Assembly method of long-span truss

An assembly method of a long-span truss, the assembly method comprising:

• S1:
• pre-assembling column-top trusses on column tops of structural columns;
• S2:
• assembling middle trusses on platforms between adjacent structural columns the structural columns;
• S3:
• installing column-top hydraulic lifting devices on the column-top trusses, wherein column-top trusses at end portions of the column-top trusses each are mounted with a corresponding one of the column-top hydraulic lifting devices on one side, and each of others of the column-top trusses in a middle portion is mounted with corresponding ones of the column-top hydraulic lifting devices on both sides;
• S4:
• providing hoisting points at both ends of each of the middle trusses;
• S5:
• connecting each of the column-top hydraulic lifting devices to a corresponding one of the hoisting points;
• S6:
• lifting the middle trusses to a designed height;
• S7:
• connecting the middle trusses to the column-top trusses respectively;
• and
• S8:
• dismantling the column-top hydraulic lifting devices.