Single-action double-pipe soil sampling device for improving engineering investigation drilling sampling efficiency

Abstract

The utility model discloses a single-action double-pipe soil sampling device capable of improving engineering investigation drilling sampling efficiency. The single-action double-pipe soil sampling device comprises a drill rod and a drill bit arranged at one end of the drill rod. The drill rod comprises an outer pipe connected with the drill bit and an inner pipe fixedly connected into the outer pipe, a slurry groove is spirally formed in the inner wall of the outer pipe, a slurry channel communicated with the slurry groove is formed in the top end of the outer pipe, and an exhaust hole communicated with the interior of the inner pipe is further formed in the outer pipe. The slurry channel is additionally arranged on the inner wall of the outer pipe, the outer wall is connected with the drill bit through the bearing, the drill bit rotates at a high speed to cut a stratum under the impact of slurry accelerated by the slurry channel, an annular gap is formed, a rock-soil sample reserved in the annular gap enters the inner pipe and is the most original protective rock-soil sample, the coring quality is improved, and the coring efficiency is improved. During drilling operation, the drill rod does not rotate, and when the drilling depth reaches the coring length of the single-action double-pipe drilling tool, a rock-soil sample is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering survey drilling construction, in particular to a single-action double-tube soil sampling device for improving the efficiency of engineering survey drilling sampling. Background Art

[0002] Engineering surveying has a nearly 80-year history in my country. As a discipline that provides the most fundamental parameters for engineering design and construction during the earliest stages of infrastructure development, it is widely used in fields such as civil engineering, railways, highways, water conservancy, and the nuclear industry. Currently, the coring devices widely used in engineering surveying include core barrels, thin-walled soil samplers, thick-walled soil samplers, single-action double-tube, and double-action triple-tube. Drilling and coring is a crucial step in engineering surveying. 80% of geotechnical parameters are obtained through physical and mechanical testing of geotechnical samples. Therefore, efficiently and minimally disturbingly obtaining geotechnical samples is crucial to the accuracy of survey parameters, and ultimately the safety and cost of the entire construction project. Utility Model Content

[0003] In order to solve the above-mentioned problems, the utility model provides a single-action double-tube soil sampling device which improves the efficiency of engineering survey drilling and sampling.

[0004] To achieve the above-mentioned object, the utility model provides a single-action double-tube soil sampling device for improving the efficiency of engineering survey drilling and sampling, comprising a drill rod and a drill bit provided at one end of the drill rod;

[0005] Among them, the drill rod includes an outer tube connected to the drill bit and an inner tube fixed inside the outer tube. A mud groove is spirally provided on the inner wall of the outer tube and a mud channel connected to the mud groove is provided at the top of the outer tube. An exhaust hole connected to the inside of the inner tube is also provided on the outer tube.

[0006] Preferably, the drill bit is connected to the bottom end of the outer tube through a bearing.

[0007] Preferably, the bearing is fixed to the outer tube by a bayonet pin.

[0008] Preferably, the inner wall of the outer tube and the outer wall of the inner tube are spaced apart, with a gap of 1-1.5 cm.

[0009] Preferably, the drill bit is provided with mud fan blades, and the mud fan blades are located at the interval between the inner wall of the outer tube and the outer wall of the inner tube.

[0010] Preferably, the inner tube comprises two half tubes of the same shape, and a double half-slot is provided at the connecting portion of the half tubes.

[0011] Preferably, a plurality of retaining springs are provided on the outer wall of the inner tube.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model adds a mud channel on the inner wall of the outer tube, and the outer wall and the drill bit are connected by a bearing. The drill bit rotates at high speed to cut the formation under the impact of the mud accelerated by the mud channel, forming an annular gap. The rock and soil samples retained in the annular space enter the inner tube, which protects the rock and soil samples in the most original state and improves the quality of coring. The drill rod does not rotate during drilling operation, and the rock and soil samples are obtained when the drilling depth reaches the coring length of the single-action double-tube drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the overall structure of the utility model;

[0015] Figure 2 This is a cross-sectional view of the inner and outer tubes of the utility model;

[0016] Figure 3 yes Figure 1 Sectional view at II;

[0017] Figure 4 yes Figure 1 Sectional view at II-II;

[0018] Figure 5 yes Figure 1 Sectional view at III-III;

[0019] Figure 6 yes Figure 1 Cross-sectional view at IV-IV. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] The following is combined with Figure 1-6 The utility model is further described in detail:

[0024] Reference Figure 1 The utility model provides a single-action double-tube soil sampling device for improving the efficiency of engineering exploration drilling and sampling, comprising a drill rod and a drill bit 10 provided at one end of the drill rod;

[0025] Reference Figure 2 The drill pipe includes an outer tube 1 connected to the drill bit 10 and an inner tube 2 fixed inside the outer tube 1. A mud groove 5 is spirally provided on the inner wall of the outer tube 1 and a mud channel 4 connected to the mud groove 5 is provided at the top of the outer tube 1. An exhaust hole 3 connected to the inside of the inner tube 2 is also provided on the outer tube 1.

[0026] Specifically, the inner wall of the outer tube 1 and the outer wall of the inner tube 2 are spaced apart, with a gap of 1-1.5 cm, preferably 1.5 cm; the height of the spiral thread of the mud groove 5 is 1-1.2 cm, preferably 1.2 cm.

[0027] Reference Figure 3 The top of the outer tube 1 is provided with a mud channel 4 and an exhaust hole 3, the top of the inner tube 2 is fixedly connected to the top of the inner tube 1, and the exhaust hole 3 is communicated with the inside of the inner tube 2.

[0028] Reference Figure 4-5 The inner tube 2 includes two half-tubes of the same shape, and a double half-slot 11 is provided at the connecting portion of the half-tubes. The double half-slot 11 is a conventional structure of the connecting structure.

[0029] Specifically, in order to ensure a fixed connection between the two semicircles, a plurality of retaining springs 6 are provided on the outer wall of the inner tube 2 .

[0030] The drill bit 10 is connected to the bottom end of the outer tube 1 through the bearing 8.

[0031] Reference Figure 6 The bearing 8 is fixed to the outer tube 1 by a bayonet 7. A mud fan 9 is provided on the drill bit 10, and the mud fan 9 is located at the interval between the inner wall of the outer tube 1 and the outer wall of the inner tube 2.

[0032] In this embodiment, during the engineering survey, the gap between the outer tube 1 and the inner tube 2 of the original single-action double-tube drill bit is expanded to 1.5 cm, and a spiral mud channel 4 is added to the inner wall of the outer tube 1. The outer wall and the drill bit 10 are connected by a bearing 8. The drill bit 10 rotates at high speed to cut the formation under the impact of the mud accelerated by the spiral channel, forming an annular gap. The rotation speed can reach 200-400 rpm. The ordinary drilling speed is 60-100 rpm. The rock and soil sample retained in the annular space enters the inner tube 2, which is the most original protection of the rock and soil sample and improves the quality of the coring. The drill rod does not rotate during the drilling operation. The rock and soil sample is obtained when the drilling depth reaches the coring length of the single-action double-tube drill bit. After the application of this device, the speed and quality of engineering survey drilling sampling can be improved. While reducing the cost of engineering survey, the closer the rock and soil samples taken are to the original state of the stratum, the more truly the geotechnical test data can reflect the physical and mechanical properties of the original stratum. Geotechnical test data is the fundamental basis of engineering design. Therefore, through the application of this utility model invention in the efficient and less disturbing collection of rock and soil samples, the cost of engineering survey can be reduced, the redundancy of engineering design can be reduced, thereby greatly reducing the cost of engineering construction, improving the safety performance of the project, and being beneficial to protecting the lives and property of the people and public facilities.

[0033] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A single-action double-tube soil sampling device for improving the efficiency of engineering exploration drilling sampling, characterized in that: It comprises a drill rod and a drill bit provided at one end of the drill rod; Among them, the drill rod includes an outer tube connected to the drill bit and an inner tube fixed inside the outer tube. A mud groove is spirally provided on the inner wall of the outer tube and a mud channel connected to the mud groove is provided at the top of the outer tube. An exhaust hole connected to the inside of the inner tube is also provided on the outer tube.

2. The single-action double-tube soil sampling device for improving the efficiency of engineering exploration drilling sampling according to claim 1 is characterized in that: The drill bit is connected to the bottom end of the outer tube through a bearing.

3. The single-action double-tube soil sampling device for improving the efficiency of engineering exploration drilling and sampling according to claim 2, characterized in that: The bearing is fixed to the outer tube via a bayonet pin.

4. The single-action double-tube soil sampling device for improving the efficiency of engineering exploration drilling sampling according to claim 1 is characterized in that: The inner wall of the outer tube and the outer wall of the inner tube are spaced apart, with a gap of 1-1.5 cm.

5. The single-action double-tube soil sampling device for improving the efficiency of engineering exploration drilling and sampling according to claim 1 is characterized in that: The drill bit is provided with mud fan blades, and the mud fan blades are located at the interval between the inner wall of the outer tube and the outer wall of the inner tube.

6. The single-action double-tube soil sampling device for improving the efficiency of engineering exploration drilling and sampling according to claim 5, characterized in that: The inner tube comprises two half tubes of the same shape, and a double half-slot is provided at the connecting portion of the half tubes.

7. The single-action double-tube soil sampling device for improving the efficiency of engineering exploration drilling and sampling according to claim 6, characterized in that: A plurality of clips are provided on the outer wall of the inner tube.

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