移动模架在超宽鱼腹形现浇箱梁施工中的研究与应用

发布时间：2018-05-17 22:08

本文选题：移动模架 + 箱梁　；参考：《施工技术》2017年02期

【摘要】：武四湖大桥是国内首个采用移动模架施工的鱼腹形现浇箱梁,单幅箱梁宽21.5m,混凝土浇筑最大荷载2400t,相较于以往移动模架施工,本套移动模架在设计、拼装、预压、混凝土浇筑等方面施工难度大。通过采用ANSYS有限元分析软件进行整体建模,在确保安全的前提下进行结构优化,减小其重荷比。并创新采用中支腿自动平衡控制技术、双折叠分级开合控制技术,研制出了一套适于宽幅、低墩、大荷载的上行式双折叠移动模架;在移动模架拼装过程中,采用纵移顶推拼装法,在桥跨下方无工作面的情况下,实现快速拼装。在移动模架预压过程中,采用多仓多区复合加载预压技术,精确模拟浇筑工况,取得各构件的变形量,为预拱度的设置提供理论依据。在混凝土浇筑过程中,针对桥梁宽度较大、空间效应明显的特点,采用空间线形控制技术和对称叠合浇筑法,实现对空间效应明显的超宽桥梁进行纵、横向线形的双向控制,以及避免了混凝土出现裂缝及接合面错台。
[Abstract]:The Wusihu Bridge is the first fish-bellied cast-in-place box girder constructed by moving mould frame in China. The single box girder is 21.5 m wide and the maximum load of concrete pouring is 2400t. Compared with the previous construction of moving mould frame, this set of movable mould frame is designed, assembled and preloaded. The construction of concrete pouring is difficult. By using the ANSYS finite element analysis software to model the whole structure, the structure is optimized under the premise of ensuring safety, and the heavy load ratio is reduced. And adopting the automatic balance control technology of middle support leg and the technology of double folding and grading opening and closing control, a set of uplink double fold moving mould frame suitable for wide width, low pier and large load is developed, and in the course of assembling moving mould frame, In the case of no working face below the bridge span, the quick assembly is realized by using the method of longitudinal pushing and assembling. In the preloading process of moving die frame, the multi-storehouse and multi-zone composite loading preloading technology is used to accurately simulate the pouring condition, and the deformation of each component is obtained, which provides a theoretical basis for the setting of pre-camber. In the process of concrete pouring, aiming at the characteristics of wide bridge width and obvious spatial effect, the spatial linear control technology and the symmetrical superimposed pouring method are adopted to realize the longitudinal and lateral linear control of the super-wide bridge with obvious spatial effect. And avoid concrete cracks and joint surface stagger.
【作者单位】：中建五局土木工程有限公司;鄂州市吴楚大道工程建设指挥部;
【分类号】：U445.463

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