92 



Concrete Silos 



curvature of each section. The ends of each section 

 are made with slideable edges and are provided with 

 turnbuckles for con- 

 tracting and expand- 

 ing the forms. 



The form is raised 

 by means of jacks 

 operated from the 

 platform. The rein- 

 forcing rods run 

 through the jacks. 

 At the bottom of 

 the jack is a collar 

 clamped to the rein- 

 forcing rod which 

 supports the jack. 

 The extension yoke 

 which is attached to 

 the inside and out- 

 side form is bolted to 

 the stationary nut of 

 the jack. By turning 

 the screw the nut is 

 pushed up, pulling 

 the form with it. 



These forms pro- 

 vide for building 6 

 to 10 feet of wall in 

 height per day. 



Intermittent metal doors are used in this system. 

 They are 20x22 inches in size, and are made entirely of 

 cast iron except the hinges, which are mild steel. The 

 frames are also of cast iron, and carry a groove for 



Building' a Silo with Martin Forms 



