Athletic track with post-tensioned concrete slab
July 10, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3795949 3801421 Method of securing a perimeter fence around an ice rink without embedding into ground Outdoor surface compositions Cushioned protective surface Prestressed concrete roadway Athletic playing surface Synthetic running surface Highway pavement Screed track for concrete slab construction InventorsApplicationNo. 613301 filed on 07/10/2000US Classes:404/31, Plural layers404/17, PAVEMENT404/32, Rubber or rubber-like404/47, Including joint means404/70Reinforced structureExaminersPrimary: Shackelford, H.Assistant: Hartmann, Gary S. Attorney, Agent or FirmInternational ClassesE01C 005/08E01C 005/18 E01C 003/00 AbstractAn athletic track having a post-tensioned concrete slab supporting a resilient surface. The athletic track has opposed, parallel rectangular side areas and opposed semi-circular end areas connecting the side areas. The concrete slab is cast in place without requiring expansion joints between segments. Cables are cast into the slab for providing a tension load in the concrete slab. A first set of cables is tilted away from the perpendicular in a first direction while a second set of cables is parallel to the edges of the rectangular areas such that members of the second set of cables cross members of the first set of cables. A third set of circumferential cables is provided in the semi-circular end areas. A fourth set of cables intersecting the circumferential cables is non-radially disposed. The slab has a relatively flat lower surface. Pour strips situated along a line of symmetry are provided between adjacent quadrants of the end areas. | |
