A multi-angle crack detection device for hydraulic engineering construction

Abstract

The application relates to a water conservancy project crack detection device, in particular to a water conservancy project construction multi-angle crack detection device, which comprises a movable cart, a supporting frame, supporting legs and a support arranged on the movable cart, a digital imaging crack detection instrument is fixed on the top of the supporting frame through bolts, and an inclined base with an adjustable inclination angle is arranged on the support, the application realizes vertical direction scanning coverage through the stroke guide groove arranged on the outer wall of the column body and the lifting mechanism driving the digital imaging camera, and the overall coverage of the detection area is ensured; the key lies in that when the camera runs to the top and bottom positions, the multi-angle shooting of the front and both sides of the crack is realized through a preset deflection mechanism, the design can capture the three-dimensional morphological characteristics of the crack under different illumination angles, the false positive recognition rate can be greatly reduced, high-quality data support is provided for the accurate extraction of crack characteristics, and the accuracy and reliability of water conservancy project crack detection are improved.

Description

Technical Field

[0001] This invention relates to a crack detection device for water conservancy projects, specifically a multi-angle crack detection device for water conservancy project construction. Background Technology

[0002] Water conservancy projects, such as dams, dikes, canals, and sluices, are core infrastructures for ensuring water resource regulation, flood control and disaster reduction, agricultural irrigation, and energy supply. Their structural safety is directly related to the safety of people's lives and property and the stability of the social economy. However, water conservancy project structures are exposed to complex environments such as water flow erosion, temperature changes, alternating wet and dry conditions, and foundation settlement for a long time, which makes them prone to cracking.

[0003] Cracks are a typical manifestation of structural damage in water conservancy projects. If they are not detected and treated in time, they will gradually develop into through-hole defects. On the one hand, cracks will aggravate water seepage, leading to material deterioration such as steel corrosion and concrete carbonization, which weakens the structural bearing capacity. On the other hand, severe cracks may cause structural instability, such as dam leakage and collapse, and dike piping and collapse. Therefore, accurate and efficient crack detection is the core link in the safety monitoring of water conservancy projects.

[0004] With the continuous advancement of technology, water conservancy projects have placed higher demands on the accuracy, efficiency, and automation of crack detection, prompting the development of more advanced crack detection devices. For example, by utilizing digital molding recognition technology, fiber optic sensor technology, and intelligent robot technology, rapid, accurate, and non-destructive detection of cracks in water conservancy projects can be achieved. These devices can monitor crack changes in real time and transmit data to a remote monitoring center for analysis and processing, providing stronger technical support for the safety management and maintenance of water conservancy projects.

[0005] Digital molding recognition technology was chosen for crack detection because it has many unique advantages over fiber optic sensor technology and intelligent robot technology. While fiber optic sensor technology can monitor structural strain and temperature in real time, it is complex to install, requires pre-embedded optical fibers, and is costly. Intelligent robot technology can enter complex areas for detection, but it is expensive and has strict environmental requirements. Digital molding recognition technology, on the other hand, uses high-resolution cameras to acquire images and accurately identifies cracks through image processing algorithms. It has advantages such as being non-contact, efficient, low-cost, and widely applicable. It does not damage the structure, can quickly obtain comprehensive crack information, and can be remotely analyzed and processed, making it particularly suitable for crack detection in large and complex structures such as hydraulic engineering projects.

[0006] While digital imaging technology has significant advantages in crack detection in hydraulic engineering, it has inherent flaws that are difficult to overcome. The problem of false positive identification is particularly prominent, which seriously affects the accuracy of the detection data. On the one hand, the appearance of crack morphology is highly dependent on the shooting angle. When the light is oblique or the shooting angle is tilted, the edge contrast of some fine cracks is reduced and the outline is blurred, making it impossible for the model to effectively extract features. On the other hand, for areas with large surface undulations, non-crack textures are easily misjudged as crack morphology.

[0007] On the other hand, interference factors in the complex environment of water conservancy projects further exacerbate the risk of misidentification: the natural texture of concrete surfaces, acquired pollution, environmental light and shadow and other non-crack features have visual forms that are highly similar to cracks, and existing algorithms have difficulty distinguishing them accurately, resulting in a large number of false positive cracks being included in the detection results. Such problems not only increase the workload of subsequent data verification, but may also mislead the judgment of crack development trends and interfere with the accuracy of structural safety assessment. Summary of the Invention

[0008] The purpose of this invention is to provide a multi-angle crack detection device for water conservancy engineering construction, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A multi-angle crack detection device for water conservancy engineering construction includes a mobile trolley and a support frame, support legs and a support mounted on the mobile trolley. A digital imaging crack detection instrument is fixed to the top of the support frame by bolts. An adjustable tilting base is mounted on the support. A deflection support mechanism and a column mounted above the deflection support mechanism are fixedly connected to the top of the tilting base. The multi-angle crack detection mechanism is mounted on the column.

[0011] The multi-angle crack detection mechanism includes a multi-angle imaging mechanism slidably mounted on the outer wall of the column, a lifting mechanism fixedly connected to the top of the column, a stroke control mechanism fixedly connected to the outer wall of the column, a deflection support mechanism for guiding and supporting the column, a lifting mechanism for driving the multi-angle imaging mechanism to move up and down when it is in motion, a stroke control mechanism for controlling the start and stop of the lifting mechanism and the switching between lifting and lowering, and a digital imaging crack detection instrument for remote data communication with the multi-angle imaging mechanism.

[0012] The multi-angle crack detection device for water conservancy engineering construction described above: the deflection support mechanism includes a support base fixedly connected to the inclined base, and a rotating center groove and an arc-shaped sliding groove opened on the support base, wherein the rotating center groove and the arc-shaped sliding groove are concentrically designed.

[0013] The multi-angle crack detection device for water conservancy engineering construction as described above: the multi-angle shooting mechanism includes a travel guide groove opened on the outer wall of the column and a ball slidably installed on the travel guide groove. An annular component is installed on the ball, and the annular component is slidably installed on the outer wall of the column through the ball.

[0014] The multi-angle crack detection device for water conservancy engineering construction as described above: the multi-angle shooting mechanism also includes an extension plate fixedly installed on one side of the annular part and a multi-stage telescopic cylinder rotatably installed at the bottom of the extension plate, and a limit column is fixedly installed at the bottom of the column.

[0015] The multi-angle crack detection device for water conservancy engineering construction described above: the bottom end of the multi-stage telescopic cylinder is rotatably mounted on the rotating center groove on the supporting chassis, and the limiting column is slidably mounted inside the arc-shaped sliding groove.

[0016] The multi-angle crack detection device for water conservancy engineering construction described above: a digital imaging camera is installed on the top of the extension plate, and the digital imaging camera communicates remotely with the digital imaging crack detection instrument.

[0017] The multi-angle crack detection device for water conservancy engineering construction as described above: the lifting mechanism includes a connecting plate fixedly installed on the top of the column and a lifting seat fixedly installed at one end of the connecting plate. A lifting platform is slidably installed on the lifting seat and a drive motor is provided at the bottom of the lifting seat for driving the lifting platform to move up and down.

[0018] The multi-angle crack detection device for water conservancy engineering construction described above includes a lifting mechanism that further includes a rotating connecting ring fixedly installed on one side of the lifting platform. The rotating connecting ring and the annular component are rotatably connected, and a top plate is fixedly installed at both the upper and lower ends of the annular component.

[0019] The multi-angle crack detection device for water conservancy engineering construction described above includes a stroke control mechanism consisting of a first stop-start controller, a second stop-start controller, a first switching controller, and a second switching controller fixedly installed on the outer wall of the column. The first stop-start controller communicates with the second stop-start controller to control the start and stop of the lifting mechanism. The first switching controller communicates to control the lifting mechanism to switch to a descending motion, and the second switching controller communicates to control the lifting mechanism to switch to an ascending motion. The top plates at the upper and lower ends of the annular component cooperate with the first stop-start controller, the second stop-start controller, the first switching controller, and the second switching controller.

[0020] Compared with existing technologies, the beneficial effects of this invention are as follows: by setting a travel guide groove on the outer wall of the column and combining it with a lifting mechanism to drive the digital imaging camera to complete the vertical scanning coverage, comprehensive coverage of the detection area is ensured; the key is that when the camera moves to the top and bottom positions, a preset deflection mechanism is used to achieve multi-angle shooting of the front and sides of the crack. This design can capture the three-dimensional morphological features of the crack under different lighting angles, which not only solves the problem of low contrast and blurred outline of fine crack edges under a single viewpoint, but also effectively distinguishes the differences between non-crack features such as concrete surface texture and water stains and real cracks through cross-verification of multi-directional images. Finally, through the fusion analysis of multi-angle images, the false positive recognition rate can be greatly reduced, providing high-quality data support for the accurate extraction of crack features in the future, and improving the accuracy and reliability of crack detection in water conservancy projects.

[0021] The invention also incorporates a stroke control mechanism into the lifting mechanism. When the digital imaging camera moves to a designated position, such as the top or bottom, a control switch is automatically triggered to switch the lifting mode, achieving precise positioning and efficient shooting control. At the same time, the bottom of the crack detection device is equipped with a tiltable base, which can flexibly adjust the angle to adapt to building surfaces with different slopes, thereby significantly improving the adaptability and accuracy of crack detection and effectively ensuring the reliability and comprehensiveness of the safety assessment of water conservancy engineering structures. Attached Figure Description

[0022] Figure 1 A schematic diagram of the overall structure of a multi-angle crack detection device for water conservancy engineering construction.

[0023] Figure 2 This is a schematic diagram of the overall structure from another angle in a multi-angle crack detection device for water conservancy engineering construction.

[0024] Figure 3 A schematic diagram of the structure of a multi-angle crack detection device for water conservancy engineering construction, including a mobile trolley, support frame, digital imaging crack detection instrument, support legs, supports, and inclined base.

[0025] Figure 4 A schematic diagram of the column, deflection support mechanism, and multi-angle crack detection mechanism in a multi-angle crack detection device for water conservancy engineering construction.

[0026] Figure 5 This is a schematic diagram of the deflection support mechanism, multi-angle imaging mechanism, and stroke control mechanism in a multi-angle crack detection device for water conservancy engineering construction.

[0027] Figure 6 A disassembled structural diagram of the deflection support mechanism, multi-angle imaging mechanism, and stroke control mechanism in a multi-angle crack detection device for water conservancy engineering construction.

[0028] Figure 7 A schematic diagram of the multi-angle imaging mechanism and stroke control mechanism in a multi-angle crack detection device for water conservancy engineering construction.

[0029] Figure 8 A disassembly diagram of the multi-angle imaging mechanism and stroke control mechanism in a multi-angle crack detection device for water conservancy engineering construction.

[0030] Figure 9 A schematic diagram of the column and stroke control mechanism in a multi-angle crack detection device for water conservancy engineering construction.

[0031] Figure 10 A schematic diagram of the lifting mechanism, ring frame, extension plate, and top plate structure in a multi-angle crack detection device for water conservancy engineering construction.

[0032] Figure 11 A schematic diagram of the lifting mechanism in a multi-angle crack detection device for water conservancy engineering construction.

[0033] In the diagram: 1. Mobile trolley; 2. Support frame; 3. Digital imaging crack detection instrument; 4. Support leg; 5. Support base; 6. Inclined base; 7. Support chassis; 8. Rotating center groove; 9. Arc-shaped sliding groove; 10. Column; 11. Limiting post; 12. Stroke guide groove; 13. Ring component; 14. Ball bearing; 15. Top plate; 16. Extension plate; 17. Multi-stage telescopic cylinder; 18. Digital imaging camera; 19. First stop-start controller; 20. Second stop-start controller; 21. First switching controller; 22. Second switching controller; 23. Connecting plate; 24. Lifting seat; 25. Lifting platform; 26. Drive motor; 27. Rotating connecting ring. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] Please see Figures 1-6 As an embodiment of the present invention, the multi-angle crack detection device for water conservancy engineering construction includes a mobile cart 1 and a support frame 2, support legs 4 and a support 5 provided on the mobile cart 1. A digital imaging crack detection instrument 3 is fixed to the top of the support frame 2 by bolts. An adjustable tilting base 6 is provided on the support 5. A deflection support mechanism and a column 10 provided above the deflection support mechanism are fixedly connected to the top of the tilting base 6. A multi-angle crack detection mechanism is provided on the column 10.

[0036] The multi-angle crack detection mechanism includes a multi-angle imaging mechanism slidably mounted on the outer wall of the column 10, a lifting mechanism fixedly connected to the top of the column 10, a stroke control mechanism fixedly connected to the outer wall of the column 10, a deflection support mechanism for guiding and supporting the column 10, a lifting mechanism for driving the multi-angle imaging mechanism to move up and down when it is in motion, a stroke control mechanism for controlling the start and stop of the lifting mechanism and the switching between lifting and lowering, and a digital imaging crack detection instrument 3 for remote data communication with the multi-angle imaging mechanism.

[0037] In this embodiment, the device is mounted on the mobile cart 1 to facilitate overall movement. The support leg 4 allows the entire device to be locked and supported after it has been moved to the designated location. The inclined base 6 can flexibly adjust its angle to adapt to building surfaces with different slopes, thereby significantly improving the adaptability and accuracy of crack detection and effectively ensuring the reliability and comprehensiveness of the safety assessment of water conservancy engineering structures.

[0038] During detection, a lifting mechanism drives a multi-angle imaging mechanism to move along a preset trajectory. When the multi-angle imaging mechanism reaches the top and bottom positions, the stroke control mechanism controls the lifting mechanism to switch lifting modes. During this process, the multi-angle imaging mechanism deflects, and the preset deflection mechanism enables multi-angle imaging of the crack from the front and sides. This design can capture the three-dimensional morphological features of the crack under different lighting angles, which not only solves the problem of low contrast and blurred outline of fine crack edges under a single viewpoint, but also effectively distinguishes the differences between non-crack features such as concrete surface texture and water stains and real cracks through cross-verification of multi-directional images. Finally, through the fusion analysis of multi-angle images, the false positive rate can be significantly reduced, providing high-quality data support for the accurate extraction of crack features and improving the accuracy and reliability of crack detection in water conservancy projects.

[0039] As a further embodiment of the present invention, the deflection support mechanism includes a support base 7 fixedly connected to the inclined base 6, and a rotation center groove 8 and an arc-shaped sliding groove 9 formed on the support base 7, wherein the rotation center groove 8 and the arc-shaped sliding groove 9 are designed concentrically.

[0040] In this embodiment, the support base 7 is fixed to the support base 7 by bolts, and the rotation center groove 8 and the arc-shaped sliding groove 9 are concentrically designed.

[0041] As a further embodiment of the present invention, the multi-angle shooting mechanism includes a travel guide groove 12 formed on the outer wall of the column 10 and a ball bearing 14 slidably mounted on the travel guide groove 12. An annular component 13 is mounted on the ball bearing 14, and the annular component 13 is slidably mounted on the outer wall of the column 10 via the ball bearing 14.

[0042] In this embodiment, the travel guide groove 12 is tangent to the outer wall of the column 10. The travel guide groove 12 is designed in three sections, with two corners. The corners between the three sections of the travel guide groove 12 are inclined corners. The ball 14 slides on the travel guide groove 12. When the annular member 13 slides on the travel guide groove 12, it drives the ball 14 to move synchronously. Whenever the ball 14 moves to the corner of the travel guide groove 12, the ball 14 will drive the annular member 13 to deflect.

[0043] As a further embodiment of the present invention, the multi-angle shooting mechanism also includes an extension plate 16 fixedly installed on one side of the annular component 13 and a multi-stage telescopic cylinder 17 rotatably installed at the bottom of the extension plate 16, and a limit post 11 fixedly installed at the bottom of the column 10.

[0044] In this embodiment, an extension plate 16 is fixed on one side of the annular component 13, and the multi-stage telescopic cylinder 17 is rotatably connected to the extension plate 16. The multi-stage telescopic cylinder 17 can extend and retract over a long distance and can follow the up and down movement of the extension plate 16 to extend and retract the applicable length. The limiting post 11 is located directly below the column body 10.

[0045] As a further embodiment of the present invention, the bottom end of the multi-stage telescopic cylinder 17 is rotatably mounted on the rotating center groove 8 on the supporting chassis 7, and the limiting post 11 is slidably mounted inside the arc-shaped sliding groove 9.

[0046] In this embodiment, the multi-stage telescopic cylinder 17 is rotatably mounted on the rotating center groove 8, and the limiting column 11 slides on the arc-shaped sliding groove 9, which can provide a guiding function for the movement of the column 10. When the annular part 13 deflects, due to the limitation of the extension plate 16, the extension plate 16 will be driven to rotate around the rotating center groove 8 as the central axis. At this time, the column 10 will slide and deflect in the direction of the arc-shaped sliding groove 9, and at the same time, the column 10 will also rotate around the rotating center groove 8 as the central axis. This enables the multi-angle shooting mechanism to always detect the direction of the crack after the angle deflection.

[0047] As a further embodiment of the present invention, a digital imaging camera 18 is provided on the top of the extension plate 16, and the digital imaging camera 18 communicates remotely with the digital imaging crack detection instrument 3.

[0048] In this embodiment, the digital imaging camera 18 performs crack formation detection and remotely transmits the obtained data to the digital imaging crack detection instrument 3 for data statistical analysis.

[0049] As a further embodiment of the present invention, the lifting mechanism includes a connecting plate 23 fixedly installed on the top of the column 10 and a lifting seat 24 fixedly installed on one end of the connecting plate 23. A lifting platform 25 is slidably installed on the lifting seat 24 and a drive motor 26 is provided at the bottom of the lifting seat 24 for driving the lifting platform 25 to perform lifting movements.

[0050] In this embodiment, the lifting seat 24 is fixed to one side of the column 10 by the connecting plate 23. The lifting seat 24 can always move with the column 10 and drive the lifting platform 25 to move up and down by the drive motor 26 at the bottom.

[0051] As a further embodiment of the present invention, the lifting mechanism includes a rotating connecting ring 27 fixedly installed on one side of the lifting platform 25. The rotating connecting ring 27 is rotatably connected to the annular component 13, and a top plate 15 is fixedly installed at both the upper and lower ends of the annular component 13.

[0052] In this embodiment, a rotating connecting ring 27 fixed on one side of the lifting platform 25 is sleeved around the annular part 13 and is rotatably connected to it.

[0053] As a further embodiment of the present invention, the stroke control mechanism includes a first stop-start controller 19, a second stop-start controller 20, a first switching controller 21, and a second switching controller 22 fixedly installed on the outer wall of the column 10. The first stop-start controller 19 communicates with the second stop-start controller 20 to control the start and stop of the lifting mechanism. The first switching controller 21 communicates to control the lifting mechanism to switch to a descending motion. The second switching controller 22 communicates to control the lifting mechanism to switch to an ascending motion. The top plates 15 provided at the upper and lower ends of the annular component 13 cooperate with the first stop-start controller 19, the second stop-start controller 20, the first switching controller 21, and the second switching controller 22.

[0054] In this embodiment, the top plates 15 at the upper and lower ends of the annular component 13 will cooperate with the first stop-start controller 19, the second stop-start controller 20, the first switching controller 21, and the second switching controller 22.

[0055] Please see Figure 5 , Figure 6 and Figure 7In the initial stage, after the annular component 13 slides to the top position for the first time, it will immediately pass through the first corner point of the travel guide groove 12 and deflect for the first time. At this time, the top plate 15 will trigger the first switching controller 21, which remotely controls the lifting mechanism to switch to descending motion. Subsequently, the annular component 13 will pass through the second corner point of the travel guide groove 12 and deflect for the second time. At this time, the top plate 15 will trigger the second switching controller 22, which remotely controls the lifting mechanism to switch to ascending motion. Then, the annular component 13 moves upward, so that the top plate 15 is in contact with the second stop-start controller 20. At this time, the second stop-start controller 20 remotely controls the lifting mechanism to close. The control logic of the first stop-start controller 19 and the second stop-start controller 20 is the same.

[0056] The above embodiments are exemplary and not restrictive. Therefore, any technical solutions that can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention are included within the scope of the present invention.

Claims

1. A hydraulic engineering construction multi-angle crack detection device, comprising a mobile cart (1) and a support frame (2), a support leg (4) and a support base (5) arranged on the mobile cart (1), a digital imaging crack detection instrument (3) is fixed on the top of the support frame (2) through bolts, and an adjustable inclination angle inclination base (6) is arranged on the support base (5), characterized in that, The top of the inclined base (6) is fixedly connected with a deflection supporting mechanism and a column (10) arranged above the deflection supporting mechanism, and a multi-angle crack detection mechanism is arranged on the column (10). The multi-angle crack detection mechanism comprises a multi-angle shooting mechanism slidingly installed on the outer wall of the column (10), a lifting mechanism fixedly connected to the top of the column (10), and a stroke control mechanism fixedly connected to the outer wall of the column (10), the deflection supporting mechanism is used for guiding and supporting the column (10), the lifting mechanism is used for driving the multi-angle shooting mechanism to move up and down when the lifting mechanism is actuated, and the stroke control mechanism is used for controlling the start and stop and switching of the lifting mechanism, and the digital imaging crack detector (3) and the multi-angle shooting mechanism remotely communicate data. The deflection supporting mechanism comprises a supporting base (7) fixedly connected to the inclined base (6) and a rotation center groove (8) and an arc-shaped sliding groove (9) formed in the supporting base (7), and the rotation center groove (8) and the arc-shaped sliding groove (9) are concentrically designed. The multi-angle shooting mechanism comprises a stroke guiding groove (12) formed in the outer wall of the column (10) and a ball (14) slidingly installed in the stroke guiding groove (12), and an annular member (13) is installed on the ball (14), and the annular member (13) is slidingly installed on the outer wall of the column (10) through the ball (14). When detecting, the multi-angle shooting mechanism moves along a preset track by the lifting mechanism, when the multi-angle shooting mechanism moves to the top and bottom positions, the stroke control mechanism controls the lifting mechanism to switch the lifting mode, and in this process, the multi-angle shooting mechanism is deflected, and a preset deflection mechanism realizes multi-angle shooting of the front and both sides of the crack. The stroke guiding groove (12) is tangent to the outer wall of the column (10), the stroke guiding groove (12) is designed in three sections, there are two corner points in the stroke guiding groove (12), the corner points between the three sections of the stroke guiding groove (12) are inclined corners, the ball (14) slides on the stroke guiding groove (12), and the annular member (13) slides on the stroke guiding groove (12) to drive the ball (14) to move synchronously. In the initial stage, when the annular member (13) slides to the top position for the first time, the annular member (13) immediately passes through the first corner point of the stroke guiding groove (12), the annular member (13) is deflected for the first time, the lifting mechanism is switched to downward movement, and then the annular member (13) passes through the second corner point of the stroke guiding groove (12), the annular member (13) is deflected for the second time, and the lifting mechanism is switched to upward movement.

2. The multi-angle crack detection device for hydraulic engineering construction of claim 1, wherein The multi-angle shooting mechanism further comprises an extension plate (16) fixedly installed on one side of the annular member (13) and a multi-stage telescopic cylinder (17) rotatably installed at the bottom of the extension plate (16), and a limiting column (11) is fixedly installed at the bottom of the column (10).

3. The multi-angle crack detection device for hydraulic engineering construction of claim 2, characterized in that, The bottom end of the multi-stage telescopic cylinder (17) is rotatably installed on the rotation center groove (8) of the supporting base (7), and the limiting column (11) is slidingly installed in the arc-shaped sliding groove (9).

4. The multi-angle crack detection device for hydraulic engineering construction of claim 3, characterized in that, The top of the extension plate (16) is provided with a digital imaging camera (18) which is in remote data communication with a digital imaging digital imaging crack detection instrument (3).

5. The multi-angle crack detection device for hydraulic engineering construction of claim 4, wherein, The lifting mechanism comprises a connecting disc (23) fixedly installed on the top of the column (10) and a lifting seat (24) fixedly installed on one end of the connecting disc (23), and a lifting platform (25) is slidingly installed on the lifting seat (24), and a driving motor (26) for driving the lifting platform (25) to perform lifting movement is arranged at the bottom of the lifting seat (24).

6. The multi-angle crack detection device for hydraulic engineering construction of claim 5, wherein The lifting mechanism further comprises a rotating connecting ring (27) fixedly installed on one side of the lifting platform (25), and the rotating connecting ring (27) is in rotating connection with the annular member (13), and the top and bottom ends of the annular member (13) are both fixedly installed with top plates (15).

7. The multi-angle crack detection device for hydraulic engineering construction of claim 6, wherein, The stroke control mechanism comprises a first start-stop controller (19), a second start-stop controller (20), a first switching controller (21) and a second switching controller (22) fixedly installed on the outer wall of the column (10), the first start-stop controller (19) and the second start-stop controller (20) are in communication to control the start and stop of the lifting mechanism, the first switching controller (21) is in communication to control the lifting mechanism to switch to downward movement, the second switching controller (22) is in communication to control the lifting mechanism to switch to upward movement, and the top plates (15) arranged at the top and bottom ends of the annular member (13) are all matched with the first start-stop controller (19), the second start-stop controller (20), the first switching controller (21) and the second switching controller (22).

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