| 摘要 |
PURPOSE:To remarkably improve executing ability and executing accuracy and facilitate unmanned execution. CONSTITUTION:The upside and side of a lower bridge girder A fixed on a bridge pier are buriedly provided with a floating electromagnet 1 and magnetic cement 2, and the bottom and side of an upper bridge girder B are severally buriedly provided with magnetic cement 3 and a propelling-bracing electromagnet 4. The electromagnet 1 is turned on to make magnetic repulsive force float up the upper bridge girder B, and electric current flowing through the electromagnet 4 is controlled to make the magnetic repulsive and the attracting force, which act between the electromagnet 4 and the magnetic cement 2 on the lower bridge girder A, advance the upper bridge girder B. |
