倒T节段盖梁预制工艺及有限元分析

Prefabrication process and finite analysis of inverted T-section cover beam

随着城市高架道路对现场文明施工和环保要求越来越高,对安全质量管理要求也越来越精细化。装配式桥梁构件的预制技术集标准化、工厂化和模块化为一体,可以高效提高机械自动化水平,确保工程质量,加快施工进度,降低劳动强度,减少对环境的不利影响,已成为国内外建设行业主要的建设方向。以实际工程为例,介绍预制节段盖梁的生产控制,对混凝土浇筑、模板安装、钢筋加工及绑扎、预埋件定位等装配式桥梁预制盖梁关键施工技术展开阐述。同时,利用有限元分析软件Abaqus对倒T盖梁进行受力分析,通过分析可以看出倒T盖梁的薄弱部位,有利于对盖梁的制造设计进行指导。本次工程实践对今后预制大型构件在市政桥梁上的运用及施工场地的选择方面拓宽了方向,具有参考意义。

As urban elevated roads have higher and higher requirements for on-site civilized construction and environmental protection,the safety and quality management requirements are becoming more and more refined.The prefabrication technology of assembled bridge components integrates standardization,factoryization and modularization,which can efficiently improve the level of mechanical automation,ensure the quality of the project,accelerate the construction progress,reduce the labor intensity,and reduce the adverse impact on the environment.It has become the leading construction direction of the domestic and foreign construction industries.An actual project is utilized as a case study to illustrate the production control of prefabricated section cover beams,and elaborates on the crucial construction technologies involved in prefabricated bridge cover beams,including concrete placement,formwork installation,steel bar processing and binding,as well as embedded parts positioning.Meanwhile,the finite element analysis software Abaqus is employed to analyze the force distribution of the inverted T cover beam.The weak points of the structure can be identified through the analysis,which is beneficial to guide the manufacturing design of the cover beam.The engineering practice has broadened the direction of the application of prefabricated large-scale components on municipal bridges and the selection of construction sites in the future,and has reference significance.