Final joint of immersed tunnel as well as prefabrication method and installation method

A final joint of an immersed tunnel, comprising:

• two end surfaces connected with installed adjacent tube sections;
• water stop systems on the end surfaces connected with the installed adjacent tube sections;
• and
• a tube section I and a tube section II connected with each other, wherein:
• the two end surfaces are both tilted surfaces,
• connection surfaces of the tube section I and the tube section II are tilted surfaces respectively connected with the installed adjacent tube sections, so that the longitudinal profile of the final joint jointly formed by the tube section I and the tube section II along an installation direction has an inverted trapezoid structure,
• the water stop systems comprise push devices on the connection surface of the tube section I or/and the tube section II,
• the final joint of the immersed tunnel further comprises a circular water stop band outside each push device, and
• the push devices comprise jacks on the connection surfaces of the tube section I and the tube section II, and
• the jacks comprise piston rods, pushing joists and joist sliding blocks, wherein the piston rods are connected with the pushing joists, and the pushing joists are respectively connected to the connection surfaces of the tube section I and the tube section II through the joist sliding blocks.

A final joint of an immersed tunnel, comprising:

• two end surfaces connected with installed adjacent tube sections;
• a tube section I and a tube section II connected with each other;
• water stop systems on the two end surfaces connected with the installed adjacent tube sections and on end surfaces of the tube section I and the tube section II, wherein:
• the two end surfaces are both tilted surfaces
• connection surfaces of the tube section I and the tube section II are tilted surfaces respectively connected with the installed adjacent tube sections, so that the longitudinal profile of the final joint jointly formed by the tube section I and the tube section II along an installation direction has an inverted trapezoid structure,
• the water stop systems comprise (i) push devices on at least one of the connection surfaces of the tube section I and the tube section II and (ii) a circular water stop band outside each push device,
• the tube section I and the tube section II include at least two backup pipelines that penetrate through the tube sections I and II along a longitudinal direction,
• the backup pipelines include prestressed tendons,
• the tube section I and the tube section II are hollow and further include (i) inner cavities and (ii) end seal doors in the inner cavities,
• the tube section I and/or the tube section II comprise(s) a metal shell body and a plurality of transverse diaphragms and longitudinal diaphragms in the metal shell body, wherein the transverse diaphragms and longitudinal diaphragms divide the metal shell body into a plurality of closed compartments, and
• each closed compartment comprises concrete pouring holes and exhaust holes, and is filled with concrete.