地铁车站的等电位联结设计探讨

Discussion on Design of Equipotential Bonding in Metro Stations

为了探索出合理的等电位联结,降低人在地铁车站中被电击的危险性,分别对目前地铁车站中等电位联结常见的局部等电位端子板连接成环并与接地母排联结、辅助等电位联结、局部等电位联结端子箱与结构钢筋联结3种设计方案进行分析研究。通过计算分析局部等电位端子板连接成环并与接地母排联结设计方案存在的问题,同时分析另外2种设计方案的缺点,结合相关规范要求,提出更合理的等电位联结做法(辅助等电位联结和局部等电位联结相结合的方式),有效达到电击防护的目的,并得出了各设备房间内的局部等电位联结端子板不应互连成环,且不需另外设置接地电缆与接地母排连接。

Rational equipotential bonding is fundamental for Metro works so as to reduce the risk of electric shocks in Metro stations. In the paper, 3 equipotential bonding manners commonly used in Metro stations, i. e. , connection between local equipotential terminals and earthing busbar, auxiliary equipotential bonding, and connection between local equipotential bonding terminal box and structural reinforcement bars, are analyzed, the disadvantages of these 3 bonding manners are discussed, and a rational equipotential bonding manner, i. e. , a combination of auxiliary equipotential bonding and local equipotential bonding, is proposed on basis of relevant standards. In the end, the electric shock has been effectively avoided. It is also concluded that the local equipotential bonding terminal board should not be intercon- nected, and it is unnecessary to set additional earthing cable to connect the earthing busbar.