| 摘要 |
PROBLEM TO BE SOLVED: To provide a measuring instrument which can accurately measure the angle between the bottom face and side face of a form used for forming a concrete specimen (test piece) for strength tests through simple operation. SOLUTION: A measuring instrument is provided with a pedestal 1 having a reference bottom face, a rocking column 2 the base-side end of which is pivoted to the pedestal 1, and a support column 3 erected behind the column 2. The instrument is also provided with a displacement gauge 32 which is fitted to the support column 3 at a prescribed height with its measuring end on the rocking column 2 side, a biasing means 15 which presses the base-side end of the rocking column 2 against the internal surface of a form, and a measuring protrusion 23 provided on the front face of the rocking column 2. In addition, the instrument is also provided with a biasing means 24 which biases the rocking column 2 forward. Since the displacement of the rocking column 2 is measured at the prescribed height, the instrument can easily-y measure the angles of forms having different heights and the biasing means 15 and pressurizing means 24 respectively composed of a spring and a magnet can realize stable high accuracy by fixing the contacting-force of the base-side end of the rocking column 2 and column 2 with the internal surface of the form.
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