穿越机场枢纽的铁路工程线位衔接处理方法

Line connection treatment method in railway engineering crossing airport hubs

在铁路勘测设计中,线路穿越机场、接入引出大型站场枢纽时出现新旧线位的衔接问题较多。针对某机场枢纽铁路勘测设计实践中出现的线位衔接调整,不同坐标系下的一体化施工问题展开研究,通过多种线位转换方案的相对关系比较,以线位相对位置偏差大小作为转换方案选择依据,以转换后的既有线线位进行在建铁路线位衔接接轨设计。对地上机场设施、地下铁路附属工程一体化施工,提出共用一套施工控制点,实现多单位立体重叠各项工程的修建位置匹配、轨道位置与构筑物建筑限界匹配的目标。对其它既有线接轨设计、城市轨道交通延伸设计等不同时期控制网不兼容、线位与控制网不匹配,设计理论中线与实际中线接轨不符等问题,提供一种解决方法。

In the railway survey and design,there are many problems in the connection between the old and the new lines when the line passes through the airport and leads to the large station and yard hub.In view of the alignment adjustment and integrated construction under different coordinate systems in the survey and design practice of an airport hubs railway,this paper studies the relationship of various line position conversion schemes,takes the relative position deviation of line position as the basis for selection of conversion scheme,and carries out the alignment design of railway under construction based on the converted existing line location.For the integrated construction of above ground airport facilities and underground railway auxiliary works,a set of construction control points is proposed to realize the matching of construction position and track position with the structure clearance of multi-unit three-dimensional overlapping.This paper provides a solution to the problems such as the incompatibility of control network,the mismatch between line position and control network,and the inconsistency between the design theory and the actual central line.