CHAPTER 10 BAR SUPPORTS GENERAL Bar supports are imended to maintain L'le location of the reinforcing bars durt l. 11_,g 1hc coocre1e pl. xcmont They 11Jso ensure proper conercte CO¥Ct is provided ovc-r the rcinforocmcnt and proper design depth is achieved. Concn:le oovcr is very imporn<nt in concrete oomlruclion bc<;ause it provides a minimum outet dimension of conaeie for corrooion pro-ion and 6,eproofmg for the embed­ ded reinforcing steel. The height of a bar support is lakcn as the distance from the bottom of the leg, sand plate, or runner wire to the underside oflhc rciafor,:ing bar when lhc bar is p,-operty positioned on lhe suppon. A variation or plus or minus 1/8 inch from the specified oomioal height is a nom,al constro Clion IOletance. 81r )uppqrt:t.-re mtcndcd to S\lpport tht rcmforcin. steel and norrn.. l con SLru1,:uon lo$ and, w maints!ll th..:. li~cnl or the rcinforc:. Dg i,~cl.. Bar supports are uot intended to support hoses for concrete pumps, runways for coocrete bug Kies or similar loads. The lrooworker should follow the placing drawings and schedules for plu­ ing bar supports. Minimum petformance requirements for bar supports can be fowid in ANSI/CRSI RB4. 1 Standard for Supports for 1<,i11forcem,n1 Used in Concreie. If a Contractor or a reinforcing bar placing Sub-Contrae­ l Or wants bar supports furnished for special conditions, special arrangements must be made 10 ootain them. When b:ir support$ are furnished by a J'abrical Or as part or Ibo coo tract, pla,:. ing drawings should identify bar supports in two w,rys. l11e required place­ ment and location of bar supports should be graphically shown through the use of schematic placing diagrams and/or typical details. The r<quirod bar suppons should also be called out with a note that indicates the quantity provided, nominal height, type of support. spacing and possibly the location which enables the Ironworker to readily select the proper bar sup1>0ru for placing in the proper locations (Examples : 200 LP of2" BB placed as shown in Lypical beam elevation, 450 PCS of 4 1/2" IHC @48" Each Way, 50 10" IHC@48" in drop panels only, etc. ). Placing Reinforcing 81,.-1 0th &fltion 1 0-1 Section 609 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 6-9