A concrete anti-leakage test device

Abstract

A concrete anti-leakage test device relates to the technical field of concrete performance testing equipment. It is characterized in that: it includes a test mold and a clamping adsorption feeding device; the adsorption feeding device can put the concrete test block into the test mold or take it out from the test mold in an adsorption clamping manner; the test mold includes a pressurized cover cylinder and a middle cylinder with a hollow interlayer; a hollow interlayer is clamped between the inner ring wall and the outer ring wall, the inner ring wall is an inverted truncated cone with a larger diameter at the top and a smaller diameter at the bottom, and more than three strip-shaped through holes are annularly opened on the inner ring wall; a rubber airbag is arranged in the hollow interlayer, and the rubber airbag can expand and bulge out from the strip-shaped through hole in an inflated state to form a clamping air column; shield grease is filled between each clamping air column that passes through the inner ring wall. The present invention can not only solve the problem of poor sealing of the concrete anti-leakage test device, but also is easy to load and unload and does not require frequent cleaning of the test mold. It is suitable for use in batch tests, saving labor and being efficient.

Description

Technical Field

[0001] The invention relates to the technical field of concrete performance testing equipment, in particular to a concrete anti-leakage testing device. Background Art

[0002] The permeability of concrete is an important indicator for evaluating the durability of concrete. When conducting a permeability test of concrete, the sealing degree between the test block and the test mold will directly affect the accuracy of the test results. The existing sealing method relies on applying a colloid around the test mold, such as glass glue, rosin wax mixture or butter cement mixture as a sealing medium. The above-mentioned sealing medium is inconvenient to apply and difficult to apply evenly, and it is even more difficult to clean the test mold. In addition, when the test block is loaded into the test mold, a pressure device is required to force it in. When the test is completed and removed, the pressure device is also required to press the test block out again. The disassembly and assembly are extremely inconvenient, and the test process is time-consuming and laborious. Some existing test molds use a conical airbag as a sealing medium, but because the outer wall of the test block is not smooth, it is inevitable that there will be gaps when the airbag wraps test blocks of different sizes, and it is also easy to produce a poor seal.

[0003] In addition, the test is carried out in groups of 6 according to the standard requirements, and the anti-seepage performance test is carried out simultaneously. At the same time, according to the daily commission volume of the testing department, the existing anti-seepage performance testing equipment can carry out anti-seepage tests on up to 8 groups of 48 test blocks at a time. After the test is completed, the test blocks need to be transported to an outdoor retention site and retained for 3 days. The transportation process is laborious and requires a lot of manpower and working hours.

[0004] In view of this, the applicant has designed a concrete anti-leakage test device after research, which can not only solve the problem of poor sealing of concrete anti-leakage test devices, but also is easy to load and unload and does not require frequent cleaning of test molds. It is suitable for use in batch tests, saving labor and being efficient. Moreover, the device can perform concrete anti-permeability tests that meet the requirements of various standard methods, and can also perform concrete micro-crack water seepage tests, which is a multi-purpose machine. Summary of the invention

[0005] The purpose of the present invention is to provide a concrete anti-leakage test device to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: a concrete anti-leakage test device, comprising a test mold and a clamping and adsorption-type feeding device, wherein the clamping and adsorption-type feeding device is installed on the side of the test mold; the adsorption-type feeding device can put a concrete test block into the test mold or take it out from the test mold in an adsorption and clamping manner;

[0007] The test mold includes a pressurized cover tube and a middle tube with a hollow interlayer; the two ends of the middle tube are open, the middle tube includes an inner ring wall and an outer ring wall, a hollow interlayer is clamped between the inner ring wall and the outer ring wall, the inner ring wall is in the shape of an inverted frustum with a larger diameter at the top and a smaller diameter at the bottom, and more than three strip-shaped through holes are arranged in a ring shape on the inner ring wall; a rubber airbag is arranged in the hollow interlayer, and the rubber airbag can expand and bulge out from the strip-shaped through hole when inflated to form a clamping air column; shield grease is filled between each clamping air column passing through the inner ring wall; the pressurized cover tube can be installed at the upper end or the lower end of the middle tube; an air valve mounting hole and a water injection hole are arranged at the closed end of the pressurized cover tube, an exhaust air valve is installed in the air valve mounting hole, one end of a pressure water pipe is inserted into the water injection hole, and the other end of the pressure water pipe is connected to a pressure water injection pump.

[0008] Preferably, the clamping and adsorption loading device includes an upper mounting plate, a lower mounting plate, a lifting screw and a lifting drive device, the right ends of the upper mounting plate and the lower mounting plate are respectively fixedly mounted horizontally on the upper and lower parts of the middle cylinder; an upper screw guide hole and a lower screw guide hole are respectively penetrated on the upper mounting plate and the lower mounting plate, the lifting screw is penetrated and inserted into the upper screw guide hole and the lower screw guide hole, and the lifting screw is driven by the lifting drive device to move up and down along the upper screw guide hole and the lower screw guide hole; a lower screw stopper is installed at the lower end of the lifting screw, an upper screw stopper is installed at the upper part of the lifting screw, a cross arm is mounted on the upper end of the upper screw stopper, the cross arm is horizontally arranged and can rotate horizontally around the upper end of the lifting screw, and an inverted "convex" shaped slideway is provided on the cross arm; a movable pulley is arranged in the slideway, and the movable pulley can move horizontally along the slideway; a lifting adsorption mechanism and a hoop mechanism are fixed on the movable pulley.

[0009] Preferably, pulleys are respectively provided at the front and rear ends of the movable pulley, and the lifting and adsorption mechanism includes a lifting bolt and a strong suction cup; a threaded through hole is vertically opened in the middle of the movable pulley, and a lifting bolt is inserted in the threaded through hole, a handle is installed at the upper end of the lifting bolt, and the lower end of the lifting bolt is rotatably connected to the strong suction cup; the strong suction cup includes a suction cup fixing platform, a trumpet-shaped rubber suction cup body is installed below the suction cup fixing platform, an exhaust hole is opened on the suction cup fixing platform, one end of the exhaust hole is connected to the interior of the suction cup body, and the other end of the exhaust hole is connected to an exhaust pump, and an electric air valve is arranged in the exhaust hole.

[0010] Preferably, the hoop mechanism comprises a first outer hoop, a second outer hoop, three or more cables and four or more inner hoop arc plates, the first outer hoop and the second outer hoop are both semi-arc-shaped and can be assembled together to form a circular outer hoop body, and each inner hoop arc plate is installed on the inner wall of the first outer hoop and the second outer hoop through a spring arm;

[0011] The lower end of the cable is connected to the upper end surface of the outer hoop body, and the upper end of the cable is connected to the lower bottom surface of the pulley; each cable is arranged in a ring array;

[0012] The first outer hoop and the second outer hoop are fixed together by a first lock buckle and a second lock buckle respectively.

[0013] Preferably, the lifting drive device includes a composite wire sleeve, and the composite wire sleeve is installed at the lower end of the upper screw guide hole through the wire sleeve bearing, and the inner wall of the composite wire sleeve and the outer wall of the screw are meshed with each other for transmission; an annular external tooth surface is arranged on the outer peripheral wall of the lower end of the composite wire sleeve extending out of the upper screw guide hole; the annular external tooth surface is meshed with the driving gear for transmission, and the driving gear sleeve is mounted on the driving shaft, and the upper and lower ends of the driving shaft are respectively mounted on the upper mounting plate and the lower mounting plate through the upper shaft bearing and the lower shaft bearing; a driving warehouse is opened below the lower mounting plate, and a passive bevel gear is installed after the lower end of the driving shaft passes through the lower shaft bearing, the passive bevel gear is meshed with the active bevel gear, and the active bevel gear is mounted on the power input shaft, and the power input shaft is mounted on the side wall of the driving warehouse through the input shaft bearing, and the end of the power input shaft passing out of the driving warehouse is connected to a crank handle or a motor.

[0014] Preferably, an annular upper mounting flange and an annular lower mounting flange are respectively arranged at the upper and lower ends of the middle cylinder, and upper bolt holes and lower bolt holes are respectively opened on the upper mounting flange and the lower mounting flange; the pressurized cover cylinder is cylindrical, one end of the pressurized cover cylinder is a closed end, and the other end of the pressurized cover cylinder is an open end; an annular cover body flange is arranged at the open end of the pressurized cover cylinder, and cover body bolt holes are opened on the cover body flange; the cover body flange of the pressurized cover cylinder can be installed on the upper mounting flange or the lower mounting flange by installing bolts; annular sealing grooves are correspondingly opened on the connecting surfaces of the upper mounting flange, the lower mounting flange and the cover body flange, and a silicone sealing ring is arranged in the sealing groove.

[0015] Preferably, an inflation hole is opened on the outer ring wall of the middle cylinder, an inflation valve is installed in the inflation hole, the air inlet end of the inflation valve is connected to the inflation pump through an air pipe and a pressure gauge; the air outlet end of the inflation valve is connected to the air inlet of the rubber airbag.

[0016] Preferably, the telescopic portion of the clamping air column on the rubber airbag is in the shape of a corrugated telescopic tube.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The concrete anti-leakage test device of the present invention can not only solve the problem of poor sealing of the concrete anti-leakage test device, but also is easy to load and unload and does not require frequent cleaning of the test mold, and is suitable for use in batch tests, saving labor and being efficient. Moreover, the device can perform concrete anti-leakage performance tests that meet the requirements of various standard methods, and can also perform concrete micro-crack water seepage tests, which is a one-machine-multi-purpose device.

[0019] The present invention uses a longitudinal air column to fix the specimen and can also play the role of filling shield grease at intervals. The longitudinal air column structure is different from the cylindrical air column in the prior art. The cylindrical air column in the prior art not only has the function of fixing the specimen, but also uses the inner ring of the air column to fit and seal the side wall of the specimen, and is easily worn by the specimen or even leaks. When in use, the longitudinal air column can even clamp the position of the specimen and pre-store shield grease in advance. Even if the specimen is not coated with shield grease in advance, it can be directly inserted into the test mold. The shield grease pre-stored between the longitudinal air columns and the subsequent expansion of the longitudinal air column can complete the fixation and sealing of the specimen.

[0020] Shield tail sealing grease is the main material for shield tail sealing and waterproofing in shield machine construction. When the shield is excavating, the shield tail sealing grease with a certain pressure is filled into the gap of the shield tail brush (wire brush), which can form a solid sealing layer with the shield tail brush, thereby preventing fluids such as water and mortar outside the shield shell from entering the interior of the shield machine. Therefore, shield grease as a sealing material can form a dense grease layer between the test mold and the test piece with super strong adhesion. Shield grease will not solidify, and the loss rate is low. It is not like the colloid sealing material used in the prior art, which has the problem of difficulty in cleaning the test mold. In addition, the application of shield grease in this test can also protect the airbag and the inner wall of the test mold, and avoid damage to the test mold caused by the test piece after repeated tests. This device only needs to replenish the consumed shield grease as needed after each test, which is more convenient and economical to use.

[0021] In addition, this patent is equipped with a clamping and adsorption loading device, which can assist in the loading and unloading of the test blocks in this test, saving time and effort and greatly reducing the labor intensity of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention (excluding the rubber airbag and the test block);

[0023] Figure 2 for Figure 1 A partial enlarged view of

[0024] Figure 3 It is a top view of the hoop mechanism (without the cable);

[0025] Figure 4 Schematic diagram of the fixing structure of the test block in the middle cylinder (the double-dotted line indicates the rubber airbag, and the dotted line indicates the test block);

[0026] Figure 5 for Figure 4 A schematic cross-sectional view of

[0027] Figure 6 This is a schematic diagram of the structure of the rubber airbag clamping and fixing the test piece;

[0028] In the figure: 1, lifting screw; 2, upper screw stopper; 3, cross arm; 4, slideway; 5, moving pulley; 6, annular outer tooth surface; 7, composite wire sleeve; 8, upper screw guide hole; 9, wire sleeve bearing; 10, upper shaft bearing; 11, upper mounting plate; 12, driving gear; 13, driving shaft; 14, lower shaft bearing; 15, passive bevel gear; 16, input shaft bearing; 17, active bevel gear; 18, crank; 19, driving compartment; 20, lower screw guide hole; 21, lower screw stopper; 22, lower mounting plate; 23, lower bolt hole; 24, outer ring wall; 25, hollow interlayer; 26, strip through hole; 27, inner ring wall; 28, sealing groove; 29, lower Mounting flange; 30. Silicone sealing ring; 31. Upper mounting flange; 32. Mounting bolts; 33. Cover flange; 34. Pressurized cover tube; 35. Pressure water pipe; 36. Exhaust valve; 37. Upper bolt hole; 38. Lifting bolt; 39. Threaded through hole; 40. First outer hoop; 41. Pulley; 42. Cable; 43. Electric valve; 44. Suction cup body; 45. Hoop mechanism; 46. Suction cup fixing platform; 47. Handle; 48. Inner hoop arc plate; 49. Spring arm; 50. First locking buckle; 51. Second outer hoop; 52. Rubber airbag; 53. Test block; 54. Valve mounting hole; 55. Inflating valve; 56. Shield grease; 57. Clamping gas column. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figures 1 to 6 The present invention provides a technical solution: a concrete anti-leakage test device, comprising a test mold and a clamping and adsorption-type feeding device, wherein the clamping and adsorption-type feeding device is installed on the side of the test mold; the adsorption-type feeding device can put a concrete test block into the test mold or take it out from the test mold in an adsorption and clamping manner.

[0031] The test mold includes a pressurized cover tube and a middle tube with a hollow interlayer; the two ends of the middle tube are open, the middle tube includes an inner ring wall and an outer ring wall, a hollow interlayer is clamped between the inner ring wall and the outer ring wall, the inner ring wall is in the shape of an inverted truncated cone with a larger diameter at the top and a smaller diameter at the bottom, and more than three strip-shaped through holes are provided in a circular manner on the inner ring wall; a rubber airbag is provided in the hollow interlayer, and the rubber airbag can expand and bulge out from the strip-shaped through hole in the inflated state to form a clamped air column; an inflation hole is provided on the outer ring wall of the middle tube, and an inflation valve is installed in the inflation hole, and the air inlet end of the inflation valve is connected to the inflation pump through an air pipe and a pressure gauge; the air outlet end of the inflation valve is connected to the air inlet of the rubber airbag. The telescopic part of the clamped air column on the rubber airbag is in the shape of a corrugated telescopic tube. Shield grease is filled between each clamped air column passing through the inner ring wall.

[0032] The pressurized cover cylinder can be installed at the upper end or the lower end of the middle cylinder; the closed end of the pressurized cover cylinder is provided with an air valve installation hole and a water injection hole, an exhaust air valve is installed in the air valve installation hole, one end of a pressure water pipe is inserted into the water injection hole, and the other end of the pressure water pipe is connected to a pressure water injection pump.

[0033] An annular upper mounting flange and an annular lower mounting flange are respectively arranged at the upper and lower ends of the middle cylinder, and upper bolt holes and lower bolt holes are respectively opened on the upper mounting flange and the lower mounting flange; the pressurized cover cylinder is cylindrical, one end of the pressurized cover cylinder is a closed end, and the other end of the pressurized cover cylinder is an open end; an annular cover body flange is arranged at the open end of the pressurized cover cylinder, and cover body bolt holes are opened on the cover body flange; the cover body flange of the pressurized cover cylinder can be installed on the upper mounting flange or the lower mounting flange by means of mounting bolts; annular sealing grooves are correspondingly opened on the connecting surfaces of the upper mounting flange, the lower mounting flange and the cover body flange, and a silicone sealing ring is arranged in the sealing groove.

[0034] The clamping and adsorption type feeding device comprises an upper mounting plate, a lower mounting plate, a lifting screw and a lifting drive device, the right ends of the upper mounting plate and the lower mounting plate are respectively fixedly mounted horizontally on the upper and lower parts of the middle cylinder; an upper screw guide hole and a lower screw guide hole are respectively penetrated on the upper mounting plate and the lower mounting plate, the lifting screw is penetrated and inserted into the upper screw guide hole and the lower screw guide hole, and the lifting screw is driven by the lifting drive device to move up and down along the upper screw guide hole and the lower screw guide hole; a lower screw stopper is installed at the lower end of the lifting screw, an upper screw stopper is installed at the upper part of the lifting screw, a cross arm is mounted on the upper end of the upper screw stopper, the cross arm is horizontally arranged and can rotate horizontally around the upper end of the lifting screw, and an inverted "convex" shaped slideway is arranged on the cross arm; a moving pulley is arranged in the slideway, and the moving pulley can move horizontally along the slideway; a lifting adsorption mechanism and a hoop mechanism are fixed on the moving pulley.

[0035] Pulleys are respectively arranged at the front and rear ends of the movable pulley, and the lifting and adsorption mechanism comprises a lifting bolt and a strong suction cup; a threaded through hole is vertically opened in the middle of the movable pulley, and a lifting bolt is inserted in the threaded through hole, a handle is installed at the upper end of the lifting bolt, and the lower end of the lifting bolt is rotatably connected to the strong suction cup; the strong suction cup comprises a suction cup fixing platform, a trumpet-shaped rubber suction cup body is installed below the suction cup fixing platform, an exhaust hole is opened on the suction cup fixing platform, one end of the exhaust hole is connected to the interior of the suction cup body, and the other end of the exhaust hole is connected to an exhaust pump, and an electric air valve is arranged in the exhaust hole.

[0036] The hoop mechanism comprises a first outer hoop, a second outer hoop, three or more cables and four or more inner hoop arc plates. The first outer hoop and the second outer hoop are both semi-arc-shaped and can be assembled together to form a circular outer hoop body. Each inner hoop arc plate is installed on the inner wall of the first outer hoop and the second outer hoop through a spring arm.

[0037] The lower end of the cable is connected to the upper end surface of the outer hoop body, and the upper end of the cable is connected to the lower bottom surface of the pulley; each cable is arranged in a circular array. The first outer hoop and the second outer hoop are fixed together by a first lock buckle and a second lock buckle respectively.

[0038] The lifting drive device comprises a composite wire sleeve, which is installed at the lower end of the upper screw guide hole through a wire sleeve bearing, and the inner wall of the composite wire sleeve and the outer wall of the screw are meshed with each other for transmission; an annular outer tooth surface is arranged on the outer peripheral wall of the lower end of the composite wire sleeve extending out of the upper screw guide hole; the annular outer tooth surface is meshed with a driving gear for transmission, and the driving gear is sleeved on the driving shaft, and the upper and lower ends of the driving shaft are respectively installed on the upper mounting plate and the lower mounting plate through the upper shaft bearing and the lower shaft bearing; a driving warehouse is provided below the lower mounting plate, and a passive bevel gear is installed after the lower end of the driving shaft passes through the lower shaft bearing, and the passive bevel gear is meshed with the active bevel gear, and the active bevel gear is installed on the power input shaft, and the power input shaft is installed on the side wall of the driving warehouse through the input shaft bearing, and one end of the power input shaft passing out of the driving warehouse is connected to a crank handle or a motor.

[0039] The specific operation method is as follows:

[0040] First, carry out the preparatory work, open the air pump and the air valve to fill the rubber airbag with gas, so that the rubber airbag will expand, and the clamping air column will expand and fill, and the shield grease will be fully filled between each clamping air column.

[0041] Then rotate the extended end of the horizontal arm to the top of the test block, rotate the crank or start the motor to drive the drive shaft and the drive gear to rotate forward, mesh and drive the composite wire sleeve to rotate in the opposite direction, so that the lifting screw moves down along the upper screw guide hole and the lower screw guide hole until the suction cup body contacts the upper plane of the test piece. Open the first lock and the second lock of the hoop mechanism, so that the first outer hoop and the second outer hoop are in a split state, so that the first outer hoop and the second outer hoop are surrounded by the waist position of the test piece from the left and right sides, and each inner hoop arc plate is fitted to clamp the outer wall of the test piece, and then the first outer hoop and the second outer hoop are brought close to the middle to form a full circle at the same time, and the first lock and the second lock are buckled. At this time, the hoop mechanism can lock and fix the test piece.

[0042] Rotate the crank in the opposite direction or drive the motor in the opposite direction to drive the lifting screw upward until the bottom surface of the test piece is higher than the upper edge of the middle tube of the test mold, then rotate the cross arm and manually turn the handle to control the pulley and the test piece to be directly above the middle tube.

[0043] Start the electric air valve and the air pump, and suck the air in the suction cup through the air hole until the suction cup and the upper surface of the specimen generate a continuous negative pressure, and the specimen is sucked and fixed. Open the first lock and the second lock to release the specimen from the hoop mechanism, and then manually rotate the handle to drive the strong suction cup and the specimen downward with the lifting bolt until the specimen is fully inserted between the clamping air columns of the middle tube. At this time, continue to inflate the rubber airbag through the air pump until each clamping air column clamps the specimen. The degree of tightening can be judged by the pressure gauge to avoid overcharging or insufficient tightening force.

[0044] After completing the preparatory work, concrete leakage resistance test or concrete crack water permeability test can be carried out as needed.

[0045] (1) Concrete anti-leakage test

[0046] Fill the pressurized cover cylinder with water in advance, and then seal the pressurized cover cylinder at the lower end of the middle cylinder, leaving the upper end of the middle cylinder open. Open the exhaust valve and start the water injection pump to inject pressurized water into the pressurized cover cylinder through the pressure water pipe. The exhaust valve is closed during the water injection process. Then observe whether there is water seepage on the upper surface of the test block under different water pressures at the upper end of the middle cylinder, and then judge the anti-leakage level of the test block.

[0047] (2) Concrete crack water permeability test

[0048] Install the pressurized cover cylinder on the upper end of the middle cylinder (the lower end of the middle cylinder is open, and receives the water tray at the lower end), and the pressurized cover cylinder and the middle cylinder are sealed and connected; open the exhaust valve and start the water injection pump, and inject pressurized water into the pressurized cover cylinder through the pressure water pipe. After all the air in the pressurized cover cylinder is discharged, close the exhaust valve; then observe whether there is water seeping out from the bottom of the middle cylinder under different water pressures, and then judge whether there are cracks on the test block.

[0049] After completing any of the above tests, drain the liquid in the pressurized cover, open the pressurized cover, and appropriately release the gas in the rubber airbag to slightly loosen the test block. Then reverse the test block installation steps in the preparation work to remove the test block smoothly. Before the next test, the consumed shield grease can be replenished as needed.

[0050] In addition, it should be pointed out that shield grease is an extremely viscous paste, which contains a large amount of fiber, solid filler and high molecular polymer thickening material. Compared with ordinary grease, its composition and performance requirements are very different.

[0051] Shield grease is a key supporting material used to fill the shield tail brush area during shield tunnel construction. For high water pressure and large diameter shield construction, the shield tail sealing system is crucial. When the shield is excavating, it is necessary to inject sealing grease while advancing. Filling the gaps between the holes of the wire brush with a certain pressure of shield tail sealing grease can enhance the sealing performance of the wire brush and form a solid sealing layer to prevent the infiltration of mud, water, sand and soil. In addition, the dense grease layer formed by the adhesion between the shield grease and the steel plate and pipe segment also plays a role in anti-corrosion and lubrication. In short, the shield tail sealing grease can not only effectively isolate the mud and realize the normal excavation of the shield, but also protect the shield tail brush and other steel structural parts to avoid rust and reduce wear. It can be seen that the shield tail sealing grease has very important value in improving construction safety, ensuring project quality and work efficiency. The shield grease used in this patent can be a commercially available product or a separately configured qualified product that meets national standards. The shield grease model and performance indicators used by the applicant in the experiment are as follows:

[0052]

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A concrete anti-leakage test device, characterized in that: It includes a test mold and a clamping and adsorption-type loading device, wherein the clamping and adsorption-type loading device is installed on the side of the test mold; the adsorption-type loading device can put the concrete test block into the test mold or take it out from the test mold in an adsorption and clamping manner; The test mold includes a pressurized cover tube and a middle tube with a hollow interlayer; the two ends of the middle tube are open, the middle tube includes an inner ring wall and an outer ring wall, a hollow interlayer is clamped between the inner ring wall and the outer ring wall, the inner ring wall is in the shape of an inverted frustum with a larger diameter at the top and a smaller diameter at the bottom, and more than three strip-shaped through holes are arranged in a ring shape on the inner ring wall; a rubber airbag is arranged in the hollow interlayer, and the rubber airbag can expand and bulge out from the strip-shaped through hole when inflated to form a clamping air column; shield grease is filled between each clamping air column passing through the inner ring wall; the pressurized cover tube can be installed at the upper end or the lower end of the middle tube; an air valve mounting hole and a water injection hole are arranged at the closed end of the pressurized cover tube, an exhaust air valve is installed in the air valve mounting hole, one end of a pressure water pipe is inserted into the water injection hole, and the other end of the pressure water pipe is connected to a pressure water injection pump.

2. A concrete anti-leakage test device according to claim 1, characterized in that: The clamping and adsorption type feeding device comprises an upper mounting plate, a lower mounting plate, a lifting screw and a lifting drive device, the right ends of the upper mounting plate and the lower mounting plate are respectively fixedly mounted horizontally on the upper and lower parts of the middle cylinder; an upper screw guide hole and a lower screw guide hole are respectively penetrated on the upper mounting plate and the lower mounting plate, the lifting screw is penetrated and inserted into the upper screw guide hole and the lower screw guide hole, and the lifting screw is driven by the lifting drive device to move up and down along the upper screw guide hole and the lower screw guide hole; a lower screw stopper is installed at the lower end of the lifting screw, an upper screw stopper is installed at the upper part of the lifting screw, a cross arm is mounted on the upper end of the upper screw stopper, the cross arm is horizontally arranged and can rotate horizontally around the upper end of the lifting screw, and an inverted "convex" shaped slideway is arranged on the cross arm; a moving pulley is arranged in the slideway, and the moving pulley can move horizontally along the slideway; a lifting adsorption mechanism and a hoop mechanism are fixed on the moving pulley.

3. A concrete anti-leakage test device according to claim 2, characterized in that: Pulleys are respectively arranged at the front and rear ends of the movable pulley, and the lifting and adsorption mechanism comprises a lifting bolt and a strong suction cup; a threaded through hole is vertically opened in the middle of the movable pulley, and a lifting bolt is inserted in the threaded through hole, a handle is installed at the upper end of the lifting bolt, and the lower end of the lifting bolt is rotatably connected to the strong suction cup; the strong suction cup comprises a suction cup fixing platform, a trumpet-shaped rubber suction cup body is installed below the suction cup fixing platform, an exhaust hole is opened on the suction cup fixing platform, one end of the exhaust hole is connected to the interior of the suction cup body, and the other end of the exhaust hole is connected to an exhaust pump, and an electric air valve is arranged in the exhaust hole.

4. A concrete anti-leakage test device according to claim 3, characterized in that: The hoop mechanism comprises a first outer hoop, a second outer hoop, more than three cables and more than four inner hoop arc plates, the first outer hoop and the second outer hoop are both semi-arc-shaped and can be assembled together to form a circular outer hoop body, and each inner hoop arc plate is installed on the inner wall of the first outer hoop and the second outer hoop through a spring arm; The lower end of the cable is connected to the upper end surface of the outer hoop body, and the upper end of the cable is connected to the lower bottom surface of the pulley; each cable is arranged in a ring array; The first outer hoop and the second outer hoop are fixed together by a first lock buckle and a second lock buckle respectively.

5. A concrete anti-leakage test device according to claim 4, characterized in that: The lifting drive device comprises a composite wire sleeve, which is installed at the lower end of the upper screw guide hole through a wire sleeve bearing, and the inner wall of the composite wire sleeve and the outer wall of the screw are meshed with each other for transmission; an annular outer tooth surface is arranged on the outer peripheral wall of the lower end of the composite wire sleeve extending out of the upper screw guide hole; the annular outer tooth surface is meshed with a driving gear for transmission, and the driving gear is sleeved on the driving shaft, and the upper and lower ends of the driving shaft are respectively installed on the upper mounting plate and the lower mounting plate through the upper shaft bearing and the lower shaft bearing; a driving warehouse is provided below the lower mounting plate, and a passive bevel gear is installed after the lower end of the driving shaft passes through the lower shaft bearing, and the passive bevel gear is meshed with the active bevel gear, and the active bevel gear is installed on the power input shaft, and the power input shaft is installed on the side wall of the driving warehouse through the input shaft bearing, and one end of the power input shaft passing out of the driving warehouse is connected to a crank handle or a motor.

6. A concrete anti-leakage test device according to claim 5, characterized in that: An annular upper mounting flange and an annular lower mounting flange are respectively arranged at the upper and lower ends of the middle cylinder, and upper bolt holes and lower bolt holes are respectively opened on the upper mounting flange and the lower mounting flange; the pressurized cover cylinder is cylindrical, one end of the pressurized cover cylinder is a closed end, and the other end of the pressurized cover cylinder is an open end; an annular cover body flange is arranged at the open end of the pressurized cover cylinder, and cover body bolt holes are opened on the cover body flange; the cover body flange of the pressurized cover cylinder can be installed on the upper mounting flange or the lower mounting flange by means of mounting bolts; annular sealing grooves are correspondingly opened on the connecting surfaces of the upper mounting flange, the lower mounting flange and the cover body flange, and a silicone sealing ring is arranged in the sealing groove.

7. A concrete anti-leakage test device according to claim 6, characterized in that: An inflation hole is provided on the outer ring wall of the middle cylinder, and an inflation valve is installed in the inflation hole. The air inlet end of the inflation valve is connected to the inflation pump through an air pipe and a pressure gauge; the air outlet end of the inflation valve is connected to the air inlet of the rubber airbag.

8. A concrete anti-leakage test device according to claim 7, characterized in that: The telescopic portion of the clamping air column on the rubber airbag is in the shape of a corrugated telescopic tube.

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