A complex geological subgrade uneven settlement monitoring device

Abstract

The utility model relates to roadbed monitoring technical field, and disclose a kind of complex geology roadbed uneven settlement monitoring equipment, including circular bottom warehouse, the upper portion of the circular bottom warehouse is fixedly installed with four groups of guide rods, and the side surface of four groups of guide rods is slidably installed with cooperation plate, first rotating shaft is rotatably installed in the circular bottom warehouse, and threaded rod is fixedly sleeved on the first rotating shaft, the utility model is rotated by first knob to drive second conical nut, then let first conical nut and threaded rod rotate, under the cooperation of four guide rods, cooperation plate drives angle adjusting assembly, which is installed with monitoring equipment above, to move to appropriate height, this adjustment mode has the characteristics of high precision, when adjusting to appropriate position, tighten first right-hand thread bolt and first left-hand thread bolt, first right-hand thread bolt and first left-hand thread bolt can be mutually limited, so as to inhibit the behavior of cooperation plate loosening, to ensure the stability when supporting monitoring equipment.

Description

Technical Field

[0001] This utility model relates to the field of roadbed monitoring technology, and more specifically, to a monitoring device for uneven settlement of roadbeds in complex geological conditions. Background Technology

[0002] In the construction of infrastructure such as transportation and buildings, monitoring the stability of roadbeds under complex geological conditions is crucial. Due to the uneven distribution of soil layers, significant differences in lithology, and frequent groundwater activity in complex geological areas, roadbeds are highly susceptible to uneven settlement during operation. If this settlement is not monitored and controlled in a timely manner, it can lead to pavement cracking, structural deformation, and even safety accidents, severely impacting the service life and operational safety of infrastructure. Therefore, accurate and efficient monitoring of uneven settlement in roadbeds with complex geological conditions has become a critical aspect of engineering construction and operation and maintenance.

[0003] However, existing monitoring equipment for uneven settlement of complex geological roadbeds has significant shortcomings in terms of base frame height adjustment. Traditional base frame height adjustment structures mostly use bolt fixing, which has low adjustment accuracy and makes it impossible for sensors to accurately align with monitoring points, thus affecting the accuracy of monitoring data. While simple screw adjustment methods ensure adjustment accuracy, their locking mechanisms lack stability and are prone to loosening due to long-term use or environmental factors, leading to changes in base frame height and affecting the long-term monitoring accuracy of the equipment. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a monitoring device for uneven settlement of roadbed in complex geological conditions, which has the advantages of high adjustment accuracy and long stability time.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a monitoring device for uneven settlement of complex geological roadbeds, comprising a circular base chamber, four sets of guide rods fixedly installed above the circular base chamber, limit rings fixedly installed on the top of the four sets of guide rods, mating plates slidably installed on the side surfaces of the four sets of guide rods, a through hole opened in the middle of the mating plate, a locking nut fixedly embedded in the through hole, four sets of guide holes opened on the mating plate, the guide holes cooperating with the corresponding guide rods, a first rotating shaft rotatably installed inside the circular base chamber, a threaded rod fixedly fitted on the first rotating shaft, the threaded rod being threadedly connected to the locking nut, a first bevel gear fixedly fitted on the side surface of the first rotating shaft, a first anti-slip pad ring fixedly installed on the upper surface of the first bevel gear, first right-hand bolts threadedly connected to the left and right sides of the top wall of the circular base chamber, and first left-hand bolts threadedly connected to the front and rear sides of the top wall of the circular base chamber, and first anti-slip discs fixedly installed on the lower surfaces of the first right-hand bolts and the first left-hand bolts.

[0006] As a preferred technical solution of this utility model, a first transmission shaft is rotatably mounted on the side wall of the circular bottom compartment. A second bevel gear is fixedly fitted at one end of the first transmission shaft inside the circular bottom compartment. The second bevel gear meshes with the first bevel gear. A first knob is fixedly fitted at one end of the first transmission shaft outside the circular bottom compartment.

[0007] As a preferred embodiment of this utility model, a hollow sleeve is fixedly installed on the upper surface of the mating plate, an angle adjustment component is fixedly installed on the upper surface of the hollow sleeve, and three sets of adjustable legs are installed on the side wall of the circular bottom compartment. The three sets of adjustable legs are evenly installed on the side of the circular bottom compartment.

[0008] As a preferred embodiment of this utility model, the angle adjustment component includes a hollow frustum, the lower surface of which is fixedly connected to the upper surface of a hollow sleeve. A second rotating shaft is rotatably mounted inside the hollow frustum, a third bevel gear is fixedly fitted onto the side surface of the second rotating shaft, and a circular rotating plate is fixedly mounted on the upper surface of the second rotating shaft. The circular rotating plate is rotatably connected to the hollow frustum, and a mounting bracket is fixedly mounted on the upper surface of the circular rotating plate.

[0009] As a preferred technical solution of this utility model, the left and right sides of the upper end of the circular rotating plate are threaded with second right-hand bolts, the front and rear sides of the upper end of the circular rotating plate are threaded with second left-hand bolts, the lower surfaces of the second left-hand bolts and the lower surfaces of the second right-hand bolts are fixedly installed with second anti-slip discs, and the upper surface of the third bevel gear is fixedly installed with a second anti-slip pad ring.

[0010] As a preferred embodiment of this utility model, a second transmission shaft is rotatably mounted on the side wall of the hollow truncated cone. A fourth bevel gear is fixedly fitted at one end of the second transmission shaft that extends into the hollow truncated cone. The fourth bevel gear meshes with a third bevel gear. A second button is fixedly fitted at one end of the second transmission shaft that extends out of the hollow truncated cone.

[0011] As a preferred embodiment of this utility model, the adjustable legs include two sets of limiting bolts, which are fixedly installed on the side of the circular base. An L-shaped support plate is movably fitted on the two sets of limiting bolts. The L-shaped support plate has a hollow slot that engages with the limiting bolt. The L-shaped support plate is fixedly installed on the two sets of limiting bolts by two sets of limiting nuts. Two sets of washers are movably fitted on the limiting bolts. The two sets of washers are located between the limiting bolt and the L-shaped support plate, and between the limiting bolt and the L-shaped support plate, respectively. A fixing through hole is provided on the L-shaped support plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model adjusts the height of the monitoring equipment by using a locking nut and a threaded rod. A first knob rotates the second conical nut, which in turn rotates the first conical nut and the threaded rod. With the cooperation of four sets of guide rods, the locking nut moves the mating plate to the appropriate height. This adjustment method uses a fixed-pitch thread structure to convert rotational motion into linear displacement. The displacement is clearly proportional to the number of rotations / angle, enabling quantitative control and thus high precision. After adjustment to the appropriate position, two sets of first right-hand bolts are tightened to the right, and two sets of first left-hand bolts are tightened to the left, until the first anti-slip disc is pressed against the first anti-slip pad ring, thereby locking the mating plate onto the threaded rod. When the mating plate becomes loose, it causes the first right-hand bolt (first left-hand bolt) to rotate, which in turn tightens the first left-hand bolt (first right-hand bolt), thus suppressing the loosening of the mating plate and ensuring stability when supporting the monitoring equipment.

[0013] 2. This utility model drives the fourth bevel gear to rotate by rotating the second knob, which in turn drives the third bevel gear and the second rotating shaft to rotate, thereby driving the circular rotating plate to rotate. This adjusts the angle of the monitoring equipment installed on the mounting frame, improving the monitoring accuracy. After adjustment, tighten the second right-hand bolt and the second left-hand bolt to make the second anti-slip disc press against the second anti-slip pad ring, thereby restricting the circular rotating plate.

[0014] 3. This utility model changes the installation height of the L-shaped support plate by adjusting the distance between the upper surface of the hollow groove on the L-shaped support plate and the limiting nut. Then, the L-shaped support plate is fixedly installed on the two sets of limiting nuts with two sets of limiting bolts. The gasket can increase the friction between the contact surfaces, thereby improving the connection strength. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present utility model; Figure 2 This is a schematic diagram of the threaded rod of this utility model; Figure 3 This is a schematic diagram of the internal structure of the circular bottom compartment of this utility model; Figure 4 This is a schematic diagram of the structure of the mating plate of this utility model; Figure 5 This is a schematic diagram of the angle adjustment component of this utility model; Figure 6 This is a schematic diagram of the internal structure of the hollow frustum of this utility model; Figure 7 This is a structural breakdown diagram of the adjustable legs of this utility model.

[0016] In the diagram: 1. Circular base; 2. Angle adjustment assembly; 3. Mating plate; 4. Hollow sleeve; 5. Adjustable legs; 6. Guide rod; 7. Limiting ring; 8. Threaded rod; 9. First bevel gear; 10. Second bevel gear; 11. First rotating shaft; 12. First drive shaft; 13. First knob; 14. First anti-slip pad ring; 15. First right-hand bolt; 16. First left-hand bolt; 17. First anti-slip disc; 18. Locking nut; 19. Guide hole ; 20. Hollow frustum; 21. Circular rotating plate; 22. Mounting bracket; 23. Second button; 24. Third bevel gear; 25. Fourth bevel gear; 26. Second rotating shaft; 27. Second transmission shaft; 28. Second anti-slip pad ring; 29. ​​Second right-hand bolt; 30. Second left-hand bolt; 31. Second anti-slip disc; 32. L-shaped support plate; 33. Fixing through hole; 34. Hollow groove; 35. Limit nut; 36. Limit bolt; 37. Washer. Detailed Implementation

[0017] 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.

[0018] like Figures 1 to 7 As shown, this utility model provides a monitoring device for uneven settlement of roadbed in complex geological conditions, including a circular chamber 1. Four sets of guide rods 6 are fixedly installed above the circular chamber 1. Limiting rings 7 are fixedly installed on the top of the four sets of guide rods 6. Matching plates 3 are slidably installed on the side surfaces of the four sets of guide rods 6. A through hole is opened in the middle of the matching plate 3, and a locking nut 18 is fixedly embedded in the through hole. Four sets of guide holes 19 are opened on the matching plate 3, and the guide holes 19 cooperate with the corresponding guide rods 6. A first rotating shaft 11 is rotatably installed inside the circular chamber 1. A threaded rod 8 is fixedly fitted inside a rotating shaft 11. The threaded rod 8 is threadedly connected to a locking nut 18. A first bevel gear 9 is fixedly fitted on the side surface of the first rotating shaft 11. A first anti-slip pad ring 14 is fixedly installed on the upper surface of the first bevel gear 9. A first right-hand bolt 15 is threadedly connected to the left and right sides of the top wall of the circular bottom chamber 1. A first left-hand bolt 16 is threadedly connected to the front and rear sides of the top wall of the circular bottom chamber 1. A first anti-slip disc 17 is fixedly installed on the lower surface of the first right-hand bolt 15 and the lower surface of the first left-hand bolt 16. In use, the first bevel gear 9 drives the first rotating shaft 11 and the threaded rod 8 to rotate. With the cooperation of the four sets of guide rods 6, the mating plate 3 begins to move vertically, thereby realizing the height adjustment of the monitoring equipment. This adjustment method converts the rotational motion into linear displacement through the threaded structure with a fixed pitch, which can realize quantitative control and thus has the characteristics of high precision. When it is necessary to lock the mating plate 3, tighten the two sets of first right-hand bolts 15 by turning right and tighten the two sets of first left-hand bolts 16 by turning left until the first anti-slip disc 17 is pressed against the first anti-slip pad ring 14, thereby locking the mating plate 3 onto the threaded rod 8. When the mating plate 3 loosens and drives the first right-hand bolt 15 or the first left-hand bolt 16 to rotate, the first left-hand bolt 16 or the first right-hand bolt 15 will be tightened more, thereby suppressing the loosening of the mating plate 3 and ensuring the stability when supporting the monitoring equipment. The limit ring 7 can be used to limit the height of the mating plate 3.

[0019] Among them, a first drive shaft 12 is rotatably mounted on the side wall of the circular bottom compartment 1. A second bevel gear 10 is fixedly mounted on one end of the first drive shaft 12 inside the circular bottom compartment 1. The second bevel gear 10 meshes with the first bevel gear 9. A first knob 13 is fixedly mounted on one end of the first drive shaft 12 outside the circular bottom compartment 1. In use, the first knob 13 is turned to drive the second bevel gear 10 and the first drive shaft 12 to rotate, thereby causing the first bevel gear 9 to rotate, and then the first bevel gear 9 to drive the first rotating shaft 11 and the threaded rod 8 to rotate.

[0020] Among them, a hollow sleeve 4 is fixedly installed on the upper surface of the mating plate 3, an angle adjustment component 2 is fixedly installed on the upper surface of the hollow sleeve 4, and three sets of adjustable legs 5 are installed on the side wall of the circular bottom compartment 1. The three sets of adjustable legs 5 are evenly installed on the side of the circular bottom compartment 1. In use, first adjust the installation height of the three sets of adjustable legs 5 to make the circular base 1 horizontal. When the mating plate 3 moves vertically, it will drive the angle adjustment component 2 above the hollow sleeve 4 to move up and down.

[0021] The angle adjustment component 2 includes a hollow frustum 20, the lower surface of which is fixedly connected to the upper surface of the hollow sleeve 4. A second rotating shaft 26 is rotatably installed inside the hollow frustum 20. A third bevel gear 24 is fixedly fitted on the side surface of the second rotating shaft 26. A circular rotating plate 21 is fixedly installed on the upper surface of the second rotating shaft 26. The circular rotating plate 21 is rotatably connected to the hollow frustum 20. A mounting bracket 22 is fixedly installed on the upper surface of the circular rotating plate 21. In use, when the fourth bevel gear 25 drives the third bevel gear 24 and the second rotating shaft 26 to rotate, the second rotating shaft 26 will drive the circular rotating plate 21 to rotate, thereby adjusting the angle of the monitoring equipment installed on the mounting frame 22 and improving the monitoring accuracy of the monitoring equipment.

[0022] Among them, the left and right sides of the upper end of the circular rotating plate 21 are threaded with second right-hand bolts 29, the front and rear sides of the upper end of the circular rotating plate 21 are threaded with second left-hand bolts 30, the lower surface of the second left-hand bolts 30 and the lower surface of the second right-hand bolts 29 are fixedly installed with second anti-slip discs 31, and the upper surface of the third bevel gear 24 is fixedly installed with a second anti-slip pad ring 28. When in use, to fix the circular rotating plate 21, tighten the two sets of second right-hand bolts 29 by turning right and tighten the two sets of second left-hand bolts 30 by turning left until the second anti-slip disc 31 is pressed against the second anti-slip pad ring 28, thereby locking the circular rotating plate 21. When the circular rotating plate 21 becomes loose, it will cause the second right-hand bolts 29 (second left-hand bolts 30) to rotate, and the second left-hand bolts 30 (second right-hand bolts 29) will be tightened even more, thereby inhibiting the loosening of the circular rotating plate 21 and ensuring the stability of the monitoring equipment during operation.

[0023] Among them, a second drive shaft 27 is rotatably mounted on the side wall of the hollow truncated cone 20. A fourth bevel gear 25 is fixedly fitted at one end of the second drive shaft 27 that extends into the hollow truncated cone 20. The fourth bevel gear 25 meshes with a third bevel gear 24. A second button 23 is fixedly fitted at one end of the second drive shaft 27 that extends out of the hollow truncated cone 20. In use, the second drive shaft 27 and the fourth bevel gear 25 are driven by turning the second button 23, and then the second drive shaft 27 drives the third bevel gear 24 to rotate.

[0024] The adjustable foot bracket 5 includes two sets of limiting bolts 36, which are fixedly installed on the side of the circular base 1. An L-shaped support plate 32 is movably fitted on the two sets of limiting bolts 36. A hollow slot 34 is provided on the L-shaped support plate 32, which cooperates with the limiting bolts 36. The L-shaped support plate 32 is fixedly installed on the two sets of limiting bolts 36 by two sets of limiting nuts 35. Two sets of washers 37 are movably fitted on the limiting bolts 36. The two sets of washers 37 are located between the limiting bolts 36 and the L-shaped support plate 32, and between the limiting bolts 36 and the L-shaped support plate 32, respectively. A fixing through hole 33 is provided on the L-shaped support plate 32. In use, first, place a washer 37 on each of the two sets of limiting bolts 36. Then, through the hollow slot 34 on the L-shaped support plate 32, fit the L-shaped support plate 32 onto the two sets of limiting bolts 36. Next, fit the washer 37 onto the limiting bolts 36, and then tighten the limiting nut 35 to fix the L-shaped support plate 32 onto the two sets of limiting bolts 36. Then, fix the device through the fixing through hole 33 on the L-shaped support plate 32. The installation height of the L-shaped support plate 32 can be adjusted by changing the distance between the upper surface of the hollow slot 34 and the two sets of limiting bolts 36. The two sets of washer 37 can increase the friction between the contact surfaces, thereby improving the connection strength.

[0025] The working principle and usage process of this utility model are as follows: In use, first, a washer 37 is placed on each of the two sets of limiting bolts 36. Then, through the hollow slot 34 on the L-shaped support plate 32, the L-shaped support plate 32 is fitted onto the two sets of limiting bolts 36. Next, the washer 37 is fitted onto the limiting bolts 36. Then, the limiting nut 35 is tightened to fix the L-shaped support plate 32 onto the two sets of limiting bolts 36. With the cooperation of the three sets of L-shaped support plates 32, this device is fixed in a horizontal position. The installation height of the L-shaped support plate 32 can be adjusted by changing the distance between the upper surface of the hollow slot 34 and the two sets of limiting bolts 36. The two sets of washer 37 can increase the friction between the contact surfaces, thereby improving the connection strength. The monitoring equipment is then installed on the mounting bracket 22. Rotating the first knob 13 drives the second bevel gear 10 and the first drive shaft 12 to rotate, which in turn rotates the first bevel gear 9. The first bevel gear 9 then drives the first rotating shaft 11 and the threaded rod 8 to rotate. With the cooperation of the four sets of guide rods 6, the mating plate 3 drives the hollow sleeve 4 and the angle adjustment assembly 2 to move vertically, thereby adjusting the height of the monitoring equipment. This adjustment method, through a threaded structure with a fixed pitch, converts rotational motion into linear displacement, enabling quantification. The control system provides high precision. When it is necessary to lock the mating plate 3, the two sets of first right-hand bolts 15 are tightened by turning right and the two sets of first left-hand bolts 16 are tightened by turning left until the first anti-slip disc 17 is pressed against the first anti-slip pad ring 14, thereby locking the mating plate 3 onto the threaded rod 8. When the mating plate 3 loosens and drives the first right-hand bolt 15 or the first left-hand bolt 16 to rotate, the first left-hand bolt 16 or the first right-hand bolt 15 will be tightened even more, thereby suppressing the loosening behavior of the mating plate 3 and ensuring the stability when supporting the monitoring equipment. Then, by turning the second button 23, the second drive shaft 27 and the fourth bevel gear 25 are driven to rotate. Subsequently, the second drive shaft 27 drives the third bevel gear 24 and the second rotating shaft 26 to rotate. Then, the second rotating shaft 26 drives the circular rotating plate 21 to rotate, thereby adjusting the angle of the monitoring equipment installed on the mounting bracket 22 and improving the monitoring accuracy of the monitoring equipment. When it is necessary to fix the circular rotating plate 21, tighten the two sets of second right-hand bolts 29 by turning right and tighten the two sets of second left-hand bolts 30 by turning left until the second anti-slip disc 31 is pressed against the second anti-slip pad ring 28, thereby locking the circular rotating plate 21. When the circular rotating plate 21 loosens and drives the second right-hand bolt 29 or the second left-hand bolt 30 to rotate, the second left-hand bolt 30 or the second right-hand bolt 29 will be tightened more, thereby suppressing the loosening behavior of the circular rotating plate 21 and ensuring the stability of the monitoring equipment during operation.

[0026] This design effectively improves the stability of the monitoring equipment during use and enhances the accuracy when adjusting its height.

[0027] 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.

[0028] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A monitoring device for uneven settlement of roadbed in complex geological conditions, comprising a circular bottom chamber (1), characterized in that: Four sets of guide rods (6) are fixedly installed above the circular bottom chamber (1). Limiting rings (7) are fixedly installed on the top of the four sets of guide rods (6). Matching plates (3) are slidably installed on the side surfaces of the four sets of guide rods (6). A through hole is opened in the middle of the matching plate (3), and a locking nut (18) is fixedly embedded in the through hole. Four sets of guide holes (19) are opened on the matching plate (3). The guide holes (19) cooperate with the corresponding guide rods (6). A first rotating shaft (11) is rotatably installed inside the circular bottom chamber (1). A threaded rod is fixedly fitted on the first rotating shaft (11). 8), the threaded rod (8) is threadedly connected to the locking nut (18), the first bevel gear (9) is fixedly fitted on the side surface of the first rotating shaft (11), the first anti-slip pad ring (14) is fixedly installed on the upper surface of the first bevel gear (9), the left and right sides of the top wall of the circular bottom chamber (1) are threadedly connected to the first right-hand bolt (15), the front and rear sides of the top wall of the circular bottom chamber (1) are threadedly connected to the first left-hand bolt (16), the lower surface of the first right-hand bolt (15) and the lower surface of the first left-hand bolt (16) are both fixedly installed with the first anti-slip disc (17).

2. The monitoring device for uneven settlement of roadbed in complex geological conditions according to claim 1, characterized in that: A first drive shaft (12) is rotatably mounted on the side wall of the circular bottom chamber (1). A second bevel gear (10) is fixedly fitted at one end of the first drive shaft (1) inside the circular bottom chamber (1). The second bevel gear (10) meshes with the first bevel gear (9). A first knob (13) is fixedly fitted at one end of the first drive shaft (12) outside the circular bottom chamber (1).

3. The monitoring device for uneven settlement of roadbed in complex geological conditions according to claim 1, characterized in that: A hollow sleeve (4) is fixedly installed on the upper surface of the mating plate (3), and an angle adjustment component (2) is fixedly installed on the upper surface of the hollow sleeve (4). Three sets of adjustable legs (5) are installed on the side wall of the circular bottom chamber (1), and the three sets of adjustable legs (5) are evenly installed on the side of the circular bottom chamber (1).

4. The monitoring device for uneven settlement of roadbed in complex geological conditions according to claim 3, characterized in that: The angle adjustment assembly (2) includes a hollow frustum (20), the lower surface of which is fixedly connected to the upper surface of the hollow sleeve (4), a second rotating shaft (26) is rotatably installed inside the hollow frustum (20), a third bevel gear (24) is fixedly fitted on the side surface of the second rotating shaft (26), a circular rotating plate (21) is fixedly installed on the upper surface of the second rotating shaft (26), the circular rotating plate (21) is rotatably connected to the hollow frustum (20), and a mounting bracket (22) is fixedly installed on the upper surface of the circular rotating plate (21).

5. The monitoring device for uneven settlement of roadbed in complex geological conditions according to claim 4, characterized in that: The upper left and right sides of the circular rotating plate (21) are threaded with second right-hand bolts (29), and the upper front and rear sides of the circular rotating plate (21) are threaded with second left-hand bolts (30). The lower surfaces of the second left-hand bolts (30) and the lower surfaces of the second right-hand bolts (29) are fixedly installed with second anti-slip discs (31). The upper surface of the third bevel gear (24) is fixedly installed with a second anti-slip pad ring (28).

6. The monitoring device for uneven settlement of roadbed in complex geological conditions according to claim 4, characterized in that: The hollow truncated cone (20) has a second drive shaft (27) rotatably mounted on its side wall. The end of the second drive shaft (27) that extends into the hollow truncated cone (20) is fixedly fitted with a fourth bevel gear (25). The fourth bevel gear (25) meshes with a third bevel gear (24). The end of the second drive shaft (27) that extends out of the hollow truncated cone (20) is fixedly fitted with a second button (23).

7. The monitoring device for uneven settlement of roadbed in complex geological conditions according to claim 3, characterized in that: The adjustable stand (5) includes two sets of limiting bolts (36), which are fixedly installed on the side of the circular base (1). An L-shaped support plate (32) is movably fitted on the two sets of limiting bolts (36). A hollow slot (34) is opened on the L-shaped support plate (32), which cooperates with the limiting bolt (36). The L-shaped support plate (32) is fixedly installed on the two sets of limiting bolts (36) by two sets of limiting nuts (35). Two sets of washers (37) are movably fitted on the limiting bolts (36), which are located between the limiting bolts (36) and the L-shaped support plate (32) and between the limiting bolts (36) and the L-shaped support plate (32), respectively. A fixing through hole (33) is opened on the L-shaped support plate (32).

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