BIM技术在高速铁路32 m简支箱梁钢筋优化设计中的应用

Application of BIM Technology in the Optimized Design of 32 m Simplysupported Box Beam's Steel Reinforcements for High-speed Railway

我国高速铁路桥梁以32 m预应力混凝土简支梁桥为主,在32 m简支箱梁结构优化设计的基础上,为提高设计精度、优化钢筋布置、节省钢材用量、降低施工难度,将BIM技术应用到32 m简支箱梁的钢筋优化设计中。基于BIM技术在铁路工程领域的应用研究,采用Bentley平台软件对优化后的32 m简支箱梁进行BIM建模,主要结论如下:(1)实现了精细化简支箱梁BIM模型,外部结构包含参数化箱梁主体、梁体孔道、吊梁混凝土块等细部结构,内部结构包含全部梁体钢筋、预应力体系和多种预埋件等结构,以三维可视化的方式将各结构之间的空间位置关系表达清楚;(2)采用软件的冲突校核功能进行钢筋碰撞检查,重点针对梁端处、梁截面变化段及预应力管道周围的钢筋进行优化设计,共节省钢筋用量1281.59 kg,约占整孔箱梁钢筋用量的2.5%;(3)对箱梁的内部结构进行BIM模型还原与钢筋深化设计,提前解决施工难题,现场指导钢筋大样的制作、梁体钢筋的试拼与绑扎,显著减少施工过程中的钢筋安装问题,可为铁路简支箱梁的BIM技术应用提供参考。

China's high-speed railway bridges are mainly 32 m pre-stressed concrete simply-supported beam bridges.Based on the structural optimization design of 32 m simply-supported box beam,BIM technology is applied to the steel reinforcementsoptimization design of 32 m simply-supported box beam.The application of BIM technology improves design accuracy,optimizes reinforcements arrangement,reduces steel consumption,and lowers construction difficulty.Researches on the application of BIM technology in the field of railway engineering.Bentley's software is used for BIM modeling of 32 m simply-supported box beam after optimization.The conclusions are as follows:(1)Refined simplysupported box beam BIM model is established.External structures contain parametric box beam model,apertures,concrete blocks for lifting and other detailed structures.Internal structures contain all steel reinforcements,prestressed system,embedded parts and other structures.The spatial position relationship between components is clearly expressed in 3D visualization.(2)The clash detection function of the software is used to check steel reinforcements collision.This optimized design focuses on the steel reinforcements at the both ends of beam,the section changing beam segments and the area around prestressed reinforcements.A total of 1281.59 kg of steel is saved,accounting for about 2.5%of the overall steel assumption.(3)Internal structures of box beam are clearly demonstrated by the BIM model.Construction difficulties are solved in advance by optimized design of steel reinforcement.The BIM model can be used to guide the steel reinforcements production,assembling and binding on construction site,which significantly reduces the problems of reinforcements installation during construction,and provides references for the application of BIM technology for the same type of simply-supported box beam.