Full prefab open system
In this system, almost all the structural components
are prefabricated. The filter walls may be of bricks on of any other local
This system is based on the use of large prefab
components. The components used are precast concrete large panels for walls
floors roofs balconies, staircases etc. The casting of the components could be
at the sit on off the sit.
Depending upon the context of prefabrication, this
system can also land itself to partial prefab system ad full prefab system.
scheme with precast large panel walls can be classified as
wall system. Cross wall system:-
In this system the cross walls
are load bearing walls. The façade walls are non-load bearing.
This system's suitable.
In this system, cross walls are
non-load bearing, longitudinal walls are load bearing. This system is suitable
for low rise buildings.
combination of the above systems with all load bearing walls can also be
Precast concrete walls could be :-
Walls. Homogenous walls:-
The walls could be solid, hollow
or ribbed. Non-homogenous walls:-
the structural functions of the walls. The walls could be classified as
Based on their locations and functional requirements the walls
are further classified as.
walls, which can be load bearing or non-load bearing depending upon the layout.
They are usually non-homogenous walls of sandwiched type to impart better
walls, which provides resistance against vertical loads, horizontal loads, fire
etc. and are normally homogenous.
Depending upon the composition of units, precast
flooring units could be homogenous or non-homogenous.
1. Homogenous foors could be solid slabs, cored
slabs, ribbed or waffle slabs.
2. could be multilayered ones with combinations of
light weight concrete or reinforced/ pre stressed concrete, with filled blocks.
Depending upon the way the loads are transferred the precast
fllors could be classified as way or two way systems.
One way system:-
One way system transfers loads to
the supporting members in one this direction only. The precast elements of this
category are channel slabs.
Hollow core slabs, hollow blocks
ad buttons plank system, channels and tiles system. light weight cellular
concrete slat etc.
Transfer loads in both the
directions imparting loads on the four edges. The precast element under thus
category are room sized panels two way ribbed or waffle slab system etc.
Staircase system consists of
single flights with in built risers and treads in the element only the flights
are normally unidirectional, transferring the loads to supporting landing slbas
or load bearing walls.
Box type system:-
In this system, room size units
are prefabricated and erected at site. This system derives its stability and
stiffness from the box make rigid connection among themselves.
unit rests on plinth foundation which may be of conventional type of precast