Economy Bailey Truss Double Guide Beam Bridge Machine Assembly Design And Applied Research

The structure of Bailey truss bridging machine changes a lot depending on the conditions of the number of the beams, beam span, weight, and the existing quantity of Bailey truss.This article is based on the erection of precast beams of the Ru Chen high-speed outlet viaduct and the assembly design and application of the the economical Bailey truss bridge machine.The project Features of Ru Chen high-speed outlet viaduct is: 20m hollow beams weight less than 40m T-beams, and 20m hollow beams have a large number,40m T-beam accounts one-tenth of the total beams.The site has already got 20m T-beam truss girder bridge machine,if the site purchase the 40m T-beam truss girder bridge machine,it will cost a lot in money and time.The focus of this paper is how to achieve 40m T-beam task with the existing 20m T-beam bridge machine safely and economically.The following results have been achieved.(1)The modified Bailey truss bridge machine, with 3 rows of strengthening Bailey truss in the side beam, setting temporary buttress in 40m span,the bridge machine runs along the T-beam center line.The Initial calculate shows the flexural capacity and stiffness fully meet the requirements; but short of shear strength, the reason is that the leg above the vertical bar has a relative increase stress and found that Bailey truss structure is difficult to work fully as simple structure, this must be taken to reinforce measures.In this paper,4 rows Bailey truss strengthen in the leg, additional strengthening measures such as strengthening the vertical bar. Then use the finite element software to establish the leading beam model of the Bailey Truss bridge machine, the calculation shows that it meets the demand through the strengthening program, Especially strengthening the vertical bar before and after the legs,the shear strength of Bailey truss bridge machine Increase obviously to fully meet the shear requirements of 40m T-beam, and the small amount of material required, to give full play to Bailey truss bridge machine.(2)The modified Bailey truss bridge machine meets the stability requirements. The paper analysis and compare the stability effects of the wind load on the Bailey truss bridge machine, draw the conclusion that the wind load on the Bailey truss bridge machine stability is less affected.(3) By comparing the calculation model it was found that the type of angle steel support frame affect a lot in Bailey truss bridge machine. After the addition of strengthening the vertical bar, the stability of the girder crane in the leg near the girder condition has greatly improved,and the stability of other girder loading conditions have improved to some extent, the strengthening vertical bar should be established.The release of the upper part of the lateral buttress constraints will reduce the overall stability of bridge machine,so we should control the displacement of top of the temporary support Buttress.