Patent ID: 8915038

Claim:
A method of forming a void in a poured concrete structure using a dynamic concrete form, the dynamic concrete form including a sleeve defining a passage extending between first and second open ends of the sleeve, a first attachment flange extending outwardly in a first direction from, and being coplanar with a top of, the sleeve at the first open end, and a second attachment flange extending outwardly in a second direction that is opposite the first direction from, and being coplanar with a top of, the sleeve at the second open end, the method comprising steps of: attaching the first attachment flange to a first concrete structure form and seating the first open end against a first inner surface of the first concrete structure form; attaching the second attachment flange to a second concrete structure form and seating the second open end against a second inner surface of the second concrete structure form; pouring concrete in a space defined by the first concrete structure form and the second concrete structure form to form the poured concrete structure, wherein the poured concrete contacts a bottom of the sleeve and spaced apart sidewalls of the sleeve; changing a distance between the first inner surface of the first concrete structure form and the second inner surface of the second concrete structure form in response to the step of pouring concrete; changing an axial length of the passage in response to the step of changing the distance between the first inner surface and the second inner surface by telescoping a first sleeve portion of the sleeve relative to a second sleeve portion of the sleeve; and forming the void in the poured concrete structure with the dynamic concrete form, wherein the passage corresponds to the void.