order to form a walkway for the workers a planking member 45 used for this purpose is illustrated in fig8 the planking member 45 comprises a slab 47 having two angle flanges 48 and 49 that are secured to the underside 46 the gap 50 disposed between the angle flanges 48 and 49 forms a channel that accommodates the width of the extension member 25 so that the planking member 45 can be anchored to the scaffolding frame 29 without lateral movement after the bridge 17 has been constructed for the pendant sections 15 and 16 respectively it is then necessary to construct in situ a bridge 18 from the tier 16 of the pendant section 31 to the first tier 35 of the platen section 41 as illustrated in fig4 and thereafter to fabricate a bridge 19 from the first tier 35 to the second tier 36 of the platen section 41 as shown in fig7 the tubes of the platen section are approximately four feet apart therefore the legs 23 of the header member 22a should be spaced approximately five feet apart as illustrated in fig5 other than having a larger header member 22a the attendant procedures are then the same for the construction of bridges 18 and 19 planking member 45 is used to create a walkway for bridges 18 and 19 in a similar fashion as bridge 17 since other modifications and changes varied to fit particular operating requirements and environments will be apparent to those skilled in the art the invention is not considered limited to the.