Deformation photographing method for railroad tunnel lining

PURPOSE: To measure the deformation state of the whole tunnel lining face continuously, simply, and precisely by mounting multiple slit illuminations and slit cameras on a track-travelable car body sufficiently overlappingly and radially. CONSTITUTION: Slit cameras 1-5 and illuminations 6-10 for the cameras 1-5 are arranged on a bogie, and a power generator 13, a controller 12, and a noncontact type speed/distance meter 11 are mounted on the vehicle. In a single- track tunnel, the maximum wide-angle lenses presently utilized in slit cameras are used for the cameras 1-5, the reference distance to the tunnel lining face 82 is set to 2.9m for the cameras 1, 2, 4, 5, and the tunnel lining face 82 is photographed at the photographing contraction scale factor of 1/200. The left side wall (40-42) is photographed by the camera 1, the left arch (41-44) by the camera 2, the right arch (43-46) by the camera 5, and the right side wall (45-47) by the camera 4. The cameras 1-5 are arranged at positions corresponding to the reference photographing distance on the standard cross section as a rule. The deformation state of the whole tunnel lining face 82 can be measured continuously, simply, and precisely. COPYRIGHT: (C)1993,JPO&Japio