Annular water inlet thin wall soil sampler and use method thereof

Abstract

The invention discloses an annular water inlet thin wall soil sampler and a use method thereof. The annular water inlet thin wall soil sampler comprises a drill rod joint pipe, an annular water inlet pipe cap, a waste soil room pipe, a thin wall sampling pipe and a safety bolt, wherein one end of the annular water inlet pipe cap is connected with the bottom end of the drill rod joint pipe; the other end of the annular water inlet pipe cap is connected with one end of the waste soil room pipe; the other end of the waste soil room pipe is connected with the thin wall sampling pipe; a circle of water inlet through holes are formed in the annular water inlet pipe cap along the circumference of the annular water inlet pipe cap. During use of the annular water inlet thin wall soil sampler, water is fed through the annular water inlet pipe cap in a static pressure process for flushing a pipe wall, thereby preventing waste soil from entering the waste soil room pipe and the thin-wall sampling pipe in the static pressure process; when the annular water inlet thin wall soil sampler is pressed to a position which is 30cm away from a sampling depth, water feeding is stopped, the thin wall sampling pipe is pressed to the sampling depth rapidly and uniformly, the safety bolt is placed into the drill rod joint pipe, the thin wall soil sampler is lifted, and a vacuum environment is formed in the whole thin wall soil sampler through the safety bolt, so that a sample is prevented from falling under the action of vacuum suction.

Description

technical field [0001] The invention belongs to the technical field of devices for collecting undisturbed soil samples in geotechnical engineering drilling, and in particular relates to a ring-type water-inlet thin-wall soil fetcher and a use method thereof. Background technique [0002] In the field of geotechnical engineering investigation, in order to understand the physical and mechanical properties of the natural state of the underground soil, it is usually necessary to take undisturbed soil samples for indoor physical and mechanical index tests. The quality of undisturbed soil samples is directly related to the accuracy of the experimental results. Different soil fetchers are special tools to ensure that high-quality undisturbed soil samples are taken for different soil properties. [0003] According to the wall thickness, earth takers are divided into thin-walled and thick-walled, and according to the drilling method, they are divided into penetrating type and rotary...

AI Technical Summary

Problems solved by technology

The open type thin-walled soil fetcher has a good application in the exploration of homogeneous soft soil, but in the exploration of heterogeneous soft soil, because the waste soil cannot overflow from the waste soil chamber in time during the drilling process, the waste soil chamber Residual waste soil, the undisturbed soil sample cannot enter the thin-walled soil sample tube well, resulting in the length of the undisturbed soil sample cannot be guaranteed, and the sampling quality is not high

In addition, during the process of lifting the soil sample, there is a risk of sample loss

[0005] In the actual exploration in my country, in order to sample quickly, the soft plastic soil is generally collected directly with a core tube. The soil sample obtained by using a thick-walled core tube is relatively disturbed and the quality of the soil sample cannot be guaranteed.

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