Offshore inland river intersection area immersed tube tunnel construction technology

The invention discloses an offshore inland river intersection area immersed tube tunnel construction technology. The offshore inland river intersection area immersed tube tunnel construction technology comprises the following steps that S1, water channel traffic reconciliation and immersed tube tunnel foundation trench excavation and desilting construction are carried out, the immersed tube tunnel foundation trench is excavated and constructed stage by stage, and smooth navigation of at least one side of a water channel is kept; S2, immersed tube joints are prefabricated in a river bank dry dock in batches; S3, floating transportation and sinking installation construction of immersed tube joints are carried out; and S4, immersed tunnel foundation trench backfilling construction is carried out. The problem of navigation coordination of all the river channels in the river intersection area is solved, foundation trench staged construction is carried out according to the floating transportation scheme and the wat