Drilling equipment for geotechnical engineering investigation and operation method thereof

Abstract

The invention discloses drilling equipment for geotechnical engineering investigation and an operation method of the drilling equipment, and relates to the technical field of geotechnical engineering. The device comprises a support, the top of the support is fixedly connected with a first driving part, an output shaft of the first driving part is fixedly connected with a threaded rod, the outer wall of the threaded rod is in threaded connection with a threaded sleeve plate, the side face of the threaded sleeve plate is slidably connected to the inner wall of the support, and the top of the threaded sleeve plate is fixedly connected with a second driving part. Through cooperation of a moving ring, a connecting ring, an L-shaped plate, a fixing block, an elastic telescopic rod, a fixing ring, an elastic telescopic disc, a connecting plate, a reverse pressing plate, a long groove and a clamping rod, the elastic telescopic disc can push the connecting plate to move in the direction away from a drilling column through the elasticity of the elastic telescopic disc; and the movement of the connecting plate can drive the reverse pressing plate to abut against the expanded shale stratum, and therefore the problem that due to expansion of the shale stratum, the hole diameter becomes small, and drilling equipment gets stuck is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical engineering, and specifically to a drilling device for geotechnical engineering investigation and its operation method. Background Technique

[0002] The drilling device for geotechnical engineering investigation is mainly used to obtain the physical properties and engineering characteristics of underground soil and rock, which can help collect soil samples and rock samples, measure the groundwater level, evaluate the bearing capacity of the foundation, and provide important data support for engineering design.

[0003] Chinese Patent with Patent Publication No. CN220791132U discloses a drilling device for geotechnical engineering investigation, including a base. Four columns are fixedly installed on the top surface of the base. Installation plates are arranged on one side of the four columns close to each other. A driving member I is fixedly installed on the top surface of the installation plate. A connecting shaft is fixedly installed at the driving end of the driving member I. When the driving member I drives the connecting shaft and the drill pipe body to rotate, the sealing connection ring will not rotate with the connecting shaft and the drill pipe body. At this time, the operator connects the liquid inlet pipe to an external liquid supply pump, so that external water enters the inside of the sealing connection ring through the liquid inlet pipe and enters the inside of the central hole through the gaps between multiple connecting and fixing blocks, thereby facilitating the cooling of the drill pipe body during the drilling process. When there is too much water inside the central hole, it will overflow through the water outlet holes to cool the outer surface of the drill pipe body, improving the cooling efficiency of the drill pipe body.

[0004] However, the current drilling device has the following problems: When drilling in a shale formation, the shale formation will expand after encountering water, and the expansion of the shale formation will cause the hole diameter to become smaller, resulting in the jamming of the drilling device. Therefore, we propose a drilling device for geotechnical engineering investigation and its operation method. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a drilling device for geotechnical engineering investigation and its operation method, which solves the problems raised in the above background technique.

[0006] To achieve the above object, the present invention is realized by the following technical solutions: A drilling device for geotechnical engineering investigation, including a bracket. A driving member one is fixedly connected to the top of the bracket. The output shaft of the driving member one is fixedly connected with a threaded rod. A threaded sleeve plate is threadedly connected to the outer wall of the threaded rod. The side surface of the threaded sleeve plate is slidably connected to the inner wall of the bracket. A driving member two is fixedly connected to the top of the threaded sleeve plate. The output shaft of the driving member two is fixedly connected with a drilling column. A control panel for driving the driving member one and the driving member two is arranged on the side surface of the bracket. An anti-pressure device is arranged on the outer wall of the drilling column. The anti-pressure device includes a moving ring. The inner wall of the moving ring is slidably connected to the outer wall of the drilling column. The bottom of the moving ring is rotatably connected with a connecting ring. A plurality of L-shaped plates are fixedly connected to the bottom of the connecting ring. Fixed blocks are fixedly connected to the side surfaces of the inner walls of the plurality of L-shaped plates. An elastic telescopic rod is fixedly connected to the bottom of the fixed block. A fixed ring is fixedly connected to the bottom of the elastic telescopic rod. The inner wall of the fixed ring is rotatably connected to the outer wall of the drilling column. An elastic telescopic disc is fixedly connected to the side surface of the inner wall of the L-shaped plate. The telescopic end of the elastic telescopic disc is fixedly connected with a connecting plate. A counter-pressure plate is fixedly connected to the side surface of the connecting plate. A clamping rod is fixedly connected to the top of the fixed ring. The top of the clamping rod penetrates and slides between the fixed end and the telescopic end of the elastic telescopic disc.

[0007] When the bracket moves to a fixed position, then start the driving member one through the control panel. The output shaft of the driving member one rotates the threaded rod. The rotation of the threaded rod makes the threaded sleeve plate move downward along the inner wall of the bracket. The downward movement of the threaded sleeve plate drives the driving member two and the drilling column to move downward. At the same time, start the driving member two through the control panel. The driving member two makes the drilling column rotate, so that the drilling column drills the shale formation. The downward movement of the drilling column drives the moving ring to move downward. The downward movement of the moving ring drives the connecting ring to move downward. The downward movement of the connecting ring drives the L-shaped plates to move downward. During the movement of the L-shaped plates, the upper part of the inner wall of the L-shaped plates will contact the ground, so that the L-shaped plates stop moving. The stop movement of the L-shaped plates will drive the fixed blocks to stop moving. Due to the continuous movement of the drilling column, the drilling column will drive the fixed ring to move. The movement of the fixed ring will stretch the elastic telescopic rod. At the same time, the movement of the fixed ring will drive the clamping rod away from the elastic telescopic disc. Therefore, the clamping rod will no longer limit the elastic telescopic disc. The elastic telescopic disc will push the connecting plate to move away from the drilling column through its own elastic force.

[0008] According to the above technical solution, the anti-pressure device further includes a conical block. The top of the conical block is fixedly connected to the top of the inner wall of the L-shaped plate. The long groove on the outer wall of the counter-pressure plate can make the contact pressure between the counter-pressure plate and the shale formation more uniform.

[0009] According to the above technical solution, a number of long slots are provided on one side of the anti-pressure plate away from the connecting plate. When the upper part of the inner wall of the L-shaped plate touches the ground, the L-shaped plate will drive the conical block to insert into the soil.

[0010] According to the above technical solution, a pushing device is provided at the top of the L-shaped plate. The pushing device includes a placement plate. The bottom of the placement plate is fixedly connected to the top of the L-shaped plate. The side of the placement plate is slidably connected to an L-shaped sliding plate. The bottom of the L-shaped sliding plate is fixedly connected to an L-shaped block. The side of the L-shaped block is rotatably connected to a rotating ring. The inner wall of the rotating ring is rotatably connected to a long column. The top of the long column is fixedly connected to a limiting disc. A spring is provided between the limiting disc and the L-shaped sliding plate. The outer wall of the rotating ring is fixedly connected to an elastic telescopic block. The bottom of the telescopic end of the elastic telescopic block is fixedly connected to an L-shaped pushing plate. The bottom of the long column is fixedly connected to a resisting ring. The bottom of the resisting ring is fixedly connected to a conical head. An arc-shaped track groove is provided on the outer wall of the long column. The inner wall of the limiting disc is fixedly connected to a slider for sliding on the inner wall of the arc-shaped track groove. The L-shaped pushing plate is in contact with the anti-pressure plate. A notch for the movement of the L-shaped sliding plate is provided at the bottom of the threaded sleeve plate.

[0011] Before the L-shaped plate touches the ground, the conical head first touches the ground. Then when the L-shaped plate moves downward, it will cause the conical head to push the long column upward through the resisting ring. The upward movement of the long column will cause the slider on the inner wall of the rotating ring to move along the arc-shaped track groove, so that the rotating ring rotates by ninety degrees. The ninety-degree rotation of the rotating ring will drive the elastic telescopic block to rotate by ninety degrees. The rotation of the elastic telescopic block will cause the L-shaped pushing plate to rotate. The rotation of the L-shaped pushing plate will push away the soil accumulated below the L-shaped plate on the ground.

[0012] According to the above technical solution, the pushing device further includes a number of L-shaped dividing knives. The outer walls of the number of L-shaped dividing knives are fixedly connected to the inner wall of the L-shaped pushing plate. When the L-shaped pushing plate moves, it will drive the L-shaped dividing knives to move.

[0013] An operation method of a drilling device for geotechnical engineering investigation includes the following steps;

[0014] S1. When the bracket moves to a fixed position;

[0015] S2. Then start the driving part one through the control panel. The output shaft of the driving part one rotates the threaded rod. The rotation of the threaded rod makes the threaded sleeve plate move downward along the inner wall of the bracket;

[0016] S3. The downward movement of the threaded sleeve plate drives the driving part two and the drilling column to move downward;

[0017] S4. At the same time, start the driving part two through the control panel;

[0018] S5. The second driving member rotates the drilling column, so that the drilling column drills the shale formation.

[0019] The present invention provides a drilling device for geotechnical engineering survey and an operating method thereof, which has the following beneficial effects:

[0020] (1) The present invention cooperates with a movable ring, a connecting ring, an L-shaped plate, a fixed block, an elastic telescopic rod, a fixed ring, an elastic telescopic disk, a connecting plate, a back pressure plate, a long groove, and a clamping rod, so that the elastic telescopic disk can push the connecting plate to move away from the drilling column through its own elastic force. The movement of the connecting plate will drive the back pressure plate to resist the expanding shale formation, thereby avoiding the problem of the shale formation expanding and causing the hole diameter to become smaller, thereby causing the drilling equipment to get stuck.

[0021] (2) The present invention cooperates with the back pressure plate and the long grooves so that the long grooves on the outer wall of the back pressure plate can make the contact pressure between the back pressure plate and the mudstone formation more uniform, thereby avoiding the situation where the local pressure is too large; at the same time, through the cooperation of the conical block and the L-shaped plate, when the upper part of the inner wall of the L-shaped plate contacts the ground, the L-shaped plate will drive the conical block to be inserted into the soil, thereby improving the stability of the drilling column in the expanding mudstone formation.

[0022] (3) The present invention cooperates with the L-shaped slide plate, L-shaped block, swivel, long column, arc-shaped track groove, resistance ring, conical head, limit disc, elastic telescopic block, L-shaped push plate and spring so that the rotation of the L-shaped push plate will push away the soil accumulated on the ground below the L-shaped plate, thereby avoiding the problem that the L-shaped push plate will expand the back pressure plate in advance due to the force of the accumulated soil, thereby causing the back pressure plate to be difficult to conflict with the expanded mud shale; at the same time, through the cooperation of the L-shaped dividing knife and the L-shaped push plate, the L-shaped push plate will drive the L-shaped dividing knife to move when it moves, and the movement of the L-shaped dividing knife will disperse the soil accumulated on the ground, thereby increasing the pushing speed and avoiding the problem that the soil is difficult to push due to moisture. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the present invention as a whole;

[0024] Figure 2 This is a structural schematic diagram of the threaded sleeve plate of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the drilling column of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the fixing ring of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the L-shaped plate of the present invention;

[0028] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at position A in the present invention;

[0029] Figure 7 For the present invention Figure 5 Schematic diagram of the structure at position B in the present invention;

[0030] Figure 8 Schematic diagram of the structure at the placement plate of the present invention;

[0031] Figure 9 Schematic diagram of the structure at the pushing device of the present invention.

[0032] In the figure: 1. Bracket; 2. Control panel; 3. First driving member; 4. Threaded rod; 5. Threaded sleeve plate; 6. Second driving member; 7. Drilling column; 8. Back pressure device; 81. Moving ring; 82. Connecting ring; 83. L-shaped plate; 84. Fixed block; 85. Elastic telescopic rod; 86. Fixed ring; 87. Elastic telescopic disc; 88. Connecting plate; 89. Back pressure plate; 810. Long groove; 811. Clamping rod; 812. Tapered block; 9. Pushing device; 91. Placement plate; 92. L-shaped sliding plate; 93. L-shaped block; 94. Swivel ring; 95. Long column; 96. Arc-shaped track groove; 97. Contact ring; 98. Tapered head; 99. Limit disc; 910. Elastic telescopic block; 911. L-shaped pushing plate; 912. Spring; 913. L-shaped dividing knife. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] Please refer to Figure 1 - Figure 9, an embodiment of the present invention is: a drilling device for geotechnical engineering investigation, including a bracket 1. A driving member 3 is fixedly connected to the top of the bracket 1. The output shaft of the driving member 3 is fixedly connected to a threaded rod 4. A threaded sleeve plate 5 is threadedly connected to the outer wall of the threaded rod 4. The side of the threaded sleeve plate 5 is slidably connected to the inner wall of the bracket 1. A driving member 6 is fixedly connected to the top of the threaded sleeve plate 5. The output shaft of the driving member 6 is fixedly connected to a drilling column 7. A control panel 2 for driving the driving member 3 and the driving member 6 is arranged on the side of the bracket 1. An anti-pressure device 8 is arranged on the outer wall of the drilling column 7. The anti-pressure device 8 includes a moving ring 81. The inner wall of the moving ring 81 is slidably connected to the outer wall of the drilling column 7. The bottom of the moving ring 81 is rotatably connected to a connecting ring 82. A plurality of L-shaped plates 83 are fixedly connected to the bottom of the connecting ring 82. Fixed blocks 84 are fixedly connected to the inner side surfaces of the plurality of L-shaped plates 83. An elastic telescopic rod 85 is fixedly connected to the bottom of the fixed block 84. The bottom of the elastic telescopic rod 85 is fixedly connected to a fixed ring 86. The inner wall of the fixed ring 86 is rotatably connected to the outer wall of the drilling column 7. An elastic telescopic disc 87 is fixedly connected to the inner side surface of the L-shaped plate 83. A connecting plate 88 is fixedly connected to the telescopic end of the elastic telescopic disc 87. An anti-pressure plate 89 is fixedly connected to the side of the connecting plate 88. A clamping rod 811 is fixedly connected to the top of the fixed ring 86. The top of the clamping rod 811 penetrates and slides between the fixed end and the telescopic end of the elastic telescopic disc 87. Through the setting of the above structure, the movement of the connecting plate 88 will drive the anti-pressure plate 89 to resist the expanding shale formation, thereby avoiding the problem that the expansion of the shale formation causes the pore diameter to become smaller and the drilling device to get stuck.

[0035] The anti-pressure device 8 further includes a conical block 812. The top of the conical block 812 is fixedly connected to the inner top of the L-shaped plate 83. Through the setting of the above structure, the long groove on the outer wall of the anti-pressure plate 89 can make the contact pressure between the anti-pressure plate 89 and the shale formation more uniform, avoiding the situation of excessive local pressure.

[0036] A plurality of long grooves 810 are formed on the side of the anti-pressure plate 89 away from the connecting plate 88. Through the setting of the above structure, the L-shaped plate 83 will drive the conical block 812 to insert into the soil, thereby improving the stability of the drilling column 7 in the expanding shale formation.

[0037] In use, when the support 1 moves to a fixed position, the first driving member 3 is then started through the control panel 2. The output shaft of the first driving member 3 rotates the threaded rod 4. The rotation of the threaded rod 4 causes the threaded sleeve plate 5 to move downward along the inner wall of the support 1. The downward movement of the threaded sleeve plate 5 drives the second driving member 6 and the drilling column 7 to move downward. At the same time, the second driving member 6 is started through the control panel 2, and the second driving member 6 rotates the drilling column 7, so that the drilling column 7 drills the shale formation. The downward movement of the drilling column 7 drives the moving ring 81 to move downward. The downward movement of the moving ring 81 drives the connecting ring 82 to move downward. The downward movement of the connecting ring 82 drives the L-shaped plate 83 to move downward. During the movement of the L-shaped plate 83, the upper part of the inner wall of the L-shaped plate 83 will contact the ground, so that the L-shaped plate 83 stops moving. The stop movement of the L-shaped plate 83 will drive the fixed block 84 to stop moving. Due to the continuous movement of the drilling column 7, the drilling column 7 will drive the fixed ring 86 to move. The movement of the fixed ring 86 will stretch the elastic telescopic rod 85. At the same time, the movement of the fixed ring 86 will drive the clamping rod 811 away from the elastic telescopic disc 87. Therefore, the clamping rod 811 will no longer restrict the elastic telescopic disc 87. The elastic telescopic disc 87 will push the connecting plate 88 to move away from the drilling column 7 through its own elastic force. The movement of the connecting plate 88 will drive the anti-pressure plate 89 to resist the expanded shale formation, so as to avoid the problem that the expansion of the shale formation causes the hole diameter to become smaller and the drilling equipment gets stuck; the long groove on the outer wall of the anti-pressure plate 89 can make the contact pressure between the anti-pressure plate 89 and the shale formation more uniform and avoid the situation of excessive local pressure; when the upper part of the inner wall of the L-shaped plate 83 contacts the ground, the L-shaped plate 83 will drive the conical block 812 to insert into the soil, so as to improve the stability of the drilling column 7 in the expanded shale formation.

[0038] Please refer to Figure 1 - Figure 9On the basis of the above embodiment, in another embodiment of the present invention, a pushing device 9 is provided on the top of the L-shaped plate 83, and the pushing device 9 includes a placing plate 91, the bottom of the placing plate 91 is fixedly connected to the top of the L-shaped plate 83, the side of the placing plate 91 is slidably connected to an L-shaped slide plate 92, the bottom of the L-shaped slide plate 92 is fixedly connected to an L-shaped block 93, the side of the L-shaped block 93 is rotatably connected to a swivel 94, the inner wall of the swivel 94 is rotatably connected to a long column 95, the top of the long column 95 is fixedly connected to a limiting disk 99, a spring 912 is provided between the limiting disk 99 and the L-shaped slide plate 92, the outer wall of the swivel 94 is fixedly connected to an elastic telescopic block 910, and the bottom of the telescopic end of the elastic telescopic block 910 is fixedly connected to an L-shaped The push plate 911 and the bottom of the long column 95 are fixedly connected with a resistance ring 97, and the bottom of the resistance ring 97 is fixedly connected with a conical head 98. The outer wall of the long column 95 is provided with an arc-shaped track groove 96, and the inner wall of the limiting disc 99 is fixedly connected with a slider for sliding on the inner wall of the arc-shaped track groove 96. The L-shaped push plate 911 is in contact with the back pressure plate 89, and the bottom of the threaded sleeve plate 5 is provided with a groove for the movement of the L-shaped slide plate 92. Through the arrangement of the above structure, the rotation of the L-shaped push plate 911 will push away the soil accumulated on the ground below the L-shaped plate 83, and avoid the L-shaped push plate 911 from being subjected to the force of the accumulated soil and causing the back pressure plate 89 to be deployed in advance, thereby causing the back pressure plate 89 to be difficult to conflict with the expanding mudstone.

[0039] The pushing device 9 also includes a plurality of L-shaped dividing knives 913, and the outer walls of the plurality of L-shaped dividing knives 913 are fixedly connected to the inner wall of the L-shaped pushing plate 911. Through the arrangement of the above-mentioned structure, the movement of the L-shaped dividing knives 913 will disperse the soil accumulated on the ground, thereby increasing the pushing speed and avoiding the problem of the soil being difficult to push due to moisture.

[0040] When in use, before the L-shaped plate 83 contacts the ground, the conical head 98 first contacts the ground. Then, when the L-shaped plate 83 moves downward, the conical head 98 pushes the long column 95 upward through the contact ring 97. The upward movement of the long column 95 causes the slider on the inner wall of the swivel 94 to move along the arc track groove 96, so that the swivel 94 rotates 90 degrees. The 90-degree rotation of the swivel 94 drives the elastic telescopic block 910 to rotate 90 degrees. The rotation of the elastic telescopic block 910 causes the L-shaped push plate 911 to rotate The rotation of the L-shaped push plate 911 will push away the soil accumulated on the ground below the L-shaped plate 83, and avoid the problem that the L-shaped push plate 911 will expand the back pressure plate 89 in advance due to the force of the accumulated soil, thereby causing the back pressure plate 89 to be difficult to conflict with the expanded mudstone; the L-shaped push plate 911 will drive the L-shaped dividing knife 913 to move when moving, and the movement of the L-shaped dividing knife 913 will disperse the accumulated soil on the ground, thereby increasing the pushing speed and avoiding the problem that the soil is difficult to push due to moisture.

[0041] In addition, the present invention also provides an operation method for a drilling device used in geotechnical engineering investigation, including the following steps;

[0042] S1. Move the support 1 to a fixed position and perform positioning;

[0043] S2. Subsequently, start the first driving member 3 through the control panel 2. The output shaft of the first driving member 3 rotates the threaded rod 4, and the rotation of the threaded rod 4 causes the threaded sleeve plate 5 to move downward along the inner wall of the support 1;

[0044] S3. The downward movement of the threaded sleeve plate 5 drives the second driving member 6 and the drilling column 7 to move downward;

[0045] S4. At the same time, start the second driving member 6 through the control panel 2;

[0046] S5. The second driving member 6 rotates the drilling column 7, so that the drilling column 7 drills the shale formation.

[0047] As described above, only the preferred specific implementation manners of the present invention are provided, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. A drilling device for geotechnical engineering investigation, comprising a support. A first driving member is fixedly connected to the top of the support. The output shaft of the first driving member is fixedly connected to a threaded rod. A threaded sleeve plate is threadedly connected to the outer wall of the threaded rod. The side surface of the threaded sleeve plate is slidably connected to the inner wall of the support. A second driving member is fixedly connected to the top of the threaded sleeve plate. The output shaft of the second driving member is fixedly connected to a drilling column. A control panel for driving the first driving member and the second driving member is arranged on the side surface of the support. It is characterized in that: The outer wall of the drill string is provided with a backpressure device. The backpressure device includes a moving ring. The inner wall of the moving ring is slidably connected to the outer wall of the drill string. The bottom of the moving ring is rotatably connected to a connecting ring. The bottom of the connecting ring is fixedly connected with a plurality of L-shaped plates. The inner side surfaces of the plurality of L-shaped plates are fixedly connected with fixing blocks. The bottom of the fixing block is fixedly connected with an elastic telescopic rod. The bottom of the elastic telescopic rod is fixedly connected with a fixing ring. The inner wall of the fixing ring is rotatably connected to the outer wall of the drill string. The inner side surface of the L-shaped plate is fixedly connected with an elastic telescopic disc. The telescopic end of the elastic telescopic disc is fixedly connected with a connecting plate. The side surface of the connecting plate is fixedly connected with a backpressure plate. The top of the fixing ring is fixedly connected with a clamping rod. The top of the clamping rod penetrates and slides between the fixed end and the telescopic end of the elastic telescopic disc.

2. The drilling equipment for geotechnical engineering investigation according to claim 1, characterized in that: The backpressure device further includes a conical block. The top of the conical block is fixedly connected to the inner top of the L-shaped plate.

3. The drilling equipment for geotechnical engineering investigation according to claim 1, characterized in that: A plurality of long grooves are formed on the side of the backpressure plate away from the connecting plate.

4. The drilling equipment for geotechnical engineering investigation according to claim 1, characterized in that: A pushing device is arranged on the top of the L-shaped plate. The pushing device includes a placing plate. The bottom of the placing plate is fixedly connected to the top of the L-shaped plate. The side surface of the placing plate is slidably connected to an L-shaped sliding plate. The bottom of the L-shaped sliding plate is fixedly connected with an L-shaped block. The side surface of the L-shaped block is rotatably connected to a rotating ring. The inner wall of the rotating ring is rotatably connected to a long column. The top of the long column is fixedly connected with a limiting disc. A spring is arranged between the limiting disc and the L-shaped sliding plate. The outer wall of the rotating ring is fixedly connected with an elastic telescopic block. The bottom of the telescopic end of the elastic telescopic block is fixedly connected with an L-shaped pushing plate.

5. The drilling equipment for geotechnical engineering investigation according to claim 4, characterized in that: The pushing device further includes a plurality of L-shaped separating knives. The outer walls of the plurality of L-shaped separating knives are fixedly connected to the inner wall of the L-shaped pushing plate.

6. The drilling equipment for geotechnical engineering investigation according to claim 4, characterized in that: The bottom of the long column is fixedly connected with a resisting ring. The bottom of the resisting ring is fixedly connected with a conical head.

7. The drilling equipment for geotechnical engineering investigation according to claim 4, characterized in that: An arc-shaped track groove is formed on the outer wall of the long column. The inner wall of the limiting disc is fixedly connected with a slider for sliding on the inner wall of the arc-shaped track groove.

8. The drilling equipment for geotechnical investigation according to claim 4, characterized in that: The L-shaped pushing plate is in contact with the backpressure plate. A notch for the movement of the L-shaped sliding plate is formed at the bottom of the threaded sleeve plate.

9. The operating method of the drilling equipment for geotechnical engineering investigation according to any one of claims 1-8, characterized in that: Including the following steps; S1. Move the support to a fixed position and position it. S2. Then start the driving part one through the control panel. The output shaft of the driving part one rotates the threaded rod. The rotation of the threaded rod makes the threaded sleeve plate move downward along the inner wall of the support. S3. The downward movement of the threaded sleeve plate drives the driving part two and the drill string to move downward. S4. At the same time, start the driving part two through the control panel. S5. The driving part two rotates the drill string, so that the drill string drills the shale formation.

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