An existing railway reinforcement construction method in the jacking process of a box body comprises the following steps: performing grouting treatment to railway
ballast below an existing railway positioned in a to-be-jacked area, moving concrete sleepers, penetrating wooden ties among the concrete sleepers, mounting locking tracks, forming a beam arranging
ditch, penetrating a beam, mounting a longitudinal beam, and the like. The method provided by the invention has the following advantages: the operation of renewing concrete sleepers is reduced, so that the damage to the original road
bed /
track bed is reduced, and the stability of the road
bed is high; the depth of a dug
ditch and the work amount of reinforcement are reduced, the construction period and the on-line
operation time are shortened, and the risk of
personnel safety and running of an existing railway is lowered; grouting solidification can effectively reduce the problem that vibration is caused when a
train passes, so that railway
ballast rolls into the
ditch, and then repeated operation can be avoided; insulating boards of 3 cm in thickness and H-steel of 45 cm in height are arranged at the lower part of a steel rail, so that the reserved space is enlarged, a treatment space is provided for the rising phenomenon that possibly occurs when the box body is jacked, and running safety of the existing railway can be ensured.