US 11,698,158 B2 · Cap for risers in concrete decks

Abstract

An assembly creates annular voids in concrete around the distal end of cylindrical tubes. A cap has a flat top and a cylindrical, depending skirt. An annular, foam plug extends between the inside of the skirt and the outer diameter of the tube. The plug has an undeformed inner diameter smaller than an outer diameter of the tube to create an interference fit around the tube and keep concrete out when the cap is on the end of the tube. The plug has a radial thickness of 0.3 to 1 inch, and has an axial length of 1 to 3 inches, with a bottom of the plug located at a bottom of the skirt. The cap is glued to the end of the tube for pressure testing. After the tube is entrained in concrete, the cap and plug are removed to leave a void in the concrete surface.

Claims17

Dependent claims

An assembly for creating annular voids in concrete around a cylinder having a distal end with an outer diameter, comprising:

a cap having a top plate with a flat top and a cylindrical skirt depending from an outer, cylindrical periphery of the top plate, the cylindrical skirt having an axial length;
and
an annular plug placed inside the cylindrical skirt and against a portion of the cylindrical skirt and extending around a circumference of the cylindrical skirt, the annular plug having a radial thickness and an axial length, the annular plug having an undeformed inner diameter to interface with the outer diameter of the cylinder;
the annular plug having an inner cylindrical surface and an opposing outer cylindrical surface, wherein the inner and outer cylindrical surfaces are straight along the axial length of the annular plug;
wherein the annular plug has an undeformed outer diameter to interface with an inner diameter of the cylindrical skirt.

2 more elements

Dependencies are inferred from the claim text.

Cap for risers in concrete decks

Life of this patent

Cap for risers in concrete decks

Life of this patent

Abstract

Claims17