A drilling device for geotechnical engineering investigation

Abstract

The application belongs to the technical field of geotechnical engineering investigation, and discloses a drilling device for geotechnical engineering investigation, which comprises a drilling mechanism, wherein the inside of the drilling mechanism is provided with a connecting mechanism; the drilling mechanism is composed of a mounting frame, a rack, a through opening, a ball screw and a drilling assembly; the top of the mounting frame is provided with the rack; and the lower end of the rack is provided with the through opening. The application is characterized in that the movement of the upper connecting frame and the lower connecting frame is unsynchronized, the upper connecting frame normally moves downward under the action of the ball screw, the lower connecting frame is gradually pressed against the drilling assembly by the rebounding pressure from the shock-absorbing spring and the return spring, the drilling assembly automatically moves downward when drilling hard stone blocks, the rigid vertical pressure from the ball screw does not directly act on the drilling assembly, the synchronous buffering between the upper connecting frame and the lower connecting frame is performed, and the rigid rebounding force damage suffered by the drilling assembly is reduced.

Description

Technical Field

[0001] This invention belongs to the field of geotechnical engineering exploration technology, specifically a drilling device for geotechnical engineering exploration. Background Technology

[0002] High-rise building construction has certain geological requirements, necessitating specialized geotechnical engineering investigations. A common method is drilling. Drilling equipment, powered by both linear and rotary forces, drives a drill rod deep into the soil to obtain information about the soil conditions. In existing technologies, ball screws and motors are used to vertically transport the drilling module downwards, while the motor drives the drill rod to rotate. When encountering hard rocks in the soil, rigid rebound damage occurs to the drill rod end and the entire power module and drilling module. In existing technologies, the vertical movement of the drilling module is automatic under the action of ball screws (or hydraulic rods), and the connection between the power module and drilling module is generally a rigid connection, primarily welded. Therefore, when encountering hard rocks, the drill rod and the entire drilling module suffer irreversible rigid collision damage due to insufficient buffering. Therefore, the inventors have dedicated themselves to designing a buffered connection component to address these shortcomings. Summary of the Invention

[0003] The purpose of this invention is to provide a drilling device for geotechnical engineering exploration to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a drilling device for geotechnical engineering investigation, comprising a drilling mechanism, wherein a connecting mechanism is provided inside the drilling mechanism;

[0005] The drilling mechanism consists of a mounting frame, a frame, a through port, a ball screw, and drilling components. The frame is mounted on the top of the mounting frame, and the through port is opened at the lower end of the frame. A ball screw is mounted on the top of the frame, and a connecting mechanism is slidably mounted on the outer surface of the ball screw.

[0006] The connecting mechanism mainly includes an upper connecting frame and a lower connecting frame. The upper connecting frame is slidably mounted on the outer surface of the ball screw, and the lower connecting frame is snapped onto the bottom of the inner wall of the upper connecting frame. Two sets of connecting plates are movably hinged to the top of the inner wall of the upper connecting frame via mounting columns. A buffer pad is glued to the bottom of the connecting plate. An adapter block is installed on the inner side of the connecting plate. A telescopic component is movably connected to the outer side of the connecting plate. A second receiving column is also fixedly installed on the top of the inner wall of the lower connecting frame. A shock-absorbing spring and a second telescopic column are movably sleeved inside the second receiving column. A limit plate is fixedly connected to the bottom end of the second telescopic column. Both ends of the limit plate are in contact with the inner side of the adapter block. A damping component is also provided between the upper and lower connecting frames.

[0007] Preferably, the telescopic assembly consists of a receiving column, a return spring, and a telescopic column. The top end of the receiving column is movably hinged to the top of the inner wall of the upper connecting frame. The return spring and the telescopic column are movably sleeved inside the receiving column. The telescopic column is elastically supported inside the receiving column by the return spring. The other end of the telescopic column is movably hinged to the outer side of the connecting plate. There are two telescopic assemblies, and the two telescopic assemblies are symmetrically distributed on the outer sides of the two sets of connecting plates.

[0008] Preferably, the damping assembly consists of two damping rods that are centrally symmetrically distributed. The damping rods are inclined and movably hinged between the top of the inner wall of the upper connecting frame and the limiting plate, and the central axis of symmetry of the two damping rods is the center line of the upper connecting frame.

[0009] Preferably, the cushioning pad is made of rubber block, and the bottom of the cushioning pad is in compression contact with the top of the lower connecting frame.

[0010] Preferably, the two sets of connecting plates are symmetrically distributed on both sides of the limiting plate. The inner side of the connecting plate is provided with a slot. The adapter block is provided with a triangular protrusion on the side facing the connecting plate. The triangular protrusion is adapted to fit into the slot. The adapter block and the connecting plate are fixed by welding.

[0011] Preferably, the bottom of the adapter block facing the telescopic column has an inclined surface, and the top of both sides of the limiting plate has a semi-circular protrusion, which is in contact with the inclined surface.

[0012] Preferably, when the connecting plates are vertically distributed between the upper connecting frame and the lower connecting frame, the upper surface of the bottom of the upper connecting frame and the lower surface of the bottom of the lower connecting frame are in a state of compression contact.

[0013] Preferably, the drilling assembly is fixedly installed at the bottom of the lower connecting frame, and the drilling assembly consists of a mounting plate, a motor and a drill rod, with the axis of the drilling assembly being collinear with the axis of the through port.

[0014] Preferably, the upper and lower ends of the shock-absorbing spring are elastically connected to the second receiving column and the second telescopic column in sequence. The second telescopic column is adapted to be inserted into the inside of the second receiving column, and the second telescopic column is elastically supported inside the second receiving column by the shock-absorbing spring. The shock-absorbing spring is compressed and disposed inside the second receiving column.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. This invention incorporates a connecting mechanism primarily designed to reduce rigid rebound damage to the drilling assembly when encountering hard rocks. Through an adapter block positioned on the inner side of the connecting plate, and a limiting plate mounted on the top of the lower connecting frame, the significant vibration energy generated when the drilling assembly encounters hard rocks overcomes the damping force from the shock-absorbing spring and damping rod. This forcefully pushes the limiting plate upwards, and the protrusions on both sides of the limiting plate simultaneously push the adapter block and connecting plate apart, releasing the vertical locking state of the connecting plate. This transforms the connecting mechanism from a rigid overall structure to one consisting of an upper connecting frame and a lower connecting frame. The connecting frames are movable, utilizing the compressible characteristics of the shock-absorbing springs and return springs to make the upper and lower connecting frames move asynchronously. As the upper connecting frame moves downward normally under the action of the ball screw, the lower connecting frame applies appropriate pressure to the drilling assembly through the gradually increasing rebound pressure from the shock-absorbing springs and return springs. This causes the drilling assembly to move downward automatically when drilling through hard rocks, thus preventing the rigid vertical pressure from the ball screw from directly affecting the drilling assembly. Through the synchronous buffering between the upper and lower connecting frames, the rigid rebound force damage suffered by the drilling assembly is reduced.

[0017] 2. Simultaneously, the damping rod absorbs the vibration generated by the upward vibration displacement of the shock-absorbing spring caused by the limiting plate and the lower connecting frame, effectively maintaining the connection stability between the ball screw and the drilling assembly. By adding a buffer pad at the bottom of the connecting plate, when the lower connecting frame is subjected to the rebound force transmitted upward from the drilling assembly, it drives the limiting plate to apply pressure to the telescopic column, damping rod, and adapter block. The damping rod dissipates the energy absorbed when the shock-absorbing spring and the return spring are compressed. The damping rod is divided into two groups and is set at an angle, which can effectively reduce the vibration transmitted to the connecting mechanism and improve the connection stability between the ball screw and the drilling assembly.

[0018] 3. Finally, when the connecting plate enters the reset and merging state after being opened, the compressed reset spring and shock-absorbing spring have a large elastic potential energy. After the drilling assembly passes through the hard rock, the lower connecting frame is no longer subjected to an upward rigid rebound force. At this time, the damping rod applies a damping force upward to the limiting plate and the lower connecting frame. Since the damping rod is placed at an angle, the force-saving lever it generates will multiply its own damping force, reducing the back pressure of the resetting telescopic column one and telescopic column two, and realizing the "braking function" of the connecting plate reset. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A;

[0021] Figure 3This is a partial cross-sectional view of the overall structure of the present invention from the front.

[0022] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point B;

[0023] Figure 5 This is a partial cross-sectional schematic diagram of the connecting mechanism of the present invention;

[0024] Figure 6 This is an exploded view of the overall connection mechanism of the present invention;

[0025] Figure 7 This is a partial exploded view of the connecting mechanism of the present invention;

[0026] Figure 8 This is a partial side cross-sectional view of the connecting mechanism of the present invention.

[0027] In the diagram: 1. Drilling mechanism; 10. Mounting frame; 11. Frame; 12. Through port; 13. Ball screw; 14. Drilling assembly; 2. Connecting mechanism; 20. Upper connecting frame; 21. Lower connecting frame; 22. Telescopic assembly; 220. Receiving column one; 221. Return spring; 222. Telescopic column one; 23. Mounting column; 24. Connecting plate; 25. Buffer pad; 26. Slot; 27. Adaptor block; 28. Damping rod; 29. ​​Receiving column two; 210. Shock-absorbing spring; 211. Telescopic column two; 212. Limiting plate. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figures 1 to 8 As shown, this embodiment of the invention provides a drilling device for geotechnical engineering investigation, including a drilling mechanism 1, and a connecting mechanism 2 is provided inside the drilling mechanism 1;

[0030] The drilling mechanism 1 consists of a mounting frame 10, a frame 11, a through port 12, a ball screw 13, and a drilling assembly 14. The frame 11 is mounted on the top of the mounting frame 10, and the through port 12 is opened at the lower end of the frame 11. The ball screw 13 is mounted on the top of the frame 11, and a connecting mechanism 2 is slidably mounted on the outer surface of the ball screw 13.

[0031] The connecting mechanism 2 mainly includes an upper connecting frame 20 and a lower connecting frame 21. The upper connecting frame 20 is slidably installed on the outer surface of the ball screw 13, and the lower connecting frame 21 is snapped onto the bottom of the inner wall of the upper connecting frame 20. The top of the inner wall of the upper connecting frame 20 is movably hinged to two sets of connecting plates 24 through the mounting column 23. The bottom of the connecting plate 24 is glued with a buffer pad 25. The inner side of the connecting plate 24 is installed with an adapter block 27. The outer side of the connecting plate 24 is movably connected with a telescopic component 22. The top of the inner wall of the lower connecting frame 21 is also fixedly installed with a second receiving column 29. The inside of the second receiving column 29 is movably sleeved with a shock-absorbing spring 210 and a second telescopic column 211. The bottom end of the second telescopic column 211 is fixedly connected with a limit plate 212. Both ends of the limit plate 212 are in contact with the inner side of the adapter block 27. A damping component is also provided between the upper connecting frame 20 and the lower connecting frame 21.

[0032] This device has been improved and optimized, and an improved design is proposed to add a connecting mechanism 2 between the ball screw 13 and the drilling assembly 14. This mechanism provides a buffering effect for the drilling assembly 14 during drilling, mainly reducing rigid rebound damage caused by the drilling assembly 14 encountering hard rocks. The upper connecting frame 20 and lower connecting frame 21 are engaged and installed. In their initial state, the receiving column 220 and mounting column 23 vertically engage the two sets of connecting plates 24 between the upper and lower connecting frames 20 and 21, forming a rigid overall shape for the connecting mechanism 2. This ensures that the ball screw 13 drives the drilling assembly 14 through the connecting mechanism 2 to maintain normal drilling operations. The adapter block 27 located on the inner side of the connecting plate 24, with the limiting plate 212 installed on top of the lower connecting frame 21, overcomes the large vibration energy generated when the drilling assembly 14 encounters hard rocks during drilling. This is achieved through the damping effect between the shock-absorbing spring 210 and the damping rod 28. The vibration force forcibly pushes the limiting plate 212 upward, and uses the protrusions on both sides of the limiting plate 212 to push the adapter block 27 and the connecting plate 24 to the sides simultaneously, releasing the vertical locking state of the connecting plate 24, and changing the connecting mechanism 2 from an overall rigidity to a movable connection between the upper connecting frame 20 and the lower connecting frame 21. Utilizing the compressible characteristics of the shock-absorbing spring 210 and the return spring 221, the upper connecting frame 20 and the lower connecting frame 21 move asynchronously. As the upper connecting frame 20 moves downward normally under the action of the ball screw 13, the lower connecting frame 21 applies appropriate pressure to the drilling assembly 14 through the gradually increasing rebound pressure from the shock-absorbing spring 210 and the return spring 221, thereby causing the drilling assembly 14 to move downward automatically when drilling and breaking hard rocks, thus preventing the rigid vertical pressure from the ball screw 13 from directly affecting the drilling assembly 14. Through the synchronous buffering between the upper connecting frame 20 and the lower connecting frame 21, the rigid rebound force damage suffered by the drilling assembly 14 is reduced.

[0033] When the connecting plate 24 is opened and enters the reset and merged state, the compressed reset spring 221 and shock-absorbing spring 210 have a large elastic potential energy. After the drilling assembly 14 passes through the hard rock, the lower connecting frame 21 is no longer subjected to an upward rigid rebound force. At this time, the damping rod 28 applies a damping force upward to the limiting plate 212 and the lower connecting frame 21. Since the damping rod 28 is placed at an angle, the force-saving lever it generates will multiply its own damping force, reducing the back pressure of the telescopic column 1 222 and telescopic column 211 reset, thus realizing the "braking function" of the connecting plate 24 reset.

[0034] The telescopic assembly 22 consists of a receiving column 220, a return spring 221, and a telescopic column 222. The top end of the receiving column 220 is movably hinged to the top of the inner wall of the upper connecting frame 20. The return spring 221 and the telescopic column 222 are movably sleeved inside the receiving column 220. The telescopic column 222 is elastically supported inside the receiving column 220 by the return spring 221. The other end of the telescopic column 222 is movably hinged to the outer side of the connecting plate 24. There are two telescopic assemblies 22, and the two telescopic assemblies 22 are symmetrically distributed on the outer side of the two sets of connecting plates 24.

[0035] The receiving column 220 is responsible for providing reset pressure to the connecting plate 24 when it is pushed open by both sides. As the lower connecting frame 21 drives the limiting plate 212 to push the adapter block 27 upward, the connecting plate 24 rotates to both sides, releasing the rigid locking effect between the lower connecting frame 21 and the upper connecting frame 20. This allows the lower connecting frame 21 to no longer be subjected to rigid pressure from the ball screw 13 and the connecting mechanism 2, resulting in relative movement and providing sufficient buffering effect for the drilling assembly 14.

[0036] The damping assembly consists of two centrally symmetrically distributed damping rods 28. The damping rods 28 are inclined and movably hinged between the top of the inner wall of the upper connecting frame 20 and the limiting plate 212. The central axis of symmetry of the two damping rods 28 is the center line of the upper connecting frame 20.

[0037] The damping component is used to absorb the energy generated by the shock-absorbing spring 210 and the return spring 221 when they are compressed, which is equivalent to the brake of the shock-absorbing spring 210 and the return spring 221. Its tilted design can avoid interfering with the vertical space of the lower connecting frame 21 and the limiting plate 212 when they move upward.

[0038] The damping rod 28 absorbs the vibration generated by the upward vibration displacement of the shock-absorbing spring 210 caused by the limiting plate 212 and the lower connecting frame 21, which can effectively maintain the connection stability between the ball screw 13 and the drilling assembly 14. By adding a buffer pad 25 to the bottom of the connecting plate 24, when the lower connecting frame 21 is subjected to the rebound force transmitted upward from the drilling assembly 14, it drives the limiting plate 212 to apply pressure to the telescopic column 211, the damping rod 28 and the adapter block 27. The damping rod 28 dissipates the energy absorbed when the shock-absorbing spring 210 and the return spring 221 are compressed. The damping rod 28 is divided into two groups and is set at an angle, which can effectively reduce the vibration transmitted to the connecting mechanism 2 and improve the connection stability between the ball screw 13 and the drilling assembly 14.

[0039] The buffer pad 25 is made of rubber block, and the bottom of the buffer pad 25 is in contact with the top of the lower connecting frame 21 by compression.

[0040] The buffer pad 25 is squeezed between the connecting plate 24 and the lower connecting frame 21 to reduce rigid compression damage between the connecting plate 24 and the lower connecting frame 21. At the same time, the connecting plate 24 can rotate smoothly when subjected to the lateral pressure of the limiting plate 212 without rigid compression damage between it and the lower connecting frame 21.

[0041] Two sets of connecting plates 24 are symmetrically distributed on both sides of the limiting plate 212. The inner side of the connecting plate 24 is provided with a slot 26. The adapter block 27 is provided with a triangular protrusion on the side facing the connecting plate 24. The triangular protrusion is adapted to fit into the slot 26. The adapter block 27 and the connecting plate 24 are fixed by welding.

[0042] Two sets of connecting plates 24 are arranged in an open-close configuration between the upper connecting frame 20 and the lower connecting frame 21. The open-close configuration refers to:

[0043] When combined, the connecting plate 24 can be vertically distributed and press down against the lower connecting frame 21, forming a rigid compression between the upper connecting frame 20 and the lower connecting frame 21;

[0044] The adapter block 27 on the inner side of the connecting plate 24 is provided with an inclined surface. When pushed upward by the limiting plate 212, the two sets of connecting plates 24 provide an opening to release the rigid compression on the lower connecting frame 21, so that the drilling assembly 14 will not be subjected to rigid pressure from the ball screw 13 and the connecting mechanism 2 when encountering hard rocks.

[0045] Among them, the bottom of the adapter block 27 facing the telescopic column 211 is provided with an inclined surface, and the top of the left and right sides of the limiting plate 212 is provided with a semi-circular protrusion, which is pressed and contacted with the inclined surface.

[0046] The beveled design on the side of the adapter block 27 can convert the upward pushing force of the limiting plate 212 into the pushing force on both sides of the connecting plate 24, which helps the connecting plate 24 to open.

[0047] When the connecting plate 24 is vertically distributed between the upper connecting frame 20 and the lower connecting frame 21, the upper surface of the bottom of the upper connecting frame 20 and the lower surface of the top of the lower connecting frame 21 are in a state of compression contact.

[0048] When the connecting plate 24 is vertically distributed between the upper connecting frame 20 and the lower connecting frame 21, the upper connecting frame 20 and the lower connecting frame 21 just abut against each other. At this time, the connecting mechanism 2 is rigid as a whole.

[0049] The drilling assembly 14 is fixedly installed at the bottom of the lower connecting frame 21, and the drilling assembly 14 consists of a mounting plate, a motor and a drill rod. The axis of the drilling assembly 14 is collinear with the axis of the through port 12.

[0050] The drilling assembly 14 can move downward under the action of the ball screw 13 and the connecting mechanism 2, thereby performing drilling work through the port 12.

[0051] Among them, the upper and lower ends of the shock-absorbing spring 210 are elastically connected to the second receiving column 29 and the second telescopic column 211 in sequence. The second telescopic column 211 is adapted to be inserted into the inside of the second receiving column 29, and the second telescopic column 211 is elastically supported inside the second receiving column 29 by the shock-absorbing spring 210. The shock-absorbing spring 210 is compressed and set inside the second receiving column 29.

[0052] The shock-absorbing spring 210 is compressed and disposed inside the receiving column 29. When the limiting plate 212 transmits the vibration from the drilling assembly 14, the shock-absorbing spring 210 absorbs the energy by being compressed and then dissipates it through the damping rod 28.

[0053] Working principle and usage process:

[0054] First, install the drilling mechanism 1 on the vehicle body or fixed frame, move the drilling mechanism 1 to the designated working position, and start the ball screw 13 to drive the connecting mechanism 2 to move downward as a whole. At this time, the upper connecting frame 20, the lower connecting frame 21 and the drilling assembly 14 move downward synchronously. Before the bottom end of the drilling assembly 14 passes through the through-hole 12 and drills into the ground, turn on the drilling assembly 14 and generate rotational force, and the drilling assembly 14 rotates downward into the soil layer.

[0055] Under normal circumstances, the rocks encountered during drilling are not very hard. They can be easily broken by the rotation of the drilling assembly 14 and the downward pressure from the ball screw 13. At this time, the rigid rebound force on the drilling assembly 14 and the connecting mechanism 2 as a whole is not large. The minimal upward displacement of the limiting plate 212 is absorbed by the shock-absorbing spring 210 inside the receiving column 29 and digested by the damping rod 28. At this time, the limiting plate 212 will not have a large upward displacement. The outward thrust on the two sets of connecting plates 24 is small. The connecting plates 24 are still vertically distributed between the upper connecting frame 20 and the lower connecting frame 21. The connecting mechanism 2 as a whole is rigid to the outside.

[0056] When the drilling assembly 14 encounters a hard rock, the hard contact between the drilling assembly 14 and the rock will inevitably generate a huge vibration in the vertical direction. At this time, after absorbing the vibration, the energy stored in the shock-absorbing spring 210 inside the housing column 29 cannot be digested by the damping rod 28 in time, causing the lower connecting frame 21 and the limiting plate 212 to move upward continuously. This causes the limiting plate 212 to squeeze the adapter block 27, pushing the two sets of connecting plates 24 to the sides and releasing the vertical locking state of the connecting plates 24. At this time, the lower connecting frame 21 and the upper connecting frame 20 slide relative to each other, and the force generated by both is transmitted to the telescopic assembly 22, the damping rod 28 and the shock-absorbing spring 210. During this period, the upper connecting frame 20 moves downward, but the lower connecting frame 21 does not move downward. Until the bottom of the drilling assembly 14 breaks the hard rock it encounters, the drilling assembly 14 is no longer affected by the rigid rebound force. The rebound force generated by the reset spring 221 and the shock-absorbing spring 210 will push the connecting plate 24 to reset after overcoming the resistance of the damping rod 28. The connecting plate 24 is then locked in a vertical position between the upper connecting frame 20 and the lower connecting frame 21, thereby preventing the rigid vertical pressure from the ball screw 13 from directly affecting the drilling assembly 14. Through the synchronous buffering between the upper connecting frame 20 and the lower connecting frame 21, the damage caused by the rigid rebound force to the drilling assembly 14 is reduced.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drilling device for geotechnical engineering investigation, comprising a drilling mechanism (1), characterized in that: The drilling mechanism (1) is internally equipped with a connecting mechanism (2); The drilling mechanism (1) consists of a mounting frame (10), a frame (11), a through-hole (12), a ball screw (13), and a drilling assembly (14). The mounting frame (10) has a frame (11) mounted on top. The frame (11) has a through-hole (12) at its lower end. The frame (11) has a ball screw (13) mounted on top. A connecting mechanism (2) is slidably mounted on the outer surface of the ball screw (13). The connecting mechanism (2) mainly includes an upper connecting frame (20) and a lower connecting frame (21). The upper connecting frame (20) is slidably mounted on the outer surface of the ball screw (13). The lower connecting frame (21) is snapped onto the bottom of the inner wall of the upper connecting frame (20). The top of the inner wall of the upper connecting frame (20) is hinged to two sets of connecting plates (24) via mounting columns (23). A buffer pad (25) is glued to the bottom of the connecting plate (24). An adapter block (27) is installed on the inner side of the connecting plate (24). The outer side of the connecting plate (24) is movably connected to the telescopic component (22), and the top of the inner wall of the lower connecting frame (21) is also fixedly installed with the receiving column two (29). The receiving column two (29) is movably sleeved with the shock-absorbing spring (210) and the telescopic column two (211). The bottom end of the telescopic column two (211) is fixedly connected to the limiting plate (212). Both ends of the limiting plate (212) are in contact with the inner side of the adapter block (27). A damping component is also provided between the upper connecting frame (20) and the lower connecting frame (21). The telescopic assembly (22) consists of a receiving column (220), a return spring (221), and a telescopic column (222). The top end of the receiving column (220) is movably hinged to the top of the inner wall of the upper connecting frame (20). The return spring (221) and the telescopic column (222) are movably sleeved inside the receiving column (220). The telescopic column (222) is elastically supported inside the receiving column (220) by the return spring (221). The other end of the telescopic column (222) is movably hinged to the outer side of the connecting plate (24). There are two telescopic assemblies (22), and the two telescopic assemblies (22) are symmetrically distributed on the outer side of the two sets of connecting plates (24). The damping assembly consists of two centrally symmetrically distributed damping rods (28). The damping rods (28) are inclined and hinged between the top of the inner wall of the upper connecting frame (20) and the limiting plate (212). The central axis of symmetry of the two damping rods (28) is the center line of the upper connecting frame (20). The buffer pad (25) is made of rubber block. The bottom of the buffer pad (25) is pressed against the top of the lower connecting frame (21). The two sets of connecting plates (24) are symmetrically distributed on both sides of the limiting plate (212). The inner side of the connecting plate (24) is provided with a slot (26). The adapter block (27) has a triangular protrusion on the side facing the connecting plate (24). The triangular protrusion is adapted to fit into the slot (26). The adapter block (27) and the connecting plate (24) are fixed by welding.

2. The drilling device for geotechnical engineering investigation according to claim 1, characterized in that: The adapter block (27) has an inclined surface at the bottom facing the telescopic column (211), and the top of the left and right sides of the limiting plate (212) is provided with a semi-circular protrusion, which is pressed and contacted with the inclined surface.

3. The drilling device for geotechnical engineering investigation according to claim 1, characterized in that: When the connecting plate (24) is vertically distributed between the upper connecting frame (20) and the lower connecting frame (21), the upper surface of the bottom of the upper connecting frame (20) and the lower surface of the top of the lower connecting frame (21) are in a state of compression contact.

4. The drilling device for geotechnical engineering investigation according to claim 1, characterized in that: The drilling assembly (14) is fixedly installed at the bottom of the lower connecting frame (21), and the drilling assembly (14) consists of a mounting plate, a motor and a drill rod. The axis of the drilling assembly (14) is collinear with the axis of the through port (12).

5. A drilling device for geotechnical engineering investigation according to claim 1, characterized in that: The upper and lower ends of the shock-absorbing spring (210) are elastically connected to the second receiving column (29) and the second telescopic column (211) in sequence. The second telescopic column (211) is adapted to be inserted into the inside of the second receiving column (29), and the second telescopic column (211) is elastically supported inside the second receiving column (29) by the shock-absorbing spring (210). The shock-absorbing spring (210) is compressed and set inside the second receiving column (29).

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