预制后张法预应力混凝土简支箱梁新梁图技术经济指标分析

Analysis of technical and economic index of new beam drawing of precast post-tensioned prestressed concrete simple supported box girder

针对2023年3月国铁集团发布时速350公里高速铁路预制后张法预应力混凝土简支箱梁通用参考图,本文分析研究了新旧梁图工程数量的差异,对工程数量的变化情况进行对比分析,进一步根据工程数量对新旧梁图24米跨度和32米跨度的预制简支箱梁的工程造价分别进行测算。最后以江西省某铁路项目为工程实例,分析研究高速铁路预制后张法预应力混凝土简支箱梁新梁图变化对铁路项目投资的影响,并进行技术经济指标分析。

In view of the general reference drawing of prefabricated post-tensioned prestressed concrete simple supported box girder for high-speed railway at 350 km/h released by China National Railway Group in March 2023,this paper analyzes the differences in the number of projects between the old and new beam drawings,and makes a comparative analysis of the changes in the number of projects.According to the number of projects,the project cost of precast simple supported box girder with 24 meter span and 32 meter span is calculated respectively.Finally,taking a railway project in Jiangxi Province as an example,the influence of the change of the new beam diagram of the precast post-tensioned prestressed concrete simple supported box girder on the investment of the railway project is analyzed,and the technical and economic index is analyzed.