| 摘要 |
PURPOSE:To raise the measuring accuracy, by installing a displacement meter to a structure so that its tip contacts, flowing cement into the circumference of the structure, coagulating it together with the displacement meter, and measuring a space between the structure and cement, which is caused by contraction of cement. CONSTITUTION:A cylinder 11 is made to tightly adhere to a structure 1, and a cylinder 8 which has stored a displacement meter 9 fixed with a screw 12 is made to tightly adhere to the structure 1 through a screw 13. The cylinder 11 has a projection 7, therfore, when cement 3 is injected into the circumference of the structure 1 and is coagulated, a space 4 is generated between the displacement meter 9 and the structure 1. The space 4 is measured by an ultrasonic wave emitted from the displacement meter 9 by supplying water through a water conveyance tube 14, and filling the space 4 with water 15. In this way, the measuring accuracy is raised. |
