Abstract：Research purposes: The structure of 15 spans 2X108m single T rigid frame steel truss was used for the main bridge of Shanxi-Shaanxi Yellow River of the Datong-Xi'an Passenger Dedicated Line and it was used in China for the first time. The single box and double chamber structure with various heights and sections, many segments and heavy weight was used for the box girder. The symmetrical pouring was conducted in the sections of the T rigid frame cantilever after the suspended scaffold was assembled on the piece 0#. To ensure the safe and high-efficient construction of the 2X108m T rigid frame, the movable suspended scaffold with less weight and being able to bear the load of the heavy segment had to be designed for cooperating with the construction.
Research conclusions: The tri-piece and double assemble rhombus truss structure was used for the 2X108m T rigid frame as the main frame to bear the load. (1) The member bar met the requirement of the load bearing, the maximum deformation of the suspending system on the bottom die platform was 11.3 mm, the maximum deformations of the internal and external sliding girders and suspension were 7.2mm, the maximum deformations of the front top cross girder and rhombus truss structure were 25.1 mm, the maximum deformation of the rear anchorage system was 1.7mm and the load bearing and deformation of the member bar of the suspended scaffold was in allowable range. All these met the requirements. (2) The suspended scaffold weight was less and it could save the cost. (3) It was easy to operate and it could speeded up the construction process on the premise of ensuring the construction quality. (4) It could provide the reference to the similar works.
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2013, Vol. 30 
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