Large-span steel structure and metal roof integrated construction method thereof

The invention discloses a large-span steel structure and a metal roof integrated construction method thereof. The method mainly comprises the following steps: (1) reasonably arranging a splicing jig frame and a supporting point of a boundary position on a splicing working surface according to a construction partition, a design boundary and a structure splicing requirement of the large-span steel structure; (2) assembling construction of the large-span steel structure is completed on the assembling jig frame; (3) part of assembly jig frame fulcrums near the boundary of the original support of the large-span steel structure are reserved, and the other assembly jig frame fulcrums are unloaded; (4) completing the installation operation of the metal roof system on the unloaded steel structure; (5) installing corresponding lifting or hoisting construction measures; (6) integrally lifting or hoisting in place; (7) the large-span steel structure and the metal roof are fixed to the supporting structure; and (8) overal