Positioning device for measuring concrete expansion and contraction deformation through non-contact method

The invention relates to the technical field of concrete measurement, in particular to a positioning device for measuring concrete expansion and contraction deformation through a non-contact method. According to the invention, the fixing unit is divided into two parts, namely the fixing primary bin and the measuring secondary bin, and a worker only needs to place the measuring secondary bin into the fixing primary bin through the attraction force between a plurality of magnets which are arranged between the fixing primary bin and the measuring secondary bin and are in one-to-one correspondence, so that the positioning of the measuring secondary bin can be completed; and meanwhile, sponge sheets are arranged in the fixed primary bin and the measurement secondary bin, so that fine vibration is effectively absorbed, and the measurement result is more accurate. A scraping unit is mounted on the fixed primary bin, a sliding block drives a scraping plate to move, and the moving scraping plate scrapes the surface of