PRACTICAL SILO CONSTRUCTION 23 



FOUNDATION WITH FLOOR BELOW GROUND- 

 LEVEL 



At Fig. 2 is shown the usual type of silo founda- 

 tion, where the floor-level is below the ground-level, 

 which is designated by a a in illustration. The 

 footing course is shown by the dotted lines 6 6, and 

 at all times forms a part of the foundation-wall to 

 ground-level. The best practise is to also make the 

 footing-course a part of the floor of silo, although it 

 cannot be done when uprights must be erected in- 

 side the forms, as previously explained; in which 

 case the footing extends the proper distance outside 

 and inside the foundation-wall, as shown by dotted 

 lines, and the floor is laid inside this when the silo 

 walls are complete. Where the silo floor is not laid 

 with the foundation, extreme care must be employed 

 to make the joint between edge of floor and footing 

 water-tight, otherwise surface water will collect in 

 the bottom of silo. 



The thickness of foundation-walls, given in Ta- 

 ble II, apply to the foundations where the floor is at 

 ground-level as well as to those below ground-level. 



FORMS FOR MONOLITHIC WALLS WITHOUT 

 AIR-CHAMEER 



After the foundation-walls have had ample time 

 to permanently harden so that they will bear the 

 weight of the concrete for walls of silo the forms 

 for the type of wall you desire to erect are placed, 

 with the necessary staging or uprights to carry the 



