherwise the loads coming on them are likely to get changed and the member may be affected. 19
  • 20. This Presentation is Brought to you by An Civil Engineering Blog