Prefabricated structure:
Various components of building such as column, beam, slab are casted in factory or in workshop & then transported to the site where it is assembled or connected with each other to construct the structure. This structure is called as prefabricated structure.
Advantages:
1) Large production of units & building components makes it affordable.
2) Reduction in time & cost due to factory made material.
3) Minimize erection time.
4) High quality of individual elements as they are factory made.
5) Has better surface finish & appearance.
6) Does not require framework.
7) Labour on site is reduced.
8) Reduce delays due to adverse weather conditions.
Disadvantages:
1) Design needs to be complete before casting commences.
2) Last minute alterations to the structure are impossible.
3) It is costlier than in – situ work; especially for small scale works.
4) Unsuitable if structural alteration might be needed in the future.
5) Units require care & protection while in storage, during transport & while handling on site.
6) Prestressed floor panels or beams can create problems with uneven camber in different units.
7) Unsuitable in case of structure which cannot be satisfactorily divided into small components.
8) Precast component may require excessively large site handling, hoisting equipment.
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