INSPECTION SYSTEM FOR UNDER GROUND DUCT

摘要

An inspection system for an underground duct is provided to systematically manage the underground duct and to efficiently perform works related to the underground duct such as an information network system. An inspection system(20) for an underground duct(10) includes a GPS(Global Positioning System) device(21), a digital conduction rod(22), a camera(23), a state measuring unit(24), a distance measuring unit(25), a control unit(26), and a main computer(27). The GPS device measures coordinates of two manholes(11,12) where the underground duct is laid. The digital conduction rod is inserted into the underground duct from the one side manhole to be moved to the other side manhole by a wire or in a self-propelled manner. The camera is mounted on the digital conduction rod to photograph inside the underground duct. The state measuring unit moves together with the digital conduction rod to measure the state of the underground duct. The distance measuring unit measures moved distance of the digital conduction rod. The control unit transmits image photographed by the camera and the information obtained by the state measuring unit. The main computer analyses the laid situation of the underground duct between the coordinates checked by the GPS device by using the distance measured by the distance measuring unit and the information received from the control unit.