A monitoring device for prestressed grouting under the anchor of a concrete box girder

Abstract

This invention relates to the field of concrete box girder monitoring technology and discloses a prestressed grouting monitoring device for concrete box girder anchorages. The device includes a main body and several anchor cables, arranged in multiple groups of four cables each, with the anchor cables arranged at equal intervals. The rotation of the hydraulic actuator occurs on the guide surface of an arc-shaped plate with a semi-circular structure, without affecting the axial transmission of tension force. This allows the multiple arc-shaped plates forming the semi-circular structure to create a guide frame between the hydraulic actuator and the monitoring sensor, maintaining the coaxiality of the hydraulic actuator, anchor cables, and monitoring sensor. This avoids misalignment among the three components, preventing the anchor cables from experiencing bending stress instead of axial tension, ensuring the accuracy of data during anchor cable prestress monitoring, and improving monitoring efficiency.

Description

Technical Field

[0001] This invention relates to the field of concrete box girder monitoring technology, specifically to a monitoring device for prestressed grouting under the anchor of a concrete box girder. Background Technology

[0002] The prestressed grouting monitoring device under the anchorage of concrete box girder is a core testing device in the construction of prestressed concrete bridges. It is mainly used in the construction of post-tensioned concrete box girders and can realize the integrated testing of two core functions: effective prestress monitoring under the anchorage and grouting density monitoring in the ducts. It can accurately control the prestressing tensioning quality and grouting filling effect, and fundamentally ensure the durability, stability and safety of the box girder structure. It is a key piece of equipment for quality control of prestressed construction in highway and railway bridge engineering.

[0003] When monitoring the prestress and grouting of concrete box girders under anchorage, sensors are typically installed on the anchor cables. Then, hydraulic devices are installed on the anchor cables to tension them. The sensors monitor the prestress under anchorage. When the hydraulic device is installed on the anchor cable, its height and position are limited by chains. Because the anchor cable itself is not rigid and the hydraulic device is relatively heavy, when the hydraulic device tensions the anchor cable, it can easily cause the anchor cable to bend and tilt, leading to misalignment between the hydraulic device, sensors, and anchor cable. This results in the anchor cable bearing bending stress instead of axial tension, affecting the accuracy of the data during prestress monitoring and reducing monitoring efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a monitoring device for prestressed grouting under the anchor of a concrete box girder, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to a monitoring device for prestressed grouting under anchorages of concrete box girders. The device includes a main body and several anchor cables, arranged in multiple groups, each group containing four anchor cables, with the anchor cables arranged at equal intervals. The device also includes:

[0007] The movable mechanism is installed on the side wall of the main body to prevent tilting during the monitoring of anchor cable prestress.

[0008] The auxiliary mechanism is installed on the side wall of the movable mechanism to increase the covering force on the anchor cable during monitoring.

[0009] Furthermore, the main body includes monitoring sensors slidably connected to the outer surface of each set of anchor cables, and the main body also includes:

[0010] The tensioning assembly is installed on the outer surface of the anchor cable and is used to provide tension force to the anchor cable when the monitoring sensor monitors the prestress of the anchor cable.

[0011] Furthermore, the movable mechanism includes a square plate two disposed on the side wall of the tensioning component, and the movable mechanism also includes:

[0012] The sliding component is installed on the side wall of the square plate two to cover multiple anchor cables and maintain the coaxiality of the tensioning component and the anchor cables.

[0013] The push component is installed on the side wall of the sliding component to prevent excessive friction between the anchor cable and the sliding component when the anchor cable is tensioned.

[0014] Furthermore, the auxiliary mechanism includes several curved spring pieces disposed on the two side walls of the square plate, and the auxiliary mechanism also includes:

[0015] The displacement assembly is installed on the side wall of the bending spring to prevent the square plate 2 from tilting during the monitoring of the anchor cable.

[0016] Furthermore, the tensioning assembly includes a hydraulic device slidably connected to the outer surface of each set of anchor cables, with a square plate bolted to the side of the hydraulic device closer to the main body;

[0017] Four connecting springs are fixedly connected to the side of the square plate away from the hydraulic unit.

[0018] A circular groove is provided in the middle of the square plate.

[0019] Furthermore, the second square plate is fixedly connected to the end of the four connecting springs away from the first square plate, and the side wall of the second square plate has several sliding grooves.

[0020] The sliding assembly includes an arc-shaped plate that is slidably connected inside the sliding groove. The side walls of the five arc-shaped plates are slidably connected with ring springs. The side walls of the arc-shaped plates are provided with dovetail grooves, and the ends of the arc-shaped plates are made of elastic material.

[0021] An arc-shaped spring is fixedly connected to the side of the arc-shaped plate closest to the circular groove, and a connecting piece is fixedly connected to the end of the arc-shaped spring away from the arc-shaped plate.

[0022] Furthermore, the actuating component includes a tapered spring disposed between five connecting plates;

[0023] The outer surface of the conical spring is fixedly connected to one of the connecting pieces, and is slidably connected to the other connecting pieces.

[0024] Furthermore, a semicircular ring one is fixedly connected to the end of the conical spring away from the connecting piece, and a semicircular ring two is slidably connected to the bottom of the semicircular ring one;

[0025] An inclined plate is fixedly connected to one side of the semicircular ring near the connecting piece.

[0026] Furthermore, several curved spring pieces are fixedly connected to the side wall of the square plate two;

[0027] The displacement assembly includes a double-ring frame disposed on the side away from the square plate 2 of several curved spring pieces, the inner wall of the double-ring frame being in contact with the side walls of the several curved spring pieces;

[0028] The outer surface of the double-ring frame is provided with four sliding rods, which are arranged at equal angles.

[0029] Furthermore, an inclined plate is fixedly connected to one end of the sliding rod near the square plate two, and the side wall of the inclined plate is in contact with the side wall of the double ring frame;

[0030] An L-shaped frame is slidably connected to the outer surface of the sliding rod, and one end of the L-shaped frame near the second square plate is fixedly connected to the side wall of the second square plate.

[0031] The present invention has the following beneficial effects:

[0032] 1. In this invention, the rotation of the hydraulic device occurs on the guide surface of the semi-circular arc plate, which does not affect the axial transmission of the tension force. The multiple arc plates forming the semi-circular structure form a guide frame between the hydraulic device and the monitoring sensor, maintaining the coaxiality between the hydraulic device, the anchor cable, and the monitoring sensor. This avoids the situation where the three are not aligned, causing the anchor cable to bear bending stress instead of axial tension, thus ensuring the accuracy of the data during the monitoring of the anchor cable prestress and improving the monitoring efficiency.

[0033] 2. The present invention can reduce the large friction between the anchor cable and the arc plate when the dovetail groove is used to reduce the large friction between the anchor cable and the arc plate, thereby reducing the possibility of scratching the anchor cable and affecting the sliding range of the anchor cable during the tensioning process, and improving the smoothness of the anchor cable tensioning process and the monitoring efficiency.

[0034] 3. This invention reduces the impact of the combined squeezing and friction forces generated by the square plate on the surfaces of multiple arc-shaped plates during operation, which can cause the hydraulic device to experience rotational jerking, self-locking, or jamming on the arc-shaped plate surfaces. This ensures that the hydraulic device maintains smooth coaxial rotation during the tensioning of the anchor cable, further improving the accuracy and stability of the monitoring sensor in monitoring the prestress of the anchor cable.

[0035] 4. This invention maintains the stability of the square plate two when it contacts the main body through multiple sliding rods, reduces the shaking of the anchor cable caused by the hydraulic tensioner when it tensions the anchor cable, and ensures the monitoring efficiency of the monitoring sensor when monitoring the anchor cable, thereby further improving the stability of the hydraulic tensioner when it tensions the anchor cable.

[0036] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0039] Figure 2 This is a schematic diagram of the overall partial cross-sectional structure of the present invention;

[0040] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0041] Figure 4 This is a schematic diagram of the tensioning component of the present invention;

[0042] Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle;

[0043] Figure 6 This is a partial structural diagram of the tensioning component of the present invention;

[0044] Figure 7 This is an exploded view of the sliding component of the present invention;

[0045] Figure 8 This is a schematic diagram of the driving component of the present invention.

[0046] The attached diagram lists the components represented by each number as follows:

[0047] In the diagram: 1. Main body; 101. Anchor cable; 102. Monitoring sensor; 11. Tensioning assembly; 111. Hydraulic unit; 112. Square plate one; 113. Connecting spring; 2. Movable mechanism; 201. Square plate two; 21. Sliding assembly; 211. Arc plate; 212. Ring spring; 213. Arc spring piece; 214. Connecting piece; 22. Pushing assembly; 221. Conical spring; 222. Semicircular ring one; 223. Inclined plate; 224. Semicircular ring two; 3. Auxiliary mechanism; 301. Bending spring piece; 31. Displacement assembly; 311. Double ring frame; 312. Sliding rod; 313. L-frame. Detailed Implementation

[0048] 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.

[0049] Please see Figure 1 - Figure 8 As shown, the present invention is a monitoring device for prestressed grouting under the anchorage of a concrete box girder, comprising a main body 1 and several anchor cables 101. The anchor cables 101 are arranged in multiple groups, each group containing four anchor cables 101, and the anchor cables 101 in each group are arranged at equal intervals. The device also includes:

[0050] Movable mechanism 2 is installed on the side wall of the main body 1 to prevent tilting during monitoring of the prestress of anchor cable 101.

[0051] Auxiliary mechanism 3 is installed on the side wall of the movable mechanism 2 to increase the covering force on the anchor cable 101 during the monitoring process.

[0052] The main body 1 includes a monitoring sensor 102 slidably connected to the outer surface of each set of anchor cables 101. The main body 1 also includes:

[0053] Tensioning assembly 11 is installed on the outer surface of anchor cable 101 and is used to provide tension force to anchor cable 101 when monitoring sensor 102 monitors the prestress of anchor cable 101.

[0054] The movable mechanism 2 includes a square plate 201 disposed on the side wall of the tensioning component 11, and the movable mechanism 2 also includes:

[0055] The sliding component 21 is installed on the side wall of the square plate 201 to cover the multiple anchor cables 101 and maintain the coaxiality of the tensioning component 11 and the anchor cables 101.

[0056] The push component 22 is installed on the side wall of the sliding component 21 to prevent excessive friction between the anchor cable 101 and the sliding component 21 when the anchor cable 101 is tensioned.

[0057] The auxiliary mechanism 3 includes several curved spring pieces 301 disposed on the side wall of the square plate 201. The auxiliary mechanism 3 also includes:

[0058] Displacement component 31 is installed on the side wall of bending spring 301 to prevent the square plate 201 from tilting during the monitoring of anchor cable 101.

[0059] The tensioning assembly 11 includes a hydraulic device 111 that is slidably connected to the outer surface of each set of anchor cables 101, and a square plate 112 is bolted to the side of the hydraulic device 111 near the main body 1.

[0060] Four connecting springs 113 are fixedly connected to the side of the square plate 112 away from the hydraulic device 111;

[0061] The square plate 112 has a circular groove in the middle, which is installed between the output end of the hydraulic device 111 and the anchor cable 101 by a wedge to ensure the fixation between the hydraulic device 111 and the anchor cable 101.

[0062] Square plate 201 is fixedly connected to one end of four connecting springs 113 away from square plate 112. Several sliding grooves are provided on the side wall of square plate 201.

[0063] The sliding assembly 21 includes an arc plate 211 slidably connected inside the sliding groove. The side walls of the five arc plates 211 are slidably connected with ring springs 212. The side walls of the arc plates 211 are provided with dovetail grooves, and the ends of the arc plates 211 are made of elastic material.

[0064] An arc-shaped spring piece 213 is fixedly connected to the side of the arc-shaped plate 211 near the circular groove. A connecting piece 214 is fixedly connected to the end of the arc-shaped spring piece 213 away from the arc-shaped plate 211. When multiple arc-shaped plates 211 slide relative to each other, a semi-circular structure will be formed on the surface of each set of anchor cables 101 between the multiple arc-shaped plates 211. When multiple arc-shaped plates 211 form a semi-circular structure, the circular groove on the square plate 112 will interlock with the multiple arc-shaped plates 211 in the semi-circular state.

[0065] The actuating assembly 22 includes a conical spring 221 disposed between five connecting pieces 214;

[0066] The outer surface of the conical spring 221 is fixedly connected to one of the connecting pieces 214 and is slidably connected to the other connecting pieces 214. When the state of the conical spring 221 changes, the conical spring 221 will push the semi-circular ring 1 222 and the semi-circular ring 224 to slide.

[0067] A semi-circular ring 222 is fixedly connected to one end of the conical spring 221 away from the connecting piece 214, and a semi-circular ring 224 is slidably connected to the bottom of the semi-circular ring 222.

[0068] An inclined plate 223 is fixedly connected to the side of the semicircular ring 222 near the connecting piece 214.

[0069] Several curved spring pieces 301 are fixedly connected to the side wall of square plate 201;

[0070] The displacement assembly 31 includes a double ring frame 311 disposed on the side away from the square plate 201 of a plurality of curved spring pieces 301. The inner wall of the double ring frame 311 is in contact with the side wall of the plurality of curved spring pieces 301.

[0071] The outer surface of the double ring frame 311 is provided with four sliding rods 312. The four sliding rods 312 are arranged at equal angles and contact the side walls of the multiple sliding rods 312 through the outermost periphery of the double ring frame 311. At this time, the double ring frame 311 will limit the elastic deformation of the bending spring 301 and maintain the stability of its position.

[0072] An inclined plate is fixedly connected to one end of the sliding rod 312 near the square plate 201, and the side wall of the inclined plate is in contact with the side wall of the double ring frame 311.

[0073] An L-frame 313 is slidably connected to the outer surface of the sliding rod 312. One end of the L-frame 313 near the square plate 201 is fixedly connected to the side wall of the square plate 201. When multiple sliding rods 312 are in contact with the side wall of the main body 1 and the hydraulic device 111 is working, multiple sliding rods 312 are prone to point contact rather than surface contact with the main body 1. When the hydraulic device 111 is working, the square plate 112 and the square plate 201 are prone to shaking due to the unstable contact between the sliding rods 312 and the main body 1.

[0074] In use, firstly, according to requirements, several anchor cables 101 are divided into multiple groups and passed through the interior of the main body 1, with the exposed ends of the main body 1. Then, monitoring sensors 102 are installed on the surface of each group of anchor cables 101. At the same time, hydraulic actuators 111 are passed through the surface of each group of anchor cables 101 and installed between the output end of the hydraulic actuator 111 and the anchor cable 101 using wedges to ensure the fixation between the hydraulic actuator 111 and the anchor cable 101. Then, the hydraulic actuator 111 is started. When the hydraulic actuator 111 is working, it will release power through its output end. Each set of anchor cables 101 is tensioned, and the monitoring sensor 102 monitors the prestress of the anchor cables 101. After the prestress of the anchor cables 101 is tensioned, grouting is performed in the duct between the anchor cables 101 and the main body 1. After the grouting is completed, an acoustic sensor is installed at the other end of the box girder. By tapping the exposed section of the anchor cable 101, the acoustic wave generated after the tapping is received and analyzed by the acoustic sensor to determine the density of the grouting, thus achieving the purpose of monitoring the prestress of the anchor cables 101 and the grouting.

[0075] When the hydraulic unit 111 is working, its body will drive the square plate 201 to slide through the square plate 112 and the connecting spring 113 until the multiple sliding rods 312 contact the side wall of the main body 1. Then, as the hydraulic unit 111 continues to work, the circular groove on the square plate 112 will compress the arc surfaces on the multiple arc plates 211, causing the multiple arc plates 211 to slide relative to each other in the sliding groove, and generating a covering and clamping force on the root area of ​​the anchor cable 101. At this time, the relative sliding of the multiple arc plates 211 will cause the ring spring 212 to contract and accumulate elastic potential energy for reset. When the multiple arc plates 211 slide relative to each other, a semi-circular structure will be formed on the surface of each set of anchor cables 101 between the multiple arc plates 211. When the multiple arc plates 211 form a semi-circular structure... The circular groove on the square plate 112 will interlock with the multiple arc plates 211 in a semi-circular state. When the hydraulic device 111 continues to work, it will rotate along the surface of the arc plate 211 in the semi-circular structure. At this time, the rotation of the hydraulic device 111 occurs on the guide surface of the arc plate 211 in the semi-circular structure, which does not affect the axial transmission of the tension force. The multiple arc plates 211 forming the semi-circular structure form a guide frame between the hydraulic device 111 and the monitoring sensor 102, maintaining the coaxiality between the hydraulic device 111, the anchor cable 101 and the monitoring sensor 102. This can avoid the situation where the three are not aligned, causing the anchor cable 101 to bear bending stress instead of axial tension, ensuring the accuracy of the data during the monitoring of the prestressing process of the anchor cable 101 and improving the monitoring efficiency.

[0076] When multiple arc-shaped plates 211 slide relative to each other within the sliding groove, the sliding of the multiple arc-shaped plates 211 compresses the conical spring 221 through the connecting piece 214. After being compressed, the conical spring 221 changes from a conical state to an approximately cylindrical state. During the state change of the conical spring 221, the conical spring 221 pushes the semi-circular ring 1 222 and the semi-circular ring 224 to slide. At the same time, when the conical spring 221 is compressed, it also compresses the inclined plate 223. After being compressed, the inclined plate 223 drives the semi-circular ring 1 222 to slide downward. When the semi-circular ring 1 222 slides downward, it forms a ring with the semi-circular ring 224 and covers the surface of multiple anchor cables 101 in a group. Then, when the hydraulic device 111 tensions the anchor cable 101, the anchor cable 101 drives the semi-circular ring 1 222 and the semi-circular ring 224 to slide. When the semicircular ring 222 slides, it compresses the conical spring 221. After being compressed, the conical spring 221 exerts an upward pushing force on the connecting piece 214. When the connecting piece 214 is pushed by the conical spring 221, it will drive the arc-shaped spring piece 213 to bend and move upward between the bottom of the arc plate 211 and the surface of the anchor cable 101. At this time, the dovetail groove on the arc plate 211 will contact the surface of the anchor cable 101. The opening of the dovetail groove can reduce the large friction between the arc plate 211 and the anchor cable 101 when it covers the anchor cable 101. This can reduce the situation where the large friction between the anchor cable 101 and the arc plate 211 causes scratches on the anchor cable 101 and affects the sliding amplitude of the anchor cable 101 during the tensioning process, thereby improving the smoothness and monitoring efficiency of the anchor cable 101 during the tensioning process.

[0077] When multiple anchor cables 101 compress the conical spring 221 through semicircular ring 1 222 and semicircular ring 224 during tensioning, the conical spring 221, under compressive force, causes the connecting piece 214 to bend and move obliquely upward. At this time, the connecting piece 214 will drive the arc-shaped spring piece 213 to move synchronously, and cause the outer wall of the arc-shaped spring piece 213 to separate from the inner wall of the arc-shaped plate 211. At this time, the area at the bottom of the arc-shaped plate 211 will be able to undergo elastic changes due to the lack of support from the connecting piece 214 and the arc-shaped spring piece 213. Through the elastic change of the arc-shaped spring piece 213, it can be used in the hydraulic device 11. 1. During operation, ensure the smooth rotation of the hydraulic actuator 111 on the surfaces of multiple arc-shaped plates 211 via the square plate 112. This reduces the impact of the combined effects of the large squeezing and friction forces exerted by the square plate 112 on the surfaces of the multiple arc-shaped plates 211 during operation, which could lead to rotational jerking, self-locking, or jamming of the hydraulic actuator 111 on the surfaces of the arc-shaped plates 211 via the square plate 112. This ensures that the hydraulic actuator 111 maintains smooth coaxial rotation during the tensioning of the anchor cable 101, further improving the accuracy and stability of the monitoring sensor 102 in monitoring the prestress of the anchor cable 101.

[0078] When the conical spring 221 is compressed and changes from a conical state to an approximately cylindrical state, it will also compress the side walls of multiple curved spring pieces 301 through the semicircular ring 222 and the semicircular ring 224 while pushing the semicircular ring 222 to slide. The outermost part of the double-ring frame 311 contacts the side walls of multiple sliding rods 312. At this time, the double-ring frame 311 restricts the elastic deformation of the curved spring pieces 301 and maintains positional stability. Due to the presence of template seams, rough surfaces, and unevenness on the side walls of the main body 1, when multiple sliding rods 312 contact the side walls of the main body 1 and the hydraulic device 111 is working, point contact rather than surface contact may easily occur between the multiple sliding rods 312 and the main body 1. This can easily cause the square plate 112 and the square... The second plate 201 wobbles due to unstable contact between the sliding rod 312 and the main body 1. When the square second plate 201 wobbles, the gap between some of the sliding rods 312 and the square second plate 201 will increase. At this time, the elasticity of the bending spring 301 will push the double ring frame 311 to slide towards the wobbling area. The double ring frame 311 will then be stuck between the sliding rods 312 and the square second plate 201 in the wobbling direction, thereby maintaining the stability of the square second plate 201 when it contacts the main body 1 through multiple sliding rods 312. This reduces the wobbling of the anchor cable 101 when the hydraulic device 111 tensions the anchor cable 101, while ensuring the monitoring efficiency of the monitoring sensor 102 when monitoring the anchor cable 101, and further improving the stability of the anchor cable 101 when the hydraulic device 111 tensions the anchor cable 101.

[0079] It should be noted that when the double ring frame 311 is stuck between the sliding rod 312 and the square plate 201, even if the subsequent anchor cable 101 drives the semi-circular ring 222 to slide, so that the semi-circular ring 222 and the semi-circular ring 224 no longer compress the bending spring 301, the double ring frame 311 will still maintain its position under the compressive force between the sliding rod 312 and the square plate 201.

[0080] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A monitoring device for prestressed grouting under the anchorage of a concrete box girder, comprising a main body (1) and a plurality of anchor cables (101), wherein the anchor cables (101) are arranged in multiple groups, each group containing four anchor cables (101), and the anchor cables (101) in each group are arranged at equal intervals, characterized in that, Also includes: The main body (1) includes a monitoring sensor (102) slidably connected to the outer surface of each set of anchor cables (101), and the main body (1) also includes: Tensioning assembly (11), which is installed on the outer surface of anchor cable (101) and is used to provide tension force to anchor cable (101) when monitoring sensor (102) monitors the prestress of anchor cable (101); The active mechanism (2) is installed on the side wall of the main body (1) to prevent tilting during the monitoring of the prestress of the anchor cable (101). The active mechanism (2) includes a square plate (201) disposed on the side wall of the tensioning component (11). The activity mechanism (2) also includes: The sliding component (21) is installed on the side wall of the square plate (201) to cover multiple anchor cables (101) and maintain the coaxiality of the tensioning component (11) and the anchor cables (101); A pushing component (22) is installed on the side wall of the sliding component (21) to prevent excessive friction between the anchor cable (101) and the sliding component (21) when tensioning the anchor cable (101). Auxiliary mechanism (3) is installed on the side wall of the movable mechanism (2) to increase the covering force on the anchor cable (101) during the monitoring process; The auxiliary mechanism (3) includes a plurality of curved spring pieces (301) disposed on the side wall of the square plate (201), and the auxiliary mechanism (3) further includes: Displacement assembly (31), which is installed on the side wall of the bending spring (301) to prevent the square plate (201) from tilting during the monitoring of the anchor cable (101); The tensioning assembly (11) includes a hydraulic device (111) slidably connected to the outer surface of each set of anchor cables (101), and a square plate (112) is bolted to the side of the hydraulic device (111) near the body (1). Four connecting springs (113) are fixedly connected to the side of the square plate (112) away from the hydraulic device (111). Among them, a circular groove is provided in the middle of the square plate (112); The second square plate (201) is fixedly connected to one end of the four connecting springs (113) away from the first square plate (112), and the side wall of the second square plate (201) is provided with several sliding grooves. The sliding assembly (21) includes an arc plate (211) slidably connected inside the sliding groove. The side walls of the five arc plates (211) are slidably connected with ring springs (212). The side walls of the arc plates (211) are provided with dovetail grooves. The ends of the arc plates (211) are made of elastic material. An arc-shaped spring piece (213) is fixedly connected to the side of the arc plate (211) near the circular groove, and a connecting piece (214) is fixedly connected to the end of the arc-shaped spring piece (213) away from the arc plate (211). The actuating assembly (22) includes a conical spring (221) disposed between the five connecting pieces (214); The outer surface of the conical spring (221) is fixedly connected to one of the connecting pieces (214), and is slidably connected to the other connecting pieces (214).

2. The monitoring device for prestressed grouting under the anchorage of a concrete box girder according to claim 1, characterized in that: The conical spring (221) is fixedly connected to a semi-circular ring one (222) at one end away from the connecting piece (214), and a semi-circular ring two (224) is slidably connected to the bottom of the semi-circular ring one (222). An inclined plate (223) is fixedly connected to the side of the semicircular ring (222) near the connecting piece (214).

3. The monitoring device for prestressed grouting under the anchorage of a concrete box girder according to claim 1, characterized in that: Several of the aforementioned curved spring pieces (301) are fixedly connected to the side wall of the square plate two (201); The displacement assembly (31) includes a double ring frame (311) disposed on the side away from the square plate (201) of a plurality of curved spring pieces (301), the inner wall of the double ring frame (311) being in contact with the side wall of the plurality of curved spring pieces (301). The outer surface of the double ring frame (311) is provided with four sliding rods (312), and the four sliding rods (312) are arranged at equal angles.

4. The prestressed grouting monitoring device under the anchorage of a concrete box girder according to claim 3, characterized in that: An inclined plate is fixedly connected to one end of the sliding rod (312) near the square plate (201), and the side wall of the inclined plate is in contact with the side wall of the double ring frame (311). The outer surface of the sliding rod (312) is slidably connected to an L-frame (313), and the end of the L-frame (313) near the square plate (201) is fixedly connected to the side wall of the square plate (201).

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