Hi,
If you are doing it in loop, you can do as below inside the loop. I hope you are asking this for normal write statement.
write : 20 sy-vline no-gap, t_bseg-sgtxt +0(20) no-gap, sy-vline .
write : /20 sy-vline no-gap, t_bseg-sgtxt +20(10) no-gap, sy-vline.