Open caisson real-time attitude monitoring system and method based on hydraulic communication principle

Abstract

The invention discloses an open caisson real-time posture monitoring system and method based on the hydraulic communication principle, and belongs to the field of open caisson posture monitoring. The open caisson real-time posture monitoring system based on the hydraulic communication principle comprises an open caisson body, and open caisson inner sensors located at the same height are arranged in the open caisson body; an earth surface reference sensor, a liquid storage tank and data recording and processing equipment are arranged on the open caisson body, the open caisson inner sensors are used for collecting water pressure data of the same height in the open caisson, and the liquid storage tank communicates with the earth surface reference sensor and the open caisson inner sensors through liquid transmission pipelines. And the earth surface reference sensor and the in-open caisson sensor are connected with the data recording and processing equipment through data lines. According to the open caisson real-time attitude monitoring system and method based on the hydraulic communication principle, the problems that in the prior art, precision is low, arrangement is complex, the anti-interference capacity is weak, maintenance is difficult, and manual guarding is needed can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of caisson posture monitoring, and particularly to a caisson real-time posture monitoring system and method based on a hydraulic communication principle. BACKGROUND

[0002] As an important foundation type of large bridges, tunnels and deep foundation structures, the precise monitoring of the sinking and tilting process of a caisson is crucial to construction safety and structural stability. Traditional displacement and tilt monitoring relies on total stations, levels, laser range finders or high-precision attitude sensors, which have problems such as frequent manual reading, data susceptible to interference, complex on-site layout and low automation level.

[0003] In recent years, the principle of communicating vessels has been used to a small extent for the overall deformation monitoring of hydraulic structures. However, there is still a lack of new monitoring technology for the real-time posture and sinking quantity of large-scale caissons in complex environments, which is unmanned, resistant to environmental interference, high-precision and easy to maintain. SUMMARY

[0004] The purpose of the present application is to provide a caisson real-time posture monitoring system and method based on a hydraulic communication principle, which solves the problems of low precision, complex layout, weak anti-interference ability, difficult maintenance and the need for manual monitoring of traditional technology by arranging pressure sensors inside the caisson and constructing a closed liquid network, and calculating the sinking height and inclination of the caisson using the principle of communicating vessels.

[0005] To achieve the above purpose, the present application provides a caisson real-time posture monitoring system based on a hydraulic communication principle, which comprises a caisson main body, a caisson internal sensor located at the same height inside the caisson main body, a ground reference sensor, a liquid storage tank and a data recording and processing device arranged on the caisson main body, the caisson internal sensor is used to collect water pressure data at the same height inside the caisson, the liquid storage tank is connected to the ground reference sensor and the caisson internal sensor through a liquid transmission pipeline, and the ground reference sensor and the caisson internal sensor are connected to the data recording and processing device through a data line.

[0006] Preferably, four caisson internal sensors are arranged, and the four caisson internal sensors are installed on the caisson wall at the same height inside the caisson main body and located at the four quarter points of the inscribed circle inside the caisson main body. The caisson internal sensor is installed in a container with an IP68 protection level and is equipped with an exhaust valve.

[0007] Preferably, the liquid storage tank and the data recording and processing device are arranged in a control room on the ground.

[0008] Preferably, the liquid storage tank is equipped with a vacuum degassing device.

[0009] Preferably, the liquid transmission pipeline is a sealed steel wire reinforced hose, and a protective sleeve is fitted over the sealed steel wire reinforced hose. The liquid transmission pipeline is laid along the well wall.

[0010] This invention also provides a method for real-time attitude monitoring of a caisson based on the principle of hydraulic connection, comprising the following steps: Step S1, Install sensors: Place four high-precision pressure sensors at the quarter points of the inscribed circle at the same height inside the caisson as sensors inside the caisson, and install one high-precision pressure sensor on the ground surface as a reference sensor on the ground surface. Step S2, connect the external water supply equipment and information equipment: use a sealed steel wire reinforced hose to hydraulically connect the sensors inside the caisson, the surface reference sensor and the water storage tank, and use a data cable to connect the sensors inside the caisson, the surface reference sensor and the data recording equipment. Step S3: Purge air and vent water to perform circuit debugging; Step S4: After starting work, the height of the sensor inside the caisson and the inclination of the caisson are calculated by using the hydraulic connection principle through the pressure difference between the sensor inside the caisson and the reference sensor on the ground surface. Preferably, the liquid in the water storage tank is degassed water, and the water is degassed by applying negative pressure to the water storage tank for 24 hours; the liquid in the water storage tank is filled with antifreeze in a 3:1 ratio of water to antifreeze to lower the freezing point in the pipeline, and sodium fluorescein green dye is added to the liquid in the water storage tank to identify air in the water.

[0011] Preferably, the data recording and processing equipment is a multi-channel data acquisition instrument. The output signals of the sensors inside the caisson and the surface reference sensors are uniformly connected to the multi-channel data acquisition instrument. The embedded software calculates the elevation of each point and the inclination of the caisson in real time and sends them remotely to the monitoring platform.

[0012] Preferably, the formula for calculating the height of the sensor inside the caisson is as follows: ; in, For the first The elevation of the sensor inside the No. 1 caisson. The elevation of the ground reference sensor. The pressure is referenced by a surface sensor. For the first The pressure of the sensor inside the No. 1 caisson The density of the liquid inside the pipe.

[0013] The preferred formula for calculating the inclination of the caisson is as follows: ; ; ; in , , They are respectively direction, Direction and overall tilt The diameter of the caisson.

[0014] Therefore, the present invention employs the above-mentioned real-time attitude monitoring system and method for caissons based on the principle of hydraulic connection, which has the following beneficial effects: This invention calculates the sinking height and inclination of a caisson by arranging pressure sensors inside the caisson and constructing a closed liquid network, using the principle of communicating vessels. Compared with traditional technologies, it has the advantages of high accuracy, simple deployment, strong anti-interference ability, simple maintenance, and unattended operation.

[0015] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an embodiment of the real-time attitude monitoring system for caissons based on the hydraulic connection principle of the present invention; Figure 2 This is a schematic diagram of the system connection method of the real-time attitude monitoring system for caissons based on the hydraulic connection principle of the present invention.

[0017] In the diagram: 1. Liquid storage tank, 2. Surface reference sensor, 3. Data cable, 4. Data recording and processing equipment, 5. Liquid transmission pipeline, 6. Main body of the caisson, 7. Sensor inside the caisson. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0019] It should be noted that the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such as a process, method, system, product, or server that includes a series of steps or units, not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products, or devices.

[0020] Similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Example: like Figure 1 As shown, the present invention discloses a real-time attitude monitoring system for a caisson based on the principle of hydraulic connection, comprising a caisson body 6. Within the caisson body 6, four sensors 7 are installed at the same height, and these sensors are used to collect water pressure data at the same height within the caisson. The four sensors 7 are mounted on the caisson wall at the same height within the caisson body 6, and are located at quarter points of the tangent circle within the caisson body 6. The sensors 7 are installed in a container with an IP68 protection rating and are equipped with an exhaust valve for flushing the system during commissioning.

[0024] The main body 6 of the caisson is equipped with a surface reference sensor 2, a liquid storage tank 1, and a data recording and processing device 4. The liquid storage tank 1 is connected to the surface reference sensor 2 and the sensor 7 inside the caisson via a liquid transmission pipeline 5. The surface reference sensor 2 and the sensor 7 inside the caisson are connected to the data recording and processing device 4 via a data cable 3. The liquid storage tank 1 and the data recording and processing device 4 are located in a control room on the ground. The liquid storage tank 1 is equipped with a vacuum degassing device, which can use any existing sealed degassing equipment, such as a commercially available vacuum degassing machine. The liquid transmission pipeline 5 is a sealed steel wire reinforced hose, with a protective sleeve covering the outside of the sealed steel wire reinforced hose, and is laid along the well wall.

[0025] like Figure 2As shown, the real-time attitude monitoring method for caissons based on the principle of hydraulic connection described in this invention, taking a large-diameter caisson with a diameter of 32m in a certain actual project as an example, includes the following steps: Step S1, Install sensors: Place four high-precision pressure sensors (PT1-PT4) at four equal points on the inner wall of the caisson, 3.5m above the ground. Install one high-precision pressure sensor on the ground surface as a ground reference sensor 2.

[0026] Step S2, Connecting External Water Supply Equipment and Information Equipment: Use sealed steel wire reinforced hoses to connect the sensors 7 (PT1-PT4) inside the caisson and the surface reference sensor 2 (PT1-PT4) to the external water supply equipment and information equipment. ref It is hydraulically connected to a 100L water storage tank. The diameter of the sealed steel wire reinforced hose is 1.27cm and the total length of the pipeline is 150m. The data cable 3 is used to connect the sensor 7 inside the caisson, the surface reference sensor 2 and the junction box. After tidying up the cable, it is connected to the data recording equipment. The data recording and processing device 4 is a multi-channel acquisition instrument. The output signals of the sensors 7 inside the caisson and the surface reference sensor 2 are uniformly connected to the multi-channel acquisition instrument. The embedded software calculates the elevation of each point and the inclination of the caisson in real time and sends them remotely to the monitoring platform.

[0027] Step S3: Water purging and venting. The working medium is a mixture of degassed pure water and propylene glycol antifreeze. Data cable 3 is debugged. The specific venting method is to apply negative pressure to the water collection tank for 24 hours to degassed the water. Then, the sensor zero point is calibrated and a reference point is established with the ground reference sensor 2 as the center. Considering the potential for low temperatures on-site, antifreeze was added at a ratio of 3:1 (water to antifreeze) to lower the freezing point in the pipeline to approximately -10°C. To detect air in the water, sodium fluorescein green dye was added to the liquid.

[0028] Step S4: After starting work, the height of sensor 7 inside the caisson and the inclination of the caisson are calculated by using the hydraulic connection principle through the pressure difference between sensor 7 inside the caisson and reference sensor 2 on the ground surface.

[0029] The formula for calculating the height of sensor 7 inside the caisson is as follows: ; in, For the first The elevation of the sensor inside the No. 1 caisson. The elevation of the ground reference sensor. The pressure is referenced by a surface sensor. For the first The pressure of the sensor inside the No. 1 caisson The density of the liquid inside the pipe was determined by testing. .

[0030] The formula for calculating the inclination of a caisson is as follows: ; ; ; in , , They are respectively direction, Direction and overall tilt The diameter of the caisson.

[0031] Ultimately, the sinking process of the caisson was successfully monitored 19 times. The monitoring accuracy was within ±2mm compared with manual measurement, which fully met the project requirements.

[0032] Therefore, the present invention adopts the above-mentioned real-time attitude monitoring system and method for caissons based on the principle of hydraulic communication. By arranging pressure sensors inside the caisson and constructing a closed liquid network, the sinking height and tilt of the caisson are calculated using the principle of communicating vessels. This solves the problems of low accuracy, complex layout, weak anti-interference ability, difficult maintenance, and need for manual operation of traditional technologies.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A real-time attitude monitoring system for a caisson based on the principle of hydraulic connection, comprising a caisson body, characterized in that: The caisson body is equipped with sensors at the same height. The caisson body is also equipped with a surface reference sensor, a liquid storage tank, and data recording and processing equipment. The sensors inside the caisson are used to collect water pressure data at the same height inside the caisson. The liquid storage tank is connected to the surface reference sensor and the sensors inside the caisson through a liquid transmission pipeline. The surface reference sensor and the sensors inside the caisson are connected to the data recording and processing equipment through a data cable.

2. The real-time attitude monitoring system for caissons based on the hydraulic connection principle according to claim 1, characterized in that: There are four sensors installed inside the caisson. The four sensors are installed on the caisson wall at the same height inside the caisson body and are located at the quarter points of the tangent circle inside the caisson body. The sensors inside the caisson are installed in a container with an IP68 protection rating and are equipped with an exhaust valve.

3. The real-time attitude monitoring system for caissons based on the hydraulic connection principle according to claim 1, characterized in that: The liquid storage tank and data recording and processing equipment are located in the control room on the ground.

4. The real-time attitude monitoring system for caissons based on the hydraulic connection principle according to claim 1, characterized in that: The storage tank is equipped with a vacuum degassing device.

5. The real-time attitude monitoring system for caissons based on the hydraulic connection principle according to claim 1, characterized in that: The liquid transmission pipeline uses a sealed steel wire reinforced hose, and a protective sleeve is installed on the outside of the sealed steel wire reinforced hose. The liquid transmission pipeline is laid along the well wall.

6. A method for real-time attitude monitoring of a caisson based on the principle of hydraulic connection, employing the real-time attitude monitoring system for a caisson based on the principle of hydraulic connection as described in any one of claims 1-5, characterized in that, Includes the following steps: Step S1, Install sensors: Place four high-precision pressure sensors at the quarter points of the inscribed circle at the same height inside the caisson as sensors inside the caisson, and install one high-precision pressure sensor on the ground surface as a reference sensor on the ground surface. Step S2, connect the external water supply equipment and information equipment: use a sealed steel wire reinforced hose to hydraulically connect the sensors inside the caisson, the surface reference sensor and the water storage tank, and use a data cable to connect the sensors inside the caisson, the surface reference sensor and the data recording equipment. Step S3: Purge air and vent water to perform circuit debugging; Step S4: After starting work, the height of the sensor inside the caisson and the inclination of the caisson are calculated by using the hydraulic connection principle through the pressure difference between the sensor inside the caisson and the reference sensor on the ground surface.

7. The real-time attitude monitoring method for caissons based on the hydraulic connection principle according to claim 6, characterized in that: The liquid in the storage tank is degassed water, which is degassed by applying negative pressure to the storage tank. Antifreeze is added to the liquid in the storage tank to lower the freezing point in the pipeline, and sodium fluorescein green dye is added to the liquid in the storage tank to identify air in the water.

8. The real-time attitude monitoring method for caissons based on the hydraulic connection principle according to claim 6, characterized in that: The data recording and processing equipment is a multi-channel data acquisition instrument. The output signals of the sensors inside the caisson and the surface reference sensors are uniformly connected to the multi-channel data acquisition instrument. The embedded software calculates the elevation of each point and the inclination of the caisson in real time and sends them remotely to the monitoring platform.

9. The real-time attitude monitoring method for caissons based on the hydraulic connection principle according to claim 6, characterized in that: The formula for calculating the height of the sensor inside the caisson is as follows: ； in, For the first The elevation of the sensor inside the No. 1 caisson. The elevation of the ground reference sensor. The pressure is referenced by a surface sensor. For the first The pressure of the sensor inside the No. 1 caisson The density of the liquid inside the pipe.

10. The real-time attitude monitoring method for caissons based on the hydraulic connection principle according to claim 9, characterized in that: The formula for calculating the inclination of a caisson is as follows: ； ； ； in , , They are respectively direction, Direction and overall tilt The diameter of the caisson.

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