Mounting method for supporting column caps of containment system liquid cargo tank

The invention discloses a method for installing a strut cap of a liquid cargo tank of an enclosure system, which comprises the following steps of: sleeving a height-fixed installation auxiliary tool outside a strut cylinder, and fixing a panel of the installation auxiliary tool and the strut cap before the strut cap and the strut cylinder are welded and fixed; therefore, the overall assembly height of the pillar cap and the pillar cylinder can be limited by utilizing the height of the mounting auxiliary tool, so that the problem that after 26 groups of pillar caps at a single longitudinal angle are mounted, the planes of three adjacent pillar caps are not on the same horizontal plane and a height difference exists is solved; meanwhile, the adjusting bolt is used for transversely abutting against the strut cylinder from multiple azimuth angles before the strut cap is welded, welding deformation of the strut cylinder can be avoided, and the installation precision of the strut cap is effectively guaranteed. 本发明公