| 摘要 |
<p>A transducer is foreseen comprising a rod (1) having at one end a bearing head (1a) on the rock, while the other end (3) acts on a charging cell (20). The transducer is provided in addition with an expander (2) integral with the charging cell on which the end (3) of the rod acts, the said expander (2) being realized in such a way as to fix the charging cell with respect to the civil engineering works (13). Preferably the charging cell (20) comprises a demultiplier (6) downstream of which a piezoelectrical bridge detector (8) is provided.</p> |
