To enable cutting even when a reconstruction device meets a steel collar and a pouring socket and prevent operation of an excavator from being stopped due to jacking of a new pipe even when jacking the new pipe to enable smooth reconstruction of a pipe.
A starting shaft and an arrival shaft are newly provided adjacent to respective inner sides of an existing manhole to be reconstructed. A freely running cutting machine provided with a plurality of rotary blades runs in the existing pipe from the starting shaft to cut the existing pipe and a connection member by the rotary blades. Filler is filled into a space in the existing pipe cut simultaneously with the cutting. The existing pipe after filling is crushed by the jacking type excavator, and the new pipe being a jacking pipe is jacked from the rear while excavating the existing pipe and filler to replace the existing pipe with the new pipe.
TOKIEDA NAOTO
MIZUTA SHINICHI
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