轨道交通BIM管件自动生成关键技术研究

Key Technology Study for Automatic Generation of Rail Transit BIM Pipe Fittings

为解决城市轨道交通管线复杂且生成管道3D模型仍依赖人机交互的问题,提出一种自动生成参数化BIM(building information modeling)管道连接件的方法。针对因绘图不规范而导致管道的起点和终点坐标无法唯一确定的问题,该方法基于直管中心线坐标,通过空间向量运算自动判断两根、三根和四根管线间应添加的弯头、三通、四通等连接件类型,然后结合标准构件尺寸表计算管件形状和位置参数。此外,利用IFC(industry foundation classes)表达模型,使用C++语言实现模型的自动生成。经验证,该方法可显著提高管道模型生成效率和自动化程度。

This paper proposes an automated method for generating parametric BIM pipe fittings to tackle the complexity of urban rail transit pipelines and reduce the reliance on manual intervention for generating 3D models.The method addresses the challenge of accurately determining the start and end coordinates of pipelines due to irregularities during the drawing stage.The proposed approach employs spatial vector operations to automatically identify the types of fittings(such as elbows,tees,and crosses)required between two,three,and four pipelines based on the centerline coordinates of straight pipes.It then calculates the shape and positional parameters of these fittings by referencing standard dimension tables.The model is expressed using industry foundation classes(IFC),and the implementation leverages the C++language to achieve the automatic generation of models.Verification of the method demonstrates significant improvements in efficiency and automation in the generation of piping models.