Design and Experimental Study of Height-Adjustable Devices Using Low-Melting-Point Alloys for Rail Bridges
In response to the increasing speed and strict requirements for bridge smoothness in the design of rail-elevated bridges,this study is based on the design of the elevated bridge of Beijing Metro Line 22 at a speed of 160 km/h.A new type of adjustable height device is developed and designed based on a low-melting-point alloy as the height adjustment medium.A series of experimental studies are conducted,including the structural design of the device,indoor temperature and pressure tests,full-scale pressure adjustment performance tests of the compression shear machine,and on-site beam erection tests.The findings indicate that the new adjustable height device enables stepless bidirectional height adjustment with a rapid adjustment speed,completing height changes within 30 s.The device achieves millimeter-level accuracy,and the alloy demonstrates excellent stepless adjustment performance and compression stability once cooled and solidified.The accuracy and stability of this adjustable height device not only ensure the smoothness of elevated bridge beams but also offer valuable guidance for engineering applications,such as replacing deteriorated bearings and adjusting for differential settlement in bridges.
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