An indoor test simulation device for construction of a concrete cutoff wall and a method of using the same

Abstract

The application belongs to the technical field of concrete cutoff wall construction test, and particularly relates to a kind of indoor test simulation device for concrete cutoff wall construction and its using method, the device includes concrete storage system and simulation construction system, concrete storage system and simulation construction system are communicated through concrete conveying pipe, and concrete storage system and simulation construction system are arranged at two ends of adjusting device.Adjusting device includes first lifting end and second lifting end, and concrete storage system is connected to movable end of first lifting end, and simulation construction system is connected to movable end of second lifting end.Constant pressure output assembly is arranged in concrete storage system, and constant pressure output assembly is used for output of concrete.Grating mechanism for inputting solid wall slurry is communicated at the top of simulation construction system, and discharging port is movably arranged in simulation construction system.During concrete injection process, the height difference between discharging port and bottom of concrete storage system is maintained constant.The device can directly observe the change of concrete and solid wall slurry interface area during concrete cutoff wall pouring process.

Description

Technical Field

[0001] This invention belongs to the field of concrete cut-off wall construction testing technology, and particularly relates to an indoor test simulation device for concrete cut-off wall construction and its usage method. Background Technology

[0002] As a common basic building structure, cutoff walls are widely used in municipal engineering, ports, and hydraulic engineering. With the continuous development of water conservancy and hydropower projects, the service environment of cutoff walls has gradually shifted to western mountainous areas and high-altitude regions, and the depth of cutoff walls has increased from tens of meters at the beginning to over 200 meters today.

[0003] For the construction of ultra-deep seepage barriers with complex geological conditions (over 100 meters), seepage barriers for reinforcement of reservoirs with complex geological and environmental conditions, and seepage barriers for large cofferdams, a number of construction technical challenges have emerged, such as borehole trenching construction technology, seepage barrier joint technology, and concrete pouring technology.

[0004] During the pouring of ultra-deep concrete cutoff walls, the interface between the slurry and the concrete is often a key focus of construction. Improper handling can lead to concrete mixing and mud inclusion at wall joints. However, because the cutoff wall construction is underground, it is impossible to directly monitor changes at the interface between the slurry and concrete, thus lacking the conditions for researching the formation mechanism of substances in this interface area and their impact on the quality of the concrete cutoff wall.

[0005] Based on the above problems, we urgently need an indoor test simulation device for the construction of concrete anti-seepage walls and its usage method to solve the problem that the interface area between the wall-stabilizing mud and concrete cannot be directly observed during actual construction. Summary of the Invention

[0006] The purpose of this invention is to provide an indoor test simulation device for the construction of concrete anti-seepage walls and its usage method to solve the above-mentioned problems.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] An indoor experimental simulation device for the construction of a concrete cutoff wall includes:

[0009] A concrete storage system and a simulated construction system are connected by a concrete conveying pipe, and the concrete storage system and the simulated construction system are located at opposite ends of the regulating device.

[0010] The adjusting device includes a first lifting end and a second lifting end. The concrete storage system is connected to the movable end of the first lifting end, and the simulated construction system is connected to the movable end of the second lifting end.

[0011] The concrete storage system is used for the storage and output of concrete.

[0012] The concrete storage system is equipped with a constant pressure output component, which is used for the output of the concrete.

[0013] The simulated construction system has a grouting mechanism connected to the top for inputting solidification slurry, and a movable discharge port is provided inside the simulated construction system, which is connected to the concrete conveying pipe.

[0014] During the concrete injection process, the height difference between the discharge port and the bottom of the concrete storage system remains constant.

[0015] Optionally, the concrete storage system includes:

[0016] A constant pressure box for storing concrete has a concrete inlet at the top, and a sealing cover is fitted over the inlet. One side of the sealing cover is connected to a pressurization hole and a pressure gauge, and the other side of the sealing cover is connected to an exhaust hole.

[0017] The exhaust port, the pressurization port, and the pressure gauge constitute the constant pressure output component.

[0018] The constant pressure tank for storing concrete is equipped with a mixing unit.

[0019] The bottom of the constant pressure concrete storage box is connected to one end of the concrete conveying pipe.

[0020] Optionally, the mixing unit includes a mixing fan, which is rotatably disposed within the concrete storage constant pressure tank.

[0021] Optionally, the adjusting device includes:

[0022] The base has the fixed ends of the first and second lifting ends fixedly connected to its two sides respectively.

[0023] The base is embedded with a control device for controlling the first lifting end and the second lifting end.

[0024] Optionally, the first lifting end includes:

[0025] The fixed groove is fixed to the bottom of the concrete storage constant pressure box. The movable ends of the first telescopic rod are fixed to the four corners of the bottom of the fixed groove. The fixed end of the first telescopic rod is fixed to the base. The first telescopic rod is electrically connected to the control device.

[0026] The concrete conveying pipe passes through the fixed groove and is connected to the bottom of the concrete storage constant pressure box.

[0027] Optionally, the first telescopic rod is connected to a hydraulic pump, which is electrically connected to the control device.

[0028] Optionally, the simulated construction system includes:

[0029] A simulated casting box has an inlet and an outlet connected to its top sides, respectively. The inlet and outlet are used to inject the solidification slurry into the top of the simulated casting box. The inlet is connected to the outlet of the grouting mechanism.

[0030] The bottom of the simulated pouring box is provided with a connection port for communicating with the concrete conveying pipe.

[0031] The connection port is connected to one end of the telescopic tube, the other end of the telescopic tube is raised and lowered, the telescopic tube is hollow, and the telescopic tube is located inside the simulated casting box.

[0032] The top of the telescopic pipe serves as the outlet for the concrete.

[0033] One end of a steel strand is fixed to the top of the telescopic tube, and the other end of the steel strand is fixed to the bottom of the top plate. The four corners of the bottom of the top plate are respectively fixed to the base by support rods.

[0034] The telescopic tube includes several sleeves coaxially sleeved from the inside to the outside. Adjacent sleeves are slidably limited by a limiting block and a limiting groove. The top of the top sleeve is provided with a tension hole for connection with the steel strand.

[0035] The bottom of the simulated pouring box is connected to the movable end of the second lifting end.

[0036] A protective bracket is installed below the simulated pouring box, and the protective bracket is fixed to the base.

[0037] Optionally, the second lifting end includes:

[0038] A fixed support is fixedly connected to the bottom of the simulated casting box. The movable ends of the second telescopic rod are fixedly connected to the four corners of the bottom of the fixed support. The fixed end of the second telescopic rod is fixed to the base. The second telescopic rod is electrically connected to the control device.

[0039] Optionally, one end of the concrete conveying pipe is threaded, and a control valve is connected to the middle of the concrete conveying pipe. A flange is threadedly connected to the conduit, and the flange is fixed to the bottom of the simulated pouring box. The concrete conveying pipe is connected to the telescopic pipe inside the simulated pouring box through the flange.

[0040] The flange is fixed to the bottom of the simulated casting box by fixing bolts.

[0041] A method for using an indoor test simulation device for the construction of a concrete cutoff wall, comprising the following steps:

[0042] Adjust the height of the simulated construction system.

[0043] Adjust the height of the concrete storage system. By adjusting the height difference between the discharge end and the discharge port of the concrete storage system, and in conjunction with the constant pressure output component, the speed at which the concrete flows into the simulated construction system from the concrete storage system is made zero.

[0044] The height of the concrete storage system is fixed.

[0045] The speed at which concrete flows into the simulated construction system is adjusted by regulating the constant pressure output component.

[0046] Simultaneously, the wall-stabilizing slurry is injected from the top of the simulated construction system while the concrete is being injected, and the simulated construction system descends during the concrete injection process.

[0047] The flow rate of the concrete into the simulated construction system was varied to investigate the effect of different concrete outflow velocities on the interface region.

[0048] Compared with the prior art, the present invention has the following advantages and technical effects:

[0049] In operation, first adjust the height of the simulated construction system, then adjust the height of the concrete storage system. By adjusting the height difference between the discharge end and the outlet of the concrete storage system, and in conjunction with the constant pressure output component, the velocity of concrete flowing into the simulated construction system from the storage system is made zero. After determining the height of the concrete storage system, the velocity of concrete flowing into the simulated construction system is adjusted by adjusting the constant pressure output component. Simultaneously, solidification slurry is injected from the top of the simulated construction system while the concrete is being injected. During the concrete injection process, the simulated construction system descends. The velocity of concrete flowing into the simulated construction system is varied to investigate the impact of different concrete outflow velocities on the interface area.

[0050] Compared to traditional methods, this device can be used repeatedly and effectively simulates the construction process of concrete cut-off walls. It can directly observe the changes in the interface area between concrete and solidification slurry during the pouring of concrete cut-off walls. The measured and recorded experimental phenomena and data reflect the actual process of concrete cut-off wall pouring to a certain extent, providing useful reference and guidance for on-site construction. It has strong practicality and good promotion value. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of the indoor test simulation system of the present invention.

[0053] Figure 2 This is a schematic diagram of the concrete storage system of the present invention.

[0054] Figure 3 This is a schematic diagram of the construction simulation system of the present invention.

[0055] Figure 4 This is a front view of the indoor test simulation system of the present invention.

[0056] Figure 5 This is a partially enlarged schematic diagram of the connection point of the concrete conveying pipe in this invention.

[0057] Figure 6 This is an enlarged schematic diagram of the interior of the simulated casting box of the present invention.

[0058] Figure 7 This is a schematic diagram illustrating the simulated pouring process of the present invention.

[0059] The components include: 1. Concrete storage constant pressure box; 2. Fixing groove; 3. Concrete conveying pipe; 4. First telescopic rod; 5. Control device; 6. Base; 7. Top plate; 8. Support rod; 9. Simulated pouring box; 10. Fixed support; 11. Second telescopic rod; 12. Protective bracket; 13. Flange; 14. Steel strand; 15. Telescopic pipe; 16. Fixing bolt; 17. Concrete; 18. Wall-stabilizing slurry; 19. Hydraulic pump; 101. Concrete inlet; 102. Sealing cover; 103. Mixing fan; 104. Vent; 105. Pressurization hole; 106. Pressure gauge; 301. Control valve; 302. Thread; 901. Grout inlet; 902. Grout outlet; 903. Connection port; 1501. Limiting block; 1502. Limiting groove; 1503. Tension hole. Detailed Implementation

[0060] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0062] Reference Figures 1 to 7 This invention discloses an indoor test simulation device for the construction of concrete anti-seepage walls, comprising:

[0063] The concrete storage system and the simulated construction system are connected by a concrete conveying pipe 3, and the concrete storage system and the simulated construction system are located at both ends of the regulating device.

[0064] The adjustment device includes a first lifting end and a second lifting end. The concrete storage system is connected to the movable end of the first lifting end, and the simulated construction system is connected to the movable end of the second lifting end.

[0065] The concrete storage system is used for the storage and output of concrete 17.

[0066] A constant pressure output component is installed in the concrete storage system, which is used for the output of concrete 17.

[0067] The top of the simulated construction system is connected to a grouting mechanism for inputting solidified mud 18. The simulated construction system is equipped with a movable discharge port, which is connected to the concrete conveying pipe 3.

[0068] During the concrete injection process, the height difference between the discharge port and the bottom of the concrete storage system remains constant.

[0069] The present invention includes a concrete storage system, a simulated construction system, an adjustment device, and a concrete conveying pipe 3.

[0070] In operation, first adjust the height of the simulated construction system, then adjust the height of the concrete storage system. By adjusting the height difference between the discharge end and the discharge port of the concrete storage system, and in conjunction with the constant pressure output component, the velocity of concrete 17 flowing into the simulated construction system from the storage system is made zero. After the height of the concrete storage system is determined, the velocity of concrete 17 flowing into the simulated construction system is adjusted by adjusting the constant pressure output component. Simultaneously with the injection of concrete 17, wall-stabilizing slurry 18 is injected from the top of the simulated construction system. During the injection of concrete 17, the simulated construction system descends. The velocity of concrete 17 flowing into the simulated construction system is varied to investigate the effect of different concrete outflow velocities on the interface area.

[0071] As an optional implementation, the concrete storage system includes:

[0072] The concrete storage constant pressure box 1 has a concrete inlet 101 on the top and a sealing cover 102 on the concrete inlet 101. One side of the sealing cover 102 is connected to the pressure hole 105 and the pressure gauge 106, and the other side of the sealing cover 102 is connected to the exhaust hole 104.

[0073] The exhaust port 104, the pressurization port 105, and the pressure gauge 106 constitute a constant pressure output component.

[0074] The constant pressure box for storing concrete is equipped with a mixing unit.

[0075] The bottom of the concrete storage constant pressure box 1 is connected to one end of the concrete conveying pipe 3.

[0076] As an optional implementation, the mixing unit includes a mixing fan 103, which is rotatably disposed inside the concrete storage constant pressure box 1.

[0077] The concrete storage system includes a constant pressure tank 1 for storing concrete.

[0078] Among them, the concrete constant pressure box 1 is a cylindrical structure, and its specific dimensions can be adjusted according to the test plan.

[0079] Furthermore, the concrete storage pressure chamber 1 has a concrete inlet 101 on its side wall, which is covered by a matching sealing cover 102. The top two sides of the concrete storage pressure chamber 1 are respectively equipped with an exhaust port 104, a pressurization port 105, and a pressure gauge 106, which can effectively regulate the internal pressure of the concrete storage pressure chamber 1. The concrete storage pressure chamber 1 is equipped with a stirring fan 103 to reduce the rate at which the concrete 17 inside the concrete storage pressure chamber 1 solidifies.

[0080] As an optional implementation, the adjustment device includes:

[0081] The base 6 has its first lifting end fixed end and the second lifting end fixed end fixedly connected to both sides of the base 6.

[0082] The base 6 is embedded with a control device 5 for controlling the first and second lifting ends.

[0083] As an optional implementation, the first lifting end includes:

[0084] The fixed groove 2 is fixed to the bottom of the concrete storage constant pressure box 1. The movable ends of the first telescopic rod 4 are fixed to the four corners of the bottom of the fixed groove 2 respectively. The fixed end of the first telescopic rod 4 is fixed to the base 6. The first telescopic rod 4 is electrically connected to the control device 5.

[0085] The concrete conveying pipe 3 passes through the fixed groove 2 and is connected to the bottom of the concrete storage constant pressure box 1.

[0086] As an optional implementation, the first telescopic rod 4 is connected to a hydraulic pump 19, which is electrically connected to the control device 5.

[0087] The concrete storage constant pressure box 1 is placed above the fixed groove 2. The fixed groove 2 is connected to the first telescopic rod 4. A hydraulic pump 19 is provided below the first telescopic rod 4. The spacing of the fixed groove 2 is determined by the size of the concrete storage constant pressure box 1.

[0088] As an optional implementation method, the construction simulation system includes:

[0089] The simulated casting box 9 has an inlet 901 and a outlet 902 connected to the top two sides respectively. The inlet 901 and outlet 902 are used to inject solidified mud 18 into the top of the simulated casting box 9.

[0090] The grout inlet 901 is connected to the grout outlet of the grouting mechanism.

[0091] The bottom of the simulated pouring box 9 is provided with a connection port 903 for connecting with the concrete conveying pipe 3.

[0092] The connector 903 is connected to one end of the telescopic tube 15, the other end of the telescopic tube 15 is raised and lowered, the telescopic tube 15 is hollow, and the telescopic tube 15 is located inside the simulated pouring box 9.

[0093] The top of the telescopic pipe 15 is used as the outlet for concrete 17.

[0094] One end of the steel strand 14 is fixed to the top of the telescopic pipe 15, and the other end of the steel strand 14 is fixed to the bottom of the top plate 7. The four corners of the bottom of the top plate 7 are fixed to the base 6 by support rods 8 respectively.

[0095] The telescopic tube 15 includes several sleeves coaxially sleeved from the inside to the outside. Adjacent sleeves are slidably limited by a limiting block 1501 and a limiting groove 1502. The top of the top sleeve is provided with a tension hole 1503 for connection with the steel strand 14.

[0096] The bottom of the simulated pouring box 9 is connected to the movable end of the second lifting end.

[0097] A protective bracket 12 is installed below the simulated pouring box 9, and the protective bracket 12 is fixed on the base 6.

[0098] Among them, the simulated pouring box 9 is a cylindrical structure made of transparent plastic material. Its specific size can be adjusted according to the test plan. The test personnel can clearly see the inside of the simulated pouring box 9 from the outside and can observe and record the specific situation of the interface area between the concrete 17 and the solidified mud 18 during the simulated pouring process.

[0099] The simulated casting box 9 contains a telescopic tube 15, which is a hollow cylindrical structure. The specific dimensions of the telescopic tube 15 are determined by the test plan. Each section of the telescopic tube 15 has a limiting block 1501 at the top and a limiting groove 1502 at the bottom to prevent tensile deformation during the test. The bottom of the telescopic tube 15 is welded to the flange 13, which is then secured to the bottom of the simulated casting box 9 using fixing bolts 16. After connection, the overall airtightness of the simulated casting box 9 must be checked.

[0100] The bottom of the simulated pouring box 9 is provided with a connection port 903, and a flange 13 is provided at the connection port 903. One end of the concrete conveying pipe 3 is connected to the flange 13 through a thread 302.

[0101] As an optional implementation, the second lifting end includes:

[0102] The fixed support 10 is fixedly connected to the bottom of the simulated pouring box 9. The movable ends of the second telescopic rod 11 are fixedly connected to the four corners of the bottom of the fixed support 10. The fixed end of the second telescopic rod 11 is fixed to the base 6. The second telescopic rod 11 is electrically connected to the control device 5.

[0103] As an optional implementation, one end of the concrete conveying pipe 3 is provided with a thread 302, and a control valve 301 is connected to the middle of the concrete conveying pipe 3. A flange 13 is threadedly connected to the thread 302, and the flange 13 is fixed to the bottom of the simulated pouring box 9. The concrete conveying pipe 3 is connected to the telescopic pipe 15 inside the simulated pouring box 9 through the flange 13.

[0104] Flange 13 is fixed to the bottom of the simulated casting box 9 by fixing bolts 16.

[0105] The simulated pouring box 9 is placed above the fixed support 10, which is connected to the second telescopic rod 11. The cross-sectional dimensions of the fixed support 10 should be larger than the bottom surface of the simulated pouring box 9. A hole is provided in the middle of the fixed support 10, with a diameter slightly larger than the connection port at the bottom of the simulated pouring box 9, to facilitate the connection between the concrete conveying pipe 3 and the simulated pouring box 9. The top plate 7, support rods 8, and base 6 are connected by welding. The interval between the top plate 7 and the base 6 is determined by the dimensions of the simulated pouring box 9. If the interval is too high, the number or cross-sectional dimensions of the support rods 8 can be appropriately increased.

[0106] After the telescopic pipe 15 is connected to the simulated pouring box 9, the simulated pouring box 9 is placed above the fixed support 10. According to the test plan, the second telescopic rod 11 is controlled by the control device 5. After the simulated pouring box 9 is adjusted to a suitable height, the internal telescopic pipe 15 is connected to the top plate 7.

[0107] The top of the telescopic tube 15 is provided with a tension hole 1503, and the steel strand 14 passes through the tension hole 1503 and is connected to the top plate 7.

[0108] A method for using an indoor test simulation device for the construction of a concrete cutoff wall, comprising the following steps:

[0109] Adjust the height of the simulated construction system.

[0110] Adjust the height of the concrete storage system. By adjusting the height difference between the discharge end and the discharge port of the concrete storage system, and in conjunction with the constant pressure output component, make the flow rate of concrete 17 from the concrete storage system into the simulated construction system zero.

[0111] Fixed concrete storage system height.

[0112] The speed at which concrete 17 flows into the simulated construction system is adjusted by regulating the constant pressure output component.

[0113] While concrete 17 is being injected, wall-stabilizing slurry 18 is being injected from the top of the simulated construction system. During the injection of concrete 17, the simulated construction system descends.

[0114] The flow rate of concrete 17 into the simulated construction system was varied to investigate the effect of different concrete outflow velocities on the interface region.

[0115] The specific steps for using this device are as follows:

[0116] S1. Design the test plan and determine the concrete mix ratio, the type of wall-stabilizing slurry, the concrete flow rate, the size of the simulated pouring box, and the corresponding dimensions of the concrete conveying pipe and the expansion joint, etc.

[0117] S2. Assemble the equipment. According to the size of the simulated pouring box 9, adjust the second telescopic rod 11 to a suitable position, install the telescopic pipe 15 into the simulated pouring box 9, place the simulated pouring box 9 on the fixed support 10, and use the concrete conveying pipe 3 to connect the concrete storage constant pressure box 1 and the simulated pouring box 9.

[0118] S3. Adjust the equipment, test the performance of the first telescopic rod 4 and the second telescopic rod 11, conduct multiple waterproof tests on the assembled equipment, and drain all the solution inside the equipment.

[0119] S4. Prepare concrete 17 and wall-stabilizing slurry 18, close control valve 301, pour concrete 17 into concrete storage constant pressure tank 1, close concrete inlet 101, and turn on mixing fan 103. At the same time, inject wall-stabilizing slurry 18 into simulated casting box 9.

[0120] S5. Open control valve 301, adjust the height of concrete storage constant pressure box 1 to ensure that concrete 17 flows into simulated pouring box 9 and the outflow speed is close to zero, fix the height of concrete storage constant pressure box 1, and close control valve 301.

[0121] S6. According to the test plan, determine the concrete outflow rate and set the specified pressure in the constant pressure box 1. Calculate the descent speed of the simulated pouring box according to formula (1) and set the corresponding speed in the control device 5.

[0122] S7. Turn on the high-frequency camera and open the control valve 301 to control the simulated pouring box 9 to descend slowly and uniformly. During the simulated construction process test, measure and record the flow rate changes of the solidified mud 18 at the corresponding location, and sample and preserve the material at the interface between the concrete 17 and the solidified mud 18 at different times.

[0123] S8. After pouring, clean the simulated pouring box 9, the constant pressure box 1 for storing concrete, and the concrete conveying pipe 3 before the concrete 17 initially sets. Repeat steps S2 to S7, adjust the internal pressure of the constant pressure box 1 for storing concrete, and explore the effect of different concrete outflow velocities on the interface area.

[0124] According to the experimental design, prepare the corresponding concrete 17 and wall-stabilizing slurry 18. Pour the concrete 17 into the constant pressure storage tank 1, close the concrete inlet 101, and turn on the mixing fan 103. Pour some of the concrete 17 into the bottom of the simulated casting tank 9. The initial height of the concrete 17 should exceed the top of the expansion tube 15 (in a fully contracted state). Inject the prepared wall-stabilizing slurry 18 into the simulated casting tank 9 through the slurry inlet 901.

[0125] Open the control valve 301 and adjust the relative height (h) between the bottom of the concrete storage constant pressure box 1 and the top of the telescopic pipe 15 through the regulating device 5. This can effectively solve the problem of slow flow or blockage of concrete 17 in the concrete conveying pipe 3 due to friction, and ensure that concrete 17 can flow smoothly into the simulated pouring box 9 with a flow rate close to zero. Fix the height of the first telescopic rod 4 and close the control valve 301.

[0126] Specifically, according to the experimental design, the flow rate of concrete 17 to be simulated was selected. The relationship between the flow rate of concrete 17 and the internal pressure of the constant pressure box 1 was calculated through pre-experiment. The pressurization hole 105 and the vent hole 104 were adjusted to ensure that the internal pressure of the constant pressure box 1 met the requirements of the experimental design. According to formula (1), the descent speed of the simulated pouring box 9 was calculated to ensure the continuity of concrete 17 pouring.

[0127] (1)

[0128] In the formula: v0 represents the moving speed (m / s) of the second telescopic rod 11. v represents the velocity of concrete flow (m / s). A0 represents the bottom area of ​​the simulated pouring box (m²). 2 A represents the cross-sectional area (m²) of the concrete conveying pipe. 2 ).

[0129] The speed of the second telescopic rod 11 is adjusted by the control device 5. At the same time, the control valve 301 is opened. The fixed support 10 descends at a constant speed with the second telescopic rod 11. The simulated pouring box 9 also descends slowly under its own weight. Due to the tension of the steel strand 14, the telescopic tube 15 slowly extends, thus achieving the purpose of simulating the pouring of concrete anti-seepage wall.

[0130] It is worth noting that during the extension of the telescopic pipe 15, the relative height (h) between the top of the telescopic pipe 15 and the bottom of the concrete storage constant pressure box 1 did not change. Simultaneously, the internal pressure of the concrete storage constant pressure box 1 remained almost unchanged during the pouring process. Therefore, the outflow velocity of the concrete 17 remained consistent throughout the pouring process. In the simulated pouring process, the extension of the telescopic pipe 15 had minimal impact on the interface between the solidified mud 18 and the concrete 17, allowing for effective observation of the specific reaction in this area during the pouring of the concrete 17.

[0131] The indoor test simulation device also includes a high-frequency camera, a flow rate meter, and a sampling device.

[0132] Among them, a high-frequency camera is used to record the changes in the interface area between concrete 17 and solid wall slurry 18 during the pouring process, a flow velocity meter is used to measure the flow velocity changes of solid wall slurry 18 at different locations during the pouring process, and samples from the interface area at different times are extracted for component analysis during the pouring process.

[0133] Furthermore, after all components are connected, an overall waterproof test must be conducted on the device before any actual testing is carried out. The specific steps for the test are as follows:

[0134] S1. Inject tap water into the constant pressure concrete storage box 1 and the simulated pouring box 9, and seal the concrete inlet 101 with the sealing cap 102.

[0135] S2. Open the control valve 301 of the concrete conveying pipe 3.

[0136] S3. Check whether there is solution seepage at the bottom of the simulated pouring box 9 and the constant pressure box for concrete storage 1.

[0137] S4. If no solution seeps out, close control valve 301.

[0138] S5. Inject air into the constant pressure box 1 for concrete storage through the pressure hole 105 to adjust the internal pressure of the constant pressure box 1 for concrete storage.

[0139] S6. Use a flow velocity meter to test and record the flow velocity in the end region of the telescopic pipe 15.

[0140] S7. Repeat steps S2 to S6 to ensure that no solution seeps out from the bottom under different air pressure conditions.

[0141] After the waterproof test of the entire device is completed, close the control valve 301 and use a pumping device to drain all the solution inside the device.

[0142] This invention provides an indoor experimental simulation device for the construction of concrete cut-off walls and its usage method. The equipment is reusable and effectively simulates the construction process of concrete cut-off walls. It allows direct observation of the changes in the interface area between concrete 17 and solidification slurry 18 during the pouring of the concrete cut-off wall. It also provides a method for achieving uniform concrete pouring. By using a high-frequency camera and flow velocity measurement equipment, the influence of different concrete outflow velocities on the disturbance of the interface area between concrete 17 and solidification slurry 18 during the pouring process can be effectively recorded. Furthermore, the dimensions of the simulation pouring box 9, the dimensions of the telescopic pipe 15, and the types of concrete 17 and solidification slurry 18 involved in this invention can all be adjusted according to actual needs, making it highly versatile. The measured and recorded experimental phenomena and data reflect the actual process of concrete cut-off wall pouring to a certain extent, providing useful reference and guidance for on-site construction, and possessing strong practicality and good promotional value.

[0143] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0144] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An indoor test simulation device for construction of a concrete diaphragm wall, characterized by, The application relates to a concrete storage system and a simulation construction system, which are communicated through a concrete conveying pipe (3), and are arranged at two ends of an adjusting device. The adjusting device comprises a first lifting end and a second lifting end, the concrete storage system is connected to a movable end of the first lifting end, and the simulation construction system is connected to a movable end of the second lifting end. The concrete storage system is used for storing and outputting concrete (17). A constant-pressure output assembly is arranged in the concrete storage system and is used for outputting the concrete (17). A grouting mechanism for inputting solid wall mud (18) is communicated with the top of the simulation construction system, and a movable discharge port is arranged in the simulation construction system and is communicated with the concrete conveying pipe (3). During the injection of the concrete (17), the height difference between the discharge port and the bottom of the concrete storage system is kept constant. The adjusting device comprises a base (6). The simulation construction system comprises a simulation pouring box (9), the bottom of the simulation pouring box (9) is provided with a connecting port (903) for being communicated with the concrete conveying pipe (3), one end of an extension pipe (15) is communicated with the connecting port (903), the other end of the extension pipe (15) is arranged in a lifting mode, the extension pipe (15) is hollow, the extension pipe (15) is arranged in the simulation pouring box (9), the top of the extension pipe (15) is used as the discharge port of the concrete (17), one end of a steel strand (14) is fixedly connected to the top of the extension pipe (15), the other end of the steel strand (14) is fixedly connected to the bottom of a top plate (7), and the bottom of the top plate (7) is fixed to the base (6) through four supporting rods (8) respectively. The concrete storage system comprises:

2. The indoor test simulation device for construction of a concrete diaphragm wall according to claim 1, characterized in that, A concrete storage constant-pressure box (1), an inlet port (101) is formed in the top of the concrete storage constant-pressure box (1), a sealing cover (102) is sealingly matched with the inlet port (101), a pressurizing hole (105) and a pressure gauge (106) are communicated with one side of the sealing cover (102), and an exhaust hole (104) is communicated with the other side of the sealing cover (102). The exhaust hole (104), the pressurizing hole (105) and the pressure gauge (106) constitute the constant-pressure output assembly. An agitating part is arranged in the concrete storage constant-pressure box (1). The bottom of the concrete storage constant-pressure box (1) is communicated with one end of the concrete conveying pipe (3). The agitating part comprises an agitating fan (103), and the agitating fan (103) is arranged in a rotating mode in the concrete storage constant-pressure box (1).

3. The indoor test simulation device for construction of a concrete diaphragm wall according to claim 2, characterized in that, The fixed ends of the first lifting end and the second lifting end are fixedly connected to the two sides of the base (6).

4. The indoor test simulation device for construction of a concrete diaphragm wall according to claim 2, characterized in that, A control device (5) for controlling the first lifting end and the second lifting end is embedded in the base (6). The first lifting end comprises:

5. The indoor test simulation device for construction of a concrete diaphragm wall according to claim 4, wherein A fixed groove (2) is fixed to the bottom of the concrete storage constant-pressure box (1), the bottom of the fixed groove (2) is fixedly connected to the movable ends of four first extension rods (4) respectively, the fixed ends of the first extension rods (4) are fixedly connected to the base (6), and the first extension rods (4) are electrically connected to the control device (5). ​ The concrete conveying pipe (3) is communicated with the bottom of the concrete storage constant pressure box (1) through the fixed groove (2).

6. The indoor test simulation device for construction of a concrete diaphragm wall according to claim 5, wherein The first telescopic rod (4) is communicated with a hydraulic pump (19), and the hydraulic pump (19) is electrically connected with the control device (5).

7. The indoor test simulation device for construction of a concrete diaphragm wall according to claim 4, wherein Two sides of the top of the simulation pouring box (9) are respectively communicated with a grout inlet (901) and a grout outlet (902), the grout inlet (901) and the grout outlet (902) are used for injecting the solid wall mud (18) into the top of the simulation pouring box (9), and the grout inlet (901) is communicated with a grout outlet end of the grouting mechanism. The telescopic pipe (15) comprises a plurality of sleeve pipes coaxially sleeved from inside to outside, adjacent two sleeve pipes are slidingly limited and matched through a limiting block (1501) and a limiting groove (1502), and a tension hole (1503) connected with the steel strand (14) is arranged at the top of the sleeve pipe at the top. The bottom of the simulation pouring box (9) is connected with the movable end of the second lifting end. A protection support (12) is arranged below the simulation pouring box (9), and the protection support (12) is fixed on the base (6).

8. The indoor test simulation device for construction of a concrete diaphragm wall according to claim 7, characterized in that, The second lifting end comprises: A fixed support (10) is fixedly connected with the bottom of the simulation pouring box (9), the movable end of the second telescopic rod (11) is fixedly connected with the bottom of the fixed support (10) at four corners, the fixed end of the second telescopic rod (11) is fixed with the base (6), and the second telescopic rod (11) is electrically connected with the control device (5).

9. The indoor test simulation device for construction of a concrete diaphragm wall according to claim 7, characterized in that, One end of the concrete conveying pipe (3) is provided with a thread (302), and the middle part of the concrete conveying pipe (3) is communicated with a control valve (301); the thread (302) is threadedly and matchingly connected with a flange (13), the flange (13) is fixed on the bottom of the simulation pouring box (9), and the concrete conveying pipe (3) is communicated with the telescopic pipe (15) in the simulation pouring box (9) through the flange (13). The flange (13) is fixedly connected with the bottom of the simulation pouring box (9) through a fixing bolt (16).

10. A method for using a simulation device for indoor test of construction of concrete diaphragm wall according to any one of claims 1 to 9, wherein the simulation device is used. The method comprises the following steps: ​ Adjusting the height of the simulation construction system; Adjusting the height of the concrete storage system, adjusting the height difference between the discharging end of the concrete storage system and the discharging port, and cooperating with the constant pressure output assembly to make the flow rate of the concrete (17) in the concrete storage system into the simulation construction system be zero; Fixing the height of the concrete storage system; Adjusting the flow rate of the concrete (17) into the simulation construction system through the constant pressure output assembly; Injecting the concrete (17) and injecting the solid wall mud (18) from the top of the simulation construction system, lowering the simulation construction system during the injection of the concrete (17); Changing the flow rate of the concrete (17) into the simulation construction system to explore the influence of different concrete flow rates on the interface region.

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