Undisturbed soil sampler and sampling method

Abstract

The invention relates to an undisturbed soil sampler and a sampling method. The undisturbed soil sampler comprises a drill bit, wherein the drill bit is connected with one end of a drill rod, and the other end of the drill rod is connected with a power box for driving the drill rod to rotate; the drill bit comprises a soil container connected with the drill rod, and a tool bit arranged at the end part of the soil container and used for cutting soil; the side wall of the soil container is provided with a soil cutter in an embedding manner, and the edge direction of the soil cutter is perpendicular to the axis of the soil container; and the soil cutter is connected with a mover driving the soil cutter to rotate and enabling the tool bit at the front end of the soil cutter to transversely cut into the soil in the soil container. The drill rod is driven by the power box to rotate, and the drill rod can drive the tool bit to rotate so as to cut the soil; by virtue of the rotation of the drill bit, the soil at the center enters the soil container, the soil after the drilling can be completely taken out by virtue of the soil container, the situation that the drill rod cannot be unplugged is avoided, a hole position is prevented from being changed in the drilling process, and the drilling efficiency and quality can be improved. By adopting the undisturbed soil sampler and the sampling method, an undisturbed soil sample can be obtained in the case of little disturbance.

Description

【Technical field】 [0001] The invention belongs to the field of soil extractors, in particular to an undisturbed soil extractor and a sampling method. 【Background technique】 [0002] In the foundation engineering, subgrade engineering and geotechnical engineering, due to the poor coordination of the previous work, the required instruments were not buried in a certain depth near the original subgrade or the original ground, resulting in the inability to perform monitoring in the later stage. It has a great effect; or to obtain more field data on the original basis, it is necessary to arrange a group of monitoring instruments on a certain section, and the instrument must be installed in the predetermined position through drilling, so drilling is particularly important. important. However, due to the limitation of the site and the consideration of the economy, the advantages of the portable soil drill will be obvious when selecting the drilling equipment and performance. At pr...

AI Technical Summary

Problems solved by technology

At present, the commonly used drilling tools in engineering are mechanical drilling rigs and Luoyang shovels, but these two drilling tools have their own limitations. In complex and changeable construction sites, they often cannot complete drilling operations well.

[0003] The limitation of the mechanical drilling rig is that it has high requirements on the construction site, and it needs a flat and wide site to carry out the drilling operation. In the case of limited space, the mechanical drilling rig cannot be used, and the basic quality requirements of the personnel are high, and the costs incurred later larger

[0004] The limitations of the Luoyang shovel are: (1) In principle, the Luoyang shovel digging is a process in which the front end of the Luoyang shovel continuously impacts and breaks the soil, and most of its energy is wasted in the process of impacting the soil, so it is a waste of manpower, and in The excavation process requires the cooperation of multiple people to complete

(2) During the excavation process of Luoyang shovel, due to the downward action of the shovel body due to its own weight, the hole extends downward. Therefore, it is difficult to remove the slag when digging to a deep level. The slag accumulates at the back end of the Luoyang shovel, causing the Luoyang shovel to get stuck in the hole

(3) From the actual drilling at the site, it is known that Luoyang shoveling soil also has requirements on the water content of the soil. It seems to go down very deep, but in fact, due to the influence of the matrix suction between the lower soil, the soil cannot be pulled out at all; if the water content of the soil is small, the force exerted by outsiders is not enough to break the lower soil. Affect the drilling speed and the quality of the hole; in addition, when the Luoyang shovel is used to drill the soil, due to the continuous impact, the soil at the predetermined depth will be greatly disturbed, which will reduce the physical and mechanical properties of the undisturbed soil

[0005] Therefore, the current geotechnical engineering field lacks a soil drill that is economically adaptable, easy to carry, easy to install, and does not require high basic quality of personnel.

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