The utility model discloses a forceful electric power of keeping apart can be dismantled in strong and weak electric well of pin -connected panel and rail cable shaft is crossed, the isolation curb plate and isolation bottom plate assembled including cable shaft main part and cable shaft opening draw -in groove department, the cable shaft opening is on the both ends lateral wall of cable shaft main part way along the line direction. After the isolation curb plate inserted the draw -in groove, its top flushed with the lateral wall of cable shaft main part, and its length equals the outer lengthof the way along the line orientation of cable shaft main part. After the isolation bottom plate inserted the draw -in groove, the upper surface flushed with cable duct bottom plate upper surface. The length of keeping apart the bottom plate equals the outer length of the way along the line orientation of cable shaft main part, and the width of keeping apart the bottom plate is the same with theinterior clear width in communication signal groove. Keep apart the curb plate and keep apart the bottom plate and paste the one deck flameproof fabric outside the surface of cable shaft main part inside. The utility model discloses a with the isolation of heavy current cable and light current cable in the cable shaft, threaten the light current cable after having avoided heavy current cable on fire, reduce the influence to the railway operation security.