| 摘要 |
PROBLEM TO BE SOLVED: To prevent a sensor placed in the water from laterally vibrating and fluctuating in vertical and lateral directions by supporting a fixed frame body and a movable frame body of a lift for an ultrasonic speed sensor by a plurality of guide rods. SOLUTION: An upper frame 22 of a fixed frame body 21 placed on a building 2 which is a measurement falsework and a lower frame 23 with a mortise 24 provided at a center are supported by, for example, four cylindrical guide rods 25a to 25d, thereby reducing lateral vibration of an ultrasonic sensor 31 due to a water flow. In order to lift the sensor 31 from the water, a lifting rope 46 is wound by a rope drum 43 for pulling a lower frame 28 of a movable frame body 26 toward the frame 22 of the fixed frame body 21, and also a plate 32 of a sensor support frame 34 is pulled toward an upper frame 27 of the movable frame body 26. To lower the sensor 31, a lowering rope 48 is wound by the drum 43 for pulling down the frame 27 of the frame body 26 toward the lower frame 23 of the frame body 21, and also the plate 32 of the frame 34 is pulled down toward the lower frame 28 of the frame body 26. |
