Indoor test simulation device for concrete diaphragm wall construction and use method of indoor test simulation device

Abstract

The invention belongs to the technical field of concrete diaphragm wall construction tests, and particularly relates to an indoor test simulation device for concrete diaphragm wall construction and a using method thereof.The device comprises a concrete storage system and a simulation construction system, and the concrete storage system and the simulation construction system are communicated through a concrete conveying pipe; the concrete storage system and the simulation construction system are arranged at the two ends of the adjusting device. The adjusting device comprises 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 simulation construction system is connected to the movable end of the second lifting end. A constant-pressure output assembly is arranged in the concrete storage system and used for outputting concrete. The top of the simulation construction system communicates with a grouting mechanism used for inputting wall fixing slurry, and a movably-arranged discharging port is formed in the simulation construction system. In the concrete injection process, the height difference between the discharging port and the bottom of the concrete storage system is kept constant. The device can be used for directly observing the change condition of the junction area of the concrete and the wall-fixing slurry in the pouring process of the concrete diaphragm wall.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of concrete cutoff wall construction test, and particularly relates to a concrete cutoff wall construction indoor test simulation device and a use method thereof. BACKGROUND

[0002] As a common foundation building structure, cutoff walls are widely used in municipal, port and hydraulic fields. With the continuous development of water conservancy and hydropower engineering construction, the service environment of cutoff walls has gradually changed to western mountainous areas and high-altitude areas, and the depth of cutoff walls has changed from dozens of meters at the beginning to more than 200m at present.

[0003] For the construction of super-deep and complex geological condition cutoff walls, complex geological and environmental condition dangerous reservoir reinforcement cutoff walls and large cofferdam cutoff walls, there are many construction technical problems, such as hole forming and slotting construction technology, cutoff wall joint technology and concrete pouring technology.

[0004] In the pouring process of super-deep concrete cutoff walls, the interface area between the wall stabilizing mud and the concrete is often one of the focuses of construction. If not handled properly, it will cause adverse consequences such as concrete mixing with mud, wall segment joint mud and the like. However, since the cutoff wall construction is located underground, the changes in the interface area between the wall stabilizing mud and the concrete cannot be directly monitored, and thus the research conditions for the generation mechanism of the substances in the interface area and the influence on the quality of the concrete cutoff wall are lacking.

[0005] Based on the above problems, we urgently need a concrete cutoff wall construction indoor test simulation device and a use method thereof to solve the problem that the interface area between the wall stabilizing mud and the concrete cannot be directly observed in the actual construction process. SUMMARY

[0006] The purpose of the present application is to provide a concrete cutoff wall construction indoor test simulation device and a use method thereof to solve the above problems.

[0007] To achieve the above purpose, the present application provides the following solutions:

[0008] A concrete cutoff wall construction indoor test simulation device, comprising:

[0009] A concrete cutoff wall construction indoor test simulation device, comprising:

[0010] The adjusting device comprises 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 simulation construction system is connected to the movable end of the second lifting end.

[0011] The concrete storage system is used for storing and outputting concrete.

[0012] The constant pressure output assembly is arranged in the concrete storage system and used for outputting the concrete.

[0013] The grouting mechanism for inputting solid wall mud is communicated with the top of the simulated construction system, and the movable discharge port is arranged in the simulated construction system and communicated with 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 is maintained constant.

[0015] Optionally, the concrete storage system comprises:

[0016] The concrete storage constant pressure box is provided with the concrete inlet on the top, the sealing cover is sealingly matched with the concrete inlet, the pressurizing hole and the air pressure gauge are communicated with one side of the sealing cover, and the exhaust hole is communicated with the other side of the sealing cover.

[0017] The exhaust hole, the pressurizing hole and the air pressure gauge constitute the constant pressure output assembly.

[0018] The stirring part is arranged in the concrete storage constant pressure box.

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

[0020] Optionally, the stirring part comprises a stirring fan, and the stirring fan is rotatably arranged in the concrete storage constant pressure box.

[0021] Optionally, the adjusting device comprises:

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

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

[0024] Optionally, the first lifting end comprises:

[0025] The fixed groove is fixed with the bottom of the concrete storage constant pressure box, the movable ends of the first telescopic rods are respectively fixedly connected to the bottom corners of the fixed groove, the fixed ends of the first telescopic rods are fixedly connected to the base, and the first telescopic rods are electrically connected with the control device.

[0026] The concrete conveying pipe is communicated with the bottom of the concrete storage constant pressure box through the fixed groove.

[0027] Optionally, the first telescopic rod is communicated with a hydraulic pump, and the hydraulic pump is electrically connected with 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] Adjusting the height of the simulated construction system.

[0043] Adjusting the height of the concrete storage system by adjusting the height difference between the discharging end of the concrete storage system and the discharge port, and cooperating with the constant pressure output assembly, so that the speed of the concrete flowing into the simulated construction system is zero.

[0044] Fixing the height of the concrete storage system.

[0045] Adjusting the speed of the concrete flowing into the simulated construction system by adjusting the constant pressure output assembly.

[0046] Injecting the concrete while injecting the solid wall slurry from the top of the simulated construction system, and the simulated construction system is lowered during the concrete injection process.

[0047] Changing the speed of the concrete flowing into the simulated construction system to explore the influence of different concrete flow-out speeds on the interface area.

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

[0049] In use, first adjust the height of the simulated construction system, then adjust the height of the concrete storage system, adjust the height difference between the discharging end of the concrete storage system and the discharge port, and cooperate with the constant pressure output assembly, so that the speed of the concrete flowing into the simulated construction system is zero. After the height of the concrete storage system is determined, adjust the speed of the concrete flowing into the simulated construction system by adjusting the constant pressure output assembly. Inject the concrete while injecting the solid wall slurry from the top of the simulated construction system, and the simulated construction system is lowered during the concrete injection process. Change the speed of the concrete flowing into the simulated construction system to explore the influence of different concrete flow-out speeds on the interface area.

[0050] Compared with the traditional way, the device can be repeatedly used, effectively simulating the construction process of the concrete cutoff wall, and directly observing the changes in the interface area between the concrete and the solid wall slurry during the pouring process of the concrete cutoff wall. The measured and recorded test phenomena and data reflect the actual process of the pouring of the concrete cutoff wall to a certain extent, providing beneficial reference and guidance for on-site construction, and having strong practicality and good popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor:

[0052] Figure 1 It is the structural schematic view of the indoor test simulation system of the application.

[0053] Figure 2 It is the structural schematic view of the concrete storage system of the application.

[0054] Figure 3 It is the structural schematic view of the simulation construction system of the application.

[0055] Figure 4 It is the front view of the indoor test simulation system of the application.

[0056] Figure 5 It is the local enlarged schematic view of the connecting part of the concrete delivery pipe of the application.

[0057] Figure 6 It is the enlarged schematic view of the inside of the simulation pouring box of the application.

[0058] Figure 7 It is the schematic view of the simulation pouring process of the application.

[0059] 1, a concrete storage constant pressure box; 2, a fixed groove; 3, a concrete delivery pipe; 4, a first telescopic rod; 5, a control device; 6, a base; 7, a top plate; 8, a supporting rod; 9, a simulation pouring box; 10, a fixed support; 11, a second telescopic rod; 12, a protection bracket; 13, a flange; 14, a steel strand; 15, a telescopic pipe; 16, a fixing bolt; 17, concrete; 18, a solid wall mud; 19, a hydraulic pump; 101, a concrete inlet; 102, a sealing cover; 103, a stirring fan; 104, an exhaust hole; 105, a pressurizing hole; 106, a pressure gauge; 301, a control valve; 302, a thread; 901, a mud inlet; 902, a mud outlet; 903, a connecting port; 1501, a limiting block; 1502, a limiting groove; 1503, a tension hole. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0061] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0062] Reference Figures 1 to 7 The application discloses an indoor test simulation device for concrete cutoff wall construction, comprising:

[0063] The concrete storage system and the simulation construction system are connected through the concrete conveying pipe 3, and are arranged at two ends of the adjusting device.

[0064] 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.

[0065] The concrete storage system is used for storing and outputting the concrete 17.

[0066] The constant-pressure output assembly is arranged in the concrete storage system and is used for outputting the concrete 17.

[0067] The grouting mechanism for inputting the solid wall slurry 18 is arranged in the simulation construction system, and the movable discharge port is arranged in the simulation construction system and is in communication with the concrete conveying pipe 3.

[0068] 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.

[0069] The present application comprises the concrete storage system, the simulation construction system, the adjusting device and the concrete conveying pipe 3.

[0070] In use, the height of the simulation construction system is first adjusted, and then the height of the concrete storage system is adjusted, the height difference between the discharge end of the concrete storage system and the discharge port is adjusted, and the constant-pressure output assembly is used to make the flow rate of the concrete 17 in the concrete storage system into the simulation construction system be zero. After the height of the concrete storage system is determined, the constant-pressure output assembly is adjusted to adjust the flow rate of the concrete 17 into the simulation construction system. The concrete 17 is injected, and the solid wall slurry 18 is injected from the top of the simulation construction system at the same time, and the simulation construction system is lowered during the injection of the concrete 17. The flow rate of the concrete 17 into the simulation construction system is changed to explore the influence of different concrete flow rates on the interface region.

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

[0072] The concrete storage constant-pressure box 1 is provided with the concrete inlet 101 at the top, the sealing cover 102 is sealingly connected to the concrete inlet 101, the pressurizing hole 105 and the air pressure gauge 106 are connected to one side of the sealing cover 102, and the exhaust hole 104 is connected to the other side of the sealing cover 102.

[0073] The exhaust hole 104, the pressurizing hole 105 and the air pressure gauge 106 constitute the constant-pressure output assembly.

[0074] The stirring part is arranged in the concrete storage constant-pressure box 1.

[0075] One end of the concrete conveying pipe 3 is in communication with the bottom of the concrete storage constant-pressure box 1.

[0076] As an optional implementation, the stirring part comprises a stirring fan 103, which is rotationally arranged in the concrete storage constant pressure tank 1.

[0077] The concrete storage system comprises the concrete storage constant pressure tank 1.

[0078] The concrete storage constant pressure tank 1 is in a cylindrical structure, and the specific size can be adjusted according to the test scheme.

[0079] Further, the concrete storage constant pressure tank 1 is provided with a concrete inlet 101 on the side wall and is sealed by a matched sealing cover 102. The concrete storage constant pressure tank 1 is provided with an exhaust hole 104, a pressurizing hole 105 and a pressure gauge 106 on the top of two sides, which can effectively adjust the pressure inside the concrete storage constant pressure tank 1. The concrete storage constant pressure tank 1 is provided with a stirring fan 103 inside, which is used to slow down the solidification speed of the concrete 17 in the concrete storage constant pressure tank 1.

[0080] As an optional implementation, the adjusting device comprises:

[0081] The fixed end of the first lifting end and the fixed end of the second lifting end are respectively fixedly connected on two sides of the base 6.

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

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

[0084] The fixed groove 2 is fixed at the bottom of the concrete storage constant pressure tank 1, and the bottom corners of the fixed groove 2 are respectively fixedly connected with the movable ends of the first telescopic rods 4. The fixed ends of the first telescopic rods 4 are fixedly connected with the base 6, and the first telescopic rods 4 are electrically connected with the control device 5.

[0085] The concrete conveying pipe 3 passes through the fixed groove 2 and is in communication with the bottom of the concrete storage constant pressure tank 1.

[0086] As an optional implementation, 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.

[0087] The concrete storage constant pressure tank 1 is placed above the fixed groove 2, the fixed groove 2 is connected with the first telescopic rod 4, the hydraulic pump 19 is arranged below the first telescopic rod 4, and the spacing of the fixed groove 2 is determined by the size of the concrete storage constant pressure tank 1.

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

[0089] The simulation pouring box 9 is provided with a slurry inlet 901 and a slurry outlet 902 on the top of two sides, which are used to inject the solid wall slurry 18 on the top of the simulation pouring box 9.

[0090] The slurry inlet 901 is in communication with the slurry outlet end of the grouting mechanism.

[0091] The bottom of the simulation pouring box 9 is provided with a connecting port 903 for communicating with the concrete delivery pipe 3.

[0092] One end of the telescopic pipe 15 is communicated with the connecting port 903, and the other end of the telescopic pipe 15 is arranged in a lifting manner. The telescopic pipe 15 is hollow, and is located in the simulation pouring box 9.

[0093] The top of the telescopic pipe 15 serves as a discharge port of the 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 bottom of the top plate 7 is fixed to the base 6 through the support rods 8 at four corners, respectively.

[0095] The telescopic pipe 15 includes a plurality of sleeve pipes coaxially sleeved from inside to outside. Adjacent two sleeve pipes are slidably limited and matched through the limiting block 1501 and the limiting groove 1502. The top of the sleeve pipe located at the top is provided with a tension hole 1503 connected with the steel strand 14.

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

[0097] The protection support 12 is arranged below the simulation pouring box 9, and the protection support 12 is fixed to the base 6.

[0098] The simulation pouring box 9 is a cylindrical structure, is made of transparent plastic material, and specific dimensions can be adjusted according to a test scheme. Test personnel can clearly see the inside of the simulation pouring box 9 from the outside, and can observe and record specific conditions of the interface region between the concrete 17 and the solid wall mud 18 in the simulation pouring process.

[0099] The telescopic pipe 15 is arranged in the simulation pouring box 9, and the telescopic pipe 15 is a hollow cylindrical structure. The specific dimensions are determined by a test scheme. The top and the bottom of each section of the telescopic pipe 15 are respectively provided with the limiting block 1501 and the limiting groove 1502, so as to avoid stretching deformation of the telescopic pipe 15 in the test process. The bottom of the telescopic pipe 15 is connected with the flange 13 in a welding manner, and the flange 13 is connected to the bottom of the simulation pouring box 9 by using the fixing bolt 16. After the connection is completed, the airtightness of the simulation pouring box 9 as a whole needs to be detected.

[0100] The bottom of the simulation pouring box 9 is provided with the connecting port 903, the flange 13 is arranged at the connecting port 903, and one end of the concrete delivery pipe 3 is connected with the flange 13 in a threaded manner.

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

[0102] The fixed support 10 is fixedly connected with the bottom of the simulation pouring box 9, the bottom of the fixed support 10 is fixedly connected with the movable end of the second telescopic rod 11 respectively, 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.

[0103] As an optional implementation, 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 connected with a flange 13, and the flange 13 is fixed on the bottom of the simulation pouring box 9. The concrete conveying pipe 3 is communicated with the telescopic pipe 15 in the simulation pouring box 9 through the flange 13.

[0104] The flange 13 is fixedly connected with the bottom of the simulation pouring box 9 through the fixing bolt 16.

[0105] The simulation pouring box 9 is placed above the fixed support 10, and the fixed support 10 is connected with the second telescopic rod 11. The sectional dimension of the fixed support 10 should be greater than the bottom surface of the simulation pouring box 9, a hole is arranged in the middle part of the fixed support 10, the diameter of the hole is slightly greater than the connecting port of the bottom of the simulation pouring box 9, and the concrete conveying pipe 3 is connected with the simulation pouring box 9. The top plate 7 and the base 6 are connected in a welding mode, and the interval between the top plate 7 and the base 6 is determined according to the dimension of the simulation pouring box 9. When the interval is too high, the number or sectional dimension of the support rod 8 can be appropriately increased.

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

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

[0108] A use method of the indoor test simulation device for concrete diaphragm wall construction, the use method comprises the following steps:

[0109] The height of the simulation construction system is adjusted.

[0110] The height of the concrete storage system is adjusted, the height difference between the discharging end of the concrete storage system and the discharging port is adjusted, and the constant pressure output assembly is matched, so that the flow rate of the concrete 17 in the concrete storage system into the simulation construction system is zero.

[0111] The height of the concrete storage system is fixed.

[0112] The flow rate of the concrete 17 into the simulation construction system is adjusted by adjusting the constant pressure output assembly.

[0113] The concrete 17 is injected while the solid wall mud 18 is injected from the top of the simulated construction system. The simulated construction system is lowered during the injection of the concrete 17.

[0114] The speed of the concrete 17 flowing into the simulated construction system is changed to explore the influence of different concrete outflow speeds on the interface region.

[0115] The use of the device specifically includes the following working steps:

[0116] S1, design a test scheme, determine the concrete mix ratio, solid wall mud type, concrete outflow speed, simulated pouring box size, and corresponding concrete conveying pipe and telescopic pipe size that need to be simulated.

[0117] S2, assemble the equipment, adjust the second telescopic rod 11 to the appropriate position according to the size of the simulated pouring box 9, 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 tank 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, and perform multiple waterproof tests on the assembled equipment to drain all solutions inside the equipment.

[0119] S4, prepare the concrete 17 and the solid wall mud 18, close the control valve 301, pour the concrete 17 into the concrete storage constant pressure tank 1, close the concrete inlet 101, and open the stirring fan 103. At the same time, the solid wall mud 18 is injected into the simulated pouring box 9.

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

[0121] S6, according to the test scheme, determine the concrete outflow speed, set the specified pressure in the concrete storage constant pressure tank 1. According to formula (1), calculate the simulated pouring box lowering speed, and set the corresponding speed in the control device 5.

[0122] S7, turn on the high-frequency camera, open the control valve 301, and control the simulated pouring box 9 to slowly and uniformly descend. In the simulated construction process test, measure and record the flow rate change of the solid wall mud 18 at the corresponding position, and sample and preserve the materials at the interface region of the concrete 17 and the solid wall mud 18 at different times.

[0123] S8, after the pouring is completed, clean the simulated pouring box 9, the concrete storage constant pressure tank 1, and the concrete conveying pipe 3 before the concrete 17 is initially set, repeat steps S2-S7, adjust the internal pressure of the concrete storage constant pressure tank 1, and explore the influence of different concrete outflow speeds on the interface region.

[0124] According to the test scheme, the corresponding concrete 17 and solid wall mud 18 are prepared, the concrete 17 is poured into the inside of the concrete storage constant pressure box 1, after the concrete inlet 101 is closed, the stirring fan 103 is started. Part of the concrete 17 is poured into the bottom of the simulated pouring box 9, the initial height of the concrete 17 should exceed the top of the telescopic pipe 15 (in the fully contracted state), the prepared solid wall mud 18 is injected into the simulated pouring box 9 through the mud inlet 901.

[0125] The control valve 301 is opened, the relative height (h) between the bottom of the concrete storage constant pressure box 1 and the top of the telescopic pipe 15 is adjusted through the regulating device 5, the problem that the concrete 17 flows slowly or is blocked in the concrete conveying pipe 3 due to friction can be effectively solved, it is ensured that the concrete 17 can flow smoothly into the simulated pouring box 9 and the outflow speed is close to zero, the height of the first telescopic rod 4 is fixed, and the control valve 301 is closed.

[0126] Specifically, according to the test scheme design, the outflow speed of the concrete 17 that needs to be simulated is selected, the relationship between the outflow speed of the concrete 17 and the internal pressure of the concrete storage constant pressure box 1 is calculated through pre-test, the pressurizing hole 105 and the exhaust hole 104 are adjusted, and it is ensured that the internal pressure of the concrete storage constant pressure box 1 meets the requirements of the test scheme. According to formula (1), the descending speed of the simulated pouring box 9 is calculated, and the continuity of the concrete pouring is ensured.

[0127] (1)

[0128] In the formula, v0 represents the corresponding moving speed (m / s) of the second telescopic rod 11. V represents the outflow speed (m / s) of the concrete. A0 represents the bottom area (m 2 ) of the simulated pouring box. A represents the cross-sectional area (m 2 ) of the concrete conveying pipe.

[0129] The speed of the second telescopic rod 11 is adjusted through the regulating device 5, at the same time, the control valve 301 is opened, the support 10 descends at a constant speed along with the second telescopic rod 11, the simulated pouring box 9 also slowly descends under the action of the self weight, the telescopic pipe 15 slowly elongates due to the tension of the steel strand 14, and the purpose of simulating the pouring of the concrete cutoff wall is achieved.

[0130] It is worth noting that the relative height (h) between the top of the telescopic pipe 15 and the bottom of the concrete storage constant pressure box 1 does not change during the elongation of the telescopic pipe 15, at the same time, the internal pressure of the concrete storage constant pressure box 1 also hardly changes during the pouring, so the outflow speed of the concrete 17 is consistent during the pouring. During the simulated pouring, the elongation of the telescopic pipe 15 has little influence on the region where the solid wall mud 18 and the concrete 17 meet, so the specific reaction of the region during the pouring of the concrete 17 can be effectively observed.

[0131] The indoor test simulation device further comprises a high-frequency camera, a flow rate tester and a sampling device.

[0132] The high-frequency camera is used to record the changes of the interface region between the concrete 17 and the solid wall mud 18 during the pouring process, the flow rate tester is used to measure the flow rate changes of the solid wall mud 18 at different positions during the pouring process, and samples of the interface region at different time points are extracted for composition analysis during the pouring process.

[0133] Further, after the connection of all components is completed, the device needs to be tested for overall waterproofness before the test, and the specific steps of the test are as follows:

[0134] S1, tap water is injected into the storage concrete constant pressure tank 1 and the simulation pouring tank 9, and the sealing cover 102 is used to close the concrete inlet 101.

[0135] S2, the control valve 301 of the concrete conveying pipe 3 is opened.

[0136] S3, whether there is solution seepage at the bottom of the simulation pouring tank 9 and the storage concrete constant pressure tank 1 is detected.

[0137] S4, if there is no solution seepage, the control valve 301 is closed.

[0138] S5, air is injected into the storage concrete constant pressure tank 1 through the pressurizing hole 105 to adjust the pressure inside the storage concrete constant pressure tank 1.

[0139] S6, the flow rate tester is used to test and record the flow rate of the end region of the expansion pipe 15.

[0140] S7, the steps S2-S6 are repeated to ensure that there is no solution seepage at the bottom under different air pressure conditions.

[0141] After the waterproof test of the entire device is completed, the control valve 301 is closed, and the water pumping equipment is used to drain all the solution inside the device.

[0142] The application provides a kind of indoor test simulation device of concrete cutoff wall construction and its using method, the equipment involved can be repeatedly used, effectively simulate the construction process of concrete cutoff wall, can directly observe the change of the junction area of concrete 17 and solid wall mud 18 in the concrete cutoff wall pouring process, also provides a kind of method for realizing concrete uniform speed pouring.Through using high frequency camera and flow measuring equipment, the influence of different flow speed of concrete in pouring process on the disturbance of the junction area of concrete 17 and solid wall mud 18 can be effectively recorded.Meanwhile, the size of simulation pouring box 9, the size of telescopic pipe 15, the type of concrete 17 and solid wall mud 18 involved in the application can be adjusted according to actual demand, have strong universality.The measured and recorded test phenomena and data reflect the actual process of concrete cutoff wall pouring to a certain extent, provide beneficial reference and guidance for field construction, have strong practicability and good popularization value.

[0143] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

[0144] The above-described embodiments are only preferred modes of the present application and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope of the present application as defined by the claims.

Claims

1. An indoor experimental simulation device for the construction of concrete anti-seepage walls, characterized in that, include: A concrete storage system and a simulated construction system are connected by a concrete conveying pipe (3), and the concrete storage system and the simulated construction system are set at both ends of the regulating device; 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; The concrete storage system is used for the storage and output of concrete (17); The concrete storage system is equipped with a constant pressure output component, which is used for the output of the concrete (17); The top of the simulated construction system is connected to a grouting mechanism for inputting solidified mud (18), and the simulated construction system is provided with a movable discharge port, which is connected to the concrete conveying pipe (3). During the concrete (17) injection process, the height difference between the discharge port and the bottom of the concrete storage system remains constant.

2. The indoor test simulation device for the construction of a concrete anti-seepage wall according to claim 1, characterized in that, The concrete storage system includes: A constant pressure box for storing concrete (1) has a concrete inlet (101) at the top. A sealing cover (102) is fitted on the concrete inlet (101). One side of the sealing cover (102) is connected to a pressurization hole (105) and a pressure gauge (106), and the other side of the sealing cover (102) is connected to an exhaust hole (104). The exhaust port (104), the pressurization port (105), and the pressure gauge (106) constitute the constant pressure output component; The constant pressure box for storing concrete (1) is equipped with a mixing unit; The bottom of the constant pressure box for storing concrete (1) is connected to one end of the concrete conveying pipe (3).

3. The indoor test simulation device for the construction of a concrete anti-seepage wall according to claim 2, characterized in that, The mixing unit includes a mixing fan (103), which is rotatably disposed inside the concrete storage constant pressure box (1).

4. The indoor test simulation device for the construction of a concrete anti-seepage wall according to claim 2, characterized in that, The regulating device includes: The base (6) has the fixed ends of the first lifting end and the second lifting end fixedly connected to both sides of the base (6); The base (6) is embedded with a control device (5) for controlling the first lifting end and the second lifting end.

5. The indoor test simulation device for the construction of a concrete anti-seepage wall according to claim 4, characterized in that, The first lifting end includes: The fixed groove (2) is fixed to the bottom of the concrete constant pressure box (1). The four corners of the bottom of the fixed groove (2) are respectively fixed to the movable end of the first telescopic rod (4). 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). 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).

6. The indoor test simulation device for the construction of a concrete anti-seepage wall according to claim 5, characterized in that, The first telescopic rod (4) is connected to a hydraulic pump (19), and the hydraulic pump (19) is electrically connected to the control device (5).

7. The indoor test simulation device for the construction of a concrete anti-seepage wall according to claim 4, characterized in that, The simulated construction system includes: A simulated casting box (9) has an inlet (901) and a outlet (902) connected to the top two sides of the simulated casting box (9). The inlet (901) and the outlet (902) are used to inject the solidified mud (18) into the top of the simulated casting box (9). The inlet (901) is connected to the outlet end of the grouting mechanism. The bottom of the simulated pouring box (9) is provided with a connection port (903) for communicating with the concrete conveying pipe (3); The connection port (903) is connected to one end of the telescopic pipe (15), the other end of the telescopic pipe (15) is raised and lowered, the telescopic pipe (15) is hollow, and the telescopic pipe (15) is located inside the simulated casting box (9); The top of the telescopic pipe (15) is used as the outlet for the concrete (17); The top of the telescopic tube (15) is fixed with one end of a steel strand (14), and the other end of the steel strand (14) is fixed with the bottom of the top plate (7). The four corners of the bottom of the top plate (7) are respectively fixed to the base (6) by support rods (8). 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 sleeve located at the top is provided with a tension hole (1503) connected to the steel strand (14). The bottom of the simulated pouring box (9) is connected to the movable end of the second lifting end; A protective bracket (12) is provided below the simulated casting box (9), and the protective bracket (12) is fixed on the base (6).

8. The indoor test simulation device for the construction of a concrete anti-seepage wall according to claim 7, characterized in that, The second lifting end includes: A fixed support (10) is fixedly connected to the bottom of the simulated casting box (9). The four corners of the bottom of the fixed support (10) are respectively fixed to the movable ends of the second telescopic rod (11). 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).

9. The indoor test simulation device for the construction of a concrete anti-seepage wall according to claim 7, characterized in that, 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); the thread (302) is threadedly connected to a flange (13), the flange (13) is fixed to the bottom of the simulated pouring box (9), and the concrete conveying pipe (3) is connected to the telescopic pipe (15) inside the simulated pouring box (9) through the flange (13); The flange (13) is fixed to the bottom of the simulated casting box (9) by fixing bolts (16).

10. A method of using an indoor test simulation device for the construction of a concrete cutoff wall, comprising using the indoor test simulation device for the construction of a concrete cutoff wall as described in any one of claims 1-9, characterized in that, Includes the following steps: Adjust the height of the simulated construction system; 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 speed at which the concrete (17) in the concrete storage system flows into the simulated construction system zero. The height of the concrete storage system is fixed; The flow rate of the concrete (17) into the simulated construction system is adjusted by regulating the constant pressure output component; While the concrete (17) is being injected, the wall-stabilizing slurry (18) is being injected from the top of the simulated construction system. During the injection of the concrete (17), the simulated construction system descends. The flow rate of the concrete (17) into the simulated construction system was varied to investigate the effect of different concrete outflow velocities on the interface area.

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