Patents Assigned to Dae Nung Industrial Co., Ltd.
  • Patent number: 5644890
    Abstract: A method for connecting prestressed beams having lower flanges cast with compressively prestressed concrete to construct a prestressed continuous beam having a moment equal to zero at both ends thereof and negative moments at at least one connection point of the prestressed beams. The method includes the step of placing the prestressed beams in end to end relation. Adjacent ends of the prestressed beams define at least one connection point. The method further includes connecting the prestressed beams together at the connection point, deflecting the prestressed beams at at least one connection point within the limitation of elasticity of the prestressed beams to a deflected position, casting and curing concrete on the prestressed beams at the connection point, and at least partially returning the prestressed beams at the connection point from the deflected position whereby compressive stress is introduced to the concrete cast and cured on the prestressed beams at the connection point.
    Type: Grant
    Filed: November 22, 1994
    Date of Patent: July 8, 1997
    Assignees: Dae Nung Industrial Co., Ltd., Dae Nung Construction Co., Ltd.
    Inventor: Min-Se Koo