| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for controlling the lining thickness of uncured concrete before the removal of forms in a cast-in-place lining method. SOLUTION: An oscillator 29 using a supermagnetostrictive element, and a receiving device 27 are installed in an inner form 13. Undulations, which are generated from the oscillator 29 and reflected from a boundary layer between the concrete 21 and natural ground 19, are received by the receiving device 27; and the lining thickness of the concrete 21 is calculated by the arrival time of the undulations. The lining thickness acquired by measurement is compared with a span of control of set lining thickness. When the lining thickness acquired by the measurement falls out of the span of the control of the set lining thickness, placing pressure applied to the concrete 21 is controlled by controlling the pressure of a press jack 9, and the amount of the concrete 21 to be supplied is controlled by controlling the number of revolutions of a placing pump. The lining thickness of the concrete 21 can be controlled by controlling the placing pressure on the concrete 21 and the amount of the concrete 21 to be supplied. COPYRIGHT: (C)2009,JPO&INPIT
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