Coordinate Monitoring Technology in the Process of Incremental Launching Construction of Curved Steel Box Girder Bridge

Table 1

Classification and content of working conditions.

Construction status	Specific contents
Condition 1	S1 and S2 were hoisted to the top of the temporary pier at the same time, and after welding to form a whole, the ordinary temporary support was removed, which was in the state of a beam with simply supported ends
Condition 2	After connecting S3 to the whole segment, the incremental launching began, and the ends of the S3 were in the maximum cantilever state
Condition 3	Sections one, two, and three were jacked 19.9 m to the specified position under incremental launching, and the front end of section one was in the maximum cantilever state at this time