| 摘要 |
PURPOSE: To confirm that a fluid filler is securely charged in a sheltered and hidden space. CONSTITUTION: When grouting 5 on a settled area of concrete-paved slab 1, electromagnetic wave sensors 11 are installed around cement-grouting holes 4 to pour cement from the holes 4. When the poured grout 5 crosses the detecting area of the sensor, the sensor 11 detects the differential change in the dielectric constants of concrete, air in the clearance, and grouting paste and drives a lamp and a buzzer. |
