| 摘要 |
PURPOSE: A prestressed concrete girder with regulable tensile force is provided to repair the deflection or crack of a bridge by load and to increase load carrying capacity of a bridge at need. CONSTITUTION: The prestressed concrete girder with regulable tensile force comprises an upper flange(28), a lower flange(24), a web(22) and at least one or more steel wires(26,27) installed to the longitudinal direction of a girder(40) from the lower end of the web(22) of the girder(40) to the lower flange(24).
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