Pipe sinking device and pipe sinking method

The invention belongs to the technical field of immersed tubes, and discloses an immersed tube device and an immersed tube method.The two ends of an immersed tube are provided with water inlet valves, the immersed tube device comprises a hoisting mechanism and a built-in buoy, the hoisting mechanism comprises a plurality of hangers and cranes, the hangers are arranged on the immersed tube, the hangers and the cranes are arranged in a one-to-one correspondence mode, and the built-in buoy is arranged in the immersed tube. The crane is located on the two banks and/or the water surface, the built-in buoys are arranged in the immersed tube, the built-in buoys comprise buoys and connecting pieces, the connecting pieces are detachably connected between every two adjacent buoys, the buoys are in a hollow cylindrical shape, and water inlet valves and exhaust valves are arranged on the buoys. According to the immersed tube device, a plurality of hangers are welded on the surface of an immersed tube, and cranes in one-t