Construction method of steel truss composite girder bridge with continuous first and then simple support
A construction method and technology of steel truss girder, applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc., can solve the problems of high cost of bridge engineering, complicated construction, easy cracking of bridge deck in negative bending moment area, etc., so as to reduce engineering cost. , The effect of simplifying the construction process and improving the efficiency of pre-stressing
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Embodiment 1
[0033] Such as Figure 1-6 As shown, a steel truss composite girder bridge with 4 holes and 30m span is constructed by the method of continuous first and then simple support, including the following steps:
[0034] In the first step, the steel truss units were prefabricated in the factory and then transported to the construction site.
[0035] Such as Figure 7 , 8 As shown, the above-mentioned steel truss girder unit has four sections, each section is 30m in length, and the beam height is 1.0m. They are all composed of top plate 1, bottom plate 2, solid web steel web 3 and diagonal web bar 4 made of Q345C steel. Among them, the solid-web steel web 3 is arranged at both ends of the steel truss beam unit by welding with the top plate 1 and the bottom plate 2. Each solid-web steel web 3 is a steel plate with a length of 3.5 m, and the inner side is made of a round arc transition to eliminate stress concentration; the middle section of the 23-meter-long steel truss beam unit lo...
Embodiment 2
[0044] Such as Figure 12 As shown, under the action of the first-period dead load q1 and the second-period dead load q2, the middle support and mid-span bending moment diagrams of the main beam under the three cases of support construction, simply supported variable continuous construction and continuous variable simply supported construction of the present invention By comparison, it can be seen that with the continuous variable simply supported construction method, the negative bending moment borne by the middle support position is close to zero, and the risk of bridge deck cracking is greatly reduced.
[0045] In summary, the steel truss composite girder in the present invention has the advantages of low building height and high rigidity. Compared with the traditional I-beam / steel box girder composite girder, it can not only save steel, but also improve the roof concrete and bottom slab. Prestressing efficiency of concrete. Compared with the continuous composite girder, the...
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