在桥梁建设中,在营业线上施工,一般采用拖拉法更换桥梁,在新建铁路施工不能使用架桥机时,也用拖拉架梁。我队长期以来都是以地笼作锚点,以人推绞磨作动力,通过钢丝绳滑车组传动牵引力。以后,改用卷扬机、拖拉机代替了人推绞磨,虽有局部改善,仍未彻底革新。1975年我队首先试制成功了液压滑梁 In the bridge construction, the construction of the business line, the general use of the tow method to replace the bridge, bridge construction in the new railway construction can not be used, it is also used to drag the girder. My team has long been based on the ground cage as an anchor point, people push cutter for power, transmission traction through the rope block. Later, the switch to winch, tractor instead of people push cutter, although the local improvement, still not completely renovated. In 1975 my team successfully trial hydraulic skids