Foundation drill rod detection device

Abstract

The utility model discloses a foundation drill rod detection device which comprises a base, a drill rod and a drill rod. The multiple telescopic supporting rods are arranged on the base in an up-down rotating mode; the through hole is formed in the base in an up-down penetrating mode, a guide cylinder is coaxially arranged on the top face of the through hole, a sliding assisting cylinder is laid on the inner wall of the guide cylinder, a steel chisel penetrates through the sliding assisting cylinder in an up-down sliding mode, the inner diameter of the sliding assisting cylinder is slightly larger than the diameter of the steel chisel, and the central axis of the steel chisel and the central axis of the guide cylinder coincide and are arranged in the vertical direction. The angle and the length of the telescopic supporting rod are adjusted through the arrangement of the telescopic supporting rod rotating up and down, so that the base is adjusted to be in a horizontal state when a foundation is uneven, and the guide cylinder can be in a vertical state, so that the steel chisel is supported by the guide cylinder and is kept in the vertical state.

Description

Technical Field

[0001] The utility model relates to the technical field of ground sounding devices. More specifically, the utility model relates to a ground sounding device. Background Art

[0002] Ground sounding is a construction technology for soil layer detection. A standard diameter steel drill rod with marked scales is vertically driven into the ground soil layer by mechanical or manual means using a calibrated weight hammer. According to the number of hammer blows required for the steel drill rod to enter the ground soil layer to be detected, the concealed structure in the soil layer is detected or the allowable bearing capacity of the soil layer is roughly estimated.

[0003] Traditional sounding devices include a steel drill rod vertically fixed to the ground and a heavy hammer. Manually or mechanically, a calibrated mass heavy hammer is used to act on the steel drill rod and strike repeatedly to make the steel drill rod vertically enter the ground foundation. It is necessary to manually limit and support it, and it is relatively easy to cause injury when the staff strikes it. The authorized patent with the application number 202020581010.X discloses a ground sounding device, which is provided with a support and fixing frame including a collar, a positioning ring, a connecting collar, a connecting rod of the positioning ring, and a plug rod at the bottom of the positioning ring outside the steel drill rod. The collar is vertically arranged through a plurality of plug rods, and the collar of the support and fixing frame forms a support around the steel drill rod, and the steel drill rod can be continuously supported to maintain a vertical state without manual support. However, when a plurality of plug rods are inserted into an uneven ground foundation, the collar will shift and tilt, resulting in the steel drill rod being unable to enter the soil vertically, reducing the effective hammering energy, and on a relatively soft ground foundation, the stability of the support and fixing frame will be affected.

[0004] Therefore, how to design the structure of the ground sounding device to solve the above technical problems is worthy of deep consideration. Summary of the Utility Model

[0005] An object of the utility model is to solve at least the above problems and provide at least the advantages described hereinafter.

[0006] To achieve these objects and other advantages in accordance with the present utility model, there is provided a ground sounding device, comprising:

[0007] A base provided with a spirit level;

[0008] A plurality of telescopic support rods rotatably arranged up and down on the base;

[0009] A through hole vertically penetrating through the base, a guiding cylinder coaxially arranged on the top surface of the through hole, a sliding assisting cylinder laid on the inner wall of the guiding cylinder, a steel drill rod slidably penetrating through the sliding assisting cylinder up and down, the inner diameter of the sliding assisting cylinder being slightly larger than the diameter of the steel drill rod, the central axis of the steel drill rod coinciding with the central axis of the guiding cylinder and being arranged in the vertical direction.

[0010] Preferably, a fixing frame is provided on the top of the base;

[0011] It further includes a hammering structure, which includes:

[0012] A heavy hammer, which is located directly above the steel drill rod, and a lifting ring is provided at the upper end of the heavy hammer;

[0013] A rotary driver, which is provided at the upper end of the fixing frame, and the output shaft of the rotary driver is horizontally arranged;

[0014] A winding disc, which is provided on the output shaft of the rotary driver, a steel wire rope is wound and connected to the winding disc, and the free end of the steel wire rope is detachably arranged on the lifting ring.

[0015] Preferably, a plurality of convex blocks are evenly protruded on the periphery of the base, and a first rotation hole is horizontally opened on the convex blocks;

[0016] A plurality of telescopic support rods are rotatably arranged on the corresponding convex blocks one by one. A groove is concavely provided at the upper end of the telescopic support rod, the groove is sleeved on the convex block, and second rotation holes corresponding to the first rotation holes are opened on both sides of the groove. A shaft rod is inserted through the corresponding second rotation hole and the first rotation hole, and both sides of the shaft rod are limited and fixed by nuts.

[0017] Preferably, the telescopic support rod includes:

[0018] A first rod body and a second rod body, both the first rod body and the second rod body are hollow inside, and first threads are provided on the inner walls;

[0019] A threaded rod, on the outer wall of which a second thread corresponding to the first thread is provided, and the upper end and the lower end of the threaded rod are inserted into the lower end of the first rod body and the upper end of the second rod body respectively through threaded connection;

[0020] A foot, which is provided at the lower end of the second rod body, and the end is pointed.

[0021] Preferably, a reinforcing structure is provided on each telescopic support rod, and the reinforcing structure includes:

[0022] A connecting rod, which is rotatably arranged up and down on one side of the second rod body, and its rotating shaft is close to the foot;

[0023] A floor gripper, which is provided on the connecting rod, and a plurality of ground nails are evenly provided on the side of the floor gripper facing away from the central axis of the second rod body.

[0024] Preferably, a pair of fixing blocks are horizontally arranged on one side of the second rod body, and a fixing shaft is passed through the pair of support rod blocks, and the central axis of the fixing shaft is perpendicular to the central axis of the second rod body;

[0025] One end of the connecting rod is provided with a bushing, and the bushing is movably sleeved on the fixing shaft.

[0026] Preferably, a limiting screw hole is formed in the connecting rod;

[0027] A positioning screw hole corresponding to the limiting screw hole is formed in the second rod body, and the corresponding positioning screw hole and the limiting screw hole are limited and fixed by a bolt.

[0028] Preferably, the connecting rod is a curved rod.

[0029] Preferably, the number of the telescopic support rods is at least 3.

[0030] The utility model has at least the following beneficial effects:

[0031] First, through the arrangement of the telescopic support rods that rotate up and down, the utility model adjusts its angle and length, so that the base is adjusted to a horizontal state when the foundation is uneven, and the guide cylinder can be in a vertical state to realize the support of the guide cylinder for the steel drill rod and keep it in a vertical state.

[0032] Second, through the reinforcement structure composed of the connecting rod, the floor gripper and the ground nail, the utility model strengthens the connection between the telescopic support rod and the foundation, and has the beneficial effect of enhancing the stability of the telescopic support rod and the base on a relatively soft foundation.

[0033] Other advantages, objectives and features of the utility model will be partially reflected by the following description, and partially will be understood by those skilled in the art through the research and practice of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The side view of the foundation probing device in the use state of one of the technical solutions of the utility model;

[0035] Figure 2 The side view of the foundation probing device in another state of one of the technical solutions of the utility model;

[0036] Figure 3 The side structure schematic diagram of the base and the guide cylinder of one of the technical solutions of the utility model;

[0037] Figure 4 The top view of the base of one of the technical solutions of the utility model;

[0038] Figure 5 The side view of the telescopic support rod of one of the technical solutions of the present utility model;

[0039] Figure 6 The other side view of the telescopic support rod of one of the technical solutions of the present utility model.

[0040] Among them, the marks in each attached drawing are shown as follows:

[0041] Base 1, spirit level 14, telescopic support rod 2, through hole 11, guide cylinder 3, steel drill 4, bump 12, first rotation hole 13, first rod body 21, second rod body 22, support feet 23, groove 24, second rotation hole 25, threaded rod 26, reinforcement structure 7, connecting rod 71, floor gripper 72, ground nail 73, fixing block 81, fixing shaft 82, bushing 74, limit screw hole 75, fixing frame 5, hammering structure 6, weight 61, steel wire rope 62, winding disc 63, rotary drive 64. Detailed implementation manners

[0042] The following further describes the present utility model in detail with reference to the attached drawings, so that those skilled in the art can implement it according to the description in the specification.

[0043] It should be noted that the experimental methods described in the following implementation schemes are all conventional methods unless otherwise specified, and the reagents and materials can all be obtained from commercial channels unless otherwise specified; in the description of the present utility model, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the attached drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0044] As Figures 1 to 6 shown, the present utility model provides a ground probing device, including:

[0045] A base 1, on which a spirit level 14 is provided; specifically, the base 1 can be rectangular or cylindrical, and the spirit level 14 can be provided at the top or side of the base 1 to facilitate better observation of the spirit level 14 to determine whether the base 1 is displaced or in a horizontal state;

[0046] A plurality of telescopic support rods 2 are vertically rotatably arranged on the base 1. Specifically, the telescopic support rod 2 may include a first rod body 21 and a second rod body 22 slidably arranged on the first rod body 21, or other telescopic rods with a length adjustment structure. The telescopic support rod 2 is telescopic in length and can be vertically rotatably arranged on the base 1 through a fixed shaft body and a sleeve sleeved on the shaft body, or through the structure of a convex block 12, a first rotation hole 13, and a second rotation hole 25. The telescopic support rod 2 can be adjusted in length and angle to adjust the levelness of the base 1.

[0047] A through hole 11 is vertically opened on the base 1. A guiding cylinder 3 is coaxially arranged on the top surface of the through hole 11. A sliding assistance cylinder is laid on the inner wall of the guiding cylinder 3. A steel drill rod 4 is vertically slidably penetrated through the sliding assistance cylinder. The inner diameter of the sliding assistance cylinder is slightly larger than the diameter of the steel drill rod 4. The central axis of the steel drill rod 4 coincides with the central axis of the guiding cylinder 3 and is arranged in the vertical direction. Specifically, the through hole 11 is circular and matches the steel drill rod 4. The through hole 11 is vertically arranged. The guiding cylinder 3 can be coaxially arranged on the top surface of the through hole 11 by welding. The steel drill rod 4 is vertically slidably penetrated through the sliding assistance cylinder and the through hole 11. The lower end of the steel drill rod 4 abuts against the foundation. The common diameter of the steel drill rod in the market is 22-25 mm. The inner diameter of the sliding assistance cylinder is 1-2 mm larger than the diameter of the steel drill rod to ensure that the sliding assistance cylinder can keep the steel drill rod 4 as vertical as possible and does not hinder the sliding of the steel drill rod 4. The arrangements of the guiding cylinder 3, the sliding assistance cylinder, and the through hole 11 help to keep the steel drill rod 4 in a vertical state when the base 1 is level. The material of the sliding assistance cylinder can be polytetrafluoroethylene or lubricating oil. The sliding assistance layer helps to reduce the friction between the steel drill rod 4 and the inner wall of the guiding cylinder 3 to ensure that the hammering energy of the steel drill rod 4 under the hammering of the heavy hammer 61 does not decrease.

[0048] In the above technical solution, when the plurality of telescopic support rods 2 are opened and their lower ends abut against the foundation, observe the spirit level 14 on the foundation to judge whether the base 1 is level. If not, it means that the guiding cylinder 3 is not vertically arranged. At this time, the steel drill rod 4 is not vertical either. Direct hammering will make the steel drill rod 4 unable to penetrate vertically into the soil, and the effective hammering energy will decrease. By vertically rotating the telescopic support rod 2 and correspondingly adjusting its length, the base 1 is adjusted to a level state (observed through the spirit level 14), which can make the guiding cylinder 3 and the steel drill rod 4 in a vertical state. The arrangement of the telescopic support rod 2 can also realize the retraction and deployment of the foundation soil exploration device, which has the beneficial effect of convenient storage.

[0049] In another technical solution, a fixing frame 5 is provided on the top of the base 1; specifically, the fixing frame 5 can be fixedly arranged on the top of the base 1 by welding, and can provide a supporting force for the following hammering structure 6;

[0050] It further includes a hammering structure 6, which includes:

[0051] A weight 61, which is located directly above the steel drill 4, and a lifting ring is provided at the upper end of the weight 61; specifically, the mass of the weight 61 can be 10 kg, 63.5 kg or 120 kg. Among them, the mass of the weight 61 is related to how to record the number of hammer blows when the steel drill 4 penetrates into the soil by 10 cm or 30 cm. When the mass of the weight 61 is 10 kg, the number is recorded every 30 cm; when the mass of the weight 61 is 63.5 kg or 120 kg, the number is recorded every 10 cm;

[0052] A rotary driver 64, which is arranged at the upper end of the fixing frame 5, and the output shaft of the rotary driver 64 is horizontally arranged; the rotary driver 64 can be a rotary motor, a rotary cylinder or a hydraulic rotary oil cylinder, and the fixed end of the rotary driver 64 can be fixedly arranged on the inner top end of the fixing frame 5 by welding or screwing, and its output shaft is horizontally arranged;

[0053] A winding disc 63, which is arranged on the output shaft of the rotary driver 64, and a steel wire rope 62 is wound and connected to the winding disc 63, and the free end of the steel wire rope 62 is detachably arranged on the lifting ring; specifically, when the rotary driver 64 is started, its output shaft drives the winding disc 63 to rotate, releases or retracts the steel wire rope 62 wound on the winding disc 63, so as to correspondingly release or retract the weight 61, so that the weight 61 descends to do a free fall motion or rises. Among them, the free end of the steel wire rope 62 is detachably connected through a rope buckle, so as to replace the weight 61 with different masses.

[0054] In the above solution, the rotary drive 64 is preferably a rotary motor, and its model is 90WD-M05020-24V. When the weight 61 needs to hammer the drill steel 4, the weight 61 is lifted a certain distance H from the top of the drill steel 4 (which can be lifted by the rotary drive 64 and the winding disc 63). The rotary drive 64 is started to drive the winding disc 63 to rotate, and the steel wire rope 62 is released. The steel wire rope 62 has no tensile force on the weight 61, and the weight 61 makes a free-fall motion. The falling generates a certain gravitational potential energy to hammer the drill steel 4, so that it enters the soil, realizing the detection of the allowable bearing capacity of the foundation; when the hammering is completed in sequence, the rotary drive 64 is rotated in the reverse direction to drive the winding disc 63 to rotate in the reverse direction, and the steel wire rope 62 is recovered, so that the steel wire rope 62 has a traction tensile force on the weight 61, driving the weight 61 to move upward until the distance between the weight 61 and the top of the drill steel 4 is H, and then the next hammering can be carried out; wherein, the rotation speed of the rotary drive 64 is greater than the falling speed of the weight 61 to ensure that when the weight 61 makes a free-fall motion, the steel wire rope 62 has no tensile force on it, so as to reduce the friction generated between the winding disc 63 and the steel wire rope 62 and reduce the influence on the free-fall motion of the weight 61.

[0055] In another technical solution, a plurality of convex blocks 12 are uniformly protruded on the circumferential side of the base 1, and a first rotation hole 13 is horizontally opened on the convex block 12;

[0056] A plurality of telescopic support rods 2 are rotatably arranged on the plurality of convex blocks 12 in a one-to-one correspondence. A groove 24 is concavely provided at the upper end of the telescopic support rod 2. The groove 24 is sleeved on the convex block 12. Second rotation holes 25 corresponding to the first rotation holes 13 are opened on both sides of the groove 24. A shaft rod is penetrated through the corresponding second rotation hole 25 and the first rotation hole 13, and both sides of the shaft rod are limited and fixed by nuts; specifically, the convex block 12 can be fixedly arranged on the circumferential side of the base 1 by welding. The convex block 12 is penetrated into the groove 24, and a shaft rod is penetrated through the corresponding second rotation hole 25 and the first rotation hole 13, which can help the telescopic support to rotate up and down on the convex block 12.

[0057] In another technical solution, the telescopic support rod 2 includes:

[0058] A first rod body 21 and a second rod body 22. Both the first rod body 21 and the second rod body 22 are hollow inside, and first threads are provided on the inner walls; specifically, the materials of the first rod body 21 and the second rod body 22 can be stainless steel, carbon steel or hard metal and other materials to have a certain stiffness and hardness to provide a supporting force for the base 1;

[0059] A threaded rod 26 is provided with a second thread corresponding to the first thread on its outer wall. The upper and lower ends of the threaded rod 26 are respectively inserted into the lower end of the first rod body 21 and the upper end of the second rod body 22 through threaded connection. The settings of the threaded rod 26, the first thread, and the second thread help to realize the threaded connection between the threaded rod 26 and the first rod body 21 and the second rod 22 respectively. By tightening the length of the first rod body 21 or the second rod body 22 through the threaded rod 26, it helps to realize the stepless adjustment of the length of the telescopic support rod 2 and achieve its telescopic function.

[0060] A foot 23 is provided at the lower end of the second rod body 22, and its end is pointed. Specifically, through the pointed setting of the foot 23, the area of its insertion into the foundation is increased to ensure that the telescopic support rod 2 is inserted into the foundation more stably, so as to utilize the foundation to provide a supporting force for the second rod body 22.

[0061] In the above technical solution, when the foundation is uneven and the base 1 is adjusted to a horizontal state by rotating the angle of the telescopic support rod 2, the length of the telescopic support rod 2 can be adjusted by adjusting the length of the first rod body 21 or the second rod body 22 by tightening the threaded rod 26 until the foot 23 is inserted into the foundation. The setting of the threaded rod 26 helps to adjust the length of the telescopic support rod 2.

[0062] In another technical solution, a reinforcement structure 7 is provided on each telescopic support rod 2. The reinforcement structure 7 includes:

[0063] A connecting rod 71 is rotatably arranged up and down on one side of the second rod body 22, and its rotating shaft is close to the foot 23. Specifically, the connecting rod 71 can be rotated up and down through structures such as a fixing block 81, a fixing shaft 82, and a bushing 74 arranged on one side of the second rod body 22. The rotating shaft of the connecting rod 71 is close to the foot 23, so that the following floor gripper 72 can be more conveniently and stably nailed to the foundation through the ground nails 73.

[0064] A floor gripper 72 is arranged on the connecting rod 71. A plurality of ground nails 73 are evenly arranged on the side of the floor gripper 72 facing away from the central axis of the second rod body 22. Specifically, the floor gripper 72 can be fixed to the upper end or the middle side wall of the connecting rod 71 by welding or screwing. The setting of the ground nails 73 helps to increase the contact area with the foundation, so that the floor gripper 72 is firmly arranged on the foundation to ensure the stability of the telescopic support rod 2 on a relatively soft foundation.

[0065] In the above technical solution, when adjusting a plurality of telescopic support rods 2 by rotation and telescoping to keep the base 1 horizontal, an external force is applied to the reinforcement structure 7 on each telescopic support rod 2. By rotating the connecting rod 71 downward, the floor gripper 72 is driven to rotate until the floor gripper 72 is parallel to the foundation surface. Then, an external force is applied to the floor gripper 72 to drive the ground nails 73 on its bottom surface to be nailed into the foundation, so that the telescopic support rod 2 can be stably supported on a relatively soft foundation to ensure that the base 1 remains stable and does not tip over. Then, by hammering the steel drill 4, the allowable bearing capacity of the foundation is detected. After the detection, the floor gripper 72 can be lifted by means of a crowbar or other devices.

[0066] In another technical solution, the connecting rod 71 is a curved rod; specifically, the connecting rod 71 is a curved rod protruding upward to prevent the lower side wall of the connecting rod 71 from affecting the complete nailing of the ground nails on the floor gripper 72 into the foundation.

[0067] In another technical solution, a pair of fixing blocks 81 are horizontally provided on one side of the second rod body 22, and a fixing shaft 82 is passed through the pair of support rod blocks. The central axis of the fixing shaft 82 is perpendicular to the central axis of the second rod body 22;

[0068] One end of the connecting rod 71 is provided with a bushing 74, and the bushing 74 is movably sleeved on the fixing shaft 82; specifically, the fixing blocks 81 can be horizontally fixed on one side of the second rod body 22 by welding or screwing. The setting of the central axis of the fixing shaft 82 helps the connecting rod 71 to rotate up and down on the fixing shaft 82. Among them, the bushing 74 is movably sleeved on the fixing shaft 82 so that when an external force is applied to the connecting rod 71, the connecting rod 71 can rotate up and down with the assistance of the fixing shaft 82 and the bushing 74, so as to move the floor gripper 72 downward and nail the ground nails 73 into the soft foundation to reinforce the stability of the telescopic support rod 2.

[0069] In another technical solution, a limit screw hole 75 is provided on the connecting rod 71;

[0070] A positioning screw hole corresponding to the limit screw hole 75 is provided on the second rod body 22, and the corresponding positioning screw hole and the limit screw hole 75 are limited and fixed by bolts; specifically, the settings of the limit screw hole 75 and the positioning screw hole help to limit and fix the connecting rod 71 on one side of the second rod body 22 by bolts, so that when the telescopic support rod 2 is retracted, the reinforcement structure 7 can also be retracted to reduce its volume. Among them, the limit screw hole 75 and the positioning screw hole can also be replaced with other structures that can limit and fix the connecting rod 71 on the second rod body 22.

[0071] In another technical solution, the number of the telescopic support rods 2 is at least 3; specifically, a triangle has stability. When the number of the telescopic support rods 2 is 3, the 3 telescopic support rods 2 are evenly distributed on the base 1 to form a triangle to provide a stable supporting force for the base 1.

[0072] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. A foundation drilling device, characterized in that: include: A base, on which a level bubble is provided; A plurality of telescopic support rods, wherein the plurality of telescopic support rods are rotatably arranged on the base up and down; A through hole is opened on the base through the upper and lower parts, a guide cylinder is coaxially arranged on the top surface of the through hole, a sliding cylinder is laid on the inner wall of the guide cylinder, a steel bar is passed through the sliding cylinder for sliding up and down, the inner diameter of the sliding cylinder is slightly larger than the diameter of the steel bar, the central axis of the steel bar coincides with the central axis of the guide cylinder, and is arranged along the vertical direction.

2. The foundation drilling device according to claim 1, characterized in that: A fixing frame is provided on the top of the base; Also included is a hammering structure comprising: A heavy hammer, which is located directly above the steel drill, and a lifting ring is provided on the upper end of the heavy hammer; A rotary driver, which is arranged at the upper end of the fixing frame, and the output shaft of the rotary driver is arranged horizontally; A winding disk is arranged on the output shaft of the rotary driver, a steel wire rope is wound around the winding disk, and the free end of the steel wire rope is detachably arranged on the lifting ring.

3. The foundation drilling device according to claim 1, characterized in that: A plurality of protrusions are evenly provided on the circumference of the base, and a first rotation hole is horizontally opened on the protrusions; A plurality of telescopic support rods are rotatably arranged on a plurality of protrusions in a one-to-one correspondence, a groove is concavely arranged on the upper end of the telescopic support rod, and the groove is sleeved on the protrusion, and second rotation holes corresponding to the first rotation holes are opened on both sides of the groove, and shaft rods are passed through the corresponding second rotation holes and the first rotation holes, and both sides of the shaft rods are fixed by nuts.

4. The foundation drilling device according to claim 1, characterized in that: The telescopic support rod comprises: A first rod body and a second rod body, wherein the first rod body and the second rod body are both hollow inside and have inner walls provided with first threads; A threaded rod, on the outer wall of which a second thread corresponding to the first thread is provided, and the upper end and the lower end of the threaded rod are correspondingly inserted into the lower end of the first rod body and the upper end of the second rod body through threaded connection; The support foot is arranged at the lower end of the second rod body, and the end thereof is pointed.

5. The foundation drilling device according to claim 4, characterized in that: Each telescopic support rod is provided with a reinforcement structure, and the reinforcement structure comprises: A connecting rod, which is rotatably disposed on one side of the second rod body, and whose rotation axis is disposed close to the supporting foot; A gripping plate is arranged on the connecting rod, and a plurality of ground spikes are evenly arranged on a side of the gripping plate facing away from the central axis of the second rod body.

6. The foundation drilling device according to claim 5, characterized in that: A pair of fixing blocks are horizontally arranged on one side of the second rod body, and a fixing shaft is passed through the pair of supporting rod blocks, and the central axis of the fixing shaft is perpendicular to the central axis of the second rod body; A shaft sleeve is arranged on one end of the connecting rod, and the shaft sleeve is movably sleeved on the fixed shaft.

7. The foundation drilling device according to claim 5, characterized in that: The connecting rod is provided with a limited screw hole; The second rod body is provided with a positioning screw hole corresponding to the limiting screw hole, and the corresponding positioning screw hole and the limiting screw hole are fixed by bolts and nuts.

8. The foundation drilling device according to claim 5, characterized in that: The connecting rod is a curved rod.

9. The foundation drilling device according to claim 1, characterized in that: The number of the telescopic support rods is at least 3.

Images