It is difficult to haul large-size buildings because of their bulkiness and large mass. Thus, these structural units have to be made as transportable components which could be assembled by erection units at construction site.
Reinforced cement concrete structural units are manufactured at areas within the radius of truck haulage. They are generally transported as complete units by means of special transport vehicles. Sometimes bulky reinforced concrete structures are delivered to construction sites as sub-components. These are then assembled into heavy columns, beams, arches, shells and other large constructions.
Reinforced concrete trusses are pre-assembled in a horizontal position on special racks with the use of jigs securing elements in precise positions or in the design position on special stands. The assembly of trusses from two half-trusses in the design position is carried out on special purpose universal stands.
Pre-assembly can also be done in the zone of erection at ground level with the use of movable stands or along the line of erection work. Structural units may be cast for assembling frame structure to form a multi-storey building. Erection of structural units to form multi-storeyed pre-fabricated building is discussed in the next section.
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