Crack three-direction deformation measuring instrument and using method thereof

The invention relates to the technical field of ground survey measuring equipment, in particular to a crack three-way deformation measuring instrument and a using method thereof.The crack three-way deformation measuring instrument comprises a telescopic supporting rod, two sets of mounting rods and a movable connecting piece, and the telescopic supporting rod comprises an inner cylinder and an outer cylinder which are coaxially arranged in a sliding and sleeving mode; a compression spring is arranged between the inner cylinder and the outer cylinder, and a pressure sensor used for detecting the real-time elastic force of the compression spring is arranged in the outer cylinder. The two sets of installation rods are symmetrically installed at the two ends of the telescopic supporting rod, an installation shaft is vertically installed in the middle of each installation rod, the two ends of each installation rod are bent towards the side away from the installation shaft, and a stable supporting mechanism is arra