78 Concrete Silos 



The silo ladder is made of l^xl^x^ inch steel 

 angle runners and lxlx% inch steel steps, the joints 

 being electrically welded. It is secured to the concrete 

 wall by strap screws which are screwed into spiral 

 steel anchors imbedded in the wall during construc- 

 tion. When the wall is completed the temporary fillers 

 in the anchors are removed and the strap screws are 

 firmly inserted. The ladder is then bolted to the strap 

 screws and is ready for use. Ordinarily the ladder is 

 made up in 10-foot lengths, but sections of any length 

 may be cut. 



