Water permeability detection device and detection method for concrete aqueduct joint

Abstract

The invention discloses a water permeability detection device and method for a concrete aqueduct joint in the field of hydraulic engineering, the detection device comprises an air bag belt, a flexible pressing plate and a pressing mechanism, a circle of air bag strip is arranged on the front face of a belt body of the air bag belt, and a water filling area with the front face open is defined by the air bag strip; the flexible pressing plate is used for being pressed on the back face of the belt body and pressing the air bag strips on the air bag belt on the inner walls of the two sides of the joint of the concrete aqueduct under the action of the pressing mechanism. During detection, the air bag belt is pressed and fixed to the joint of the concrete aqueduct through the pressing mechanism and the flexible pressing plate, the air bag strip is made to define a closed water filling area around the joint, the water leakage condition of the joint can be rapidly diagnosed by applying pressurized water into the water filling area, and compared with a traditional water storage detection mode, the water leakage condition of the joint can be rapidly diagnosed. The device can greatly reduce the water consumption, is simple to operate and convenient to install, and improves the efficiency of detecting the water permeability of the concrete aqueduct joint.

Description

Technical Field

[0001] The invention relates to the field of water conservancy projects, and in particular to a water permeability detection device and a detection method for concrete aqueduct joints. Background Art

[0002] As a water conveyance structure in water conservancy projects, aqueducts have high requirements for the seepage and leakage resistance of the trough body. In aqueduct construction projects, aqueduct construction is subject to many restrictions such as concrete material properties, construction methods, and construction budgets. At present, the construction is mainly carried out by pouring concrete in sections, and pouring concrete between the sections for connection after the concrete solidifies. This method of pouring concrete in stages will cause construction joints to form contact surfaces of concrete at different stages after the completion of the structural construction. In addition, due to the characteristics of thermal expansion and contraction of concrete materials, large-span aqueducts need to be equipped with expansion joints to reserve space for concrete deformation. In order to ensure that there will be no engineering accidents of water seepage and leakage in construction joints and expansion joints after the aqueduct is put into use, it is generally used in engineering to install copper water stops, rubber water stops and other water stop methods for protection. However, due to the influence of many factors such as water stop technology, construction quality and construction technology, expansion joints and construction joints with water stops installed may also leak.

[0003] At present, the conventional method for monitoring water leakage in aqueducts is mainly to carry out closed water flow tests at the ends of the aqueducts. First, the two ends of the aqueduct to be tested are closed with sandbags and waterproof geotextiles. After the closure is completed, water is poured into the aqueduct until the water level reaches the designed water level of the aqueduct. The aqueduct to be tested is then left to stand for 24 hours, and the water level changes in the aqueduct are observed. If the water level in the trough changes significantly, it is determined that there is water leakage in the construction joints or expansion joints of the aqueduct section. If there is no significant change in the water level in the trough, personnel are sent to climb outside the trough of the trough section to be tested with ropes, and the water leakage on the outer surface of the trough is checked by personnel observation. If there are obvious water flow marks or dripping on the outer surface of the trough, it is determined that there is water leakage in the construction joints and expansion joints of the aqueduct section; if no water flow marks are observed on the outer surface of the aqueduct and there is no dripping, it is determined that there is no water leakage in the construction joints and structural joints of the aqueduct section, and the anti-leakage construction quality is good.

[0004] The closed water flow test at the ends of the aqueduct first requires the blocking of both ends of the aqueduct, which requires the use of a large number of sandbags and manpower. After the blocking of both ends is completed, water needs to be injected into the trough to the designed water level, which consumes a lot of water resources. After the test is completed, the water needs to be drained, which is time-consuming and labor-intensive. In addition, since it is necessary to stand still for a day to observe the leakage, the test takes a long time, which is not conducive to the rapid detection of multiple sections of aqueducts. Under the premise that there is no obvious change in the water level in the trough, it is necessary to send manual cranes to the outside of the trough to observe the surface, which is relatively dangerous and difficult to form digital observation data, which is not conducive to the establishment of an information archive for the aqueduct. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies in the existing aqueduct water leakage detection, the technical problem to be solved by the present invention is to provide a simple and quick water permeability detection device and detection method for concrete aqueduct joints.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A water permeability detection device for a concrete aqueduct joint comprises an airbag belt, a flexible pressing plate and a clamping mechanism, wherein the airbag belt comprises a belt body and airbag strips arranged along the length direction on both sides of the front of the belt body, the airbag strips on both sides are connected end to end, and a water-filled area with an open front is enclosed on the front of the belt body, and the airbag belt is provided with a gas interface connected to the airbag strips, and a liquid interface connected to the water-filled area; the shape of the flexible pressing plate matches the cross-sectional profile of the inner wall of the concrete aqueduct, the flexible pressing plate is used to press on the back of the belt body, and under the action of the clamping mechanism, the airbag strips on both sides of the airbag belt are pressed against the inner walls on both sides of the joint of the concrete aqueduct.

[0008] Furthermore, the cross-section of the airbag strip when inflated is rectangular, the flexible pressing plate is a flexible steel plate, and the width of the flexible pressing plate is not less than the width of the airbag strip.

[0009] Furthermore, it also includes a water tank and a water pump. The liquid interface includes two, which are respectively arranged at the two ends of the airbag belt. The two liquid interfaces are connected to the water tank through a water pipe respectively, and a water pump is respectively arranged on the two water pipes.

[0010] Furthermore, the clamping mechanism includes multiple retractable adjustment rods, wherein the lateral adjustment rod is horizontally abutted between the two ends of the flexible pressure plate, the vertical adjustment rod is vertically abutted between the lateral adjustment rod and the bottom of the flexible pressure plate, and the oblique adjustment rod is abutted between the vertical adjustment rod and the side wall of the flexible pressure plate.

[0011] Furthermore, the lateral adjustment rod includes a threaded sleeve and two threaded rods respectively threadedly connected to the two ends of the threaded sleeve, and the thread rotation directions of the two threaded rods are opposite. The vertical adjustment rod and the oblique adjustment rod include a threaded sleeve, a force transmission rod rotatably connected to one end of the threaded sleeve, and a threaded rod threadedly connected to the other end of the threaded sleeve.

[0012] Furthermore, a socket is provided in the middle of the threaded sleeve of the lateral adjustment rod, the force transmission rod of the vertical adjustment rod is inserted into the socket, and the end of the force transmission rod of the oblique adjustment rod is hinged to the middle of the force transmission rod of the vertical adjustment rod.

[0013] Furthermore, the clamping mechanism also includes an end adjustment rod, which includes a threaded sleeve, a support seat hinged to the upper end of the threaded sleeve, and a threaded rod threadedly connected to the lower end of the threaded sleeve, and the end adjustment rod abuts between the two ends of the flexible pressure plate and the lower edge of the top boss of the aqueduct, wherein the support seat abuts on the lower edge of the top boss of the aqueduct.

[0014] Furthermore, it also includes a detection mechanism, which includes a track arranged on the periphery of the concrete aqueduct near the expansion joint and the joint, and a rail car that can run along the track, and the rail car is provided with a camera.

[0015] The water permeability detection method for concrete aqueduct joints comprises the above-mentioned water permeability detection device for concrete aqueduct joints, and further comprises the following steps:

[0016] Step 1: Grind the surface around the joint of the concrete aqueduct to be tested smooth, apply ointment on the surface where the airbag strip fits the inner wall of the aqueduct, and stick two airbag strips on the inner wall of the aqueduct on both sides of the joint;

[0017] Step 2: Use an air pump to inflate the airbag strip through the gas interface, so that the airbag strip swells and fits against the inner wall of the aqueduct, then stop inflating and close the gas interface, then press the flexible pressing plate on the back of the airbag belt, and apply pressure to the flexible pressing plate through the clamping device, so that the entire airbag belt is clamped and fixed on the inner wall of the aqueduct through the airbag strip;

[0018] Step 3: Use a water pump to fill water into the water filling area through the liquid interface to ensure that the water fills the entire water filling area and maintains a certain pressure;

[0019] Step 4: Determine the water permeability of the joints of the concrete aqueduct by observing whether there is water flowing out from the corresponding positions of the joints on the outer wall of the concrete aqueduct.

[0020] Furthermore, in step three, a liquid interface is provided at each end of the airbag belt, and the two liquid interfaces are connected to a water tank through a water pump respectively. Water is filled into the water-filled area in a manner of one liquid interface taking in water and another liquid interface discharging water. In step four, the water permeability of the joints of the concrete aqueduct is judged by observing the water level changes in the water tank; or by setting up tracks outside the concrete aqueduct, a camera on a rail car running along the tracks is used to observe whether the joints are leaking.

[0021] The beneficial effects of the present invention are: the airbag belt is compressed and fixed at the joint of the concrete aqueduct by using a clamping mechanism and a flexible pressing plate, so that the airbag strip is surrounded by the joint to form a closed water-filled area, and the water leakage of the joint can be quickly diagnosed by applying pressurized water to the water-filled area. Compared with the traditional water storage detection method, the device can greatly reduce water consumption, and is simple to operate and easy to install, thereby improving the efficiency of concrete aqueduct joint permeability detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a cross-sectional view of the airbag belt of the present invention being attached to the joint of the concrete aqueduct;

[0024] Figure 3 yes Figure 1 A magnified view of part A;

[0025] Figure 4 It is a schematic diagram of the detection mechanism of the two tracks of the present invention.

[0026] Marked in the figure are, 1-airbag belt, 2-flexible pressure plate, 3-pressing mechanism, 4-concrete aqueduct, 5-water tank, 6-water pump, 7-water pipe, 8-detection mechanism, 11-belt body, 12-airbag strip, 13-water filling area, 14-gas interface, 15-liquid interface, 31-lateral adjustment rod, 32-vertical adjustment rod, 33-oblique adjustment rod, 34-threaded sleeve, 35-threaded rod, 36-force transmission rod, 37-socket, 38-end adjustment rod, 39-support seat, 41-joint, 42-aqueduct top boss, 81-track, 82-rail car, 83-camera. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings.

[0028] It should be noted that if there are directional indication terms in the present invention, such as up, down, left, right, front, and back directions and orientation terms, they are for the purpose of facilitating the description of the relative position relationship between components, and are not specific to the absolute position of the related components or the position relationship between components. They are only used to explain the relative position relationship and movement of the components in a certain posture. If the specific posture changes, the directional indication will also change accordingly. If there are terms related to quantity in the present invention, such as "multiple", "multiple", "several", etc., they specifically refer to two or more.

[0029] like Figure 1-3As shown, the water permeability detection device for the joint of a concrete aqueduct of the present invention comprises an airbag belt 1, a flexible pressing plate 2 and a pressing mechanism 3. The airbag belt 1 comprises a belt body 11 and airbag strips 12 arranged along the length direction on both sides of the front of the belt body 11. The airbag strips 12 on both sides are connected end to end to enclose a water-filled area 13 with an open front on the front of the belt body 11. The airbag belt 1 is provided with a gas interface 14 connected to the airbag strips 12 and a liquid interface 15 connected to the water-filled area 13. The shape of the flexible pressing plate 2 matches the cross-sectional profile of the inner wall of the concrete aqueduct 4. The flexible pressing plate 2 is used to press on the back of the belt body 11, and under the action of the pressing mechanism 3, the airbag strips 12 on both sides of the airbag belt 1 are pressed against the inner walls on both sides of the joint 41 of the concrete aqueduct 4. The width of the water-filled area 13 in the middle of the airbag belt 1 should be greater than the width of the joint 41 of the concrete aqueduct 4, and the length should be adapted to the joint 41. The airbag strip 12 can be made of rubber material, and can expand elastically after being inflated to ensure a sealing effect. The flexible pressing plate 2 is preferably matched with the inner wall of the aqueduct, and needs to have a certain hardness, so as to be able to evenly transfer the force of the clamping mechanism 3 to the airbag belt 1, thereby ensuring that the airbag strip 12 of the entire airbag belt 1 can be closely attached to the inner wall of the concrete aqueduct 4 after being inflated.

[0030] The use process of the present invention is: first, the airbag belt 1 is laid at the joint 41 of the concrete aqueduct 4, and the airbag strips 12 on both sides of the belt body 11 are respectively located outside the two sides of the joint 41, and then the airbag strips 12 are inflated through the gas interface 14. Because the cross section of the aqueduct is an arc, after inflation, the airbag strips 12 can automatically fit on the inner wall of the aqueduct, and then the flexible pressing plate 2 is pressed on the back of the airbag belt 1, and the flexible pressing plate 2 is pressed by the clamping mechanism 3 to press and fix the airbag belt 1 on the inner wall of the aqueduct. At this time, the water-filled area 13 in the middle of the airbag belt 1 forms a closed cavity with the inner wall of the joint 41, and finally, pressurized water is injected into the water-filled area 13 through the liquid interface 15. By observing whether water leaks from the joint 41, the water permeability of the concrete aqueduct joint can be judged. For the high-altitude concrete aqueduct 4, a telescope or a camera with a support pole can be used to observe whether there is water leakage on the outer wall of the aqueduct.

[0031] Since the airtightness around the water-filled area 13 is mainly achieved by the airbag strip 12 and the inner wall of the aqueduct 4 being closely fitted, in order to enhance the sealing effect, the cross section of the airbag strip 12 is preferably set to be a rectangular cross section when filled with air, so that the contact area between the airbag strip 12 and the inner wall of the aqueduct 4 can be increased, thereby improving the sealing effect. In addition, the pressing effect on the airbag belt 1 will also affect the sealing between the airbag strip 12 and the inner wall of the aqueduct 4. Therefore, in order to make the pressing force uniform, the flexible pressing plate 2 is preferably made of a flexible steel plate, which has a high hardness and a certain bending performance, and can evenly transmit the force of the pressing mechanism 3 to the entire airbag belt 1, and can also undergo a certain bending deformation to adapt to the arc surface structure of the inner wall of the aqueduct 4, so that the airbag strip 12 and the inner wall of the aqueduct 4 are closely fitted. In addition, in order to prevent the airbag strip 12 from deforming to one side, the width of the flexible pressing plate 2 should not be less than the width of the airbag belt 1, so that the force on the airbag strip 12 is perpendicular to the inner wall of the aqueduct 4.

[0032] In order to facilitate water injection into the water-filled area 13, the present invention further includes a water tank 5 and a water pump 6. The liquid interface 15 includes two, which are respectively arranged at the two ends of the airbag belt 1. The two liquid interfaces 15 are respectively connected to the water tank 5 through a water pipe 7, and a water pump 6 is arranged on each of the two water pipes 7. The two water pumps 6 have opposite pumping directions so as to form a section of pressurized water flow in the water-filled area 13. By controlling the pumping power of the two water pumps 6, the water pressure in the water-filled area 13 can be adjusted, thereby more accurately controlling the detection conditions. In addition, since a water injection passage is formed, it is possible to directly judge whether the joint 41 is leaking by observing the water level in the water tank 5. If the water level in the water tank 5 continues to drop within a period of time after reaching the predetermined pressure, it means that there is a leak in the joint 41.

[0033] As for the clamping mechanism 3, the preferred solution adopted by the present invention is that the clamping mechanism 3 includes a plurality of retractable adjustment rods, wherein the transverse adjustment rod 31 is horizontally abutted between the two ends of the flexible pressing plate 2, the vertical adjustment rod 32 is vertically abutted between the transverse adjustment rod 31 and the bottom of the flexible pressing plate 2, and the oblique adjustment rod 33 is abutted between the vertical adjustment rod 32 and the side wall of the flexible pressing plate 2. The transverse adjustment rod 31 clamps and fixes the left and right ends of the airbag belt 1 through the flexible pressing plate 2, the vertical adjustment rod 32 presses and fixes the middle part of the airbag belt 1 through the flexible pressing plate 2, and the oblique adjustment rod 33 may include at least two, and the two sides of the vertical adjustment rod 32 are symmetrically arranged to clamp the airbag belt 1 against the side wall of the aqueduct 4.

[0034] As for the specific structural form of the adjustment rod, a pneumatic rod or a hydraulic rod can be used. In order to facilitate manual adjustment, the present invention preferably uses a threaded adjustment rod. Specifically, the lateral adjustment rod 31 includes a threaded sleeve 34 and two threaded rods 35 respectively connected to the two ends of the threaded sleeve 34, and the threaded rotation directions of the two threaded rods 35 are opposite. The vertical adjustment rod 32 and the oblique adjustment rod 33 include a threaded sleeve 34, a force transmission rod 36 connected to one end of the threaded sleeve 34, and a threaded rod 35 connected to the other end of the threaded sleeve 34. Because the lateral adjustment rod 31 needs to press the two ends of the airbag belt 1 at the same time, a double threaded rod structure is used. When the threaded sleeve 34 is rotated, the threaded rods 35 at both ends can be synchronously extended and retracted, thereby simultaneously pressing the airbag belts 1 on both sides. The vertical adjustment rod 32 and the oblique adjustment rod 33 are only one-way pressed, so only the threaded rod 35 is provided at one end of the threaded sleeve 34. In addition, when pressing the flexible pressing plate 2 , the vertical adjusting rod 32 and the oblique adjusting rod 33 both rely on the friction between the lateral adjusting rod 31 and the flexible pressing plate 2 to provide reverse supporting force.

[0035] Furthermore, a socket 37 is provided in the middle of the threaded sleeve 34 of the lateral adjustment rod 31, the force transmission rod 36 of the vertical adjustment rod 32 is inserted into the socket 37, and the end of the force transmission rod 36 of the oblique adjustment rod 33 is hinged with the middle of the force transmission rod 36 of the vertical adjustment rod 32. The vertical adjustment rod 32 and the oblique adjustment rod 33 are hinged together as a whole, and the whole is fixedly connected by inserting the force transmission rod 36 of the vertical adjustment rod 32 into the socket 37, so that the entire clamping mechanism 3 is more stable and reliable.

[0036] In addition, only relying on the friction between the lateral adjustment rod 31 and the flexible pressing plate 2 to press the flexible pressing plate 2 downward may result in insufficient pressing force. Therefore, a further solution is as follows: Figure 3 As shown, the clamping mechanism 3 also includes an end adjustment rod 38, which includes a threaded sleeve 34, a support seat 39 hinged to the upper end of the threaded sleeve 34, and a threaded rod 35 threadedly connected to the lower end of the threaded sleeve 34. The end adjustment rod 38 abuts between the two ends of the flexible pressing plate 2 and the lower edge of the top boss 42 of the aqueduct 4, wherein the support seat 39 abuts on the lower edge of the top boss 42 of the aqueduct 4. Because the lower edge of the top boss 42 of the aqueduct 4 is generally an inclined surface, the provision of a rotatable support seat 39 can increase the contact area between the support seat 39 and the lower edge of the top boss 42 of the aqueduct 4, thereby ensuring the stability of the support. The end adjustment rod 38 uses the fixed top boss 42 of the aqueduct 4 as a support base, and can stably press the two ends of the flexible pressing plate 2 and the airbag belt 1 downward to ensure the sealing performance of the airbag belt 1 and the inner wall of the aqueduct 4.

[0037] In order to conveniently observe whether there is water leakage in the joint 41 of the aqueduct 4, the present invention further provides a special detection mechanism 8, which includes a track 81 arranged on the periphery of the concrete aqueduct 4 near the joint 41, and a track car 82 running along the track 81, and a camera 83 is arranged on the track car 82. The track 81 is selected according to the site conditions. If it is convenient to install the whole set, a whole section of arc track is used. The two ends of the track 81 are fixed on the top bosses 42 of the aqueduct 4 on both sides, such as Figure 1 If it is not convenient to set, on both sides of the concrete aqueduct 4 on the top of the aqueduct 4 are hung on each of the arc-shaped track 81, such as Figure 4 As shown, the track 81 does not need to pass through the bottom of the concrete aqueduct 4, and the track car 82 can observe whether there is water leakage at the bottom of the aqueduct 4 at the lower part of the side of the aqueduct 4. The track car 82 can be restricted to move on the track 81 by multiple rollers to ensure the stability of operation. The track car 82 can be controlled by remote control and can record the track to facilitate the determination of the leakage location.

[0038] When using the above detection device to perform water permeability detection, the following steps can be followed:

[0039] Step 1: Polish the surface around the joint 41 of the concrete aqueduct 4 to be tested to make it smooth, apply ointment on the surface where the airbag strip 12 and the inner wall of the aqueduct 4 are in contact, and attach two airbag strips 12 to the inner walls of the aqueduct 4 on both sides of the joint respectively;

[0040] Step 2: Use an air pump to inflate the airbag strip 12 through the gas interface 14, so that the airbag strip 12 swells and fits against the inner wall of the aqueduct 4, then stop inflating and close the gas interface 14, then press the flexible pressing plate 2 on the back of the airbag belt 1, and apply pressure to the flexible pressing plate 2 through the clamping device, so that the airbag strip 12 is pressed and fixed on the inner wall of the aqueduct;

[0041] Step 3: Use the water pump 6 to fill water into the water filling area 13 through the liquid interface 15, ensuring that the water fills the entire water filling area 13 and maintains a certain pressure;

[0042] Step 4: Determine the water permeability of the joint 41 on the concrete aqueduct 4 by observing whether water flows out from the corresponding position of the joint 41 on the outer wall of the concrete aqueduct 4 .

[0043] Among them, applying ointment on the airbag strip 12 can, on the one hand, prevent the airbag strip 12 from being scratched by the inner wall of the aqueduct 4 due to excessive roughness during the expansion or compression of the airbag strip 12, and on the other hand, help fill the small gap between the airbag strip 12 and the inner wall of the aqueduct 4, thereby improving the sealing performance of the airbag strip 12 and the inner wall of the aqueduct 4. When the threaded adjustment rod is used to compress and support the flexible pressing plate 2, first install the transverse adjustment rod 31 so that its two ends are pressed against the two ends of the flexible pressing plate 2, and ensure that the socket 37 faces downward when the threaded sleeve 34 stops, and then install the vertical adjustment rod 32, first insert the upper end of the force transmission rod 36 of the vertical adjustment rod 32 into the socket 37, and then rotate the threaded sleeve 34 so that the threaded rod 35 at the lower end is pressed against the bottom flexible pressing plate 2, and finally adjust the angle of the oblique adjustment rod 33, and rotate the threaded sleeve 34 on it so that the threaded rod 35 is pressed against the side flexible pressing plate 2.

[0044] In step three, in order to better control the water pressure in the water-filled area 13, a liquid interface 15 is provided at each end of the airbag belt 1, and the two liquid interfaces 15 are connected to the water tank 5 through a water pump 6, respectively. The water is filled into the water-filled area 13 by using one liquid interface 15 for water intake and the other liquid interface 15 for water discharge. In this way, the water pressure in the water-filled area 13 can be adjusted by controlling the power of the two water pumps 6, which is convenient and quick. In step four, when it is inconvenient to directly observe whether the aqueduct 4 is leaking from the outside, the water permeability of the joint 41 can be judged by observing the water level change in the water tank 5. It is also possible to set up a track 81 on the periphery of the concrete aqueduct 4 and use a camera 83 on a rail car 82 running along the track 81 to observe whether the joint is leaking.

[0045] The present invention utilizes a clamping mechanism 3 and a flexible pressing plate 2 to clamp and fix the airbag belt 1 at the joint 41 of the concrete aqueduct 4, so that the airbag strip 12 is surrounded by the joint 41 to form a closed water-filled area 13. By applying pressurized water to the water-filled area 13, the water leakage of the joint 41 can be quickly diagnosed. Compared with the traditional water storage detection method, the device can greatly reduce the water consumption, and is simple to operate and easy to install, thereby improving the efficiency of the water permeability detection of the joint of the concrete aqueduct 4. It has good applicability and application value and can be promoted and applied in similar detections.

Claims

1. A water permeability detection device for concrete aqueduct joints, characterized in that: The invention comprises an airbag belt (1), a flexible pressing plate (2) and a pressing mechanism (3). The airbag belt (1) comprises a belt body (11) and airbag strips (12) arranged along the length direction of the belt body (11) on both sides of the front surface. The airbag strips (12) on both sides are connected end to end to enclose a water-filled area (13) with an open front on the front surface of the belt body (11). The airbag belt (1) is provided with a gas interface (14) connected to the airbag strips (12) and a liquid interface (15) connected to the water-filled area (13). The shape of the flexible pressing plate (2) matches the cross-sectional profile of the inner wall of the concrete aqueduct (4). The flexible pressing plate (2) is used to press on the back of the belt body (11) and, under the action of the pressing mechanism (3), press the airbag strips (12) on both sides of the airbag belt (1) against the inner walls on both sides of the joint (41) of the concrete aqueduct (4).

2. The water permeability detection device for concrete aqueduct joints according to claim 1, characterized in that: The cross-section of the airbag strip (12) when inflated is rectangular, the flexible pressing plate (2) is a flexible steel plate, and the width of the flexible pressing plate (2) is not less than the width of the airbag strip (1).

3. The water permeability detection device for concrete aqueduct joints according to claim 1, characterized in that: It also includes a water tank (5) and a water pump (6), wherein the liquid interface (15) includes two, which are respectively arranged at the two ends of the airbag belt (1), and the two liquid interfaces (15) are respectively connected to the water tank (5) through a water pipe (7), and a water pump (6) is respectively arranged on the two water pipes (7).

4. The water permeability detection device for concrete aqueduct joints according to claim 1, characterized in that: The clamping mechanism (3) comprises a plurality of retractable adjustment rods, wherein the lateral adjustment rod (31) is horizontally abutted between the two ends of the flexible pressure plate (2), the vertical adjustment rod (32) is vertically abutted between the lateral adjustment rod (31) and the bottom of the flexible pressure plate (2), and the oblique adjustment rod (33) is abutted between the vertical adjustment rod (32) and the side wall of the flexible pressure plate (2).

5. The water permeability detection device for concrete aqueduct joints according to claim 4, characterized in that: The lateral adjustment rod (31) comprises a threaded sleeve (34) and two threaded rods (35) respectively threadedly connected to the two ends of the threaded sleeve (34), and the threaded directions of the two threaded rods (35) are opposite. The vertical adjustment rod (32) and the oblique adjustment rod (33) comprise a threaded sleeve (34), a force transmission rod (36) rotatably connected to one end of the threaded sleeve (34), and a threaded rod (35) threadedly connected to the other end of the threaded sleeve (34).

6. The water permeability detection device for concrete aqueduct joints according to claim 5, characterized in that: A socket (37) is provided in the middle of the threaded sleeve (34) of the lateral adjustment rod (31), the force transmission rod (36) of the vertical adjustment rod (32) is inserted into the socket (37), and the end of the force transmission rod (36) of the oblique adjustment rod (33) is hinged to the middle of the force transmission rod (36) of the vertical adjustment rod (32).

7. The water permeability detection device for concrete aqueduct joints according to claim 4, characterized in that: The clamping mechanism (3) further comprises an end adjustment rod (38), wherein the end adjustment rod (38) comprises a threaded sleeve (34), a support seat (39) hinged to the upper end of the threaded sleeve (34), and a threaded rod (35) threadedly connected to the lower end of the threaded sleeve (34), wherein the end adjustment rod (38) abuts between the two ends of the flexible pressure plate (2) and the lower edge of the aqueduct top boss (42), wherein the support seat (39) abuts against the lower edge of the aqueduct top boss (42).

8. The water permeability detection device for concrete aqueduct joints according to any one of claims 1 to 7, characterized in that: The invention also comprises a detection mechanism (8), wherein the detection mechanism (8) comprises a track (81) arranged on the periphery of the concrete aqueduct (4) near the joint (41), and a track vehicle (82) running along the track (81), wherein a camera (83) is arranged on the track vehicle (82).

9. A method for detecting water permeability of concrete aqueduct joints, characterized in that: The water permeability detection device for concrete aqueduct joints according to any one of claims 1 to 8 further comprises the following steps: Step 1: polish the surface around the joint (41) of the concrete aqueduct (4) to be tested to make it smooth, apply ointment on the surface where the airbag strip (12) and the inner wall of the aqueduct are in contact, and stick two airbag strips (12) on the inner wall of the aqueduct on both sides of the joint respectively; Step 2: Use an air pump to inflate the airbag strip (12) through the gas interface (14) so ​​that the airbag strip (12) swells and fits against the inner wall of the aqueduct, then stop inflating and close the gas interface (14), then press the flexible pressing plate (2) against the back of the airbag belt (1), and apply pressure to the flexible pressing plate (2) through a clamping device so that the airbag strip (12) is clamped and fixed on the inner wall of the aqueduct; Step 3: Use the water pump (6) to fill the water filling area (13) through the liquid interface (15), ensuring that the water fills the entire water filling area (13) and maintains a certain pressure; Step 4: By observing whether water flows out from the corresponding position of the joint (41) on the outer wall of the concrete aqueduct (4), the water permeability of the joint (41) on the concrete aqueduct (4) is determined.

10. The water permeability detection method for concrete aqueduct joints according to claim 9, characterized in that: In step three, a liquid interface (15) is provided at each end of the airbag belt (1), and the two liquid interfaces (15) are connected to the water tank (5) through a water pump (6) respectively. Water is filled into the water filling area (13) in the manner of one liquid interface (15) taking in water and the other liquid interface (15) discharging water. In step four, the water permeability of the joint (41) is judged by observing the change of the water level in the water tank (5); or a track (81) is set up on the periphery of the concrete aqueduct (4), and a camera (83) on a track car (82) running along the track (81) is used to observe whether the joint is leaking.

Images