| 摘要 |
<P>PROBLEM TO BE SOLVED: To efficiently inspect whether or not the lining thickness of lining concrete to be placed between the inner peripheral surface of a tunnel and a moving mold for lining arranged facing the inner peripheral surface satisfies a set value before placing the lining concrete. <P>SOLUTION: The lining thickness inspection device 1 is installed at an end part 20a at the front in the moving direction of the moving mold 20 for lining. The emission interval of a first laser beam 7 and a second laser beam 8 is adjusted corresponding to the set value of the lining thickness, the first laser beam is emitted in the axial direction of the tunnel along the mold surface of the moving mold for lining, and the second laser beam is emitted in parallel with the first laser beam and separately in a lining thickness direction. Then, a position at which the end face of the lining concrete placed in advance is irradiated with the laser beam is visually confirmed, and when the end face of the lining concrete is irradiated by both laser beams, it is determined that the set value of the lining thickness is satisfied. <P>COPYRIGHT: (C)2012,JPO&INPIT |
