A vacuum preloading foundation settlement monitoring device and method based on the principle of connected vessels

Abstract

The application is based on a vacuum preloading foundation settlement monitoring device and method based on the principle of communicating vessels: including a reference container unit arranged in a stable area outside the vacuum preloading site, each monitoring container unit arranged at each monitoring point in the vacuum preloading site, and a connecting pipeline system; the reference container unit includes a closed reference liquid storage tank for storing antifreeze liquid; each monitoring container unit includes a monitoring liquid storage tank with a pressure sensor arranged thereon; the connecting pipeline system includes a liquid passage pipe and an air passage pipe, the liquid passage pipe connects the reference liquid storage tank with the bottom of each monitoring liquid storage tank, and the air passage pipe connects the reference liquid storage tank with the top gas phase space of each monitoring liquid storage tank; a cloud processing center records the pressure sensor readings of each monitoring point before the vacuum preloading starts and after the system is stationary and stable, synchronously collects all pressure sensor readings at a set frequency after the vacuum preloading starts, and calculates and displays the cumulative settlement of the i-th monitoring point at time t based on the principle of communicating vessels.

Description

Technical Field

[0001] This invention relates to the field of monitoring technology, and in particular to a high-precision settlement monitoring device and method for vacuum preloaded foundations based on the principle of communicating vessels and using a pressure sensor for liquid level measurement. Background Technology

[0002] Vacuum preloading is an effective construction method for reinforcing soft soil foundations. During its implementation, accurate monitoring of surface settlement is crucial for evaluating the reinforcement effect, controlling the loading rate, and ensuring project safety and stability.

[0003] Currently, on-site settlement monitoring mainly employs manual leveling, which involves burying settlement markers within the site and having surveyors periodically measure the settlement using a level instrument. This method suffers from drawbacks such as high labor intensity, long measurement cycles, data dispersion, inability to provide real-time continuous monitoring, and significant susceptibility to environmental and human factors. While automated equipment such as hydrostatic levels exists, their high cost, complex installation, and limitations in applicability and reliability under the special conditions of large deformation and strong negative pressure, such as vacuum preloading, hinder large-scale application.

[0004] Therefore, there is an urgent need for a settlement monitoring technology that is low in cost, high in accuracy, stable, adaptable to vacuum negative pressure environments, and capable of automated real-time monitoring. Summary of the Invention

[0005] This invention addresses the problems and shortcomings of existing technologies by providing a novel vacuum preloading foundation settlement monitoring device and method based on the principle of communicating vessels. It utilizes pressure changes measured by pressure sensors to convert them into height changes, and through data acquisition, transmission, and processing, achieves high-precision and high-reliability automated settlement monitoring.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] The present invention provides a vacuum preloading foundation settlement monitoring device based on the principle of communicating vessels. Its features include a reference container unit set in a stable area outside the vacuum preloading site, monitoring container units set in each monitoring point in the vacuum preloading site, and a connecting pipeline system. The reference container unit is higher than the preset height of each monitoring container unit.

[0008] The reference container unit includes a sealed reference reservoir for storing antifreeze liquid.

[0009] Each of the monitoring container units includes a monitoring storage tank on which a high-precision liquid level and pressure sensor is mounted;

[0010] The connecting pipeline system includes a liquid pipe and a vent pipe. The liquid pipe connects the bottom of the reference liquid storage tank to the bottom of each monitoring liquid storage tank to form a liquid circuit. The vent pipe connects the top gas phase space of the reference liquid storage tank to the top of each monitoring liquid storage tank to form a gas circuit to balance the gas pressure inside all containers.

[0011] Each of the high-precision liquid level and pressure sensors is used to measure and monitor the static pressure generated by the liquid in the storage tank due to the liquid level in real time, and upload the data to the cloud processing center.

[0012] The cloud processing center is used to record the readings P_i0 of the high-precision liquid level and pressure sensors at each monitoring point before the vacuum pre-pressurization begins and after the system is stationary and stable. After the vacuum pre-pressurization begins, it sets a frequency to synchronously collect the readings P_it of all the high-precision liquid level and pressure sensors. Based on the principle of communicating vessels, it calculates and displays the cumulative sedimentation S_it = (P_it - P_i0) / (ρ * g) at time t for the i-th monitoring point, where ρ is the liquid density and g is the gravitational acceleration.

[0013] Preferably, the cloud processing center is used to automatically store the calculated cumulative settlement of each monitoring point and plot the settlement-time curve to intuitively display the foundation settlement process.

[0014] Preferably, the bottom of the monitoring liquid storage tank is fixed with a mounting base, and the two ends of the mounting base are fixed to the corresponding monitoring points by fixing bolts. A high-precision liquid level and pressure sensor is fixed on the monitoring liquid storage tank, and the two ends of the monitoring liquid storage tank are respectively fixed with a liquid inlet connector for connecting to a liquid inlet pipe and a vent connector for connecting to a vent pipe.

[0015] Preferably, the monitoring storage tank is also equipped with a level and an exhaust valve.

[0016] Preferably, the monitoring storage tank is also fixed with a sensor cable plug, one end of which is connected to the corresponding high-precision liquid level and pressure sensor wire, and the other end is connected to the cloud processing center wire.

[0017] This invention also provides a method for monitoring settlement of vacuum preloading foundations based on the principle of communicating vessels, characterized by comprising the following steps:

[0018] Step 1, System Deployment and Initialization: Install the reference container unit in the stable area outside the vacuum preloading site. Based on the geological survey report and monitoring plan, install each monitoring container unit at each monitoring point in the vacuum preloading site. Roll and compact the foundation at the location where the monitoring container unit is installed to ensure close contact between the monitoring chamber and the foundation soil. The reference container unit is higher than the preset height of each monitoring container unit. Connect all units into a closed system through the connecting pipeline system. Inject sufficient antifreeze into the system as the working fluid and remove air bubbles from the pipeline.

[0019] Step 2, Initial Data Calibration: Before the vacuum pre-pressurization begins and after the system has stabilized, the cloud processing center records the readings P_i0 of the high-precision liquid level and pressure sensors at each monitoring point;

[0020] Step 3: Real-time data acquisition: After the vacuum pre-pressurization begins, the cloud processing center synchronously acquires the readings P_it of all high-precision liquid level and pressure sensors according to the frequency set by the project.

[0021] Step 4: Settlement Calculation: Based on the principle of communicating vessels, the cloud processing center calculates and displays the cumulative settlement of the i-th monitoring point at time t: S_it = (P_it - P_i0) / (ρ * g), where ρ is the liquid density and g is the gravitational acceleration.

[0022] Preferably, in step five, data processing and visualization: the cloud processing center automatically stores the calculated cumulative settlement of each monitoring point and plots a settlement-time curve to intuitively display the foundation settlement process.

[0023] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0024] The positive and progressive effects of this invention are as follows:

[0025] 1) Economical and efficient: This device has a simple structure and is easy to install. One set of reference system can connect dozens of monitoring points, which greatly reduces the cost of single-point monitoring.

[0026] 2) Strong environmental adaptability: The monitoring liquid is an inert liquid that is resistant to freezing and has low evaporation, which can be used in vacuum pre-compression projects under different climatic conditions.

[0027] 3) Automation and intelligence: It has achieved 24-hour unattended monitoring, and remote data management and intelligent early warning through cloud platform, which has significantly improved the level of construction informatization. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a vacuum preloading foundation settlement monitoring device according to a preferred embodiment of the present invention.

[0029] Figure 2 This is a front view of the monitoring container unit according to a preferred embodiment of the present invention.

[0030] Figure 3 This is a side view of the monitoring container unit according to a preferred embodiment of the present invention.

[0031] Figure 4 This is a top view of the monitoring container unit according to a preferred embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figure 1-4 As shown, this embodiment provides a vacuum preloading foundation settlement monitoring device based on the principle of communicating vessels. It includes a reference container unit ① set in a stable area outside the vacuum preloading site, monitoring container units ④ set in each monitoring point in the vacuum preloading site, and a connecting pipeline system. The reference container unit ① is higher than each monitoring container unit ④ by a preset height (e.g., 30cm).

[0034] The reference container unit ① includes a sealed reference reservoir for storing antifreeze liquid.

[0035] Each monitoring container unit ④ includes a monitoring storage tank 41 on which a high-precision liquid level and pressure sensor 42 is installed.

[0036] The connecting pipeline system includes a liquid pipe ③ and a vent pipe ②. The liquid pipe ③ connects the bottom of the reference liquid storage tank to the bottom of each monitoring liquid storage tank 41 to form a liquid circuit. The vent pipe ② connects the top gas phase space of the reference liquid storage tank to the top of each monitoring liquid storage tank 41 to form a gas circuit to balance the gas pressure inside all containers.

[0037] The bottom of the monitoring liquid storage tank 41 is fixed with a mounting base 43. The two ends of the mounting base 43 are fixed to the corresponding monitoring points by fixing bolts 44. A high-precision liquid level and pressure sensor 42 is fixed on the monitoring liquid storage tank 41. The two ends of the monitoring liquid storage tank 41 are respectively fixed with a liquid inlet connector 45 connecting to the liquid inlet pipe ③ and a vent connector 46 connecting to the vent pipe ②.

[0038] The monitoring storage tank 41 is also equipped with a level 47 and an exhaust valve 48.

[0039] The monitoring storage tank 41 is also fixed with a sensor cable plug 49. One end of the sensor cable plug 49 is connected to the wire of the corresponding high-precision liquid level and pressure sensor 42, and the other end is connected to the cloud processing center through the sensor cable ⑤.

[0040] Each high-precision liquid level and pressure sensor 42 is used to measure and monitor the static pressure generated by the liquid level in the storage tank 41 in real time, and upload the data to the cloud processing center. The high-precision liquid level and pressure sensor 42 is used to directly measure the static pressure generated by the liquid level in the tank, and convert the change in pressure into the change in elevation, which is the change in the vertical displacement of each measuring point relative to the reference point, thereby accurately calculating the relative settlement of each measuring point.

[0041] The cloud processing center is used to record the readings P_i0 of the high-precision liquid level and pressure sensors 42 at each monitoring point before the vacuum pre-pressurization begins and after the system is stationary and stable. After the vacuum pre-pressurization begins, the center sets a frequency to synchronously collect the readings P_it of all the high-precision liquid level and pressure sensors. Based on the principle of communicating vessels, the center calculates and displays the cumulative sedimentation S_it = (P_it - P_i0) / (ρ * g) at time t for the i-th monitoring point, where ρ is the liquid density and g is the gravitational acceleration.

[0042] The cloud processing center is used to automatically store the calculated cumulative settlement of each monitoring point and plot the settlement-time curve to intuitively display the foundation settlement process.

[0043] This embodiment also provides a method for monitoring the settlement of vacuum preloading foundations based on the principle of communicating vessels, including the following steps:

[0044] Step 1: System Deployment and Initialization: Install the reference container unit ① in a stable area outside the vacuum preloading site. Based on the geological survey report and monitoring plan, install each monitoring container unit ④ at each monitoring point within the vacuum preloading site. Compact and tamp the foundation at the location where the monitoring container unit ④ is installed to ensure close contact between the monitoring chamber and the foundation soil. The reference container unit ① is at least 30cm higher than the preset height of each monitoring container unit ④. Connect all units into a closed system through a connecting pipeline system. Inject sufficient antifreeze as the working fluid into the system and remove air bubbles from the pipeline. Based on the principle of communicating vessels, in the initial state, the liquid levels of the main monitoring pipeline and each monitoring container unit are level. When the foundation settles, the monitoring container units descend with the foundation soil, causing the position of the monitoring container units to decrease and the internal pressure of the monitoring container units to increase.

[0045] Step 2, Initial Data Calibration: Before the vacuum pre-pressurization begins and after the system has stabilized, the cloud processing center records the readings P_i0 of the high-precision liquid level and pressure sensors 42 at each monitoring point.

[0046] Step 3: Real-time data acquisition: After the vacuum pre-pressurization begins, the cloud processing center synchronously acquires the readings P_it of all high-precision liquid level and pressure sensors 42 according to the frequency set by the project.

[0047] Step 4: Settlement Calculation: Based on the principle of communicating vessels, the cloud processing center calculates and displays the cumulative settlement of the i-th monitoring point at time t: S_it = (P_it - P_i0) / (ρ * g), where ρ is the liquid density and g is the gravitational acceleration.

[0048] According to the hydrostatic formula P = ρgh (where ρ is the liquid density, g is the gravitational acceleration, and h is the liquid level), the pressure difference is converted into sedimentation. Then, the cumulative sedimentation of the i-th monitoring point at time t is S_it = (P_it - P_i0) / (ρ * g).

[0049] Step 5: Data processing and visualization: The cloud processing center automatically stores the calculated cumulative settlement of each monitoring point and plots a settlement-time curve to intuitively display the foundation settlement process.

[0050] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A vacuum preloading foundation settlement monitoring device based on the principle of communicating vessels, characterized in that, It includes a reference container unit set in a stable area outside the vacuum preloading site, each monitoring container unit set in each monitoring point within the vacuum preloading site, and a connecting pipeline system. The reference container unit is above the preset height of each monitoring container unit. The reference container unit includes a sealed reference reservoir for storing antifreeze liquid. Each of the monitoring container units includes a monitoring storage tank on which a high-precision liquid level and pressure sensor is mounted; The connecting pipeline system includes a liquid pipe and a vent pipe. The liquid pipe connects the bottom of the reference liquid storage tank to the bottom of each monitoring liquid storage tank to form a liquid circuit. The vent pipe connects the top gas phase space of the reference liquid storage tank to the top of each monitoring liquid storage tank to form a gas circuit to balance the gas pressure inside all containers. Each of the high-precision liquid level and pressure sensors is used to measure and monitor the static pressure generated by the liquid in the storage tank due to the liquid level in real time, and upload the data to the cloud processing center. The cloud processing center is used to record the readings P_i0 of the high-precision liquid level and pressure sensors at each monitoring point before the vacuum pre-pressurization begins and after the system is stationary and stable. After the vacuum pre-pressurization begins, it sets a frequency to synchronously collect the readings P_it of all the high-precision liquid level and pressure sensors. Based on the principle of communicating vessels, it calculates and displays the cumulative sedimentation S_it = (P_it - P_i0) / (ρ * g) at time t for the i-th monitoring point, where ρ is the liquid density and g is the gravitational acceleration.

2. The vacuum preloading foundation settlement monitoring device based on the principle of communicating vessels as described in claim 1, characterized in that, The cloud processing center is used to automatically store the calculated cumulative settlement of each monitoring point and plot the settlement-time curve to intuitively display the foundation settlement process.

3. The vacuum preloading foundation settlement monitoring device based on the principle of communicating vessels as described in claim 1, characterized in that, The bottom of the monitoring liquid storage tank is fixed with a mounting base, and the two ends of the mounting base are fixed to the corresponding monitoring points by fixing bolts. A high-precision liquid level and pressure sensor is fixed on the monitoring liquid storage tank, and liquid inlet connectors for connecting liquid inlet pipes and air inlet connectors for connecting air inlet pipes are fixed to the two ends of the monitoring liquid storage tank, respectively.

4. The vacuum preloading foundation settlement monitoring device based on the principle of communicating vessels as described in claim 3, characterized in that, The monitoring storage tank is also equipped with a level and an exhaust valve.

5. The vacuum preloading foundation settlement monitoring device based on the principle of communicating vessels as described in claim 3, characterized in that, The monitoring storage tank is also equipped with a sensor cable connector. One end of the sensor cable connector is connected to the corresponding high-precision liquid level and pressure sensor wire, and the other end is connected to the cloud processing center wire.

6. A method for monitoring settlement of vacuum preloading foundation based on the principle of communicating vessels, characterized in that, Includes the following steps Step 1, System Deployment and Initialization: Install the reference container unit in the stable area outside the vacuum preloading site. Based on the geological survey report and monitoring plan, install each monitoring container unit at each monitoring point in the vacuum preloading site. Roll and compact the foundation at the location where the monitoring container unit is installed to ensure close contact between the monitoring chamber and the foundation soil. The reference container unit is higher than the preset height of each monitoring container unit. Connect all units into a closed system through the connecting pipeline system. Inject sufficient antifreeze into the system as the working fluid and remove air bubbles from the pipeline. Step 2, Initial Data Calibration: Before the vacuum pre-pressurization begins and after the system has stabilized, the cloud processing center records the readings P_i0 of the high-precision liquid level and pressure sensors at each monitoring point; Step 3: Real-time data acquisition: After the vacuum pre-pressurization begins, the cloud processing center synchronously acquires the readings P_it of all high-precision liquid level and pressure sensors according to the frequency set by the project. Step 4: Settlement Calculation: Based on the principle of communicating vessels, the cloud processing center calculates and displays the cumulative settlement of the i-th monitoring point at time t: S_it = (P_it - P_i0) / (ρ * g), where ρ is the liquid density and g is the gravitational acceleration.

7. The vacuum preloading foundation settlement monitoring method based on the principle of communicating vessels as described in claim 6, characterized in that, Step 5: Data processing and visualization: The cloud processing center automatically stores the calculated cumulative settlement of each monitoring point and plots a settlement-time curve to intuitively display the foundation settlement process.

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