To provide a detection method capable of visually confirming a tightening pressure on the whole when mounting equipment is mounted on an installation face.
A pressure detection sheet 1 in which a pressure sensitive sheet 2 changing its color (or developing a color) by a pressure is integrally provided on an elastic plate 3 is provided. This pressure detection sheet 1 is inserted between the mounting equipment 4 and the installation face so as to stick out from an outer peripheral fringe of the mounting equipment 4 and is mounted by tightening a bolt 6. The pressure sensitive sheet 2 in a part where the mounting equipment 4 is in contact with a mounting face changes its color by tightening the bolt 6, and the elastic plate 3 is compressed. The elastic plate 3 in a sticking-out part 7 swells and is deformed by the compression of the elastic plate 3, an outer peripheral part of the mounting equipment 4 of the pressure sensitive sheet 2 is discolored by the stress, and the discolored part 8 is confirmed visually or by an optical sensor to detect pressures of the mounting equipment and the installation face.
HAMAMATSU HIROSHI
MIYAGAWA HIDEKAZU
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