Drainage pipe structure for water conservancy projects

The utility model belongs to the field of hydraulic engineering equipment, and particularly relates to a drainage pipe structure for hydraulic engineering, which comprises a communication mechanism, the communication mechanism comprises an input pipe and an output pipe, the input pipe and the output pipe are in sealed connection through a filter mechanism, the filter mechanism comprises a filter pipe and a drain pipe, and a lower circulation opening and an upper circulation opening are formed in the filter pipe. The upper circulation port is positioned above the lower circulation port; when the filter screen is used for filtering, the gear motor drives the filter screen to rotate, waterweeds attached to the filter screen are rotated to correspond to the upper circulation opening, the waterweed sludge is crushed through the crushing mechanism, the high-speed motor drives the crushing disc to rotate at a high speed through the transmission shaft, and the crushing disc can crush the waterweed sludge and crush th