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Bailey truss assembled bridging structure change, with the number of the girder, beam span, the number of weight and the Bailey truss equipment. This article is based on Ru Chen a high-speed outlet viaduct precast beam erection work, study economy Bailey truss bridge machine assembled design and application. Ru Chen's high-speed outlet viaduct project characteristics: 20m hollow plate beam much smaller than 40mT beam weight, 20m hollow plate girder while a large number of, 40mT beam quantity is less than one-tenth of the total number of beams. Site existing host 20mT beam Bailey Truss bridge machine, buy another assembled the 40mT beam bridge machine, higher costs and longer cycle. How to use existing the 20mT beam bridge machine, reasonable transformation, safe, economically achieve the 40mT beam erection tasks, is the focus of this study. Obtained the following findings: (1) modified Bailey truss bridge machine, unilateral dominant girder row strengthen the Bailey Truss 40m temporary buttress cross T beams along the bridge machine center girder process line operation. Preliminary calculated flexural capacity and stiffness fully meet the requirements; shear capacity is quite insufficient reason to stress the relative increase in the legs above the vertical rod, found that the Bailey truss assembly consecutive structure is difficult as the simply supported structure as fully to play a the Bailey truss piece of performance, the reinforcing measures must be taken to do this. In this paper, a strengthened and additional strengthening vertical rod to strengthen measures in the legs at the 4 rows Bailey truss piece. Then create a Bailey truss bridge machine led beam model using the finite element software, by the calculation and analysis, through the strengthening program, static calculations to meet the requirements. Especially in the legs before and after additional to strengthen vertical rod, Bailey Truss bridge machine significantly improve the overall shear capacity, can fully meet the erection the 40mT beam shear requirements, and the small amount of material required, to give full play to the Bailey Truss the bridge machine's overall role. (2) Bailey Truss bridge machine modified to meet the stability requirements. The analysis and comparison of the wind loads on the stability of the Bailey truss bridge machine, come wind load Bailey Truss bridge machine stability. (3) In this paper, model comparison, found support frame angle iron type of the Bailey truss bridge machine. Additional strengthening vertical rod, transporting girder crane is located in the legs near the girder conditions greatly improved stability, certain other girder load cases, so it should be an additional strengthening vertical rod. Release Bailey Truss bridge machine temporary buttress upper lateral constraint, erecting machine overall stability will be reduced, should control the displacement of the Pier Top temporary support.
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