Reinforcement of concrete structures

Claim 2

A mold arrangement for forming reinforced concrete structures, said mold arrangement comprising an elongated outer shell having slots therethrough located intermediate its ends, anchor plates extending through said slots and detachably secured to said outer shell thereat and reinforcing rods extending along the interior of said outer shell and having terminals detachably secured to said anchor plates in a manner permitting release of said plates from said rods by withdrawal of said plates out from their slots, said rods being tensionable from either end, wherein said outer shell forms an enclosure and further includes means for rotating said shell about its longitudinal axis for centrifugally casting saiD concrete.

Claim 3

A mold arrangement as in claim 1 wherein said outer shell is elongated and is provided with end walls at the ends thereof.

Claim 4

A mold arrangement as in claim 2 wherein one end of each of said reinforcing rod is anchored to one of said end walls, and the other ends of various ones of said reinforcing rods are terminated at different ones of said slots along said outer shell.

Claim 5

A mold arrangement as in claim 1 wherein said outer shell is provided with flange means on the outer surface thereof near each of said slots.

Claim 6

A mold arrangement as in claim 4 wherein said anchor plates are pinned to said flange means.

Claim 7

A mold arrangement for centrifugally casting a reinforced concrete load supporting structure comprising an elongated, tapered, outer shell, the taper of the shell being such that the weight of concrete formed therein at any location therein together with the external load forces acting at said location produce a predetermined stress distribution along the length thereof, a plurality of spaced reinforcing rods extending along the interior of the outer shell and spaced inwardly of said shell so as to be embedded in said concrete when formed in said shell, selected ends of certain ones of said reinforcing rods terminating at locations intermediate the end of said shell, said shell having slots therethrough, anchor plates extending through said slots and detachably secured to said outer shell thereat, the ends of said certain reinforcing rods being detachably secured to said anchor plates in a manner permitting release of said plates from said rods by withdrawal of said plates out from their slots, said rods being tensionable thereby to obtain such predetermined stress distribution along the length of said structure, and means for rotational movement about a longitudinal axis.

Claim 8

A mold arrangement for centrifugally casting a reinforced concrete load supporting structure comprising an elongated, tapered, outer shell, the taper of the shell being such that the weight of concrete formed therein at any location therein together with the external load forces acting at said location produce a predetermined stress distribution along the length thereof, a plurality of spaced reinforcing rods extending along the interior of the outer shell and spaced inwardly of said shell so as to be embedded in said concrete when formed in said shell, selected ends of certain ones of said reinforcing rods terminating at locations intermediate the end of said shell, said shell having slots therethrough, anchor plates extending through said slots and detachably secured to said outer shell thereat, the ends of said certain reinforcing rods being detachably secured to said anchor plates in a manner permitting release of said plates from said rods by withdrawal of said plates out from their slots, said rods being tensionable thereby to obtain such predetermined stress distribution along the length of said structure, and means for rotational movement about a longitudinal axis.

Claim 9

A mold arrangement according to claim 6 wherein said elongated, tapered outer shell is of cylindrical configuration.

Claim 10

A mold arrangement according to claim 6 wherein said longitudinal axis is horizontally disposed.

Claim 11

A mold arrangement according to claim 6 wherein said reinforcing rods terminating at locations intermediate the ends of said shell extend through said shell to the exterior thereof, and means mounted exteriorly of said shell for tensioning said extended rods.