| 摘要 |
PROBLEM TO BE SOLVED: To measure a contraction allowance formed in the joint of an aseismatic pipe from the outside in an aseismatic pipeline such as city water, gas, and sewer. SOLUTION: The device is provided with an external pipe and internal pipe slidably inserted in the external pipe. Bill-shaped measuring terminals protruding in the right angled direction against the axial direction are provided at front ends of the internal and external pipes. Graduations by which the relative shift distance of the internal pipe to the external pipe can be measured are made at rear ends of the internal and external pipes. It is preferable that a supporting element with a caster rotatably supporting the external and internal pipes around the axis is provided. COPYRIGHT: (C)2004,JPO
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