Prestressed duct grouting quality detection device

Abstract

The invention relates to the field of duct grouting detection, in particular to a prestressed duct grouting quality detection device which comprises a movable rack arranged on one side of a beam wall in the length direction of a grouting duct; a driving part for driving the supporting frame to advance in the length direction of the grouting hole channel is arranged in the movable rack, and a cavity shell horizontally advancing in the direction perpendicular to the grouting hole channel is arranged in the supporting frame; the lifting frame is mounted in the supporting frame in an up-down moving manner; the detection sleeve and the excitation frame are symmetrically arranged at the two ends of the top of the lifting frame. According to the device, the knocking distance can be adjusted according to actual detection requirements, point-by-point equidistant detection can be carried out on the grouting hole channel, the detection efficiency is greatly improved, meanwhile, the consistency of knocking force every time can be ensured by controlling the excitation hammer to keep the same height, and the accuracy of knocking detection can be improved.

Description

Technical Field

[0001] This invention relates to the field of grouting inspection technology, and in particular to a device for inspecting the quality of prestressed grouting. Background Technology

[0002] Prestressed concrete bridges are widely used in highway bridge construction due to their high load-bearing capacity and high stiffness. The quality of prestressed duct grouting is a key part of the bridge prestressing system and directly affects the service life and structural safety of the prestressed beam.

[0003] Key factors affecting the quality of prestressed grouting include grout fluidity, grout expansion rate, grout density, and grout bond strength. Among these, grout density is the most critical indicator determining grouting quality. The most widely used method for detecting grout density is the impact-echo method. This method generates low-frequency stress waves through mechanical impact, which propagate and reflect on the concrete surface. Analyzing the wave velocity, waveform, and dominant frequency changes of the reflected waves helps locate grouting defects.

[0004] Currently, in the process of locating and testing the tightness of prestressed duct grouting, workers need to first press a handheld probe firmly against the surface to be tested on the side wall of the bridge, and then gently tap the beam wall with a small steel hammer to induce a momentary low-frequency stress wave for testing. For example... Figure 1 As shown, the striking distance L1 between the striking point and the detection point needs to be adjusted according to the beam wall thickness for each strike, while the detection distance L2 between adjacent detection points needs to be adjusted according to the beam wall length for each test. Therefore, during the test, workers need to calculate and mark the detection points on the beam wall in advance, then visually judge the striking points based on experience, and then strike and test each point along the beam wall. This process relies heavily on the worker's operating experience, resulting in low testing efficiency and the need to improve testing accuracy. Summary of the Invention

[0005] The purpose of this invention is to provide a device for detecting the quality of prestressed duct grouting, thereby solving the aforementioned technical problems.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A device for detecting the quality of prestressed duct grouting, comprising:

[0008] A movable platform is provided on one side of the beam wall along the length of the grouting duct;

[0009] The support frame is provided with a driving component inside the movable platform for driving the support frame to move along the length direction of the grouting channel, and a cavity shell inside the support frame is provided to move horizontally and perpendicularly to the direction of the grouting channel.

[0010] A lifting frame, which is vertically and movably installed inside a support frame;

[0011] The detection sleeve and the excitation frame are symmetrically installed at both ends of the top of the lifting frame. The detection sleeve has a detection head fixed at the front end, and the excitation frame has an excitation guide cone fixed inside. The detection head and the excitation guide cone are on the same horizontal plane and their ends are flush.

[0012] The lifting frame is equipped with an adjustment component to adjust the distance between the detection head and the excitation guide cone, and the excitation frame is equipped with an excitation component to adjust the hammering force applied to the excitation guide cone.

[0013] The instrument body is equipped with a detection head connected to the instrument body via a wire to transmit detection signals.

[0014] As a further embodiment of the present invention: the driving component includes a guide rod, a linear screw, and a servo motor. The guide rod and the linear screw are both parallel to the grouting channel. The guide rod is fixed inside the movable platform and slides through the bottom of the support frame. The linear screw is rotated inside the movable platform and threaded through the bottom of the support frame. The servo motor is fixed on the side wall of the movable platform, and the output end of the servo motor is connected to the linear screw.

[0015] As a further embodiment of the present invention: extension plates are provided on both sides of the cavity shell, and a height adjustment cylinder is fixedly provided on one side of the extension plate. The output end of the height adjustment cylinder is fixedly connected to one end of the lifting frame, and a limit rod is fixedly provided at the bottom of the other end of the lifting frame. The limit rod slides through the extension plate on the other side.

[0016] As a further embodiment of the present invention: a sliding rod is fixedly provided inside the support frame, the sliding rod is perpendicular to the grouting channel, the bottom of the cavity shell is slidably installed on the sliding rod, a compression spring is provided between one side of the cavity shell and the support frame, an electric lifter is fixedly provided inside the support frame, the output end of the electric lifter is connected to a lifting rod, a fixed support is fixedly sleeved on the lifting rod, the fixed support is rotatably engaged with one end of the support rod, and the other end of the support rod is rotatably engaged with the side wall of the cavity shell.

[0017] As a further embodiment of the present invention: an air cylinder is fixedly mounted on the side wall of the support frame, a piston is fixedly mounted on the top of the lifting rod, the piston is adapted to be slidably installed in the inner cavity of the air cylinder, a bracket is fixedly mounted in the center of the lifting frame, a fixed air pipe is fixedly mounted on the top of the bracket, the fixed air pipe is on the same horizontal plane as the detection sleeve and the excitation guide cone, the tail end of the fixed air pipe is connected to the air cylinder through a hose, and a pair of air nozzles are symmetrically arranged at the head end of the fixed air pipe, the air jet direction of the air nozzles is respectively towards the excitation guide cone and the end of the detection head.

[0018] As a further embodiment of the present invention: the adjusting component includes a lifting screw and an adjusting motor. The lifting screw is rotatably mounted inside the bracket, and the adjusting motor is fixedly mounted at the bottom of the lifting frame. The output end of the adjusting motor is connected to the lifting screw. A lifting seat is threaded through the lifting screw. Connecting rods are symmetrically mounted at both ends of the lifting seat. One connecting rod is rotatably engaged with the bottom of the vibration frame, and the other connecting rod is rotatably engaged with the bottom of the sleeve. The detection sleeve is fixedly mounted inside the sleeve. A smooth rod is fixedly mounted inside the lifting frame. The vibration frame and the sleeve are both slidably mounted on the smooth rod.

[0019] As a further embodiment of the present invention: the excitation component includes a pendulum rod, an excitation hammer, and a winding reel. The pendulum rod and the winding reel are both mounted inside the excitation frame. The excitation hammer is fixed to the bottom end of the pendulum rod. A pull rope is wound inside the winding reel, and one end of the pull rope is fixedly connected to the top end of the pendulum rod.

[0020] As a further aspect of the present invention: a take-up gear is fixedly sleeved at one end of the rotating shaft of the winding reel; an electric telescopic device is fixedly provided on the side wall of the excitation frame; a mounting base is fixedly connected to the output end of the electric telescopic device; a sliding groove is provided on the side wall of the excitation frame; the mounting base is linearly slidably installed in the sliding groove; a clutch gear for meshing with the take-up gear is rotatably installed in the mounting base; a rotary motor is fixedly provided on the side wall of the mounting base; and the output end of the rotary motor is connected to the clutch gear.

[0021] As a further aspect of the present invention: the distance between the tail end of the excitation guide cone and the perpendicular line to the rotation axis of the pendulum is consistent with the radius of the excitation hammer.

[0022] As a further aspect of the present invention: universal casters are provided at the four corners of the bottom of the mobile platform, and a handrail is provided on one side of the mobile platform.

[0023] The beneficial effects of this invention are:

[0024] (1) Before the test, the height of the lifting frame is adjusted up and down so that the test head and the excitation guide cone can be aligned with the axis of the grouting channel. At the same time, the tapping interval can be adjusted according to the actual test requirements using the adjustment component. After one tapping test is completed, the drive component is used to move intermittently at equal intervals along the axis of the channel, driving the test sleeve and the excitation guide cone to move synchronously, so that the grouting channel can be tested point by point at equal intervals, which greatly improves the test efficiency.

[0025] (2) By setting up the excitation component, when preparing to perform excitation test, the clutch gear disengages from the winding gear. At this time, the swing arm will swing under the gravity of the excitation hammer until the excitation hammer strikes the excitation guide cone to realize the striking test process. Each time the striking test is performed, the excitation hammer can be kept at the same height to ensure the consistency of the striking force each time, which is beneficial to improving the accuracy of the striking test. When testing different beam wall ducts, the hammering force can be adjusted by adjusting the height of the excitation hammer, which has a wide range of applications.

[0026] (3) As the detection head and the excitation guide cone gradually approach the beam wall, the electric lifter will push the piston upward, causing the piston to expel the air in the air cylinder. The airflow passes through the hose and the fixed air pipe in sequence, and is sprayed out through the nozzle. Since the nozzle is directed towards the excitation guide cone and the end of the detection head, the airflow can clean the detection point and the excitation point on the beam wall in advance, avoiding the impact of impurities and dirt on the beam wall on the excitation detection process, and further improving the detection accuracy. Attached Figure Description

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the detection point and the excitation point during the detection process.

[0029] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0030] Figure 3 This is a schematic diagram of the support frame in this invention.

[0031] Figure 4 This is a schematic diagram of the hollow shell structure in this invention.

[0032] Figure 5 This is a schematic diagram of the lifting frame in this invention.

[0033] Figure 6 This is a schematic diagram of the connection structure of the fixed trachea in this invention.

[0034] Figure 7 This is a schematic diagram of the structure of the excitation frame in this invention.

[0035] Figure 8 yes Figure 7 Enlarged diagram of point A in the middle.

[0036] Figure 9 This is a schematic diagram of the operation of the vibratory hammer in this invention.

[0037] In the picture:

[0038] 1. Moving platform; 11. Guide rod; 12. Linear screw; 13. Servo motor;

[0039] 2. Support frame; 21. Slide rod; 22. Compression spring; 23. Electric lifter; 231. Lifting rod; 232. Fixed support; 233. Piston; 24. Support rod; 25. Air cylinder; 26. Hose; 27. Fixed air pipe; 271. Air nozzle;

[0040] 3. Hollow housing; 31. Extension plate; 32. Height adjustment cylinder;

[0041] 4. Lifting frame; 41. Bracket; 42. Lifting screw; 421. Lifting seat; 422. Connecting rod; 43. Adjusting motor; 44. Smooth rod; 45. Sleeve; 46. Limiting rod;

[0042] 5. Testing sleeve; 51. Testing head; 52. Wire;

[0043] 6. Vibration frame; 61. Swing rod; 62. Vibration hammer; 63. Winding reel; 631. Pull rope; 632. Rewinding gear; 64. Electric expansion joint; 641. Mounting base; 642. Rotary motor; 643. Clutch gear; 65. Sliding groove;

[0044] 7. Excitation guide cone;

[0045] 8. Main body of the instrument. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] A device for detecting the quality of prestressed duct grouting, comprising:

[0048] The movable platform 1 is set on one side of the beam wall along the length of the grouting channel.

[0049] The phrase "movable platform 1 is set along the length of the grouting duct" should be understood as meaning that the movable platform 1 itself has a certain length, and the length of the movable platform 1 should be parallel to the direction of the grouting duct. In actual testing, the length of the bridge beam wall is greater than the length of the movable platform 1. Therefore, during testing, the movable platform 1 can be moved along the length of the beam wall according to actual testing needs, thereby realizing the testing process of the entire grouting duct inside the beam wall.

[0050] The support frame 2 and the movable platform 1 are provided with a driving component that drives the support frame 2 to move along the length of the grouting channel. The support frame 2 is provided with a cavity shell 3 that moves horizontally and perpendicularly to the grouting channel.

[0051] The lifting frame 4 is installed inside the support frame 2, and can move up and down.

[0052] The detection sleeve 5 and the excitation frame 6 are symmetrically installed at both ends of the top of the lifting frame 4. The front end of the detection sleeve 5 is fixed with a detection head 51, and the excitation guide cone 7 is fixed inside the excitation frame 6. The detection head 51 and the excitation guide cone 7 are on the same horizontal plane and their ends are flush.

[0053] Specifically, the support frame 2 can intermittently travel at equal intervals along the length of the grouting channel via a drive component, thereby driving the detection sleeve 5 and the excitation guide cone 7 to move synchronously, thus enabling equal-interval detection of the grouting channel. It should be noted that before detection, the height of the lifting frame 4 needs to be adjusted vertically so that the detection head 51 and the excitation guide cone 7 are aligned with the axis of the grouting channel. During detection, since the ends of the detection head 51 and the excitation guide cone 7 are aligned, the cavity shell 3 is controlled to move towards the beam wall, and the detection head 51 and the excitation guide cone 7 will simultaneously contact and adhere to the beam wall, ensuring a smooth detection process.

[0054] The lifting frame 4 is equipped with an adjustment component to adjust the distance between the detection head 51 and the excitation guide cone 7, and the excitation frame 6 is equipped with an excitation component to adjust the hammering force applied to the excitation guide cone 7.

[0055] The instrument body 8 and the detection head 51 are connected to the instrument body 8 via wires 52 to achieve detection signal transmission.

[0056] Specifically, when performing a positioning test on the grouting tightness of the beam wall ducts, the striking distance L1 between the striking point and the test point should be adjusted accordingly because the wall thickness of different beam walls varies. The distance between the test head 51 and the excitation guide cone 7 is adjusted using an adjusting component. It is important to note that the striking distance needs to be determined and adjusted in advance based on the beam wall thickness before testing. When the support frame 2 moves equidistantly along the grouting duct, the positions of the test head 51 and the excitation guide cone 7 remain fixed. That is, for the testing of grouting ducts on the same beam wall, the striking distance is fixed during the testing process. This maintains the consistency of the striking distance throughout the testing process, resulting in higher testing accuracy compared to manual judgment based on operational experience, and thus improving the testing effect.

[0057] More specifically, the excitation component can adjust the hammering force on the excitation guide cone 7. Compared with the manual hammering process, it can ensure that the hammering force is consistent each time, which is conducive to improving the accuracy of the test. At the same time, when testing different beam wall ducts, the hammering force can be flexibly adjusted as needed, making it widely applicable.

[0058] like Figure 2 As shown, the driving component includes a guide rod 11, a linear screw 12, and a servo motor 13. The guide rod 11 and the linear screw 12 are both parallel to the grouting channel. The guide rod 11 is fixed inside the movable platform 1 and slides through the bottom of the support frame 2. The linear screw 12 is rotated inside the movable platform 1 and threaded through the bottom of the support frame 2. The servo motor 13 is fixed on the side wall of the movable platform 1, and the output end of the servo motor 13 is connected to the linear screw 12.

[0059] Specifically, both the guide rod 11 and the linear screw 12 are set parallel to the grouting channel, which ensures that the movement direction of the support frame 2 is always parallel to the channel axis. The servo motor 13 is started, driving the linear screw 12 to rotate. The linear screw 12 will drive the support frame 2 to move intermittently and equidistantly along the guide rod 11. The distance that the support frame 2 moves each time is the detection interval L2.

[0060] like Figure 4 and Figure 5 As shown, extension plates 31 are provided on both sides of the cavity shell 3. A height adjustment cylinder 32 is fixedly installed on one side of the extension plate 31. The output end of the height adjustment cylinder 32 is fixedly connected to one end of the lifting frame 4. A limit rod 46 is fixedly installed at the bottom of the other end of the lifting frame 4. The limit rod 46 slides through the extension plate 31 on the other side.

[0061] Specifically, the height adjustment cylinder 32 is activated, driving the lifting frame 4 to move up and down synchronously, thereby adjusting the height of the detection head 51 and the excitation guide cone 7 to be consistent with the height of the channel axis. During this process, the limit rod 46 can effectively ensure the stability of the lifting frame 4 during the lifting movement.

[0062] like Figure 3 and Figure 4 As shown, a slide rod 21 is fixed inside the support frame 2. The slide rod 21 is perpendicular to the grouting channel. The bottom of the cavity shell 3 is slidably installed on the slide rod 21. A compression spring 22 is provided between one side of the cavity shell 3 and the support frame 2. An electric lifter 23 is fixed inside the support frame 2. The output end of the electric lifter 23 is connected to a lifting rod 231. A fixed support 232 is fixedly sleeved on the lifting rod 231. The fixed support 232 is rotatably engaged with one end of the support rod 24. The other end of the support rod 24 is rotatably engaged with the side wall of the cavity shell 3.

[0063] Specifically, in the initial state, the detection head 51 and the excitation guide cone 7 are still a certain distance from the beam wall. When preparing for vibration testing, the electric lifter 23 is activated, driving the lifting rod 231 to lift the fixed support 232 upward. The fixed support 232 will push the cavity shell 3 to slide linearly along the slide rod 21 through the support rod 24. The compression spring 22 begins to be compressed and deformed, causing the detection head 51 and the excitation guide cone 7 to gradually move towards the beam wall and eventually press against the beam wall simultaneously. After the vibration test is completed, the electric lifter 23 drives the lifting rod 231 to retract. At this time, the cavity shell 3 slides in the opposite direction under the pull of the support rod 24, and automatically resets with the elastic force of the compression spring 22, so as to facilitate the testing of the next detection point.

[0064] like Figures 3-6 As shown, an air cylinder 25 is fixed on the side wall of the support frame 2, and a piston 233 is fixed at the top of the lifting rod 231. The piston 233 is adapted to slide in the inner cavity of the air cylinder 25. A bracket 41 is fixed in the center of the lifting frame 4, and a fixed air pipe 27 is fixed at the top of the bracket 41. The fixed air pipe 27 is on the same horizontal plane as the detection sleeve 5 and the excitation guide cone 7. The tail end of the fixed air pipe 27 is connected to the air cylinder 25 through a hose 26. A pair of jet nozzles 271 are symmetrically arranged at the head end of the fixed air pipe 27. The jet direction of the jet nozzles 271 is towards the excitation guide cone 7 and the end of the detection head 51, respectively.

[0065] Specifically, as the detection head 51 and the excitation guide cone 7 gradually approach the beam wall, the electric lifter 23 pushes the piston 233 upward, causing the piston 233 to expel air from the air cylinder 25. The airflow passes through the hose 26 and the fixed air pipe 27 in sequence, and is ejected through the nozzle 271. Since the nozzle 271 is directed towards the excitation guide cone 7 and the end of the detection head 51, the ejected airflow can pre-clean the detection points and excitation points on the beam wall, preventing impurities and dirt adhering to the beam wall from affecting the excitation detection process. Simultaneously, the process of the detection head 51 and the excitation guide cone 7 approaching the wall is coordinated with the pushing and blowing process, ensuring that pre-cleaning is performed before each excitation test, and that the system can be synchronously reset and evacuated after the excitation test. The entire transmission process is reliable and stable.

[0066] It should be noted that in this embodiment, the fixed air pipe 27 is fixed on the bracket 41 in the center of the lifting frame 4, so that the fixed air pipe 27 can move up and down synchronously with the lifting frame 4 and always be at the same level as the detection sleeve 5 and the excitation guide cone 7. During this process, the flexible hose 26 has elasticity, which allows the fixed air pipe 27 to maintain good air permeability with the air cylinder 25 during the lifting process.

[0067] like Figure 5As shown, the adjustment components include a lifting screw 42 and an adjustment motor 43. The lifting screw 42 is rotatably mounted inside the bracket 41, and the adjustment motor 43 is fixed to the bottom of the lifting frame 4. The output end of the adjustment motor 43 is connected to the lifting screw 42. A lifting seat 421 is threaded through the lifting screw 42. Connecting rods 422 are symmetrically mounted at both ends of the lifting seat 421. One connecting rod 422 is rotatably engaged with the bottom of the excitation frame 6, and the other connecting rod 422 is rotatably engaged with the bottom of the sleeve 45. The detection sleeve 5 is fixed inside the sleeve 45. A smooth rod 44 is fixed inside the lifting frame 4. The excitation frame 6 and the sleeve 45 are both slidably mounted on the smooth rod 44.

[0068] Specifically, the adjustment motor 43 starts and drives the lifting screw 42 to rotate. The lifting screw 42 will drive the lifting seat 421 to move up and down. The lifting seat 421 drives the excitation frame 6 and the sleeve 45 to slide along the smooth rod 44 through the connecting rod 422, thereby adjusting the distance between the detection head 51 and the excitation guide cone 7, that is, the striking distance L1 can be adjusted according to the actual detection requirements.

[0069] like Figure 7 and Figure 8 As shown, the excitation component includes a swing arm 61, an excitation hammer 62, and a winding reel 63. The swing arm 61 and the winding reel 63 are both mounted inside the excitation frame 6. The excitation hammer 62 is fixed to the bottom end of the swing arm 61. A pull rope 631 is wound inside the winding reel 63, and one end of the pull rope 631 is fixedly connected to the top end of the swing arm 61.

[0070] Furthermore, a take-up gear 632 is fixedly sleeved at one end of the shaft of the winding reel 63, an electric telescopic device 64 is fixedly installed on the side wall of the excitation frame 6, and a mounting base 641 is fixedly connected to the output end of the electric telescopic device 64. A sliding groove 65 is provided on the side wall of the excitation frame 6, and the mounting base 641 is linearly slidably installed in the sliding groove 65. A clutch gear 643 for meshing with the take-up gear 632 is rotatably installed in the mounting base 641. A rotary motor 642 is fixedly installed on the side wall of the mounting base 641, and the output end of the rotary motor 642 is connected to the clutch gear 643.

[0071] Specifically, by setting up an excitation component, when the clutch gear 643 meshes with the take-up gear 632, the rotary motor 642 will drive the winding reel 63 to rotate through gear transmission. At this time, the pull rope 631 will pull the swing arm 61 to swing upward gradually. When preparing to perform excitation testing, the electric telescopic device 64 drives the mounting base 641 to retract. At this time, the clutch gear 643 disengages from the take-up gear 632, and the winding reel 63 will be instantly released from rotational constraint. Simultaneously, the swing arm 61 will swing under the gravity of the excitation hammer 62 until the excitation hammer 62 strikes the excitation guide cone 7 to realize the striking test process. During each striking test, the height of the excitation hammer 62 can be controlled to ensure the consistency of the striking force each time, which is beneficial to improving the accuracy of the striking test. When testing different beam wall ducts, the striking force can be adjusted by adjusting the height of the excitation hammer 62, which has a wide range of applications.

[0072] like Figure 9 As shown, the distance between the tail end of the excitation guide cone 7 and the perpendicular line to the rotation axis of the swing rod 61 (as shown by d in the figure) is consistent with the radius of the excitation hammer 62. This ensures that when the excitation hammer 62 strikes the excitation guide cone 7, the instantaneous striking force direction is always located in the axial direction of the excitation guide cone 7, which is beneficial to improving the excitation effect.

[0073] like Figure 2 As shown, the four corners of the bottom of the mobile platform 1 are provided with universal casters, and a handrail is provided on one side of the mobile platform 1. The operator can hold the handrail and use the universal casters to push the mobile platform 1 to the designated position.

[0074] The working principle of this invention is as follows: Figures 1-9As shown, during use, the movable platform 1 is first moved to one side of the beam wall, and the universal rollers are locked to keep the movable platform 1 stationary. Before the vibration test, the height adjustment cylinder 32 is started, driving the lifting frame 4 to move up and down synchronously, thereby adjusting the height of the test head 51 and the vibration guide cone 7 to be consistent with the height of the channel axis. At the same time, the adjustment motor 43 is started, driving the lifting screw 42 to rotate. The lifting screw 42 will drive the lifting seat 421 to move up and down. The lifting seat 421 drives the vibration frame 6 and the sleeve 45 to slide along the smooth rod 44 through the connecting rod 422, thereby adjusting the distance between the test head 51 and the vibration guide cone 7, that is, the tapping distance L1 can be adjusted according to the actual testing requirements. When preparing for vibration testing, the electric lifter 23 is activated, driving the lifting rod 231 to raise the fixed support 232 upwards. The fixed support 232, through the support rod 24, pushes the cavity shell 3 to slide linearly along the slide rod 21. The compression spring 22 begins to be compressed and deformed, causing the detection head 51 and the vibration guide cone 7 to gradually move towards the beam wall and eventually press against it simultaneously. As the detection head 51 and the vibration guide cone 7 gradually approach the beam wall, the electric lifter 23 pushes the piston 233 upwards, causing the piston 233 to expel air from the air cylinder 25. The airflow passes through the hose 26 and the fixed air pipe 27 in sequence, and is ejected through the nozzle 271. Since the nozzle 271 is directed towards the ends of the vibration guide cone 7 and the detection head 51, the ejected airflow can pre-clean the detection points and vibration points on the beam wall, preventing impurities and dirt adhering to the beam wall from affecting the vibration testing process. When preparing for vibration testing, the electric telescopic device 64 drives the mounting base 641 to retract. At this time, the clutch gear 643 disengages from the winding gear 632, and the winding reel 63 is instantly released from rotational constraint. Simultaneously, the swing arm 61 swings under the gravity of the vibration hammer 62 until the vibration hammer 62 strikes the vibration guide cone 7. The stress wave generated by the vibration is detected by the detection head 51, and the detection signal is transmitted to the instrument body 8 for analysis via the wire 52. After completing one vibration test, the support frame 2 can intermittently travel at equal intervals along the length of the grouting channel via the drive component, thereby driving the detection sleeve 5 and the guide cone to move synchronously, thus enabling point-by-point equal-interval testing of the grouting channel.

[0075] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A device for detecting the quality of grouting in prestressed ducts, characterized in that, include: A movable platform (1) is provided on one side of the beam wall along the length of the grouting duct; The support frame (2) is provided with a driving component inside the movable platform (1) to drive the support frame (2) to move along the length of the grouting channel, and the support frame (2) is provided with a cavity shell (3) that moves horizontally and perpendicularly to the grouting channel. The lifting frame (4) is installed inside the support frame (2) and can move up and down. The detection sleeve (5) and the excitation frame (6) are symmetrically installed at both ends of the top of the lifting frame (4). The detection sleeve (5) has a detection head (51) fixed at the front end, and the excitation frame (6) has an excitation guide cone (7) fixed inside. The detection head (51) and the excitation guide cone (7) are on the same horizontal plane and their ends are flush. The lifting frame (4) is equipped with an adjustment component to adjust the distance between the detection head (51) and the excitation guide cone (7), and the excitation frame (6) is equipped with an excitation component to adjust the hammering force applied to the excitation guide cone (7). The instrument body (8) is connected to the detection head (51) via a wire (52) to achieve detection signal transmission.

2. The prestressed duct grouting quality testing device according to claim 1, characterized in that, The driving component includes a guide rod (11), a linear screw (12), and a servo motor (13). The guide rod (11) and the linear screw (12) are parallel to the grouting channel. The guide rod (11) is fixed inside the movable platform (1) and slides through the bottom of the support frame (2). The linear screw (12) is rotated inside the movable platform (1) and threaded through the bottom of the support frame (2). The servo motor (13) is fixed on the side wall of the movable platform (1). The output end of the servo motor (13) is connected to the linear screw (12).

3. The prestressed duct grouting quality testing device according to claim 1, characterized in that, The cavity shell (3) has extension plates (31) extending on both sides. One of the extension plates (31) is fixedly provided with a height adjustment cylinder (32). The output end of the height adjustment cylinder (32) is fixedly connected to one end of the lifting frame (4). The bottom of the other end of the lifting frame (4) is fixedly provided with a limiting rod (46). The limiting rod (46) slides through the extension plate (31) on the other side.

4. The prestressed duct grouting quality testing device according to claim 1, characterized in that, The support frame (2) is fixedly provided with a slide rod (21), which is perpendicular to the grouting channel. The bottom of the cavity shell (3) is slidably installed on the slide rod (21). A compression spring (22) is provided between one side of the cavity shell (3) and the support frame (2). An electric lifter (23) is fixedly provided inside the support frame (2). The output end of the electric lifter (23) is connected to a lifting rod (231). A fixed support (232) is fixedly sleeved on the lifting rod (231). The fixed support (232) is rotatably engaged with one end of the support rod (24), and the other end of the support rod (24) is rotatably engaged with the side wall of the cavity shell (3).

5. The prestressed duct grouting quality testing device according to claim 4, characterized in that, An air cylinder (25) is fixed on the side wall of the support frame (2), and a piston (233) is fixed at the top of the lifting rod (231). The piston (233) is adapted to slide in the inner cavity of the air cylinder (25). A bracket (41) is fixed in the center of the lifting frame (4), and a fixed air pipe (27) is fixed at the top of the bracket (41). The fixed air pipe (27) is on the same horizontal plane as the detection sleeve (5) and the excitation guide cone (7). The tail end of the fixed air pipe (27) is connected to the air cylinder (25) through a hose (26). A pair of jet nozzles (271) are symmetrically arranged at the head end of the fixed air pipe (27). The jet direction of the jet nozzles (271) is towards the end of the excitation guide cone (7) and the detection head (51), respectively.

6. The prestressed duct grouting quality testing device according to claim 5, characterized in that, The adjusting components include a lifting screw (42) and an adjusting motor (43). The lifting screw (42) is rotatably mounted in the bracket (41), and the adjusting motor (43) is fixedly mounted at the bottom of the lifting frame (4). The output end of the adjusting motor (43) is connected to the lifting screw (42). A lifting seat (421) is threaded through the lifting screw (42). Connecting rods (422) are symmetrically mounted at both ends of the lifting seat (421). One connecting rod (422) is rotatably engaged with the bottom of the excitation frame (6), and the other connecting rod (422) is rotatably engaged with the bottom of the sleeve (45). The detection sleeve (5) is fixedly mounted in the sleeve (45). A smooth rod (44) is fixedly mounted in the lifting frame (4). The excitation frame (6) and the sleeve (45) are both slidably mounted on the smooth rod (44).

7. The prestressed duct grouting quality testing device according to claim 1, characterized in that, The excitation component includes a swing arm (61), an excitation hammer (62), and a winding reel (63). The swing arm (61) and the winding reel (63) are both mounted inside the excitation frame (6). The excitation hammer (62) is fixed at the bottom of the swing arm (61). A pull rope (631) is wound inside the winding reel (63), and one end of the pull rope (631) is fixedly connected to the top of the swing arm (61).

8. The prestressed duct grouting quality testing device according to claim 7, characterized in that, One end of the winding reel (63) is fixedly sleeved with a take-up gear (632). An electric telescopic device (64) is fixedly installed on the side wall of the excitation frame (6). The output end of the electric telescopic device (64) is fixedly connected to a mounting base (641). A sliding groove (65) is provided on the side wall of the excitation frame (6). The mounting base (641) is linearly slidably installed in the sliding groove (65). A clutch gear (643) for meshing with the take-up gear (632) is rotatably installed in the mounting base (641). A rotary motor (642) is fixedly installed on the side wall of the mounting base (641). The output end of the rotary motor (642) is connected to the clutch gear (643).

9. The prestressed duct grouting quality testing device according to claim 7, characterized in that, The distance between the tail end of the excitation guide cone (7) and the perpendicular line to the rotation axis of the pendulum (61) is consistent with the radius of the excitation hammer (62).

10. The prestressed duct grouting quality testing device according to claim 1, characterized in that, The mobile platform (1) is provided with universal casters at the four corners of its bottom end, and a handrail is provided on one side of the mobile platform (1).

Images