The invention discloses a sunken
pipe assembling method for making a pipeline pass through a river, and belongs to the technical field of
underwater pipeline laying. The method includes the steps that first, pipes are arranged for the pipeline, the
assembly procedure includes the pre-
assembly process and the pontoon
assembly process, the first pre-assembly pipeline and the second pre-assembly pipeline are assembled beside the
bank of the river, position point information is marked on the end face of each pre-assembly pipeline, and a first
river bed straight
pipe segment and a second
river bed straight
pipe segment are assembled on a platform of a pontoon; second, pipe sinking is performed for the pipeline, the overall pipeline sinking technology is adopted in the pipeline sinking process, a first
buoy is tied to a first
elbow segment on the pipeline, a second
buoy is tied to a second
elbow segment, and by controlling a first valve, a second valve, the first
buoy and the second buoy always in the center line of a pipe
ditch, it is guaranteed that the pipeline accurately sinks into the pipe
ditch. With the method, the whole pipeline can be accurately controlled to sink into the assigned pipe
ditch, and the control accuracy is high.