Water drainage and pressure reduction structure for water-rich section of highway tunnel

The utility model discloses a highway tunnel water-rich section drainage and pressure reduction structure, a central ditch is arranged in a highway tunnel, the drainage and pressure reduction structure comprises a water collection tank, a filter layer, a vertical drainage pipe and a transverse drainage pipe, the water collection tank is buried at the bottom of the highway tunnel, and water seepage holes are formed in the bottom of the water collection tank; the filter layer is laid on the bottom surface of the water collecting tank; the transverse drainage pipe is arranged on the side wall of the central ditch and is communicated with the central ditch; the top of the vertical drainage pipe is connected to the transverse drainage pipe, and the bottom extends into the water collecting tank to be communicated with the water collecting tank. When the operation highway tunnel is in a water-rich period, underground water is cleaned through the tunnel bottom pebble filtering layer and the grating filtering layer an