Combined type sinking barge and assembling method thereof

The invention relates to a combined type sinking barge and an assembling method thereof, and belongs to the technical field of immersed tube tunnel construction. The combined type sinking barge comprises a ship body and a cross beam moving mechanism, the ship body comprises two floating bodies and two cross beams, the cross beams are detachably connected with the floating bodies, and the two cross beams are detachably connected to form a combined body; the cross beam moving mechanism is used for moving the second cross beam to the second longitudinal ends of the floating bodies after the first cross beam and the second cross beam are detached when the combined body is supported between the first longitudinal ends of the two floating bodies; a group of cross beam moving mechanisms are respectively arranged between the longitudinal second ends of the two floating bodies and the second cross beam; each group of cross beam moving mechanism comprises traction wheels arranged at the longitudinal second ends of the