The invention discloses a method for installing a spatial-bending-joint discontinuous tubular truss. The method comprises: step one,
steel plates are laid at a construction site and an assembling platform is built; step two, spatial coordinate values of nodes 1,2,3,4,5,6,7, and 8 of a front
pipe truss and a rear
pipe truss are calculated and the nodes 1,2, and 3 among the opposite nodes of the front
pipe truss and the rear pipe truss form a
reference surface; step three, altitude differences of the nodes 4, 5, 6, 7, and 8 relative to the
reference surface and horizontal relative coordinates ofthe nodes are calculated based on the
reference surface, and relative heights of all support columns in a front
bed jig and a rear
bed jig on the assembling platform are determined according to the relative coordinates of all nodes and the reference surface; step four, front and rear pipe truss assembling,
welding and correction are carried out on support columns of the front
bed jig and the rearbed jig respectively; and the front pipe truss and the rear pipe truss are fixedly connected by profile steel members; step five, overall hoisting, installation preparation, and
welding are carried out on the front pipe truss and the rear pipe truss; and step six, the profile steel members are removed. Therefore, the construction quality and construction safety are ensured; the construction schedule and installation precision are improved; and the construction cost is lowered.