A bladder-type joint pipe simulation casting test device and method

Abstract

This invention relates to the field of concrete cut-off wall construction, specifically disclosing a simulated pouring test device and method for a bladder-type joint pipe. The device includes a base, a reaction device, a temperature control device, and a pressurized bladder-type joint pipe. The base provides support, and the pouring equipment within the base is used to inject concrete into the device. The reaction device applies and maintains the concrete load, and the temperature control device regulates the curing environment temperature. The pressurized bladder-type joint pipe is placed within the cavity, and detection components are installed on its outer surface. The corresponding method simulates the pouring process through graded loading and the curing process through constant temperature and load holding, monitoring the stress and deformation parameters of the joint pipe throughout the process. This invention solves the problem of the lack of specific experimental verification methods for the stress characteristics of pressurized bladder-type joint pipes during pouring, improves the realism of construction condition simulation and the accuracy of test data, and provides reliable experimental support for its engineering applications.

Description

Technical Field

[0001] This invention relates to the field of concrete anti-seepage wall construction technology, specifically to a bladder-type joint pipe simulated casting test device and method. Background Technology

[0002] Concrete cutoff walls, as a common type of underground concealed engineering project, primarily function to prevent water seepage from the foundation of hydraulic structures, preventing phenomena such as piping and soil erosion that could affect the overall performance, safety, and service life of the structure. The connection technology between wall sections is crucial to ensuring the overall seepage prevention effect. The "joint pipe method" is currently an advanced technology for joint treatment in cutoff wall construction, particularly suitable for projects with tight schedules and high-strength wall materials. The pressurized bladder-type joint pipe is an inflatable rubber container with internally distributed steel fibers, fundamentally solving construction problems such as high transportation costs and the tendency for "cast pipe" phenomena that traditional joint pipes cannot address. However, as a new type of joint pipe, the stress distribution and deformation of the pressurized bladder-type joint pipe during concrete pouring are still unclear, lacking necessary theoretical and technical support in actual construction.

[0003] Therefore, in order to systematically explore the feasibility of pressurized bladder-type connector pipes in practical engineering, a bladder-type connector pipe simulation casting test device and method are needed. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a simulated casting test device and method for bladder-type joint pipes, solving the problem of lack of testing methods for stress deformation of pressurized bladder-type joint pipes, and improving the simulation realism and test reliability.

[0005] To achieve the above objectives, the present invention proposes a bladder-type joint pipe simulated casting test device, including a base, a reaction device, a constant temperature device, and a pressurized bladder-type joint pipe. The base includes a fixed base, side plates, and a pouring device. Supports are provided on both sides of the fixed base. The side plates are connected to the fixed base by bolts. The pouring device is used to inject concrete into the device. The reaction device includes a reaction support, a top plate, and a hydraulic jack. The reaction support is welded and fixed to the fixed base. The top plate is welded and fixed by fixing bolts. The fixing bolts pass through the top plate and are threaded with fixing nuts. The hydraulic jack is disposed between the reaction support and the top plate. The constant temperature device includes a constant temperature chamber and a temperature control system, with the constant temperature chamber arranged on both sides of the fixed base; The pressurized bladder-type connector tube is installed in the casting cavity of the device and includes a bladder-type connector tube body, a pressurization component, and a detection component. The bladder-type connector tube body is an inflatable and deflated bladder-shaped structure. The pressurization component is connected to the inside of the bladder-type connector tube body and is used to control its internal air pressure. The detection component is located on the outer surface of the bladder-type connector tube body.

[0006] Preferably, the base further includes a transverse support and a crossbeam, both of which are mounted on the fixed base to limit lateral deformation of the fixed base; the side plate is detachably connected to the fixed base by octagonal bolts or hexagonal bolts; the device contains solidified mud and is also equipped with a mud pump, which is used to extract the solidified mud from the device.

[0007] Preferably, the fixing bolt is inserted through the top plate, and the fixing nut is threadedly engaged with the fixing bolt to lock the relative position of the top plate and the reaction support.

[0008] Preferably, the constant temperature chamber is symmetrically arranged on the left and right sides of the fixed base. The constant temperature chamber is equipped with a heating rod and an aqueous solution. The temperature control system is electrically connected to the heating rod inside the constant temperature chamber to adjust and maintain the temperature of the aqueous solution inside the constant temperature chamber.

[0009] Preferably, the pressurized bladder-type connector tube further includes a connector tube counterweight and a connecting screw, the connector tube counterweight being connected to the bottom of the bladder-type connector tube body via the connecting screw; the pressurization assembly includes a pressurization tube, a pressure gauge, and a pressure valve, all three being connected to the interior of the bladder-type connector tube body and positioned at the top of the bladder-type connector tube body; the detection assembly includes strain gauges and a pressure gauge, positioned at the interface between the bladder-type connector tube body and the concrete; connector tube lifting lugs are symmetrically arranged around the top of the bladder-type connector tube body; the bladder-type connector tube body is an inflatable rubber bag structure incorporating steel fibers.

[0010] A method for using a bag-type joint pipe simulated casting test device includes the following steps: Sl. Install the side plate to the fixed base and check the sealing of the device. Determine the test load, curing temperature and internal air pressure of the bladder-type connector tube. After filling the bladder-type connector tube body with the specified air pressure, close the air pressure valve. Fix the strain gauge and pressure gauge in the specified area on the surface of the bladder-type connector tube body. S2. After the pressurized bladder-type connector tube body is connected to the connector tube counterweight, it is placed inside the base. Release film is laid on the inner wall of the device, the top plate is installed and fixed, solid wall slurry is injected into the device, concrete is poured into the device through the pouring equipment, and the solid wall slurry in the device is extracted at the same time. S3. Remove the fixing structure of the top plate, install the horizontal support and beam to the fixed base, place the hydraulic jack between the reaction support and the top plate and adjust the support height; S4. Adjust the constant temperature chamber to the set curing temperature through the temperature control system, apply the load at the set rate through the hydraulic jack, and lock the reaction support to maintain the continuous load after the specified load is reached to carry out constant temperature curing. S5. During the test, monitor and record the values ​​of strain gauges, pressure gauges and barometers in real time, and check the load lock status regularly. S6. After the concrete curing is completed, unload the load of the reaction support, release the air pressure inside the bladder-type joint pipe body and take out the joint pipe, check the construction indicators of the concrete interface, dismantle the device and clean it.

[0011] Preferably, in step S4, the rate of increase of the load corresponds to the rate of concrete pouring; during the application of the load, the body of the bladder-type joint pipe is continuously pressurized to maintain stable internal air pressure; after the specified load is reached, the fixing nut is tightened to complete the load locking and the hydraulic jack is removed.

[0012] Preferably, in step S4, during the constant temperature curing process, the pressurization tube is closed and the pressure gauge value is monitored. When the pressure fluctuates significantly, the bladder-type connector tube body is pressurized to maintain stable internal pressure.

[0013] Preferably, in step S5, different monitoring and recording frequencies are used in the simulated pouring stage and the simulated curing stage to collect strain, pressure and air pressure data respectively, and the load lock status is checked regularly to avoid the load value from falling below the design value.

[0014] Preferably, in step S6, a force greater than the design load is first applied by a hydraulic jack, the fixing nut is removed, and the load is slowly unloaded; after the bag-type connector pipe body is removed, the verticality and integrity of the concrete interface are tested.

[0015] Therefore, this invention proposes a bladder-type joint pipe simulated casting test device and method, the beneficial effects of which are as follows: (l) By using a reaction device in conjunction with a loading component, the load on the concrete is precisely controlled, simulating the process of increasing load during the pouring of the anti-seepage wall. At the same time, the concrete solidification process under continuous load is simulated, restoring the actual stress state during construction.

[0016] (2) Equipped with a constant temperature device and temperature control system, it can accurately adjust the curing temperature and simulate curing conditions in different field environments, making the test conditions more in line with actual engineering scenarios.

[0017] (3) It can monitor the stress and deformation of the pressurized bladder joint pipe in real time during the pouring and curing stages, and combined with the concrete forming interface quality test results, it can provide a reliable test basis for the application of joint pipe engineering and optimization of construction scheme.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall invention; Figure 2 This is a schematic diagram of the device structure of the present invention; Figure 3 This is a schematic diagram of the concrete anti-seepage wall construction and pouring process of the present invention; Figure 4 This is a schematic diagram of the longitudinal cross-section of the device of the present invention; Figure 5 This is a schematic diagram illustrating the simulated concrete pouring process of the present invention; Figure 6 This is a schematic diagram of the transverse cross-section of the device of the present invention; Figure 7 This is a schematic diagram showing the details of the pressurized bladder-type connector tube of the present invention; Figure 8 This is a schematic diagram showing the details of the base portion of the present invention; Figure 9 This is a flowchart illustrating the operation of the present invention.

[0020] Figure Labels 1. Base; 2. Octagonal bolt; 3. Hexagonal bolt; 4. Horizontal support; 5. Crossbeam; 6. Reaction support; 601. Fixing bolt; 7. Fixing nut; 8. Hydraulic jack; 9. Temperature control system; 10. Constant temperature chamber; 11. Pressurized bladder-type connector pipe; 1101. Pressurization pipe; 1102. Pressure gauge; 1103. Pressure valve; 1104. Connecting pipe lifting lug; 1105. Connecting screw; 12. Connecting pipe counterweight; 13. Top plate; 14. Side plate; 15. Pouring equipment; 16. Strain gauge; 17. Pressure gauge; 18. Concrete; 19. Foundation; 20. Pumping machine; 21. Wall slurry; 22. Simulated test area. Detailed Implementation

[0021] To make the technical solutions, advantages, and objectives of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the protection scope of this application.

[0022] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0023] like Figures 1-9 As shown, the present invention provides a bladder-type joint pipe simulation casting test device and method.

[0024] like Figures 1-2 As shown, a bladder-type joint pipe simulated casting test device includes a base 1, a reaction device, a constant temperature device, and a pressurized bladder-type joint pipe 11.

[0025] The base 1 is the overall supporting body of the device, including a fixed base, a horizontal support 4, a crossbeam 5, a side plate 14, and a casting equipment 15.

[0026] Supports are provided on both sides of the fixed base to fix the crossbeam bracket; both the transverse bracket 4 and the crossbeam 5 are set on the fixed base to prevent the fixed base from undergoing transverse deformation.

[0027] like Figure 3 As shown, as the elevation of the concrete anti-seepage wall increases, the lateral pressure on the pressurized bladder joint pipe 11 in the simulated test area 22 gradually increases. After the specified elevation is reached, the pressurized bladder joint pipe 11 bears a continuous load until the joint pipe is pulled out after the concrete solidifies.

[0028] like Figures 4-5 As shown, the side plate 14 is detachably connected to the fixed base by octagonal bolts 2 and hexagonal bolts 3, and the two together form a casting cavity. The casting equipment 15 is used to inject concrete 18 with a specified ratio into the casting cavity.

[0029] The reaction device includes a reaction bracket 6, a fixing nut 7, a fixing bolt 601, a top plate 13, and a hydraulic jack 8.

[0030] The reaction support 6 is welded to the fixed base. A fixing bolt 601, threaded through the top plate 13, is connected to a fixing nut 7. The fixing bolt 601 is also welded to the top plate 13. A hydraulic jack 8 is positioned between the reaction support 6 and the top plate 13 to apply load. The hydraulic jack 8 is used to gradually apply load to the reaction support 6. Once the specified load is reached, the fixing nut 7 engages with the threaded connection of the fixing bolt 601 to continuously apply load to the concrete.

[0031] like Figure 6 As shown, the top plate 13 is temporarily fixed to the top of the device using the fixing nut 7, which is used to lock the relative position of the top plate 13 after the specified load is reached. Concrete 18 is poured using the pouring equipment 15 to maintain the continuous load on the concrete 18.

[0032] The device is equipped with a pumping machine 20. The casting cavity is filled with solidified mud 21. The pumping machine 20 is used to pump out the solidified mud 21 from inside the casting cavity.

[0033] The temperature control device includes a temperature control chamber 10 and a temperature control system 9. The temperature control chamber 10 contains heating rods and an aqueous solution, symmetrically arranged on both sides of a fixed base, used to maintain the curing temperature of the concrete 18. The temperature control system 9 is electrically connected to the heating rods inside the temperature control chamber 10 and is used to adjust the real-time operating temperature of the heating rods.

[0034] like Figures 7-8 As shown, the pressurized bladder-type connector pipe 11 is installed in the casting cavity and includes the bladder-type connector pipe body, connector pipe counterweight 12, pressurization pipe 1101, air pressure gauge 1102, air pressure valve 1103, connector pipe lifting lug 1104, connecting screw 1105, strain gauge 16 and pressure gauge 17.

[0035] The main body of the bladder-type connector pipe is made of steel fiber and an inflatable rubber bag; the counterweight 12 of the connector pipe is connected to the bottom of the bladder-type connector pipe body through the connecting screw 1105 to balance the buoyancy generated by the wall protection mud on the bladder-type connector pipe; the pressurization pipe 1101, the air pressure gauge 1102 and the air pressure valve 1103 are all connected to the inside of the bladder-type connector pipe body to jointly control the internal pressure of the connector pipe to stabilize within the set range.

[0036] The lifting lugs 1104 of the joint pipe are symmetrically distributed around the top of the joint pipe body for the transfer of the joint pipe; the strain gauges 16 and pressure gauges 17 are set in the interface area between the bladder-type joint pipe body and the concrete 18 for testing the stress distribution and deformation of the joint pipe under different conditions.

[0037] A method for using a bag-type joint pipe simulated casting test device, comprising the following steps: (1) Preparation stage: Install the side plate 14 onto the base 1, and after securing it with octagonal bolts 2 and hexagonal bolts 3, check the internal sealing to prevent leakage. Calculate the external conditions for the simulated test according to the test plan, determine the applied load and curing temperature, and further determine the internal air pressure value of the pressurized bladder-type connector tube 11. Connect the pressurization tube 1101 to an external pressurizer, pressurize to the specified air pressure value, and then close the air pressure valve 1103. Monitor the internal air pressure value of the connector tube using the air pressure gauge 1102 to ensure stability. Fix the strain gauge 16 and pressure gauge 17 to the designated area on the surface of the pressurized bladder-type connector tube 11.

[0038] (2) Installation and pouring stage: The treated pressurized bladder-type connector pipe 11 is connected to the connector pipe counterweight 12 via connecting screw 1105 and placed in the pouring cavity of the base 1. A PET high-temperature silicone oil release film is laid on the inner wall of the device to ensure normal demolding of the concrete after the test. The top plate 13 is connected to the reaction support 6 using fixing nuts 7. The prepared wall-stabilizing slurry 21 is injected into the device, and concrete 18 with the corresponding mix ratio is prepared at the same time. The concrete 18 is poured into the device using the pouring equipment 15, and the wall-stabilizing slurry 21 in the device is extracted simultaneously using the pump 20.

[0039] (3) Reinforcement process stage: After the pouring step is completed, loosen the fixing nut 7 so that the top plate 13 contacts the top surface of the concrete 18, and install the transverse support 4 and the crossbeam 5 to the corresponding positions of the base 1.

[0040] Place a hydraulic jack 8 between the reaction support 6 and the top plate 13, and adjust the support height of the hydraulic jack 8 to complete the alignment.

[0041] (4) Simulated pouring and curing stage: Based on the test plan, the pouring elevation and curing temperature of the upper part of the test area were determined, and the pressure value of the reaction support 6 on the concrete 18 was calculated. The internal temperature of the constant temperature chamber 10 was adjusted to the set simulated curing temperature through the temperature control system 9.

[0042] The load is gradually applied using hydraulic jack 8, with the rate of load increase matching the rate of concrete pouring. The continuous increase of the load is the simulated pouring process. During the application of the load, the pressurizing bag-type connector pipe 11 is pressurized throughout the process using a pressurizer to maintain stable internal air pressure.

[0043] Once the load reaches the specified value, tighten the fixing nut 7 to lock the load. After confirming that the load is stable, remove the hydraulic jack 8. The process of continuously applying the load under constant temperature conditions is the simulated curing process. During the simulated curing process, close the pressurization pipe 1101 and observe the value of the air pressure gauge 1102. If there is a significant fluctuation, use a pressurizer to supplement the pressurization.

[0044] (5) Experimental data monitoring stage: During the simulated pouring and curing process, the values ​​of strain gauges 16, pressure gauges 17, and air pressure gauges 1102 on the surface of the pressurized bladder joint pipe 11 are monitored and recorded in real time, and the position of the fixing nut 7 is calibrated at the same time.

[0045] During the simulated pouring stage, the recording frequency of strain gauge 16 and pressure gauge 17 was 20 times / min, and the recording frequency of barometer 1102 was 2 times / min; during the simulated curing stage, the recording frequency of strain gauge 16 and pressure gauge 17 was 3 times / min, and the recording frequency of barometer 1102 was 3 times / h. The position of the fixing nut 7 was checked periodically during the test to prevent loosening of the nut, which could lead to a sustained load lower than the design value.

[0046] (6) End of experiment: After the concrete 18 has been cured, confirm the position of the fixing nut 7 and place the hydraulic jack 8 back between the reaction support 6 and the top plate 13.

[0047] After applying a force greater than the design load, remove the fixing nut 7 and slowly release the load on the reaction support 6. After unloading, remove the hydraulic jack 8, top plate 13, and fixing nut 7 in sequence.

[0048] Open the air pressure valve 1103 to release the air pressure inside the pressurized bladder-type connector tube 11, and pull out the connector tube lifting lug 1104 to remove the connector tube. Take photos of the interface of the concrete 18 to check its verticality, integrity and other construction indicators.

[0049] Subsequently, the transverse support 4 and side plate 14 were removed, concrete sample 18 was taken out, and the test device was cleaned.

[0050] Therefore, this invention provides a simulated casting test device and method for pressurized bladder joint pipes, which solves the problems of unclear stress distribution and deformation law and lack of special simulation test verification means during concrete casting and curing of pressurized bladder joint pipes. It restores the load increase process and constant temperature and load curing conditions at different elevations during the construction of anti-seepage walls, and can accurately control the load level and curing temperature parameters, collect stress and deformation data of each area of ​​the joint pipe in real time, and simultaneously detect the forming quality of the concrete interface. It provides reliable test basis and technical support for the optimization of construction schemes and practical engineering applications of pressurized bladder joint pipes.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A bag-type joint pipe simulation casting test device, characterized in that, Includes a base, a reaction device, a temperature control device, and a pressurized bladder-type connector tube; The base includes a fixed base, side plates, and a pouring device. Supports are provided on both sides of the fixed base. The side plates are connected to the fixed base by bolts. The pouring device is used to inject concrete into the device. The reaction device includes a reaction support, a top plate, and a hydraulic jack. The reaction support is welded and fixed to the fixed base. The top plate is welded and fixed by fixing bolts. The fixing bolts pass through the top plate and are threaded with fixing nuts. The hydraulic jack is disposed between the reaction support and the top plate. The constant temperature device includes a constant temperature chamber and a temperature control system, with the constant temperature chamber arranged on both sides of the fixed base; The pressurized bladder-type connector tube is installed in the casting cavity of the device and includes a bladder-type connector tube body, a pressurization component, and a detection component. The bladder-type connector tube body is an inflatable and deflated bladder-shaped structure. The pressurization component is connected to the inside of the bladder-type connector tube body and is used to control its internal air pressure. The detection component is located on the outer surface of the bladder-type connector tube body.

2. The bladder-type joint pipe simulated casting test device according to claim 1, characterized in that, The base also includes a transverse support and a crossbeam, both of which are mounted on the fixed base to limit lateral deformation of the fixed base; the side plate is detachably connected to the fixed base by octagonal bolts or hexagonal bolts; the device contains solidified mud and is also equipped with a mud pump, which is used to extract the solidified mud from the device.

3. The bladder-type joint pipe simulated casting test device according to claim 1, characterized in that, The fixing bolts are inserted through the top plate, and the fixing nuts are threadedly engaged with the fixing bolts to lock the relative position of the top plate and the reaction support.

4. The bladder-type joint pipe simulated casting test device according to claim 3, characterized in that, The constant temperature chamber is symmetrically arranged on the left and right sides of the fixed base. The constant temperature chamber is equipped with a heating rod and an aqueous solution. The temperature control system is electrically connected to the heating rod inside the constant temperature chamber and is used to adjust and maintain the temperature of the aqueous solution inside the constant temperature chamber.

5. The bladder-type joint pipe simulated casting test device according to claim 4, characterized in that, The pressurized bladder-type connector tube also includes a connector tube counterweight and a connecting screw. The connector tube counterweight is connected to the bottom of the bladder-type connector tube body via the connecting screw. The pressurization assembly includes a pressurization tube, a pressure gauge, and a pressure valve, all of which are connected to the interior of the bladder-type connector tube body and are located on the top of the bladder-type connector tube body. The detection assembly includes strain gauges and a pressure gauge, located at the interface between the bladder-type connector tube body and the concrete. The top of the bladder-type connector tube body is symmetrically provided with connector tube lifting lugs. The bladder-type connector tube body is an inflatable rubber bag structure incorporating steel fibers.

6. A method of using a bag-type joint pipe simulated casting test device, comprising the bag-type joint pipe simulated casting test device according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Install the side plate to the fixed base and check the sealing of the device. Determine the test load, curing temperature and internal air pressure of the bladder-type connector tube. After filling the bladder-type connector tube body with the specified air pressure, close the air pressure valve. Fix the strain gauge and pressure gauge in the specified area on the surface of the bladder-type connector tube body. S2. After the pressurized bladder-type connector tube body is connected to the connector tube counterweight, it is placed inside the base. Release film is laid on the inner wall of the device, the top plate is installed and fixed, solid wall slurry is injected into the device, concrete is poured into the device through the pouring equipment, and the solid wall slurry in the device is extracted at the same time. S3. Remove the fixing structure of the top plate, install the horizontal support and beam to the fixed base, place the hydraulic jack between the reaction support and the top plate and adjust the support height; S4. Adjust the constant temperature chamber to the set curing temperature through the temperature control system, apply the load at the set rate through the hydraulic jack, and lock the reaction support to maintain the continuous load after the specified load is reached to carry out constant temperature curing. S5. During the test, monitor and record the values ​​of strain gauges, pressure gauges and barometers in real time, and check the load lock status regularly. S6. After the concrete curing is completed, unload the load of the reaction support, release the air pressure inside the bladder-type joint pipe body and take out the joint pipe, check the construction indicators of the concrete interface, dismantle the device and clean it.

7. The method of using the bag-type joint pipe simulated casting test device according to claim 6, characterized in that, In step S4, the rate of increase of the load corresponds to the rate of concrete pouring; during the application of the load, the body of the bladder-type joint pipe is continuously pressurized to maintain stable internal air pressure; after the specified load is reached, the fixing nut is tightened to complete the load locking and the hydraulic jack is removed.

8. The method of using the bag-type joint pipe simulated casting test device according to claim 6, characterized in that, In step S4, during the constant temperature curing process, the pressurization tube is closed and the pressure gauge value is monitored. When the pressure fluctuates significantly, the bladder-type connector tube body is pressurized to maintain the internal pressure stability.

9. The method of using the bag-type joint pipe simulated casting test device according to claim 6, characterized in that, In S5, different monitoring and recording frequencies are used in the simulated pouring stage and the simulated curing stage to collect strain, pressure and air pressure data respectively, and the load lock status is checked regularly to avoid the load value from falling below the design value.

10. The method of using the bag-type joint pipe simulated casting test device according to claim 6, characterized in that, In step S6, a force greater than the design load is first applied by a hydraulic jack, and the fixing nut is removed before slow unloading. After the bag-type connector pipe body is removed, the verticality and integrity of the concrete interface are tested.

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