Device for rapidly measuring ring forming roundness of pre-embedded socket-and-spigot pipe piece

The utility model relates to the technical field of tunnel and underground engineering, in particular to a rapid measuring device for the ring forming roundness of a pre-embedded socket-and-spigot pipe piece, which comprises a reference marker post and a measuring scale, the reference marker post and the measuring scale are vertically arranged and are in sliding fit connection, so that the measuring scale can slide in the length direction of a rod body vertical to the reference marker post, and the reference marker post is provided with a measuring reference line arranged in the length direction of the rod body of the reference marker post; the measuring scale is provided with a reading area for a segment convergence value and a segment fitting radius. The utility model has the advantages that the ring forming roundness value of any two adjacent duct pieces can be quickly measured, the splicing personnel can be guided in real time to adjust the splicing precision of the duct pieces in time, and the engineerin