Foundation pit monitoring sensing mechanism

Abstract

The utility model discloses a foundation pit monitoring sensing mechanism, which relates to the technical field of foundation pit monitoring and comprises a mounting block, a mounting seat is fixed at the lower end of the mounting block, a fixed arm with a channel in the middle is fixed on one side of the mounting block, and a movable arm is slidably connected in the fixed arm. According to the utility model, the displacement sensor and the spring are arranged in the fixed arm and the sliding sleeve is arranged, so that a gap between the bearing plate and the fixed arm can be covered, and external sundries are prevented from entering the gap between the fixed arm and the bearing plate; according to the invention, external sundries are prevented from hindering the movement of the bearing plate, smooth movement of the bearing plate is ensured, the accuracy of a monitoring result is ensured, the danger of foundation pit construction caused by incapability of accurately obtaining the deformation condition of the foundation pit is avoided, in addition, the external sundries can be prevented from polluting and eroding the displacement sensor, and the service life of the displacement sensor is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit monitoring technology, and in particular to a foundation pit monitoring sensing mechanism. Background Technology

[0002] Excavation of foundation pits is frequently required in construction projects. During or after excavation, the surrounding soil exerts pressure on the pit, easily causing deformation. This necessitates adjustments or re-excavation, increasing workload, extending construction time, and potentially leading to accidents. Therefore, monitoring foundation pit deformation is crucial during construction to mitigate losses. Current technology for monitoring foundation pit deformation relies on periodic observations using total stations and levels, which cannot provide continuous monitoring and may result in delayed responses.

[0003] To address the aforementioned issues, patent document CN212200516U discloses a building foundation pit deformation monitoring device, comprising a positioning mechanism and a monitoring mechanism. The monitoring mechanism includes a monitoring housing, a fixed arm, a sliding arm, a pressure plate, a displacement sensor, and an alarm. This device uses a pressure plate in close contact with the sidewall of the foundation pit. When the sidewall deforms under the pressure of the surrounding soil, the pressure plate is pushed against the monitoring housing. The pull rod of the displacement sensor is displaced by the pressure plate, generating an electrical signal that triggers the alarm. The monitoring mechanism and positioning mechanism are detachable, facilitating installation at monitoring points. Furthermore, the device is less susceptible to tilting or other damage caused by soil changes, thus enabling real-time monitoring of foundation pit deformation, timely detection of deformation, and saving labor costs.

[0004] Based on the above search and combined with existing technology, it was found that there is a certain gap between the moving end and the fixed end of the existing foundation pit monitoring sensor mechanism, which is exposed to the external environment. Meanwhile, some mud, small stones and other debris are easily generated inside the foundation pit. If they fall into the gap, they can restrict the movement of the moving end, affect the monitoring results, and make it impossible to accurately know the deformation status of the foundation pit, which brings danger to the foundation pit construction. Therefore, a foundation pit monitoring sensor mechanism is needed. Utility Model Content

[0005] The purpose of this application is to provide a foundation pit monitoring sensing mechanism to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a foundation pit monitoring sensing mechanism, including a mounting block, a mounting base fixed at the lower end of the mounting block, a fixed arm with a channel in the middle fixed on one side of the mounting block, a movable arm slidably connected inside the fixed arm, and one end of the movable arm located inside the fixed arm being elastically connected to the side wall of the mounting block by a spring.

[0007] The other end of the movable arm extends to the outside of the fixed arm and is fixed with a pressure plate, which abuts against the side wall of the pit.

[0008] A displacement sensor is also fixed on the mounting block, and the movable end of the displacement sensor is fixed to one end of the movable arm.

[0009] As a further supplement to this solution, a sliding sleeve is fixed on the side of the pressure plate near the mounting block. The sliding sleeve is clearance-fitted with the movable arm. The sliding sleeve is slidably mounted on the outside of the fixed arm, and the inner diameter of the sliding sleeve is adapted to the outer diameter of the fixed arm.

[0010] As a further supplement to this solution, a mud-shoveling inclined wall is formed on the side end of the sliding sleeve near the mounting block, and the mud-shoveling inclined wall is inclined to the outside away from the central axis of the sliding sleeve.

[0011] As a further supplement to this solution, the length of the sliding sleeve is greater than the travel of the movable arm within the fixed arm, the wall thickness of the sliding sleeve is less than 1cm, and the inclination angle of the shovel wall is in the range of 24°-45°.

[0012] As a further supplement to this solution, the displacement sensor is fixedly embedded in the mounting block, the movable end of the displacement sensor extends into the fixed arm and is fixed to one end of the movable arm, and the spring is movably sleeved on the outside of the movable end of the displacement sensor.

[0013] As a further supplement to this solution, a distance measuring sensor is fixedly embedded at the front end of the pressure plate, and the measuring end of the distance measuring sensor is exposed outside the pressure plate and fits against the side wall of the pit.

[0014] As a further supplement to this solution, the bearing plate is integrally formed with multiple outwardly extending arm plates. The ends of the extending arm plates are also fixedly embedded with distance measuring sensors. The measuring ends of the distance measuring sensors are exposed outside the bearing plate and are attached to the side wall of the pit.

[0015] As a further supplement to this solution, the lower ends of the fixed arm and the sliding sleeve are provided with balance air holes. Multiple balance air holes are provided and are evenly distributed along the extension direction of the fixed arm and the sliding sleeve. Filter screens are fixedly embedded in each of the multiple balance air holes.

[0016] As a further supplement to this solution, a through hole with an inner diameter smaller than that of the fixed arm channel is formed at the end of the fixed arm away from the mounting block. The diameter of the movable arm is consistent with the inner diameter of the through hole of the fixed arm. A limit end plate is formed at the end of the movable arm close to the mounting block. One side of the limit end plate is fixed to one end of the spring. The diameter of the limit end plate is consistent with the diameter of the fixed arm channel.

[0017] In summary, the technical effects and advantages of this utility model are as follows:

[0018] This invention, by placing the displacement sensor and spring inside the fixed arm, prevents mud, small stones, or other debris from clogging the space between the pressure plate and the fixed arm end. This allows the pressure plate to move more smoothly under the pressure of the pit sidewall, avoiding interference with monitoring results and preventing the dangers of inaccurate pit deformation during construction. The sliding sleeve covers the gap between the pressure plate and the fixed arm, directly preventing external debris from entering this gap and further ensuring smooth movement and accurate monitoring results. The shovel-like inclined wall removes external debris adhering to the fixed arm between the sliding sleeve end and the mounting block during sliding, preventing it from affecting the sliding sleeve and further ensuring smooth movement of the pressure plate. By extending the arm plate and setting up multiple distance sensors, the contact area between the bearing plate and the pit sidewall can be expanded, enabling the pit monitoring sensing mechanism to monitor the deformation of the pit sidewall over a larger range. On the other hand, the multiple distance sensors can measure the distance between the bearing plate and the ends of the multiple extension arm plates and the base sidewall in real time, thereby obtaining the deformation direction and magnitude of the pit sidewall. When used in conjunction with displacement sensors, more accurate deformation monitoring data of the pit sidewall can be obtained, thus providing stronger practical support for subsequent pit construction or treatment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure in this embodiment;

[0020] Figure 2 This is a schematic cross-sectional view of the structure in this embodiment;

[0021] Figure 3 for Figure 2 Enlarged view of the structure at point A in the image;

[0022] Figure 4 for Figure 2 Enlarged view of the structure at point B in the image;

[0023] Explanation of icon numbers:

[0024] 1. Mounting block; 2. Mounting base; 3. Fixed arm; 4. Movable arm; 401. Limiting end plate; 5. Pressure plate; 501. Extension arm plate; 6. Distance sensor; 7. Sliding sleeve; 701. Mud scraper wall; 8. Displacement sensor; 9. Spring; 10. Balancing air hole; 11. Filter screen. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0026] like Figures 1-4 As shown, the present invention provides a foundation pit monitoring sensing mechanism, including a mounting block 1, a mounting base 2 fixed at the lower end of the mounting block 1, a fixed arm 3 with a channel in the middle fixed on one side of the mounting block 1, a movable arm 4 slidably connected inside the fixed arm 3, and one end of the movable arm 4 located inside the fixed arm 3 being elastically connected to the side wall of the mounting block 1 by a spring 9.

[0027] Specifically, the end of the fixed arm 3 away from the mounting block 1 forms a through hole with an inner diameter smaller than the inner diameter of the channel of the fixed arm 3. The diameter of the movable arm 4 is the same as the inner diameter of the through hole of the fixed arm 3. The end of the movable arm 4 close to the mounting block 1 forms a limit plate 401. One side of the limit plate 401 is fixed to one end of the spring 9. The diameter of the limit plate 401 is the same as the diameter of the channel of the fixed arm 3.

[0028] The other end of the movable arm 4 extends to the outside of the fixed arm 3 and is fixed with a pressure plate 5, which abuts against the side wall of the pit.

[0029] A displacement sensor 8 is also fixed on the mounting block 1. The displacement sensor 8 is fixedly embedded in the mounting block 1. The movable end of the displacement sensor 8 extends into the fixed arm 3 and is fixed to one end of the movable arm 4. The spring 9 is movably sleeved on the outside of the movable end of the displacement sensor 8.

[0030] Based on the above structure, by placing both the displacement sensor 8 and the spring 9 inside the fixed arm 3, it is possible to prevent mud or small stones and other debris from blocking the pressure plate 5 and the end of the fixed arm 3. This allows the pressure plate 5 to move more smoothly when squeezed by the side wall of the foundation pit, avoiding affecting the monitoring results and thus avoiding the danger to foundation pit construction caused by the inability to accurately know the deformation status of the foundation pit.

[0031] Furthermore, a sliding sleeve 7 is fixed on the side of the pressure plate 5 near the mounting block 1. The sliding sleeve 7 is in clearance fit with the movable arm 4. The sliding sleeve 7 is slidably sleeved on the outside of the fixed arm 3. The inner diameter of the sliding sleeve 7 is the same as the outer diameter of the fixed arm 3. By setting the sliding sleeve 7, the gap between the pressure plate 5 and the fixed arm 3 can be covered, thereby directly preventing external debris (referring to the aforementioned mud or small stones, etc.) from entering the gap between the fixed arm 3 and the pressure plate 5. This more thoroughly prevents external debris from hindering the movement of the pressure plate 5, ensuring its smooth movement and the accuracy of the monitoring results.

[0032] The sliding sleeve 7 has a mud-shoveling inclined wall 701 formed on one end near the mounting block 1. The mud-shoveling inclined wall 701 is inclined to the outside away from the central axis of the sliding sleeve 7. The length of the sliding sleeve 7 is greater than the travel of the movable arm 4 in the fixed arm 3. The wall thickness of the sliding sleeve 7 is less than 1 cm. The inclination angle of the mud-shoveling inclined wall 701 is in the range of 24°-45°. In this embodiment, the inclination angle of the mud-shoveling inclined wall 701 is 38°.

[0033] By setting the shovel wall 701, external debris attached to the outside of the fixed arm 3 between the end of the sliding sleeve 7 and the mounting block 1 can be removed when the sliding sleeve 7 is in motion, thereby preventing the external debris attached to the fixed arm 3 from affecting the sliding of the sliding sleeve 7 and further ensuring the smooth movement of the pressure plate 5.

[0034] Furthermore, a distance sensor 6 is fixedly embedded at the front end of the pressure plate 5, and the measuring end of the distance sensor 6 is exposed outside the pressure plate 5 and fits against the side wall of the pit.

[0035] The bearing plate 5 has multiple outwardly extending arm plates 501 integrally formed around its perimeter. The ends of the extension arm plates 501 are also fixedly embedded with distance measuring sensors 6. The measuring ends of the distance measuring sensors 6 are exposed outside the bearing plate 5 and are attached to the side wall of the pit.

[0036] By using the extension arm plate 501 and multiple distance sensors 6, the contact area between the bearing plate 5 and the pit sidewall can be expanded, enabling the pit monitoring sensing mechanism to monitor the deformation of the pit sidewall over a wider range. On the other hand, the multiple distance sensors 6 can measure the distance between the bearing plate 5 and the ends of the multiple extension arm plates 501 and the base sidewall in real time, thereby obtaining the deformation direction and magnitude of the pit sidewall. When used in conjunction with the displacement sensor 8, more accurate deformation monitoring data of the pit sidewall can be obtained, thus providing stronger practical support for subsequent pit construction or treatment.

[0037] Furthermore, both the fixed arm 3 and the sliding sleeve 7 have balance air holes 10 at their lower ends. Multiple balance air holes 10 are provided and are evenly distributed along the extension direction of the fixed arm 3 and the sliding sleeve 7. Filter screens 11 are fixedly embedded in each of the multiple balance air holes 10.

[0038] By setting the balance vent 10, when the movable arm 4 and the sliding sleeve 7 move synchronously, the air in the sliding sleeve 7 and the air in the fixed arm 3 are squeezed and can be discharged through the balance vent 10, thereby ensuring that the pressure plate 5 moves more smoothly and avoiding obstruction to the movement of the pressure plate 5. At the same time, the filter screen 11 can prevent external debris from entering the fixed arm 3 and the sliding sleeve 7 through the balance vent 10, ensuring the cleanliness of the interior.

[0039] The working principle of this utility model is as follows: In daily use, the pit monitoring sensor mechanism is first installed at the test position of the pit through the mounting base 2, and the pressure plate 5 is placed against the side wall of the pit. The spring 9 is kept in the extended state. When the side wall of the pit deforms, it squeezes the pressure plate 5, causing the pressure plate 5 to move closer to the mounting block 1. At the same time, it drives the movable arm 4 and the sliding sleeve 7 to move synchronously. At this time, the movable arm 4 squeezes the movable end of the displacement sensor 8, so that the displacement sensor 8 can know the moving distance of the pressure plate 5. Meanwhile, multiple distance sensors 6 can measure the distance between the pressure plate 5 and the ends of multiple extension arm plates 501 and the base side wall in real time, so as to know the deformation direction and deformation magnitude of the pit side wall. When used with the displacement sensor 8, more accurate deformation monitoring data of the pit side wall can be obtained, thus providing more powerful practical support for subsequent pit construction or treatment.

[0040] During this process, since both the displacement sensor 8 and the spring 9 are placed inside the fixed arm 3 and a sliding sleeve 7 is provided, the gap between the pressure plate 5 and the fixed arm 3 can be covered, preventing external debris from entering the gap between the fixed arm 3 and the pressure plate 5. This prevents external debris from hindering the movement of the pressure plate 5, ensuring its smooth movement and the accuracy of the monitoring results. This avoids the danger to the foundation pit construction caused by the inability to accurately know the deformation status of the foundation pit. In addition, it can also prevent external debris from contaminating and corroding the displacement sensor 8, extending the service life of the displacement sensor 8.

[0041] This utility model has been described with reference to the above-described embodiments and accompanying drawings. However, the above embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. On the contrary, modifications and equivalent provisions included in the spirit and scope of the claims are all included within the scope of this utility model.

Claims

1. A foundation pit monitoring sensing mechanism, comprising a mounting block, wherein a mounting base is fixed to the lower end of the mounting block, characterized in that: A fixed arm with a channel in the middle is fixed on one side of the mounting block. A movable arm is slidably connected inside the fixed arm. One end of the movable arm located inside the fixed arm is elastically connected to the side wall of the mounting block by a spring. The other end of the movable arm extends to the outside of the fixed arm and is fixed with a pressure plate, which abuts against the side wall of the pit. A displacement sensor is also fixed on the mounting block, and the movable end of the displacement sensor is fixed to one end of the movable arm.

2. The foundation pit monitoring sensing mechanism according to claim 1, characterized in that: A sliding sleeve is fixed to the side of the pressure plate near the mounting block. The sliding sleeve is in clearance fit with the movable arm. The sliding sleeve is slidably mounted on the outside of the fixed arm. The inner diameter of the sliding sleeve is adapted to the outer diameter of the fixed arm.

3. The foundation pit monitoring sensing mechanism according to claim 2, characterized in that: The sliding sleeve has a mud-shoveling inclined wall formed on one end near the mounting block, and the mud-shoveling inclined wall is inclined to the outside away from the central axis of the sliding sleeve.

4. The foundation pit monitoring sensing mechanism according to claim 3, characterized in that: The length of the sliding sleeve is greater than the travel distance of the movable arm within the fixed arm, the wall thickness of the sliding sleeve is less than 1 cm, and the inclination angle of the shovel wall is in the range of 24°-45°.

5. The foundation pit monitoring sensing mechanism according to claim 1, characterized in that: The displacement sensor is fixedly embedded in the mounting block, and the movable end of the displacement sensor extends into the fixed arm and is fixed to one end of the movable arm. The spring is movably sleeved on the outside of the movable end of the displacement sensor.

6. The foundation pit monitoring sensing mechanism according to claim 1, characterized in that: A distance measuring sensor is fixedly embedded at the front end of the pressure plate, and the measuring end of the distance measuring sensor is exposed outside the pressure plate and is attached to the side wall of the pit.

7. The foundation pit monitoring sensing mechanism according to claim 6, characterized in that: The pressure plate has multiple outwardly extending arm plates integrally formed around its periphery. The ends of the extending arm plates are also fixedly embedded with distance measuring sensors. The measuring ends of the distance measuring sensors are exposed outside the pressure plate and are attached to the side wall of the pit.

8. The foundation pit monitoring sensing mechanism according to claim 1, characterized in that: The fixed arm and the lower end of the sliding sleeve are provided with balance air holes. Multiple balance air holes are provided and are evenly distributed along the extension direction of the fixed arm and the sliding sleeve. A filter screen is fixedly embedded in each of the multiple balance air holes.

9. The foundation pit monitoring sensing mechanism according to claim 1, characterized in that: The fixed arm has a through hole with an inner diameter smaller than that of the fixed arm channel at the end away from the mounting block. The movable arm has the same diameter as the through hole of the fixed arm. The movable arm has a limit plate at the end close to the mounting block. One side of the limit plate is fixed to one end of the spring. The diameter of the limit plate is the same as that of the fixed arm channel.

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