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Falsework parallel truss bridges temporarily supporting deck segment box structures Overpass under construction over Interstate 5 in Burbank, California, in July 2021 [4] [5] Sixth Street Viaduct Falsework - Bent 11 Jump Span. Shown in the background is a concrete Y-Arm.
Centring [1], centre [2], centering [3] [4], or center [5] is a type of falsework: the temporary structure upon which the stones of an arch or vault are laid during construction. Until the keystone is inserted an arch has no strength and needs the centring to keep the voussoirs in their correct relative positions.
In the context of concrete construction, the falsework supports the shuttering molds. In specialty applications formwork may be permanently incorporated into the final structure, adding insulation or helping reinforce the finished structure.
Shoring is designed to prevent collapse where shielding is only designed to protect workers when collapses occur. Concrete-structure and stone-building shoring, in these cases also referred to as falsework, provides temporary support until the concrete becomes hard and achieves the desired strength to support loads.
The support towers may be built segmentally. Often this is accomplished using "slip-form" construction, where the falsework moves (slips) upward following sequential concrete "pours." The falsework uses the newly constructed concrete as the basis for moving upward. After the towers are built, a superstructure is built atop the towers.
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This requires the building of two bridges, the first a falsework to support the final span, which would be removed upon completion of the final span. It has also been criticized as both a less structurally robust design and with less predictable construction costs than other modern spans.
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