Covering layer sampling device

Abstract

The invention relates to a covering layer sampling device, which comprises a sampling drill (1) on the end part, a sampler outer pipe (3), a residual soil pipe (7), an outer pipe joint (6) positioned between the sampler outer pipe (3) and the residual soil pipe (7), and a core-like inner cylinder (4) positioned on the inner wall of the sampler outer pipe (3), wherein a position stopping ring (5) is positioned on the inner wall of the sampler outer pipe (3) and between the outer pipe joint (6) and the core-like inner cylinder (4), the upper end of the residual soil pipe (7) is fixed with a cover head (8), the upper end of the cover head (8) is provided with a reducing joint (9), and the sampling drill (1) is an alloy drill with a quenching treatment or a normalizing treatment. The covering layer sampling device of the present invention has the following advantages that: adaptability on stratum is wide, no disturbance is generated to the rock sample, layer mixing of the upper layer and the lower layer is not generated, the original gradation and the original structure are maintained, representativeness of the rock sample is strong, requirements of geological description and rock sample tests can be met, and the sampler has characteristics of simple and reasonable structure, easy operation, and high sampling success rate.

Description

technical field [0001] The invention belongs to the field of engineering geological survey, more specifically it is a cover layer sampler. Background technique [0002] Loose rock and soil overburden is a medium that human engineering activities often face. In the investigation of engineering construction, it is an important technical content to be completed in the stage of engineering geological investigation to find out the material composition, structural characteristics, particle gradation, physical and mechanical properties of this medium by means of exploration and taking out the original structure rock samples. . [0003] The material composition and structure of the overburden are generally complex, with uneven hardness, uneven particle size, looseness and fragmentation, and large layer changes. Erosion, wear, loose and broken, difficult to get stuck, etc. Therefore, coring and sampling of the overburden, especially taking out the original structural samples that m...

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Problems solved by technology

[0004] At present, there are several undisturbed samplers in China, which have been proved to have a certain scope of application by trial use, and are generally more suitable for single soft rock overburdens, such as relatively pure sand layers, soil layers or heavy mud. Small-sized crushed stone layers, etc.; because the sampling bits of these samplers are mostly made of ordinary steel, and the clamping devices are mostly used in the form of circlip type, claw spring type, spring type, etc., they are not suitable to withstand the bumping and impact of hard rock blocks, etc. Therefore, it is not effective for mixed hard rocks such as sandy pebble layer, crushed stone layer, gravel layer, sand interbedded stone layer, mud interlayered rock layer, etc. These samplers will be used in formations containing more stones If the sampling drill bit or clamping device is damaged, it is not easy to take out the ideal original structure sample

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