Sand bailing mechanism and drilling tool

Abstract

The invention relates to the technical field of geotechnical engineering investigation and geological exploration and discloses a san bailing mechanism. The sand bailing mechanism comprises a bailing bucket which is arranged outside a drill rod and along the axial direction of the drill rod; the bailing bucket comprises a sealing end which is connected with the drill rod and an annular-shaped lateral wall; a gap is formed between the drill rod and the annular-shaped lateral wall, so that sand filling space is formed; an inclined opening is formed in the upper end of the lateral wall; a plurality of sand inlet holes and water outlet holes are formed in the lateral wall. According to the sand bailing mechanism which is arranged on the periphery of the drilling rod, suspending gravel in drilling holes enters into the sand filling space through the inclined opening which is formed in the lateral wall and the sand inlet holes and precipitates in the sand filling space and fluid such as slurry inside the sand filling space is effused through the water outlet holes. The sand bailing mechanism has the advantages of automatically collecting gravel during a process that the drilling tool is drilling holes or tripping out, effectively preventing the gravel precipitating at the hole bottoms, avoiding gravel precipitation causing drilling tool burying accidents, guaranteeing data accuracy of standard penetration tests during an investigation process, enabling the data to reflect characteristics of rock-soil, guaranteeing drilling quality and greatly improving the construction efficiency.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering survey and geological survey, in particular to a sand dredging mechanism and a drilling tool. Background technique [0002] As an important branch of geotechnical engineering, engineering survey is to find out the engineering and hydrogeological conditions of the project construction site, find out the physical and mechanical properties of rock and soil, and provide rock and soil physical and mechanical parameters for design. [0003] At present, the most important and common method used in engineering investigation is core drilling of rock and soil layers. The vertically distributed underground strata are placed in sequence through sequential coring, and professional geotechnical engineers conduct indoor geotechnical engineering through visual identification and sampling. Tests and other methods to find out the characteristics of rock and soil. [0004] At present, core drilling...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a sand fishing mechanism, which aims to solve the problem in the prior art that during the drilling process, the gravel in the

Images