Method and device for rapidly measuring springback value of tunnel sprayed concrete

The invention relates to the technical field of tunnel construction, in particular to a method and device for rapidly measuring the springback value of tunnel sprayed concrete, and the method comprises the steps: carrying out the three-dimensional laser scanning of an absolute position point of an original ground in a spraying area, obtaining the point cloud data of the original ground, and building a model of the original ground; recording the volume V1 of sprayed concrete in actual use; three-dimensional laser scanning is carried out on the absolute position point of the ground after spraying of the spraying area is completed, point cloud data of the ground after spraying is obtained, and a model of the ground after spraying is completed is established; superposing the model of the original ground and the model of the ground after spraying to obtain a volume V2 between the two ground models; and calculating the springback rate K of the sprayed concrete, wherein K = V2/V1. A model can be established and the