同步控制顶升、摩阻自平衡平移连续箱梁技术研究及其应用

摘要

某客运专线一联道岔连续梁因土堆堆载产生横向偏移，在多跨连续梁桥精确复位中，对同步控制顶升、摩阻自平衡平移技术进行研究。连续箱梁对竖向不均匀位移高度敏感，桥墩与梁底之间空间有限，横向反力台座施工困难，通过对比分析、模拟计算，采用 PLC 计算机同步控制顶升、摩阻自平衡平移技术，能保证顶升过程中的同步性，并巧妙平衡了水平千斤顶横向顶推反力。通过工程实例的应用，证明技术的安全性和可行性。%Due to the load of earth piling,the lateral deviation was occured in a continuous beam of turnout with a joint in a passenger dedicated line,the study on synchronizing control jacking-up technology and self-equation of friction technology for translation in accurate restoring of multi-span continuous beam bridge was introduced.Continuous box girder was highly sensi-tive to vertical non-uniform displacement,and the gap between top of pier and bottom of beam was limited,that caused diffi-culty in construction of lateral counterforce pedestal.By the comparative analysis and simulative calculation,the result showed that synchronizing control jacking-up technology and self-equation of friction technology by adopting PLC computer for translation of continuous box girder could not only ensure the synchronism in jacking-up process,but also subtly balance the lateral jacking counterforce of horizontal jack.The safety and feasibility of technology were proven through application of the project.