Formwork Is The Term Given To Either Temporary Or Permanent
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Formwork is the term given to either temporary or permanent moulds into which concrete or similar materials are poured. In the context of concrete construction, the falsework supports the shuttering moulds. Formwork comes in three main types: 1. Traditional timber formwork. The formwork is built on site out of timber and plywood or moisture-resistant particleboard. It is easy to produce but time-consuming for larger structures, and the plywood facing has a relatively short lifespan. It is still used extensively where the labor costs are lower than the costs for procuring re-usable formwork. It is also the most flexible type of formwork, so even where other systems are in use, complicated sections may use it. 2. Engineered Formwork systems. This formwork is built out of prefabricated modules with a metal frame (usually steel or aluminum) and covered on the application (concrete) side with material having the wanted surface structure (steel, aluminum, timber, etc.). The two major advantages of formwork systems, compared to traditional timber formwork, are speed of construction (modular systems pin, clip, or screw together quickly) and lower life-cycle costs (barring major force, the frame is almost indestructible, while the covering if made of wood; may have to be replaced after a few - or a few dozen - uses, but if the covering is made with steel or aluminum the form can achieve up to two thousand uses depending on care and the applications). 3. Re-usable plastic formwork. These interlocking and modular systems are used to build widely variable, but relatively simple, concrete structures. The panels are lightweight and very robust. They are especially suited for low-cost, mass housing schemes moladi. Stay-In-Place formwork systems. This formwork is assembled on site, usually out of prefabricated insulating concrete forms. The formwork stays in place (or is simply covered with earth in case of buried structures) after the concrete has cured, and may provide thermal and acoustic insulation,
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Transcript of Formwork Is The Term Given To Either Temporary Or Permanent
Formwork is the term given to either temporary or permanentmoulds into which concrete or similar materials are poured.In the context of concrete construction, the falseworksupports the shuttering moulds.
Formwork comes in three main types:
1. Traditional timber formwork. The formwork is built onsite out of timber and plywood or moisture-resistantparticleboard. It is easy to produce but time-consuming forlarger structures, and the plywood facing has a relativelyshort lifespan. It is still used extensively where the laborcosts are lower than the costs for procuring re-usableformwork. It is also the most flexible type of formwork, soeven where other systems are in use, complicated sections
may use it. 2. Engineered Formwork systems. This formwork is builtout of prefabricated modules with a metal frame (usuallysteel or aluminum) and covered on the application (concrete)side with material having the wanted surface structure(steel, aluminum, timber, etc.). The two major advantages offormwork systems, compared to traditional timber formwork,are speed of construction (modular systems pin, clip, orscrew together quickly) and lower life-cycle costs (barringmajor force, the frame is almost indestructible, while thecovering if made of wood; may have to be replaced after afew - or a few dozen - uses, but if the covering is madewith steel or aluminum the form can achieve up to twothousand uses depending on care and the applications). 3. Re-usable plastic formwork. These interlocking andmodular systems are used to build widely variable, butrelatively simple, concrete structures. The panels arelightweight and very robust. They are especially suited forlow-cost, mass housing schemes moladi.
Stay-In-Place formwork systems. This formwork is assembledon site, usually out of prefabricated insulating concreteforms. The formwork stays in place (or is simply coveredwith earth in case of buried structures) after the concretehas cured, and may provide thermal and acoustic insulation,space to run utilities within, or backing for finishes.
Stay-In-Place structural formwork systems. This formwork isassembled on site, usually out of prefabricatedfiber-reinforced plastic forms. These are in the shape ofhollow tubes, and are usually used for columns and piers.The formwork stays in place after the concrete has cured andacts as axial and shear reinforcement, as well as serving to
confine the concrete and prevent against environmentaleffects, such as corrosion and freeze-thaw cycles.
At some projects, construction workplace health and safety inspectors were accompanied by ergonomists who focused on:
Low-rise forming
Access to the excavated site Minimizing the distance between where forms are stored and and where they are
assembled
Erection of work platforms
Stripping of forms
Moving interior wall forms to exterior, and
Carrying forms to next lot
High-rise forming
Tying of rebar in columns Methods used for tying wall rods; and
Hammering
Inspectors visited projects within all construction sectors, including:
Industrial commercial and institutional Residential (high- and low-rise)
Road building and sewer/watermains, and
Bridge rehabilitation
Formsare moulds into which concrete or other material is placed.
Formworkis a system of forms connected together.
Falsework(in relation to a form or structure) comprises the structural supports and bracing for all or part of the form or structure while it is being built.
