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在汽车道路上安装装配式桥梁上部构造,到现在为止主要的方式还是采用橡皮轮行驶的或履带行驶的旋转臂式起重机或门架式起重机。在很多情况中超重量达10吨的旋转臂式起重机是用来在干谷的地方或桥梁河滩部分上横向安装上部构造的。不管桥位的情况如何以及梁的重量有多大,装配式桥梁上部构造都可以用门架式起重机来安装。用门架式起重机的安装方法,除了有很多的优点以外,也有如下的许多缺点: 1)必须设置起重机下的栈桥,在许多情况中,这种栈桥的体积相当大; 2)进行安装时要受河中水位变化的影响;
The installation of a prefabricated bridge superstructure on a motorway has so far been dominated by the use of rubber-lined or crawler-mounted rotary jib cranes or gantry cranes. In many cases the over-the-top rotary boom cranes are used to transversally mount superstructures over dry valley or bridge floodplain sections. Regardless of the bridging position and the weight of the beam, the prefabricated bridge superstructure can be mounted with gantry cranes. In addition to many advantages, the gantry crane installation method has many shortcomings as follows: 1) The crane under the trestle must be installed. In many cases, the size of the trestle is quite large. 2) When installing Affected by changes in river water level;