超大吨位斜拉桥水平转体铰型式研究

发布时间：2019-01-27 10:52

【摘要】：研究目的:某城市主干道上跨既有干线铁路采用独塔空间四索面预应力混凝土斜拉桥,施工方式为转体施工,转体重量为3.3万吨,远超已有工程实践。本文主要分析转体铰型式,为本工程超大吨位转体施工选择适合的转体铰型式提供依据。研究结论:(1)球铰刚度大于平铰,球铰适应转体偏载的能力强于平铰;(2)球铰底部混凝土受力情况均小于平铰;(3)转体球铰在转体支撑协调性、转体结构受力和变形的均匀性、牵引力的稳定性、转体安全性、转体后梁体姿态调整、施工可实施性能、出现问题可调整等方面,均具有更好的性能;转体平铰对转体施工控制要求较高,上部转体结构的载荷分布不均匀以及转动面的安装平面度误差都会显著影响转动可靠性;(4)本工程3.3万吨超大吨位转体设计选用球铰型式是适合的;(5)该研究成果可为采用大跨度桥梁跨越既有构筑物超大吨位转体施工提供借鉴,并可有力拓展转体工法的应用范围。
[Abstract]:Research purpose: the prestressed concrete cable-stayed bridge with single tower space and four cable plane is adopted on the trunk road of a certain city. The construction mode is rotary construction, the turning weight is 33000 tons, which far exceeds the existing engineering practice. This paper mainly analyzes the type of rotary hinge, and provides the basis for selecting suitable type of rotary hinge for super large tonnage rotary construction of the project. The conclusions are as follows: (1) the stiffness of spherical hinge is greater than that of flat hinge, and the ability of spherical hinge to adapt to the deflection load of rotary body is stronger than that of flat hinge, (2) the stress of concrete at the bottom of spherical hinge is smaller than that of flat hinge; (3) the coordination of the spindles, the uniformity of force and deformation, the stability of tractive force, the safety of the swivel, the adjustment of the attitude of the beam, the performance of the construction, the adjustment of the problems, and so on. All have better performance; The horizontal hinge has a high requirement for the control of the rotary construction, and the uneven load distribution of the upper rotary structure and the installation flatness error of the rotary plane will significantly affect the rotational reliability. (4) it is suitable to select the spherical hinge type for the design of the 33000 ton superlarge tonnage rotation of the project; (5) the research results can be used for reference in the construction of large-tonnage rotation of long-span bridges across existing structures, and can be used to expand the scope of application of the rotary method.
【作者单位】：铁道第三勘察设计院集团有限公司;中国船舶重工集团有限公司第七二五研究所;
【分类号】：U448.27;U445.4

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