The present invention relates to a drainage structure of a bridge, which is a conventional bridge drainage structure consisting of a collecting pipe installed on the bridge top plate for drainage and a drain pipe coupled to the collecting pipe;;An inclined circumferential surface is formed in which the diameter gradually narrows from a predetermined height of the collecting pipe to a pipe end, and a binding groove is formed in the entire circumferential outer surface of the predetermined height at the top of the inclined circumferential surface. A collecting pipe member having a male spiral formed thereon; Fixing protrusions are formed on the entire inner circumference of the tube circumference to be coupled to the binding groove of the collecting pipe member, and a plurality of incision grooves of a predetermined length are formed on the outer circumference of the tube circumference so that the inlet part can be easily opened. A drain pipe member having a male spiral formed on the entire outer circumference of the tube from the upper end of the tube to the incision groove; It is composed of a nut coupling member spirally coupled to a male spiral formed on the collecting pipe member and a male spiral formed on the drain pipe member in order to further strengthen the coupling groove of the collecting pipe member and the fixing protrusion of the drain pipe member. In this way, it is possible to facilitate the installation and disassembly of the drain pipe coupled to the water collection pipe, in particular by the weight of the drain pipe member fixed to the water collection pipe member is separated from the water pipe member as in the prior art by the drain pipe member Rainwater introduced from the collecting pipe member does not flow to the drain pipe member, and there is an excellent effect of preventing the discharge of rainwater between the separated collection pipe and the drain pipe.
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