Essay On Prefabrication

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Sources of literature refer to prefabrication, off-site construction, pre-assembly and modularisation concepts either respectively or collectively, (Haas et al., 2000).
Prefabrication -Haas et al (2000), prefabrication normally involves a single skill or trade, such as electrical, or piping, and this can be defined as “a manufacturing process, which generally takes place at a specialized facility, in which various materials are joined to form a component part of a final installation” (Tatum et al., 1987). Components manufactured off-site and is not a complete system can be referred to as prefabricated components. Furthermore Jaillon & Poon (2009) proceed to describe prefabrication as, a manufacturing process, commonly conducted at a specific facility, in which numerous materials are combined to form a component which is part of a final installation. The manufacturing process may be undertaken in different environments such as, a factory environment (factory prefabrication) or (site-prefabrication) on site under the open sky. The term off-site fabrication is utilized when prefabrication and pre-assembly is integrated (Jaillon & Poon, 2009). Gibb (1999) defines off-site prefabrication as a process which integrates prefabrication and pre-assembly. This process includes the design and the manufacture of units or modules, typically away from the work site, and their installation. “Off-site fabrication requires a project strategy that will change the orientation of the project process from construction to manufacture and installation”, (Gibb, 1999). (Klerk, 2013)
Modularisation – is generally referred to as the preconstruction of a complete system away from the job site which is then transported to site. The modules are large in size a...

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...fsite the construction activities can be broken up and completed simultaneously at various locations hence shortening the construction duration by the dispersing the work (Haas, O’Connor, Tucker, Eickmann, Fagerlund, 2000).

Disadvantages of prefabrication-
There are also several disadvantages and impacts to the use of prefabrication (prework). Transportation costs can be an issue due to offsite work (CII 1992). This is particularly true for large modularized sections that must need to be transported over long distances. Secondly, size constraints and limitations exist due method of travel, which directly leads to cost and schedule considerations. Thirdly, a need for increased engineering effort upfront (CII 1992) meaning that design work and extensive planning prior must be completed before prework can begin. (Haas, O’Connor, Tucker, Eickmann, Fagerlund, 2000).

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