新建电气化铁路下穿桥梁净空高度探讨

摘要

既有桥梁在建设时,考虑到成本因素,一般对净空预留较低。新建电气化铁路下穿既有桥梁时,经常会因为净空高度不够而落道,进而产生了很高的土建费用。因此,跨线桥处如何确定接触网净空进而降低土建费用是设计中常常碰到的问题。以新建松陶铁路下穿桥为例,探讨了如何计算最小净空高度。%While the existing bridge is under construction, considering the factor of cost, the clearance is usually reserved lower. When the newly-buih electrified railway goes across the existing bridge, the derailment will happen as headroom is not tall enough. Thus, the cost of civil engineering is raised. How to determine the contact line clearance under the grade separa- ted bridge to lower the cost of civil engineering is mainl problem which we usually come across. In this thesis, the author, takeing the construction of Songtao Railway crossing the bridge for example, discusses how to calculate minimum headroom.