The present invention relates to a bridge drainage structure applicable to a general bridge, to minimize the earth pressure resistance caused by the inflow water generated on the rear of the bridge to extend the bridge life of the bridge and to obtain a bridge backfill drainage structure of the bridge easy to maintain Is for;Due to the inflow water flowing into the backfill part of the bridge, it forms an alternate drainage path which can extend the bridge life by minimizing the damage of the structure caused by the change of earth pressure by the inflow water in the alternating part of the small, large and large bridges. The structure that minimizes displacement of the generated shifts and forms a drainage channel at the base of the shift as a structure more necessary in the inflow strata has the effect of minimizing the earth pressure by quickly discharging the upper inflow of the shift, and also the stepped structure of the backfill It is effective to extend the life of bridges including shifts by using the construction method considering the drainage structure and perforated pipe to earth pressure.
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