Device and method for testing waterproof performance of rectangular top pipe joint under multiple working conditions

Abstract

The invention relates to a waterproof performance test device and method for a rectangular top pipe joint under multiple working conditions, and belongs to the technical field of top pipe engineering. A ballast module, an installation module, a disturbance simulation module, a water filling module and a test module are arranged on a base, and the ballast module, the installation module, the disturbance simulation module, the water filling module and the test module are matched with one another; on-site data can be conveniently obtained and accurately represented, the problems that on-site data is difficult to obtain and a test means for representing the construction effect and the joint deformation effect is lacked are solved, and meanwhile, the test method can be used for solving the problem of joint dislocation, opening and torsion caused by different disturbances during later operation after the rectangular top pipe joint is constructed and installed. The waterproof performance of the rectangular top pipe joint is tested, the safety performance control index of the rectangular top pipe joint is determined, the safety stability of the rectangular top pipe joint under various working conditions is controlled, and the safety control problem of the rectangular top pipe joint after disturbance in an underground complex environment is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe jacking engineering, and in particular relates to a device and method for testing the waterproof performance of a rectangular pipe jacking joint under multiple working conditions. Background Art

[0002] Rectangular pipe jacking technology is often involved in the construction of urban underground spaces. However, the F-type socket joint of the rectangular pipe jacking, despite its flexible design, is a weak link in the structure and is prone to waterproof failure due to excessive deformation, affecting normal use and structural safety. This joint relies on the compression of the rubber water stop ring for waterproofing, but after installation, the rubber water stop is blocked, making it difficult to test its stress on site, making it difficult to evaluate its actual application performance.

[0003] At present, there is no unified control index and standard for the anti-seepage deformation of rectangular jacking socket joints, and there are few related experimental studies. The existing tests are mostly focused on the exploration of joint stiffness, which fails to fully reflect the uneven deformation and leakage problems during the construction and operation stages. In addition, the two wedge-shaped rubber water stop rings unique to rectangular jacking joints make their water-stopping characteristics and ability to respond to external disturbances different from those of general tunnel joints, which urgently requires a dedicated test device and method. Therefore, a waterproof performance test device and method suitable for rectangular jacking joints under multiple working conditions were developed to solve the problems of difficulty in obtaining on-site data and lack of test means to characterize construction effects and joint deformation. Summary of the invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a device and method for testing the waterproof performance of rectangular jacking joints under multiple working conditions, which solves the problems in the prior art of difficulty in obtaining on-site data and lack of test means to characterize construction effects and joint deformation effects under multiple working conditions of rectangular jacking joints.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A rectangular jacking pipe joint waterproof performance test device under multiple working conditions, comprising a base and a ballast module, an installation module, a disturbance simulation module, a water filling module, and a test module respectively arranged on the base, wherein the ballast module, the installation module, the disturbance simulation module, the water filling module, and the test module are respectively used to simulate the cover pressure in actual construction, simulate the joint installation process, obtain the response of the joint under different working conditions, simulate the waterproof performance under different water pressure conditions, and evaluate the waterproof performance of the joint; the ballast module, the installation module, the disturbance simulation module, the water filling module, and the test module cooperate with each other to facilitate the acquisition and accurate characterization of field data.

[0007] As a further solution of the present invention, the ballast module includes a ballast plate and a pressure-bearing plate respectively arranged above the base, and the ballast plate and the pressure-bearing plate are respectively arranged away from and close to the base.

[0008] As a further solution of the present invention, the mounting module includes a hydraulic sliding device and a wedge-shaped rubber, the wedge-shaped rubber is arranged in the middle of the pressure plate, and the hydraulic sliding device is arranged between the base and the pressure plate.

[0009] As a further solution of the present invention, the disturbance simulation module includes a displacement adjustment plate arranged on the pressure plate, a stiffening rib arranged on the displacement adjustment plate, a vertical loading jack and a clamp, the two ends of the vertical loading jack are respectively connected to the clamp and the displacement adjustment plate, and the two ends of the clamp are respectively connected to the vertical loading jack and the ballast plate.

[0010] As a further solution of the present invention, the water filling module includes a water-stop rubber, a water injection and pressure device and an operating window. The water-stop rubber is arranged around the pressure plate. The water-stop rubber is divided into a first cavity structure and a second cavity structure by a wedge-shaped rubber. The water injection and pressure device passes through the water-stop rubber and is located in the first cavity structure formed by the water-stop rubber and the wedge-shaped rubber. The operating window is arranged on the upper part of the displacement adjustment plate.

[0011] As a further solution of the present invention, the test module includes a pressure gauge, a high-definition camera, a standard grid and an observation scale. The pressure gauge is arranged on the water injection and pressurizing device, the high-definition camera is arranged under the ballast plate, the observation scale is arranged in the water injection and pressurizing device, the observation scale is used to measure the liquid leakage, and the standard grid is located in the second cavity structure.

[0012] As a further solution of the present invention, the water-stopping rubber is adhered to the pressure plate, and its thickness is greater than the maximum adjustment displacement of the wedge-shaped rubber and the displacement adjustment plate.

[0013] As a further solution of the present invention, the hydraulic sliding device includes a hydraulic guide rail and a sliding block, the hydraulic guide rail is fixed on the base, the sliding block is fixed on the side of the pressure plate, and the hydraulic guide rail is provided with a dynamometer, which is used to test the change in the size of the installation force.

[0014] A method for testing the waterproof performance of a rectangular jacking pipe joint under multiple working conditions comprises the following steps:

[0015] S1: Processing and assembly of test components, connection of pressure plate with water-stop rubber and wedge rubber, arrangement of pressure plate on hydraulic sliding device, rigid connection of vertical loading jack, fixture with ballast plate and displacement adjustment plate, arrangement of standard grid in test module, observation scale, high-definition camera, water injection pressurization device and pressure gauge, etc.;

[0016] S2: The ballast plate and the displacement adjustment plate are installed at preset positions by adjusting the hydraulic sliding device to push the pressure plate to simulate the installation process of the steel sleeve ring and the wedge-shaped rubber ring during the pipe joint docking process;

[0017] S3: After installation, the joint displacement, opening and twisting process in the operation process are simulated by adjusting the vertical loading jack: when the jacking joint is displaced by z, Δx1=Δx2=z at the vertical loading jack; when the jacking joint is opened at an angle θ, Δx1=L1sinθ and Δx2=L2sinθ at the vertical loading jack; when the jacking joint is twisted, the vertical loading jack is divided into different sections, and the opening displacement of different sections is calculated separately;

[0018] S4: Open the operation window, seal the installation gap, and fill the installation gap by pouring glass glue or other sealing materials to ensure that the installation gap is dense;

[0019] S5: Open the water injection and pressure device to inject water into the water injection cavity. After the water injection and exhaust are completed, seal the operation window, ensure that the window is airtight, and then pressurize the water injection device. Each stage of pressure increase is 5kPa. The pressure gauge is kept stable for 5 minutes at each stage. The color test method is carried out. The color development and color development area on the standard grid are identified by a high-definition camera. The water leakage is observed by the color development and the pressure gauge value until water leakage occurs. The water pressure at this level is the corresponding critical water pressure under this working condition. At the same time, the wet stain area and the penetration rate are determined by combining the color development area and the observation scale. After the determination is completed, the water pressure is further increased according to the waterproof grade requirements of the test piece until the wet stain area and the penetration rate exceed the corresponding waterproof standard;

[0020] S6: Repeat steps S3-S5 to test the penetration pressure, wet stain area and penetration rate of the jacking joint under different displacements, openings and torsions.

[0021] The beneficial effects of the present invention are:

[0022] By arranging a ballast module, an installation module, a disturbance simulation module, a water filling module and a test module on the base respectively, the ballast module, the installation module, the disturbance simulation module, the water filling module and the test module are respectively used to simulate the cover pressure in actual construction, simulate the joint installation process, obtain the response of the joint under different working conditions, simulate the waterproof performance under different water pressure conditions and evaluate the waterproof performance of the joint. The ballast module, the installation module, the disturbance simulation module, the water filling module and the test module are coordinated with each other, so that the field data can be easily obtained and accurately characterized, which solves the problems of difficulty in obtaining field data and lack of experimental means for characterizing the construction effect and the deformation of the joint. At the same time, the waterproof performance of the rectangular jacking joint can be tested for the joint dislocation, opening and torsion under different disturbances in the later operation after the construction and installation of the rectangular jacking joint, the safety performance control index of the rectangular jacking joint can be determined, the safety stability of the rectangular jacking joint under various working conditions can be controlled, the safety control problem of the rectangular jacking joint after disturbance in the underground complex environment can be solved, the leakage deformation safety control index of the rectangular jacking joint can be effectively obtained, and the control risk can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the hydraulic sliding device of the present invention;

[0026] Figure 3 It is a schematic diagram of the installation and matching of the wedge-shaped rubber and the water-stop rubber of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the water injection pressurizing device of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the disturbance simulation module of the present invention;

[0029] Figure 6 It is a schematic diagram of the cross-sectional distribution of the vertical loading jack of the present invention;

[0030] Figure 7 It is a schematic diagram of the displacement, opening and twisting of the jacking joint of the present invention.

[0031] Description of main component symbols:

[0032] In the figure: 1. ballast plate; 2. loading device; 3. fixture; 4. vertical loading jack; 5. stiffening rib; 6. displacement adjustment plate; 7. operation window; 8. base; 9. hydraulic sliding device; 10. wedge rubber; 11. water-stop rubber; 12. water injection cavity; 13. pressure plate; 14. installation gap; 15. water injection pressurizing device; 16. high-definition camera; 17. observation scale; 18. dynamometer; 19. pressure gauge; 20. standard grid; 901. hydraulic guide rail; 902. sliding block; 1501. water pressure pump; 1502. catheter. DETAILED DESCRIPTION

[0033] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0034] See also Figure 1-7 The present embodiment provides a device and method for testing the waterproof performance of a rectangular jacking joint under multiple working conditions, wherein the device comprises a base 8 and a ballast module, an installation module, a disturbance simulation module, a water filling module, and a test module respectively arranged on the base 8, wherein the ballast module, the installation module, the disturbance simulation module, the water filling module, and the test module are respectively used to simulate the earth cover pressure in actual construction, simulate the joint installation process, obtain the reaction of the joint under different working conditions, simulate the waterproof performance under different water pressure conditions, and evaluate the waterproof performance of the joint; the ballast module, the installation module, the disturbance simulation module, the water filling module, and the test module cooperate with each other to facilitate the acquisition and accurate characterization of field data;

[0035] It should be noted that in the ballast module here, the cover pressure data is collected in real time by sensors, and the data at different depths and pressures are recorded to simulate the cover pressure in actual construction; in the installation module, each stage of the joint installation process is recorded, including parameters such as installation position, angle and torque, to ensure the accuracy of the simulated joint installation process; in the disturbance simulation module, by simulating different types of construction disturbances (such as excavation, additional loads, etc.), data during the disturbance process is collected, including the frequency, amplitude and duration of the disturbance, and these data are used to analyze the impact of the disturbance on the installation stability and waterproof performance of the joint; in the water filling module, by controlling different water pressure conditions During the water filling process under the condition of water pressure, the water pressure and flow data are monitored in real time to simulate the water pressure changes in the actual project. These data are collected to evaluate the waterproof performance of the joint under different water pressure conditions. In the test module, the data collected by the above module are used to test the waterproof performance of the joint, including joint deformation, sealing performance and waterproof effect. Various data in the test process are recorded, such as joint deformation, penetration, penetration rate, etc. In this way, the test device can not only simulate the actual construction conditions, but also provide more accurate waterproof performance evaluation through data analysis, thereby effectively solving the problems of difficulty in obtaining on-site data and lack of test means to characterize the construction effect and joint deformation.

[0036] There are no unified control indicators and standards for the anti-seepage deformation of rectangular jacking socket joints, and there are few related experimental studies. The existing tests are mostly focused on exploring the joint stiffness, which fails to fully reflect the uneven deformation and leakage problems during the construction and operation stages. In addition, the two wedge-shaped rubber water stop rings unique to the rectangular jacking joint make its water-stopping characteristics and ability to respond to external disturbances different from those of general tunnel joints. There is an urgent need for dedicated test equipment and methods to solve the difficulties in obtaining on-site data and the lack of test methods to characterize the construction effect and joint deformation.

[0037] In order to solve the above problems, in this embodiment, a ballast module, an installation module, a disturbance simulation module, a water-filling module and a test module are respectively arranged on the base 8. The ballast module, the installation module, the disturbance simulation module, the water-filling module and the test module are respectively used to simulate the cover pressure in actual construction, simulate the joint installation process, obtain the response of the joint under different working conditions, simulate the waterproof performance under different water pressure conditions and evaluate the waterproof performance of the joint. The ballast module, the installation module, the disturbance simulation module, the water-filling module and the test module are coordinated with each other to facilitate the acquisition and accurate characterization of field data, thereby solving the problems of difficulty in acquiring field data and lack of experimental means to characterize construction effects and joint deformation effects.

[0038] Furthermore, when the ballast module, the installation module, the disturbance simulation module, the water filling module and the test module cooperate with each other to solve the problems in the prior art of difficulty in obtaining on-site data and lack of experimental means for characterizing construction effects and joint deformation under multiple working conditions of rectangular jacking joints, in one embodiment, the ballast module includes a ballast plate 1 and a pressure plate 13 respectively arranged above the base 8, and the ballast plate 1 and the pressure plate 13 are respectively arranged away from and close to the base 8. The ballast module simulates the cover pressure in actual construction by arranging the ballast plate 1 and the pressure plate 13, and provides a real stress environment for the joint. The design of the ballast module makes it possible to accurately control the pressure, thereby more accurately simulating the construction pressure under different working conditions and obtaining real pressure data on site;

[0039] When simulating the soil covering pressure in actual construction, the ballast module is composed of a ballast plate 1 and a pressure plate 13. The two plates are respectively arranged at different positions above the base 8. The ballast plate 1 is located on one side of the base 8, away from the base 8, and the pressure plate 13 is located on the other side of the base 8, close to the base 8. The ballast plate 1 simulates the pressure of the soil on the pipe joint in actual construction by applying a certain weight on it (for example, the ballast servo applies pressure). The pressure plate 13 is used to support the weight applied by the ballast plate 1 and transfer it to the base 8. When the weight applied to the ballast plate 1 increases, it will generate pressure on the pressure plate 13. This pressure simulates the soil covering pressure of the soil on the pipe joint in actual construction. The ballast module can simulate the pressure of soil at different depths by adjusting the weight on the ballast plate 1, thereby simulating different soil covering thicknesses in actual construction. By changing the weight of the ballast plate 1, the soil covering pressure under different working conditions can be simulated, such as pressure conditions under different soil types, different construction depths and different environmental conditions;

[0040] The installation module includes a hydraulic sliding device 9 and a wedge-shaped rubber. The wedge-shaped rubber is arranged in the middle of the pressure plate 13, and the hydraulic sliding device 9 is arranged between the base 8 and the pressure plate 13; the hydraulic sliding device 9 and the wedge-shaped rubber of the installation module can simulate the installation process of the joint, ensuring that the installation state of the joint in the test is consistent with the actual situation on site. This design makes the installation action in the test process more standardized and controllable, improves the reliability of the data, and preliminarily positions the joint to the expected installation position through the hydraulic sliding device 9;

[0041] The wedge-shaped rubber is placed in the middle of the pressure plate 13, and its shape and size are designed to simulate the stress conditions of the actual joint during the installation process. When the hydraulic sliding device 9 starts to work, the wedge-shaped rubber will be subjected to pressure and deformed, simulating the compression and tensile forces on the joint during on-site installation. The hydraulic sliding device 9 is arranged between the base 8 and the pressure plate 13, and is powered by the hydraulic system. The hydraulic system can accurately control the pressure and speed, so that the pressure plate 13 slides relative to the base 8, simulating the relative displacement of the joint during the installation process. During the compression simulation, the hydraulic system is started to apply pressure to the wedge-shaped rubber to simulate the compression process of the joint during on-site installation to ensure the tight connection between the joint and the pipeline; in addition, in order to improve the reliability and repeatability of the test, compression and tension simulations can be performed multiple times to ensure the performance of the joint under various working conditions. During the simulated installation process, the installation module will synchronously record relevant data, such as pressure, displacement, deformation, etc., in order to analyze the installation performance of the joint. These data can be compared with the on-site data to verify the validity and accuracy of the test results;

[0042] The disturbance simulation module includes a displacement adjustment plate 6 arranged on the pressure plate 13, a stiffening rib 5 arranged on the displacement adjustment plate 6, a vertical loading jack 4 and a clamp 3, the two ends of the vertical loading jack 4 are respectively connected to the clamp 3 and the displacement adjustment plate 6, and the two ends of the clamp 3 are respectively connected to the vertical loading jack 4 and the ballast plate 1; the disturbance simulation module can simulate the displacement and disturbance of the joint under different working conditions through the combination of the displacement adjustment plate 6, the stiffening rib 5, the vertical loading jack 4 and the clamp 3. When the jacking joint is displaced z, Δx1=Δx2=z at the vertical loading jack; when the jacking joint is opened When the angle is θ, Δx1=L1sinθ, Δx2=L2sinθ at the vertical loading jack; when the jacking joint is twisted, the vertical loading jack is divided into different sections, and the opening and dislocation of different sections are calculated separately; the design of this module allows researchers to adjust and simulate various disturbance factors in actual construction, such as soil displacement, earthquake, etc., so as to better understand the impact of these factors on waterproof performance; the clamp 3 is connected to the ballast plate 1 by welding, and the base of the vertical loading jack 4 is fixed on the clamp 3. When the vertical loading jack 4 is operated and displaced, the clamp 3 is fixed to the upper ballast plate 1;

[0043] First, according to the working conditions to be simulated, set the disturbance parameters, such as displacement, loading force, loading rate, etc. The displacement adjustment plate 6 cooperates with the vertical loading jack 4 and the clamp 3 through the stiffening rib 5 to accurately control the displacement of the joint. By adjusting the displacement of the displacement adjustment plate 6, the different displacement conditions that the joint may encounter in actual working conditions are simulated. The vertical loading jack 4 is fixed to the clamp 3 through the base, and the clamp 3 is connected to the ballast plate 1 by welding. When the vertical loading jack 4 is operated and displaced, the clamp 3 and the upper ballast plate 1 remain fixed, so as to ensure that the joint is connected during loading. The stability of the head is tested by applying different forces to the joint through 4 vertical loading jacks to simulate external disturbances such as soil displacement and additional loads. The displacement, deformation and stress changes of the joint are monitored in real time using sensors and measuring equipment. During the simulation, the displacement, deformation, stress and other data of the joint are recorded to analyze the response characteristics of the joint. By comparing the data under different working conditions, researchers can evaluate the waterproof performance and structural stability of the joint under different disturbance factors. In this way, the disturbance simulation module can simulate a variety of working conditions and obtain the response of the joint under different working conditions.

[0044] The water filling module includes a water-stop rubber 11, a water injection and pressurizing device 15 and an operating window 7. The water-stop rubber 11 is arranged around the pressure plate 13. The water-stop rubber 11 is divided into a first cavity structure and a second cavity structure by a wedge-shaped rubber. The water injection and pressurizing device 15 passes through the water-stop rubber 11 and is located in the first cavity structure formed by the water-stop rubber 11 and the wedge-shaped rubber. The operating window 7 is arranged on the upper part of the displacement adjustment plate 6. The water filling module can simulate the waterproof performance under different water pressure conditions through the design of the water-stop rubber 11, the water injection and pressurizing device 15 and the operating window 7. The water-stop rubber 11 The first cavity structure and the second cavity structure are set to form, so that the water pressure and observation conditions in the test can be controlled respectively, and the waterproof effect of the joint can be accurately evaluated; the water-stopping rubber 11 is pasted on the pressure plate 13, and the thickness is greater than the maximum adjustment displacement of the wedge-shaped rubber and the displacement adjustment plate 6, so as to ensure that the cavity water pressure is maintained after the displacement adjustment, and there is no leakage from the water-stopping rubber 11, and a gap is set between the water-stopping rubber 11 and the wedge-shaped rubber. When the wedge-shaped rubber is compressed, it does not contact the water-stopping rubber 11, and the gap between the wedge-shaped rubber and the water-stopping rubber 11 needs to be sealed in advance through the operating window 7 before water injection;

[0045] The water-stop rubber 11 is arranged around the pressure plate 13, and is divided into two cavity structures by the wedge-shaped rubber, namely the first cavity structure and the second cavity structure. This design allows independent control of water pressure in different cavities. The water injection and pressurizing device 15 runs through the water-stop rubber 11 and is located in the first cavity structure. When water is injected into the first cavity structure and pressure is applied by the water injection and pressurizing device 15, different water pressure conditions can be simulated. The water pressure of this cavity can be adjusted independently to simulate different waterproof performance test conditions. The second cavity structure can be sealed by the operating window 7 to ensure that water does not leak from the water-stop rubber 11 during the test. The second cavity structure can be used to observe and measure parameters such as joint deformation. The operating window 7 is set on the upper part of the displacement adjustment plate 6 to seal the gap between the water-stop rubber 11 and the wedge-shaped rubber before and after the test. Before the test, the gap is sealed through the operating window 7 to ensure that water does not leak from the water-stop rubber 11 during water injection. The gap between the wedge-shaped rubber and the water stop rubber 11 is leaked, and water of different pressures is injected into the first cavity structure through the water injection pressurizing device 15 to simulate different water pressure conditions. By controlling the water pressure and observation conditions in the second cavity structure, the waterproof effect of the joint can be accurately evaluated. During the test, the wedge-shaped rubber is compressed by the displacement adjustment plate 6 to simulate the deformation of the joint under different loads. Since the thickness of the water-stop rubber 11 is greater than the maximum adjustment displacement of the wedge-shaped rubber and the displacement adjustment plate 6, it can be ensured that the water pressure in the cavity can still be maintained after the displacement adjustment. In addition, water injection is carried out through the cooperation of the water pressure pump 1501 and the conduit 1502, and the pressure gauge 19 is installed on the water pressure pump 1501. The water pressure pump 1501 is also provided with a standard grid 20. By designing the standard grid 20 on the pump, the uniformity and standardization of data collection can be ensured for each test, which is conducive to improving data quality and making it easier to compare and analyze data under different working conditions.

[0046] The test module includes a pressure gauge 19, a high-definition camera 16, a standard grid 20 and an observation scale 17. The pressure gauge 19 is arranged on the water injection and pressurizing device 15, the high-definition camera 16 is arranged below the ballast plate 1, and the observation scale 17 is arranged in the water injection and pressurizing device 15. The observation scale 17 is used to measure the amount of liquid leakage, and the standard grid 20 is located in the second cavity structure; the test module can monitor and record the waterproof performance of the joint in real time through the coordinated use of the pressure gauge 19, the high-definition camera 16, the standard grid 20 and the observation scale 17. The pressure gauge 19 and the observation scale 17 are used to measure the water pressure and leakage, and the high-definition camera 16 and the standard grid 20 are used to observe the deformation and water leakage of the joint;

[0047] The pressure gauge 19 is used to monitor the water pressure in the water injection and pressurizing device 15 in real time. By comparing the set working pressure and the actual water pressure, the sealing effect of the joint under a specific pressure can be evaluated. The observation scale 17 is used to measure the liquid leakage, that is, the sealing performance of the joint is comprehensively evaluated by the leakage pressure, penetration rate, penetration amount, and structural wet stain area through the joint in the water injection and pressurizing device 15. If the leakage is lower than a preset threshold, it can be considered that the waterproof performance requirement of the joint is met. The high-definition camera 16 cooperates with the standard grid 20 to accurately capture the deformation of the joint. By comparing the standard grid 20 and the deformation image of the joint after being subjected to force, the deformation degree of the joint can be quantitatively analyzed.

[0048] When evaluating the waterproof performance of the joint specifically: first set the appropriate pressure and flow, start the test, ensure that all test equipment is correctly installed and calibrated, the pressure gauge 19 records the water pressure data in real time, the high-definition camera 16 captures the real-time image of the joint and compares it with the standard grid 20 to monitor the deformation, the observation scale 17 records the liquid leakage, and performs real-time analysis on the collected data, including water pressure changes, leakage and deformation. According to the set standards, judge whether the waterproof performance of the joint meets the requirements. Combined with the water pressure, leakage and deformation data, evaluate the overall waterproof effect of the joint. If the joint is found to have leakage or excessive deformation, the construction plan can be adjusted or repaired in time. Prepare a detailed test report, including test conditions, test data, analysis results and final evaluation. According to the test results, propose improvement measures or optimization suggestions. Through such a comprehensive evaluation method, the test module can evaluate the waterproof performance of the rectangular jacking joint.

[0049] In addition, it should be noted that the hydraulic sliding device 9 includes a hydraulic guide rail 901 and a sliding block 902. The hydraulic guide rail 901 is fixed on the base 8, and the sliding block 902 is fixed on the side of the pressure plate 13. The hydraulic guide rail 901 is provided with a dynamometer 18, and the dynamometer 18 is used to test the change in the size of the installation force. The vertical loading jack 4 is fixedly connected to the displacement adjustment plate 6. Through the fixed connection between the vertical loading jack 4 and the displacement adjustment plate 6, the opening, displacement and torsion of the jacking joint can be accurately simulated, so as to more accurately obtain on-site data, and provide a reliable basis for analyzing and evaluating the construction effect. It can be set to four channels or multiple channels. The design of four channels or multiple channels can simulate multiple working conditions at the same time, improve the efficiency of the test, reduce the number of tests, save time and cost, and derive the calculation formula combined with geometric conversion to input the vertical loading jack 4 to simulate the opening, displacement and torsion of the jacking joint. The operation window 7 is set above the wedge-shaped rubber after the test piece is installed. The displacement adjustment plate 6 is closed after water is injected and exhausted, and a rubber seal is used. Phenolphthalein solution is applied to the standard grid 20 of the inner cavity of the wedge-shaped rubber, and alkaline aqueous solution is used for water injection. The beginning of leakage is reflected by color development. By applying phenolphthalein solution and injecting alkaline aqueous solution, the leakage of the joint can be monitored in real time, and the wet stain area is reflected by color development, so as to quickly feedback the sealing performance of the joint. The wet stain area is reflected by identifying the color development area through data processing after real-time shooting by the high-definition camera 16. An observation ruler 17 is pasted inside the water injection and pressurizing device 15, and the leakage rate is calculated and determined in combination with the timing function of the high-definition camera 16. The accuracy and repeatability of the test conditions are ensured by the coordinated use of various modules, thereby improving the accuracy and reliability of the data. The modular design makes the assembly and operation of the device easier, and it is convenient for researchers to quickly adjust the test conditions. The device can simulate a variety of working conditions and is suitable for rectangular jacking joints of different types and sizes, and has a wide applicability.

[0050] A method for testing the waterproof performance of a rectangular jacking pipe joint under multiple working conditions comprises the following steps:

[0051] S1: Processing and assembly of test components, the pressure plate 13 is connected with the water-stop rubber 11 and the wedge-shaped rubber, the pressure plate 13 is arranged on the hydraulic sliding device 9, the vertical loading jack 4, the fixture 3 is rigidly connected with the ballast plate 1 and the displacement adjustment plate 6, and the standard grid 20, the observation scale 17, the high-definition camera 16, the water injection pressurization device 15 and the pressure gauge are arranged in the test module; in addition, in order to ensure the accuracy and repeatability of the test, a stable platform and equipment are provided for subsequent tests, and by accurately processing and assembling the test components, the pipe joint docking process in real conditions can be simulated, providing a basis for obtaining accurate test data;

[0052] S2: The ballast plate 1 and the displacement adjustment plate 6 are preset at the installation spacing, and the hydraulic sliding device 9 is adjusted to push the pressure plate 13 to simulate the installation process of the steel sleeve ring and the wedge-shaped rubber 10 circles during the pipe joint docking process. Here, the installation process of the steel sleeve ring and the wedge-shaped rubber 10 circles during the pipe joint docking process is simulated to ensure the accuracy of the simulation. By presetting the position and adjusting the hydraulic sliding device 9, different docking conditions can be simulated to provide a basis for analyzing the waterproof performance of the joint under different conditions;

[0053] S3: After installation, the joint displacement, opening and twisting process in the operation process are simulated by adjusting the vertical loading jack 4: when the jacking joint is displaced by z, Δx1=Δx2=z at the vertical loading jack 4; when the jacking joint is opened at an angle θ, Δx1=L1sinθ and Δx2=L2sinθ at the vertical loading jack 4; when the jacking joint is twisted, the vertical loading jack 4 is divided into different sections, and the opening and dislocation of different sections are calculated separately; various working conditions that the jacking joint may encounter in the operation process are simulated here, such as displacement, opening and twisting. By adjusting the vertical loading jack 4, different deformation conditions of the joint can be simulated, so as to obtain the waterproof performance data under different working conditions, such as Figure 6-Figure 7 ;

[0054] S4: Open the operation window 7, seal the installation gap 14, and fill the installation gap 14 with glass glue or other sealing materials to ensure that the installation gap 14 is dense. In order to ensure the sealing of the installation gap 14 during the test and avoid test errors, the sealing of the installation gap 14 can be ensured by pouring glass glue or other sealing materials, thereby ensuring the accuracy of the test data;

[0055] S5: Open the water injection pressurizing device 15 to inject water into the water injection cavity 12. After the water injection and exhaust are completed, seal the operation window 7 to ensure that the window is airtight and then pressurize the water injection device. Each stage of pressurization is 5kPa. The pressure gauge 19 is maintained stable for 5 minutes at each stage. The color display and color display area on the standard grid 20 are identified by the high-definition camera 16. The water leakage is observed by the color display and the value of the pressure gauge 19 until water leakage occurs. The water pressure at this stage is the corresponding critical water pressure under this working condition. At the same time, the wet stain area and the penetration rate are determined by combining the color display area and the observation scale 17. After the determination is completed Further increase the water pressure, according to the waterproof grade requirements of the test piece, until the wet stain area and penetration rate exceed the corresponding waterproof standard, where level one: no water seepage allowed; level two: the maximum area of ​​a single wet stain is 0.1m2, and the average water leakage is 0.05L / (m2·d); level three: the maximum area of ​​a single wet stain is 0.3m2; level four: the average water leakage is 2L / (m2·d). By injecting water and pressurizing, observing and recording the water leakage of the joint, the critical water pressure can be determined. By increasing the pressure step by step and observing the water leakage, the critical water pressure under different working conditions can be determined, thereby evaluating the waterproof performance of the joint;

[0056] S6: Repeat steps S3-S5 to test the penetration pressure, wet stain area and penetration rate of the jacking joint under different displacement, opening and torsion. Through repeated tests, the penetration pressure, wet stain area and penetration rate under different displacement, opening and torsion conditions are obtained. Through multiple tests, the waterproof performance of the joint under different working conditions can be fully understood, providing a reference for construction and design.

[0057] This test method provides a reliable means for obtaining comprehensive field data by accurately simulating actual working conditions. It also provides an effective test method for characterizing construction effects and joint deformation. Through the design of the above steps, the construction and design of rectangular jacking joints can be better guided to improve their waterproof performance and reliability.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A multi-condition waterproof performance test device for rectangular jacking joints, characterized in that: It includes a base and a ballast module, an installation module, a disturbance simulation module, a water filling module and a test module respectively arranged on the base, wherein the ballast module, the installation module, the disturbance simulation module, the water filling module and the test module are respectively used to simulate the cover pressure in actual construction, simulate the joint installation process, obtain the response of the joint under different working conditions, simulate the waterproof performance under different water pressure conditions and evaluate the waterproof performance of the joint; the ballast module, the installation module, the disturbance simulation module, the water filling module and the test module cooperate with each other to facilitate the acquisition and accurate characterization of field data.

2. A multi-condition waterproof performance test device for rectangular jacking joints according to claim 1, characterized in that: The ballast module includes a ballast plate and a pressure-bearing plate respectively arranged above the base, and the ballast plate and the pressure-bearing plate are respectively arranged away from and close to the base.

3. A rectangular jacking joint waterproof performance test device under multiple working conditions according to claim 2, characterized in that: The mounting module comprises a hydraulic sliding device and a wedge-shaped rubber, wherein the wedge-shaped rubber is arranged in the middle of the pressure-bearing plate, and the hydraulic sliding device is arranged between the base and the pressure-bearing plate.

4. A rectangular jacking joint waterproof performance test device under multiple working conditions according to claim 3, characterized in that: The disturbance simulation module includes a displacement adjustment plate arranged on the pressure plate, a stiffening rib arranged on the displacement adjustment plate, a vertical loading jack and a clamp, wherein two ends of the vertical loading jack are respectively connected to the clamp and the displacement adjustment plate, and two ends of the clamp are respectively connected to the vertical loading jack and the ballast plate.

5. A multi-condition waterproof performance test device for rectangular jacking joints according to claim 4, characterized in that: The water filling module includes a water-stop rubber, a water injection and pressurizing device and an operating window. The water-stop rubber is arranged around the pressure plate. The water-stop rubber is divided into a first cavity structure and a second cavity structure by a wedge-shaped rubber. The water injection and pressurizing device passes through the water-stop rubber and is located in the first cavity structure formed by the water-stop rubber and the wedge-shaped rubber. The operating window is arranged on the upper part of the displacement adjustment plate.

6. A rectangular jacking joint waterproof performance test device under multiple working conditions according to claim 5, characterized in that: The test module includes a pressure gauge, a high-definition camera, a standard grid and an observation scale. The pressure gauge is arranged on the water injection and pressurizing device, the high-definition camera is arranged under the ballast plate, the observation scale is arranged in the water injection and pressurizing device, the observation scale is used to measure the liquid leakage, and the standard grid is located in the second cavity structure.

7. A multi-condition waterproof performance test device for rectangular jacking joints according to claim 5, characterized in that: The water-stopping rubber is adhered to the pressure-bearing plate, and its thickness is greater than the maximum adjustment displacement of the wedge-shaped rubber and the displacement adjustment plate.

8. The multi-condition waterproof performance test device for rectangular jacking joints according to claim 3 is characterized in that: The hydraulic sliding device includes a hydraulic guide rail and a sliding block, wherein the hydraulic guide rail is fixed on a base, and the sliding block is fixed on the side of a pressure plate. The hydraulic guide rail is provided with a dynamometer, and the dynamometer is used to test the change in the size of the installation force.

9. A method for testing the waterproof performance of a rectangular pipe jacking joint under multiple working conditions, based on a device for testing the waterproof performance of a rectangular pipe jacking joint under multiple working conditions as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Processing and assembly of test components, connection of pressure plate with water-stop rubber and wedge rubber, arrangement of pressure plate on hydraulic sliding device, rigid connection of vertical loading jack, fixture with ballast plate and displacement adjustment plate, arrangement of standard grid in test module, observation scale, high-definition camera, water injection pressurization device and pressure gauge, etc.; S2: The ballast plate and the displacement adjustment plate are installed at preset positions by adjusting the hydraulic sliding device to push the pressure plate to simulate the installation process of the steel sleeve ring and the wedge-shaped rubber ring during the pipe joint docking process; S3: After installation, the joint displacement, opening and twisting process in the operation process are simulated by adjusting the vertical loading jack: when the jacking joint is displaced by z, Δx1=Δx2=z at the vertical loading jack; when the jacking joint is opened at an angle θ, Δx1=L1sinθ and Δx2=L2sinθ at the vertical loading jack; when the jacking joint is twisted, the vertical loading jack is divided into different sections, and the opening displacement of different sections is calculated separately; S4: Open the operation window, seal the installation gap, and fill the installation gap by pouring glass glue or other sealing materials to ensure that the installation gap is dense; S5: Open the water injection and pressure device to inject water into the water injection cavity. After the water injection and exhaust are completed, seal the operation window, ensure that the window is airtight, and then pressurize the water injection device. Each stage of pressure increase is 5kPa. The pressure gauge is kept stable for 5 minutes at each stage. The color test method is carried out. The color development and color development area on the standard grid are identified by a high-definition camera. The water leakage is observed by the color development and the pressure gauge value until water leakage occurs. The water pressure at this level is the corresponding critical water pressure under this working condition. At the same time, the wet stain area and the penetration rate are determined by combining the color development area and the observation scale. After the determination is completed, the water pressure is further increased according to the waterproof grade requirements of the test piece until the wet stain area and the penetration rate exceed the corresponding waterproof standard; S6: Repeat steps S3-S5 to test the penetration pressure, wet stain area and penetration rate of the jacking joint under different displacements, openings and torsions.

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