Patent ID: 7111751

Claim:
A plastic lined concrete tank comprising a floor, a horizontally elongated upright wall having a lower edge disposed adjacent said floor, said wall being relatively shiftable in a generally horizontal direction relative to said floor, a plastic wall lining disposed on an interior surface of the wall, and a horizontally elongated plastic waterstop structure disposed to extend upwardly between the floor and said wall lining for inhibiting penetration of water between said floor and said lower edge of the wall, said waterstop structure being resistant to damage during shifting of the wall relative to the floor and comprising: an anchor attached to said floor adjacent said wall; and a flange extending upwardly from the anchor, said flange including an upper attachment segment, said upper attachment segment of the flange and a lower attachment portion of the lining being disposed in overlapping relationship relative to one another, said upper attachment segment having an upper edge attached in sealing relationship to said wall lining so as to present an elongated sealed joint which extends along said upper edge in a lateral direction across the wall lining; an area of a surface of said upper attachment segment and a facing area of a surface of said lower attachment portion being interconnected to form a supporting structure at a position lower on the wall than the sealed joint, whereby outward bending of the flange away from the wall lining at said joint during shifting of the wall relative to the floor is inhibited and outward bending of the flange away from the wall lining at a location remote from said joint during shifting of the wall relative to the floor is promoted.