A combined construction method of buckles and slings in the triangular area of ​​a steel diagonally braced continuous rigid frame bridge

Abstract

This application relates to a joint construction method of buckles and slings in the triangular area of ​​a continuous rigid frame bridge with steel diagonal braces, and relates to the technical field of rail transit bridge engineering. Construction of concrete pier columns and two pier column corbels; S2: Construction of the initial section of the upper string girder of the concrete box girder deck; installation of a vertical upper string temporary buckle tower above the initial section, and the initial section of the upper string beam Hanging baskets are installed on both sides of the section for suspending the rest of the upper string beam segments; S3: pouring the upper string beam segments in pairs; tensioning the upper string temporary buckle cables; installing the lower string temporary slings, and hanging and installing the lower string beam segments; S4: Until the triangle area is closed. The combined construction method of buckles and slings in the triangular area of ​​the application simplifies the construction temporary structure, optimizes the construction steps, reduces the workload of on-site construction, reduces the difficulty of construction, and shortens the construction period.

Description

technical field [0001] The present application relates to the technical field of rail transit bridge engineering, in particular to a combined construction method of a steel diagonal bracing continuous rigid frame bridge with buckle cables and slings. Background technique [0002] At present, in order to adapt to different rigid-frame bridge structures and surrounding environments during the construction of continuous rigid-frame bridges, the commonly used construction methods for continuous rigid-frame bridges generally include support construction method and cantilever construction method, but they are only suitable for continuous rigid-frame bridges with relatively short spans. small situation. For open-web rigid-frame bridges with large spans, the support construction method needs to pour the bottom chord first and then the top chord, which requires a long construction period and a large amount of temporary supports. In the cantilever construction method, due to the long...

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Problems solved by technology

[0004] However, when the buckle-cable support joint construction method removes the support, it will lead to changes in the bridge structural system, resulting in secondary stress of constant load creep, which is very unfavorable to the force of the bridge structure. The requirements for the position and strength of the support Both need to be strictly controlled, the difficulty of construction control increases, and the construction period is long

In the double-cable construction method, since the lower string box girder runs obliquely to the top of the beam, it is necessary to design a new type of hanging basket that meets the slope change of the box girder and the anchoring requirements, and the lower string box girder’s formwork-removal process is cumbersome, and the amount of concrete At the same time, in the construction of the triangular area, as the lower chord beam section becomes longer, the angle between the cable and the box girder becomes smaller, and the tensile stress generated by the self-weight of the beam section is eliminated by increasing the force of the buckle cable to apply the axial force to the lower chord , affected by the tension, the upper and lower chord beams are in a state of high stress level, which has a certain impact on the structural safety, and at the same time greatly reduces the utilization rate of the cables

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