Undisturbed soil sampler at field geological section

Abstract

The invention discloses an undisturbed soil sampler at the field geological section. The undisturbed soil sampler comprises a rack provided with positioning pins and guide sleeves, wherein a rotatable connecting rod penetrates through the rack; one end of the connecting rod is provided with a crank handle, and the other end of the connecting rod is provided with a first bevel gear; a second bevel gear which is meshed with the first bevel gear and is vertical to the first bevel gear is connected with the middle part of a lead screw by a spline; the lower part of the lead screw penetrates through a lead screw guider fixedly connected with the rack and is fixedly connected with a hollow drill, and the drill is internally provided with a piston; the lead screw guider is provided with internal threads, and the lower part of the lead screw is provided with threads matched with the internal threads; and a pushing lead screw with a handle is also connected with the upper part of the lead screw by the internal threads, and can extend into the drill to push the piston. The undisturbed soil sampler disclosed by the invention has the advantages that when in soil sampling, power is input by manually shaking one power input end of the crank handle, rotation and axial feeding and retreat movement of the drill are realized, and the change of the moving state is realized by providing forward and reverse torque, so that the sampling is convenient to carry out.

Description

technical field [0001] The invention belongs to the technical field of undisturbed soil fetching, and relates to an undisturbed soil fetching device for field geological sections. Background technique [0002] Since K. Terzaghi put forward the effective stress principle in 1923, modern soil mechanics has made great progress. In 1963, Roscoe proposed the famous Cambridge model for remodeling clay, which pushed the research of soil mechanics to a new climax, and also opened the door of modern soil mechanics research. The emergence and development of soil mechanics are actually based on experiments, especially the early laboratory experiments laid a solid foundation for the subsequent theoretical research on soil mechanics. [0003] In order to obtain the real physical and mechanical indicators of the soil, in-situ testing is very necessary. However, considering economic and technical reasons, as well as the inherent fragmentation, heterogeneity, and variability of soil, it i...

AI Technical Summary

Problems solved by technology

In order to reduce disturbance to the undisturbed soil, sufficient width must be excavated on the left, right, top, and rear of the hexahedron, and the rear is buried deep in the soil, resulting in a narrow working surface, which is difficult for ordinary tools to complete the task, and a large-scale excavation Digging can also easily lead to collapse, causing great safety hazards to field workers

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