Prefabrication is the Practice of assembling components of a structure in a factory or other Manufacturing site and transporting complete assemblies to the construction site where the structure is to / be located.
Process of Prefabrication :
example from house building illustrates the
process of prefabrication. The
Conventional method of building a house is to transport bricks
timber, cement, sand, Steel and construction aggregate etc., to the site, and
to construct the house on site from these materials.
In prefabricated Construction. Only the foundations are
constructed in this way while
sections of (walls, floors, roof are Prefabricated with window
& door frames included).-transported to the site lifted into place by a
crane and bolted together.
· Uses of
1. The most
widely used from of prefabrication in building and civil engineering is the use
of Prefabricated Concrete & prefabricated steel sections in structures
where a particulars part on form is repeated many line.
Concrete section in a factory brings the advantages of being able to re-use
moulds and the concrete cab be mixed on the spot without having to be
transported to and pumped wet on a congested construction site.
Steel sections reduces on site cutting and welding costs as well as the associated
techniques are wood in the construction of apartment slacks and housing
developments with repeated housing units.
technique is also used in office blocks, warehouses and factory buildings.
Steel and glass sections are widely used for the exterior of large buildings.
bridge elements and systems offer bridge designers & Contractors
significant advantages in terms of construction time, safety environmental
impact construct liability and cost.
can also help minimize the impact from bridge building.
bowers for mobile phone and other service often consist of multiple
Prefabricated has become widely used in the
assembly of aircraft and space craft with component such as wings and fuselage
sections after being manufactured in different countries or states from the
final assembly site
of Prefabrication :
supporting readymade components are used. So. The need for work shuttering and
scaffolding is greatly reduced.
time is reduced and buildings are completed sooner allowing an earlier return
of the capital invested.
· On site
construction and congestion is mini mixed.
control can be easier in a factory assembly line setting than a construction
can be located where skilled labour is more readily available and costs of
labour, power, materials, space and overheads are lower.
spend in bad weather or hazardous environments at the construction site is
of Prefabrication :
handling of Prefabricated components such as concrete panels or steel and glass
panels is required.
has to be paid to the strength and corrosion-resistance of the joining of
prefabricated sections to avoid failure of the joint.
leaks can form at joints in prefabricated components.
costs may be higher for Voluminow. Prefabricated sections than for the
materials of which they are made, which can often be packed more efficiently.
Prefabricated Structures require heavy-duty cranes & Precision measurement
and handling to place in position.
group of buildings from the same type of Prefabricated elements tend to look
drab and monotonous.
jobs are last.