| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for measuring the lining thickness of uncured concrete before the removal of an inner form in a cast-in-place lining method. SOLUTION: In the inner form 13, a plurality of openings are provided in a skin plate 23; an openable/closable gate 33 is provided in the opening; and an oscillator 29 using a magnetostrictor, and a receiving device 27 are provided in positions corresponding to the gate 33 on the one side of the skin plate 23. The oscillator 29 oscillates, and the receiving device 27 receives undulations 59 which are reflected from a boundary between the concrete 21 and natural ground 19, so as to measure the lining thickness of the concrete 21. COPYRIGHT: (C)2009,JPO&INPIT
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