STEEL REINFORCEMENT 



267 



metal is particularly interesting, because, when bent into the 

 form shown in Fig. 12, it provides a self-centering material 

 that is useful for light roof construction. When bent in 

 this manner, the herring- ... _u 



bone expanded metal is 

 known to the manufac- 

 turers as trussit. The lon- 

 gitudinal ribs, as at a, give 

 it at least sufficient trans- 

 verse resistance to allow 

 the placing of a thin roof T^- 

 slab of concrete on it J 7L 

 without other centering or f '- 



support. 



Sheet-Metal Reinforce- 

 ment. The type of 

 metal reinforcement 

 known as Ferroinclave is used for making floor slabs 

 and for stair and roof construction. This reinforce- 

 ment consists of sheet metal that is bent into grooves, as 

 indicated in Fig. 13 (a), annealed sheet steel generally of 

 No. 24 U. S. gauge, being used in its manufacture. The 

 corrugations are made dovetailed in section so that the end 

 of one sheet can slip into another, as shown. The sheets 

 are 20f in. in width and 10 ft. in length. Fig. 13 (V) shows 

 how this type of metallic reinforcement is used in con- 

 structing a slab for a light roof. 



Lock-Woven and Tie-Locked 

 Wire Fabric. In Fig. 14 (a) is 

 illustrated the form of wire net- 

 ting known as lock-woven wire 

 fabric. The cross-wires of this 

 fabric are joined by means of a 

 staple of light wire, which is 

 bent so as to embrace the cross- 

 ing wires at their intersection. 



Another type of junction for cross-wires is shown in 

 Fig. 14 (fe), which illustrates the principal features of the 

 tie-locked fabric. Here, the cross-wires are secured, or 



FIG 



