Sampling device for geotechnical investigation

The invention relates to the technical field of geological investigation, and discloses a geotechnical investigation sampling device which comprises a sampling pipe and a fixing pipe, and the sampling pipe is sleeved with the fixing pipe and used for sampling soil; the fixed pipe comprises a plurality of sections of inner pipes and a plurality of sections of outer pipes which are mutually connected, each inner pipe comprises an inner pipe body and a check ring, each check ring is fixedly connected to the middle of the outer side wall of the corresponding inner pipe body, two sections of outer pipes are connected to the positions, on the two sides of each check ring, of the outer side wall of each inner pipe body respectively, and the outer pipes abut against the check rings. The invention further provides a sampling device for geotechnical investigation, the sampling device comprises a sampling pipe and a fixing pipe, and the sampling pipe is sleeved with the fixing pipe and used for sampling soil; the fixed