Concatenate in ECC 6 - Verif. Unicode active

Hello,

How do you convert this code, to "ABAP unicode code active" ....

Data: lv_txt TYPE text100,

lv_tab TYPE x VALUE '09'.

CONCATENATE var1 var2 var3 var4 INTO lv_txt SEPARATED BY lv_tab

¿ ?

With Unicode, ABAP instruction "concatenate" only accept character types ...

How do you form a file by example separated with tabs or with the caracter " ' "

or another ascii character ?

thanks !