Patent ID: 7137756

Claim:
A box culvert and gasket assembly, comprising: a precast concrete box culvert defining a longitudinally-extending passage therethrough for fluid flow between openings formed in opposite end faces of said box culvert; a spigot for use in forming a bell-and-spigot-joint with a like box culvert extending longitudinally from one of said end faces about one of said openings, said spigot being substantially rectangular in end elevation and having rounded corners in end elevation formed at a predetermined radius of curvature, said spigot in end elevation having substantially straight and elongate upper and lower sections each connecting to substantially straight and elongate right and left side sections via said rounded corners, and said radius of curvature of said rounded corners being about 6 to about 10 inches; and a one-piece rubber gasket secured to an outer peripheral surface of said spigot such that said gasket encircles said spigot, said gasket being continuous without ends and extending over said rounded corners, said rubber gasket having approximately 4% to 8% elasticity and a durometer of about 40 to about 50, and said gasket being cemented to said outer peripheral surface of said spigot with a layer of cement that extends substantially continuously about said spigot on said outer peripheral surface of said spigot.