Intelligent subway station deep foundation pit upheaval real-time monitoring device

Abstract

The utility model relates to an intelligent subway station deep foundation pit upheaval real-time monitoring device, and belongs to the technical field of geotechnical engineering monitoring. Comprising a foundation pit upheaval measuring tube, the outer ring of the upheaval measuring tube is sleeved with a free sliding annular plate, the free sliding annular plate can freely slide up and down along the upheaval measuring tube, a laser distance measuring sensor, a transverse plate, a laser reflecting plate and a light plate base of the laser reflecting plate are arranged in the foundation pit upheaval measuring tube, and the laser distance measuring sensor is connected with one end of a control cable; the other end of the control cable penetrates through the protection box and is connected with an encoder and reading control module, the encoder and reading control module is connected with a wireless module and is connected with a rear-end monitor through the wireless module, and the encoder and reading control module and the wireless module are powered by a battery pack. The device has the advantages of flexible and convenient signal transmission, strong environmental adaptability, high precision, simple operation, continuous and automatic monitoring, no need of on-site operation, low labor consumption and the like.

Description

Technical Field

[0001] This utility model belongs to the field of geotechnical engineering monitoring technology, and more specifically, relates to an intelligent real-time monitoring device for deep foundation pit heave in subway stations. Background Technology

[0002] With the continuous advancement of infrastructure construction in my country, the number of subway projects in major cities has increased significantly, and deep foundation pit engineering has also developed towards wider, longer, and deeper dimensions. Especially in soft soil areas, due to complex geological conditions and high groundwater levels, accidents in deep foundation pit engineering are frequent. Among these accidents, the heave phenomenon caused during foundation pit excavation is one of the main challenges faced in the design and construction phases. Therefore, effective monitoring and analysis of foundation pit heave has become a crucial link in ensuring project safety and quality.

[0003] In the field of foundation pit heave and its monitoring, scholars and engineers have conducted extensive research and proposed numerous methods. Currently, the main methods for monitoring foundation pit heave include layered vertical displacement monitoring systems and leveling systems. However, these methods require manual operation each time, resulting in high labor costs, low unit efficiency, fixed frequency, and the inability to monitor data continuously in real time. Furthermore, they suffer from high costs, complex operation, and low accuracy of monitoring results. Therefore, there is a need for a monitoring device that is simple in structure, easy to install and use, and capable of quickly, reliably, and continuously monitoring foundation pit heave in real time. Summary of the Invention

[0004] To address the shortcomings of the above technologies, the purpose of this utility model is to provide an intelligent real-time monitoring device for deep foundation pit heave in subway stations. Utilizing laser ranging technology, it employs a laser ranging sensor and a laser reflector to monitor foundation pit heave. This device is applicable to heave monitoring of various soil types, and its measurement accuracy meets the actual measurement needs of engineering projects. It is particularly suitable for projects with high accuracy requirements for monitoring the heave of the soil at the bottom of the excavated foundation pit. A freely sliding annular plate drives the laser ranging sensor to slide vertically along a strip-shaped hole. The laser reflector transmits the heave signal within the foundation pit to the encoder and reading control module, enabling intelligent real-time monitoring of the heave within the foundation pit and allowing for comparative analysis and verification of the monitoring data. This device is a real-time monitoring device with advantages such as flexible and convenient signal transmission, strong environmental adaptability, high monitoring accuracy, simple operation, good continuity and reliability, and significant application effects.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A real-time monitoring device for deep pit heave in an intelligent subway station is characterized by comprising a pit heave measuring tube (1), wherein a free-sliding annular plate (12) is fitted around the outer ring of the pit heave measuring tube (1), the free-sliding annular plate (12) can slide freely up and down along the heave measuring tube (1), and a laser ranging sensor (11), a horizontal plate (13), a laser reflector (14) and a lightweight plate base (15) are provided inside the pit heave measuring tube (1). The laser ranging sensor (11) collects the heave signal of the laser reflector (14). The laser ranging sensor (11) is connected to one end of a control cable (25), and the other end of the control cable (25) passes through a protective box (2) and is connected to an encoder and reading control module (23). The encoder and reading control module (23) is connected to a wireless module (22) and is connected to a back-end monitoring instrument through the wireless module (22). The encoder and reading control module (23) and the wireless module (22) are both powered by a battery pack (24).

[0007] Furthermore, two symmetrically arranged strip holes (16) are provided along the longitudinal extension direction of the bulge measuring tube (1), and a horizontal plate (13) is provided inside the bulge measuring tube (1) through the two strip holes (16), and the two sides of the horizontal plate (13) are fixedly connected to the freely sliding annular plate (12).

[0008] Furthermore, the free-sliding annular plate (12) is a lightweight plate material, which is sleeved on the outside of the cylindrical raised measuring tube (1). Its diameter is slightly larger than that of the raised measuring tube (1), and it can drive the horizontal plate (13) and the laser range sensor (11) to slide freely vertically along the strip hole (16).

[0009] Furthermore, the laser rangefinder (11) is symmetrically arranged at the center of the pit rise measuring tube (1) through the horizontal plate (13) at the same depth. The real-time distance between the laser rangefinder (11) and the laser reflector (14) is used to realize the real-time monitoring of the pit rise. The monitoring data is compared and verified by two identical laser rangefinders (11) and laser reflectors (14) symmetrically arranged in the pit rise measuring tube (1). The laser rangefinder (11) is fixed to the lower side of the horizontal plate (13) by the fixing nut (17). The laser reflector (14) is tightly laid on the lightweight plate base (15).

[0010] Furthermore, the pit heave measuring tube (1) is installed in the inclinometer tube (3), and multiple sections of pit heave measuring tube (1) are installed inside the inclinometer tube (3).

[0011] Furthermore, the inclinometer tube (3) is laid near the dewatering well or lattice column. The inclinometer tube (3) is reinforced during soil excavation and fixed to the dewatering well or lattice column every two meters to ensure that the inclinometer tube is not disturbed by construction and is always in a vertical state.

[0012] Furthermore, the protective box (2) is provided with an antenna (21) which is connected to the wireless module (22), and the wireless module (22) is a LORA spread spectrum communication module.

[0013] Furthermore, the protective box (2) is equipped with a battery pack (24) that supplies power to the encoder and reading control module (23) and the wireless module (22).

[0014] Furthermore, the encoder and reading control module (23) is connected to the laser rangefinder (11) via a control cable (25), and the laser rangefinder (11) transmits the bulge signal to the encoder and reading control module (23). The encoder and reading control module (23) encodes and converts the signal or data into a signal form that can be used for communication, transmission and storage.

[0015] The beneficial effects of this utility model are:

[0016] This invention utilizes laser ranging technology, employing a laser ranging sensor and a laser reflector to monitor foundation pit heave. It is applicable to heave monitoring of various soil types, and the measurement accuracy meets the needs of actual engineering measurements. It is particularly suitable for projects requiring high accuracy in monitoring heave at the bottom of excavated foundation pits. A freely sliding annular plate drives the laser ranging sensor to slide vertically along a strip-shaped hole. The laser reflector transmits the heave signal within the foundation pit to the encoder and reading control module, enabling intelligent real-time monitoring of the heave within the foundation pit and allowing for comparative analysis and verification of the monitoring data. This device is a real-time monitoring device with advantages such as flexible and convenient signal transmission, strong environmental adaptability, high monitoring accuracy, simple operation, good continuity and reliability, and significant application effects. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of an intelligent real-time monitoring device for deep foundation pit heave in subway stations provided by this utility model;

[0018] Figure 2 This is a side view of the foundation pit heave measuring tube of this utility model.

[0019] Figure 3 This is a top view schematic diagram of the foundation pit heave measuring tube of this utility model;

[0020] Explanation of the labels in the diagram: 1. Pit heave measuring tube; 2. Protective box; 3. Inclinometer tube;

[0021] 11. Laser rangefinder sensor; 12. Free-sliding ring plate; 13. Horizontal plate; 14. Laser reflector; 15. Lightweight plate base; 16. Strip hole; 17. Fixing nut; 21. Antenna; 22. Wireless module; 23. Encoder and reading control module; 24. Battery pack; 25. Control cable. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figure 1 This utility model discloses an intelligent real-time monitoring device for deep foundation pit heave in subway stations, comprising a foundation pit heave measuring tube 1. A freely sliding annular plate 12 is fitted around the outer ring of the foundation pit heave measuring tube 1, allowing the plate to slide freely up and down along the tube. Inside the foundation pit heave measuring tube 1 are a laser ranging sensor 11, a horizontal plate 13, a laser reflector 14, and a lightweight plate base 15. The laser ranging sensor 11 collects the heave signal from the laser reflector 14. One end of the laser ranging sensor 11 is connected to a control cable 25, and the other end of the control cable 25 passes through a protective box 2 and is connected to an encoder and reading control module 23. The encoder and reading control module 23 is connected to a wireless module 22 and communicates wirelessly. Module 22 is connected to the backend monitoring instrument. The encoder and reading control module 23 and the wireless module 22 are both powered by the battery pack 24. In this embodiment, laser ranging technology is used, employing a laser ranging sensor 11 and a laser reflector 14 to monitor the heave of the foundation pit. This method is applicable to the heave monitoring of various soil types, and the measurement accuracy meets the actual measurement needs of engineering projects. It is particularly suitable for engineering projects with high requirements for the accuracy of monitoring the heave of the soil at the bottom of the foundation pit. A freely sliding annular plate 12 drives the laser ranging sensor 11 to slide vertically along the strip-shaped hole 16. The laser reflector 14 transmits the heave signal within the foundation pit to the encoder and reading control module 23, enabling intelligent real-time monitoring of the heave within the foundation pit and achieving comparative analysis and verification of the monitoring data. This device is a real-time monitoring device with advantages such as flexible and convenient signal transmission, strong environmental adaptability, high monitoring accuracy, simple operation, good continuity and reliability, and significant application effects.

[0024] In this embodiment, two symmetrically arranged strip-shaped holes 16 are provided along the longitudinal extension direction of the foundation pit uplift measuring tube 1. A horizontal plate 13 is provided inside the foundation pit uplift measuring tube 1, passing through the two strip-shaped holes 16. The two sides of the horizontal plate 13 are fixedly connected to a free-sliding annular plate 12. The free-sliding annular plate 12 can slide freely along the strip-shaped holes 16 through the horizontal plate 13. The horizontal plate 13 fixes the laser ranging sensor 11 to the lower side through the fixing nut 17. The sliding of the horizontal plate 13 drives the laser ranging sensor 11 to slide vertically along the strip-shaped holes 16 together. In this embodiment, the horizontal plate 13 is used to fix the free-sliding annular plate 12, so that the free-sliding annular plate 12 can slide outside the foundation pit uplift measuring tube 1 along the strip-shaped holes 16. On the other hand, the connection of the free-sliding annular plate 12 through the horizontal plate 13 can make the two sides of the free-sliding annular plate 12 rise and fall synchronously. Since the length of the horizontal plate 13 is fixed, the free-sliding annular plate 12 will not tilt.

[0025] Reference Figure 1 As shown, this embodiment also includes a wireless module 22 and an encoder and reading control module 23. The encoder and reading control module 23 is connected to a pair of laser rangefinders 11 via a control cable 25. The laser rangefinders 11 transmit the heave signal to the encoder and reading control module 23. The laser rangefinders 11 measure the real-time distance between themselves and the laser reflector 14 to accurately monitor the heave displacement value of the soil. The encoder and reading control module 23 is connected to the wireless module 22 and is powered by a battery pack 24. The wireless module 22 is connected to the back-end monitoring instrument, enabling remote real-time continuous monitoring.

[0026] Specifically, the installation environment of the subway station deep foundation pit uplift measurement pipe 1 in this embodiment is as follows:

[0027] The pit heave measuring pipe 1 is installed in the inclinometer pipe 3. The inclinometer pipe 3 is laid near the dewatering well or lattice column. The inclinometer pipe 3 is reinforced as the soil is excavated. It is fixed to the dewatering well or lattice column every two meters to ensure that the inclinometer pipe 3 is not disturbed by construction and is always in a vertical state.

[0028] Specifically, the inclinometer tube 3 is equipped with multiple sections of foundation pit heave measurement tube 1, which can monitor the soil in different layers.

[0029] Specifically, the method of using an intelligent real-time monitoring device for deep foundation pit heave in subway stations according to this embodiment is as follows:

[0030] First, drill a hole in the foundation to be measured. After drilling to the predetermined depth, replace the grout with clean water. After replacing the grout, lift the drill to form the required measurement hole. Backfill the bottom of the measurement hole with 20-40cm thick cement mortar. Then, put the inclinometer tube with the bottom sealed into the measurement hole and insert its bottom end into the cement mortar. Several sections of foundation pit heave measurement tube 1 are installed on the inclinometer tube 3. Through multiple sections of foundation pit heave measurement tube 1, the soil in different layers can be monitored.

[0031] The inclinometer tube 3 is centrally located inside the measuring hole. Backfilling is slowly carried out into the gap between the measuring hole and the inclinometer tube 3, ensuring that there are no gaps between the backfill materials. This allows the free-sliding annular plate 12 to move up and down better with the vertical changes of the soil layer. Once the hole is filled, the soil heave during the excavation of the foundation pit can be measured. During the soil heave process, the free-sliding annular plate 12 outside the foundation pit heave measuring tube 1 rises together with the soil and drives the laser range sensor 11 to move vertically together through the horizontal plate 13. The heave signal is then transmitted to the encoder and reading control module 23 through the control cable 25. The real-time distance between the laser range sensor 11 and the laser reflector plate 14 obtained by the encoder and reading control module 23 accurately monitors the heave displacement of the soil.

[0032] Specifically, the distance between the outer circle of the free-sliding annular plate 12 and the wall of the measuring hole is greater than 2 cm.

[0033] Specifically, the control cable 25 connected to the laser rangefinder 11 is first led out and connected to the encoder and reading control module 23, and then slowly backfilled into the gap between the measuring hole and the inclinometer tube 3.

[0034] The above description, combined with the illustrations, elaborates in detail the basic principles and beneficial effects of this utility model. However, it should be noted that the above embodiments do not limit this utility model in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this utility model.

Claims

1. An intelligent real-time monitoring device for deep foundation pit heave in subway stations, characterized in that, The device includes a pit bulge measuring tube (1), with a free-sliding annular plate (12) fitted around the outer ring of the pit bulge measuring tube (1). The free-sliding annular plate (12) can slide freely up and down along the bulge measuring tube (1). Inside the pit bulge measuring tube (1) are a laser range sensor (11), a horizontal plate (13), a laser reflector (14), and a lightweight plate base (15). The laser range sensor (11) collects the bulge signal of the laser reflector (14). The laser range sensor (11) is connected to one end of a control cable (25), and the other end of the control cable (25) passes through a protective box (2) and is connected to an encoder and reading control module (23). The encoder and reading control module (23) is connected to a wireless module (22) and is connected to a back-end monitoring instrument through the wireless module (22). Both the encoder and reading control module (23) and the wireless module (22) are powered by a battery pack (24).

2. The intelligent real-time monitoring device for deep foundation pit heave in subway stations according to claim 1, characterized in that, Two symmetrically arranged strip holes (16) are provided along the longitudinal extension direction of the bulge measuring tube (1). A horizontal plate (13) is provided inside the bulge measuring tube (1) through the two strip holes (16). The two sides of the horizontal plate (13) are fixedly connected to the freely sliding annular plate (12).

3. The intelligent real-time monitoring device for deep foundation pit heave in subway stations according to claim 1, characterized in that, The free-sliding annular plate (12) is a lightweight plate material, which is wrapped around the outside of the cylindrical raised measuring tube (1). Its diameter is slightly larger than that of the raised measuring tube (1), and it can drive the horizontal plate (13) and the laser range sensor (11) to slide freely along the strip hole (16) vertically.

4. The intelligent real-time monitoring device for deep foundation pit heave in subway stations according to claim 1, characterized in that, The laser rangefinder (11) is symmetrically set at the center of the pit rise measuring tube (1) through the horizontal plate (13) at the same depth. The real-time distance between the laser rangefinder (11) and the laser reflector (14) is used to realize the real-time monitoring of pit rise. The monitoring data is compared and verified by two identical laser rangefinders (11) and laser reflectors (14) symmetrically set in the pit rise measuring tube (1). The laser rangefinder (11) is fixed to the lower side of the horizontal plate (13) by the fixing nut (17). The laser reflector (14) is tightly laid on the lightweight plate base (15).

5. The intelligent real-time monitoring device for deep foundation pit heave in subway stations according to claim 1, characterized in that, The foundation pit heave measuring tube (1) is installed in the inclinometer tube (3), and multiple sections of foundation pit heave measuring tube (1) are installed inside the inclinometer tube (3).

6. The intelligent real-time monitoring device for deep foundation pit heave in subway stations according to claim 5, characterized in that, The inclinometer tube (3) is laid near the dewatering well or lattice column. The inclinometer tube (3) is reinforced during soil excavation and fixed to the dewatering well or lattice column every two meters to ensure that the inclinometer tube is not disturbed by construction and is always in a vertical state.

7. The intelligent real-time monitoring device for deep foundation pit heave in subway stations according to claim 1, characterized in that, The protective box (2) is equipped with an antenna (21) which is connected to the wireless module (22), and the wireless module (22) is a LORA spread spectrum communication module.

8. The intelligent real-time monitoring device for deep foundation pit heave in subway stations according to claim 1, characterized in that, The protective box (2) contains a battery pack (24) that supplies power to the encoder and reading control module (23) and the wireless module (22).

9. The intelligent real-time monitoring device for deep foundation pit heave in subway stations according to claim 1, characterized in that, The encoder and reading control module (23) is connected to the laser range sensor (11) via a control cable (25). The laser range sensor (11) transmits the bulging signal to the encoder and reading control module (23). The encoder and reading control module (23) encodes and converts the signal or data into a signal form that can be used for communication, transmission and storage.

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