Screw type soil sample pushing device and method

Abstract

The invention discloses a screw type soil sample pushing device and method. The screw type soil sample pushing device comprises a bottom plate, a middle plate, a top plate, a sampling cylinder and a top cover, wherein two sides of the bottom plate, the middle plate and the top plate are coaxially and fixedly connected by supporting columns; a sleeve is arranged on the upper part of the top cover; when a screw propulsion rod is rotated by a runner, the top cover is uniformly stressed, and an effect of guiding the top cover is achieved; a lug plate is arranged on the outer wall of the sampling cylinder, the sampling cylinder is conveniently mounted and centered by virtue of groove matching, and the sampling cylinder can be kept balanced in the soil sampling process; and a tray with a spring is arranged on the bottom plate, and phenomena that a soil sample deforms and is damaged due to sudden drop are avoided due to the supporting effect of the tray and the buffer effect of the spring. A non-slip structure is formed on the runner, the rotating runner is prevented from sliding, and the uniform force application is realized. According to the device and the method disclosed by the invention, the soil sampling efficiency is improved, and the soil sample quality is guaranteed.

Description

technical field [0001] The invention relates to the field of civil engineering, which belongs to a geotechnical test tool, in particular to a screw-type bulldozer sample device and a bulldozer sample method. Background technique [0002] One of the main tasks of engineering geological drilling is to take core or undisturbed soil samples in the rock and soil layer. During the process of taking samples, the natural structure of the sample should be maintained. If the natural structure of the sample is damaged, it is called "disturbance". Sample". Disturbed samples are not allowed in engineering geological exploration, unless it is clearly stated that they are used otherwise, the disturbed samples are invalid. Undisturbed samples of natural structures include core samples and soil samples. The natural structure of core samples is generally not easily damaged, but soil samples are easily disturbed. Therefore, the bulldozing effect of the bulldozing device is often directly re...

AI Technical Summary

Problems solved by technology

[0003] Although the sampling cylinder of the existing soil-taking device is centered with a circle of clamping grooves, however, with the increase in the number of tests, the corresponding part of the clamping grooves where the sampling cylinder is placed is easily covered by scattered soil particles. If it is not fully cleaned before the test, Then the sampling cylinder should not be balanced and centered, and the soil sample will be easily eccentric when it is pressurized and stressed, which will cause the soil sample to be easily damaged during the soil sampling process.

In addition, when the soil sample is pushed out of the sampling cylinder, the soil sample is easy to fall suddenly, resulting in incomplete lower surface of the soil sample

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