Pile foundation hole depth detection equipment for pile foundation construction

Abstract

The utility model discloses pile foundation hole depth detection equipment for pile foundation construction, which comprises an equipment base, the outer surface of the equipment base is uniformly provided with telescopic fixed rods through connecting seats, and the telescopic fixed rods enable the pile foundation hole depth detection equipment to adjust the length and the supporting angle according to the diameter of a pile foundation hole. A telescopic cylindrical rod which is used for carrying out rotary lifting adjustment and is provided with an external thread surface movably penetrates through the central position of the end part of the equipment base, and a depth detection rod which is used for carrying out driving adjustment on different pile foundation hole depths is arranged in the telescopic cylindrical rod in a limited telescopic manner. The length can be flexibly adjusted according to the diameter of a pile foundation hole, and equipment can be stably supported by matching with a positioning pile and a horizontal positioning pile under the special working conditions of large-diameter pile foundation holes, soft ground and the like, so that the application scene of the equipment is greatly widened, and the application range of the equipment is remarkably widened.

Description

Technical Field

[0001] This utility model belongs to the field of pile foundation construction technology, and specifically relates to a pile foundation hole depth detection device for pile foundation construction. Background Technology

[0002] A pile foundation is a deep foundation consisting of piles and a pile cap connecting the pile tops, or a single pile foundation consisting of a column connected to the pile foundation. If the entire pile is buried in the soil and the bottom of the pile cap is in contact with the soil, it is called a low-pile-cap pile foundation; if the upper part of the pile is exposed above ground and the bottom of the pile cap is above ground level, it is called a high-pile-cap pile foundation. Building pile foundations are usually low-pile-cap pile foundations. Pile foundation holes are holes drilled for cast-in-place concrete piles to reinforce the underground foundation and improve the load-bearing capacity and seismic resistance of the building foundation. During pile foundation construction, it is necessary to measure the depth of the pile foundation hole. The traditional method is to use a measuring rope and a plumb bob inserted into the bottom of the pit to measure the depth. However, because the measuring rope is made of a flexible material, the plumb bob may wobble as it moves downwards into the pile foundation hole. This wobble can cause foreign objects to adhere to the surface of the plumb bob, and the wobbling can also lead to inaccurate readings, thus weakening the practicality of the measuring device.

[0003] To address this, a pile foundation hole depth measuring device for pile foundation construction, with announcement number "CN222481359U", includes a mounting frame. The upper surface of the mounting frame has a positioning groove extending to its lower surface. A positioning block is slidably mounted on the mounting frame through the positioning groove. The upper surface of the positioning block has a sliding groove extending to its lower surface. A fixing block is slidably mounted within the sliding groove. A measuring mechanism is installed on the fixing block. The length extending downwards into the pile foundation hole through the fixing block is the current depth of the pile foundation hole. This method provides accurate measurement. Compared to traditional methods using a plumb bob and measuring rope, where the plumb bob is prone to colliding with foreign objects on the pit sidewall when inserted into the pit, this method avoids damage to the plumb bob and prevents the measuring rope from swaying and hindering measurement. This ensures the accuracy of pile foundation hole measurement while increasing the practicality of the measuring device.

[0004] However, for the aforementioned pile foundation hole depth measuring device for pile foundation construction, although the positioning rod is inserted into the ground so that the lower surface of the limiting plate is in contact with the ground, making the mounting frame horizontal and the fixing block vertical, there are still some obvious defects in its use: the positioning rod is fixedly set on the bottom of the mounting frame supporting the pile hole. Since the positioning rod cannot be adjusted in angle, it is impossible to fix the depth measuring device frame on the larger pile hole when encountering pile holes of different diameters, thus reducing the applicable range of the aforementioned depth measuring device. Utility Model Content

[0005] The purpose of this invention is to provide a pile foundation hole depth detection device for pile foundation construction, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pile foundation hole depth detection device for pile foundation construction, comprising:

[0007] The equipment base has a telescopic fixed rod evenly provided on its outer surface via a connecting seat. This rod allows the pile hole depth detection device to adjust its length and support angle according to the diameter of the pile hole. A telescopic cylindrical rod with an external threaded surface is movably inserted through the center of the end of the equipment base for rotational and lifting adjustment. A depth detection rod for driving and adjusting different pile hole depths is provided inside the telescopic cylindrical rod for limited telescopic extension.

[0008] A circular seat is movably sleeved on the outside of the telescopic cylindrical rod, with its bottom end fixed at the center of the equipment base. The upper end face of the circular seat is provided with a drive rotating disk for driving the telescopic cylindrical rod to rise and fall on the equipment base. A gear A is rotatably provided on one side of the bottom end of the telescopic cylindrical rod to engage with and drive the depth detection rod to rise and fall for pile hole depth detection.

[0009] Preferably, one end of the telescopic fixed rod is internally threaded with an extension support rod, and one end of the extension support rod is provided with a positioning pile to fix the telescopic fixed rod to a vertical state for fixed support of the pile foundation hole depth detection equipment. The positioning pile is threaded through with a horizontal positioning pile that is fixed to the ground in the lateral state of the telescopic fixed rod, ensuring that the equipment will not shake or shift when performing depth detection, which greatly improves the accuracy of the detection.

[0010] Preferably, the upper end of the connecting seat is provided with a limiting plate that limits the telescopic fixed rod when it is in a horizontal state, and the limiting plate is fixed to the outer surface of the equipment base. When the telescopic fixed rod is adjusted to a horizontal state, the limiting plate can prevent the telescopic fixed rod from rotating excessively and ensure that it is maintained at a suitable support angle.

[0011] Preferably, a servo motor A is provided on one side of the end of the equipment base, and the servo motor A is provided with drive teeth, which mesh with a toothed ring installed outside the drive rotating disk. The drive rotating disk is threaded onto the outside of the telescopic cylindrical rod. Since the drive rotating disk is threaded onto the outside of the telescopic cylindrical rod, when the drive rotating disk rotates, it can drive the telescopic cylindrical rod to rise and fall on the equipment base for adjustment.

[0012] Preferably, the inner walls of the telescopic cylindrical rod are provided with strip-shaped guide grooves, and the depth detection rod is provided with a guide plate that slides in the guide groove at the corresponding position, so as to ensure the accuracy and stability of the depth detection rod when it rises and falls in the telescopic cylindrical rod.

[0013] Preferably, a vertical groove is provided on one side of the depth detection rod, and a toothed plate adapted to mesh with the gear is installed in the groove. By driving the gear to rotate, it meshes with the toothed plate, thereby realizing the lifting and lowering drive of the depth detection rod.

[0014] Preferably, a servo motor B is mounted on the bottom of the outer side of the depth detection rod via a base plate, and the shaft of the servo motor B is fixed to the center end of the gear. Compared with the traditional chain or rope drive method, it has higher transmission efficiency and accuracy.

[0015] Preferably, a depth detection sensor is embedded in the bottom surface of the depth detection rod, and a buzzer is provided on one side of the device base. The buzzer is connected to the depth detection sensor through an external control box. When the detected depth reaches a preset value, the depth detection sensor transmits a signal to the external control box, which then controls the buzzer to sound an alarm to remind the operator.

[0016] Compared with the prior art, the technical effects and advantages of this utility model are as follows: This pile foundation hole depth detection equipment for pile foundation construction...

[0017] This utility model, by setting up a telescopic fixed rod and an extension support rod, can flexibly adjust the length according to the diameter of the pile hole. In conjunction with positioning piles and horizontal positioning piles, it can stably support the equipment in special working conditions such as large-diameter pile holes and soft ground, which greatly expands the application scenarios of the equipment and significantly improves its applicability.

[0018] This equipment is driven by a servo motor A. The drive gear meshes with the external gear ring of the drive rotating disk, causing the drive rotating disk, which is threaded onto the telescopic cylindrical rod, to rotate, thus achieving the lifting and lowering adjustment of the telescopic cylindrical rod. This automated drive design greatly saves manpower, significantly improves adjustment efficiency, and meets the high-efficiency requirements of frequent depth detection operations in large-scale pile foundation construction.

[0019] This invention features a strip-shaped guide groove inside the telescopic cylindrical rod, and a guide plate at the corresponding position of the depth detection rod to ensure vertical lifting and lowering of the rod, avoiding tilting errors. Simultaneously, the depth detection rod is lifted and lowered via a servo motor B driving a gear that meshes with the strip-shaped toothed plate, achieving high transmission efficiency and precision. Combined with the linkage between the depth detection sensor and the buzzer, it can accurately detect and promptly alert the operator to the depth of the pile foundation hole. Attached Figure Description

[0020] Figure 1 This is a diagram showing the first working state of the pile foundation hole depth detection device of this utility model;

[0021] Figure 2 This is a diagram showing the second working state of the pile foundation hole depth detection device of this utility model;

[0022] Figure 3 This is a top view of the telescopic cylindrical rod and depth detection rod of this utility model;

[0023] Figure 4 This is a front view of the telescopic cylindrical rod and depth detection rod of this utility model;

[0024] Figure 5 This is a bottom view of the drive rotary disk of this utility model.

[0025] In the diagram: 1. Equipment base; 2. Connecting seat; 3. Telescopic fixed rod; 4. Telescopic cylindrical rod; 5. Depth detection rod; 6. Circular seat; 7. Drive rotary disk; 8. Gear; 9. Extension support rod; 10. Positioning stake; 11. Horizontal positioning stake; 12. Limiting plate; 13. Servo motor A; 14. Drive gear; 15. Gear ring; 16. Strip guide groove; 17. Guide strip plate; 18. Strip groove; 19. Strip gear plate; 20. Servo motor B; 21. Depth detection sensor; 22. Buzzer. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-5 This utility model provides a technical solution: a pile foundation hole depth detection device for pile foundation construction, comprising:

[0028] The equipment base 1 has telescopic fixed rods 3 evenly provided on its outer surface via connecting seats 2. These rods allow the pile hole depth detection device to adjust its length and support angle according to the diameter of the pile hole. The outer surface of the equipment base 1 is evenly connected to the telescopic fixed rods 3 via connecting seats 2, providing an installation position for the telescopic fixed rods 3 so that their angle can be adjusted around the equipment base 1. A telescopic cylindrical rod 4 is movable through the center of its end, providing support and guidance for the rotation and lifting adjustment of the telescopic cylindrical rod 4. A servo motor A13 is installed on one side of the end of the equipment base 1, providing the power source for driving the rotation of the rotating disk 7.

[0029] The telescopic support rod 3 provides stable support for the entire equipment by adjusting its length and support angle according to the diameter of the pile hole. One end has an internally threaded extension rod 9, which increases the overall length of the telescopic support rod 3 to accommodate larger diameter pile holes. When adjusted to a vertical position, the positioning stake 10 is inserted into the ground to provide vertical support for the equipment, ensuring that the equipment will not shake or shift during testing. In a lateral position, the horizontal positioning stake 11 on the positioning stake 10 can be unscrewed and fixed to the ground, further enhancing stability.

[0030] A telescopic cylindrical rod 4 with an external threaded surface is movably inserted through the center of the end of the equipment base 1. This telescopic cylindrical rod 4 provides a channel for the installation and lifting of the depth detection rod 5. Its external threaded surface is threadedly engaged with the drive rotating disk 7, and its lifting is achieved by the rotation of the drive rotating disk 7. A gear A8 is rotatably mounted on the outer side of the bottom end, used to engage and drive the depth detection rod 5 to adjust its height, thereby performing pile foundation hole depth detection. Simultaneously, the strip-shaped guide groove 16 in its inner cavity provides a sliding track for the guide plate 17 on the depth detection rod 5, ensuring the accuracy and stability of the lifting of the depth detection rod 5.

[0031] The telescopic cylindrical rod 4 has an inner limit telescopic extension and retraction device, which is a depth detection rod 5 that drives and adjusts the depth of different pile foundation holes.

[0032] The circular seat 6 is movably sleeved on the outside of the telescopic cylindrical rod 4, with its bottom end fixed to the center of the end of the equipment base 1. The circular seat 6 provides certain limits and support for the telescopic cylindrical rod 4, making it more stable during rotation and lifting. Simultaneously, its bottom end fixed to the center of the end of the equipment base 1 serves to connect the equipment base 1 and the telescopic cylindrical rod 4.

[0033] The upper end face of the ring seat 4 is equipped with a rotating drive disk 7 for driving the telescopic cylindrical rod 4 to rise and fall on the equipment base 1. The drive disk 7 is threadedly connected to the telescopic cylindrical rod 4, and when it rotates, it drives the telescopic cylindrical rod 4 to rise and fall on the equipment base 1. A toothed ring 15 is installed on its exterior, which meshes with the drive teeth 14 on the servo motor A13, receives the power output of the servo motor A13, and realizes its own rotation.

[0034] A gear A8 is rotatably mounted on one side of the bottom outer end of the telescopic cylindrical rod 4, which engages with a depth detection rod 5 to adjust its height for pile hole depth detection. This gear A8 meshes with a strip-shaped toothed plate 19 on one side of the depth detection rod 5, thereby driving the depth detection rod 5 to adjust its height and achieve pile hole depth detection. Its rotation is powered by a servo motor B20.

[0035] The telescopic fixed rod 3 has an extension support rod 9 at one end with an internal thread. The extension support rod 9 is connected to the telescopic fixed rod 3 through the internal thread and can extend or retract the telescopic fixed rod 3, increasing the overall length of the telescopic fixed rod 3 to accommodate pile foundation holes of different diameters and provide a wider support range for the equipment.

[0036] Furthermore, one end of the extension rod 9 is equipped with a positioning pile 10, which allows the telescopic fixed rod 3 to be adjusted to a vertical state for fixed support of the pile foundation hole depth detection equipment. A horizontal positioning pile 11, threaded through the positioning pile 10, is fixed to the ground in the lateral position of the telescopic fixed rod. When the telescopic fixed rod 3 is adjusted to a vertical state, the positioning pile 10 inserts into the ground, providing vertical fixed support for the pile foundation hole depth detection equipment, ensuring the stability of the equipment during the detection process and preventing shaking or displacement. Simultaneously, the positioning pile 10 has threaded holes for the horizontal positioning pile 11, used to install the horizontal positioning pile 11. When the telescopic fixed rod 3 is in a lateral position, the horizontal positioning pile 11 is unscrewed and fixed to the ground, providing additional lateral support for the equipment, enhancing its stability under special working conditions (such as soft ground), and preventing the equipment from tilting or sliding due to uneven ground or external forces.

[0037] The telescopic fixed rod 3 is connected to the equipment base 1 via the connecting seat 2, and its angle can be adjusted around the connecting seat 2. One end is connected to the extension support rod 9 via an internal thread to achieve length adjustment. The positioning stake 10 is installed at one end of the extension support rod 9, and the horizontal positioning stake 11 is threaded through the positioning stake 10, and can be unscrewed and fixed to the ground when needed.

[0038] The upper end of the connecting seat 2 is provided with a limiting plate 12 to limit the telescopic fixed rod 3 in a horizontally horizontal state. The limiting plate 12 is fixed to the outer surface of the equipment base 1, serving as a bridge connecting the equipment base 1 and the telescopic fixed rod 3, allowing the telescopic fixed rod 3 to adjust its angle relative to the equipment base 1 to accommodate pile foundation holes of different diameters. Simultaneously, the limiting plate 12 at the upper end of the connecting seat 2 is used to limit the rotation angle of the telescopic fixed rod 3 in a horizontally horizontal state. One end of the connecting seat 2 is fixed to the outer surface of the equipment base 1, and the other end is connected to the telescopic fixed rod 3, allowing the telescopic fixed rod 3 to change angle around the connection point. The limiting plate 12 is fixed to the upper end of the connecting seat 2 and to the outer surface of the equipment base 1, thereby limiting the telescopic fixed rod 3 in a horizontally horizontal state.

[0039] A servo motor A13 is provided on one side of the end of the equipment base 1, and the servo motor A13 is provided with a drive tooth 14, and the drive tooth 14 meshes with a toothed ring 15 installed on the outside of the drive rotating disk 7, and the drive rotating disk 7 is threadedly sleeved on the outside of the telescopic cylindrical rod 4.

[0040] The telescopic cylindrical rod 4 has two inner walls with strip-shaped guide grooves 16. The strip-shaped guide grooves 16 cooperate with the guide plate 17 on the depth detection rod 5 to guide the lifting and lowering movement of the depth detection rod 5 in the telescopic cylindrical rod 4, restrict the radial movement of the depth detection rod 5, and ensure that the depth detection rod 5 can only lift and lower along the axial direction, thereby improving the accuracy of depth detection.

[0041] A guide plate 17 is vertically provided at the position of the depth detection rod 5 corresponding to the guide groove 16, and slides in the guide groove 16. The guide plate 17 cooperates with the strip guide groove 16 in the inner cavity of the telescopic cylindrical rod 4 to ensure the stability and accuracy of the depth detection rod 5 during the lifting and lowering process, and to prevent the depth detection rod 5 from tilting or shaking in the telescopic cylindrical rod 4.

[0042] The telescopic cylindrical rod 4 movably passes through the center of the end of the equipment base 1, allowing it to rotate and move up and down on the equipment base 1. It is externally sleeved with a circular seat 6, the bottom of which is fixed to the center of the end of the equipment base 1, providing certain limits and support. Its external threaded surface is threadedly connected to the drive rotating disk 7, and its rotation enables lifting and lowering. One side of its bottom end is rotatably connected to a gear A8, which meshes with a strip-shaped toothed plate 19 on one side of the depth detection rod 5, driving the lifting and lowering of the depth detection rod 5. The strip-shaped guide groove 16 in the inner cavity cooperates with the guide plate 17 on the depth detection rod 5, restricting the direction of movement of the depth detection rod 5.

[0043] The depth detection rod 5 has a vertically oriented slot 18 on one side, and a toothed plate 19 adapted to mesh with and drive the gear 8 is installed in the slot 18. The depth detection rod 5 extends into the pile hole and detects the depth of the pile hole through its own lifting and lowering adjustment. The toothed plate 19 on one side meshes with the gear A8, and is driven by the gear A8 to achieve lifting and lowering. The depth detection sensor 21 at the bottom is used to detect the depth of the pile hole in real time and transmit the signal to the external control box. At the same time, the guide plate 17 cooperates with the strip guide groove 16 in the inner cavity of the telescopic cylindrical rod 4 to ensure accuracy during the lifting and lowering process.

[0044] A servo motor B20 is mounted on the bottom of the outer side of the depth detection rod 5 via a base plate. The shaft of the servo motor B20 is fixed to the center end of the gear 8. The depth detection rod 5 is limited to telescopic movement within the telescopic cylindrical rod 4, allowing it to move up and down within the rod. A vertically oriented slot 18 is provided on one side, and a toothed plate 19 is installed within the slot 18, meshing with the gear A8. A guide plate 17 is vertically positioned corresponding to the position of the slotted guide groove 16 in the inner cavity of the telescopic cylindrical rod 4, and slides within the slotted guide groove 16. The servo motor B20 is mounted on the bottom of the outer side via the base plate, and its shaft is fixed to the center end of the gear A8, providing power for the rotation of the gear A8. A depth detection sensor 21 is embedded in the bottom surface for detecting depth and transmitting signals.

[0045] A depth sensor 21 is embedded in the bottom surface of the depth detection rod 5 to detect the position of the depth detection rod 5 in real time, thereby obtaining the depth information of the pile foundation hole. The detected depth signal is transmitted to the external control box to provide the operator with accurate pile foundation hole depth data. A buzzer 22 is provided on one side of the end of the equipment base 1, and the buzzer 22 is connected to the depth detection sensor 21 through the external control box. When the depth detection sensor 21 detects that the depth has reached the preset value, the external control box controls the buzzer 22 to sound an alarm, reminding the operator that the pile foundation hole depth has reached the requirement.

[0046] Specifically, during use, adjust the telescopic rod 3 first according to the diameter of the pile hole. By screwing the extension rod 9 into or out of the telescopic rod 3 using the internal thread, its overall length can be changed to accommodate pile holes of different sizes. Then, adjust the support angle of the telescopic rod 3 around the connecting seat 2. If the pile hole diameter is large, the unfolding angle of the telescopic rod 3 can be increased. When the telescopic rod 3 is adjusted to a vertical state, the positioning stake 10 is inserted into the ground, providing stable vertical support for the equipment and preventing shaking or displacement during testing. In special working conditions, such as soft ground, the horizontal positioning stake 11 on the positioning stake 10 can be screwed out and fixed to the ground to enhance the stability of the equipment laterally. Simultaneously, the limiting plate 12 at the upper end of the connecting seat 2 restricts excessive rotation of the telescopic rod 3 in a horizontal state, ensuring its support angle is appropriate.

[0047] The servo motor A13 on one side of the end of the equipment base 1 is started. Its drive gear 14 meshes with the gear ring 15 on the outside of the drive rotating disk 7, causing the drive rotating disk 7 to rotate. Since the drive rotating disk 7 is threaded onto the outside of the telescopic cylindrical rod 4, the rotation of the drive rotating disk 7 causes the telescopic cylindrical rod 4 to be raised and lowered on the equipment base 1. The gear A8 on the outside of the bottom end of the telescopic cylindrical rod 4 rotates under the drive of the servo motor B20 (the servo motor B20 is installed on the bottom of the outside of the depth detection rod 5, and its shaft is fixed to the center end of the gear A8). The gear A8 meshes with the strip toothed plate 19 on one side of the depth detection rod 5, thereby driving the depth detection rod 5 to rise and fall within the telescopic cylindrical rod 4. The strip guide groove 16 in the inner cavity of the telescopic cylindrical rod 4 cooperates with the guide strip plate 17 on the depth detection rod 5 to ensure that the depth detection rod 5 can only move in the axial direction when rising and falling, avoiding radial movement and ensuring detection accuracy and stability.

[0048] The depth detection rod 5 is inserted into the pile hole. As it rises and falls, the depth detection sensor 21 embedded at the bottom detects its position in real time, obtains the depth information of the pile hole, and transmits the detected depth signal to the external control box. When the depth detection sensor 21 detects that the depth has reached the preset value, the buzzer 22 on one side of the base 1 of the external control box sounds an alarm to remind the operator that the depth of the pile hole has reached the requirement.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pile hole depth detection apparatus for pile construction, characterized by, Include: The device base (1), the outer surface of the device base (1) is uniformly provided with the telescopic fixed rod (3) which makes the pile hole depth detection device adjust the length and support angle according to the diameter of the pile hole, the telescopic fixed rod (3) is connected with the connecting seat (2), the center position of the end of the device base (1) is movably penetrated by the telescopic cylindrical rod (4) which is provided with an external screw surface and is used for rotating and lifting adjustment, the telescopic cylindrical rod (4) is movably penetrated by the depth detection rod (5) which is used for driving and adjusting the depth of different pile holes; The circular ring seat (6) is movably sleeved on the outside of the telescopic cylindrical rod (4), the bottom end is fixed on the center position of the end of the device base (1), the upper end surface of the telescopic cylindrical rod (4) is movably provided with the driving rotary disc (7) which is used for driving the telescopic cylindrical rod (4) to rise and fall on the device base (1), the outside of the bottom end of the telescopic cylindrical rod (4) is movably provided with the gear (8) which is used for driving the depth detection rod (5) to rise and fall and detect the depth of the pile hole.

2. The pile hole depth detection device for pile construction according to claim 1, characterized in that: The telescopic fixed rod (3) is movably provided with the extension support rod (9) at one end, the extension support rod (9) is provided with the positioning pile (10) at one end, the positioning pile (10) is used for fixing and supporting the telescopic fixed rod (3) when the telescopic fixed rod (3) is adjusted to the vertical state, and the horizontal positioning pile (11) is movably penetrated on the positioning pile (10) and is used for fixing on the ground when the telescopic fixed rod (3) is in the transverse state.

3. The pile hole depth detection device for pile construction according to claim 1, characterized in that: The connecting seat (2) is provided with the limiting plate (12) at the upper end, the limiting plate (12) is used for limiting the telescopic fixed rod (3) in the transverse horizontal state, and the limiting plate (12) is fixed on the outer surface of the device base (1).

4. The pile hole depth detection device for pile construction according to claim 1, characterized in that: The device base (1) is provided with the servo motor A (13) at one side of the end, the servo motor A (13) is provided with the driving tooth (14), the driving tooth (14) is engaged with the gear ring (15) which is installed on the outside of the driving rotary disc (7), and the driving rotary disc (7) is movably sleeved on the outside of the telescopic cylindrical rod (4).

5. The pile hole depth detection device for pile construction according to claim 1, characterized in that: The two inner walls in the inner cavity of the telescopic cylindrical rod (4) are provided with the strip-shaped guide groove (16), the depth detection rod (5) is vertically provided with the guide strip plate (17) which slides in the guide groove (16) at the position corresponding to the guide groove (16).

6. The pile hole depth detection device for pile construction according to claim 1, characterized in that: The depth detection rod (5) is vertically provided with the strip-shaped groove (18) at one side, and the strip-shaped groove (18) is installed with the strip-shaped tooth plate (19) which is engaged and driven with the gear (8).

7. The pile hole depth detection device for pile construction according to claim 1, characterized in that: The depth detection rod (5) is movably provided with the servo motor B (20) at one side of the bottom end through the bottom plate, and the rotating shaft of the servo motor B (20) is fixed with the center end of the gear (8).

8. The pile hole depth detection device for pile construction according to claim 1, characterized in that: The depth detection sensor (21) is embedded on the bottom end surface of the depth detection rod (5), the buzzer (22) is provided on one side of the end of the device base (1), and the buzzer (22) is connected with the depth detection sensor (21) through the external control box.

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