抗电力线路倒塔入侵高速铁路防护方法研究

Research on High-speed Railway Protection Method for the Invasion of the Collapse Tower of Crossed Electricity Lines

电气化铁路建设过程中不可避免与电力线路发生交叉,输电线路杆塔在极端气候环境的影响下,会出现倒塔入侵铁路的情况,威胁铁路运行安全。针对该问题开展研究,建立高等级输电线路杆塔受力模型,获得不平衡力作用下杆塔的应力应变特性,结合倒塔与刚性防护棚洞的冲击力分析,计算防护棚洞的设计强度。研究表明,电力线路地线断线并出现不平衡力时,塔头发生明显变形,当侧导线两相断线后,杆塔重心位置变形最大,碰撞应力随断线数量的增加而增大,最大碰撞力接近900 kN,碰撞时间约0.6 s,结合研究完成了一种抗35 kV电力线路倒塔入侵铁路的防护结构的设计并获得应用,可为电力线路防护棚洞强度设计提供数据支持。

Electrified railways are inevitable crossing with transmission line of electricity power system,and the tower may collapse and invade the railway under extreme climate which threaten the safety.To solve this problem,a tower model with unbalanced force of transmission line was established,and stress and strain characteristics of tower were calculated.The impact of the collapse tower on the protective structure was analyzed and the design strength of the protective casing hole was proposed.The research results show that,when ground wires breaks and unbalanced force occurs,there is obvious deformation on the top of the tower.When there are two phases line broken on the one side of the tower,the deformation appears at the center of gravity position.The maximum impact stress increases with the increase of the number of broken lines,the maximum impact force is nearly 900 kN,and the collision time is close to 0.6 s.A defense structure designed for the tower collapse and invasion of railway with 35 kV power line is proposed and could provide support data to the design of electric power line protection shed hole.