Contact method concrete expansion and shrinkage detection device and method based on laser ranging

Abstract

The invention provides a contact method concrete expansion and shrinkage detection device and method based on laser ranging. The device comprises a base, a laser ranging assembly arranged on the base, a driving mechanism and a correction mechanism. The driving mechanism and the laser ranging assembly are oppositely arranged on the base to form a placement space of a test piece, and the driving mechanism is used for clamping the test piece; the correction mechanism is arranged along the arrangement direction of the test piece. By arranging the correction mechanism, correction can be carried out before measurement each time, personal errors are reduced, it can be guaranteed that the center axis is in the measurement direction, and the detection accuracy is improved.

Description

technical field [0001] The present disclosure relates to the relevant technical field of concrete deformation detection, and in particular, relates to a laser ranging-based contact method concrete expansion and contraction detection device and method. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] The concrete expansion and contraction detection device is a special device for measuring the volume or length change of the concrete specimen during the hardening process. In the early stage of setting or during the hardening process, the volume of concrete materials will change due to the influence of the external environment and the characteristics of the material itself. The volume change of concrete materials will seriously affect the stability, durability and bearing capacity of concrete structures, thereby threatening engineering safet...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned horizontal and vertical devices have the following defects: the use of the horizontal concrete expansion and contraction instrument requires the tester to manually place the specimen on the base of the expansion and contraction device, which cannot ensure that the central axis of the concrete specimen and the central axis of the dial indicator are in the same vertical direction. face-on, which can significantly affect the accuracy of test results

In addition, using this test method requires testers to perform repeated tests to obtain stable values, and there may be small differences that are difficult to detect between multiple tests, which will make it difficult for the relative position of the concrete specimen and the base during repeated tests to be the same as the previous test. The location remains the same, which may have a certain impact on the final test results

Although the use of the vertical concrete expansion and contraction instrument can avoid the above problems, reduce the accidental errors caused by artificial factors, and make the test results more accurate, but the vertical concrete expansion and contraction instrument is greatly affected by environmental factors. or in harsh environments such as low temperature and low pressure, or in a dusty environment, it cannot be used

Moreover, the vertical concrete expansion and contraction meter is extremely sensitive to vibration, and the use environment is relatively limited

Both the horizontal concrete expansion and contraction meter and the vertical concrete expansion and contraction meter need to use embedded parts for positioning. The looseness and slippage between the embedded parts and the concrete specimen will have a huge impact on the measurement of concrete expansion and contraction

Moreover, the accuracy of the two test devices depends to a large extent on the accuracy of the dial indicator. The two test devices can basically only be carried out at room temperature (20±2)°C and relative humidity (60±5)%. , the application scenario is limited by the environment

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