Patent ID: 8544505
Filing Date: 2013-10-01
Classification: B28B,F16L

Abstract:
1. A pre-stressed concrete pipe comprising; a metallic cylinder having a first end, a belled second end, and a plurality of holes through said cylinder, a first shaped annular ring having a threaded hole therein, a second shaped annular ring, having a groove therein, embracing an inside diameter of said first shaped annular ring, a first hermetic weld bead attaching said second shaped annular ring to said first shaped annular ring, a first resilient seal band bonded onto an inner portion of said second shaped annular ring, said attached first and second shaped annular ring are positioned within said metallic cylinder first end, a second hermetic weld bead connecting said first annular ring to said metallic cylinder first end, and a third shaped annular ring, a second resilient seal band bonded onto said third shaped annular ring, wherein said third shaped annular ring and attached seal band is positioned within said metallic cylinder adjacent to said second end in communication with at least one metallic cylinder hole, a third hermetic bead attach said third annular ring portion to said metallic cylinder second end, a cast concrete tube within said metallic cylinder, a pressurized solidifying compound disposed between said metallic cylinder and said concrete tube such that said concrete tube remains constantly in a tangential compressed state, and an O-ring seal positioned within a first annular ring cup shaped O-ring recess.