When hoi$ting bundles or n:infon:iog ban roughly 30 feet or longer, depend­ ing on the bar size (smaller bars flex more), it may be necessary to use a spn,a<ler beam,.. hown in Fig. 8-3, so tho n:inforcing bars will not bend excessily. A,prcad<r bc.,m allow, thc 1011d 10 be lifted vcmcully wllhout inducmgahori,. ootal fortt io!Qtbe bunclleofbi= Thcl<:ogtb ortb-der bnm,h<>uld be or lew onc-ll>lf l11e kn_gd, of th< rcmfo,. :,ng \Nm'i 111 tho bundle. The 1>n:adcr beam should be an OSHA or State-approved lifting device, witl\ the lood rating clearly p OOled on tho spreader beam. Fig. 8-J Crano, Chokors ond Spreodor Boam When bundles of rcinfon:ing bani are being hoisted, a taa lino shall be used unless its use creates an unsafe condition (OSHA, Pari 1926, Section 1926. 150J(g)(6)(iii)). A lag line is to be attached IO one or both ends of tho bundle for the purpose of guiding the lood as it is hois!Zd. Co11W:Oliooal rope is most commonly used for this purpose. Safe hoisting requires a skilled op­ enitor hanclli111 the power equipmen The crane opc,. 10r normally ta Jces di­ rections from the anlhorizcd signal person Ii) means of hand signals. Then: ""'o standord set of hand sign,1s thut arc ob. <CM:d by all crane opcrat Ot'S (see Fig, 8-4). On some projects, a radio headset is used to relay directions t0 the crane operator. Placing Rolnlon: Bani-10th Edition 8-7 Saf~ty Kool<S WUh Gatn J 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 35 36 37 38 39 6-9