Pressure distribution detection device and method for inner and outer combination pressurization of foundation pit support

Abstract

This invention provides a pressure distribution detection device and method for combined internal and external pressurization and leak sealing in foundation pit support, relating to the field of foundation pit construction technology. It includes a first pressure detection component installed at the inlets of grouting pipes on the inner and outer sides of the foundation pit, a second pressure detection component for extending into the leak point, and a display module. The first pressure detection component includes a ring-shaped bladder and a first pressure detection probe; the second pressure detection component includes a flexible wire, a bladder ball, a second pressure detection probe, and an expansion section; the display module receives and displays the pressure data detected by the first and second pressure detection probes. This invention enables real-time detection of the pressure distribution on the inner and outer sides of the foundation pit support structure, obtaining pressure change information on the inner and outer sides of the support structure during leak sealing, providing a basis for pressure analysis and leak sealing effect evaluation, and improving the accuracy and reliability of detection.

Description

Technical Field

[0001] This invention relates to the field of foundation pit construction technology, and more specifically, to a device and method for detecting the pressure distribution of foundation pit support combined with internal and external pressure sealing. Background Technology

[0002] During the construction of foundation pit projects, when the groundwater level is high, the soil layer has a high water content, or the construction quality of the cutoff wall is insufficient in some areas, the support structure is prone to seepage and leakage. Seepage not only reduces the stability of the foundation pit support system, but may also cause problems such as soil erosion outside the pit, surface settlement, and deformation of surrounding buildings. Therefore, it is usually necessary to take measures to stop the leakage.

[0003] In related technologies, the treatment of leakage problems in foundation pit support structures often employs internal grouting for sealing, external high-pressure jet grouting for reinforcement, or other single methods. However, in practical applications, these methods often struggle to accurately grasp the pressure changes during grout diffusion, particularly lacking simultaneous monitoring and analysis of the pressure state on both the inner and outer sides of the support structure. Improper grouting pressure control can easily lead to uneven grout diffusion, unstable sealing effects, and even cracking and deformation of the support structure due to excessive local pressure, thus affecting the safety and reliability of the foundation pit project. Summary of the Invention

[0004] The purpose of this invention is to provide a pressure distribution detection device and method for combined internal and external pressure sealing of foundation pit support, which can detect the pressure distribution state of the inner and outer sides of the foundation pit support structure in real time, obtain the pressure change information of the inner and outer sides of the support structure during the sealing process, provide a basis for pressure analysis and sealing effect evaluation, and improve the accuracy and reliability of detection.

[0005] Firstly, the present invention is achieved through the following technical solution: A pressure distribution detection device for combined internal and external pressurization and leak sealing in foundation pit support includes a first pressure detection component installed at the grouting pipe openings on the inner and outer sides of the foundation pit, a second pressure detection component for extending into the leak point, and a display module. The first pressure detection component includes a ring bladder and a first pressure detection probe. The ring bladder is covered on the inner wall of the corresponding grouting pipe opening and is filled with liquid. The detection end of the first pressure detection probe extends into the ring bladder and comes into contact with the liquid. The second pressure detection assembly includes a flexible wire, a bulb, a second pressure detection probe, and an expansion section. The flexible wire is used to extend into the leak point. The bulb is located at the end of the flexible wire and is filled with liquid. The detection end of the second pressure detection probe is located inside the bulb and is in contact with the liquid. The expansion section is located on the flexible wire near the bulb. The expansion section can switch between an expanded state and a retracted state. In the expanded state, it forms an umbrella-shaped structure. In the retracted state, it fits against the outside of the flexible wire. The opening of the umbrella-shaped structure faces the direction of the leak point opening. The display module is electrically connected to the first pressure detection probe and the second pressure detection probe corresponding to the grouting pipes inside and outside the foundation pit, respectively, and is used to receive and display the pressure data detected by the first pressure detection probe and the second pressure detection probe.

[0006] Preferably, a support frame is fixedly provided on the inner wall of the grouting pipe opening. The support frame is a mesh structure, and an installation space is formed between the support frame and the inner wall of the grouting pipe opening. The annular bladder is embedded in the installation space.

[0007] Preferably, the annular bladder has a guide slope on the side away from the grouting pipe opening.

[0008] Preferably, a plurality of first pressure detection probes are provided on the same grouting pipe, the plurality of first pressure detection probes are distributed at intervals along the axial and / or circumferential direction of the grouting pipe, and are all electrically connected to the display module.

[0009] Preferably, each of the grouting pipes is provided with a corresponding display module, and the display module is electrically connected to the first pressure detection probe on the corresponding grouting pipe.

[0010] Preferably, the expansion section includes multiple deformable rods and a deformable plate. The multiple deformable rods are spaced apart along the circumference of the flexible wire and form a ring structure. The deformable plate is connected between the multiple deformable rods. When the multiple deformable rods deform, they can drive the deformable plate to unfold and form an umbrella-shaped structure.

[0011] Preferably, the multiple deformable rods are arranged outward in their natural state. The expansion portion further includes a drive ring, which is sleeved on the outside of the flexible wire. The drive ring has a guide slope on the side facing the deformable plate. The drive ring can slide along the axial direction of the flexible wire so that the guide slope abuts against the multiple deformable rods and drives the multiple deformable rods to retract inward.

[0012] Preferably, the drive ring is connected to the output end of a small electric actuator, which is used to drive the drive ring to move axially along the flexible wire.

[0013] Preferably, the maximum outer diameter of the expansion portion when it is in the expanded state is greater than the maximum outer diameter of the sac-like structure.

[0014] Secondly, the present invention is achieved through the following technical solution: A method for using a pressure distribution detection device for combined internal and external pressurization and leak sealing in foundation pit support, employing the pressure distribution detection device for combined internal and external pressurization and leak sealing in foundation pit support as described in the above scheme, includes the following steps: S1. Arrange the grouting pipe inside the pit and the grouting pipe outside the pit equipped with the first pressure detection component to correspond to the leak point, and make the expansion part of the second pressure detection component in the unfolded state. S2. Perform internal and external combined pressure sealing construction. Under the action of grout pressure, the second pressure detection component moves along the leak point with the grout and enters the interior of the leak point. The umbrella-shaped structure formed by the expansion part faces the direction of the leak point opening. S3. During the leak sealing process, the pressure data at the grouting pipe openings inside and outside the foundation pit are detected using the first pressure detection probe, and the pressure data inside the leak point is detected using the second pressure detection probe. S4. The pressure data detected by the first pressure detection probe and the second pressure detection probe are transmitted to the display module. The display module synchronously displays the pressure data of the grouting pipe inside the foundation pit, the grouting pipe outside the foundation pit, and the inside of the leak point to obtain the pressure distribution during the leak sealing process. S5. After completing the pressure test, switch the expansion section to the retracted state and pull the second pressure detection component out from the leak point using a flexible wire.

[0015] The technical solution of the present invention has at least the following advantages and beneficial effects: This invention, through the provision of a first pressure detection component, a second pressure detection component, and a display module, can detect the pressure of the grouting pipe inside the foundation pit, the grouting pipe outside the foundation pit, and the leak point, and simultaneously display the detected pressure data, thereby obtaining the pressure distribution during the leak sealing process.

[0016] Since the first pressure detection component is located at the grouting pipe inlet and the second pressure detection component can extend into the leak point, it can simultaneously reflect the pressure status at the grouting end and the leak point. Compared with the existing technology which lacks detection of internal and external pressure distribution, this application can provide data support for pressure analysis, pressure change judgment and leak sealing effect evaluation during the leak sealing process, thereby improving the accuracy and reliability of pressure detection. Attached Figure Description

[0017] Figure 1 A reference diagram illustrating the usage status of a pressure distribution detection device for combined internal and external pressurization and leak sealing in foundation pit support, provided by this invention; Figure 2 This is a schematic diagram of the overall structure of a pressure distribution detection device for combined internal and external pressurization and leak sealing in foundation pit support, provided by the present invention. Figure 3 for Figure 2 Enlarged view of section A; Figure 4 This invention aims to illustrate the unfolded state of the expanded portion; Figure 5 This invention aims to illustrate the contracted state of the expanded portion; Figure 6 This invention aims to illustrate a cross-sectional view of the grouting pipe; Figure 7 This is a schematic diagram illustrating the structure of the annular capsule and supporting skeleton of the present invention; Reference numerals: 100-First pressure detection component, 110-ring bladder, 111-guide ramp, 120-First pressure detection probe, 200-Second pressure detection component, 210-flexible wire, 220-bladder ball, 230-Second pressure detection probe, 240-expansion section, 241-deformation rod, 242-deformation plate, 243-drive ring, 2431-guide ramp, 2432-small electric push rod, 300-display module, 400-grouting pipe, 410-support frame, 411-installation space, 500-foundation pit, 510-leakage point. Detailed Implementation

[0018] 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, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] The following is for reference Figures 1-7As shown in the illustration, and further explained with reference to a specific embodiment, this embodiment provides a pressure distribution detection device for combined internal and external pressurization and leak sealing in foundation pit support. The device includes a first pressure detection component 100 located at the inlets of grouting pipes 400 on the inner and outer sides of the foundation pit 500, a second pressure detection component 200 for extending into the leak point 510, and a display module 300. The grouting pipes 400 on the inner and outer sides of the foundation pit 500 can be arranged on both sides of the support structure according to actual leak sealing requirements, delivering grout to the leak point 510 area through a combined internal and external grouting method.

[0021] The first pressure detection component 100 is used to detect the pressure status at the outlet of the grouting pipe 400, the second pressure detection component 200 is used to detect the pressure status inside the leak point 510, and the display module 300 is used to receive and display the pressure data at each detection location, thereby forming a detection of the pressure distribution during the leak sealing process. By synchronously acquiring pressure data at different locations, a basis can be provided for pressure analysis and effect evaluation during the leak sealing process.

[0022] The first pressure detection component 100 includes a ring bladder 110 and a first pressure detection probe 120. The ring bladder 110 is covered on the inner wall of the corresponding grouting pipe 400 opening and is filled with liquid. The detection end of the first pressure detection probe 120 extends into the ring bladder 110 and comes into contact with the liquid.

[0023] When the grout flows through the grouting pipe 400 and is discharged from the pipe opening, the grout pressure can act on the annular bladder 110, causing a corresponding pressure change in the liquid inside the annular bladder 110. The first pressure detection probe 120 detects the outlet pressure of the grouting pipe 400 by detecting the liquid pressure.

[0024] Because liquids have the characteristic of uniform pressure transmission, the pressure at different locations inside the annular bladder 110 remains essentially constant. Therefore, a single first pressure detection probe 120 can reflect the pressure at the outlet of the corresponding grouting pipe 400. Furthermore, the annular bladder 110 employs a circumferential distribution structure, which, compared to localized point detection methods, provides a more comprehensive view of the pressure conditions, thereby improving the stability and accuracy of pressure detection.

[0025] In the specific structure, the ring bladder 110 can be made of rubber, silicone, polyurethane elastic material or other flexible pressure-resistant and wear-resistant materials to ensure good deformation ability and sealing performance under the action of slurry pressure.

[0026] The liquid filling the annular bladder 110 can be water, silicone oil, antifreeze, or other pressure transmission media; the specific type is not limited, as long as it meets the pressure transmission requirements. The first pressure detection probe 120 can be a piezoresistive pressure sensor, a piezoelectric pressure sensor, or other detection element capable of detecting changes in liquid pressure.

[0027] The second pressure detection assembly 200 includes a flexible wire 210, a bulb 220, a second pressure detection probe 230, and an expansion section 240. The flexible wire 210 is used to extend into the leak point 510. The bulb 220 is disposed at the end of the flexible wire 210 and is filled with liquid. The detection end of the second pressure detection probe 230 is disposed inside the bulb 220 and is in contact with the liquid. The expansion section 240 is disposed near the bulb 220 of the flexible wire 210. The expansion section 240 can switch between an expanded state and a contracted state. In the expanded state, it forms an umbrella-shaped structure. In the contracted state, it fits against the outside of the flexible wire 210. The opening of the umbrella-shaped structure faces the direction of the opening of the leak point 510.

[0028] In actual use, the expansion section 240 is usually in the unfolded state. When the slurry is injected from both the inside and outside, the impact force generated by the slurry flow can act on the umbrella-shaped structure, causing the second pressure detection component 200 to move into the leak point 510 along with the slurry, so that the balloon 220 can enter the depth of the leak point 510 to perform pressure detection.

[0029] After the balloon 220 enters the leak point 510, its outer surface can fully contact the slurry around the leak point 510. The slurry pressure is transmitted to the internal liquid through the wall of the balloon 220. The second pressure detection probe 230 then detects the internal liquid pressure, thereby reflecting the actual pressure state inside the leak point 510.

[0030] Because the bulb 220 has a certain degree of flexibility, it can adapt to leak points 510 of different sizes and shapes, thus improving detection adaptability. After the test is completed, the expansion section 240 can be switched to the retracted state. At this time, the expansion section 240 fits against the outside of the flexible wire 210, and the overall outer diameter is reduced, which makes it easier to pull the second pressure detection component 200 out of the leak point 510 through the flexible wire 210, improving the convenience of reusability of the device.

[0031] The umbrella-shaped structure not only increases the pushing effect of the slurry on the second pressure detection component 200, but also plays a guiding role in the process of entering the leak point 510, making it easier for the second pressure detection component 200 to enter the leak point 510 area along the slurry flow direction.

[0032] Meanwhile, the opening of the umbrella-shaped structure faces the direction of the opening of the leak point 510, so that the impact force of the slurry can be more concentrated on the expansion section 240, thereby improving the efficiency of the second pressure detection component 200 entering the leak point 510.

[0033] The display module 300 is electrically connected to the first pressure detection probe 120 and the second pressure detection probe 230 corresponding to the grouting pipe 400 inside and outside the foundation pit 500, respectively, and is used to receive and display the pressure data detected by the first pressure detection probe 120 and the second pressure detection probe 230.

[0034] Through the display module 300, construction personnel can view the pressure changes in the grouting pipe 400 inside the foundation pit 500, the grouting pipe 400 outside the foundation pit 500, and inside the leak point 510 in real time, thereby obtaining pressure distribution information during the leak sealing process. The display module 300 can be connected to each pressure detection probe via wired communication or via wireless communication for data transmission.

[0035] In a specific embodiment, the display module 300 can be a structure such as a display screen. For example, it can be an industrial display, a tablet terminal, a handheld display terminal, or an integrated control terminal. In addition to displaying pressure values, the display module 300 can also display pressure curves, pressure change trends, pressure differences, and other information to facilitate observation and analysis by personnel.

[0036] A support frame 410 is fixedly installed on the inner wall of the grouting pipe 400. The support frame 410 has a grid structure, and an installation space 411 is formed between the support frame 410 and the inner wall of the grouting pipe 400. The annular bladder 110 is embedded in the installation space 411. The support frame 410 provides support and protection for the annular bladder 110, preventing excessive deformation of the annular bladder 110 due to direct impact of grout.

[0037] Meanwhile, the installation space 411 formed by the support frame 410 can provide a stable installation position for the ring bladder 110, improving the reliability of the ring bladder 110 during long-term use. The support frame 410 can be made of metal, polymer, or composite materials, and its specific structure can be grid-like, honeycomb-like, or other structural forms with support functions.

[0038] A guide slope 111 is provided on the side of the annular bladder 110 away from the opening of the grouting pipe 400. When the grout flows along the grouting pipe 400, the guide slope 111 can reduce the flow resistance of the grout to the annular bladder 110, allowing the grout to flow more smoothly towards the pipe opening and be discharged. At the same time, the guide slope 111 can also reduce the local eddy current phenomenon generated during the grout flushing process, improve the stability of pressure transmission, and thus help improve the accuracy of the detection data.

[0039] Multiple first pressure detection probes 120 are installed on the same grouting pipe 400. These probes are spaced apart along the axial and / or circumferential direction of the grouting pipe 400 and are all electrically connected to the display module 300. By coordinating the detection of multiple first pressure detection probes 120, pressure data at different locations can be acquired, thus forming more comprehensive pressure distribution information. When an anomaly occurs at a certain detection location, the reliability of the pressure detection results can be improved by comparing data from other detection locations.

[0040] Each grouting pipe 400 is equipped with a corresponding display module 300, which is electrically connected to the first pressure detection probe 120 on the corresponding grouting pipe 400. This independent display method allows for the separate display of detection data from different grouting pipes 400, facilitating quick assessment of the working status of each pipe by staff.

[0041] In other embodiments, a single display module 300 can be connected to pressure detection probes corresponding to multiple grouting pipes 400 simultaneously for centralized display and unified management.

[0042] The expansion section 240 includes multiple deformable rods 241 and a deformable plate 242. The multiple deformable rods 241 are spaced apart along the circumference of the flexible line 210 and form a ring structure. The deformable plate 242 is connected between the multiple deformable rods 241. When the multiple deformable rods 241 deform, they can drive the deformable plate 242 to unfold and form an umbrella-shaped structure.

[0043] The deformable plate 242 can form a continuous stress-bearing surface to improve the utilization efficiency of the slurry impact force. The deformable plate 242 can be made of flexible diaphragm, elastic plate or fabric material, and the specific material is not limited.

[0044] In its natural state, the multiple deformable rods 241 are arranged to open outwards. The expansion part 240 also includes a drive ring 243, which is sleeved on the outside of the flexible wire 210. The drive ring 243 has a guide slope 2431 on the side facing the deformable plate 242. The drive ring 243 can slide along the axial direction of the flexible wire 210 so that the guide slope 2431 abuts against the multiple deformable rods 241 and drives the multiple deformable rods 241 to retract inwards.

[0045] When the drive ring 243 moves away from the deformation plate 242, the multiple deformation rods 241 can recover their open state by their own elasticity; when the drive ring 243 moves towards the deformation plate 242, the guide slope 2431 gradually squeezes the deformation rods 241, causing them to retract inward, thereby realizing the switching of the expansion part 240 between the unfolded state and the retracted state.

[0046] The drive ring 243 is connected to the output end of the miniature electric actuator 2432, which drives the drive ring 243 to move axially along the flexible wire 210. The miniature electric actuator 2432 enables the automatic unfolding and retraction of the expansion section 240, improving operational convenience.

[0047] In different embodiments, the small electric actuator 2432 can also be replaced by a micro motor drive mechanism, an electromagnetic drive mechanism, a pneumatic drive mechanism, or a hydraulic drive mechanism.

[0048] In different embodiments, the expansion of the balloon 220 can also drive the drive ring 243 to move axially along the flexible wire 210. For example, when the internal pressure of the balloon 220 increases, it generates radial expansion. The expansion force acts on the drive ring 243 through the transmission structure, causing the drive ring 243 to automatically shift, thereby achieving automatic switching of the state of the expansion section 240. This structure reduces the need for independent drive components and simplifies the overall structure.

[0049] When the expansion section 240 is in the deployed state, its maximum outer diameter is greater than that of the bulb 220. With this structural arrangement, the expansion section 240 can form a larger force-bearing area than the bulb 220, so that the pushing force generated by the slurry acts preferentially on the expansion section 240, thereby improving the ability of the second pressure detection component 200 to enter the interior of the leak point 510.

[0050] Meanwhile, after the second pressure detection component 200 enters the leak point 510, the expansion part 240 can also limit and guide the balloon 220, which helps to maintain the stability of the detection position of the balloon 220 inside the leak point 510 and improve the reliability of the detection process.

[0051] In other embodiments, the present invention also provides a method for using the pressure distribution detection device for the combined internal and external pressure sealing of a 500mm foundation pit support, employing the pressure distribution detection device for the combined internal and external pressure sealing of a 500mm foundation pit support as described above, comprising the following steps: S1. The inner grouting pipe 400 and the outer grouting pipe 400 of the foundation pit 500, which are equipped with the first pressure detection component 100, are respectively arranged to correspond to the leak point 510, and the expansion part 240 of the second pressure detection component 200 is in the unfolded state. S2. Perform internal and external combined pressure sealing construction. Under the action of grout pressure, the second pressure detection component 200 moves along the leak point 510 with the grout and enters the interior of the leak point 510. The umbrella-shaped structure opening formed by the expansion part 240 faces the direction of the opening of the leak point 510. S3. During the leak sealing process, the first pressure detection probe 120 is used to detect the pressure data at the pipe openings of the grouting pipe 400 inside the foundation pit 500 and the grouting pipe 400 outside the foundation pit 500, and the second pressure detection probe 230 is used to detect the pressure data inside the leak point 510. S4. The pressure data detected by the first pressure detection probe 120 and the second pressure detection probe 230 are transmitted to the display module 300. The display module 300 synchronously displays the pressure data of the grouting pipe 400 inside the foundation pit 500, the grouting pipe 400 outside the foundation pit 500, and the inside of the leak point 510 to obtain the pressure distribution during the leak sealing process. S5. After completing the pressure test, switch the expansion section 240 to the retracted state and pull the second pressure detection component 200 out from the leak point 510 through the flexible wire 210.

[0052] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A pressure distribution detection device for combined internal and external pressurization and leak sealing in foundation pit support, characterized in that, It includes a first pressure detection component (100) installed at the openings of the grouting pipes (400) on the inner and outer sides of the foundation pit (500), a second pressure detection component (200) for extending into the leak point (510), and a display module (300); The first pressure detection component (100) includes a ring bladder (110) and a first pressure detection probe (120). The ring bladder (110) is covered on the inner wall of the corresponding grouting pipe (400). The ring bladder (110) is filled with liquid. The detection end of the first pressure detection probe (120) extends into the ring bladder (110) and contacts the liquid. The second pressure detection assembly (200) includes a flexible wire (210), a bulb (220), a second pressure detection probe (230), and an expansion section (240). The flexible wire (210) is used to extend into the leak point (510). The bulb (220) is disposed at the end of the flexible wire (210) and is filled with liquid. The detection end of the second pressure detection probe (230) is disposed inside the bulb (220) and is in contact with the liquid. The expansion section (240) is disposed near the bulb (220) of the flexible wire (210). The expansion section (240) can switch between an expanded state and a retracted state. In the expanded state, it forms an umbrella-shaped structure. In the retracted state, it fits against the outside of the flexible wire (210). The opening of the umbrella-shaped structure faces the direction of the opening of the leak point (510). The display module (300) is electrically connected to the first pressure detection probe (120) and the second pressure detection probe (230) corresponding to the grouting pipe (400) on the inner side of the foundation pit (500) and the outer side of the foundation pit (500), respectively, and is used to receive and display the pressure data detected by the first pressure detection probe (120) and the second pressure detection probe (230).

2. The pressure distribution detection device for combined internal and external pressure sealing of foundation pit support according to claim 1, characterized in that, A support frame (410) is fixedly provided on the inner wall of the grouting pipe (400). The support frame (410) is a grid structure. An installation space (411) is formed between the support frame (410) and the inner wall of the grouting pipe (400). The annular bladder (110) is embedded in the installation space (411).

3. The pressure distribution detection device for combined internal and external pressure sealing of foundation pit support according to claim 2, characterized in that, The annular bladder (110) has a guide slope (111) on the side away from the opening of the grouting pipe (400).

4. The pressure distribution detection device for combined internal and external pressure sealing of foundation pit support according to claim 1, characterized in that, Multiple first pressure detection probes (120) are provided on the same grouting pipe (400). The multiple first pressure detection probes (120) are distributed at intervals along the axial and / or circumferential direction of the grouting pipe (400) and are all electrically connected to the display module (300).

5. The pressure distribution detection device for combined internal and external pressure sealing of foundation pit support according to claim 1, characterized in that, Each of the grouting pipes (400) is provided with a corresponding display module (300), and the display module (300) is electrically connected to the first pressure detection probe (120) on the corresponding grouting pipe (400).

6. The pressure distribution detection device for combined internal and external pressure sealing of foundation pit support according to claim 1, characterized in that, The expansion section (240) includes multiple deformable rods (241) and a deformable plate (242). The multiple deformable rods (241) are spaced apart along the circumference of the flexible wire (210) and form a ring structure. The deformable plate (242) is connected between the multiple deformable rods (241). When the multiple deformable rods (241) deform, they can drive the deformable plate (242) to unfold and form an umbrella-shaped structure.

7. The pressure distribution detection device for combined internal and external pressure sealing of foundation pit support according to claim 6, characterized in that, The multiple deformable rods (241) are arranged outward in their natural state. The expansion portion (240) also includes a drive ring (243). The drive ring (243) is sleeved on the outside of the flexible wire (210). The drive ring (243) has a guide slope (2431) on the side facing the deformable plate (242). The drive ring (243) can slide along the axial direction of the flexible wire (210) so that the guide slope (2431) abuts against the multiple deformable rods (241) and drives the multiple deformable rods (241) to retract inward.

8. The pressure distribution detection device for combined internal and external pressure sealing of foundation pit support according to claim 7, characterized in that, The drive ring (243) is connected to the output end of a small electric push rod (2432), which is used to drive the drive ring (243) to move axially along the flexible wire (210).

9. The pressure distribution detection device for combined internal and external pressure sealing of foundation pit support according to claim 1, characterized in that, The maximum outer diameter of the expansion portion (240) when it is in the expanded state is greater than the maximum outer diameter of the sac (220).

10. A method for using a pressure distribution detection device for combined internal and external pressure sealing of foundation pit support, wherein the device is used as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. The grouting pipe (400) inside the foundation pit (500) and the grouting pipe (400) outside the foundation pit (500) equipped with the first pressure detection component (100) are respectively arranged to correspond to the leak point (510), and the expansion part (240) of the second pressure detection component (200) is in the unfolded state. S2. Perform internal and external combined pressure plugging construction. Under the action of grout pressure, the second pressure detection component (200) moves along the leak point (510) with the grout and enters the interior of the leak point (510). The umbrella-shaped structure formed by the expansion part (240) faces the direction of the opening of the leak point (510). S3. During the sealing process, the pressure data at the pipe openings of the grouting pipe (400) inside the foundation pit (500) and the grouting pipe (400) outside the foundation pit (500) are detected using the first pressure detection probe (120), and the pressure data inside the leak point (510) is detected using the second pressure detection probe (230). S4. The pressure data detected by the first pressure detection probe (120) and the second pressure detection probe (230) are transmitted to the display module (300). The display module (300) synchronously displays the pressure data of the grouting pipe (400) inside the foundation pit (500), the grouting pipe (400) outside the foundation pit (500), and the inside of the leak point (510) to obtain the pressure distribution during the leak sealing process. S5. After completing the pressure test, switch the expansion part (240) to the retracted state and pull the second pressure detection component (200) out from the leak point (510) through the flexible wire (210).

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