A horizontal displacement monitoring system for foundation pit retaining structure

Abstract

This application belongs to the field of construction safety monitoring technology and discloses a horizontal displacement monitoring system for foundation pit retaining structures. The system includes a first retaining structure, a second retaining structure, and a first laser distance sensor. Several reflective mechanisms are vertically spaced on the second retaining structure. Each reflective mechanism includes a mounting frame with a mounting box open on one side. A sliding block is slidably mounted inside the mounting box. A driving component is mounted on the mounting box. A mounting plate is positioned near the opening of the mounting box on the sliding block, and a lens is mounted on the mounting plate. A sealing plate is positioned on the side of the mounting plate away from the sliding block. When horizontal displacement monitoring is not required, the driving component can drive the sliding block to slide the mounting plate and lens into the mounting box, preventing dust, silt, rainwater, and other impurities generated during foundation pit construction from adhering to the lens surface. When monitoring is required, the driving component can push the lens out of the mounting box.

Description

Technical Field

[0001] This utility model relates to the field of construction safety monitoring technology, and in particular to a horizontal displacement monitoring system for foundation pit retaining structure. Background Technology

[0002] The retaining structure of an excavation pit primarily bears the water and soil pressures generated during excavation and transfers these pressures to the supporting structure. It serves as a temporary retaining wall structure for stabilizing the excavation pit. Horizontal displacement monitoring of the retaining structure refers to measuring the horizontal displacement at representative points on the retaining structure using observation instruments and equipment. This allows for understanding the normality of the retaining structure under the influence of internal and external loads and foundation deformation, providing a basis for the safe operation of the project.

[0003] Chinese utility model patent CN216206044U discloses a horizontal displacement monitoring system for a foundation pit retaining structure. The system includes a first retaining structure, a second retaining structure, and a relative displacement measuring device for measuring the horizontal displacement values ​​at various measuring points. The relative displacement measuring device includes a first laser rangefinder sensor mounted on the top sidewall of the first retaining structure and several displacement reflective mechanisms mounted vertically on the sidewall of the second retaining structure. Each displacement reflective mechanism includes a mounting plate mounted on the sidewall of the second retaining structure, an adjusting plate hinged to the mounting plate, and an adjusting mechanism for adjusting the angle between the mounting plate and the adjusting plate. The adjusting mechanism adjusts the angle between the mounting plate and the adjusting plate, enabling the displacement reflective mechanism to not only reflect light but also adjust angles.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: During the construction of the foundation pit, the adjusting plate in the above-mentioned device often generates a lot of mud, sand and dust. The mud, sand and dust easily adhere to the adjusting plate in the above-mentioned device, which reduces the reflection accuracy of the adjusting plate, affects the normal use of the adjusting plate, and requires frequent cleaning of the adjusting plate. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a horizontal displacement monitoring system for foundation pit retaining structures.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a horizontal displacement monitoring system for foundation pit retaining structure, comprising a first retaining structure and a second retaining structure. A first laser distance sensor is provided on the top side wall of the first retaining structure. A plurality of reflective mechanisms are vertically spaced on the second retaining structure. Each reflective mechanism includes a mounting frame. A mounting box with an opening on one side is provided on the mounting frame. A sliding block is slidably disposed inside the mounting box. A driving component for driving the sliding block to slide is provided on the mounting box. A mounting plate is provided on the side of the sliding block near the opening of the mounting box. A lens is provided on the mounting plate. A sealing plate is provided on the side of the mounting plate away from the sliding block.

[0007] By adopting the above technical solution, which includes a mounting frame, mounting box, and lens, when horizontal displacement monitoring is not required, the drive assembly can drive the sliding block to slide the mounting plate and lens into the mounting box. The enclosed structure of the mounting box isolates the lens from the outside environment, preventing dust, mud, rainwater, and other impurities generated during the foundation pit construction from adhering to the lens surface, thus preventing lens contamination and a decrease in laser reflection accuracy, and significantly reducing the frequency of lens cleaning and maintenance. When monitoring is required, the drive assembly can push the lens out of the mounting box, ensuring that the first laser distance sensor can receive the reflected signal and achieve accurate monitoring of the horizontal displacement of the foundation pit retaining structure.

[0008] Furthermore, the sealing plate includes a card plate connected to the mounting plate and a baffle plate disposed on the card plate, wherein the shape of the side of the card plate is consistent with the shape of the internal area of ​​the mounting box cross section.

[0009] By adopting the above technical solution, with the inclusion of a retaining plate and a baffle, when the lens is placed into the mounting box, the retaining plate can fit snugly against the inside of the mounting box, forming a sealed barrier to reduce the entry of dust and moisture from the opening of the mounting box. Simultaneously, the baffle can cover the opening of the mounting box, preventing impurities from falling into the mounting box.

[0010] Furthermore, an annular groove is provided on the plate body of the baffle near the card plate, and a sealing rubber ring is provided in the annular groove.

[0011] By adopting the above technical solution and setting a sealing rubber ring, the sealing rubber ring has good elasticity and sealing performance. When the lens is put into the mounting box and the baffle is in contact with the opening of the mounting box, the sealing rubber ring will be squeezed and deformed, tightly filling the tiny gap between the baffle and the opening of the mounting box, blocking the passage for dust, rainwater and other impurities to enter the interior of the mounting box.

[0012] Furthermore, a fixing plate is provided near the opening inside the mounting box. A strip-shaped hole is opened in the middle of the fixing plate for the mounting plate to pass through. Four sliding rods are arranged in a rectangular array between the fixing plate and the side wall of the mounting box away from the opening. A sliding hole is opened on the sliding block, and the sliding hole is slidably connected to the corresponding sliding rod.

[0013] By adopting the above technical solution, a fixed plate and a sliding rod are set up, which provide stable guidance for the sliding block to slide.

[0014] Furthermore, the drive assembly includes a fixed box disposed on the outer wall of the mounting box away from the opening. A threaded rod is rotatably disposed between the fixed plate and the outer wall of the mounting box away from the opening. The sliding block is helically connected to the threaded rod through a threaded hole. One end of the threaded rod passes through the mounting box and extends into the fixed box, where a worm gear is disposed. A worm is horizontally rotatably disposed inside the fixed box, and the worm gear cooperates with the worm gear. A drive motor is horizontally disposed on the outer wall of the fixed box, and the output shaft of the drive motor passes through the fixed box and is connected to the worm.

[0015] By adopting the above technical solution, a fixed box, a threaded rod, and a drive motor are set up. The drive motor drives the worm gear to rotate, which in turn drives the worm wheel and the threaded rod to rotate, thereby driving the sliding block to slide.

[0016] Furthermore, a protective cover is provided outside the fixing box, and the drive motor is located inside the protective cover.

[0017] By adopting the above technical solution, the drive motor can be protected by placing it inside the protective cover.

[0018] Furthermore, a C-shaped plate is provided on the outer wall of the mounting box near the opening.

[0019] By adopting the above technical solution and setting a C-shaped plate, the C-shaped plate can shield and protect the area around the opening of the mounting box, preventing dust on the surface of the mounting box from sliding down onto the lens when the lens extends out of the mounting box.

[0020] Furthermore, the mounting bracket includes a connecting plate connected to the second enclosure structure. A rotating plate is hinged to the top of the connecting plate. An adjusting rod is hinged to the side of the rotating plate adjacent to the connecting plate. Two vertical plates are provided on the side of the connecting plate adjacent to the rotating plate. The vertical plates have oblong holes. A rotating shaft is rotatably mounted on the adjusting rod. The rotating shaft slides in cooperation with one of the oblong holes. A screw hole is provided on the side of the adjusting rod away from the rotating shaft, which is concentrically arranged with the rotating shaft. A bolt is spirally installed in the screw hole.

[0021] By adopting the above technical solution, a rotating plate, an adjusting rod, and a vertical plate are set up. The overall angle of the reflective mechanism is adjusted by rotating the rotating plate, while the rotating shaft on the sliding adjusting rod slides in the oblong hole of the vertical plate. When the angle is adjusted to a suitable position, the position of the adjusting rod is fixed by tightening the bolts and using the contact between the bolts and the vertical plate, thereby locking the angle of the rotating plate.

[0022] In summary, this utility model has the following beneficial effects: In this application, a mounting frame, a mounting box, and a lens are provided. When horizontal displacement monitoring is not required, the drive assembly can drive the sliding block to slide the mounting plate and lens into the mounting box. The closed structure of the mounting box isolates the lens from the outside environment, preventing dust, mud, rainwater, and other impurities generated during the foundation pit construction from adhering to the lens surface, thus preventing lens contamination and a decrease in laser reflection accuracy, and significantly reducing the frequency of lens cleaning and maintenance. When monitoring is required, the drive assembly can push the lens out of the mounting box, ensuring that the first laser distance sensor can receive the reflected signal, achieving accurate monitoring of the horizontal displacement of the foundation pit retaining structure. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the reflective mechanism according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the reflective mechanism from another angle according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of the mounting box according to an embodiment of this utility model; Figure 5 This is a schematic diagram of the structure of the sliding block and mounting plate in an embodiment of this utility model; Figure 6 yes Figure 5 Enlarged view of part A.

[0024] In the diagram: 1. First enclosure structure; 2. Second enclosure structure; 3. First laser distance sensor; 4. Second laser rangefinder sensor; 5. Reference reflector; 6. Reflecting mechanism; 10. Mounting bracket; 11. Connecting plate; 12. Rotating plate; 13. Adjusting rod; 14. Vertical plate; 15. Waist-shaped hole; 16. Rotating shaft; 17. Bolt; 20. Mounting box; 21. Sliding block; 22. Mounting plate; 23. Lens; 24. Sealing plate; 241. Clamping plate; 242. Baffle; 243. Sealing rubber ring; 25. C-shaped plate; 30. Drive assembly; 31. Fixing box; 32. Threaded rod; 33. Worm gear; 34. Worm; 35. Drive motor; 40. Fixing plate; 41. Strip hole; 42. Sliding rod; 50. Protective cover. Detailed Implementation

[0025] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] like Figure 1-6 As shown in the figure, this application discloses a horizontal displacement monitoring system for a foundation pit retaining structure, including a first retaining structure 1 and a second retaining structure 2. A first laser distance sensor 3 is installed on the top side wall of the first retaining structure 1. Several reflective mechanisms 6 are vertically spaced on the second retaining structure 2. A second laser ranging sensor 4 and a reference reflector 5 are installed on the top of the first retaining structure 1 and on one side of the first retaining structure 1. The reference reflector 5 and the second laser ranging sensor 4 are located at the same horizontal height. The distance between the second laser ranging sensor 4 and the reference reflector 5 is measured by an absolute displacement measuring device to obtain the horizontal displacement value of the reference point, preventing the position of the reference point from shifting and causing inaccurate measurement results. Then, the distance between the first laser distance sensor 3 and the displacement reflector 6 is measured by a relative displacement measuring device to obtain the horizontal displacement value of each measuring point, thereby performing horizontal displacement monitoring of the foundation pit retaining structure (the monitoring method is prior art and will not be described in detail here).

[0027] Specifically, the reflective mechanism 6 includes a mounting frame 10, on which a mounting box 20 with an opening on one side is provided. A sliding block 21 is slidably disposed inside the mounting box 20. A driving component 30 is provided on the mounting box 20 to drive the sliding block 21 to slide. A mounting plate 22 is provided on the side of the sliding block 21 near the opening of the mounting box 20. A lens 23 is disposed on the mounting plate 22. A sealing plate 24 is provided on the side of the mounting plate 22 away from the sliding block 21. When horizontal displacement monitoring is not required, the driving component 30 can drive the sliding block 21 to slide the mounting plate 22 and the lens 23 into the mounting box 20 as a whole. The closed structure of the mounting box 20 can isolate the lens 23 from the outside world, preventing dust, mud, rainwater and other impurities generated during the foundation pit construction from adhering to the surface of the lens 23, preventing the lens 23 from becoming contaminated and causing a decrease in laser reflection accuracy, and significantly reducing the frequency of cleaning and maintenance of the lens 23. When monitoring is required, the drive assembly 30 can push the lens 23 out of the mounting box 20, ensuring that the first laser distance sensor 3 can receive the reflected signal and achieve accurate monitoring of the horizontal displacement of the foundation pit retaining structure. A C-shaped plate 25 is provided on the outer wall of the mounting box 20 near the opening. The C-shaped plate 25 can shield and protect the area around the opening of the mounting box 20, preventing dust on the surface of the mounting box 20 from sliding down onto the lens 23 when it extends out of the mounting box 20.

[0028] During installation, the mounting frame 10 includes a connecting plate 11 connected to the second enclosure structure 2. A rotating plate 12 is hinged to the top of the connecting plate 11. An adjusting rod 13 is hinged to the side of the rotating plate 12 adjacent to the connecting plate 11. Two vertical plates 14 are provided on the side of the connecting plate 11 adjacent to the rotating plate 12. The vertical plates 14 have oblong holes 15, the length direction of which is parallel to the length direction of the vertical plates 14. A rotating shaft 16 is rotatably mounted on the adjusting rod 13. The rotating shaft 16 is slidably engaged with one of the oblong holes 15. The adjusting rod 13 is moved away from the rotating plate 12. A screw hole, concentrically arranged with the rotating shaft 16, is provided on one side of the rotating shaft 16. A bolt 17 is screwed into the screw hole, and the diameter of the screw portion of the bolt 17 is smaller than the width of the oblong hole 15. The overall angle of the reflective mechanism 6 is adjusted by rotating the rotating plate 12. At the same time, the rotating shaft 16 on the sliding adjustment rod 13 slides within the oblong hole 15 of the vertical plate 14. When the angle is adjusted to the appropriate position, the bolt 17 is tightened, and the position of the adjustment rod 13 is fixed by the contact between the bolt 17 and the vertical plate 14, thereby locking the angle of the rotating plate 12. This design can adapt to different installation environments and monitoring needs, ensuring that the lens 23 can maintain optimal alignment with the first laser distance sensor 3.

[0029] In its specific configuration, the sealing plate 24 includes a retaining plate 241 connected to the mounting plate 22 and a baffle 242 disposed on the retaining plate 241. The shape of the side of the retaining plate 241 is consistent with the shape of the internal area of ​​the mounting box 20. When the lens 23 is retracted into the mounting box 20, the retaining plate 241 can fit snugly against the inside of the mounting box 20, forming a sealed barrier to reduce the entry of dust and moisture from the opening of the mounting box 20. At the same time, the baffle 242 can block the opening of the mounting box 20, preventing impurities from falling into the interior of the mounting box 20. This enhances the dustproof capability of the mounting box 20, ensuring that the lens 23 remains clean and intact for a long time, and ensuring the stability of the monitoring data. An annular groove is formed on the baffle 242 near the retaining plate 241, and a sealing rubber ring 243 is disposed in the annular groove. The sealing rubber ring 243 possesses excellent elasticity and sealing properties. When the lens 23 is retracted into the mounting box 20 and the baffle 242 is in contact with the opening of the mounting box 20, the sealing rubber ring 243 is compressed and deformed, tightly filling the tiny gap between the baffle 242 and the opening of the mounting box 20, thus blocking the entry of dust, rainwater, and other impurities into the mounting box 20. This effectively avoids lens 23 contamination caused by gaps, especially in damp or dusty construction environments, ensuring the lens 23 remains clean, guaranteeing the accuracy of laser reflection, reducing monitoring errors caused by lens 23 contamination, and improving the stability of the system's monitoring accuracy.

[0030] A fixing plate 40 is installed near the opening inside the mounting box 20. A strip-shaped hole 41 is formed in the center of the fixing plate 40 for the mounting plate 22 to pass through. Four sliding rods 42 arranged in a rectangular array are positioned between the fixing plate 40 and the side wall of the mounting box 20 away from the opening. A sliding hole is formed on the sliding block 21, and the sliding hole is slidably connected to the corresponding sliding rod 42. The fixing plate 40 and the sliding rods 42 provide stable guidance for the sliding block 21, preventing it from shifting or wobbling during sliding. This ensures that the mounting plate 22 and the lens 23 maintain a stable posture during extension or retraction, preventing positional deviation of the lens 23 due to unstable sliding, which would affect the laser reflection accuracy.

[0031] The drive assembly 30 includes a fixed box 31 disposed on the outer wall of the mounting box 20 away from the opening. A threaded rod 32 is rotatably disposed between the fixed plate 40 and the outer wall of the mounting box 20 away from the opening. The threaded rod 32 is parallel to the sliding rod 42. A sliding block 21 is helically connected to the threaded rod 32 through a threaded hole. One end of the threaded rod 32 passes through the mounting box 20 and extends into the fixed box 31, where a worm gear 33 is disposed. A worm 34 is horizontally rotatably disposed inside the fixed box 31. The worm 34 cooperates with the worm gear 33. When the worm 34 rotates, it drives the worm gear 33 and the threaded rod 32 to rotate, thereby driving the sliding block 21 to slide. A drive motor 35 is horizontally disposed on the outer wall of the fixed box 31. The output shaft of the drive motor 35 passes through the fixed box 31 and is connected to the worm 34. The drive motor 35 drives the worm 34 to rotate. The worm gear 33 and worm 34 transmission has a self-locking characteristic. When the drive motor 35 stops working, the worm gear 33 and worm 34 structure can lock the position of the threaded rod 32 by itself, preventing the sliding block 21 from sliding under the influence of external vibration and other factors. This ensures that the lens 23 can be stably maintained in the extended position when in operation, or stably stay in the mounting box 20 when in the retracted position, avoiding monitoring errors or protection failures caused by lens 23 position displacement. The worm gear 33 and worm 34 are set in the fixed box 31, which can protect the transmission components, prevent impurities from affecting the transmission accuracy, extend the service life of the drive assembly 30, and improve the overall stability, performance, and reliability of the reflector mechanism 6 drive. A protective cover 50 is set outside the fixed box 31, and the drive motor 35 is located inside the protective cover 50. Placing the drive motor 35 inside the protective cover 50 can protect the drive motor 35. A power distribution box is set next to the pit. The power distribution box contains a control device, which is electrically connected to several electrical components for processing the collected data and supplying power to the electrical components.

[0032] The operating principle of the horizontal displacement monitoring system for foundation pit retaining structure in this embodiment is as follows: In the non-monitoring state, the control device starts the drive motor 35, which drives the worm gear 34 to rotate. The worm gear 34 meshes with and drives the worm wheel 33 and the threaded rod 32 to rotate. The threaded rod 32 is screwed with the sliding block 21. Under the stable guidance of the sliding rod 42, the sliding block 21 drives the mounting plate 22 and the lens 23 to slide into the mounting box 20 until the retaining plate 241 of the sealing plate 24 is in contact with the inside of the mounting box 20 and the baffle 242 is tightly in contact with the opening of the mounting box 20 through the sealing rubber ring 243. At the same time, the worm wheel 33 and the worm gear 34 self-lock and fix the position of the sliding block 21 to prevent dust and rainwater from contaminating the lens 23. When monitoring is required, the control device starts the drive motor 35 to run in reverse, the worm 34 drives the worm wheel 33 and the threaded rod 32 to rotate in reverse, the sliding block 21 slides along the sliding rod 42 toward the opening of the mounting box 20, and pushes the lens 23 out of the slot 41 of the fixing plate 40 to the outside of the mounting box 20. The worm wheel 33 and worm 34 lock the lens 23 in place again to ensure that the lens 23 is aligned with the first laser distance sensor 3.

[0033] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A horizontal displacement monitoring system for a foundation pit retaining structure, comprising a first retaining structure (1) and a second retaining structure (2), wherein a first laser distance sensor (3) is provided on the top sidewall of the first retaining structure (1), and a plurality of reflective mechanisms (6) are vertically spaced on the second retaining structure (2), characterized in that: The reflective mechanism (6) includes a mounting frame (10), a mounting box (20) with an opening on one side is provided on the mounting frame (10), a sliding block (21) is slidably provided in the mounting box (20), a driving assembly (30) for driving the sliding block (21) to slide is provided on the mounting box (20), a mounting plate (22) is provided on the side of the sliding block (21) near the opening of the mounting box (20), a lens (23) is provided on the mounting plate (22), and a sealing plate (24) is provided on the side of the mounting plate (22) away from the sliding block (21).

2. The system for monitoring horizontal displacement of a retaining structure of a foundation pit according to claim 1, characterized in that: The sealing plate (24) includes a clamping plate (241) connected to the mounting plate (22) and a baffle (242) disposed on the clamping plate (241). The shape of the side of the clamping plate (241) is consistent with the shape of the internal area of ​​the cross section of the mounting box (20).

3. The system of claim 2, wherein the system is characterized by: The baffle (242) has an annular groove on the plate near the card plate (241), and a sealing rubber ring (243) is provided in the annular groove.

4. The system for monitoring horizontal displacement of a retaining structure of a foundation pit according to claim 1, characterized in that: A fixing plate (40) is provided near the opening inside the mounting box (20). A strip hole (41) is provided in the middle of the fixing plate (40) for the mounting plate (22) to pass through. Four sliding rods (42) arranged in a rectangular array are provided between the fixing plate (40) and the side wall of the mounting box (20) away from the opening. A sliding hole is provided on the sliding block (21), and the sliding hole is slidably connected to the corresponding sliding rod (42).

5. A system for monitoring horizontal displacement of a retaining structure of an excavation according to claim 4, wherein: The drive assembly (30) includes a fixed box (31) disposed on the outer wall of the mounting box (20) away from the opening. A threaded rod (32) is rotatably disposed between the fixed plate (40) and the outer wall of the mounting box (20) away from the opening. The sliding block (21) is helically connected to the threaded rod (32) through a threaded hole. One end of the threaded rod (32) extends through the mounting box (20) into the fixed box (31) and is provided with a worm gear (33). A worm (34) is horizontally rotatably disposed inside the fixed box (31). The worm (34) cooperates with the worm gear (33). A drive motor (35) is horizontally disposed on the outer wall of the fixed box (31). The output shaft of the drive motor (35) passes through the fixed box (31) and is connected to the worm (34).

6. The horizontal displacement monitoring system for foundation pit retaining structure according to claim 5, characterized in that: The fixed box (31) is provided with a protective cover (50), and the drive motor (35) is located inside the protective cover (50).

7. The horizontal displacement monitoring system for foundation pit retaining structure according to claim 1, characterized in that: A C-shaped plate (25) is provided on the outer wall of the mounting box (20) near the opening.

8. The horizontal displacement monitoring system for foundation pit retaining structure according to claim 1, characterized in that: The mounting bracket (10) includes a connecting plate (11) connected to the second enclosure structure (2). A rotating plate (12) is hinged to the top of the connecting plate (11). An adjusting rod (13) is hinged to the side of the rotating plate (12) near the connecting plate (11). Two vertical plates (14) are provided on the side of the connecting plate (11) near the rotating plate (12). A waist-shaped hole (15) is provided on the vertical plate (14). A rotating shaft (16) is rotatably provided on the adjusting rod (13). The rotating shaft (16) is slidably engaged with one of the waist-shaped holes (15). A screw hole is provided on the side of the adjusting rod (13) away from the rotating shaft (16) and is concentrically arranged with the rotating shaft (16). A bolt (17) is spirally provided in the screw hole.

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