Concrete slab openings up to four feet in maximum dimension receive two number five diagonal reinforcing bars placed at mid-depth of the slab at each corner. All top and bottom slab bars interrupted by the opening are replaced with equal additional reinforcing distributed evenly on each side. The replacement bars extend beyond the opening to achieve a required Class B lap splice length per bar size. Boxed-out openings, boxed recesses, and pipe sleeve clusters are treated as framed slab openings.
PLAN SEE NOTE 1 (2)#5 AT MID-DEPTH OF SLAB, TYP AT EACH CORNER OPENING: SQUARE, RECTANGULAR OR ROUND (MAX DIMENSION = 4'-0") TYP TYPICAL SLAB REINF NOTES: 1. ALL TOP AND BOTTOM SLAB BARS INTERRUPTED BY OPENING SHALL BE REPLACED BY ADDITIONAL REINFORCING EQUAL TO THAT INTERRUPTED. PLACE HALF OF THE ADDITIONAL REINFORCING ON EACH SIDE OF THE OPENING AND EXTEND TO LENGTH REQUIRED TO ACHIEVE CLASS "B" LAP SPLICE (BEYOND OPENING) PER BAR SIZE. 2. BOXED-OUT OPENINGS, BOXED RECESSES AND PIPE SLEEVE CLUSTERS SHALL BE TREATED AS FRAMED SLAB OPENINGS. 2'-6" TYP 2'-6" TYP 3" TYP TYP 1 1/2" CLR
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