| 摘要 |
The present invention provides a cylindrical tube probing device (P) having a casing with a camera and wheel members disposed on the casing. When a spacing between the wheel members disposed at respective sides of the casing is enlarged, support frames (4A), (4B) which are disposed on said casing and on which the respective wheel members are disposed are moved in a vertical direction in unison with the enlarging or contracting motion. A center of a lens (2a) disposed in the camera is located at a center (t2),(t3) of a cylindrical tube (T1), (T2). Therefore, the tube probing device can be placed in a tube of an arbitrary diameter buried in the ground without the need to increase the distance the wheel members are moved for enlargement or contraction.
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