A reusable diaphragm wall leakage detection device

Abstract

This invention discloses a reusable diaphragm wall leakage detection device, comprising a detection tube disposed on the outside of the diaphragm wall, a heating device and a measuring device disposed inside the detection tube, the heating device being connected to an external temperature controller, and the measuring device being connected to an external fiber optic demodulator. Both the fiber optic demodulator and the temperature controller are connected to a leakage analysis host, which analyzes the fiber optic demodulator and provides signals to the temperature controller to adjust the heating device. The detection tube is placed by drilling holes on the outside of the diaphragm wall joint, eliminating the need to weld the detection device to the diaphragm wall reinforcement cage. The servo motor controls the opening and closing turntable and connecting rod to achieve deployment / retraction, allowing the sensor and heating band to be in close contact with the detection tube, resulting in more accurate detection and easier recycling, significantly saving costs. The temperature controller controls the heating band for nonlinear heating, maintaining a constant temperature of the groundwater around the detection device, making it more sensitive to temperature changes caused by leakage water and improving measurement accuracy.

Description

Technical Field

[0001] This invention relates to the field of safety risk detection technology for foundation pit engineering, and in particular to a reusable diaphragm wall leakage detection device. Background Technology

[0002] In recent years, due to rapid economic development, the number of high-rise buildings and underground rail transit systems has been increasing, often requiring deep foundation pit excavation. Due to their excellent soil retention, waterproofing, integrity, and high rigidity, diaphragm walls are frequently used for the support of deep foundation pit projects. However, the segmented construction method used in diaphragm wall construction, where concrete is poured at the joints between sections for connection, often leads to water leakage if the concrete is not properly compacted. If not detected in time, this can further cause water inrush during excavation, seriously affecting the safety of the foundation pit project.

[0003] Currently, the main methods for detecting water leakage in diaphragm walls include electrical measurement, resistivity method, and acoustic wave detector method. These methods have some drawbacks: high cost, poor anti-interference ability, and insufficient detection accuracy. Distributed optical fiber detection technology is widely used due to its ability to detect the accurate location of water leakage, remote measurement, and its relatively lightweight characteristics. However, the commonly used optical fiber detectors still have shortcomings: (1) High cost and poor recyclability: Current optical fiber detectors are often welded to the joints of the diaphragm wall reinforcement cage during welding, which may cause damage during concrete pouring. In addition, they cannot be recycled after detection. (2) Insufficient accuracy: Since the groundwater temperature decreases with depth, the constant temperature heating belt used in current optical fiber detectors cannot maintain the same temperature in the groundwater environment at different depths, resulting in the detector being less sensitive to temperature changes. If the water leakage is slight, it may not be detected in time.

[0004] Based on the above characteristics, solving the problems of poor recyclability, high cost and insufficient accuracy of current fiber optic detectors will help promote the use of distributed fiber optic detection for seepage in underground continuous walls, providing safer and more economical detection technologies and methods for foundation pit excavation, which is of great engineering significance for foundation pit engineering. Summary of the Invention

[0005] In order to address the shortcomings and deficiencies of existing fiber optic technologies for detecting water leakage in diaphragm walls, this invention proposes a reusable diaphragm wall leakage detection device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A reusable diaphragm wall leakage detection device includes a detection tube disposed on the outside of the joint of the diaphragm wall. A heating device and a measuring device are disposed inside the detection tube. The heating device is connected to an external temperature controller. The measuring device is connected to an external fiber optic demodulator. Both the fiber optic demodulator and the temperature controller are connected to a leakage analysis host. The leakage analysis host is used to analyze the signals from the fiber optic demodulator and the temperature controller to adjust the heating device.

[0008] As a further improvement to the above technical solution:

[0009] Preferably, the measuring device includes a rubber tube located inside the detection tube and a distributed optical fiber detector disposed outside the rubber tube. The distributed optical fiber detector consists of multiple optical fiber temperature sensors connected by optical fiber signal lines, one end of which is connected to an optical fiber demodulator.

[0010] Preferably, the rubber tube is a hollow circular tube made of heat-insulating rubber.

[0011] Preferably, the rubber tube is divided into four sections along its circumference, and each section has a connecting rod connected to the opening and closing control device in the middle.

[0012] Preferably, the opening and closing device includes a servo motor fixedly mounted externally, a servo controller connected to the servo motor, an opening and closing auxiliary rotating rod connected to the output shaft of the servo motor, a plurality of drive gears mounted on the opening and closing auxiliary rotating rod, an opening and closing main rotating rod mounted in the middle of the rubber tube, and a plurality of driven gears mounted on the opening and closing main rotating rod. The driven gears mesh with the drive gears. The driven gears are provided with four circular arc opening and closing grooves arranged in a circular array. A connecting rod is slidably mounted in the circular arc opening and closing grooves. The upper ends of the opening and closing main rotating rod and the opening and closing auxiliary rotating rod are rotatably connected to a fixed rod fixed externally.

[0013] Preferably, the heating device is a non-linear heating belt.

[0014] Preferably, the detection tube is a hollow flower tube, and the diameter of the detection tube is larger than the size of the measuring device after the heating device is installed.

[0015] Compared with existing technologies, the beneficial effects of this invention are:

[0016] The detection tube is placed by drilling holes on the outside of the diaphragm wall, eliminating the need to weld the detection device to the diaphragm wall reinforcement cage. Simultaneously, the detection device is longitudinally divided into multiple parts, and its deployment / retraction is achieved using an opening and closing turntable and connecting rod. This allows the sensor and heating band to be in close contact with the detection tube, resulting in more accurate detection and easier recovery. This enables cyclical and high-precision detection of diaphragm wall leakage in foundation pits, effectively reducing construction risks and significantly saving costs. Furthermore, a temperature controller is used to control the nonlinear heating band, adjusting its compensation temperature based on the existing groundwater temperature to maintain a constant groundwater temperature around the detection device. This makes it more sensitive to temperature changes caused by leakage water, improving measurement accuracy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the reusable diaphragm wall leakage detection device of the present invention.

[0018] Figure 2 This is a top view of the reusable diaphragm wall leakage detection device of the present invention.

[0019] Figure 3 This is a schematic diagram of the reusable diaphragm wall leakage detection device (without detection tube) of the present invention.

[0020] Figure 4 for Figure 3 Diagram of the middle section cut-off structure;

[0021] Figure 5 This is a schematic diagram of the connection between the connecting rod and the rubber tube in this invention;

[0022] Figure 6 This is a schematic diagram of the heating device structure in this invention;

[0023] Figure 7 This is a schematic diagram of the measuring device structure in this invention;

[0024] Figure 8 This is a schematic diagram of a practical application scenario in this invention.

[0025] In the diagram: 1. Servo motor; 2. Main rotating rod for opening and closing; 3. Driven gear; 4. Secondary rotating rod for opening and closing; 5. Drive gear; 6. Rubber tube; 7. Fiber optic temperature sensor; 8. Fiber optic demodulator; 9. Nonlinear heating belt; 10. Temperature controller; 11. Fiber optic signal line; 12. Connecting rod; 13. Leakage analysis host; 14. Servo controller; 15. Detection tube. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] Example:

[0030] As attached Figure 1 ~Attached Figure 8 As shown, the present invention specifically includes two parts: one is a data processing and control related device located on the ground, and the other is a data acquisition device located underground.

[0031] The main components located on the ground include a fiber optic demodulator 8 and a temperature controller 10, both of which are connected to the leakage analysis host 13.

[0032] The main underground component is the detection pipe 15, which is installed inside the diaphragm wall outside the foundation pit. The detection pipe 15 is used to protect the distributed fiber optic detector and transmit the groundwater temperature. The detection pipe 15 is a hollow tube made of steel with good thermal conductivity. It is closed at the bottom and open at the top, and its diameter is larger than that of the rubber tube 6 after the fiber optic detector and heating belt are installed. Before conducting water leakage detection, holes are drilled near the joints of the diaphragm wall outside the foundation pit to place the detection pipe 15.

[0033] A measuring device is installed inside the detection tube 15. The measuring device is used to continuously monitor the initial temperature and the temperature after heating of the groundwater along the depth direction near the joint of the underground continuous wall, and to analyze the depth and size of the leakage. The measuring device mainly includes a rubber tube 6 and a distributed optical fiber detector installed on the outer surface of the rubber tube 6.

[0034] The fiber optic detector consists of multiple fiber optic temperature sensors 7, which are connected by fiber optic signal lines 11. One end of each fiber optic signal line 11 is connected to a fiber optic demodulator 8, transmitting the measurement signals from the fiber optic temperature sensors 7 to the demodulator 8. The demodulator 8 is connected to a leakage analysis host 13. The demodulator receives wavelength signals, converts them into temperature data, and transmits it to the leakage analysis host 13. The leakage analysis host 13 processes the data transmitted by the demodulator and, through real-time data analysis, determines the location and size of potential leaks.

[0035] The rubber tube 6 also has a heating device, which is mainly a nonlinear heating belt 9. The nonlinear heating belt 9 is connected to the temperature controller 10, and the temperature controller 10 is connected to the leakage analysis host 13. The leakage analysis host 13 receives the initial temperature of groundwater at different depths measured by the fiber optic temperature sensor 7 and transmits it to the temperature controller 10. The temperature controller 10 calculates the compensation temperature at different depths based on the received temperature and adjusts the nonlinear heating belt 9 to heat to the compensation temperature, thereby achieving a consistent groundwater environment temperature at different depths around the detection device.

[0036] Because of the presence of the nonlinear heating band 9, the rubber tube 6 is a hollow round tube made of heat-insulating rubber to prevent the temperature of the heating band from being directly transmitted to the fiber optic temperature sensor 7, which would lead to measurement errors.

[0037] As can be seen from the attached diagram, the rubber tube 6 is divided into multiple segments along its circumference. Each segment has a connecting rod 12 that is slidably connected to the arc-shaped opening and closing groove in the driven gear 3. Multiple driven gears 3 are evenly arranged on the main opening and closing rotating rod 2 along the depth direction. A drive gear 5 meshes on each driven gear 3. The drive gear 5 is fixed on the secondary opening and closing rotating rod 4. The upper end of the secondary opening and closing rotating rod 4 is connected to the output shaft of the servo motor 1 outside the servo motor. The servo motor 1 is connected to the servo controller 14. Both the main opening and closing rotating rod 2 and the secondary opening and closing rotating rod 4 are limited to rotating on a fixed rod. The fixed rod is fixedly set on the bottom surface.

[0038] Servo motor 1 controls the opening and closing auxiliary rotating rod 4 to drive the drive gear 5 to rotate, thereby driving the driven gear 3 to rotate around the opening and closing main rotating rod 2, further driving the connecting rod 12 to extend or retract, controlling the expansion and retraction of the multi-segment rubber tube 6, so that the fiber optic detector and nonlinear heating tape 9 are in close contact with the detection tube 15 for detection or retraction, realizing the recycling of the detection device; servo controller 14 is used to precisely control the rotation amount of servo motor 1;

[0039] The above-mentioned technical solution allows for drilling holes on the outside of the diaphragm wall to place the detection tube 15, eliminating the need to weld the detection device to the diaphragm wall reinforcement cage. Simultaneously, the detection device is longitudinally divided into multiple parts, and its deployment / retraction is achieved using an opening and closing turntable and connecting rod 12. This allows the sensor and heating band to be in close contact with the detection tube 15, resulting in more accurate detection and easier recovery, significantly saving costs. Furthermore, a temperature controller 10 controls the nonlinear heating band 9, adjusting its compensation temperature based on the existing groundwater temperature to maintain a constant groundwater temperature around the detection device. This makes it more sensitive to temperature changes caused by seepage, improving measurement accuracy. This technical solution solves the problems of non-reusability and insufficient accuracy in diaphragm wall leakage detection devices in related technologies.

[0040] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A reusable diaphragm wall leakage detection device, characterized in that: The system includes a detection tube (15) located outside the joint of the underground continuous wall. A heating device and a measuring device are installed inside the detection tube (15). The heating device is connected to an external temperature controller (10), and the measuring device is connected to an external fiber optic demodulator (8). Both the fiber optic demodulator (8) and the temperature controller (10) are connected to a leakage analysis host (13). The leakage analysis host (13) is used to analyze the signal from the fiber optic demodulator (8) and to adjust the heating device by giving signals to the temperature controller. The measuring device includes a rubber tube (6) located inside the detection tube (15). The rubber tube (6) is a hollow round tube and is made of heat-insulating rubber; The rubber tube (6) is divided into four sections along the circumference of the tube, and each section has a connecting rod (12) connected to the opening and closing control device in the middle. The opening and closing control device includes a servo motor (1) fixedly installed externally, a servo controller (14) connected to the servo motor (1), an opening and closing auxiliary rotating rod (4) connected to the output shaft of the servo motor (1), a plurality of drive gears (5) set on the opening and closing auxiliary rotating rod (4), an opening and closing main rotating rod (2) set in the middle of the rubber tube (6), and a plurality of driven gears (3) set on the opening and closing main rotating rod (2). The driven gears (3) mesh with the drive gears (5). The driven gears (3) are provided with four circular arc opening and closing grooves arranged in a circular array. A connecting rod (12) is slidably arranged in the circular arc opening and closing grooves. The upper ends of the opening and closing main rotating rod (2) and the opening and closing auxiliary rotating rod (4) are rotatably connected to a fixed rod fixed externally.

2. The reusable diaphragm wall leakage detection device according to claim 1, characterized in that: The measuring device includes a distributed optical fiber detector disposed on the outer surface of the rubber tube (6). The distributed optical fiber detector consists of multiple optical fiber temperature sensors (7). The optical fiber temperature sensors (7) are connected by optical fiber signal lines (11). One end of the optical fiber signal lines (11) is connected to an optical fiber demodulator (8).

3. The reusable diaphragm wall leakage detection device according to claim 1, characterized in that: The heating device is a nonlinear heating belt (9).

4. The reusable diaphragm wall leakage detection device according to claim 1, characterized in that: The detection tube (15) is a hollow flower tube, and the diameter of the detection tube (15) is larger than the diameter of the measuring device after the heating device is installed.

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