An underwater steel structure stress detection device and detection method

Abstract

The application relates to the technical field of stress detection, in particular to underwater steel structure stress detection equipment and a detection method, which comprises a mounting shell, a mounting base, rotating shafts, a fixing frame and an extension mechanism. The fixing frame is connected to the surface of the mounting base, the rotating shafts are rotationally connected to the fixing frame, and the rotating shafts are provided with moving wheels. The fixing frame is provided with a first driving assembly, and the mounting base is provided with a clamping mechanism. The mounting shell is connected to the mounting base, the mounting shell is provided with a control mechanism, the control mechanism is provided with a stress detector, the extension mechanism is connected to the mounting base. The control mechanism controls the clamping mechanism, the extension mechanism and the first driving assembly, the stress detector is provided with a strain gauge, and the strain gauge is connected to the extension mechanism. In the application, the rotating shafts and the moving wheels are driven to rotate by the first driving assembly, the moving wheels and the rollers in the clamping mechanism are pressed against the surface of a steel structure body, and the detection equipment can move along the steel structure body when the moving wheels rotate; the equipment can be moved to an underwater detection position, and the position of stress detection can be adjusted, so that the equipment is more convenient and flexible to use.

Description

Technical Field

[0001] This invention belongs to the field of stress detection technology, and relates to an underwater steel structure stress detection device and detection method. Background Technology

[0002] When an object deforms due to external factors such as force, humidity, and temperature changes, internal forces are generated between its various parts. The internal force per unit area is called stress. Stress can cause cracking, warping, or deformation of the object, further inducing safety accidents. Therefore, it is necessary to perform stress testing on objects. For large steel bridges, gates, steel roofs, and other truss structures, stress testing is required not only during the production process of assembled structural components but also after assembly and during use to ensure safety and reliability, thereby preventing safety accidents.

[0003] Chinese Patent CN116295977A discloses an underwater steel structure stress detection device. This device includes a stainless steel shell, a mobile power supply, a stress acquisition and emission module, a control component, and several strain gauge groups. The stress acquisition and emission module is fixed to a bracket inside the stainless steel shell, and the mobile power supply is also secured within the stainless steel shell via the bracket. The mobile power supply is electrically connected to the stress acquisition and emission module and the control component. Several strain gauge groups are glued to different points on the steel structure, and the stress acquisition and emission module is electrically connected to each strain gauge group to form a stress monitoring system. The strain gauge groups include temperature compensation strain gauges and working strain gauges for acquiring stress and strain values. Each compensation strain gauge and working strain gauge is coated with waterproof curing adhesive. Each temperature compensation strain gauge and working strain gauge is covered with a protective cover. This stress detection device can effectively solve the stress monitoring problem of large underwater rotating steel structures and achieve tracking monitoring during equipment operation.

[0004] The aforementioned steel structure stress testing device requires the testing device to be installed at the testing position so that the strain gauge can detect the stress of the steel structure. However, the testing device can only be fixedly installed at one fixed position on the steel structure. When testing other positions is required, the installation position needs to be manually changed, and underwater operation is inconvenient. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an underwater steel structure stress detection device and method to solve the problem that existing steel structure stress detection devices can only be installed in a fixed position and can only detect a fixed position.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] An underwater steel structure stress testing device includes a mounting base, with clamping mechanisms connected to both sides of the mounting base. The two clamping mechanisms are symmetrically arranged with respect to the vertical center plane of the mounting base, and together with the mounting base, they clamp the main body of the steel structure.

[0008] The inner side of the mounting base is provided with two vertical fixing frames, and two rotating shafts are provided between the two fixing frames. The two rotating shafts are arranged vertically, and the ends of the rotating shafts are rotatably connected to the fixing frames. The rotating shafts are perpendicular to the length direction of the main steel structure. Each fixing frame is provided with a first driving component that drives the rotating shaft to rotate. Several coaxial moving wheels are fixedly provided on each rotating shaft.

[0009] The outer side of the mounting base is provided with a control mechanism and two telescopic mechanisms. Both the control mechanism and the telescopic mechanisms are located inside the mounting shell, which is fixedly mounted on the mounting base. The telescopic ends of the two telescopic mechanisms pass through the mounting base, and strain gauges are provided on the end faces of the telescopic ends of the telescopic mechanisms. A stress detector is provided in the control mechanism, and the strain gauges and the stress detector are electrically connected.

[0010] The control mechanism is electrically connected to the first drive assembly, the telescopic mechanism, and the clamping mechanism.

[0011] During stress testing, the strain gauges, moving wheels, and clamping mechanisms are all in contact with the outer side wall of the main steel structure.

[0012] A further improvement of the present invention is that:

[0013] Preferably, the clamping mechanism includes an installation tube, a sliding tube, a second drive assembly, and a clamping plate;

[0014] Each side of the mounting base is connected to a mounting tube, which is perpendicular to the mounting base. The inner circumferential surface of each mounting tube is slidably connected to the outer circumferential surface of a sliding tube. The sliding tube is driven by a lead screw and slider mechanism. The end of the lead screw and slider mechanism is connected to a second drive assembly, which is mounted on the mounting base.

[0015] The sliding tube can slide out of the outer end face of the mounting tube, and the outer end of the sliding tube is rotatably connected to the clamp.

[0016] Preferably, the second drive assembly is disposed on the outer side wall of the mounting base, the lead screw and slider mechanism includes a lead screw and a slider, and a fixing plate is disposed at the inner end of the sliding tube;

[0017] The lead screw passes through the fixed plate and the mounting base. The lead screw is rotatably connected to the fixed plate and the mounting base. The lead screw passes through the end of the mounting base and is connected to the second drive assembly for transmission.

[0018] The slider and lead screw are connected in a sliding manner away from the slider and sliding tube.

[0019] Preferably, the second drive component is disposed in a protective housing, which is mounted on a mounting base.

[0020] Preferably, the outer end of the mounting tube is provided with a sealing part, which presses against the outer circumferential surface of the sliding tube.

[0021] Preferably, the upper end face of the outer end of the sliding tube and the clamping plate are provided with positioning holes, and the limiting bolts are inserted into the two positioning holes, and the limiting bolts and the two positioning holes are threadedly connected.

[0022] Preferably, the clamping plate is provided with a plurality of rollers, the outer surface of the rollers protruding from the clamping plate, and the axis of the rollers being perpendicular to the length direction of the main steel structure.

[0023] Preferably, the mounting housing has a flange on its periphery, and the flange is threadedly connected to the mounting base by a plurality of mounting bolts; a sealing ring is provided between the flange and the mounting housing.

[0024] A stress testing method for any of the above-mentioned steel structure stress testing equipment includes the following steps:

[0025] S1, Install the stress testing equipment on the main steel structure, and clamp the clamping mechanism to the surface of the main steel structure;

[0026] S2, the control mechanism controls the first drive component to start, which drives the two rotating shafts to rotate, the rotating shafts drive the moving wheels to rotate, and the moving wheels drive the detection equipment to move on the steel structure body;

[0027] S3, the detection equipment moves to the set position, the control mechanism controls the telescopic mechanism to press the strain gauges onto the surface of the steel structure, and the stress monitoring instrument measures the stress of the steel structure.

[0028] S4, After the measurement is completed, the control mechanism controls the telescopic mechanism to retract, while simultaneously moving the strain gauge away from the main steel structure.

[0029] S5. Repeat steps S2 to S4 until all measurements at the set positions are completed.

[0030] Preferably, in S1, during the process of the clamping mechanism tightening the surface of the steel structure body, the clamping plate rotates toward the steel structure body, and the limiting bolts position the sliding tube and the clamping plate; the second drive assembly drives the clamping plate to clamp the steel structure body, and the rollers on the clamping plate press against the surface of the steel structure body.

[0031] When the detection equipment in S2 moves, the rollers rotate.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] This invention discloses an underwater steel structure stress testing device. The device, through the arrangement of a mounting base and a clamping mechanism, allows the entire testing equipment to surround the main steel structure. A telescopic mechanism is installed inside the mounting base, allowing the strain gauges to be pushed onto the surface of the steel structure after the device reaches the target position for stress testing. After testing one location, the device drives a rotating shaft and a moving wheel via a first drive component. The moving wheel and rollers in the clamping mechanism press against the surface of the steel structure. As the moving wheel rotates, the testing device can move along the steel structure to test the stress at the next location. This movement method facilitates the installation and disassembly of the testing device. The entire device is autonomously movable, allowing it to be installed on the water and moved to the underwater testing location. The stress testing position can also be adjusted, making it more convenient and flexible to use.

[0034] Furthermore, the clamping mechanism includes a mounting base and a sliding tube. The sliding tube can move along the length of the mounting base under the action of the lead screw and slider, so that the clamping mechanism can clamp the main body of the steel structure. The outer end of the sliding tube is rotatably connected to a clamping plate for clamping the steel structure.

[0035] Furthermore, the second drive assembly is mounted on the mounting base and drives the lead screw and slider mechanism to rotate. The rotation of the lead screw and slider mechanism causes the mounting base to move relative to the mounting tube, which in turn drives the sliding tube to move relative to the mounting tube.

[0036] Furthermore, the second drive assembly is protected by a protective shell, enabling the entire device to operate underwater.

[0037] Furthermore, a sealing part is provided at the outer end of the mounting tube to enhance the sealing between the mounting tube and the sliding tube.

[0038] Furthermore, several rollers are installed on the clamping plate. When the entire testing device moves, the rollers rotate, reducing the friction between the testing device and the main steel structure.

[0039] Furthermore, the periphery of the mounting housing is sealed to enhance the seal between the mounting housing and the entire mounting base, protecting the device inside the mounting housing. Attached Figure Description

[0040] Figure 1 This is a perspective view of an embodiment of the present invention in use.

[0041] Figure 2 This is a schematic diagram of the underwater steel structure stress detection device proposed in this invention.

[0042] Figure 3 This is a schematic diagram of the clamping mechanism in an underwater steel structure stress detection device proposed in this invention.

[0043] Figure 4 This is a schematic diagram of the internal structure of the mounting shell in an underwater steel structure stress detection device proposed in this invention.

[0044] Reference numerals: 1. Mounting shell; 2. Mounting base; 3. Mounting tube; 4. Sliding tube; 5. Rotating shaft; 6. Moving wheel; 7. Fixing frame; 8. Clamping plate; 9. Limiting bolt; 10. Strain gauge; 11. Roller; 12. Lead screw; 13. Positioning hole; 14. Flange; 15. Mounting bolt; 16. Protective shell; 17. Second drive assembly; 18. Fixing plate; 19. Slider; 20. Telescopic mechanism; 21. First drive assembly; 22. Control mechanism; 23. Steel structure main body; 24. Sealing part. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings:

[0046] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] The present invention discloses an underwater steel structure stress detection device. When in use, the device is partially surrounded by the steel structure body 23. The side of the device surrounding the steel structure body 23 is defined as the inner side, and the side away from the steel structure body 23 is defined as the outer side.

[0048] Example 1

[0049] like Figure 1-4 As shown, the underwater steel structure stress detection device proposed in this invention includes a mounting shell 1, a mounting base 2, a rotating shaft 5, a moving wheel 6, a fixed frame 7, and a telescopic mechanism 20.

[0050] Mounting base 2 is a plate-shaped structure. A clamping mechanism is fixedly connected to each end of the inner side. The two clamping mechanisms are mirror-symmetrical with respect to the vertical center plane of mounting base 2. The clamping mechanisms together surround three sides of the entire steel structure body 23, and the other side is partially surrounded. The clamping mechanisms and mounting base 2 work together to move the entire testing equipment to the target position of the steel structure body 23 being tested, and then fix it in the corresponding position.

[0051] Two mounting brackets 7 are provided, and the two mounting brackets 7 are connected to the inner surface of the mounting base 2. The two mounting brackets 7 are mirror-symmetrical with respect to the vertical center plane of the mounting base 2. The two mounting brackets 7 are connected by two vertically arranged rotating shafts 5, and the rotating shafts 5 are rotatably connected to the mounting brackets 7. The axes of the two rotating shafts 5 are set on the same vertical plane. Each rotating shaft 5 is provided with two movable wheels 6, which are coaxially distributed with respect to the rotating shaft 5. The two movable wheels 6 on one rotating shaft 5 are mirror-symmetrical with respect to the vertical center plane of the mounting base 5.

[0052] The fixed frame 7 is provided with a first drive assembly 21 for driving the two rotating shafts 5 to rotate, so that the rotating shafts 5 can rotate, thereby driving the fixed frame 7, the mounting base 2 and the clamping mechanism to move along the length direction of the steel structure body 23.

[0053] The mounting shell 1 connects to the surface of the mounting base 2 furthest from the clamping mechanism, i.e., the inner surface of the mounting base 2. The mounting shell 1 contains a control mechanism 22, which is equipped with a stress detector for detecting stress changes in the main steel structure 23. Two telescopic mechanisms 20 are provided, passing through the mounting base 2. The fixed end of each telescopic mechanism 20 is located inside the mounting shell 1, while the telescopic end is on one side of the inner surface of the mounting base 2. The stress detector is equipped with two strain gauges 10, each located on the inner end of the telescopic end. The strain gauges 10 are connected to the control mechanism 22 via signal lines, receiving control commands from the control mechanism 22 and transmitting stress test results to it simultaneously.

[0054] The control mechanism 22 controls the connection clamping mechanism, the telescopic mechanism 20 and the first drive assembly 21, and is used to drive the clamping mechanism to perform clamping, and the telescopic end of the telescopic mechanism 20 to extend and retract, and is also used to rotate the first drive assembly 21.

[0055] As a preferred method, see Figure 4In this embodiment, the first drive assembly 21 is disposed in a cavity opened inside the fixed frame 7. The first drive assembly 21 includes a first driving wheel, a first driven wheel, two support columns, a rotating belt, and a first drive motor. The two support columns are arranged vertically and are rotatably connected to the side wall of the fixed frame 7. The two support columns are an upper support column and a lower support column, respectively. The rotating belt is fitted onto the upper and lower support columns. The two upper support columns are respectively connected to both ends of the upper rotating shaft 5, and the two lower support columns are respectively connected to both ends of the lower rotating shaft 5. The first drive motor is connected to a control mechanism 22. The control mechanism 22 supplies power to the first drive motor and provides rotation and stop commands. The power output end of the first drive motor is connected to the driving wheel, and the driving wheel meshes with the driven wheel. The shaft of the driven wheel is fixedly connected to the lower support column, which drives the support column to rotate relative to the fixed frame 7. At the same time, the lower support column drives the rotating belt to rotate, which in turn drives the upper support column, thereby causing the upper and lower rotating shafts 5 to rotate synchronously. The control mechanism 22 can simultaneously send rotation signals to the two first drive motors.

[0056] The working process of this embodiment is as follows:

[0057] The control mechanism 22 controls the first drive assembly 21. The first drive assembly 21 starts and drives the two rotating shafts 5 and the moving wheels 6 to rotate. The moving wheels 6 drive the detection equipment to move on the steel structure body 23. When the detection equipment moves to a suitable position, the telescopic mechanism 20 starts and presses the strain gauge 10 against the surface of the steel structure body 23. The stress detector can detect the stress of the steel structure body 23. The detection data is recorded and monitored in real time by the stress detector. The end of the telescopic mechanism 20 presses against the surface of the steel structure body 23 to fix the position of the equipment and prevent the detection equipment from sliding on the steel structure body 23. When it is necessary to move the detection position, the telescopic mechanism 20 simultaneously drives the strain gauge 10 away from the steel structure body 23. The first drive assembly 21 starts and drives the rotating shafts 5 and the moving wheels 6 to rotate. After reaching the set position, the moving wheels 6 press against the surface of the steel structure, fixing the device on the steel structure. When the first drive assembly rotates in the opposite direction, the rotating shafts 5 and the moving wheels 6 also rotate in the opposite direction. The first drive assembly controls the device to move and stop on the steel structure. As the testing equipment moves to different positions, the control mechanism 22 again controls the telescopic mechanism 20 and the stress detector to perform stress testing on different positions of the main steel structure 23.

[0058] Example 2

[0059] like Figure 2 and Figure 4 As shown, the underwater steel structure stress detection device proposed in this invention, compared with Embodiment 1, has a clamping mechanism that includes an installation tube 3, a sliding tube 4, a clamping plate 8, a lead screw 12, a protective shell 16, and a fixing plate 18.

[0060] A mounting tube 3 is connected to each end of the mounting base 2. The mounting tube 3 is connected to the end of the mounting base 2 near the fixing frame 7, and the mounting tube 3 is located on the outside of the fixing frame 7 on the same side. The interior of the mounting tube 3 has a cavity for placing the sliding tube 4. The inner end of the mounting tube 3 is connected to the mounting base 2, and the sliding tube 4 is inserted into the outer end face of the mounting tube 3. The outer circumferential surface of the sliding tube 4 is slidably connected to the inner circumferential surface of the mounting tube 3. The inner end of the sliding tube 4 is a fixing plate 18, which is inserted into the mounting tube 3. The outer end face is rotatably connected to a clamping plate 8. Specifically, the sliding tube 4 is slidably connected to the mounting tube 3 through the second drive assembly 17, the lead screw 12, and the slider 19.

[0061] A protective shell 16 is provided on the outer side of the mounting base 2. The second drive assembly 17 is disposed inside the protective shell 16. The second drive assembly 17 includes a second drive motor, a second driving wheel, and a second driven wheel. The power output end of the second drive motor is connected to the second driving wheel, and the second driving wheel and the second driven wheel mesh. The lead screw 12 is located inside the mounting tube 3, with one end passing through the mounting base 2. The lead screw 12 and the mounting base 12 are rotatably connected. The end of the lead screw 12 passing through the mounting base 2 and the end of the second driven wheel are connected for transmission. The lead screw 12 also passes through the fixing plate 18 and is threadedly connected to the fixing plate 18. A slider 19 is rotatably provided at the end of the lead screw 12 away from the mounting base 2. The slider 19 is slidably connected to the inner circumferential surface of the sliding tube 4. If a track or other device is provided to slidably connect the slider 19 to the sliding tube 4, the sliding tube 4 can move relative to the slider 19 when it moves under the drive of the fixing plate 18, while providing lateral support force to the slider 19 so that the slider 19 can stabilize the lead screw 12.

[0062] A clamping plate 8 is rotatably connected to the end of the sliding tube 4 away from the mounting base 2. Specifically, the clamping plate 8 is provided with a rotating shaft, and a through hole is opened on the end of the sliding tube 4 away from the mounting base 2. The rotating shaft is inserted into the through hole, and the clamping plate 8 and the sliding tube 4 can be rotatably connected. Under the action of external force, the clamping plate 8 can rotate relative to the sliding tube 4. Multiple rollers 11 are rotatably provided on the side of the clamping plate 8 facing the steel structure body 23. The rollers 11 protrude from the side of the clamping plate 8 and press against the surface of the steel structure body 23. The axes of all rollers 11 are perpendicular to the length direction of the steel structure body 23. Two positioning holes 13 are provided on the end of the sliding tube 4 away from the mounting base 2, and corresponding positioning holes 13 are also provided on the clamping plate 8. Limiting bolts 9 are inserted into the positioning holes on the mounting base 2 and the positioning holes on the clamping plate 8, and the limiting bolts 9 are threadedly connected to the two positioning holes 13.

[0063] Furthermore, a sealing part 24 is provided at the end of the mounting tube 3 away from the mounting base 2, and the sealing part 24 is pressed against the outer peripheral surface of the sliding tube 4.

[0064] In this embodiment, the device is first installed on the steel structure body 23, and the two clamping mechanisms are placed on both sides of the steel structure body 23. The clamping plates 8 in the two clamping mechanisms are rotated so that the clamping plates 8 rotate closer to the steel structure body 23. The limiting bolts 9 on the clamping plates 8 are threadedly connected to the positioning holes on the sliding tube 4 to fix the position of the clamping plates 8. The second drive assembly 17 is started to drive the lead screw 12 to rotate. The fixing plate 18 is threadedly connected to the lead screw 12. The fixing plate 18 drives the sliding tube 4 to move along the axis of the lead screw 12. The rollers 11 on the clamping plates 8 in the clamping mechanism are pressed against the surface of the steel structure body 23. The sliding tube 4 drives the clamping plates 8 to gradually approach the steel structure body 23 and clamp the steel structure body 23.

[0065] Example 3

[0066] like Figure 1 and Figures 3-4 As shown, the underwater steel structure stress detection device proposed in this invention, compared with the first embodiment, has a flange 14 at one end of the mounting shell 1 near the mounting base 2, and a plurality of mounting bolts 15 on the flange 14, which are threadedly connected to the surface of the mounting base 2.

[0067] Furthermore, a sealing ring is provided at one end of the flange 14 near the mounting base 2, and the sealing ring is pressed against the surface of the mounting base 2.

[0068] In this embodiment, the flange 14 is provided with a plurality of mounting bolts 15, which are threadedly connected to the mounting base 2. One end of the mounting bolt 15 is pressed against the surface of the flange 14. The flange 14 is provided with a sealing ring. The flange 14 is pressed against the surface of the mounting base 2 to prevent water from seeping into the interior of the mounting shell 1. The mounting shell 1 is easy to install.

[0069] Example 4

[0070] This invention also proposes a method for underwater steel structure stress detection, using the steel structure stress detection equipment in any one of the embodiments 1 to 3, specifically including the following steps:

[0071] S1. First, the device is installed on the steel structure body 23. The outer peripheral surfaces of the two clamping mechanisms and multiple moving wheels 6 on the mounting base 2 are clamped to the surface of the steel structure body 23. The second drive assembly 17 drives the rollers 11 on the clamping plate 8 in the clamping mechanism to press against the surface of the steel structure body 23.

[0072] S2. The control mechanism 22 inside the housing 1 controls the first drive assembly 21 to start and drive the two rotating shafts 5 to rotate. The two rotating shafts 5 drive the moving wheels 6 on them to rotate. The moving wheels 6 drive the detection equipment to move on the steel structure body 23. At the same time, the rollers 11 also rotate.

[0073] S3. When the testing equipment is moved to a suitable position, the control mechanism 22 controls the telescopic mechanism 20 to start pressing the strain gauge 10 against the surface of the steel structure body 23. The stress detector can detect the stress of the steel structure body 23. The test data is recorded and detected in real time by the stress detector. The end of the telescopic mechanism 20 presses against the surface of the steel structure body 23 to fix the position of the equipment and prevent the testing equipment from sliding on the steel structure body 23.

[0074] S4. When it is necessary to move the detection position, the control mechanism 22 controls the two telescopic mechanisms 20 to simultaneously drive the strain gauge 10 away from the main steel structure 23.

[0075] S5. Control mechanism 22 controls the first drive assembly 21 to start and drive the rotating shaft 5 and the moving wheel 6 to rotate, further driving the device to move along the length of the steel structure body 23.

[0076] S6. The testing equipment moves to different positions, and the control mechanism 22 controls the telescopic mechanism 20 and the stress detector to perform stress testing on different positions of the steel structure main body 23.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An underwater steel structure stress detection device, characterized in that, Includes a mounting base (2), on both sides of which are connected clamping mechanisms. The two clamping mechanisms are symmetrically arranged relative to the vertical center of the mounting base (2), and the two clamping mechanisms and the mounting base (2) together clamp the main body of the steel structure (23). The inner side of the mounting base (2) is provided with two vertical fixing frames (7), and two rotating shafts (5) are provided between the two fixing frames (7). The two rotating shafts (5) are arranged vertically, and the ends of the rotating shafts (5) are rotatably connected to the fixing frames (7). The rotating shafts (5) are perpendicular to the length direction of the main steel structure (23). Each fixing frame (7) is provided with a first driving component (21) for driving the rotating shafts (5) to rotate. Several coaxial moving wheels (6) are fixedly provided on each rotating shaft (5). The outer side of the mounting base (2) is provided with a control mechanism (22) and two telescopic mechanisms (20). The control mechanism (22) and the telescopic mechanisms (20) are both located inside the mounting shell (1), which is fixedly mounted on the mounting base (2). The telescopic ends of the two telescopic mechanisms (20) pass through the mounting base (2). Strain gauges (10) are provided on the end faces of the telescopic ends of the telescopic mechanisms (20). A stress detector is provided in the control mechanism (22), and the strain gauges (10) and the stress detector are electrically connected. The control mechanism (22) is simultaneously electrically connected to the first drive assembly, the telescopic mechanism (20), and the clamping mechanism; During stress testing, the strain gauge (10), the moving wheel (6) and the clamping mechanism are all in contact with the outer wall of the main steel structure (23); The clamping mechanism includes an installation tube (3), a sliding tube (4), a second drive assembly, and a clamping plate (8); Each side of the mounting base (2) is connected to a mounting tube (3), and the mounting tube (3) is perpendicular to the mounting base (2); the inner circumferential surface of each mounting tube (3) is slidably connected to the outer circumferential surface of a sliding tube (4), and the sliding tube (4) is driven by a screw-slider mechanism. The end of the screw-slider mechanism is connected to the second drive assembly, and the second drive assembly is set on the mounting base (2). The sliding tube (4) can slide out of the outer end face of the mounting tube (3), and the outer end of the sliding tube (4) is rotatably connected to the clamp (8); Positioning holes (13) are provided on the upper end face of the outer end of the sliding tube (4) and on the clamping plate (8), and the limiting bolt (9) is inserted into the two positioning holes (13); The clamp (8) is provided with several rollers (11).

2. The underwater steel structure stress detection equipment according to claim 1, characterized in that, The second drive assembly is disposed on the outer side wall of the mounting base (2), the lead screw and slider mechanism includes a lead screw (12) and a slider (19), and a fixing plate (18) is disposed at the inner end of the sliding tube (4). The lead screw (12) passes through the fixed plate (18) and the mounting base (2). The lead screw (12) is rotatably connected to the fixed plate (18) and rotatably connected to the mounting base (2). The lead screw (12) passes through the end of the mounting base (2) and is connected to the second drive assembly.

3. The underwater steel structure stress detection equipment according to claim 1, characterized in that, The second drive component is disposed in a protective housing (16), which is mounted on a mounting base (2).

4. The underwater steel structure stress detection equipment according to claim 1, characterized in that, The outer end of the mounting tube (3) is provided with a sealing part (24), which presses against the outer circumferential surface of the sliding tube (4).

5. The underwater steel structure stress detection equipment according to claim 1, characterized in that, The limiting bolt (9) and the two positioning holes (13) are threaded together.

6. The underwater steel structure stress detection equipment according to claim 1, characterized in that, The outer surface of the roller (11) protrudes from the clamping plate (8), and the axis of the roller (11) is perpendicular to the length direction of the main steel structure (23).

7. The underwater steel structure stress detection equipment according to claim 1, characterized in that, The mounting shell (1) is provided with a flange (14) on its periphery. The flange (14) is threadedly connected to the mounting base (2) by a number of mounting bolts (15). A sealing ring is provided between the flange (14) and the mounting shell (1).

8. A stress detection method using the underwater steel structure stress detection equipment according to any one of claims 1-7, characterized in that, Includes the following steps: S1, install the stress detection equipment on the main body of the steel structure (23), and clamp the clamping mechanism to clamp the surface of the main body of the steel structure (23); S2, the control mechanism (22) controls the first drive component (21) to start, driving the two rotating shafts (5) to rotate, the rotating shafts (5) drive the moving wheels (6) to rotate, and the moving wheels (6) drive the detection equipment to move on the steel structure body (23); S3, the detection equipment moves to the set position, the control mechanism controls the telescopic mechanism (20) to press the strain gauge (10) onto the surface of the steel structure body (23), and the stress monitoring instrument measures the stress of the steel structure body (23); S4. After the measurement is completed, the control mechanism (22) controls the telescopic mechanism (20) to contract, and at the same time drives the strain gauge (10) away from the main steel structure (23). S5. Repeat steps S2 to S4 until all measurements at the set positions are completed.

9. The stress detection method according to claim 8, characterized in that, In S1, during the process of clamping the steel structure body (23) surface, the clamping plate (8) rotates toward the steel structure body (23), and the limiting bolt (9) positions the sliding tube (4) and the clamping plate (8); the second drive assembly (17) drives the clamping plate (8) to clamp the steel structure body (23), and the roller (11) on the clamping plate (8) presses against the surface of the steel structure body (23); When the detection device moves in S2, the roller (11) rotates.

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