| With the rapid development of rail transit in China and the continuous innovation of bridge engineering, steel box girder has been widely used in many large span bridges. Steel box girder This technology is so popular, mainly because of its light weight, across capacity, easy to install and operate, and can shorten the construction period and other characteristics, especially to a certain extent, can also save on economic expenses. Some bridge design and construction process, when the steel box girder in the laying of asphalt pavement, the steel box girder throughout the installation process will be particularly stringent technical requirements.Based on the Longyou Bridge in Zhengdong New Area of Zhengzhou City, this paper presents a series of problems and solutions in the process of installation and installation of steel box girder. The main research results are as follows:1. Segmentation of steel box girders should take full account of crane performance and site hoisting situation, but also in the factory as much as possible processing of large components, reducing the amount of on-site welding work principle, the main steel box girder is divided into AB two, A by four small box beam composition, is divided into seven, 28, B by the five small box beam composition,vertical also divided into seven, 35, each segment are cantilevered Ribbed box section bar, the section of the web is H-shaped, the top of the mouth and the bottom of the mouth along the width of the direction of the U-shaped ribs from the holistic point of view, to strengthen the optimal form of welding design in order to protect Strength and accuracy at the time of installation.2. During the installation and installation of the steel girder, it is found that every two steel pipe piles are connected to each other immediately after they are in place.They must be connected in two or four levels according to the height to ensure that Column of the stability, when the height is less than 8m, set up two horizontal connection support, on the contrary, you must set up four horizontal connection support.3. In the midas, node / cell modeling is slow and error-prone, while drawing in AutoCAD is more convenient and accurate, and can be imported into Midas, In the CAD sub-layer mapping out the distribution beam, steel column, connecting beams,generate dxf exchange, and then by the Midas into each structural unit to give theappropriate cross-section and material to generate full-frame stent Midas model. This method can improve work efficiency.4. Considering the load of the steel box beam to the distribution beam and the weight of the distribution beam, the maximum stress value of the distribution beam of the heaviest steel box girder section is 169.77 MPa, the calculated allowable stress is180.00 MPa, This shows that the distribution of beam stress to meet the requirements.5. Steel box girder construction closure methods include: Closing timing, closing construction sequence, important technical requirements.6. There are many factors that affect the level of installation of steel beam engineering, in which the weld connection of steel beam components must be assessed through the process, a clear welding process parameters. The welding method, welding structure and welding procedure of each component shall be determined jointly by design, construction and supervision. |
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