Wide bridge prestress loss detection system and method

Abstract

The invention relates to the related technical field of bridge engineering detection, and discloses a wide bridge prestress loss detection system and method, and the system comprises an operation table, the top of the operation table is fixedly provided with a stress sensor, the top of the operation table is fixedly provided with a data acquisition instrument, and the top of the operation table is fixedly provided with a temperature sensor. A circuit box, a displacement sensor and a stretching assembly are fixedly installed at the top of the operation table, a bending assembly is fixedly installed at the top of the stretching assembly, and a supporting assembly is fixedly installed on the outer side of the bending assembly. And a clamping assembly is fixedly mounted at the top of the bending assembly. By adopting the advanced sensing technology, the change of the prestress in the wide bridge can be accurately measured, the loss condition of the prestress can be accurately reflected, the accuracy of a detection result is ensured, the stability and the reliability are good, the detection work is ensured to be smoothly carried out, and the practicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field related to bridge engineering detection, and in particular to a system and method for detecting prestress loss of a wide bridge. Background Art

[0002] Prestressing is the compressive stress pre-applied to the structure during construction in order to improve the service performance of the structure. The pre-applied compressive stress during the service of the structure can fully or partially offset the tensile stress caused by the load and avoid structural damage. Commonly used in concrete structures, prestressed concrete structures are structures that are pre-pressed before they are subjected to loads, so that the internal force of the concrete in the tensile zone under the action of external loads produces compressive stress to offset or reduce the tensile stress caused by the external load, so that the structure does not produce cracks or cracks relatively late under normal use. Therefore, a wide-width bridge prestress loss detection system and method are particularly needed.

[0003] However, the prior art has the following problems: Prestress loss detection methods and equipment in the existing technology With the continuous development of transportation infrastructure, the construction of wide bridges is increasing. During the use of wide bridges, prestress loss is an important factor affecting the safety and durability of bridge structures. The current prestress loss detection methods and equipment have problems such as low accuracy, complex operation, and narrow scope of application. It is difficult to meet the needs of prestress loss detection of wide bridges. Stretching components, bending components, supporting components, and clamping components are not designed, and the bridge structure to be detected cannot be fixed and clamped, and the prestress of the bridge structure cannot be accurately detected. The scope of application is narrow, and the bridge structure cannot be stretched and bent at the same time to test the prestress, resulting in low testing efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a prestress loss detection system and method for a wide bridge in order to solve the above-mentioned problems and overcome the defects of the prior art, as described in detail below.

[0005] To achieve the above object, the present invention provides the following technical solutions: A wide-width bridge prestress loss detection system provided by the present invention comprises: an operating table, a mounting base is fixedly installed at the bottom of the operating table, a universal wheel is arranged at the bottom of the mounting base, a stress sensor is fixedly installed at the top of the operating table, a data acquisition instrument is fixedly installed at the top of the operating table, a temperature sensor is fixedly installed at the top of the operating table, a circuit box is fixedly installed at the top of the operating table, a displacement sensor is fixedly installed at the top of the operating table, a stretching component is fixedly installed at the top of the stretching component, a bending component is fixedly installed at the top of the bending component, a supporting component is fixedly installed on the outside of the bending component, and a clamping component is fixedly installed on the top of the bending component.

[0006] Preferably, the mounting bases and the universal wheels are grouped in pairs, and multiple identical groups are provided, and the multiple groups of mounting bases and universal wheels are equidistantly distributed at the bottom of the operating table.

[0007] Preferably, the stretching assembly includes a work-shaped seat, a support column, a slide rail, a tripod, a motor, a positive and negative double-ended screw, a screw seat, a sliding seat and a mounting groove. The work-shaped seat is fixedly installed on the top of the operating table, the support column is fixedly installed on the bottom inside the work-shaped seat, the slide rail is fixedly installed on the top of the work-shaped seat, the tripod is fixedly installed on the outside of the work-shaped seat, motor 1 is fixedly installed on the top of the tripod, the output end of motor 1 is fixedly installed on the top of the tripod, the screw seat is fixedly installed on the top of the work-shaped seat, the outer side of the positive and negative double-ended screw is threadedly connected to the sliding seat, the top of the sliding seat is provided with a mounting groove, and a plurality of the same support columns are provided, and the plurality of support columns are equidistantly distributed at the bottom inside the work-shaped seat.

[0008] Preferably, the positive and negative double-ended screw is adapted to the sliding seat, the positive and negative double-ended screw is adapted to the screw seat, the slide rail is slidably connected to the sliding seat, and two identical sliding seats are provided, and the two sliding seats are symmetrically distributed about the vertical center line of the positive and negative double-ended screw.

[0009] Preferably, the bending assembly includes a fixed seat, a triangular rack, a bevel gear, a rotating roller, a connecting bearing, a connecting column and a rotating disc. The top of the stretching assembly is fixedly installed with a fixed seat, the top of the fixed seat is fixedly installed with a triangular rack, the outer side of the triangular rack is meshingly connected with a bevel gear, the top of the bevel gear is fixedly installed with a rotating roller, the outer side of the rotating roller is rotatably installed with a connecting bearing, the end of the rotating roller away from the bevel gear is fixedly installed with a connecting column, the top of the connecting column is fixedly installed with a rotating disc, the triangular rack is adapted to the bevel gear, and the bending assembly is provided with two identical groups, and the two groups of the bending assemblies are symmetrically distributed about the vertical center line of the positive and negative double-head screw.

[0010] Preferably, the support assembly includes a support base, a cylinder, a telescopic rod, a support block, a connecting block, a protective cover and a bearing connecting plate. The support base is fixedly installed on the top of the operating table, the cylinder is fixedly installed on the top of the support base, the telescopic rod is fixedly installed on the movable end of the cylinder, the support block is fixedly installed on the end of the telescopic rod away from the cylinder, the outer side of the support block is connected to the connecting block by bolts and screws, the outer side of the connecting block is fixedly installed with a protective cover, and the top of the protective cover is fixedly installed with a bearing connecting plate, the connecting block, protective cover and bearing connecting plate are provided in two identical groups, and the two groups of connecting blocks, protective covers and bearing connecting plates are symmetrically distributed about the vertical center line of the support block.

[0011] Preferably, the protective cover does not contact the bevel gear and the rotating roller, and the bearing connecting plate is fixedly connected to the connecting bearing.

[0012] Preferably, the clamping assembly includes a mounting base, a support seat, an electric cylinder, an electric push rod, a connecting block, a clamping head, a limit block and a limit groove; the mounting base is fixedly installed on the top of the bending assembly, the support seat is fixedly installed on the top of the mounting base, the electric cylinder is fixedly installed on the top of the support seat, the electric push rod is fixedly installed on the movable end of the electric cylinder, the connecting block is fixedly installed on the end of the electric push rod away from the electric cylinder, the clamping head is fixedly installed on the outside of the connecting block, the limit block is fixedly installed on the top of the mounting base, the limit groove is provided on the top of the limit block, the vertical section of the clamping head is a "U"-shaped structure, the outer side of the clamping head is made of silicone or rubber material, and the outer side of the limit block is made of silicone or rubber material.

[0013] Preferably, the clamping assembly is provided with two identical groups, and the two groups of the clamping assemblies are symmetrically distributed about the vertical center line of the positive and negative double-ended screw rod, the electric cylinder, electric push rod, connecting block and clamping head are provided with two identical groups, and the two groups of the electric cylinder, electric push rod, connecting block and clamping head are symmetrically distributed about the vertical center line of the mounting base plate, and the limit blocks and limit grooves are provided with two identical groups, and the two groups of the limit blocks and limit grooves are symmetrically distributed about the vertical center line of the mounting base plate.

[0014] A method for detecting prestress loss of a wide bridge comprises the following steps: Step 1: Start all sensors stress sensors, data acquisition instruments, temperature sensors, circuit boxes and displacement sensors; Step 2: Place the bridge structure to be inspected into the limit groove according to its size, and start the electric cylinder on the clamping assembly to drive the clamping head to fix and clamp the bridge structure to be inspected; Step 3: Start the motor to drive the positive and negative double-ended screw to rotate, thereby driving the two sets of sliding seats to move in opposite directions on the slide rails, thereby stretching the bridge structure to be inspected. At the same time, the movement of the sliding seat drives the triangular rack above it to move, causing the rotating disc to rotate, thereby bending the bridge structure to be inspected; Step 4: Record the values ​​of the two groups at this time, repeat this operation several times, count the data during all operations, and obtain the ultimate prestress value from the sensor; Step 5: After the inspection is completed, turn off the motor slightly to restore the entire device to its original state, turn off the electric cylinder, remove the inspected object, and clean and maintain the entire device.

[0015] The beneficial effects are: This wide-span bridge prestress loss detection system and method, by adopting advanced sensing technology, can accurately measure the changes in prestress in wide-span bridges and accurately reflect the prestress loss situation. Compared with traditional detection methods, the detection accuracy is greatly improved, providing reliable data support for bridge safety assessment, and can perform targeted detection of prestress in different parts, avoiding detection errors caused by the large width of the bridge.

[0016] The system and method for detecting loss of prestress on wide-width bridges can detect prestress in two directions at the same time by setting up stretching components and bending components, and only one power supply needs to be started. The linkage between components is stronger, ensuring the accuracy of the detection results. The operation is simple and convenient, and professional technicians do not need to undergo complex operation training before use. The efficiency of the detection work is greatly improved, and manpower and time costs are saved. The system and method have a real-time monitoring function, and can continuously monitor the changes in prestress on wide-width bridges. Once the prestress loss is found to exceed a safe range, an early warning signal is immediately issued to remind relevant personnel to take timely measures to prevent safety accidents on the bridge.

[0017] The system and method for detecting prestress loss on wide-span bridges are applicable to various types of wide-span bridges, including concrete bridges, steel box girder bridges, etc., through the setting of clamping components. They can play an important role in the detection and evaluation of new bridges or existing bridges, have good stability and reliability, and ensure the smooth progress of the detection work. At the same time, while ensuring the detection accuracy, they reduce the cost of bridge detection, have high cost performance, and are highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a schematic diagram of the structure of some sensors of the present invention; Figure 4 It is a schematic diagram of the structure of the component assembly of the present invention; Figure 5 This is a schematic diagram of the structure of the stretching assembly of the present invention; Figure 6This is a schematic diagram of the split structure of the bending assembly of the present invention; Figure 7 This is a schematic diagram of the support assembly structure of the present invention; Figure 8 It is a schematic diagram of the structure of the clamping assembly of the present invention.

[0020] The accompanying drawings are described as follows: 1. operating table; 2. mounting base; 3. universal wheel; 4. stress sensor; 5. data acquisition instrument; 6. temperature sensor; 7. circuit box; 8. displacement sensor; 9. stretching assembly; 901. work seat; 902. support column; 903. slide rail; 904. tripod; 905. motor; 906. positive and negative double-headed screw; 907. screw seat; 908. sliding seat; 909. mounting groove; 10. bending assembly; 1001. fixing seat; 1002. triangular rack; 1003. bevel gear; 1004. Rotating roller; 1005, connecting bearing; 1006, connecting column; 1007, rotating disc; 11, supporting assembly; 1101, supporting base; 1102, cylinder; 1103, telescopic rod; 1104, supporting block; 1105, connecting block; 1106, protective cover; 1107, bearing connecting plate; 12, clamping assembly; 1201, mounting base; 1202, supporting seat; 1203, electric cylinder; 1204, electric push rod; 1205, connecting block; 1206, clamping head; 1207, limit block; 1208, limit groove. DETAILED DESCRIPTION

[0021] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. Example 1

[0022] See also Figure 1 - Figure 4A prestress loss detection system for a wide bridge comprises: an operating platform 1, a mounting base 2 is fixedly installed at the bottom of the operating platform 1, a universal wheel 3 is arranged at the bottom of the mounting base 2, a stress sensor 4 is fixedly installed at the top of the operating platform 1, a data acquisition instrument 5 is fixedly installed at the top of the operating platform 1, a temperature sensor 6 is fixedly installed at the top of the operating platform 1, a circuit box 7 is fixedly installed at the top of the operating platform 1, a displacement sensor 8 is fixedly installed at the top of the operating platform 1, a stretching component 9 is fixedly installed at the top of the stretching component 9, a bending component 10 is fixedly installed at the top of the stretching component 9, a supporting component 11 is fixedly installed on the outside of the bending component 10, and a clamping component 12 is fixedly installed on the top of the bending component 10, and multiple groups of the mounting base 2 and the universal wheel 3 are arranged in pairs, and multiple groups of mounting bases 2 and universal wheels 3 are equidistantly distributed at the bottom of the operating platform 1. By setting multiple groups of mounting bases 2 and universal wheels 3, the whole device can be moved more conveniently, thereby avoiding detection errors caused by the large width of the bridge and ensuring the accuracy of the detection results.

[0023] For further information, see Figure 5 - Figure 6The stretching assembly 9 includes a work-shaped seat 901, a support column 902, a slide rail 903, a tripod 904, a motor 905, a positive and negative double-headed screw 906, a screw seat 907, a sliding seat 908 and a mounting groove 909. The work-shaped seat 901 is fixedly installed on the top of the operating table 1, and the support column 902 is fixedly installed on the bottom of the work-shaped seat 901. The slide rail 903 is fixedly installed on the top of the work-shaped seat 901, and the tripod 904 is fixedly installed on the outside of the work-shaped seat 901. The motor 1 905 is fixedly installed on the top of the tripod 904, and the output end of the motor 1 905 is fixedly installed with a positive and negative double-headed screw 906, and the screw seat 907 is fixedly installed on the top of the work-shaped seat 901. The outer side of the positive and negative double-headed screw 906 is threadedly connected with a sliding seat 908, and a mounting groove 909 is opened on the top of the sliding seat 908. The support column 902 is provided with multiple identical support columns, and the multiple support columns 902 are equidistantly distributed on the top. The bottom of the working seat 901 is provided with a stretching component 9, which can detect the prestress of the horizontal force of the bridge structure, test the maximum value of the bridge structure, and prevent safety accidents in the bridge. It is suitable for various types of wide bridges. The positive and negative double-headed screw rod 906 is adapted to the sliding seat 908, and the positive and negative double-headed screw rod 906 is adapted to the screw rod seat 907. The slide rail 903 and the sliding seat 908 are slidingly connected. Through the cooperation between the positive and negative double-headed screw rod 906 and the sliding seat 908, the overall operation is more stable, which ensures the accuracy of the test results. The sliding seat 908 is provided with two identical ones, and the two sliding seats 908 are symmetrically distributed about the vertical center line of the positive and negative double-headed screw rod 906. By setting up multiple groups of sliding seats 908, the overall operation is more stable, which ensures the accuracy of the test results. It has good stability and reliability, which ensures the smooth progress of the detection work.

[0024] Further, see Figure 7 - Figure 8The bending assembly 10 includes a fixed seat 1001, a triangular rack 1002, a bevel gear 1003, a rotating roller 1004, a connecting bearing 1005, a connecting column 1006 and a rotating disk 1007. The top of the stretching assembly 9 is fixedly installed with a fixed seat 1001, the top of the fixed seat 1001 is fixedly installed with a triangular rack 1002, the outer side of the triangular rack 1002 is meshed and connected with a bevel gear 1003, the top of the bevel gear 1003 is fixedly installed with a rotating roller 1004, the outer side of the rotating roller 1004 is rotatably installed with a connecting bearing 1005, the end of the rotating roller 1004 away from the bevel gear 1003 is fixedly installed with a connecting column 1006, the top of the connecting column 1006 is fixedly installed with a rotating disk 1007, the triangular rack 1 002 is adapted to the bevel gear 1003, and the bending assembly 10 is provided with two identical groups, and the two groups of bending assemblies 10 are symmetrically distributed about the vertical center line of the positive and negative double-ended screw rod 906. By setting the bending assembly 10, the maximum value of the bending prestress of the bridge structure can be tested, and the detection result is more accurate, and the error of the detection result is reduced. By setting two identical groups of bending assemblies 10, the process of bending the bridge structure is more stable, ensuring the accuracy of the detection result, and being able to accurately measure the change of prestress in a wide bridge, accurately reflecting the loss of prestress. The support assembly 11 includes a support base 1101, a cylinder 1102, a telescopic rod 1103, a support block 1104, a connecting block 1105, and a protective cover 1 106 and a bearing connecting plate 1107, a support base 1101 is fixedly installed on the top of the operating table 1, a cylinder 1102 is fixedly installed on the top of the support base 1101, a telescopic rod 1103 is fixedly installed on the movable end of the cylinder 1102, a support block 1104 is fixedly installed on the end of the telescopic rod 1103 away from the cylinder 1102, a connecting block 1105 is connected to the outer side of the support block 1104 by bolts and screws, a protective cover 1106 is fixedly installed on the outer side of the connecting block 1105, a bearing connecting plate 1107 is fixedly installed on the top of the protective cover 1106, the connecting block 1105, the protective cover 1106 and the bearing connecting plate 1107 are provided in two identical groups, and the two groups of connecting blocks 1105, protective covers 1106 and bearing connecting plates 1107 are provided in two identical groups. 107 is symmetrically distributed about the vertical center line of the support block 1104. By setting up the support assembly 11, the process of bending the bridge structure is more stable, ensuring the accuracy of the detection result, and can accurately measure the change of prestress in the wide bridge, and accurately reflect the loss of prestress. The protective cover 1106 and the bevel gear 1003 and the rotating roller 1004 are not in contact with each other. The bearing connecting plate 1107 and the connecting bearing 1005 are fixedly connected. By setting up the bearing connecting plate 1107 and the connecting bearing 1005 as a fixed connection, the bridge structure to be detected is fixed, and the prestress detection of the bridge structure is more convenient. The change of prestress in the wide bridge can be accurately measured, and the loss of prestress can be accurately reflected.The clamping assembly 12 includes a mounting base 1201, a support seat 1202, an electric cylinder 1203, an electric push rod 1204, a connecting block 1205, a clamping head 1206, a limit block 1207 and a limit groove 1208. The top of the bending assembly 10 is fixedly mounted with the mounting base 1201, the top of the mounting base 1201 is fixedly mounted with the support seat 1202, the top of the support seat 1202 is fixedly mounted with the electric cylinder 1203, the movable end of the electric cylinder 1203 is fixedly mounted with the electric push rod 1204, and the end of the electric push rod 1204 away from the electric cylinder 1203 is fixedly mounted with A connecting block 1205 is provided, and a clamping head 1206 is fixedly installed on the outer side of the connecting block 1205. A limiting block 1207 is fixedly installed on the top of the mounting base plate 1201. A limiting groove 1208 is provided on the top of the limiting block 1207. The vertical section of the clamping head 1206 is in a "U"-shaped structure. The outer side of the clamping head 1206 is made of silicone or rubber material, and the outer side of the limiting block 1207 is made of silicone or rubber material. By setting two sets of clamping components 12, the clamping components 12 are more stably fixed to the bridge structure, which facilitates further detection of the bridge structure and improves the detection result. The accuracy makes the bending process of the bridge structure more stable, ensures the accuracy of the detection results, can accurately measure the changes in prestress in wide bridges, and accurately reflect the loss of prestress. The clamping assembly 12 is provided with two identical groups, and the two groups of clamping assemblies 12 are symmetrically distributed about the vertical center line of the positive and negative double-headed screw rod 906. The electric cylinder 1203, the electric push rod 1204, the connecting block 1205 and the clamping head 1206 are provided with two identical groups, and the two groups of electric cylinders 1203, the electric push rod 1204, the connecting block 1205 and the clamping head 1206 are symmetrically distributed about the vertical center line of the positive and negative double-headed screw rod 906. The vertical center line of the base plate 1201 is symmetrically distributed, and two identical groups of limit blocks 1207 and limit grooves 1208 are provided. The two groups of limit blocks 1207 and limit grooves 1208 are symmetrically distributed about the vertical center line of the mounting base plate 1201. By providing two identical groups of mounting base plates 1201, support seats 1202, electric cylinders 1203, electric push rods 1204, connecting blocks 1205 and clamping heads 1206, the clamping assembly 12 is more stable in fixing the bridge structure, which facilitates further detection of the bridge structure, improves the accuracy of the detection results, and has high practicality. Example 2

[0025] A method for detecting loss of prestress on a wide bridge adopts a method for detecting loss of prestress on a wide bridge in Embodiment 1, and further comprises the following steps: Step 1: Start all sensors stress sensor 4, data acquisition instrument 5, temperature sensor 6, circuit box 7 and displacement sensor 8; Step 2: Place the bridge structure to be inspected into the limit groove 1208 according to its size, and start the electric cylinder 1203 on the clamping assembly 12 to drive the clamping head 1206 to fix and clamp the bridge structure to be inspected; Step 3: Start the motor 905 to drive the positive and negative double-ended screw 906 to rotate, thereby driving the two sets of sliding seats 908 to move in opposite directions on the slide rail 903, thereby stretching the bridge structure to be inspected. At the same time, the sliding seat 908 moves, driving the triangular rack 1002 above it to move, so that the rotating disk 1007 rotates, thereby bending the bridge structure to be inspected; Step 4: Record the values ​​of the two groups at this time, repeat this operation several times, count the data during all operations, and obtain the ultimate prestress value from the sensor; Step 5: After the detection is completed, the motor 905 is slightly turned off to restore the entire device to its original state, and the electric cylinder 1203 is turned off, the object after the detection is removed, and the entire device is cleaned and maintained.

[0026] With the above structure, the working principle of this case is: when in use, the staff installs multiple groups of mounting bases 2 and universal wheels 3 at the bottom of the operating table 1, and then the staff opens all the sensors, stress sensors 4, data acquisition instruments 5, temperature sensors 6, circuit boxes 7 and displacement sensors 8 in sequence, and then the staff places the bridge structure to be detected in the limit groove 1208 at the top of the limit block 1207. At this time, the staff starts all the electric cylinders 1203, driving the electric push rods 1204 to move, thereby driving multiple groups of clamping heads 1206 to move closer, so that the clamping heads 1206 contact with the bridge structure to be detected, thereby clamping and fixing them. At this time, the staff starts the motor 905 again, driving the positive and negative double-headed screw rods 906 to rotate, thereby driving the two groups of sliding seats 908 to move in opposite directions on the slide rails 903, and then stretching the bridge structure to be detected. When stretched to the critical point of the bridge structure, the staff records the prestress of the wide bridge structure. At this time, due to the movement of the sliding seat 908, it drives its The triangular rack 1002 at the top moves. At this time, because the triangular rack 1002 is meshed with the bevel gear 1003, the bevel gear 1003 is driven to rotate. Under the action of the connecting bearing 1005, the rotating disk 1007 is rotated. At this time, the staff can adjust the height of the cylinder 1102 according to the height required for the test on site. At the same time, because the bearing connecting plate 1107 and the connecting bearing 1005 are fixedly connected, the bending component 10 is fixed more stably, and the prestressed stress test is further performed on the bridge structure to be tested. When the critical value of the bending is reached, the staff records the value at this time. At this time, the staff only needs to start a motor 905 to simultaneously test the stretching and bending of the bridge structure to be tested, which is more convenient and has stronger linkage. At this time, the staff will repeat the above operation many times and record multiple sets of data to ensure the accuracy of the data. At this time, the operation is completed, and the staff only needs to reverse the above process to restore the entire device. The operation is simple and convenient, and the practicality is high.

[0027] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A wide bridge prestress loss detection system, characterized in that: include: An operating table (1), wherein a mounting base (2) is fixedly mounted on the bottom of the operating table (1), a universal wheel (3) is arranged at the bottom of the mounting base (2), a stress sensor (4) is fixedly mounted on the top of the operating table (1), a data acquisition instrument (5) is fixedly mounted on the top of the operating table (1), a temperature sensor (6) is fixedly mounted on the top of the operating table (1), a circuit box (7) is fixedly mounted on the top of the operating table (1), a displacement sensor (8) is fixedly mounted on the top of the operating table (1), a stretching assembly (9) is fixedly mounted on the top of the stretching assembly (9), a supporting assembly (11) is fixedly mounted on the outer side of the bending assembly (10), and a clamping assembly (12) is fixedly mounted on the top of the bending assembly (10).

2. A wide bridge prestress loss detection system according to claim 1, characterized in that: The mounting bases (2) and universal wheels (3) are arranged in pairs, and multiple identical groups are provided. The multiple groups of mounting bases (2) and universal wheels (3) are equidistantly distributed at the bottom of the operating table (1).

3. A wide bridge prestress loss detection system according to claim 1, characterized in that: The stretching assembly (9) comprises a work-shaped seat (901), a support column (902), a slide rail (903), a tripod (904), a motor (905), a positive and negative double-ended screw (906), a screw seat (907), a slide seat (908) and a mounting groove (909); the work-shaped seat (901) is fixedly mounted on the top of the operating table (1); the support column (902) is fixedly mounted on the bottom of the work-shaped seat (901); the slide rail (903) is fixedly mounted on the top of the work-shaped seat (901); and the tripod is fixedly mounted on the outside of the work-shaped seat (901). (904), a motor (905) is fixedly mounted on the top of the tripod (904), a positive and negative double-ended screw (906) is fixedly mounted on the output end of the motor (905), a screw seat (907) is fixedly mounted on the top of the work-shaped seat (901), the outer side of the positive and negative double-ended screw (906) is threadedly connected to a sliding seat (908), a mounting groove (909) is provided on the top of the sliding seat (908), and a plurality of the same support columns (902) are provided, and the plurality of support columns (902) are equidistantly distributed at the bottom of the work-shaped seat (901).

4. A wide bridge prestress loss detection system according to claim 3, characterized in that: The positive and negative double-ended screw (906) is matched with the sliding seat (908), and the positive and negative double-ended screw (906) is matched with the screw seat (907). The slide rail (903) and the sliding seat (908) are slidably connected. The sliding seat (908) is provided with two identical ones, and the two sliding seats (908) are symmetrically distributed about the vertical center line of the positive and negative double-ended screw (906).

5. A wide bridge prestress loss detection system according to claim 1, characterized in that: The bending component (10) comprises a fixed seat (1001), a triangular rack (1002), a bevel gear (1003), a rotating roller (1004), a connecting bearing (1005), a connecting column (1006) and a rotating disk (1007); the top of the stretching component (9) is fixedly mounted with the fixed seat (1001); the top of the fixed seat (1001) is fixedly mounted with the triangular rack (1002); the outer side of the triangular rack (1002) is meshedly connected with the bevel gear (1003); the top of the bevel gear (1003) is fixedly mounted with the rotating roller (1004). A movable roller (1004) is provided, wherein a connecting bearing (1005) is rotatably mounted on the outer side of the rotating roller (1004), a connecting column (1006) is fixedly mounted on one end of the rotating roller (1004) away from the bevel gear (1003), a rotating disc (1007) is fixedly mounted on the top of the connecting column (1006), the triangular rack (1002) is adapted to the bevel gear (1003), and the bending assembly (10) is provided with two identical groups, and the two groups of the bending assembly (10) are symmetrically distributed about the vertical center line of the positive and negative double-ended screw rod (906).

6. A wide bridge prestress loss detection system according to claim 1, characterized in that: The support assembly (11) comprises a support base (1101), a cylinder (1102), a telescopic rod (1103), a support block (1104), a connecting block (1105), a protective cover (1106) and a bearing connecting plate (1107); the support base (1101) is fixedly mounted on the top of the operating table (1); the cylinder (1102) is fixedly mounted on the top of the support base (1101); the telescopic rod (1103) is fixedly mounted on the movable end of the cylinder (1102); and the end of the telescopic rod (1103) away from the cylinder (1102) is fixedly mounted with a support A support block (1104) is provided, the outer side of the support block (1104) is connected to a connecting block (1105) via bolts and screws, a protective cover (1106) is fixedly installed on the outer side of the connecting block (1105), a bearing connecting plate (1107) is fixedly installed on the top of the protective cover (1106), and two identical groups of the connecting block (1105), the protective cover (1106) and the bearing connecting plate (1107) are provided, and the two groups of the connecting blocks (1105), the protective cover (1106) and the bearing connecting plate (1107) are symmetrically distributed about the vertical center line of the support block (1104).

7. A wide bridge prestress loss detection system according to claim 6, characterized in that: The protective cover (1106) is not in contact with the bevel gear (1003) or the rotating roller (1004), and the bearing connecting plate (1107) is fixedly connected to the connecting bearing (1005).

8. The wide bridge prestress loss detection system according to claim 1 is characterized by: The clamping assembly (12) comprises a mounting base plate (1201), a support seat (1202), an electric cylinder (1203), an electric push rod (1204), a connecting block (1205), a clamping head (1206), a limit block (1207) and a limit groove (1208); the mounting base plate (1201) is fixedly mounted on the top of the bending assembly (10); the support seat (1202) is fixedly mounted on the top of the mounting base plate (1201); the electric cylinder (1203) is fixedly mounted on the top of the support seat (1202); and the electric push rod is fixedly mounted on the movable end of the electric cylinder (1203). (1204), a connecting block (1205) is fixedly installed at one end of the electric push rod (1204) away from the electric cylinder (1203), a clamping head (1206) is fixedly installed on the outer side of the connecting block (1205), a limiting block (1207) is fixedly installed on the top of the mounting base plate (1201), a limiting groove (1208) is provided on the top of the limiting block (1207), the vertical section of the clamping head (1206) is a "U"-shaped structure, the outer side of the clamping head (1206) is made of silicone or rubber material, and the outer side of the limiting block (1207) is made of silicone or rubber material.

9. A wide bridge prestress loss detection system according to claim 8, characterized in that: The clamping assembly (12) is provided with two identical groups, and the two groups of the clamping assembly (12) are symmetrically distributed about the vertical center line of the positive and negative double-headed screw (906); the electric cylinder (1203), the electric push rod (1204), the connecting block (1205) and the clamping head (1206) are provided with two identical groups, and the two groups of the electric cylinder (1203), the electric push rod (1204), the connecting block (1205) and the clamping head (1206) are symmetrically distributed about the vertical center line of the mounting base plate (1201); the limit blocks (1207) and the limit grooves (1208) are provided with two identical groups, and the two groups of the limit blocks (1207) and the limit grooves (1208) are symmetrically distributed about the vertical center line of the mounting base plate (1201).

10. A method for detecting prestress loss in a wide bridge, characterized by: A wide bridge prestress loss detection system according to any one of claims 1 to 9 further includes the following steps: Step 1: Start all sensors including stress sensor (4), data acquisition instrument (5), temperature sensor (6), circuit box (7) and displacement sensor (8); Step 2: placing the bridge structure to be inspected into the limiting groove (1208) according to its size, and starting the electric cylinder (1203) on the clamping assembly (12) to drive the clamping head (1206) to fix and clamp the bridge structure to be inspected; Step 3: Start the motor (905) to drive the positive and negative double-ended screw (906) to rotate, thereby driving the two sets of sliding seats (908) to move in opposite directions on the slide rail (903), thereby stretching the bridge structure to be inspected. At the same time, the sliding seat (908) moves, driving the triangular rack (1002) above it to move, causing the rotating disk (1007) to rotate, thereby bending the bridge structure to be inspected; Step 4: Record the values ​​of the two groups at this time, repeat this operation several times, count the data during all operations, and obtain the ultimate prestress value from the sensor; Step 5: After the detection is completed, the motor (905) is slightly turned off to restore the entire device to its original state, and the electric cylinder (1203) is turned off, the object that has been detected is removed, and the entire device is cleaned and maintained.

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