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FP-96 English Version - Eastern Federal Lands Highway Division

FP-96 English Version - Eastern Federal Lands Highway Division

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Section 562Table 562-3Minimum Form/Support Release CriteriaStructural ElementPercentofSpecified28-DayStrength(fk c )MinimumNumberof DaysSinceLastPour(a) Columns and wall faces(not yet supporting loads)(b) Mass piers and mass abutments(not yet supporting loads) except pier caps50 350 3(c) Box girders 80 14(d) Simple span girders, T-beam girders, slabbridges, cross beams, caps, pier caps not continuouslysupported, struts, and top slabs of concretebox culverts.(e) Trestle slabs where supported on woodstringers(f) Slabs and overhangs where supported on steelstringers or prestressed concrete girders80 1470 1070 10(g) Pier caps continuously supported 60 7(h) Arches, continuous span bridges, rigid frames 90 21Remove all falsework material. Remove falsework piling to at least 2 feetbelow the surface of the original ground or original stream bed. Wherefalsework piling is driven within the limits of ditch or channel excavation,remove the piling to at least 2 feet below the bottom and side slopes of theexcavated areas.Leave the forms for footings constructed within a cofferdam or crib in placewhen their removal would endanger the safety of the cofferdam or crib, andwhere the forms will not be exposed to view in the finished structure.Remove all other forms whether above or below groundline or water level.490

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