| 摘要 |
PROBLEM TO BE SOLVED: To provide a pipe bore diameter measuring device capable of directly measuring a change (change quantity) in pipe bore diameter through a displacement gauge, performing accurate measurement regardless of the magnitude of the displacement quantity, and being effectively applied to, particularly, bore diameter measurement of an existing conduit with relatively large bore diameter change, for example, an existing sewage conduit with minor bore diameter. SOLUTION: This device comprises a body part set on the axial line within a pipe of measuring object; a centering means for regularly holding the body part on the axial line within the pipe; a plurality of contacts arranged in a plurality of positions on the circumference of the body part; holding and pressing means protruded radially (in pipe diameter direction) from a plurality of positions on the body part, each of the means independently holding each contact to be linearly movable in the pipe diameter direction in the protruded state, and independently pressing the contact to the pipe inner surface in an optionally moved position; a plurality of displacement gauges set on the body part so that measuring parts are linearly movable in the pipe axial direction; and a movement transmitting means linearly moving the measurement parts of the displacement gauges by a quantity corresponding to the linear moving quantity in the pipe diameter direction according to the linear movement of the contacts in the pipe diameter direction. COPYRIGHT: (C)2005,JPO&NCIPI
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