DEVICE FOR MAINTAINING LARGE-DIAMETER PIPE

PROBLEM TO BE SOLVED: To make it possible to execute the easy movement in pipes to improve the workability and to efficiently execute the cleaning to remove the deposits in pipings, the recovery thereof, etc., by using the intricate large-diameter pipes connected with plural pipes, such as large-diameter pipes, horizontal pipes, inclined pipes, perpendicular pipes, particularly including elbow pipe-shaped bent pipes, etc. as an objective. SOLUTION: This device for maintaining the large-diameter pipes is constituted by mounting a working mechanism for executing washing and other maintenance on a moving body 11 which is inserted into the large diameter pipe 10 to be maintained and moves axially in the pipe. The moving body 11 has at least a pair of front and rear moving body elements 15, 16 which may be selectively fixed in the pipe and moved in the pipe. The respective moving body elements are connected to each other by a connector 17 which is capable of making expanding and contracting action and curving action. In addition, the elements have the functions to turn relatively around the axial center of the connector.