Thin sheet having punched-out adhesion projections for use in compound structures, and compound structures constructed therewith

DETAILED DESCRIPTION It may be observed in general that with the aid of a set of adhesion projections produced from thin sheet by punching, rolling or in other ways, the adhesion between the mold and the concrete can be made efficient enough so that after curing of the concrete the mold or equivalent will efficiently reinforce the concrete in all directions.
It is one of the consequences of this characteristic that the design taught by the invention is applicable in the reinforcement of concrete beams and columns and of crosswise bearing concrete slabs, and of concrete walls.
When the design of the invention is employed in order to form relief cavities in concrete structures, the mold will, after the concrete has hardened, reinforce the vicinity of the hole and it will operate, when the structure is put under load, as a reinforcement of the traction and compression sides.
It is a general object of the invention to produce a set of adhesion projections or tongues which makes the thin sheet into a usable reinforcing member in all commonly made concrete structures, such as beams, columns, slabs, walls, shells, etc.
It is a special object of the invention to produce a set of adhesion projections such that moving about on the sheets will be safer than before, so that there is no fear of the "adhesion nails" penetrating the shoe sole or of a "nail" passing through a worker's clothes if he falls on such a plate.
It is also an object of the invention to provide a set of adhesion projections by the use of which the transporting costs of the sheets can be lowered for the reason that the sheets stacked upon each other fit more closely together than in prior art.
It is an additional object of the invention to produce a set of adhesion projections such that the adhesion projections and the punch-outs therewith associated will be small in size, in which case the adhesion between the thin sheet and the concrete is accomplished without any great loss of steel cross section.
This also affords the special advantage that the punch holes in the thin sheet need not be completely covered over since the concrete cannot in detrimental degree penetrate through the holes, which can be made comparatively small