Deep foundation pit slope stability on-line monitoring system

Abstract

The utility model provides a deep foundation pit slope stability on-line monitoring system which comprises a data acquisition extension set, a data acquisition switchboard, a data processor, a display terminal, a camera, a solar power supply system, an alarm sound box, a monitoring unit body, a displacement chip, a water level gauge, an anchoring body stressometer, a vibration chip and the like. The number of the monitoring unit bodies is evenly distributed at the pit bottom, the side slope and the earth surface of the deep foundation pit according to the volume range of the deep foundation pit, the monitoring unit bodies cover displacement chips and vibration chips, the displacement changes of the monitoring unit bodies can be monitored, the anchoring body stress meter monitors the stress of the side slope anchoring body, and the monitoring unit bodies are arranged in the foundation pit. The water level gauge monitors the water level at the bottom of the deep foundation pit, the system sets safety thresholds of displacement, stress and water level, when the safety thresholds are exceeded, an alarm is given, and the alarm sound box receives an alarm signal and makes a buzzing sound for reminding, so that the purpose of safe and real-time monitoring is achieved. The system has the advantages of simple observation, high automation degree, high measurement precision and fast response speed.

Description

Technical Field

[0001] The utility model relates to a safety monitoring system, in particular to an online monitoring system for the stability of a deep foundation pit slope. Background Art

[0002] With the continuous development of my country's urbanization process, high-rise buildings and underground projects have achieved rapid development, and the large-scale deep foundation pit projects that follow are also increasing. As the construction period of civil engineering projects in deep foundation pits is constantly increasing, the stability of deep foundation pit slopes is becoming more and more important during the construction period. The stability of deep foundation pit slopes is affected by many factors such as the support structure, support strength, groundwater level, external force disturbance, etc. Generally, observation base points are set at the bottom of the deep foundation pit, the overlying surface, and the key stage points of the slope. The set base points are periodically measured by theodolite and level. There is a certain hysteresis and periodicity in the measurement process. When the deep foundation pit slope has low-amplitude creep deformation, it is difficult for on-site personnel to find out whether the stability of the deep foundation pit slope is affected when it is not in the monitoring section. There is a lag in the measurement timeliness. At the same time, when the measurement data is measured and verified, there is a risk of data distortion due to human negligence, which brings unpredictable risks and hazards to the stability monitoring of the deep foundation pit slope.

[0003] A deep foundation pit is usually an excavation depth greater than or equal to 5 meters. The stability of a deep foundation pit directly affects the quality and safety of underground engineering construction, and also affects the health of construction workers. The stability of the slope of a large-volume deep foundation pit is affected by many factors. The slope support method can be selected according to the geological conditions and groundwater conditions of the deep foundation pit. Anchor spraying support, anchor rod and soil nail support are commonly used support methods. At the same time, it is also necessary to use water collection and open drainage method, jet well point method, and light well point method to reduce the discharge of groundwater to ensure that the bottom of the deep foundation pit is not disturbed by dynamic water factors.

[0004] The arrangement of deep foundation pit slope stability monitoring points should be able to reflect the actual status and changing trend of the monitored object. The monitoring points should be arranged at the key characteristic points of internal force and deformation. The selection of monitoring methods should be determined comprehensively based on factors such as deep foundation pit type, design requirements, site conditions, and methods. The basic monitoring points are monitored using theodolites and levels. Due to certain lags and uncontrollability, the existing technology needs to be further improved. Utility Model Content

[0005] In view of the above-mentioned deficiencies of the prior art, the purpose of the utility model is to provide an online monitoring system for deep foundation pit slope stability, so as to solve the problems of heavy workload, low efficiency and delayed information acquisition in the existing deep foundation pit slope stability measurement.

[0006] In order to solve the above problems, the technical solution adopted by the utility model is:

[0007] A deep foundation pit slope stability online monitoring system comprises a data acquisition extension, a data acquisition switchboard, a data processor, a display terminal, a camera, a solar power supply system, an alarm speaker, a monitoring unit, a displacement chip, a water level gauge, an anchor stress gauge, a vibration chip, etc. The number of the data acquisition extensions is determined according to the volume of the deep foundation pit. The larger the volume of the deep foundation pit, the more data acquisition extensions the system includes. Each data acquisition extension corresponds to a monitoring unit. The monitoring unit includes a displacement observation box, a chip transmitter, multiple groups of ranging chips and a vibration chip. The displacement observation box is a concrete structure with an upper opening. Each group of ranging chips is symmetrically embedded on the inner wall of the displacement observation box. The chip transmitter is located at the upper part of the displacement observation box. Each chip transmitter corresponds to a displacement chip in the displacement observation box. The data collector receives the signal sent by the chip transmitter. In order to observe the water level changes in the lower strata of the foundation pit, a borehole or a dewatering well of a certain depth is usually drilled at the bottom of the deep foundation pit, and a water level gauge with data transmission function is placed in the borehole or dewatering well. The water level gauge transmits data through a communication cable, and a suspension rope is used to fix one end of the water level gauge on the bottom plate of the deep foundation pit. The suspension rope has a scale to ensure the accuracy of the water level gauge in measuring water level changes. The stress gauge is evenly installed on the outer end side of the anchor rod or soil nail according to the length and height of the slope and the number of anchor spraying support structures, and prestress is applied. Each stress gauge has a data acquisition function, and transmits relevant data to the data processor through wireless transmission, converts the data and displays it on the display terminal, sets the stress change threshold, and when the stress change range of the anchor rod or soil nail exceeds the set safety threshold, the system generates an alarm warning, and when the displacement, stress, and water level safety threshold set by the system are exceeded, an alarm is issued. At the same time, high-definition cameras are arranged around the deep foundation pit to assist in monitoring the stability of the deep foundation pit slope. The power supply is a combination of solar energy and city electricity. In non-rainy, snowy and cloudy weather conditions, the camera, data acquisition extension, data acquisition switchboard and data processor are powered by the solar power supply system.

[0008] Preferably, the display terminal, the data processor, and the data acquisition switchboard are communicatively connected in sequence, and the data acquisition extension is communicatively connected to the data acquisition switchboard.

[0009] Preferably, the displacement observation boxes are set at the bottom of the deep foundation pit, on the surrounding slopes, on the surface outside the foundation pit and at some key locations to ensure the wide range of data collection.

[0010] Preferably, the water level meter and the anchor body stress meter are each an independent branch system, which monitors the changes in the groundwater level and the stress of the surrounding rock of the slope protection, and assists in the stability monitoring of the deep foundation pit.

[0011] Preferably, it also includes a WiFi network, and the camera and the alarm speaker can perform remote image viewing and remote alarm voice broadcasting through the WiFi network.

[0012] Preferably, dual power supplies are used, with AC power used in rainy weather and a solar power supply system used in non-rainy weather to ensure system energy saving and reliability.

[0013] Preferably, the data processor sets the displacement, water level and stress system safety thresholds. When the monitoring unit detects that the value exceeds the set threshold, the system generates an alarm reminder, the alarm speaker receives the alarm signal and broadcasts it by voice, and the camera can be called to focus on monitoring the exceeded area and take measures.

[0014] Preferably, the displacement chip, water level gauge, anchor body stress gauge and vibration chip adopt high-precision sensors, which have high sensitivity and ensure the accuracy of monitoring data.

[0015] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the process of an online monitoring system for the stability of a deep foundation pit slope of the utility model;

[0017] Figure 2 The utility model is a schematic diagram of the plane layout of an online monitoring system for the stability of a deep foundation pit slope.

[0018] In the figure: 1-displacement chip, 2-vibration chip, 3-anchor stress gauge, 4-water level gauge, 5-data acquisition extension; 6-data acquisition switchboard, 7-data processor, 8-display terminal, 9-camera, 10-solar panel, 11-monitoring unit, 12-alarm speaker, DETAILED DESCRIPTION

[0019] The utility model is described in detail below with reference to the accompanying drawings:

[0020] Combination Figure 1 and Figure 2An online monitoring system for the stability of a deep foundation pit slope comprises a displacement chip 1, a vibration chip 2, an anchor stress gauge 3, a water level gauge 4, a data acquisition extension 5, a data acquisition switchboard 6, a data processor 7, a display terminal 8, a camera 9, a solar panel 10, a monitoring unit 11 and an alarm speaker 12. The display terminal 8, the data processor 7 and the data acquisition switchboard 6 are sequentially connected in communication. The monitoring unit 11 contains multiple groups of displacement chips 1 and vibration chips 2. The monitoring unit 11 includes a displacement observation box 111, a chip transmitter 112, multiple groups of displacement chips 1, and vibration chips 2. The displacement observation box 111 is a concrete structure with an upper opening. Each group of displacement chips 1 is symmetrically embedded on the inner wall of the displacement observation box 111. The chip transmitter 112 is located at the upper part of the displacement observation box 111. Each chip transmitter 112 corresponds to the displacement chip 1 in the displacement observation box. The displacement chips 1 are arranged in pairs to monitor the changes in the relative positions of the displacement chips 1. The data acquisition extension 5 receives the signal sent by the chip transmitter 112. The number of monitoring units 11 is evenly set according to the size of the deep foundation pit. The monitoring unit 11 is arranged at the bottom of the deep foundation pit, the surrounding slopes, the outside of the ground foundation pit, etc. The vibration chip 2 collects the impact of vibration on the deep foundation pit slope protection under external vibration sources.

[0021] In order to monitor the changes in groundwater level and its impact on the stability of deep foundation pits, a borehole or precipitation well of a certain depth is usually drilled at the bottom of the deep foundation pit, and a water level meter 4 with data transmission function is placed in the borehole or precipitation well. The water level meter 4 transmits data through a communication cable, and a suspension rope is used to fix one end of the water level meter 4 to the bottom plate of the deep foundation pit to ensure the accuracy of the water level meter 4 in measuring water level changes. The anchor stress gauges 3 are evenly arranged on the outer end sides of the anchor rods or soil nails according to the length and height of the slope and the number of anchor-sprayed support structures to monitor the changes in the anchor stress. The arranged anchor stress gauges 3 are numbered and named in the order of rows and columns. Each anchor stress gauge 3 has a stress collection function. The data of multiple groups of anchor stress gauges 3 are transmitted to the data collection extension 5 through wireless signals. There are multiple data collection extensions 5. The data collection extensions 5 transmit the relevant data to the data collection switchboard 6 through wireless transmission. The data collection switchboard 6 transmits the signal to the data processor 7. The data processor 7 converts the data information and displays it on the display terminal 8. A stress safety threshold is set. When the stress change range of the anchor rod or soil nail exceeds the safety threshold, the system generates an alarm warning.

[0022] An online monitoring system for the stability of a deep foundation pit slope also includes a WiFi network, and a data acquisition switchboard 6, a data acquisition extension 5, and a data processor 7 are connected to each other through the WiFi network. The data processor 7 makes judgments based on the limit values ​​of displacement, vibration frequency, stress, and liquid level. If the displacement, vibration frequency, stress, or liquid level exceeds the safety threshold, an alarm is generated on the display terminal 8, and the alarm signal is sent to the alarm speaker 12. The signal receiver of the alarm speaker 12 is activated and emits a "beep" to warn. While emitting a "beep", the alarm speaker 12 transmits the signal to the camera 9 around the data exceeding the safety threshold. Multiple cameras 9 can be arranged according to the size of the deep foundation pit area. The camera 9 sends the on-site picture to the administrator's mobile phone through the WiFi network and issues a reminder, which is conducive to alarm reminders when personnel are not present or at night.

[0023] The system is powered by AC power and solar panels. In rainy, snowy and cloudy weather, AC power is used, while in other cases, solar panels can be used to supply power, ensuring the reliability and energy saving of the system power supply.

[0024] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples.

[0025] Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. An online monitoring system for the stability of a deep foundation pit slope, comprising a data acquisition extension, a data acquisition switchboard, a data processor, a display terminal, a camera, a solar power supply system, an alarm speaker, a monitoring unit, a displacement chip, a water level gauge, an anchor stress gauge, and a vibration chip, characterized in that: The number of monitoring units is evenly distributed on the bottom, slope and surface of the deep foundation pit according to the volume range of the deep foundation pit. The monitoring unit contains displacement chips and vibration chips, which can monitor the displacement changes of the monitoring unit. The anchor stress gauge monitors the stress of the slope anchor, and the water level gauge monitors the water level at the bottom of the deep foundation pit. The data acquisition switchboard collects data and processes it through the data processor. When the displacement, stress and water level safety thresholds set by the system are exceeded, an alarm is issued. The alarm speaker receives the alarm signal and emits a "buzzer" to remind.

2. The deep foundation pit slope stability online monitoring system according to claim 1 is characterized in that: The display terminal, the data processor and the data acquisition switchboard are connected in communication in sequence, and the monitoring unit body is connected in communication with the data acquisition extension.

3. The deep foundation pit slope stability online monitoring system according to claim 1 is characterized in that: The power supply is provided by a combination of solar energy and city electricity, and solar energy is used for power supply in non-rainy weather conditions.

4. The deep foundation pit slope stability online monitoring system according to claim 1 is characterized in that: The displacement chips are arranged in pairs to monitor changes in relative displacement.

5. The deep foundation pit slope stability online monitoring system according to claim 1 is characterized in that: The camera has infrared function to meet the needs of night monitoring.

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