The invention relates to the field of railway systems, in particular to a maintenance assisting method without affecting vehicle traffic. An adjustment structure comprises a fixing structure capable of internal and external pressing; the fixing structure capable of internal and external pressing comprises a middle structure; a motor (11) facing upward is arranged on a case of the middle structure;the motor (11) facing upward comprises a power shaft; a power bevel gear (10) is fixed on the power shaft; the power bevel gear (10) drives systems on two sides to move together; the systems on two sides comprise pressing bevel gears, horizontal threaded shafts (9) and side structures; the case facing upward of the middle structure capable of internal pressing and external pressing comprises a jack groove (12); a jack can be placed in the jack groove (12); and the jack can hold up a wheelset upward.