SAMPLING DEVICE FOR GEOTECHNICAL INVESTIGATIONS

摘要

A sampling device for geotechnical investigations, comprising a box body (1), a sampling drill bit (2), a drive mechanism, a depth measurement mechanism, and a water pump (3). The box body (1) is divided into a working cavity (5) and a sampling cavity (6). The depth measurement mechanism comprises an annular plate (15), a transmitting tube (16), and a receiving tube (17). Before sampling, the depth of the soil to be sampled is determined for the geotechnical structure to be constructed; after a device main body is moved to an area for sampling, water in the sampling cavity (6) is pumped by means of the water pump (3), and then the drive mechanism drives the sampling drill bit (2) to be inserted into the soil, and the annular plate (15) arranged on the outer wall of the sampling drill bit (2) is blocked on the surface of the soil, so that the distance between the transmitting tube (16) and the receiving tube (17) is increased; the height of the annular plate (15) from the surface of the soil can be obtained according to the time when the transmitting tube (16) emits infrared light and the time when the receiving tube (17) receives the infrared light, so that the depth where the sampling drill bit (2) is inserted into the soil can be obtained; sampling can be performed after the sampling drill bit (2) reaches a predetermined depth. It is guaranteed that the sampled soil sample can correctly reflect the base layer property.