Calibrating device for concrete test piece and jack on creep instrument

Abstract

The invention discloses a device for calibrating a concrete test piece and a jack on a creep instrument, and relates to the field of building detection, the device for calibrating the concrete test piece and the jack on the creep instrument comprises a thin disc with the diameter of 20cm and a hole in the middle, and three supporting rods with the length range of 10-30cm, each supporting rod is formed by connecting two sections of steel pipes with the diameters of 1cm and 2cm in a sleeved mode, the length of the supporting rods is controlled through bolts and plugs, the supporting rods are hinged to the three magnetic suction cup bases and the thin disc in the same mode, and a support can be rotated up and down. A plumb bob coil is fixed on the upper side of the steel plate, a kite coil principle is adopted as the coil principle, a kite line or a fishing line can be adopted as the line, and the tail end of the line is connected with a small plumb bob. The coil is rotated to reach a test calibration position, a closing line is pulled, and the position of a plumb line is fixed; and after the calibration step is finished, an opening line is pulled, the plumb line is released, and the coil is rotated o withdraw the plumb line, thereby facilitating the next test operation.

Description

technical field [0001] The invention relates to the field of building detection, in particular to a calibration device for concrete specimens and jacks on a creep meter. Background technique [0002] Based on the sampling in construction and the experimental research conducted by researchers in the laboratory, the accuracy is one of the important issues we need to solve at present. We can improve and avoid the errors on the measuring instruments through preventive measures. . After long-term loading, the creep of concrete has a great impact on the building, so it is particularly important to analyze the time data of the concrete creep deformation process. The creep meter used in the test is XBJ-500, and the axial compression of the creep test puts forward requirements for the center calibration of the specimen and the jack. However, this type of creep meter has some defects in the calibration of the specimen and the jack, which makes the research data affected by the inacc...

AI Technical Summary

Problems solved by technology

However, artificially adjusting the positions of concrete specimens and jacks is difficult to ensure the accuracy requirements, which may cause eccentric compression, which will affect the test results;

[0006] (3) The creep test is carried out with a creep meter, and when steel balls are used to level the axis of the specimen under pressure, the test force generated by the action of the jack will cause the steel balls to generate a huge compressive force on the backing plate, and the backing plate will be chiseled through and protruded. The stress concentration of the specimen makes the concrete specimen cracked and affects the test data, making subsequent data collection impossible

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